CN201203533Y - EFI Gasoline Engine Management System Test and Diagnosis Instrument - Google Patents

Abstract

The utility model discloses a test and diagnosis instrument for the management system of an electric injection gasoline engine, which comprises a liquid crystal screen circuit, a built-in keyboard circuit, an ECU circuit, a signal conditioning circuit, a signal acquisition circuit, a power supply circuit and the like. The built-in keyboard/LCD interface provides users with a flexible gasoline engine sensor signal parameter setting mode, which can flexibly output the combined signal of gasoline engine sensors, and is suitable for gasoline engine ECU software logic debugging and fault testing.

Description

EFI Gasoline Engine Management System Test and Diagnosis Instrument

technical field

The utility model belongs to the technical field of testing and diagnostic instruments, in particular to a testing and diagnostic instrument for the management system of an electric injection gasoline engine.

Background technique

Whether it is the fault diagnosis and detection of vehicle engine ECU in the vehicle maintenance industry or the logic debugging of the ECU program by the development organization, it is necessary to provide the ECU with engine sensor signals under various working conditions. The structure of the ECU software is complex, and it is difficult to quantitatively debug its logic with the conventional static debugging method, and the actual vehicle test is affected by various parameters, so it is impossible to accurately evaluate the influence of a single signal change on the ECU control signal, and accordingly to the ECU software. Accurate evaluation and diagnosis are given for logical structure or faults.

The EFI gasoline engine management system test diagnostic instrument developed by the utility model can realize the flexible combination of sensor signals, provide signals of various working conditions of the engine, and meet the requirements of software logic debugging work of engine ECU or ECU fault diagnosis test. At the same time, the EFI gasoline engine management system test and diagnostic instrument is easy to operate and has good portability. It can drive the engine ECU to work without using a real engine, assist in ECU debugging and fault judgment, and can even simulate that it is difficult to reach under real vehicle conditions. It has a wide range of working conditions and is flexible and adjustable. It is a good ECU auxiliary development tool.

With the implementation of China's third-stage emission regulations (hereinafter referred to as China III) in Beijing and other places, the development of on-board emission diagnostic systems for monitoring motor vehicle emissions has become a top priority. The EFI gasoline engine management system testing and diagnostic instrument can be used for on-board fault diagnosis (OBD) system diagnostic test, and provides help for the development of on-board fault diagnosis (OBD) system.

Utility model content

The problem to be solved by the utility model is to provide a testing and diagnostic instrument for the management system of the electronic fuel injection gasoline engine, which can provide signals of various working conditions of the gasoline engine, realize the flexible combination of sensor signals, and satisfy the software logic debugging work of the gasoline engine ECU or The demand for ECU fault diagnosis test, etc.

A testing and diagnosing instrument for an electric injection gasoline engine management system is characterized in that it comprises a liquid crystal screen circuit (101), a keyboard circuit (102) and a testing and diagnosing instrument hardware circuit (103).

The test and diagnostic instrument is connected with the ECU of the gasoline engine through a connection harness (2), and the test and diagnostic instrument is connected with a host computer through a communication line (3).

The utility model has the following advantages:

This EFI gasoline engine management system test and diagnostic instrument can provide signals of various working conditions of the gasoline engine, realize the flexible combination of sensor signals, and meet the needs of gasoline engine ECU software logic debugging or ECU fault diagnosis testing.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Fig. 2 is a schematic block diagram of the liquid crystal screen circuit of the present invention.

Fig. 3 is a functional block diagram of the keyboard circuit of the present invention.

Fig. 4 is a functional block diagram of the hardware circuit of the testing and diagnostic instrument of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the principle block diagram of the present utility model, comprises EFI gasoline engine management system test diagnostic instrument (1), and gasoline engine ECU connection harness (2) and the communication line (3) with upper computer composition.

Connect the EFI gasoline engine management system test and diagnostic instrument (1) to the gasoline engine ECU through the connection harness (2), and the user can set the gasoline engine sensor signal parameter output mode through the LCD (101) and built-in keyboard (102) interface, and can Flexible output of combined signals of gasoline engine sensors for gasoline engine ECU software logic debugging and fault testing. At the same time, the EFI gasoline engine management system testing and diagnostic instrument (1) is connected with the upper computer through the communication line (3), and can display data and graphs.

Fig. 2 is a schematic block diagram of the liquid crystal screen circuit of the present invention. LCD screen FYD12864-0402B is a kind of 4-bit/8-bit parallel, 2-wire or 3-wire serial interface mode, which contains a dot matrix graphic LCD module with national standard first-level and second-level simplified Chinese characters; its display resolution The resolution is 128×64, and there are 8192 16*16 dot Chinese characters and 128 16*8 dot ASCII character sets built in. Utilizing the flexible interface mode and simple and convenient operation instructions of this module, a full-Chinese man-machine interactive graphical interface can be formed. It can display Chinese characters in 8×4 lines and 16×16 dot matrix, and can also complete graphic display.

Fig. 3 is a functional block diagram of the keyboard circuit of the present invention. The utility model adopts the non-encoded keyboard design. The PTM[3:0] of the MC9S12DP256B single-chip microcomputer is used as the input port, and the PORTK[3:0] is used as the output port, which is connected with the 4×4 keyboard.

Fig. 4 is a functional block diagram of the hardware circuit of the testing and diagnostic instrument of the present invention. The core microprocessor of the test and diagnostic instrument adopts 16-bit single-chip microcomputer MC9S12DP256B of Motorola Company. Design BDM interface with background debugging mode, power supply interface, reset circuit, input and output processing circuit. It has an interface with the LCD screen circuit and keyboard circuit of the peripheral.

The utility model EFI gasoline engine management system test and diagnostic instrument has been successfully used in the logic debugging and fault diagnosis test of gasoline engine ECU. ECU debugging work needs.

Claims (2)

1, a kind of electronic injection gasoline engine management system testing and diagnosing instrument, it is characterized in that: described testing and diagnosing instrument comprises liquid crystal display circuit (101), keyboard circuit (102) and testing and diagnosing instrument hardware circuit (103).

2, electronic injection gasoline engine management system testing and diagnosing instrument according to claim 1 is characterized in that: described testing and diagnosing instrument is connected by rat tail (2) with the ECU of gasoline engine, and described testing and diagnosing instrument is connected with host computer by connection (3).

Images