Scavenging recirculation energy-saving method for two-stroke petrol engine

Abstract

The invention relates to a scavenging recirculation energy-saving method for a two-stroke petrol engine. The two-stroke petrol engine comprises an air inlet pipe, an exhaust pipe, a crankshaft position sensor, a crankshaft fluted disc, a scavenging recirculation quick control valve, a connecting air inlet pipe, a scavenging bypass pipe of the exhaust pipe and a scavenging recirculation central controller, wherein the scavenging recirculation quick control valve is connected in series to the scavenging bypass pipe; when a piston moves from an upper dead point to a lower dead point, and the top surface of the piston passes through the upper edge of a scavenging port, the scavenging recirculation central controller controls the scavenging recirculation quick control valve to be opened quickly, so that combustible mixed gas exhausted from the exhaust port in the scavenging process is reintroduced into the air inlet pipe from the exhaust pipe through the scavenging bypass pipe by using the scavenging recirculation quick control valve; and when the piston moves from the lower dead point to the upper dead point, and the top surface of the piston passes through the upper edge of the exhaust port, the scavenging recirculation central controller controls the scavenging recirculation quick control valve to be closed quickly. The scavenging recirculation energy-saving method can be widely applied to energy-saving control over the conventional two-stroke petrol engine, reduces emission of nitrogen oxides because combusted waste gas participates in burning, and has a simple and compact structure, low manufacturing cost, high economic efficiency and a remarkable emission effect.

Description

technical field [0001] The invention relates to an energy-saving method for an engine, in particular to an energy-saving method for a two-stroke gasoline engine. Background technique [0002] Most of the existing two-stroke gasoline engine ventilation systems use the crankcase as a "transfer station" to scavenge by combustible mixture. That is: during the movement of the piston from the top dead center to the bottom dead center, the top surface of the piston is used to first open the exhaust port for exhaust; then, the piston continues to descend and the scavenging port is opened. When the crankcase pressure is greater than the cylinder pressure, the combustible mixture The gas enters the cylinder from the crankcase through the scavenging port, and at the same time drives the exhaust gas to continue to be discharged. This process continues until the piston passes through the bottom dead center and closes the scavenging port in the upward process; , part of the combustible m...

AI Technical Summary

Problems solved by technology

This is the most basic reason for the poor economy and poor emission of existing two-stroke gasoline engines

[0003] In order to solve the problems of poor economy and emission of two-stroke gasoline engines, a lot of research has been carried out at home and abroad, such as gasoline injection technology, exhaust tuning technology, exhaust additional devices, various ways of stratified scavenging and direct injection in cylinders. technology, etc., but the above-mentioned technologies have different degrees of problems in terms of structural complexity, cost control, reliability of engines under different working conditions, and requirements for fuel quality.

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