Fuel control device and control method for manifold injection type gasoline engine

Abstract

The invention provides a fuel control device and a control method for a manifold injection type gasoline engine. The control device is provided with an internal combustion mechanism, a gas inlet pipeline, a gas exhaust pipeline, a throttle valve, a gas inlet manifold, a gasoline injector, at least one air cylinder, an air-fuel ratio sensor and a controller, wherein the gas inlet pipeline and the gas exhaust pipeline are connected with the internal combustion mechanism; the throttle valve is configured downstream of the gas inlet pipeline; the gas inlet manifold is configured downstream of thethrottle valve; the gasoline injector is used for injecting gasoline into the gas inlet manifold; the at least one air cylinder is provided with a gas inlet valve and a gas exhaust valve; the air-fuelratio sensor is configured downstream of the gas exhaust pipeline; and the controller is used for comparing the actually measured air-fuel ratio data which are measured by the air-fuel ratio sensor with the recorded transient air-fuel ratio data of the working condition which are stored in an ECU (Electronic Control Unit), regulating an air-fuel ratio target value to be a value which fluctuates within a specified amplitude when a comparison result exceeds the specified range, and correcting a fuel compensating parameter in real time according to the waveform of the actually measured air-fuelratio data after regulation. According to the fuel control device and the control method for the manifold injection type gasoline engine, the fuel compensating parameter can be regulated in real time.

Description

technical field [0001] The invention relates to a fuel control device and a control method of a manifold injection gasoline engine. Background technique [0002] The control of the air-fuel ratio has a significant impact on the engine's power, economy, and exhaust emissions. The inaccurate control will lead to a decline in the power and economy of the gasoline engine, and an increase in the emission of harmful gases. Therefore, precise control of fuel injection to achieve precise air-fuel ratio control is of great significance for reducing exhaust emissions and reducing air pollution. [0003] The fuel injection system of the engine itself is a very complex nonlinear system, especially in the transient condition of the engine's rapid acceleration and deceleration. In the manifold injection engine, the evaporation mechanism of the fuel, the formation process of the mixture, etc. cannot be described by an accurate physical model, and these all affect the control of the fuel ...

AI Technical Summary

Problems solved by technology

In order to solve the problem of emission deterioration caused by inaccurate fuel injection compensation parameters caused by poor engine manufacturing or life aging, the present invention adopts an online parameter adjustment method based on air-fuel ratio sensor data

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