Air-fuel ratio control method and device

A control method and technology of air-fuel ratio, applied in fuel injection control, electrical control, engine control, etc., can solve problems such as engine air-fuel ratio fluctuation, achieve precise air-fuel ratio control, and reduce fluctuations.

Active Publication Date: 2021-12-28
CHERY AUTOMOBILE CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in related technologies: near the exhaust temperature threshold, the air-fuel ratio of the engine will fluctuate greatly

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0055] An embodiment of the present application provides an air-fuel ratio control method, which can be executed by an ECU (Electronic Control Unit, electronic control unit) of a vehicle, such as figure 1 As shown, the air-fuel ratio control method includes the following steps:

[0056] S101. Obtain the target air-fuel ratio and the current intake air volume corresponding to the current working condition of the engine, and calculate the theoretical fuel injection volume based on the current intake air volume and the target air-fuel ratio;

[0057] S102. Obtain the signal of the front oxygen sensor, perform a first correction to the theoretical fuel injection quantity based on the signal of the front oxygen sensor and the target air-fue...

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Abstract

The invention discloses an air-fuel ratio control method and device, and relates to the technical field of engine control. The method includes: acquiring a target air-fuel ratio and a current intake air amount corresponding to a current operating condition of an engine, and calculating the air-fuel ratio based on the current intake air amount and the target air-fuel ratio. Theoretical fuel injection quantity; obtain the signal of the front oxygen sensor, and make the first correction to the theoretical fuel injection quantity based on the signal of the front oxygen sensor and the target air-fuel ratio, and obtain the corrected fuel injection quantity; obtain the signal of the rear oxygen sensor, based on the rear oxygen sensor The signal of the sensor and the target air-fuel ratio make a second correction to the corrected fuel injection quantity to obtain the actual fuel injection quantity; based on the actual fuel injection quantity, the engine is controlled to inject fuel. The air-fuel ratio control method and device provided by the present invention can effectively reduce the fluctuation of the air-fuel ratio.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to an air-fuel ratio control method. Background technique [0002] The air-fuel ratio of the engine refers to the ratio between the air mass and the fuel mass in the mixture sucked into the engine. The size of the air-fuel ratio will affect the power, economy and the content of pollutants in the exhaust gas of the engine. The best economy and the least air pollution can be obtained when the fuel is completely burned, and the air-fuel ratio when the fuel is completely burned is the theoretical air-fuel ratio. When the fuel is completely burned, the amount of pollutants (carbon monoxide, nitrogen oxides, etc.) in the exhaust gas is minimal, so it is necessary to control the actual air-fuel ratio of the engine to be close to the theoretical air-fuel ratio. [0003] In related technologies, an oxygen sensor is generally added to the intake pipe to check the concentration of oxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/30F02D41/22
CPCF02D41/1475F02D41/1441F02D41/1454F02D41/30F02D41/22
Inventor 李树宇曹广富
Owner CHERY AUTOMOBILE CO LTD
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