CN2938105Y - Vehicle speed detection device - Google Patents

Abstract

A vehicle speed detection device comprises a signal processing unit capable of receiving and processing GPS signals and outputting vehicle speed signals, an insertion unit capable of being electrically connected and inserted on a cigarette lighter, a conversion unit electrically connected with the insertion unit, a central control unit electrically connected between the signal processing unit and the conversion unit, and a display unit electrically connected with the central control unit. The central control unit can receive and process the vehicle speed signal from the signal processing unit and the rotating speed signal of the conversion unit to correspondingly output a display signal, and the display unit can receive the display signal and project an image representing the current vehicle speed and the engine rotating speed on the front windshield. The speed detecting device for the vehicle is quite convenient to assemble and use by being electrically connected with the cigarette lighter to measure the rotating speed of the engine and the design that the display unit has the function of head-up display.

Description

Vehicle speed detection device

technical field

The utility model relates to a speed detection device, in particular to a vehicle speed detection device capable of measuring vehicle speed and engine speed, and having the functions of head-up display and hands-free sound amplification.

Background technique

For many drivers, in the process of driving, they will pay attention to whether the current speed of the vehicle exceeds the speed limit and whether the current engine speed is too high to ensure driving safety. In order to be able to grasp the speed of the vehicle at any time, the driver must not Regularly lower your head to look at the pointer on the dashboard, but this way of looking away from the driving movement for a while will increase the danger of driving. Although many users currently use a speedometer with a global satellite positioning system (GPS) to know the current speed of the vehicle through the voice or sound warning of the speedometer, but they cannot provide relevant information about the engine speed, and they can only watch the instrument. It is learned from the pointer on the board, so there is still danger.

Although the industry has launched the so-called head-up display device (HEADS UPDISPLAY, HUD), by connecting the head-up display device to the microcomputer of the car, the vehicle speed and engine speed are displayed on the front windshield in front of the driver's line of sight. It can be directly viewed by the driver, but the installation method of this kind of head-up display device is very complicated. Because the current trip computer is very sophisticated, it can also actively detect changes in voltage and current. If the trip computer finds that the voltage or current is abnormal, it will send out Therefore, the head-up display device usually must be installed by professional car factory personnel, and it can only be used on the vehicle after installation, and cannot be removed at any time to be used in other vehicles, which is quite troublesome and inconvenient. In addition, due to the rapid development of mobile communication technology, many people will inevitably encounter sudden calls from mobile phones while driving. For safety reasons, more and more drivers will choose to install a hands-free speakerphone in the car. device to make it easy to answer calls. However, in this way, in addition to setting up a head-up display in the car, it is also necessary to set aside space to install devices such as a hands-free amplifier for the car, which is quite inconvenient. Therefore, if the function of head-up display, the function of measuring vehicle speed and engine speed, and the function of hands-free amplification can be integrated, and designed to be installed by users, it will be a great boon for drivers.

new content

The purpose of this utility model is to provide a vehicle speed detection device which is convenient for the driver to install and use on the premise of being easy to use on different vehicles, and has the function of displaying the vehicle speed and the engine speed at the same time.

Another purpose of the present utility model is to provide a car with a head-up display function of simultaneously displaying vehicle speed and engine speed and a hands-free loudspeaker function under the premise that it is convenient for the driver to install and use by himself and is convenient for use on different vehicles. Speed detection device.

The vehicle speed detection device of the utility model is suitable for being electrically connected and inserted on the cigarette lighter of a car and assembled on the inner side of the front windshield. A signal processing unit that outputs a vehicle speed signal corresponding to the current vehicle speed based on the signal of the system, and a plug-in unit that is detachably electrically connected to the cigarette lighter and can receive the power signal output by the cigarette lighter , a conversion unit electrically connected to the plug-in unit, a central control unit electrically connected between the signal processing unit and the conversion unit, and a display unit electrically connected to the central control unit. The conversion unit can receive and process the power signal from the plug-in unit to output a speed signal corresponding to the engine speed, and the central control unit can receive and process the vehicle speed signal from the signal processing unit and the speed signal of the conversion unit to output a corresponding display signal , the display unit includes a display mechanism that can receive the display signal and project an image representing the current vehicle speed and engine speed on the front windshield, and a brightness that can be used to adjust the brightness of the image projected by the display mechanism on the front windshield Adjustment mechanism.

Through the signal processing unit, the current vehicle speed can be directly obtained through the global satellite positioning system, the conversion unit can be electrically connected with the cigarette lighter to measure the engine speed, and the display unit has the function design of head-up display of vehicle speed and engine speed, making the car The assembly and use of the speed detection device are quite convenient.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the heat dissipation device of the present utility model is described in detail, in accompanying drawing:

Fig. 1 is the schematic diagram that the first embodiment of the vehicle speed detection device of the present invention is assembled on an automobile;

Fig. 2 is the functional block diagram of this first embodiment;

Fig. 3 is a schematic diagram of the ripple signal in the direct current output by a cigarette lighter of the car;

Fig. 4 is a schematic diagram of the second embodiment of the vehicle speed detection device of the present invention assembled on a car;

FIG. 5 is a schematic diagram of a third embodiment of a vehicle speed detection device of the present invention assembled on a rearview mirror of a vehicle.

Detailed ways

Before the present utility model is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

As shown in Figures 1 and 2, the first embodiment of the vehicle speed detection device of the present utility model is suitable for being electrically connected with a cigarette lighter 21 of an automobile 2, and assembled on the inside of the front windshield 22, which can be Data projections such as vehicle speed and engine (not shown) rotating speed are displayed on the front windshield 22 of the region in front of the driver's horizontal line of sight, and can be directly watched by the driver, and also can carry out wireless communication with a communication device 23, and provide For the function of hands-free sound amplification, the communication device 23 can be devices such as mobile phones or PDAs, but it is not limited thereto during implementation.

In this embodiment, the vehicle speed detection device includes a hollow box body 31, a signal processing unit 32 assembled in the box body 31, and a signal processing unit 32 arranged outside the box body 31 and detachably electrically connected to a point The plug-in unit 33 in the cigarette device 21, a conversion unit 34 assembled in the box body 31 electrically connected to the plug-in unit 33, and a conversion unit 34 assembled in the box body 31 and electrically connected to the signal processing unit 32 and the conversion unit The central control unit 35 between the units 34, a hands-free loudspeaker unit 36 assembled in the box body 31 and electrically connected with the central control unit 35, and a hands-free loudspeaker unit 36 located outside the box body 31 and electrically connected with the central control unit 35 Display unit 37.

The signal processing unit 32 is composed of a global positioning system (GPS) module, which can receive and process signals sent by the global positioning system, and calculate data such as height, coordinates and displacement speed. In this embodiment, the signal processing The unit 32 is used to calculate the current vehicle speed, and output a vehicle speed signal to the central control unit 35 correspondingly.

The plug unit 33 includes a conductive terminal 331 and a transmission line 330 electrically connected between the conductive terminal 331 and the conversion unit 34. The conductive terminal 331 can be matedly inserted into the aforementioned cigarette lighter 21, mainly for The DC power signal generated by the generator (not shown in the figure) of the automobile engine and outputted by the cigarette lighter 21 is transmitted to the converting unit 34 .

The conversion unit 34 includes a conversion circuit 341 electrically connected between the conductive terminal 33 and the central control unit 35 and having a plurality of action programs built in, and a conversion circuit 341 electrically connected to the conversion circuit 341 and embedded and exposed on the box body 31. Multi-stage switching switch 342 and a calibration knob 343 .

In this embodiment, the surge generated by the generator will be directly affected by the speed of the engine speed, and the engine speed will be controlled by the number of ignition times of the cylinder (not shown) of the automobile 2. The faster the cylinder ignition speed, the faster the engine speed. The faster, this transmission relationship will cause the AC power generated by the generator to be rectified from AC to DC, and then transmitted to the DC output of the cigarette lighter 21 to generate ripple signals of different frequencies, as shown in Figure 3, and the engine The higher the speed, the higher the frequency of the ripple signal. When the speed decreases, the frequency of the ripple signal will also decrease.

The conversion circuit 341 can filter the DC power signal from the conductive terminal 33 and use it as the power supply for driving the signal processing unit 32, the central control unit 35 and the display unit 37, and also the cigarette lighter 21 After the ripple signal on the output direct current is converted and processed, the engine speed is calculated, and a signal representing the engine speed is correspondingly output to the central control unit 35 .

The multi-stage switching switch 342 can be toggled to drive the conversion circuit 341 to use different built-in programs for various automobiles 2 with different cylinder numbers to calculate the engine speed of the automobile 2 with each cylinder number. The calibration knob 343 can be turned to fine-tune the rotational speed signal transmitted from the conversion circuit 341 to the central control unit 35, so as to facilitate the calibration of the rotational speed of automobile engines with the same number of cylinders but different brands. In this embodiment, the calibration button 343 is composed of a variable resistor, but the implementation is not limited thereto.

The central control unit 35 can receive and process the vehicle speed signal from the signal processing unit 32 and the engine speed signal from the conversion circuit 341 , and correspondingly output a display signal representing the vehicle speed and engine speed to the display unit 37 .

The hands-free speaker unit 36 includes a communication circuit 361 and a sound source output/receiver 362 arranged in the box body 31 and electrically connected to the central control unit 35 respectively. The communication circuit 361 can communicate wirelessly with the communication device 23. In this embodiment, the communication circuit 361 and the communication device 23 use the Bluetooth wireless transmission interface for communication transmission. sent bluetooth signal, and send the signal to the central control unit 35 after processing, the central control unit 35 can receive and process the signal and transmit a corresponding sound signal to the sound source output/receiver 362 to drive the sound source The output/receiver 362 amplifies and outputs the call sound of the other party. On the other hand, the sound source output/receiver 362 will also receive the surrounding sound, and correspondingly generate an answer signal to the central control unit 35, and the central control unit 35 will The communication circuit 361 is driven to convert and process the answering signal, and then send it to the communication device 23 through the Bluetooth wireless interface, so that the calling party can hear the user's talking voice. Since the bluetooth transmission technology is not the focus of the improvement of the new model, it will not be described in detail.

The display unit 37 includes a display mechanism 371 electrically connected to the central control unit 35 , and a brightness adjustment mechanism 372 embedded and exposed on the display mechanism 371 and electrically connected to the display mechanism 371 . The signal processing unit 32 is embedded and exposed outside the display mechanism 371 . In the present embodiment, the display mechanism 371 is a head-up display (HEADS UPDISPLAY, HUD), which can receive and process the display signal from the central control unit 35, and project it on the front windshield 22 to represent the current vehicle speed and engine speed. image 370, but during implementation, the types of the image 370 generated by the display mechanism 371 projected on the front windshield 22 are not limited to the above.

The brightness adjustment mechanism 372 has a light sensor 373 respectively embedded and exposed on the display mechanism 371 , and a brightness adjustment knob 374 that can be rotated. The light sensor 373 can automatically sense the change of light intensity, and drive the display mechanism 371 to adjust the brightness of the image 370 projected and formed on the front windshield. For example, when the external light is too bright, the light sensor 373 will drive the display mechanism 371 increases the brightness of the image 370 formed by it, so that the driver in the car can watch the image 370 clearly. The brightness adjustment button 374 can be used by the user to manually adjust the brightness of the image 370 formed by the display mechanism 371 .

When the vehicle speed detection device is used, the display mechanism 371 needs to be placed on the inner side of the front windshield 22 and located in the area directly in front of the steering wheel 23, and the conductive terminal 33 is electrically connected and inserted into the cigarette lighter 21. . By means of the image 370 projected directly on the front windshield 22 in front of the driver's seat by the display mechanism 371, the driver can directly watch the image 370 on the front windshield 22 in front of his line of sight while driving. And immediately know the current speed and engine speed.

In this embodiment, the data transmission between the display mechanism 371 and the central control unit 35 is carried out through a signal line 37, but during implementation, the data transmission between the display mechanism 371 and the central control unit 35 can also be designed in the form of wireless transmission , such as infrared transmission or bluetooth transmission, but the implementation is not limited thereto.

It is worth mentioning that when the vehicle speed detection device is assembled for the first time, or when it is disassembled from the originally assembled vehicle 2 and assembled in another vehicle 2, in view of the different cylinder numbers of each vehicle 2, There will be a difference between the engine speed and the frequency of the ripple signal in the output direct current. In order to make the engine speed value represented in the projected image 370 correct, after the assembly is completed, the user can first correspond to the cylinder of the car 2 and pull the switch 342 of the conversion unit 34 to drive the corresponding program action built in the conversion circuit 341, and then, when the engine is started and the car is in the neutral state, by stepping on the accelerator (not shown) while Turn the calibration button 343 to fine-tune the signal output from the conversion circuit 341 to the central control unit 35 until the engine speed value in the image 370 projected by the display mechanism 371 is approximately equal to the engine speed value on the instrument panel (not shown in the figure) , quite convenient.

In addition, when the vehicle speed detection device is implemented, it can also be designed to be electrically connected to a satellite signal gainer (not shown), so that when the signal processing unit 32 has poor satellite signal reception, it can pass through the gainer. Therefore, the signal processing unit 32 can clearly receive satellite signals.

As shown in Figures 2 and 4, the second embodiment of the vehicle speed detection device of the present utility model is substantially the same as the first embodiment, the difference is that the display mechanism 371 is assembled in the box body 31 and Partially exposed on the box body 31 , and can be projected on the front windshield 22 to form an image 370 , the light sensor 373 and the brightness adjustment button 374 of the brightness adjustment mechanism 372 are respectively embedded and exposed on the box body 31 . When the speed measuring device is in use, the box body 31 is directly arranged on the front windshield 22 in front of the driver's seat, so that the display unit 37 can project the image 370 on the front windshield 22 to provide the driver's vehicle speed and rotational speed information. .

As shown in FIG. 5 , the third embodiment of the vehicle speed detector of the present invention is basically the same as the second embodiment, the difference lies in the structural design of the box body.

In this embodiment, the box body 31 is designed as a rearview mirror with a rearview function, and can be directly installed on the original rearview mirror 24 in the automobile 2 to replace the function of the original rearview mirror 24 . The display mechanism 371 is assembled in the box body 31 and partially exposed on the front side of the box body 31 , and can project an image 370 on the front windshield 22 .

In view of the above, through the vehicle speed detection device, only the conductive terminal 331 of the plug-in unit 33 is electrically connected and plugged into the cigarette lighter 21, and the vehicle speed can be measured through the signal processing unit 32, and the use of The conversion unit 34 is designed to obtain the engine speed directly from the electric signal of the cigarette lighter 21, so that the assembly and use of the vehicle speed detection device is relatively convenient, and when the display unit 37 is connected to the central control unit 35 through the signal line 37 After connecting, it is only necessary to place the display mechanism 371 in an appropriate position for projection, so the user can assemble it by himself, and can be easily disassembled and moved to other cars for use. In addition, the display unit 37 can directly project data such as the current speed of the vehicle and the engine speed on the front windshield 22, which is located at the driver's horizontal viewing angle, so that the user can know the current speed and speed of the vehicle without shifting the line of sight. The engine speed is of great help to improve driving safety. In addition, the structural design of integrating the hands-free loudspeaker unit 36 capable of wireless communication with the communication device 23 into the box body 31 can simplify the space inside the car body and prevent the car from being damaged due to additional additional electrical devices. The clutter phenomenon can be generated, and because the vehicle speed detection device integrates functions such as head-up display, speed measurement and hands-free amplification, its market competitiveness can be increased. Therefore, can really reach the purpose of the utility model.

Claims (10)

1. A vehicle speed detection device, which is suitable for electrical connection and insertion on the cigarette lighter of the car and assembled on the inside of the front windshield, and includes a signal that can receive and process the global satellite positioning system and output to the current vehicle. The signal processing unit of the vehicle speed signal corresponding to the speed is characterized in that: the vehicle speed detection device also includes a detachable electrical connection plugged on the cigarette lighter and can receive the power signal output by the cigarette lighter. Connecting unit, a conversion unit that is electrically connected with the plug-in unit and can receive and process the power signal from the plug-in unit to output a speed signal corresponding to the engine speed, and can receive and process the vehicle speed signal from the signal processing unit and the speed signal of the conversion unit And corresponding to the central control unit that outputs the display signal, and the display unit that can display images on the front windshield. The display unit includes a device that can receive the display signal and project images representing the current vehicle speed and engine speed on the front windshield. A display mechanism, and a brightness adjustment mechanism that can adjust the brightness of the image projected by the display mechanism on the front windshield. 2. The vehicle speed detection device according to claim 1, characterized in that: the vehicle speed detection device further comprises a hollow box, and the signal processing unit, conversion unit and central control unit are respectively assembled in the box in vivo. 3. The vehicle speed detection device according to claim 2, characterized in that: the conversion unit includes a conversion circuit that is electrically connected to the plug-in unit and can process the power signal and output a speed signal corresponding to the engine speed, And a multi-stage switch that is exposed on the box body and is electrically connected to the conversion circuit is embedded, and when the switch is toggled, the conversion circuit can be driven to change the mode of receiving and processing the power signal and the corresponding output speed Signal. 4. The vehicle speed detection device according to claim 3, characterized in that: the conversion unit also includes a calibration button embedded and exposed on the box body and electrically connected to the conversion circuit, and when the calibration button When turned over, the engine speed value of the image projected by the display mechanism on the front windshield can be adjusted. 5. The vehicle speed detection device according to claim 1, wherein the brightness adjustment mechanism has a light sensor that can automatically sense the brightness of the outside world and drive the display mechanism to change the brightness of the projected image. 6. The vehicle speed detection device according to claim 5, wherein the brightness adjustment mechanism further has a brightness adjustment button which can be turned to drive the display mechanism to change the brightness of the projected image. 7. The vehicle speed detection device according to claim 2, characterized in that: the box body is a rearview mirror, and the display unit is partially exposed and assembled in the box body and can be projected on the front windshield produces this image. 8. The vehicle speed detection device according to claim 2, characterized in that: the vehicle speed detection device also includes a box assembled in the box and electrically connected to the central control unit, which can receive communication signals wirelessly and output corresponding The hands-free loudspeaker unit that receives the sound and sends a corresponding communication signal. 9. The vehicle speed detection device according to claim 8, characterized in that: the hands-free loudspeaker unit includes a communication circuit that is electrically connected to the central control unit and can receive and send communication signals, and is electrically connected to the central control unit. Audio output/receiver connected to output and receive sound. 10. The vehicle speed detection device according to claim 9, wherein the signal receiving and sending of the communication circuit adopts a Bluetooth wireless transmission interface.

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