WO2024044831A1 - Fuel sensor and sensing method - Google Patents
Fuel sensor and sensing method Download PDFInfo
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- WO2024044831A1 WO2024044831A1 PCT/BR2023/050291 BR2023050291W WO2024044831A1 WO 2024044831 A1 WO2024044831 A1 WO 2024044831A1 BR 2023050291 W BR2023050291 W BR 2023050291W WO 2024044831 A1 WO2024044831 A1 WO 2024044831A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
Definitions
- the present invention relates to a fuel sensor, such as a sensor designed to identify the percentage of mixture between two fuels.
- variable fuel mixtures that is, the percentage of each individual fuel in the mixture, with the driver's free choice, varies depending on the vehicle's supply as well as entails management issues that will in addition to the usual MCI control depending on the vehicle's current driving conditions.
- the ECU electronic engine management center determines the amount of fuel through the injection time depending on the traditional variables (intake air flow, temperature, engine speed, etc.), but also depending on the characteristics of the fuel (or mixture of fuels) that will be burned or, in practical terms, the A/F ratio (air/fuel ratio) determined by the respective percentages of individual fuels that make up the fuel mixture in use.
- Group 1 - calculated based on the characteristics of the gases generated when burning the fuel.
- the result of combustion of a given mass of fuel formed by an unknown mixture is monitored depending on the result obtained (composition of exhaust gases through the oxygen probe, torque, etc.) and the A/F value accordingly. adjusted to obtain optimal fuel burning.
- the main disadvantages of these methods are the time required to obtain the exact value of the A/F ratio for the mixture being burned, in terms of engine cycle, as well as and mainly in the constant processing of this data, consuming part of the finite capacity. of ECU processing, these factors are added to the criticalities imposed by the increase in combustion pressure in supercharged engines with direct injection into the combustion chamber (Dl - direct injection).
- Group 2 through the use of fuel sensors, generally arranged in the fuel supply line, between the fuel tank and the injector supply gallery, and which can eliminate the need for any type of complementary processing to obtain the ratio A/F since the value, analog or digital, provided by the sensor indicates the composition of the fuel, this composition is directly linked to a precise A/F value.
- the percentage composition of the fuel is determined by measuring the capacitance, despite there being publications relating to other ways/properties to obtain the percentage composition of the fuel.
- Another function of said fuel sensor is to determine, for example through capacitance, the percentage of water in the mixture, which compromises the useful life of the injection system components.
- fuel sensors are also not free from drawbacks. Among these, it is possible to mention the production cost and reading accuracy as the most relevant obstacles to the massive use of this line of technical solution.
- Document US 10018613 teaches a sensing device based on a resonant LCR circuit.
- An electrical stimulus is applied to the fluid under analysis, via electrodes, while the return signal is analyzed by processors in order to determine the composition of the fluid.
- processors in order to determine the composition of the fluid.
- at least one processor is used to determine the percentage of water in the fluid based on processing the resonant impedance spectral response.
- this device is able to determine, via processing, the percentage of water (among others) in a fluid, it can present risks if the mixture is not inert, since an electric current must pass through the liquid.
- Document US 5150683 teaches a method and a sensor for determining the respective percentages of a mixture between two fluids having substantially different dielectric properties, such as mixtures between gasoline and alcohol or fuel oil and water.
- An inductive winding is immersed in the mixture and thus presents a capacitance which is directly proportional to the dielectric constant of the mixture that surrounds the winding and which, in turn, is directly proportional to the percentage of each fluid in the mixture.
- the winding turns act as equivalent to electrodes, thus generating a capacitance between each turn.
- a circuit converts the signal into frequency (generated by an amplifier that oscillates at the resonant frequency of the winding's LC circuit) and sends it to the motor control, in order to make the necessary adjustments in the ignition timing.
- Document JPH 0443835 teaches an alcohol sensor in a combustible mixture in which the temperature of the mixture and the amount of water in the mixture are taken into account so that a more accurate alcohol quantification can be obtained, these parameters being used to compensate for the percentage of alcohol detected by a fuel sensor.
- the changes in oscillation frequency are analyzed due to the percentage of alcohol and the temperature of the mixture, among others through the electrostatic capacity of the mixture that passes through two electrodes of the sensor.
- the alcohol percentage compensation is carried out using a table inserted in the computing means.
- a first objective of the invention is a sensor device for detecting the percentage of a mixture of fuels in flow, capable of overcoming the drawbacks of the art.
- Another objective of the present invention is a fuel sensor, capable of determining the percentage of ethanol in a fuel mixture comprising ethanol and gasoline.
- FIG. 1 is a perspective view of a fuel sensor, according to the invention.
- FIG. 2 is a sectional view of the fuel sensor according to section II-II of figure 1;
- FIG. 3 is a schematic perspective view illustrating the electrical connections of the cover (external tube) and the measuring tube (internal tube) through the respective contact pins;
- FIG. 4 is a cross-sectional view of the sensor tubes according to section IV-IV of Figure 3;
- FIGS. 6A and 6B are bottom and exploded views of the fuel sensor, illustrating two stages of assembly of the sensor's component parts.
- 1 indicates, as a whole, a fuel sensor, according to the present invention.
- the fuel sensor also designable as an ethanol sensor, is basically defined by a parallelepiped box 2, internally empty and which defines a seat 9 capable of receiving a circuit board, or PCB 8, which receives the connections with the sensing element. 10, with connector 6, in addition to carrying the electronic components intended to process the signals received from the sensor element and send a processed signal, via connector 6, to the ECU (not illustrated) of a vehicle (not illustrated).
- tabs 3 are provided, integral in relation to said box, for fixing it on an appropriate substrate of the vehicle, for example on the chassis, or alternatively on the MCI.
- an oblong bushing 19 is inserted into each of the through holes of the flaps 3, each of which is preferably arranged at 90° to the other.
- connection terminals 4, 5 project from the upper sides, one opposite the other, and intended to be respectively coupled to a tube (not illustrated) coming from the fuel tank and the tube (not illustrated) directed to the fuel gallery that feeds the MCI. More specifically, from the lower portion of the box 2 (see in particular figure 5) a cylindrical support 14 is provided, integral with said box, and capable of keeping said sensor element 10 fixed internally. of the cylindrical support 14 defines the input terminal 4 for the tube coming from the fuel tank.
- Said sensor element 10 is fixed inside the cylindrical support 14 mechanically and hydraulically isolated in relation to the interior of the box 2.
- Said sensor element 10, as illustrated in figures 3 and 4 is defined by an external cover 11 and which receives, concentrically, an internal tube 12.
- the fuel coming from the input terminal 4 passes through the sensing element 10 through the cylindrical region externally delimited by the cap I and internally delimited by the tube 12.
- the external cap 11 projects beyond the cylindrical support 14 and defines the output terminal 5, capable of be coupled by said fuel gallery supply pipe.
- the relative fixation between the cover II and the tube 12 is carried out in the central region of the sensing element 10, through a lock 13 in cooperation with contact pins 15, 16, which will be described later.
- An NTC type temperature sensor 17 is also provided (see figure 5), capable of determining the temperature of the combustible mixture in the region of the sensing element 10 in which the physical characteristics of the combustible mixture are collected.
- the cover 1 and the tube 12 have respective electrical contact pins 16, 15 of the tube and cover with the PCB board 8.
- Each of said contact pins 15, 16 has a specific shape and is capable of being connected, for example, by soldering, to the PCB 8. More in particular, each of the contact pins has a cylindrical body with an upper projection 15', 16', with a reduced diameter, suitable for penetrate the PCB 8 and be soldered to it, in addition to being mechanically and electrically connected underneath, with the respective cover 11 and tube 12.
- said contact pins 15, 16 are electrically isolated from each other by the insulating material used to make the box 2 , between others.
- each of the contact pins 15, 16 is carried out by respective sealing rings 18, or O-rings, which surround the cylindrical body of each of the contact pins, thus preventing the fuel from flowing through the inside the sensor element enters seat 9 of box 2, as shown in figure 2.
- Said PCB board 8 presents a conformation preferably cooperative with said seat 9 defined inside the box 2 and also includes processing components, such as a microprocessor, or similar, capable of receiving signals from the physical characteristics measured by the sensing element, as well as the temperature reading provided by the temperature sensor. NTC temperature 17, in addition to other discrete components.
- the discrete components installed on the PCB 8 define an RC circuit which acts in parallel with the sensing element 10, in order to excite/power the sensing element 10, as well as recover voltage measurements originating from the sensing element 10 immersed in the fuel flow, according to a technique known in the art.
- the microprocessor may be a general purpose processor, or a dedicated processing unit programmed to perform the functions predetermined by the actuation method of the fuel sensing device 1.
- the microprocessor may further be composed of one or more processors, and in the case of more than one processor, each processor is responsible for carrying out one or more specific calculations.
- processors refers to processors in general, central processing units (CPU), application-specific integrated circuits (ASIC), logic circuits, and/or other circuits or processors capable of performing functions as required. method of the present invention.
- a box 2 preferably made of engineering plastic, has on top of it (specifically the cylindrical support 14) the metal tubes (cover 11 and tube 12) from which the sensors are collected. data for determining the composition of the fuel mixture.
- an NTC temperature sensor 17 is housed in a plastic substrate 20, thus ensuring the correct positioning of the NTC sensor next to the metal wall of the cover 11.
- said plastic substrate 20 is a shaped plate capable of being fitted inside the seat 9, in a position overlapping the cylindrical support 14.
- Said plastic substrate 20 supports and positions said temperature sensor 17, as well how it supports and maintains in position the contact pins 15, 16 from the respective upper projections 15', 16' which penetrate respective through holes (not visible) of the plastic substrate 20 in order to contact and be soldered to the PCB 8, subsequently inserted and fixed in seat 9 of box 2 (see figure 6B).
- a lid 7 is attached to the box 2 preferably through a welding process, or a similar process in order to guarantee a hermetic closure of the box 2 and, therefore, of the electro-electronic components located inside said box 2 .
- the measurement of said physical characteristics occurs through the injection of a signal, by the microprocessor, with a certain frequency, with different frequencies being preferably used for different physical characteristics.
- the return of the injected signal is separated, via a peak detector circuit, and then processed according to the methodology of the present invention, in the form of programmatic instructions previously inserted into the microprocessor.
- the processor collects information about the physical characteristics of the combustible mixture. Such values are then processed not in absolute terms, but as a function of the state variable, the temperature of the fuel mixture, in order to increase the value obtained for the percentage of ethanol in said fuel mixture.
- the microprocessor calculates the value corresponding to the portion of ethanol in the mixture, in a known way.
- the senor (1) as described, has a comparatively lower production cost compared to sensors currently available on the market, making its implementation on a large scale feasible.
- Fuel sensor in particular for detecting the percentage of ethanol in a combustible mixture composed of gasoline and ethanol, said fuel sensor (1) comprising a parallelepiped box (2) which internally defines a seat ( 9) for a PCB circuit board (8) and since the box (2) comprises, externally, tabs (3) projecting from opposite sides, a terminal (6) for electrical connection and two terminals (4, 5) for hydraulic connection, one opposite the other, and intended to be respectively coupled to a tube coming from the fuel tank and to a tube directed to the fuel gallery, said fuel sensor (1) further comprising a sensing element (10) in the form of an external cylindrical cover (11) which surrounds an internal cylindrical tube (12), and because said sensing element (10) is fixed to the housing (2 ) from a cylindrical support (14); the cover (11) of the sensing element (10) being electrically connected to the PCB board (8) from a first contact pin (15) and the tube (12) being electrically connected to the PCB board (8) from a second contact pin (16), said contact pins (15, 16) passing
- Fuel sensor with the first contact pin (15) comprising a cylindrical body provided with a first upper projection (15Q cylindrical, said first upper projection ( 157 ) having a reduced diameter and being able to penetrate a respective through hole of the plastic substrate (20) and a respective through hole of the PCB board (8) and be welded to it, and the cylindrical body of the first contact pin (15) is inferiorly connected, mechanically and electrically, with the respective cover (11) of the sensing element (10).
- the second contact pin (16) comprising a cylindrical body provided with a second cylindrical upper projection ( 167 ), said second upper projection ( 167 ) having a reduced diameter and being able to penetrate a respective through hole of the plastic substrate (20) and a respective through hole of the PCB board (8) and be soldered to it, and the cylindrical body of the second contact pin (16) is inferiorly connected, mechanically and electrically, with the respective tube (12) of the sensing element (10).
- each of the first and second contact pins (15, 16) comprising respective sealing rings (18), or O-rings, which surround the cylindrical body of each of said contact pins. contact.
- Fuel sensor with the cylindrical support (14) being over-injected around the sensing element (10).
- Fuel sensor with the relative fixation between the cover (11) and the tube (12) being carried out in the central region of the sensing element (10), through a lock (13), the fixation being obtained in cooperation with contact pins (15, 16).
- Fuel sensor with the input terminal (4) being defined by the projecting end of the cylindrical support (14), and the output terminal (5) being defined by a portion of the cover (11) that is projects beyond the opposite end of the cylindrical support (14).
- each of said flaps (3) comprising through holes within each of which an oblong bushing (19) is provided, each of which is preferably arranged at 90° to the other .
- Fuel sensor comprising a lid (7) closing the box (2), said lid (7) being fixed through a welding process in order to guarantee a hermetic closure of the box (2).
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Abstract
Description
Sensor de Combustível e Método de Sensoriamento Fuel Sensor and Sensing Method
[001] A presente invenção se refere a um sensor de combustível, tal como um sensor destinado a identificar o percentual de mistura entre dois combustíveis. [001] The present invention relates to a fuel sensor, such as a sensor designed to identify the percentage of mixture between two fuels.
Estado da Arte State of art
[002] Como amplamente sabido pelos técnicos do setor, a mistura entre combustíveis é uma solução utilizada no Brasil e também em outras partes do mundo. Em particular, o uso de um combustível na forma de uma mistura de álcool advindo de quaisquer formas possíveis, principal mente das renováveis, e gasolina, em especial de álcool etílico (etanol) e gasolina traz uma série de vantagens para o consumidor, tal como um melhor controle em relação ao custo do combustível por km rodado. Ademais, os consumidores com melhores conhecimentos técnicos também estão aptos a administrar a diferença de desempenho gerado no motor de combustão interna (MCI) por cada um destes combustíveis, individualmente falando. Neste sentido, e devido às diferenças químicas entre o etanol e a gasolina, principalmente em termos de tamanho de cadeia química (a cadeia de carbonos da gasolina é muito maior e variada que a do que a do etanol), a queima de cada um destes combustíveis assume particularidades as quais levam a variações nas respectivas taxas de compressão e no torque gerado pelo MCI. Não irrelevante recordar que, em virtude destas mesmas diferenças químicas, especifica mente nas respectivas cadeias de carbono, a quantidade de oxigênio necessária para queimar um dado volume de gasolina é diversa da quantidade de oxigênio necessária para queimar um mesmo volume de etanol. [002] As widely known by technicians in the sector, mixing fuels is a solution used in Brazil and also in other parts of the world. In particular, the use of a fuel in the form of a mixture of alcohol coming from any possible form, mainly from renewable sources, and gasoline, especially ethyl alcohol (ethanol) and gasoline, brings a series of advantages to the consumer, such as better control over the cost of fuel per km driven. Furthermore, consumers with better technical knowledge are also able to manage the difference in performance generated in the internal combustion engine (MCI) by each of these fuels, individually. In this sense, and due to the chemical differences between ethanol and gasoline, mainly in terms of the size of the chemical chain (gasoline's carbon chain is much larger and more varied than that of ethanol), the burning of each of these Fuels take on particularities which lead to variations in the respective compression ratios and torque generated by the MCI. It is not irrelevant to remember that, due to these same chemical differences, specifically in the respective carbon chains, the amount of oxygen needed to burn a given volume of gasoline is different from the amount of oxygen needed to burn the same volume of ethanol.
[003] A despeito das vantagens supracitadas, o uso de misturas variáveis de combustíveis, ou seja, o percentual de cada combustível individual na mistura, com livre escolha do motorista, varia em função do abastecimento do veículo bem como acarreta questões de gerenciamento que vão além do controle usual do MCI em função das condições momentâneas de condução do veículo. Assim sendo, uma vez que o condutor demanda certo torque (via acionamento do pedal do acelerador e consequente liberação do fluxo de ar), a ECU (central eletrônica de gerenciamento do motor) determina a quantidade de combustível através do tempo de injeção em função das variáveis tradicionais (fluxo de ar na admissão, temperatura, rotação do motor, etc.), mas também em função das características do combustível (ou mistura de combustíveis) que será queimado ou, em termos práticos, da relação A/F (relação entre ar/combustível) determinada pelos respectivos percentuais dos combustíveis individuais que compõem a mistura de combustível em uso. [003] Despite the aforementioned advantages, the use of variable fuel mixtures, that is, the percentage of each individual fuel in the mixture, with the driver's free choice, varies depending on the vehicle's supply as well as entails management issues that will in addition to the usual MCI control depending on the vehicle's current driving conditions. Therefore, once the driver demands a certain torque (by pressing the accelerator pedal and consequently releasing the air flow), the ECU (electronic engine management center) determines the amount of fuel through the injection time depending on the traditional variables (intake air flow, temperature, engine speed, etc.), but also depending on the characteristics of the fuel (or mixture of fuels) that will be burned or, in practical terms, the A/F ratio (air/fuel ratio) determined by the respective percentages of individual fuels that make up the fuel mixture in use.
[004] A técnica conhece algumas formas de determinar a relação A/F para a mistura de combustíveis que está sendo usada, as quais podem ser divididas em dois grupos: [004] The art knows some ways of determining the A/F ratio for the fuel mixture being used, which can be divided into two groups:
Grupo 1 - calculada a partir das características dos gases gerados na queima do combustível. Neste caso, o resultado da combustão de uma dada massa de combustível formado por uma mistura desconhecida é monitorado em função do resultado obtido (composição dos gases de exaustão através da sonda de oxigênio, torque, etc.) e o valor de A/F devidamente ajustado para que se obtenha uma queima ideal do combustível. As principais desvantagens destes métodos estão no tempo necessário para se obter o valor exato da relação A/F para a mistura que está sendo queimada, em termos de ciclo do motor, bem como e principalmente no constante processamento destes dados, consumindo parte da capacidade finita de processamento da ECU, fatores estes somados as criticidades impostas pelo incremento da pressão de combustão nos motores sobrealimentados com injeção direta na câmara de combustão (Dl - injeção direta). Group 1 - calculated based on the characteristics of the gases generated when burning the fuel. In this case, the result of combustion of a given mass of fuel formed by an unknown mixture is monitored depending on the result obtained (composition of exhaust gases through the oxygen probe, torque, etc.) and the A/F value accordingly. adjusted to obtain optimal fuel burning. The main disadvantages of these methods are the time required to obtain the exact value of the A/F ratio for the mixture being burned, in terms of engine cycle, as well as and mainly in the constant processing of this data, consuming part of the finite capacity. of ECU processing, these factors are added to the criticalities imposed by the increase in combustion pressure in supercharged engines with direct injection into the combustion chamber (Dl - direct injection).
Grupo 2 - através do uso de sensores de combustível, geralmente dispostos na linha de alimentação de combustível, entre o reservatório de combustível e a galeria de alimentação dos injetores, e que pode eliminar a necessidade de qualquer tipo de processamento complementar para se obter a relação A/F já que o valor, analógico ou digital, fornecido pelo sensor indica a composição do combustível, composição esta diretamente vinculada a um valor de A/F preciso. Nos sensores atualmente disponíveis no mercado, a composição percentual do combustível é determinada a partir da medição da capacitância, a despeito de existirem publicações atinentes a outras formas/propriedades para se obter a composição percentual do combustível. Group 2 - through the use of fuel sensors, generally arranged in the fuel supply line, between the fuel tank and the injector supply gallery, and which can eliminate the need for any type of complementary processing to obtain the ratio A/F since the value, analog or digital, provided by the sensor indicates the composition of the fuel, this composition is directly linked to a precise A/F value. In sensors currently available on the market, the percentage composition of the fuel is determined by measuring the capacitance, despite there being publications relating to other ways/properties to obtain the percentage composition of the fuel.
[005] Outra função do referido sensor de combustível é determinar, por exemplo através da capacitância, a porcentagem de água existente na mistura, a qual compromete a vida útil dos componentes do sistema de injeção. [006] Não obstante tal vantagem em termos de economia de processamento pela ECU, os sensores de combustível também não estão livres de inconvenientes. Dentre estes é possível citar o custo de produção e a precisão de leitura como os óbices mais relevantes para o emprego massivo desta linha de solução técnica. [005] Another function of said fuel sensor is to determine, for example through capacitance, the percentage of water in the mixture, which compromises the useful life of the injection system components. [006] Despite this advantage in terms of processing savings by the ECU, fuel sensors are also not free from drawbacks. Among these, it is possible to mention the production cost and reading accuracy as the most relevant obstacles to the massive use of this line of technical solution.
[007] De fato, a determinação dos percentuais de etanol e de água, exclusiva mente a partir da capacitância da mistura combustível, tem se mostrado historicamente uma solução imprecisa posto que a curva que a define não é uma reta bem comportada, mas apresenta regiões com inclinações distintas, assim prejudicando a precisão da indicação em certas faixas de concentração do etanol e de água. [007] In fact, determining the percentages of ethanol and water, exclusively based on the capacitance of the fuel mixture, has historically proven to be an imprecise solution since the curve that defines it is not a well-behaved straight line, but presents regions with different slopes, thus compromising the accuracy of the indication in certain ethanol and water concentration ranges.
[008] O documento US 2008/295574, ou o BRPI0801181, genericamente ensina que a determinação do conteúdo de água em uma mistura de combustíveis permite incrementar o controle motor de um veículo. Não obstante, não é apresentada nenhuma forma de realização para um sensor deste tipo. [008] Document US 2008/295574, or BRPI0801181, generally teaches that determining the water content in a fuel mixture allows increasing the motor control of a vehicle. However, no embodiment is presented for a sensor of this type.
[009] O documento US 10018613 ensina um dispositivo sensor baseado em um circuito LCR ressonante. Um estímulo elétrico é aplicado ao fluido em análise, via eletrodos, enquanto que o sinal de retorno é analisado por processadores de modo a determinar a composição do fluido. Em particular, ao menos um processador é utilizado para determinar o percentual de água no fluido com base no processamento da resposta espectral da impedância ressonante. A despeito deste dispositivo estar apto a determinar, via processamento, o percentual de água (entre outros) de um fluido, o mesmo pode apresentar riscos caso a mistura não seja inerte, uma vez que uma corrente elétrica deve atravessar o líquido. [009] Document US 10018613 teaches a sensing device based on a resonant LCR circuit. An electrical stimulus is applied to the fluid under analysis, via electrodes, while the return signal is analyzed by processors in order to determine the composition of the fluid. In particular, at least one processor is used to determine the percentage of water in the fluid based on processing the resonant impedance spectral response. Although this device is able to determine, via processing, the percentage of water (among others) in a fluid, it can present risks if the mixture is not inert, since an electric current must pass through the liquid.
[0010] O documento US 5150683 ensina um método e um sensor para determinar os respectivos percentuais de uma mistura entre dois fluidos apresentando propriedades dielétricas substancialmente diferentes, tais como misturas entre gasolina e álcool ou óleo combustível e água. Um enrolamento indutivo é imerso na mistura e assim apresenta uma capacitância a qual é diretamente proporcional a constante dielétrica da mistura que envolve o enrolamento e que, por sua vez, é diretamente proporcional ao percentual de cada fluido na mistura. As espiras do enrolamento atuam como equivalentes a eletrodos, assim gerando uma capacitância entre cada espira. Um circuito converte o sinal em frequência (gerado por um amplificador que oscila na frequência de ressonância do circuito LC do enrolamento) e o envia para o controle motor, de modo a promover os ajustes necessários no tempo de ignição. [0010] Document US 5150683 teaches a method and a sensor for determining the respective percentages of a mixture between two fluids having substantially different dielectric properties, such as mixtures between gasoline and alcohol or fuel oil and water. An inductive winding is immersed in the mixture and thus presents a capacitance which is directly proportional to the dielectric constant of the mixture that surrounds the winding and which, in turn, is directly proportional to the percentage of each fluid in the mixture. The winding turns act as equivalent to electrodes, thus generating a capacitance between each turn. A circuit converts the signal into frequency (generated by an amplifier that oscillates at the resonant frequency of the winding's LC circuit) and sends it to the motor control, in order to make the necessary adjustments in the ignition timing.
[0011] O documento JPH 0443835 ensina um sensor de álcool em uma mistura combustível no qual a temperatura da mistura e a quantidade de água na mistura são levados em consideração para que se possa obter uma quantificação do álcool mais precisa, sendo estes parâmetros empregados para compensar o percentual de álcool detectado por um sensor de combustível. As mudanças de frequência de oscilação são analisadas já que devidas ao percentual de álcool e a temperatura da mistura, entre outros através da capacidade eletrostática da mistura que atravessa dois eletrodos do sensor. A compensação do percentual de álcool é realizada através de uma tabela inserida nos meios de computação. [0011] Document JPH 0443835 teaches an alcohol sensor in a combustible mixture in which the temperature of the mixture and the amount of water in the mixture are taken into account so that a more accurate alcohol quantification can be obtained, these parameters being used to compensate for the percentage of alcohol detected by a fuel sensor. The changes in oscillation frequency are analyzed due to the percentage of alcohol and the temperature of the mixture, among others through the electrostatic capacity of the mixture that passes through two electrodes of the sensor. The alcohol percentage compensation is carried out using a table inserted in the computing means.
Objetivos da Invenção Objectives of the Invention
[0012] Desta forma, constitui um primeiro objetivo da invenção um dispositivo sensor para a detecção do percentual de uma mistura de combustíveis em fluxo, apto a superar os inconvenientes da arte. [0012] Therefore, a first objective of the invention is a sensor device for detecting the percentage of a mixture of fuels in flow, capable of overcoming the drawbacks of the art.
[0013] Constitui outro objetivo da presente invenção um sensor de combustível, apto de determinar o percentual de etanol em uma mistura combustível compreendendo etanol e gasolina. [0013] Another objective of the present invention is a fuel sensor, capable of determining the percentage of ethanol in a fuel mixture comprising ethanol and gasoline.
[0014] Este e outros objetivos da presente invenção são alcançados, e plenamente satisfeitos, a partir de um sensor do combustível conforme definido na reivindicação 1. [0014] This and other objectives of the present invention are achieved, and fully satisfied, from a fuel sensor as defined in claim 1.
Breve Descrição das Figuras Brief Description of Figures
[0015] O objeto da presente invenção será mais bem compreendido a partir da descrição detalhada que segue de uma forma preferencial de realização da invenção, a qual é feita com o suporte das figuras em anexo, trazidas a título ilustrativo e não limitativo, nas quais: [0015] The object of the present invention will be better understood from the detailed description that follows of a preferred form of carrying out the invention, which is made with the support of the attached figures, brought for illustrative and non-limiting purposes, in which :
- A figura 1 é uma vista em perspectiva de um sensor de combustível, de acordo com a invenção; - Figure 1 is a perspective view of a fuel sensor, according to the invention;
- A figura 2 é uma vista em secção do sensor de combustível de acordo com o corte II-II da figura 1; - A figura 3 é uma vista esquemática em perspectiva ilustrando as conexões elétricas da capa (tubo externo) e do tubete (tubo interno) de medição por meio dos respectivos pinos de contato; - Figure 2 is a sectional view of the fuel sensor according to section II-II of figure 1; - Figure 3 is a schematic perspective view illustrating the electrical connections of the cover (external tube) and the measuring tube (internal tube) through the respective contact pins;
- A figura 4 é uma vista em secção transversal dos tubos do sensor de acordo com o corte IV-IV da figura 3; - Figure 4 is a cross-sectional view of the sensor tubes according to section IV-IV of Figure 3;
- A figura 5 é uma vista em perspectiva superior e explodida do sensor de combustível; e- Figure 5 is an exploded top perspective view of the fuel sensor; It is
- As figuras 6A e 6B são vistas em perspectiva inferior e explodidas do sensor de combustível, ilustrando duas etapas de montagem das partes componentes do sensor. - Figures 6A and 6B are bottom and exploded views of the fuel sensor, illustrating two stages of assembly of the sensor's component parts.
[0016] De conformidade com as ilustrações supra descritas, com 1 é indicado, no seu todo, um sensor de combustível, de acordo com a presente invenção. O sensor de combustível, também designável como sensor de etanol, é basicamente definido por uma caixa 2 paralelepipédica, interiormente vazia e que define uma sede 9 apta a receber uma placa de circuito, ou PCB 8, a qual recebe as conexões com o elemento sensor 10, com o conector 6, além de portar os componentes eletrônicos destinados a processar os sinais recebidos do elemento sensor e enviar um sinal processado, via conector 6 até a ECU (não ilustrada) de um veículo (não ilustrado). Nas laterais opostas da caixa 2 são previstas abas 3, integrais em relação a dita caixa, para a fixação da mesma em um substrato apropriado do veículo, por exemplo no chassis, ou alternativa mente no MCI. Para tanto, em cada um dos furos passantes das abas 3 é inserida uma bucha oblonga 19, cada uma das quais preferencial mente disposta a 90° em relação a outra. [0016] In accordance with the illustrations described above, 1 indicates, as a whole, a fuel sensor, according to the present invention. The fuel sensor, also designable as an ethanol sensor, is basically defined by a parallelepiped box 2, internally empty and which defines a seat 9 capable of receiving a circuit board, or PCB 8, which receives the connections with the sensing element. 10, with connector 6, in addition to carrying the electronic components intended to process the signals received from the sensor element and send a processed signal, via connector 6, to the ECU (not illustrated) of a vehicle (not illustrated). On the opposite sides of the box 2, tabs 3 are provided, integral in relation to said box, for fixing it on an appropriate substrate of the vehicle, for example on the chassis, or alternatively on the MCI. To this end, an oblong bushing 19 is inserted into each of the through holes of the flaps 3, each of which is preferably arranged at 90° to the other.
[0017] A partir das laterais superiores projetam-se dois terminais 4, 5 de conexão, um oposto ao outro, e destinados a serem respectiva mente acoplados a um tubo (não ilustrado) proveniente do reservatório de combustível e o tubo (não ilustrado) direcionado a galeria de combustível que alimenta o MCI. Mais especifica mente, a partir da porção inferior da caixa 2 (vide em particular a figura 5) é previsto um suporte cilíndrico 14, integral em relação a dita caixa, e apto a manter fixado internamente o dito elemento sensor 10. Uma primeira extremidade projetante do suporte cilíndrico 14 define o terminal de entrada 4 para o tubo proveniente do reservatório de combustível. [0017] Two connection terminals 4, 5 project from the upper sides, one opposite the other, and intended to be respectively coupled to a tube (not illustrated) coming from the fuel tank and the tube (not illustrated) directed to the fuel gallery that feeds the MCI. More specifically, from the lower portion of the box 2 (see in particular figure 5) a cylindrical support 14 is provided, integral with said box, and capable of keeping said sensor element 10 fixed internally. of the cylindrical support 14 defines the input terminal 4 for the tube coming from the fuel tank.
[0018] O dito elemento sensor 10 é fixado no interior do suporte cilíndrico 14 de forma mecânica e hidraulicamente isolado em relação ao interior da caixa 2. O dito elemento sensor 10, conforme ilustrado nas figuras 3 e 4, é definido por uma capa 11 externa e que recebe, concêntrica mente, um tubete 12 interno. O combustível proveniente do terminal de entrada 4 atravessa o elemento sensor 10 pela região cilíndrica externamente delimitada pela capa li e internamente delimitada pelo tubete 12. A capa 11 externa se projeta para além do suporte cilíndrico 14 e define o terminal de saída 5, apto a ser acoplado pelo dito tubo de alimentação da galeria de combustível. [0018] Said sensor element 10 is fixed inside the cylindrical support 14 mechanically and hydraulically isolated in relation to the interior of the box 2. Said sensor element 10, as illustrated in figures 3 and 4, is defined by an external cover 11 and which receives, concentrically, an internal tube 12. The fuel coming from the input terminal 4 passes through the sensing element 10 through the cylindrical region externally delimited by the cap I and internally delimited by the tube 12. The external cap 11 projects beyond the cylindrical support 14 and defines the output terminal 5, capable of be coupled by said fuel gallery supply pipe.
[0019] A fixação relativa entre a capa Íl e o tubete 12 é realizada na região central do elemento sensor 10, através de uma trava 13 em cooperação com pinos de contato 15, 16, os quais serão descritos mais adiante. É ainda previsto um sensor de temperatura 17 tipo NTC (vide a figura 5), apto de determinar a temperatura da mistura combustível na região do elemento sensor 10 na qual as características físicas da mistura combustível são coletadas. [0019] The relative fixation between the cover II and the tube 12 is carried out in the central region of the sensing element 10, through a lock 13 in cooperation with contact pins 15, 16, which will be described later. An NTC type temperature sensor 17 is also provided (see figure 5), capable of determining the temperature of the combustible mixture in the region of the sensing element 10 in which the physical characteristics of the combustible mixture are collected.
[0020] Conforme mais bem ilustrado nas figuras de 2 a 4, a capa Íl e o tubete 12 apresentam respectivos pinos de contato 16, 15 elétrico dos tubete e capa com a placa PCB 8. Cada um de ditos pinos de contato 15, 16 apresenta a forma específica e apta a serem conectados, por exemplo, por solda, na PCB 8. Mais em particular, cada um dos pinos de contato apresenta um corpo cilíndrico com uma projeção superior 15', 16', com diâmetro reduzido, apta a penetrar na PCB 8 e ser nesta soldada, além de inferiormente conectado, mecânica e eletricamente, com a respectiva capa 11 e tubete 12. Obviamente, ditos pinos de contato 15, 16 são eletricamente isolados um do outro pelo material isolante de confecção da caixa 2, entre outros. Já o isolamento hidráulico de cada um dos pinos de contato 15, 16 é realizado por respectivos anéis de vedação 18, ou O-rings, os quais envolvem o corpo cilíndrico de cada um dos pinos de contato, assim impedindo que o combustível em fluxo pelo interior do elemento sensor adentre na sede 9 da caixa 2, conforme ilustrado na figura 2. [0020] As best illustrated in figures 2 to 4, the cover 1 and the tube 12 have respective electrical contact pins 16, 15 of the tube and cover with the PCB board 8. Each of said contact pins 15, 16 has a specific shape and is capable of being connected, for example, by soldering, to the PCB 8. More in particular, each of the contact pins has a cylindrical body with an upper projection 15', 16', with a reduced diameter, suitable for penetrate the PCB 8 and be soldered to it, in addition to being mechanically and electrically connected underneath, with the respective cover 11 and tube 12. Obviously, said contact pins 15, 16 are electrically isolated from each other by the insulating material used to make the box 2 , between others. The hydraulic isolation of each of the contact pins 15, 16 is carried out by respective sealing rings 18, or O-rings, which surround the cylindrical body of each of the contact pins, thus preventing the fuel from flowing through the inside the sensor element enters seat 9 of box 2, as shown in figure 2.
[0021] A dita placa PCB 8, tal como ilustrada nas figuras 5 e 6B, apresenta uma conformação preferencial mente cooperante com a dita sede 9 definida no interior da caixa 2 e contempla ainda componentes de processamento, tal como um microprocessador, ou similar, apto a receber os sinais provenientes das características físicas medidas pelo elemento sensor, bem como a leitura da temperatura fornecida pelo sensor de temperatura NTC 17, além de outros componentes discretos. Em particular, os componentes discretos instalados na PCB 8 definem um circuito RC o qual atua em paralelo com o elemento sensor 10, de modo a excitar/alimentar o elemento sensor 10, bem como recuperar as medidas de tensão oriundas do elemento sensor 10 imerso no fluxo de combustível, conforme técnica conhecida na arte. [0021] Said PCB board 8, as illustrated in figures 5 and 6B, presents a conformation preferably cooperative with said seat 9 defined inside the box 2 and also includes processing components, such as a microprocessor, or similar, capable of receiving signals from the physical characteristics measured by the sensing element, as well as the temperature reading provided by the temperature sensor. NTC temperature 17, in addition to other discrete components. In particular, the discrete components installed on the PCB 8 define an RC circuit which acts in parallel with the sensing element 10, in order to excite/power the sensing element 10, as well as recover voltage measurements originating from the sensing element 10 immersed in the fuel flow, according to a technique known in the art.
[0022] O microprocessador pode ser um processador de uso geral, ou uma unidade de processamento dedicada e programada de modo a realizar as funções pré- determinadas pelo método de atuação do dispositivo sensor de combustível 1. O microprocessador pode ainda ser composto de um ou mais processadores, sendo que, no caso de mais de um processador, cada processador é responsável pela realização de um ou mais cálculos determinados. Como ora empregado, o termo "microprocessador" se refere a processadores em geral, unidades centrais de processamento (CPU), circuitos integrados de aplicação específica (ASIC), circuitos lógicos, e/ou outros circuitos ou processadores aptos a executar as funções conforme o método da presente invenção. [0022] The microprocessor may be a general purpose processor, or a dedicated processing unit programmed to perform the functions predetermined by the actuation method of the fuel sensing device 1. The microprocessor may further be composed of one or more processors, and in the case of more than one processor, each processor is responsible for carrying out one or more specific calculations. As used herein, the term "microprocessor" refers to processors in general, central processing units (CPU), application-specific integrated circuits (ASIC), logic circuits, and/or other circuits or processors capable of performing functions as required. method of the present invention.
[0023] Em relação a montagem do sensor 1, uma caixa 2, preferencial mente confeccionada em plástico de engenharia traz sobrei njetados (especifica mente pelo suporte cilíndrico 14) os tubos metálicos (capa 11 e tubete 12) a partir dos quais são coletados os dados para a determinação da composição da mistura combustível. Em complemento e para compensação e análise da temperatura do combustível, um sensor de temperatura 17 NTC é alojado em um substrato plástico 20 desta forma garantindo o correto posicionamento do sensor NTC junto a parede metálica da capa 11. Mais em particular, o dito substrato plástico 20 (vide especifica mente as figuras 6A e 2) é uma placa conformada e apta a ser encaixada no interior da sede 9, em posição sobrepondo o suporte cilíndrico 14. O dito substrato plástico 20 suporta e posiciona o dito sensor de temperatura 17, bem como suporta e mantém em posição os pinos de contato 15, 16 a partir das respectivas projeções superiores 15', 16' as quais penetram em respectivos furos passantes (não visíveis) do substrato plástico 20 de modo a contatarem e serem soldados na PCB 8, posteriormente inserida e fixada na sede 9 da caixa 2 (vide a figura 6B). [0023] In relation to the assembly of the sensor 1, a box 2, preferably made of engineering plastic, has on top of it (specifically the cylindrical support 14) the metal tubes (cover 11 and tube 12) from which the sensors are collected. data for determining the composition of the fuel mixture. In addition, for compensation and analysis of the fuel temperature, an NTC temperature sensor 17 is housed in a plastic substrate 20, thus ensuring the correct positioning of the NTC sensor next to the metal wall of the cover 11. More in particular, said plastic substrate 20 (see specifically figures 6A and 2) is a shaped plate capable of being fitted inside the seat 9, in a position overlapping the cylindrical support 14. Said plastic substrate 20 supports and positions said temperature sensor 17, as well how it supports and maintains in position the contact pins 15, 16 from the respective upper projections 15', 16' which penetrate respective through holes (not visible) of the plastic substrate 20 in order to contact and be soldered to the PCB 8, subsequently inserted and fixed in seat 9 of box 2 (see figure 6B).
[0024] Após a inserção e posicionamento dos componentes internos da caixa 2, em ordem, uma tampa 7 é unida a caixa 2 preferencial mente através de um processo de soldagem, ou de um processo similar de modo a garantir um fechamento hermético da caixa 2 e, portanto, dos componentes eletro-eletrônicos situados no interior de dita caixa 2. [0024] After insertion and positioning of the internal components of box 2, in order, a lid 7 is attached to the box 2 preferably through a welding process, or a similar process in order to guarantee a hermetic closure of the box 2 and, therefore, of the electro-electronic components located inside said box 2 .
[0025] Já em relação ao funcionamento do dito sensor 1, a medição das ditas características físicas ocorre a partir da injeção de um sinal, pelo microprocessador, com uma determinada frequência, sendo preferencial mente utilizadas frequências distintas para características físicas distintas. O retorno do sinal injetado é separado, via um circuito detector de pico, e então processado de acordo com a metodologia da presente invenção, na forma de instruções programáticas previamente inseridas no microprocessador. [0025] Regarding the operation of said sensor 1, the measurement of said physical characteristics occurs through the injection of a signal, by the microprocessor, with a certain frequency, with different frequencies being preferably used for different physical characteristics. The return of the injected signal is separated, via a peak detector circuit, and then processed according to the methodology of the present invention, in the form of programmatic instructions previously inserted into the microprocessor.
[0026] Por fim, o processador coleta as informações sobre as características físicas da mistura combustível. Tais valores são então processados não em termos absolutos, mas o são em função da variável de estado, a temperatura da mistura combustível, de modo a incrementar o valor obtido de percentual de etanol na dita mistura combustível. [0026] Finally, the processor collects information about the physical characteristics of the combustible mixture. Such values are then processed not in absolute terms, but as a function of the state variable, the temperature of the fuel mixture, in order to increase the value obtained for the percentage of ethanol in said fuel mixture.
[0027] Capturados e processados os referidos valores das características físicas da mistura combustível para uma dada temperatura medida, o microprocessador calcula o valor correspondente a parcela de etanol na mistura, de forma conhecida. [0027] Having captured and processed said values of the physical characteristics of the fuel mixture for a given measured temperature, the microprocessor calculates the value corresponding to the portion of ethanol in the mixture, in a known way.
[0028] A partir desta metodologia é possível aferir um valor com alta precisão para o percentual de etanol e água na mistura combustível, o que leva a um melhor ajuste das condições de funcionamento do MCI (motor de combustão interna), pela ECU (central eletrônica de gerenciamento do motor). [0028] Using this methodology, it is possible to measure a highly accurate value for the percentage of ethanol and water in the fuel mixture, which leads to a better adjustment of the operating conditions of the MCI (internal combustion engine), by the ECU (central engine management electronics).
[0029] Além disto, o sensor (1), tal como descrito, apresenta um custo de produção comparativa mente menor em relação aos sensores disponíveis no mercado, atualmente, viabilizando sua implementação em grande escala. [0029] Furthermore, the sensor (1), as described, has a comparatively lower production cost compared to sensors currently available on the market, making its implementation on a large scale feasible.
Formas de Realização Forms of Realization
[0030] Sensor de combustível, em particular para a detecção do percentual de etanol em uma mistura combustível composta por gasolina e etanol, o dito sensor de combustível (1) compreendendo uma caixa (2) paralelepipédica a qual define, internamente, uma sede (9) para uma placa de circuito PCB (8) e sendo que a caixa (2) compreende, externamente, abas (3) projetantes a partir de laterais opostas, um terminal (6) de conexão elétrica e dois terminais (4, 5) de conexão hidráulica, um oposto ao outro, e destinados a serem respectiva mente acoplados a um tubo proveniente do reservatório de combustível e a um tubo direcionado a galeria de combustível, o dito sensor de combustível (1) compreendendo ainda um elemento sensor (10) na forma de uma capa (11) cilíndrica externa a qual envolve um tubete (12) cilíndrico interno, e por o dito elemento sensor (10) ser fixado na caixa (2) a partir de um suporte cilíndrico (14); a capa (11) do elemento sensor (10) estando eletricamente conectada a placa PCB (8) a partir de um primeiro pino de contato (15) e o tubete (12) estando eletricamente conectado a placa PCB (8) a partir de um segundo pino de contato (16), os ditos pinos de contato (15, 16) transpassando o suporte cilíndrico (14) e sendo suportados e mantidos em posição por um substrato plástico (20), fixado no interior da sede (9) da caixa (2). [0030] Fuel sensor, in particular for detecting the percentage of ethanol in a combustible mixture composed of gasoline and ethanol, said fuel sensor (1) comprising a parallelepiped box (2) which internally defines a seat ( 9) for a PCB circuit board (8) and since the box (2) comprises, externally, tabs (3) projecting from opposite sides, a terminal (6) for electrical connection and two terminals (4, 5) for hydraulic connection, one opposite the other, and intended to be respectively coupled to a tube coming from the fuel tank and to a tube directed to the fuel gallery, said fuel sensor (1) further comprising a sensing element (10) in the form of an external cylindrical cover (11) which surrounds an internal cylindrical tube (12), and because said sensing element (10) is fixed to the housing (2 ) from a cylindrical support (14); the cover (11) of the sensing element (10) being electrically connected to the PCB board (8) from a first contact pin (15) and the tube (12) being electrically connected to the PCB board (8) from a second contact pin (16), said contact pins (15, 16) passing through the cylindrical support (14) and being supported and maintained in position by a plastic substrate (20), fixed inside the seat (9) of the box (two).
[0031] Sensor de combustível, sendo que o primeiro pino de contato (15) compreende um corpo cilíndrico dotado de uma primeira projeção superior (15Q cilíndrica, a dita primeira projeção superior (157) com diâmetro reduzido e estando apta a penetrar um respectivo furo passante do substrato plástico (20) e um respectivo furo passante da placa PCB (8) e ser nesta soldada, e sendo que o corpo cilíndrico do primeiro pino de contato (15) é inferiormente conectado, mecânica e eletricamente, com a respectiva capa (11) do elemento sensor (10). [0031] Fuel sensor, with the first contact pin (15) comprising a cylindrical body provided with a first upper projection (15Q cylindrical, said first upper projection ( 157 ) having a reduced diameter and being able to penetrate a respective through hole of the plastic substrate (20) and a respective through hole of the PCB board (8) and be welded to it, and the cylindrical body of the first contact pin (15) is inferiorly connected, mechanically and electrically, with the respective cover (11) of the sensing element (10).
[0032] Sensor de combustível, sendo que o segundo pino de contato (16) compreende um corpo cilíndrico dotado de uma segunda projeção superior (167) cilíndrica, a dita segunda projeção superior (167) com diâmetro reduzido e estando apta a penetrar um respectivo furo passante do substrato plástico (20) e um respectivo furo passante da placa PCB (8) e ser nesta soldada, e sendo que o corpo cilíndrico do segundo pino de contato (16) é inferiormente conectado, mecânica e eletricamente, com o respectivo tubete (12) do elemento sensor (10). [0032] Fuel sensor, the second contact pin (16) comprising a cylindrical body provided with a second cylindrical upper projection ( 167 ), said second upper projection ( 167 ) having a reduced diameter and being able to penetrate a respective through hole of the plastic substrate (20) and a respective through hole of the PCB board (8) and be soldered to it, and the cylindrical body of the second contact pin (16) is inferiorly connected, mechanically and electrically, with the respective tube (12) of the sensing element (10).
[0033] Sensor de combustível, sendo que cada um dos primeiro e segundo pinos de contato (15, 16) compreende respectivos anéis de vedação (18), ou O-rings, os quais envolvem o corpo cilíndrico de cada um dos ditos pinos de contato. [0033] Fuel sensor, each of the first and second contact pins (15, 16) comprising respective sealing rings (18), or O-rings, which surround the cylindrical body of each of said contact pins. contact.
[0034] Sensor de combustível, sendo que o suporte cilíndrico (14) é sobreinjetado ao redor do elemento sensor (10). [0035] Sensor de combustível, sendo que a fixação relativa entre a capa (11) e o tubete (12) é realizada na região central do elemento sensor (10), através de uma trava (13), a fixação sendo obtida em cooperação com pinos de contato (15, 16). [0034] Fuel sensor, with the cylindrical support (14) being over-injected around the sensing element (10). [0035] Fuel sensor, with the relative fixation between the cover (11) and the tube (12) being carried out in the central region of the sensing element (10), through a lock (13), the fixation being obtained in cooperation with contact pins (15, 16).
[0036] Sensor de combustível, sendo que o terminal de entrada (4) é definido por extremidade projetante do suporte cilíndrico (14), e sendo que o terminal de saída (5) é definido por uma porção da capa (11) que se projeta para além da extremidade oposta do suporte cilíndrico (14). [0036] Fuel sensor, with the input terminal (4) being defined by the projecting end of the cylindrical support (14), and the output terminal (5) being defined by a portion of the cover (11) that is projects beyond the opposite end of the cylindrical support (14).
[0037] Sensor de combustível, sendo que o substrato plástico (20) suporta e posiciona um sensor de temperatura (17). [0037] Fuel sensor, with the plastic substrate (20) supporting and positioning a temperature sensor (17).
[0038] Sensor de combustível, sendo que cada uma de ditos abas (3) compreende furos passantes no interior de cada um dos quais é prevista uma bucha oblonga (19), cada uma das quais preferencial mente disposta a 90° em relação a outra. [0038] Fuel sensor, each of said flaps (3) comprising through holes within each of which an oblong bushing (19) is provided, each of which is preferably arranged at 90° to the other .
[0039] Sensor de combustível, compreendendo uma tampa (7) de fechamento da caixa (2), a dita tampa (7) sendo fixada através de um processo de soldagem de modo a garantir um fechamento hermético da caixa (2). [0039] Fuel sensor, comprising a lid (7) closing the box (2), said lid (7) being fixed through a welding process in order to guarantee a hermetic closure of the box (2).
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23858476.7A EP4582683A1 (en) | 2022-09-02 | 2023-09-01 | Fuel sensor and sensing method |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR102022017734 | 2022-09-02 | ||
| BR1020220177341 | 2022-09-02 | ||
| BR102023017811-1A BR102023017811A2 (en) | 2023-09-01 | FUEL SENSOR AND SENSING METHOD | |
| BR1020230178111 | 2023-09-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024044831A1 true WO2024044831A1 (en) | 2024-03-07 |
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ID=90099984
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2023/050291 Ceased WO2024044831A1 (en) | 2022-09-02 | 2023-09-01 | Fuel sensor and sensing method |
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| Country | Link |
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| WO (1) | WO2024044831A1 (en) |
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| BR102015023180A2 (en) * | 2015-09-14 | 2017-03-21 | Univ Tecnológica Fed Do Paraná | capacitive sensor for fuel composition identification for flex fuel engines for internal combustion. |
| US20190346324A1 (en) * | 2018-05-09 | 2019-11-14 | Ford Global Technologies, Llc | Integrated fuel composition and pressure sensor |
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