Circuit fault simulation device of vehicle engine management system

Abstract

The invention discloses a circuit fault simulation device of a vehicle engine management system. The circuit fault simulation device comprises a plurality of sets of testing circuits. One end of each set of testing circuit is connected with an ECU (electronic control unit) while the other end of the same is connected with the wiring harness end of a sensor in an engine or the wiring harness end of an actuator. Each set of testing circuit comprises a mode selection switch, a circuit fault type selection switch and a slide rheostat and resistor mode selection switch. Multi-gear selection switches are adopted and combined with related fault circuits integrated inside the switches, so that rapid and safe simulation on common power supply short circuit, ground short circuit and signal open-circuit faults is realized, simulation on reasonable faults of sensor signals and functional faults of actuator signals can be also realized, matching and developing efficiency of an OBD (on-board diagnostics) system is greatly improved, and safety in circuit fault simulation is improved.

Description

technical field [0001] The invention relates to the fault diagnosis of an automobile engine, and specifically belongs to a circuit fault simulation device for an automobile engine management system. Background technique [0002] The engine management system (EMS) includes a variety of components, such as various sensors (pressure sensors, temperature sensors, etc.) and actuators (such as fuel injectors), etc., and the circuit fault detection of these components belongs to the online diagnostic system (OBD ), the current vehicle after-sales maintenance service also strongly relies on the relevant fault information provided by the OBD system. Therefore, the matching development of the OBD system, especially the matching development of the circuit fault diagnosis of related components, is an important content of the matching development of the engine management system. In order to ensure that the OBD system can effectively detect the relevant circuit faults of each component, i...

AI Technical Summary

Problems solved by technology

Due to the different wiring harness configurations of different models and engine models, there are many schematic diagrams of the wiring harness. Incorrect damage to the modules of the electronic controller and associated sensors (actuators)

At the same time, for the simulation of the rationality fault of the relevant sensor signal or the functional fault of the actuator, it is necessary to use additional equipment such as a resistance box, which is inconvenient and time-consuming to operate.

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