Digital ignition control method for small carburetor gasoline engine capable of regulating idle speed and apparatus thereof

Abstract

The present invention discloses a digital ignition control method of miniature carburetor gasoline engine and its device. Said method and device can control ignition angle when the engine is being in various running conditions, specially can regulate ignition angle according to the difference value of the true running idle rotating speed and target idle rotating speed, when the difference value is positive value, the ignition angle can be reliatively reduced, when the difference value is negative value, the ignition angle can be relatively increased, after the control process is passed through a part of time, the rotating speed of the engine can be fluctuated around some average rotating speed, said average rotating speed is the target rotating speed.

Description

[0001] 1. Field [0002] The invention relates to an ignition device for a gasoline engine, in particular to a digital ignition control method and device for a small-sized carburetor gasoline engine capable of adjusting idle speed. The control method and its device can control the ignition advance of the engine under various operating conditions In particular, by adaptively controlling the ignition advance angle during idling operation, the idling speed of the engine can be adjusted, so that the speed of the gasoline engine during idling operation is more stable, and the emission of harmful gases is lower. 2. Background technology [0003] At present, most of the ignition systems of small gasoline engines use analog igniters. The ignition advance angle is a single function of the engine speed, especially at idle speed. The ignition advance angle is a fixed value. Since there is no adaptive adjustment function for the ignition advance angle, When the operating state of the engi...

AI Technical Summary

Problems solved by technology

Another digital ignition system under development, the system uses at least a throttle position sensor and a crankshaft position sensor, the ignition advance angle is a binary function of the engine crankshaft position and speed, this ignition system has the ability to The load has the advantage of controlling the ignition advance angle reasonably, but there are at least two disadvantages: one is that at least one more throttle position sensor is used, which makes the system structure complicated, the cost of the controller also increases, and the cost of the entire system increases. This system is not suitable for use in It is used on small gasoline engines. Second, the ignition advance angle is a binary function of the engine throttle position and speed in the range of the entire engine’s operating speed and throttle opening. It adopts an open-loop control method and does not emphasize the ignition advance angle in the idle state. Adaptive control is performed to regulate the engine speed, so there is no particular improvement in the stability of the engine idle speed

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