ECM power supply control circuit

Abstract

The invention relates to a power supply control circuit, which is used for solving the problem that the power supply control circuit of an engine control module cannot be controlled according to its own working condition after the electric lock is broken. Provided is an engine control module power supply control circuit, comprising a battery, an engine control module, an electric lock, a main power switch, and a delay power-off control circuit. The delay power-off control circuit comprises a first relay and a second relay. The electromagnetic coil of the first relay is connected between an ECMelectric lock signal access terminal and a circuit ground wire. The contact of the first relay and the electromagnetic coil of the second relay are connected in series between the positive electrodeof the battery and the ECM state signal output terminal, and the contact of the second relay is connected between the negative electrode of the battery and the ECM ground terminal. After the electriclock and the main power switch are successively disconnected, the battery still supplies power to the engine control module until the data storage of the engine control module and the cleaning of theDEF pipeline are completed, and then the battery is automatically disconnected from the power supply.

Description

technical field [0001] The present invention relates to a control circuit, more specifically, to a power supply control circuit of an engine control module. Background technique [0002] At present, construction machinery has higher and higher requirements for diesel engine exhaust emissions, especially in the European and American markets, requiring construction machinery entering this market to meet 4F emission standards. At present, most of the mainstream diesel engines meeting the 4F emission standard on the market use an after-treatment system to treat the exhaust gas. For engines with post-processing systems, after the ignition switch 5 (electric lock) is turned off, the whole machine still needs to continue to supply power to the engine control module 3 (ECM) and the post-processing system for a period of time, so that the ECM can store data and the post-processing system 4 Clean the DEF pipeline. [0003] In order to ensure the stability of the voltage and avoid in...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a power supply control circuit of the engine control module, so that when the electric lock is disconnected, the power supply control circuit of the existing engine control After opening, the power supply to the engine control module is automatically controlled by the working status of the engine control module

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