CN201805439U

CN201805439U - Portable vehicle diagnosis system

Info

Publication number: CN201805439U
Application number: CN201020560994XU
Authority: CN
Inventors: 付景枝; 王礼建
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2010-10-14
Filing date: 2010-10-14
Publication date: 2011-04-20
Anticipated expiration: 2020-10-14

Abstract

The utility model discloses a portable vehicle diagnosis system. The system comprises a Bluetooth interface converting device used for converting the signal of the vehicle diagnosis bus into the Bluetooth signal and transmitting to the diagnosis terminal. The Bluetooth interface converting device comprises a CAN bus interface module, a K bus interface module, a micro-processor, and a Bluetooth module, wherein the micro-processor is respectively connected with signals from the CAN bus interface module, the K bus interface module, the Bluetooth module. The utility model further simplifies the structure of the system by commonly using a plug by the CAN bus interface module and the K bus interface module, and adopting the micro-processor of the integrated K bus controller. Compared with the prior art, the utility model has advantages of wide adaptation, strong versality, simple structure, and low production cost.

Description

The portable vehicle diagnostic system

Technical field

The utility model relates to a kind of automotive diagnostic system, relates in particular to a kind of portable vehicle diagnostic system.

Background technology

Along with development of computer, used electronic control unit on the increasing automobile, this dynamic property to automobile, economy, fail safe and reliability etc. all are greatly improved, but this also makes auto repair diagnosis and the difficulty of fixing a breakdown how.For this reason, automobile production producer has added the fault self-diagnosis module in electronic control unit, performance in the car running process and fault parameter are stored, even can analyze and judge the technology status of automobile automatically, and can on Auto analyzer, show, be convenient to the quick fault location of maintenance personal.

Auto analyzer is matching used with the vehicle failure self-diagnosable system, and the terminal equipment that it is equivalent to the vehicle failure self-diagnosable system in essence plays the effect of man-machine interaction.Auto analyzer generally is specialized apparatus or PC etc., links to each other with the automobile bus interface by socket, thereby automobile is diagnosed.Special-purpose Auto analyzer is the same with the Auto analyzer of PC platform, and the expense height is connected with the vehicle diagnosis socket by cable when diagnosis, uses inconvenience, and does not possess portability, is not easy to promote.

Someone proposes by interface switching device the bus signals of vehicle electronic control unit to be converted to wireless signal, and for example Bluetooth signal, infrared signal etc. transfer to Auto analyzer.The applicant discloses a kind of intelligent network bridge that can make realization wireless data transmission between CAN bus and the Auto analyzer in a application for a patent for invention (application number is 201010211345.3) of application on June 25th, 2010, this bridge comprises CAN bus interface module, main control unit and bluetooth module, main control unit is connected with bluetooth module and CAN bus interface respectively, and can transmit data each other.When using this bridge, the CAN bus interface is linked to each other with the vehicle diagnosis interface, carry out wireless connections between bluetooth module and the Auto analyzer; Main control unit is monitored bluetooth module and CAN bus interface constantly, in case bluetooth module is received a complete Frame from Auto analyzer, main control unit just is forwarded to this Frame on the CAN bus by the CAN bus interface; In like manner, in case the CAN bus interface is received a complete Frame, main control unit just sends this Frame by bluetooth module, so that allow diagnostic equipment receive, has so just realized the wireless connections of Auto analyzer and automobile CAN-bus.Can make by this intelligent network bridge between the portable digital equipment of the CAN network of automotive interior and Auto analyzer or other bluetooth enable and realize wireless data transmission by blueteeth network, thereby enlarged the service range of Auto analyzer, the operation ease when having improved the auto repair diagnosis.But at present commonly used except the CAN bus in the automobile industry, also have the K bus.Above-mentioned intelligent network bridge is only applicable to use the automobile of CAN bus, and can't be used to use the automobile failure diagnosis of K bus, and versatility is not strong.

The utility model content

The purpose of this utility model is to overcome the defective of prior art, and a kind of portable vehicle diagnostic system of highly versatile is provided.

The utility model is by the following technical solutions:

A kind of portable vehicle diagnostic system, comprise the blue tooth interface conversion equipment, be used for that the vehicle diagnosis bus signals is converted to Bluetooth signal and transfer to diagnosis terminal, it is characterized in that, described blue tooth interface conversion equipment comprises CAN bus interface module, K bus interface module, microprocessor and bluetooth module, and microprocessor is connected with CAN bus interface module, K bus interface module, bluetooth module signal respectively.

Described CAN bus interface module comprises plug, CAN bus transceiver, the CAN bus control unit of signal connection successively, described K bus interface module comprises plug, K bus transceiver, the K bus control unit of signal connection successively, and CAN bus control unit, K bus control unit are connected with microprocessor signals respectively.

Preferably, described CAN bus interface module, the shared plug of K bus interface module.

When using the utility model, plug is inserted the vehicle diagnosis socket, microprocessor is monitored the type of identification vehicle diagnosis bus automatically, control CAN bus interface module or K bus interface module receive the vehicle diagnosis bus signals, and signal being transferred to diagnosis terminal by bluetooth module, diagnosis terminal can use the personal digital equipment of bluetooth enables such as mobile phone common on the market, PDA, palmtop PC.

The utility model is by comprising the blue tooth interface conversion equipment of CAN bus interface module and K bus interface module, expanded the scope of application of existing portable vehicle diagnostic system, improved the versatility of automotive diagnostic system, in addition by CAN bus interface module, the shared plug of K bus interface module, further simplify the structure of diagnostic system, reduced production cost.

Description of drawings

Fig. 1 is the structural representation of automotive interior electronic control unit;

Fig. 2 is the structured flowchart of portable vehicle diagnostic system described in the utility model;

Fig. 3 is the blue tooth interface device software flow chart of portable vehicle diagnostic system described in the utility model;

Fig. 4 is the software flow pattern of diagnosis terminal in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated:

Portable vehicle diagnostic system of the present utility model, as shown in Figure 2, comprise blue tooth interface conversion equipment and diagnosis terminal, wherein the blue tooth interface conversion equipment comprises plug, CAN bus transceiver, CAN bus control unit, K bus transceiver, microprocessor, bluetooth module.

In this embodiment, CAN bus interface module, the shared OBD-II standard plug of K bus interface module, the CAN bus transceiver uses the chip of model as PCA82C250, the model of CAN bus control unit is SJA1000, the model of K bus transceiver is TJA1020, the BC04 that bluetooth module adopts Chongqing golden goblet-national territory science and technology to produce.In this embodiment, having adopted model is the microprocessor of PIC18F24J11, this microprocessor internal is integrated 2 serial ports controllers, thereby can simplied system structure.CAN bus signals on the plug at first is transferred to CAN bus transceiver PCA82C250, arrives CAN bus control unit SJA1000 again, is transferred to microprocessor PIC18F24J11 by the parallel port at last; K signal on the plug at first is transferred to K bus transceiver TJA1020, directly links the serial ports of microprocessor PIC18F24J11 then, and this serial ports controller is used as the K bus control unit; Another serial ports of microprocessor PIC18F24J11 is connected with bluetooth module BC04.So just CAN bus, K bus and bluetooth are coupled together, can finish data mutual in bluetooth-K bus, bluetooth-CAN bus by microprocessor.

The utility model can use mobile phone, PDA, palmtop PC of bluetooth enable etc. as diagnosis terminal, the diagnostic software of original Auto analyzer is implanted into selected diagnosis terminal, and can make adaptive modification: rearrange as showing the essential factor screen correspondence that diminishes according to the difference of man-machine interface; Whether input does not have keyboard to import according to having trace ball, touch-screen etc. to do adaptability revision, also wants the dummy keyboard input where necessary; On interface, also original USB port driver will be changed into the driver of bluetooth.

The structure of existing automotive interior electronic control unit as shown in Figure 1, each control unit (for example control unit of engine, vehicle body control unit, ABS control unit, air bag control unit etc.) all inserts CAN bus or K bus, and can carry out data output by CAN bus or K bus interface socket.

When using portable vehicle diagnostic system of the present utility model to carry out vehicle diagnosis, earlier the OBD-II standard plug is inserted CAN bus or K bus interface socket, the diagnosis request is sent by the blue tooth interface of diagnosis terminal, received by the blue tooth interface conversion equipment, be forwarded to then on the ALCL Assembly Line Communication Link of automobile, by the electronic control unit of being diagnosed in the automobile is received.The electronic control unit feedback diagnostic data of being diagnosed is transferred to mobile phone, thereby realizes whole diagnostic procedure to ALCL Assembly Line Communication Link after blue tooth interface is converted to blue-teeth data.In the blue tooth interface conversion equipment, microprocessor is being monitored the data on CAN/K bus and the bluetooth always, after a complete Frame on the CAN/K bus received, microprocessor just sent to bluetooth module to them, sends to diagnosis terminal by bluetooth module again; Bluetooth module sends to microprocessor to the diagnosis terminal data of receiving, after microprocessor obtains a complete Frame, just by forwarding on the corresponding bus.So just finish the conversion of diagnostic data between automobile bus and diagnosis terminal.In this embodiment, the software flow of blue tooth interface conversion equipment as shown in Figure 3.Diagnosis terminal is carried out different functional modules respectively according to the input request and in conjunction with state at that time, as electronic control unit choose, read failure sign indicating number, storage, diagnostic result inquiry etc., and content corresponding shown on screen, the software flow of diagnosis terminal is as shown in Figure 4.

Compared to existing technology, Portable vehicle diagnosis system of the present utility model is by having integrated the blue tooth interface conversion equipment of CAN bus interface module and K bus interface module, applicable in the market most automobiles, thereby expanded the scope of application, improved the versatility of automotive diagnostic system, the utility model also has simple in structure, the advantage that production cost is low.

Claims

1. portable vehicle diagnostic system, comprise the blue tooth interface conversion equipment, be used for that the vehicle diagnosis bus signals is converted to Bluetooth signal and transfer to diagnosis terminal, it is characterized in that, described blue tooth interface conversion equipment comprises CAN bus interface module, K bus interface module, microprocessor and bluetooth module, and microprocessor is connected with CAN bus interface module, K bus interface module, bluetooth module signal respectively.

2. portable vehicle diagnostic system according to claim 1, it is characterized in that, described CAN bus interface module comprises plug, CAN bus transceiver, the CAN bus control unit of signal connection successively, described K bus interface module comprises plug, K bus transceiver, the K bus control unit of signal connection successively, and CAN bus control unit, K bus control unit are connected with microprocessor signals respectively.

3. as portable vehicle diagnostic system as described in the claim 2, be characterised in that described CAN bus interface module, the shared plug of K bus interface module.

4. as portable vehicle diagnostic system as described in the claim 3, it is characterized in that described plug is the OBD-II standard plug.

5. as portable vehicle diagnostic system as described in any one of the claim 2-4, it is characterized in that described K bus control unit is integrated in the described microprocessor.