Digital ignition control method of small-size four-stroke engine

Abstract

The invention discloses a digital ignition control method of a small-size four-stroke engine, and belongs to the technical field of engine ignition control. The digital ignition control method comprises the following steps that 1, the time for a piston inside the small-size four-stroke engine to continuously operate two circles is obtained, the first-circle operation time of the piston is denoted as T1, and the second-circle operation time of the piston is denoted as T2; 2, the difference value between T1 and T2 is obtained; and 3, if the difference value in the step 2 is a positive number, the second circle corresponding to T2 is judged to be an ignition circle, the first circle corresponding to T1 is judged to be a non-ignition circle, and a digital igniter is made to ignite in T2, if the difference value in the step 2 is a negative number, the first circle corresponding to T1 is judged to be an ignition circle, the second circle corresponding to T2 is judged to be a non-ignition circle, and the digital igniter is made to ignite in T1. According to the digital ignition control method of the small-size four-stroke engine, the ignition circle and the non-ignition circle are judged through the difference between the two circles of continuous operation of the piston, the purpose that ignition is conducted only within the ignition circle in the cycling operation process of the small-size four-stroke engine is achieved, and the operation principle of the engine is met.

Description

technical field [0001] The invention relates to the technical field of engine ignition control, in particular to a digital ignition control method for a small four-stroke engine. Background technique [0002] In recent years, domestic small engine manufacturers have gradually adopted digital igniters for engine ignition. The existing digital igniters on the domestic market all use the same way of fire failure or large retreat angle as the original analog circuit igniters to achieve speed limit. There are speed limit instability, abnormal noise and exhaust when the engine rotates to the speed limit section. The problem of high temperature, especially when the igniter originally used in two-stroke engines is used in small four-stroke engines, the problem is more prominent. [0003] Due to the increasingly higher requirements of the ecological environment on the engine emission value, the emission value of the four-stroke engine is better than that of the two-stroke engine, wh...

AI Technical Summary

Problems solved by technology

Since most of the exhaust gas has been exhausted, it is difficult for the electric spark generated by the digital igniter to control the spark plug to ignite the remaining small part of the exhaust gas. Therefore, the ignition in the exhaust stroke is invalid ignition

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