High-precision ignition system

Abstract

The invention discloses a high-precision ignition system. The high-precision ignition system comprises a trigger signal filter processing module, and the trigger signal filter processing module is used for sequentially transmitting a first trigger signal A, a second trigger signal B and a third trigger signal C to an MCU; the wavy interval time of the adjacent first trigger signals A is a time value T required by 360-degree rotation of a flywheel; and the wavy interval time of the first trigger signal A and the second trigger signal B is a time value t required by N-degree rotation of the flywheel. According to the high-precision ignition system, the instantaneous rotation speed, approaching ignition, of the flywheel is acquired through the calculation manner of t, an ignition delay valueacquired through t is more approximate to a practical required value, high-precision design of the ignition angle is achieved, and the practical ignition angle on an engine is controlled to be + / - 1.

Description

technical field [0001] The invention relates to a high-precision ignition system, which is applied to small internal combustion gasoline engines, such as lawn mowers, brush cutters, hedge trimmers, chain saws and the like in the field of garden tools. Background technique [0002] The traditional digital igniter for small gasoline engines uses MCU as the core control unit to provide a suitable ignition signal for the normal operation of the gasoline engine. The timing of the ignition signal output is obtained by recalculating the period value of the magnetic flywheel rotation. The ignition timing obtained by this method can meet the requirements when the engine is running at high speed, but when the gasoline engine is running at startup and idling, the speed of the gasoline engine fluctuates greatly, and the speed difference at different positions during the cycle of the magnetic flywheel rotation It is very large, because the gas mixture in the cylinder is compressed during...

AI Technical Summary

Problems solved by technology

The ignition timing obtained by this method can meet the requirements when the engine is running at high speed, but when the gasoline engine is running at startup and idling, the speed of the gasoline engine fluctuates greatly, and the speed difference at different positions during the cycle of the magnetic flywheel rotation It is very large, because the gas mixture in the cylinder is compressed during the working process of the gasoline engine, and the speed of the magnetic flywheel drops sharply during the compression process. At this time, the ignition time calculated after the magnetic flywheel rotates once cannot meet the best ignition time required by the engine. The deviation of the ignition timing output by the ignition device is relatively large, resulting in large fluctuations in the engine speed when the engine is idling, and the bad situation of engine recoil caused by inaccurate ignition timing when starting

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