Engine reverse turning-proof method and system

Abstract

The invention relates to a reverse rotation preventing method for an engine and a system thereof. The method comprises the following steps: setting a tooth width limiting value for a rotating speed signal as a reference for judging whether the engine generates reverse rotation; acquiring the tooth width of the rotating speed signal in the running process of the engine in real time; judging whether the tooth width of the rotating speed signal is larger than the tooth width limiting value of the rotating speed signal or not; and if yes, predicting that reverse rotation is about to occur, and cutting off ignition action of the engine and giving an alarm. A comparing unit of the system is used for judging whether the tooth width of the rotating speed signal is larger than the tooth width limiting value of the rotating speed signal or not; a reverse rotation predicting unit is used for predicting that the reverse rotation is about to occur when the tooth width of the rotating speed signal is larger than the tooth width limiting value of the rotating speed signal; and a reverse rotation preventing unit is used for cutting off the ignition action of the engine and giving the alarm when predicting that the reverse rotation is about to occur. The method and the system can timely and early warn reverse rotating conditions generated in a cylinder so as to avoid serious damage to the engine, and timely stop the ignition action as well as ignite an indicator light, thereby protecting the safety of a driver.

Description

technical field [0001] The invention relates to the field of engine idle speed control, in particular to a method and system suitable for anti-rotation of a single-cylinder engine, especially a motorcycle engine. Background technique [0002] At present, most motorcycles use a single-cylinder engine, which can not only meet the power demand, but also meet the motorcycle's demand for engine space. But such structure will appear the phenomenon that crankshaft reverses. This is a problem that can seriously damage the engine. Specifically, the reverse situation is prone to occur in the following situations: starting when the battery energy is low; sudden switching of high-speed transmission ratio, especially when going uphill; emergency braking or collision; when backfire occurs; wrong gear shifting Cooperate with the accelerator and the clutch, because the above situations will cause the piston in the cylinder to change speed suddenly, and only when the up and down speed of t...

AI Technical Summary

Problems solved by technology

[0003] When a reverse phenomenon occurs during the working process of a large-bore single-cylinder engine, and the ignition is ignited at the same time during the reverse rotation, this may cause serious damage to the engine. In the prior art, the improvement of the hardware structure is mostly used to prevent the engine from reverse On the one hand, it increases the cost of the engine and increases the complexity of the engine structure; on the other hand, it is not suitable for application in small equipment such as motorcycles.

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