Device for controlling air-fuel ratio

Abstract

The invention provides a device for controlling an air-fuel ratio, which comprises an air-fuel ratio target value setting module, an air-fuel ratio detection module, a comparison module, a controller module and an execution module, wherein, the air-fuel ratio target value setting module determines the air-fuel ratio of a fuel power generation internal-combustion engine according to the working conditions of the internal-combustion engine; the air-fuel ratio detection module detects the air-fuel ratio actual value under the current working condition of the internal-combustion engine; the comparison module compares the air-fuel ratio actual value with the air-fuel ratio target value and sends the comparison results to the controller module; the controller module outputs the control signals to the execution module; and the execution module regulates the air flow and fuel flow in the main fuel pipe. The device further comprises a methane concentration sensor unit, an exhaust gas oxygen sensor feedback unit and a power feedback unit; wherein, the comparison results of the comparison module are modified by the methane concentration sensor unit, the exhaust gas oxygen sensor feedback unit and the power feedback unit and further sent to the controller module for treatment. The invention has the characteristics of timely detection, accurate control, energy conservation, environment friendliness, high efficiency and the like.

Description

technical field [0001] The invention relates to the field of gas-fired internal combustion engines, in particular to an air-fuel ratio control device for internal combustion engines. Background technique [0002] In the prior art, the air-fuel ratio refers to the weight ratio of the air sucked in during the intake stroke of the engine to the fuel. The air-fuel ratio is an important parameter when the engine is running, and it is a performance parameter that has a great impact on combustion exhaust emissions, engine power and economy. For example, in a gasoline internal combustion engine, when gasoline and air are mixed for combustion, too much or too little air cannot make the gasoline burn effectively, that is, the combustion is not complete. Therefore, the air-fuel ratio control device of modern internal combustion engines is an important part of the internal combustion engine control system. For a long time, in order to further improve the combustion of internal combust...

AI Technical Summary

Problems solved by technology

For example, in gasoline internal combustion engines, when gasoline and air are mixed and burned, too much or too little air cannot make gasoline burn effectively, that is, insufficient combustion

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