Cam based on flexible engine oil injection

Abstract

The invention aims to provide a cam based on flexible engine oil injection. The cam comprises a rise travel section and a return section, wherein the rise travel section corresponds to a positive equally accelerating stage, a working section and a positive equally decelerating stage of a motion rule of an engine plunger driven piece; the return section corresponds to a reverse equally accelerating stage, a reverse constant speed stage and a reverse equally decelerating stage of the motion rule of the engine plunger driven piece; the reverse constant speed stage has the rate of v3; and the working section comprises an accelerating stage and a positive constant speed stage, wherein the accelerating stage has the initial rate of v1, and the positive constant speed stage has the rate of v2. The cam has the advantages that the requirements of oil injection pressure, oil injection speed and oil injection timing of a diesel engine at high / low rotary speed can be met, the oil injection flexibility under high-rotary speed working conditions can be improved, and the oil injection pressure under low-rotary speed working conditions is increased.

Description

technical field [0001] The present invention relates to cams in the field of engines. Background technique [0002] In the traditional technology, the fuel supply pump cam used in the electronic control fuel injection system of diesel engine is a constant velocity cam, and its thrust section corresponds to the positive constant acceleration, forward constant velocity and forward constant deceleration stages of the plunger follower movement law, and the return stroke The segment corresponds to the reverse constant acceleration, reverse constant velocity and reverse deceleration stages of the motion law of the cam plunger follower. Although the constant velocity cam has been widely used in the actual fuel injection system and has the advantage of being easy to control the injection law, it also has disadvantages: the constant velocity cam profile cannot take into account the influence of the injection pressure, injection pressure, and Injection rate and injection timing requi...

AI Technical Summary

Problems solved by technology

Although the constant velocity cam has been widely used in the actual fuel injection system and has the advantage of being easy to control the injection law, it also has disadvantages: the constant velocity cam profile cannot take into account the influence of the injection pressure, injection pressure, and Injection rate and injection timing requirements, and the engine is in low-speed conditions, especially low-speed high-load conditions, the injection pressure of the fuel injection system is low, resulting in poor spray atomization effect, after the fuel enters the combustion chamber, The combustion of large particles of oil droplets creates local high temperature, which produces more pollutants during the combustion process, which cannot meet the requirements of emission regulations and economy

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