Control method for engine electric heating type catalytic converter

Abstract

The invention provides a control method for an engine electric heating type catalytic converter. The control method is used for accelerating rapid ignition of a catalyst of a vehicle engine in a coldstart stage and a cold machine stage, so that reasonable and effective control over gas emission is achieved. The control method comprises the following steps that an engine control unit controls a power supply of the electric heating type catalytic converter to be on or off through a relay, and when electric heating is required, the engine control unit performs instrument checking according to the start and stop condition of the engine to control the electric heating time of the electric heating type catalytic converter. After receiving a signal for starting the engine, the engine control unit firstly determines either start this time is cold machine start or warm machine start, if the startup is cold machine start, the engine control unit checks a preset cold machine electric heating instrument based on the ambient temperature and outputs the corresponding time length of the electric heating of the catalytic converter; and if startup this time is warm machine startup, the engine control unit checks a warm machine electric heating instrument based on the engine down time and the ambient temperature and outputs the corresponding time length of electric heating of the catalytic converter.

Description

technical field [0001] The invention belongs to the technical field of engine emission control, and is a concrete realization of the catalyst light-off control strategy of the engine emission control system, and is especially suitable for the emission control of the gasoline engine system. Background technique [0002] The catalyst light-off of the traditional vehicle engine cold start or cold engine stage mainly relies on the heat of the exhaust gas after the engine starts to heat the catalyst, and the engine control unit ECU changes the speed increase or delays the ignition angle to improve the light-off effect of the catalyst . Due to the poor timeliness of light-off, the above-mentioned methods cannot realize the catalytic conversion of emissions during the cold start stage. At the same time, due to the adoption of high-speed or delayed ignition angle emission reduction strategies for cold starts, the problem of increased fuel consumption has arisen. Contents of the in...

AI Technical Summary

Problems solved by technology

Due to the poor timeliness of light-off, the above-mentioned method cannot realize the catalytic conversion of emissions during the cold start phase. At the same time, due to the adoption of a cold start emission reduction strategy with high speed or delayed ignition angle, the problem of increased fuel consumption has been brought about.

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