Method for identifying top dead center of compression of cylinder 1 of automobile engine
A technology of compression top dead center and engine, which is applied in engine control, machine/engine, mechanical equipment, etc., can solve the problems of inability to distinguish compression top dead center and exhaust top dead center, and achieve the effect of simplifying design and saving system cost
Inactive Publication Date: 2010-02-24
北京锐意泰克汽车电子有限公司
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Problems solved by technology
Although the crankshaft position sensor can make the ECU identify the top dead center of the 1 cylinder, it cannot distinguish whether it is the compression top dead center or the exhaust top dead center of the 1 cylinder.
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[0017] The method for identifying the compression top dead center of the 1-cylinder of the automobile engine proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:
[0018] (1) Turn on the ignition key switch of the automobile, and the automobile electronic control unit sets the initial voltage signal of the automobile camshaft as a high-level signal;
[0019] (2) Start the engine, after the car camshaft rotates 4-8 times, the electronic control unit collects the intake pressure signals of the engine cylinder 1 and cylinder 4 multiple times;
[0020] (3) The electronic control unit obtains the maximum value and minimum value of the intake pressure from the intake pressure signal of cylinder 1 of the engine collected multiple times, and calculates the difference MAP between the maximum value of the intake pressure and the minimum value of the intake pressure 1 , obtain the maximum and minimum values of the intake pressu...
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The invention relates to a method for identifying top dead center of compression of cylinder 1 of automobile engine, belonging to the technical field of automobile automatic control. An automobile isstarted, an initial voltage signal of an automobile cam shaft is set into a low level signal by ECU; an engine is started, ECU collects an admission pressure signal of the engine cylinder 1 and an engine cylinder 4 to obtain the maximum value, minimum value and difference of the admission pressure, compared with the differences of the cylinder 1 and the cylinder 4, the synchronous state of the initial voltage signal of the automobile cam shaft, set by the electronic control unit, and the top dead center of compression of the cylinder 1, is determined, when the synchronous state is incorrect, the voltage signal of the cam shaft is adjusted. In the method, a camshaft position sensor is not needed, but the top dead center of compression of cylinder 1 can be identified, so as to carry out accurate synchronization of the engine and ECU and realize accurate sequence injection of fuel oil. The method can save system cost, simplify the design of the engine and obtain dual benefits of economy and technology.
Description
technical field [0001] The invention relates to a method for identifying compression top dead center of a cylinder of an automobile engine, belonging to the technical field of automobile automatic control. Background technique [0002] The electronically controlled fuel injection system of automobile engine has the advantages of precise control, quick response, closed-loop control, and optimal vehicle performance. It has occupied most of the gasoline engine market in modern times. The electronically controlled fuel injection system of a modern four-stroke engine includes three parts: an electronic control unit (hereinafter referred to as ECU), a sensor, and an actuator. Among them, the crankshaft position sensor is generally used to measure the speed information and the crankshaft position information. [0003] A common crankshaft position sensor is composed of a pulse disc and an electromagnetic induction sensor. The pulse disc is a gear disc with 60 gear teeth, but 2 gear ...
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Inventor 范焱裴蕾赵小娜
Owner 北京锐意泰克汽车电子有限公司