KR20010113194A - Interface aqpparatus for remote diagnosis of vehicle - Google Patents

Abstract

The present invention relates to an interface device for remote diagnosis of a vehicle, and a communication standard conversion control for transmitting information received from each electronic controller or a dedicated diagnostic apparatus mounted in a vehicle to a communication standard after converting the communication standard to a remote place through a cellular / PCS or a wireless LAN. It relates to an interface device. The present invention is equipped with an interface circuit for OBD II to communicate data for fault diagnosis from each electronic controller or a dedicated diagnostic device mounted on a vehicle according to the communication standard used in OBD II, and process and store the data and information received therefrom. It is a device with an interface circuit for transmitting it to a remote place through a cellular / PCS or a wireless LAN. In addition, by receiving information from a remote location through a cellular / PCS or wireless LAN, it is possible to download the data for the vehicle tuning to each electronic controller or a dedicated diagnostic device display and alarm device to inform the driver of each information and status And a keypad input device. Therefore, the present invention can be diagnosed more quickly in the event of an automobile, and in particular, when an abnormality occurs in a remote area without a repair shop, a diagnosis and maintenance guide can be easily received, thereby providing an effect capable of safe driving and preventing an accident of the automobile.

Description

Interface aqpparatus for remote diagnosis of vehicle

The present invention relates to an interface device for remote diagnosis of a vehicle, and converts a communication standard after converting a communication standard after processing information received from each electronic controller or a dedicated diagnostic device installed in a vehicle to a remote place through a cellular / PCS or a wireless LAN. It relates to a control interface device.

As the electronics of the vehicle are accelerated, the form of diagnosis / repair has also changed a lot due to the increase in the number of vehicles. And, as the structure and function of the vehicle is complicated, the diagnostic time is increased. Accordingly, the technician has developed a form of diagnosing several devices at the same time by inserting a diagnostic plug of a diagnostic device provided in a repair shop in a vehicle in a manner that the technician checks each vehicle one by one.

In general, each electronic controller or dedicated diagnostic device installed in a vehicle uses communication standard (J1850) or ISO standard ISO9142-2 communication standard used in OBD II (On board diagnostic controller II) established by SAE (Society Automotive Engineering). Exchange information with an external device.

In the present invention, reference to the general RS232C or PCMCIA is not considered necessary, but will briefly refer to the communication standards used in automobiles.

SAE J1850 sets out the main requirements of two areas: the physical layer and data link areas of automotive data communications. The purpose of this regulation is to define a minimal set of automotive data communications, allowing for cost savings from simple applications and flexibility in complex applications.

Basically, automobile data communication network is defined in three ways as follows. Class A (Low speed body wire and control function), Class B (Data communication between other systems), Class C (High speed real time control). J1850 is defined as Class B type communication network.

On the other hand, the requirements of the physical layer define the physical characteristics required for data communication, and represent the transmission path in the medium for service to the upper layer and the physical interconnection relationship for smoothing it. That is, the configuration of the transmission path is a single wire voltage drive method using a single random wire, and a dual wire voltage drive configured using a twist wire. It is composed of wire voltage drive type and balanced current drive type. Data transmitted through these transmission paths should consider the following attributes.

(1) Bit and mark definition

(2) Network media

(3) Receiver / transmitter characteristic

(4) Network wake-up

(5) Failure mode

(6) Error detection

(7) Diagnostic consideration

(1) Bit and mark definition

The data bus has two states of active / passive, and a recognition method in a transmission path occurs at a rising edge and a falling edge. In other words, the rising edge changes from the passive state to the active state and vice versa. In addition, the encoding method of the transmission path uses a pulse width modulation (PWM) method or a variable pulse width modulation (VpW). 1 shows a PWM encoding scheme. As shown in Fig. 1, the transmission signal is synchronized by the frequency clock according to the specified time of Tp3. Figure 2 shows the start of the transmission data, after the last message of the recognition data for Tp5 after the rising edge is kept active for Tp7 to generate the first data bit.

(2) Network media

The physical media format of the transmission path and the configuration method as described above are composed of a single wire voltage drive method using a single random wire, a dual wire voltage drive using a twisted wire, and a balanced current drive method.

(3) Receiver / transmitter characteristic

3 shows a transmission and reception circuit diagram. This represents the three types of bus interfaces described in item (2). Wired-OR transfer of transmission zones allows more than one device to be transmitted simultaneously. In other words, the active state of one device takes precedence over the inactive state of the other device. This means that two or more devices are competing with each other on the bus, and the higher priority is addressed first. It basically consists of clock signal for synchronizing with input / output paths (Rx, Tx) of data, and signal generation part for detecting and informing upon data collision. In addition, this allows more than one device to transmit at the same time, and transmits the high priority as it is during data collision, and the low priority inhibits the transmission so that data communication can be performed smoothly even if a data collision occurs.

(4) Network wake-up

This is a regulation to reduce the power loss when the transmission line is not active. The transmission medium enters the sleep state after about 500ms after the transmission stops, and when the transmission is started again, it is returned to normal within 1ms. have.

(5) Failure mode

It defines the countermeasures for electrical and electronic troubles caused by transmission lines. That is, when an error occurs in the power supply, when the transmission line is shorted or opened, it is for minimizing the loss of data when an electronic failure occurs around the transmission line.

(6) Error detection

This is to detect when the data is transformed or the data format is changed due to external causes during transmission. Temporary interference can restore data but otherwise generates an error signal.

(7) Diagnostic consideration

This is a rule to enable communication with external devices that use the J1850 communication standard, such as "off-board" diagnostic devices.

Meanwhile, the requirements of the data link layer are defined in SAE / J1850 in accordance with the open structure recommended by ISO as a regulation on error detection and recovery procedures in data communication. It is mainly related to the transmission message format. Message start format, message length, message end format, and bit format for error detection are defined. In particular, there is a method for properly communicating when multiple simultaneous accesses to one node, that is, when contention occurs.

The recent increase in automobiles can be said to be explosive as personal necessities. In addition, the breakdown and repair of the vehicle is also increasing, which is increasing as the type of electronic controller mounted on the vehicle increases.

However, the maintenance center and advanced technicians for diagnosis and repair are far short of the increase in the number of automobiles. As a result, a lot of time is delayed during the inspection and repair of the car, and users do not make a preliminary diagnosis by requesting a specialized shop other than the regular inspection. Previously, the mechanics or users could diagnose and repair by visual or sound when the machinery was the center, but now the electronic equipment is installed so that the cause and repair method can be done by the previous method. This is because advanced diagnostic devices must be used. Because of this, there is a problem that can not be accurately repaired in a small maintenance industry can not be accurately diagnosed.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to receive the vehicle status information for each vehicle through a wireless network, using the SAE standard OBD II communication standard, it is possible to obtain expert or advanced equipment. By providing accurate information through the analysis and processing the diagnostic information, it is possible to repair the vehicle by providing the information to the repair shop or the vehicle user, and to provide a communication conversion interface device for transmitting / receiving the tuned data bonded to the state of each vehicle. have.

1 is a diagram of a PWM encoding method for explaining a conventional vehicle remote diagnostic apparatus,

2 and 3 are views for explaining a conventional vehicle remote diagnosis device,

4 is a block diagram of an interface device for remote diagnosis of the vehicle according to the present invention;

5 is a diagram for explaining a memory data structure of the present invention;

<Description of the symbols for the main parts of the drawings>

200: microcontroller 210: second interface circuit

220: compression / compression block 230: first interface circuit

240: A / D, D / A Block 250: Keypad Input Buffer

260: keypad 270: memory

280: alarm device. 290: display device drive circuit

295 display device.

In order to achieve the above object, a remote diagnosis device for a vehicle of the present invention includes a first interface circuit for receiving vehicle diagnosis information from a vehicle diagnostic device in a vehicle remote diagnosis device having a vehicle diagnostic device for diagnosing a vehicle. A microcontroller that receives vehicle diagnostic information from a first interface circuit and transmits and receives data to a remote location for performing remote diagnosis of the vehicle, and compresses / processes the vehicle diagnostic information data according to a control signal applied from the microcontroller. And a second interface circuit for interfacing the data processed from the compression / decompression block with an external radio terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of a remote diagnosis interface device. 4 shows a cellular / PCS, a wireless LAN 300, a second interface circuit 210, a compression / decompression block 220, a first interface circuit 230, an A / D, and a D / A block. 240, a microcontroller 200, a keypad input buffer 250, a keypad 260, a memory 270, an alarm device 280, a display device drive circuit 290, and a display device 295.

Referring to the operation of the remote diagnosis interface device of the vehicle of the present invention having such a configuration as follows.

The vehicle 100 includes a vehicle controller (not shown) or a vehicle diagnostic apparatus to periodically check and diagnose a state of the vehicle. Vehicle status information and signals from the vehicle controller or the vehicle diagnostic apparatus that provide diagnostic information through the interface device are read using the first interface circuit 230, that is, the OBD II communication interface circuit. Vehicle state information input from the first interface circuit 230 is transmitted to the microcontroller 200. In addition, the analog signal of the vehicle state information input from the vehicle is input through the A / D, D / A (240) block, the signal is processed and transmitted to the micro-controller (200). The microcontroller 200 processes the received signal into a form necessary for transmission and then applies it to the compression / decompression block 220. The compression / decompression block 220 compresses an input signal using digital signal processing (DSP). Information compressed by the compression / decompression block 220 is input to the PCMCIA / RS232 interface circuit 210 for communicating with the PCMCIA / RS232 port. Cellular / PCS, WLAN 300 is provided with a PCMCIA / RS232 port to interface with the outside. That is, information is transmitted to a digital control unit (not shown) of a logic circuit through a PCMCIA / RS232 interface circuit 210 through a communication port for an external interface of the cellular / PCS terminal and the wireless LAN 300. The digital controller transmits vehicle status information to a remote location for remote diagnosis / management of the vehicle.

On the other hand, the information transmitted from the remote place is input through the cellular / PCS port. The input information is again transmitted to the compression / decompression block 220 through the PCMCIA / RS232 interface circuit 210. The compression / decompression block 220 decompresses the transmitted information using digital signal processing (DSP) and then transmits the decompressed block to the microcontroller 200. The microcontroller 200 decrypts the transmitted information and transmits the data to the electronic controller or the dedicated diagnostic apparatus or downloads the data. Then, the transmitted information is applied to the display drive circuit 290 as necessary. The display drive circuit 290 provides a driving force for displaying information applied to the display device 295. In addition, the microcontroller 200 notifies the information transmitted to the user by generating an alarm sound through the alarm device 280. As shown in FIG. 5, the memory 270 not only has a built-in interface device operation assistance program, but also stores diagnostic information of a vehicle periodically collected or collected when an abnormality occurs. The diagnostic information is stored by setting specific risk values according to the risk directness and status of each part. Through this structure, data is stored in the interface device for operating the diagnostic information in a simple manner by notifying the user when the sum of the risk directivity is more than the sum of the risk directivity by using the information space having low importance when the memory 270 is insufficient. The head stores the type of information sent, and the STX subclasses the status of the information sent. The data stores various state information, and the parity stores parity bits. Risk levels are stored according to vehicle location and condition. The keypad 260 is an input device for a user, and is used as a necessary input device such as setting of each mode, storing / deleting data, and requesting / stopping diagnosis. In particular, the diagnostic mode of each mode can be set to automatic / manual, and in the automatic mode, the sum of risk directness when any condition (for example, periodic time, any abnormality of diagnostic information in the internal memory occurs) When the time is over, it sends / receives diagnosis and diagnosis information periodically. In manual mode, it sends / receives diagnosis and diagnosis information only when requested by user. The keypad 260 transmits and receives data with the microcontroller 200 through the keypad input buffer 250.

As described above, the vehicle remote diagnosis interface device of the present invention can be diagnosed and tuned through a communication network without having to have a direct repair shop if the vehicle status is checked and diagnosed from a remote place through the Internet network to utilize diagnostic information. Therefore, a more rapid diagnosis is possible, and in particular, when an abnormality occurs in a remote area without a repair shop, the diagnosis and maintenance guide can be received, and thus the safety operation and accident prevention of the vehicle can be made possible.

Claims (7)

In the remote diagnosis device for a vehicle having a vehicle diagnostic device for diagnosing the vehicle, A first interface circuit for receiving vehicle diagnostic information from the vehicle diagnostic apparatus; A microcontroller that receives vehicle diagnostic information from the first interface circuit and transmits and receives data to a remote location for performing remote diagnosis of the vehicle; A compression / compression block for signal processing vehicle diagnostic information data according to a control signal applied from the microcontroller; And a second interface circuit for interfacing data processed from the compression / decompression block to an external wireless terminal. The method of claim 1, wherein the first interface circuit An automotive remote diagnostic interface device, characterized by an OBD II communication interface circuit. The method of claim 1 or 2, wherein the second interface circuit And the vehicle information data from the compression / cancellation block is transmitted to the wireless terminal using a PCMCIA / RS232 interface circuit. 4. The wireless terminal of claim 3, wherein the wireless terminal An apparatus for remotely diagnosing a vehicle, comprising at least one of a cellular phone, a PCS, and a wireless LAN. The method of claim 1, wherein the compression / release block is An apparatus for remotely diagnosing a vehicle, wherein the input information is compressed / cancelled using a DSP method. The method of claim 1, wherein the microcontroller And a display device for downloading the information data applied from the wireless terminal and displaying the information data so as to be recognized by the user, and an alarm device for transmitting a predetermined alarm sound. The method of claim 1, wherein the microcontroller And a memory for storing the vehicle information data detected periodically and the vehicle information data detected when an abnormality occurs for a predetermined period of time.