Method for rapidly judging phase of electric-controlled engine system

Abstract

The aim of the invention is to provide a method for quickly determining the system phase of an electrically controlled engine. The key points of the method include: an engine crankshaft is provided with a crankshaft signal wheel with equidistant multi-tooth structure and a cam shaft is provided with a cam shaft signal wheel with single-tooth structure. Corresponding to the range of the single-tooth signal of the cam shaft signal wheel, the crankshaft signal wheel is provided with a missing-tooth, of which the width is an integral multiple of the normal tooth distance. An electrically controlled unit of the engine can determine the system phase of the engine by detecting a rising edge and a descending edge of the tooth signal of the cam shaft signal wheel, and the corresponding relation ship between rising edges of the missing-tooth signal of the crankshaft signal wheel and electrical levels of the signal of the cam shaft signal wheel. The method has the advantages of determining the system phase of the engine in a short time, reducing the starting time of the engine and simultaneously less modifying the hardware of the engine, along with low cost and suitability for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of control of electronically controlled engines, and in particular relates to a method for judging system phases in the technical field of electronically controlled engines. Background technique [0002] In the working process of the electronically controlled engine, it is necessary to accurately determine the phase relationship between the camshaft and the crankshaft, so as to correctly control the opening and closing of the intake and exhaust valves of each cylinder and perform fuel injection or spark plug ignition. In the working cycle, the crankshaft rotates twice and the camshaft rotates once, so the phase relationship between the crankshaft and the camshaft is not one-to-one correspondence. At present, the phase detection of electronically controlled engines mainly adopts the following method: the crankshaft signal wheel adopts a 60-2 tooth structure, that is, the entire crankshaft signal wheel ring ge...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned method of judging the phase by relying on the level of the single tooth signal of the camshaft and the missing tooth signal of the crankshaft has at most two chances to judge the phase within 720 degrees of the crankshaft angle, and the judgment time is too long, thus prolonging the engine start-up time

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