Control method for preventing vehicle flameout caused by signal loss of crankshaft position sensor

Abstract

The invention discloses a control method for preventing vehicle flameout caused by signal loss of a crankshaft position sensor, and relates to the technical field of automobile manufacturing. The method comprises the following steps: 1) when a crankshaft position signal is lost, an engine control system calculates a virtual crankshaft position signal by adopting the camshaft position signal; and 2) after the crankshaft position signal is lost, the engine control system continuously controls an engine to ignite and inject oil according to the calculated crankshaft position signal, and sends a flag bit of crankshaft position signal failure to other control systems of the vehicle. The problems that in the prior art, when the engine control system loses a crankshaft position signal, the enginehas the risk of flameout, hidden danger caused by high-speed rear-end collision accidents exists, and the driving direction cannot be controlled due to the fact that steering suddenly loses assistance, can be solved. Further the problems that when other derivative functions are developed, the cam signal resolution is not enough, and the reliability of the derivative functions may deviate can be also solved.

Description

Technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a control method for preventing the loss of a crankshaft position sensor signal and causing a vehicle to stall. Background technique [0002] The crankshaft position sensor is the most important sensor of an electronic fuel injection engine. The engine electronic control system detects the crankshaft angle of the engine through the crankshaft position sensor, and cooperates with the camshaft position sensor signal to identify the top dead center position of the piston, and on this basis, controls the engine ignition And when the fuel injection is normal, the engine can operate normally. [0003] The general number of teeth of the crankshaft signal plate is 60-2, that is, originally 60 convex teeth, subtract 2 to get 58 convex teeth, 57 small teeth missing and 1 large tooth missing. Calculated based on the original 60 teeth, the angle between each tooth and the tooth is...

AI Technical Summary

Problems solved by technology

This will seriously affect driving safety. When developing other derivative functions, the resolution of the cam signal is not enough, which leads to the risk of reliability deviation of the derivative functions.

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