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Engine air fuel ratio control method and engine air fuel ratio control device

A control method and technology of air-fuel ratio, applied in engine control, machine/engine, fuel injection control, etc., can solve problems such as affecting measurement accuracy, inability to accurately adjust the uniformity of mixture of each cylinder, sensor drift surface, etc.

Inactive Publication Date: 2020-04-28
WEICHAI POWER CO LTD
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Problems solved by technology

[0003] Since this type of sensor needs to measure the content of gas components in the exhaust gas, the working environment is harsh and the service life is relatively short, and the corrosive gas in the exhaust gas will also cause the sensor to drift or dirt on the surface will affect the measurement accuracy
In addition, for multi-cylinder engines, because the oxygen sensor is installed on the exhaust manifold, it can only measure the average value of the air-fuel ratio of each cylinder, and cannot determine the real-time air-fuel ratio of each cylinder, so that the uniformity of the mixture gas of each cylinder cannot be accurately adjusted

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  • Engine air fuel ratio control method and engine air fuel ratio control device
  • Engine air fuel ratio control method and engine air fuel ratio control device
  • Engine air fuel ratio control method and engine air fuel ratio control device

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[0020] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0021] The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein and in the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as use...

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Abstract

The invention discloses an engine air fuel ratio control method and an engine air fuel ratio control device. Each cylinder of an engine is provided with an ignition coil. The engine air fuel ratio control method comprises the following steps of collecting a voltage change waveform of a secondary coil of the ignition coil for each cylinder after controlling ignition of the ignition coil of the cylinder; judging an air fuel ratio deviation of the cylinder by means of the voltage change waveform; and adjusting a fuel injection amount of the cylinder according to the air fuel ratio deviation, wherein the air fuel ratio of the cylinder returns to normal. After the ignition coil arranged on some cylinder is ignited, the air fuel ratio deviation of the cylinder is judged by detecting the voltagechange waveform of the secondary coil of the ignition coil, so that the fuel injection amount of the cylinder is adjusted. On a basis of not changing the mechanical structure of the engine and not increasing hardware, as the cylinders are measured and adjusted separately, a purpose that mixed gas of each cylinder is uniform can be achieved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method and device for controlling the air-fuel ratio of an engine. Background technique [0002] At present, the closed-loop control method of the air-fuel ratio of the engine is mainly based on the closed-loop control method of the gas engine with the oxygen sensor. That is, the oxygen content in the exhaust gas is detected by the oxygen sensor installed on the exhaust manifold, and then the air-fuel ratio of the engine is determined according to the oxygen content, and the injection amount of air or gas is adjusted according to the comparison result between the air-fuel ratio and the set value, so that The engine achieves the ideal air-fuel ratio. [0003] Since this type of sensor needs to measure the content of gas components in the exhaust gas, the working environment is harsh and the service life is relatively short, and the corrosive gas in the exhaust gas will also cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D41/00
CPCF02D41/14F02D41/008
Inventor 马海明鲁成赵宏恩
Owner WEICHAI POWER CO LTD
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