Self-adaptive control method of automobile fuel system and controller

Abstract

The invention belongs to the technical field of control for the oil injecting amount of a cylinder oil injector of an automobile engine, and particularly relates to a simple-operation, accurate-implementation and convenient-use self-adaptive control method of an automobile fuel system and a controller. The control method comprises the following steps of: intercepting an oil-injecting pulse signal output by an automobile computer in real time, and acquiring the initial oil-injecting pulse width by sampling; and carrying out automatic adjustment on the oil-injecting pulse width for different automobile fuels when an automobile is started and operated so as to achieve the purpose of control. The controller comprises a main control unit, a manual cold-start switch and a mode changing switch, wherein the main control unit comprises a signal input circuit, a shaping circuit, a processing module and a driving circuit; the mode changing switch is connected with the processing module; and the cold-start switch is connected with the processing module. The invention has the beneficial effects that when the fuel of the automobile is replaced, the circuit does not need to be replaced; and the control can be accurate to the microsecond level, so as to realize stable running of the automobile under different environments and reduce resource waste.

Description

technical field [0001] The invention belongs to the technical field of controlling the fuel injection quantity of a cylinder fuel injector of an automobile engine, and in particular relates to an adaptive control method and a controller of an automobile fuel system. Background technique [0002] The existing fuel control is generally composed of pure electronic circuits without using an integrated microprocessor, and a relay is used as a mode selection switch and a cold start switch in the device, and the fuel control mode is selected by opening and closing the relay; an external switch is used for cold start The control relay is kept on for a period of time, and the injector injects fuel continuously to ensure startup. The fuel injection pulse electric signal passes through the LM139JS voltage comparator to adjust the width of the pulse signal, amplifies and outputs to the fuel injector. This type of controller has the following two major defects: (1) The scope of applicat...

AI Technical Summary

Problems solved by technology

This type of controller has the following two major defects: (1) The scope of application is small. If the type of fuel is changed, the circuit needs to be manually changed, and the operation is more complicated and the accuracy is relatively low.

(2) In a low temperature environment, it is necessary to judge whether to do a cold start based on the subjective judgment of the temperature, so the accuracy of the operation is not high

And the method of cold start is generally to turn on the ignition head, spray an appropriate amount of fuel into the engine cylinder through the opening and closing of an external switch, press the start switch button, within 0.5s, the fuel injector will continue to inject fuel and increase the concentration. The concentration of the mixture makes the car start, and the amount of fuel injection needs to be manually tried continuously, which is troublesome to use

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