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A kind of control method of egr valve of diesel engine

A technology of EGR valve and control method, which is applied in engine control, electrical control, fuel injection control, etc., can solve the problems of EGR valve control accuracy drop, and achieve the effect of increasing work reliability and control accuracy

Active Publication Date: 2020-08-21
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology

[0004] The invention provides a control method for an EGR valve of a diesel engine, which solves the problem that the zero point of the EGR valve is affected by carbon deposits and high-temperature exhaust gas to drift during the use of the existing diesel engine EGR valve, resulting in a decrease in the control accuracy of the EGR valve, and can improve EGR. The control accuracy of the valve increases the working reliability of the EGR valve

Method used

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  • A kind of control method of egr valve of diesel engine
  • A kind of control method of egr valve of diesel engine
  • A kind of control method of egr valve of diesel engine

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Embodiment Construction

[0045] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0046] For the EGR valve of the current engine, it is easy to cause zero drift and control accuracy drop due to carbon deposits and high-temperature exhaust gas. The invention provides a method for controlling the EGR valve of a diesel engine. The first self-learning is performed by controlling the EGR valve when the power is turned on, and self-cleaning and conventional self-learning are performed on the EGR valve when the power is turned off, so that the full-close position and the full-open position of the EGR valve can be adjusted accordingly. The zero point position is kept accurate, which solves the problem that the zero point of the EGR valve of the existing diesel engine EGR valve drifts due to carbon dep...

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Abstract

The invention provides a method for controlling an EGR valve of a diesel engine. The method comprises the following steps that 1, after an ECU of the diesel engine is electrified, whether the EGR valve undergoes first-time self-learning or not is judged, and if not, whether the EGR valve conforms to the condition of activating the first-time self-learning or not is judged; 2, in the set time, if an ignition key is in an ON gear and an accelerator pedal is trod to the set frequency, the first-time self-learning is activated; 3, when the ignition key is in an OFF gear, self-cleaning is carried out if the EGR valve conforms the self-cleaning condition, and otherwise, self-cleaning is finished; and 4, after the EGR valve is self-cleaned, the EGR valve undergoes conventional self-learning. According to the method, the control precision of the EGR valve can be improved, and the working reliability of the EGR valve is improved.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a method for controlling an EGR valve of a diesel engine. Background technique [0002] EGR (Exhaust Gas Recirculation) is exhaust gas recirculation, that is, the exhaust gas from the engine is reintroduced into the intake pipe and mixed with fresh gas to enter the combustion chamber for combustion. The EGR valve is installed on the engine to control the amount of recirculated exhaust gas entering the intake system. With the continuous upgrading of emission regulations, the EGR valve needs to precisely control the amount of exhaust gas entering the engine. Specifically, the opening degree of the EGR valve is adjusted by the ECU (Electronic Control Unit), so as to precisely control the amount of exhaust gas entering the engine. In this way, the exhaust gas participates in the combustion to reduce the temperature of the combustion chamber, improve the combustion environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D41/24F02M26/49F02M26/50
CPCF02D41/0077F02D41/2441F02D41/2451F02M26/49F02M26/50
Inventor 张焕岩吴磊杨越李杰肖海云蔡亚程剑峰葛娟娟
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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