Automobile ECU fault detection system and detection method thereof

Abstract

The invention discloses an automobile ECU fault detection system and a detection method thereof. The system comprises an automobile ECU fault detection box, an ECU, a connecting cable, a crankshaft position sensor simulator and an automobile diagnosis ECU decoder, wherein the automobile ECU fault detection box comprises a box body, and the box body is provided with an ECU output signal indicationcircuit, an ECU sensor analog input circuit, a CAN bus connecting circuit and a power supply circuit; the ECU output signal indication circuit is provided with a signal access end and a light emittingdiode, the signal access end is connected with the ECU through the connecting cable, and the ECU output signal indication circuit displays an output signal of the ECU through the light emitting diode; the ECU is also connected with the crankshaft position sensor simulator; the ECU sensor analog input circuit is provided with an adjustable potentiometer, the adjustable potentiometer outputs sensoranalog signals to the ECU, and the ECU is connected with the automobile diagnosis ECU decoder through the CAN bus connecting circuit. The system is used for troubleshooting of the ECU and related circuits thereof, and is simple in structure, easy to manufacture and high in universality.

Description

technical field [0001] The invention relates to the technical field of automobile maintenance, in particular to an automobile ECU fault detection system and a detection method thereof. Background technique [0002] Like ordinary computers, automotive ECU is composed of microprocessor MCU, memory, input / output interface (I / O), analog-to-digital converter (A / D), and large-scale integrated circuits such as shaping and driving. To use a simple sentence to describe it is "ECU is the brain of the car". [0003] The voltage working range of ECU is generally 6.5-16V, and there is a voltage stabilizing device at the key point inside. The static working current of ECU is usually between 0.05-0.4A, and the working temperature is -40℃~80℃. The CPU is the core part of the ECU, which has the functions of calculation and control. When the engine is running, it collects the signals of various sensors, performs calculations, and converts the calculation results into control signals to contr...

AI Technical Summary

Problems solved by technology

[0006] The defect of prior art is, the detection of ECU is to transmit the signal of analog sensor to automobile ECU through microprocessor or single-chip microcomputer, and microprocessor or single-chip microcomputer needs to compile corresponding control program, and the internal program of its automobile ECU of different brands of automobiles It is different, so the signal of the simulated sensor is sent to the car ECU for testing through a microprocessor or a single-chip microcomputer. For maintenance personnel, its versatility is not high, and the use of a microprocessor or a single-chip microcomputer leads to complex structure and high cost. , there is a lack of an automotive ECU fault detection system and its control method, which is used for troubleshooting of automotive ECUs and related circuits, and has a simple structure, low cost, and high versatility

Images