Electrical control unit of petrol engine

Abstract

The invention relates to an improvement of an electrical control unit of a petrol engine for a car, which is characterized in that a power supply and a crankshaft signal processing circuit of a reset management unit, a communication unit and a frequency signal input unit in the electrical control unit are finished by an L9741 integrated chip; an oxygen sensor heating drive circuit comprises a power switch drive circuit; and an ignition feedback detecting circuit in an ignition drive unit comprises a hysteresis loop comparing circuit. Compared with the prior art, the invention reduces the costof a forming circuit of the control unit and the comprehensive cost by 20 percent or so, realizes the working synchronization of an oxygen sensor and an engine, improves the reliability of ignition detection, ensures the synchronization of oil spray and effective ignition, lowers standard exceeding discharge caused by unburned accidental fire sprayed oil and leads the whole working process of theengine to be capable of meeting the requirement of high-standard discharge and the high-standard requirement of Chinese grade-four discharge.

Description

technical field [0001] The invention is an improvement to an electronic control unit of a gasoline engine for a vehicle, and in particular relates to an electronic control unit of a gasoline engine with optimized combustion, high control precision and effective cost reduction. Background technique [0002] The engine electronic control unit (ECU, Electronic Control Unit) is mainly used to coordinate fuel injection, ignition, and air intake, effectively control the internal combustion of the engine cylinder, and minimize the emission of pollutants during the combustion process. It is the brain of the entire engine control system. [0003] At present, in the design scheme of the gasoline engine electronic control unit, it is generally adopted to use one integrated chip or even several integrated chips for each functional circuit, and then the main control unit coordinates the control, that is, the electronic control unit is divided into the main control unit, the idle step Inc...

AI Technical Summary

Problems solved by technology

With this structural circuit, the voltage after voltage division will also fluctuate, so that the voltage value obtained through analog-to-digital conversion is also prone to fluctuations, resulting in inaccurate judgments on the effectiveness of ignition, so that fuel injection cannot be effectively controlled, and emission standards will also be affected.

Secondly, there is another disadvantage of collecting the ignition signal by resistive voltage division, that is, an ignition feedback circuit is required for the ignition output signal of each cylinder to detect the ignition output of each cylinder separately, resulting in more engine cylinders and more repeated circuits, resulting in Increased costs

[0007] All of the above have resulted in the difficulty of controlling and optimizing the combustion of the existing gasoline engine electronic control units to meet strict emission requirements such as the National IV standards. This has become a technical problem faced by many electronic control system manufacturers.

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