Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof

Abstract

The invention provides a simple-structure low-cost internal combustion engine distribution mechanism with a continuously variable valve stroke and a control method thereof, which aims at improving output and fuel consumption conditions of an internal combustion engine. The distribution mechanism comprises a cam driven by a camshaft, a rocker arm driven by the cam, a valve controlled by the rocker arm and a valve spring for driving the valve to reset, wherein one end of the rocker arm abuts against the cam and is tangential to the cam, and the other end is in movable connection with the top end of the valve. A spindle driven by a stepping motor is arranged above the rocker arm and is provided with a roller through a rolling wheel support. The top surface of the rocker arm is an arc surface corresponding to the motion trail of the roller, and the roller is in tight contact with the arc surface. By arranging the support part which can be driven by a control mechanism to move in the length direction of the rocker arm, the distribution mechanism can continuously change the distance between the valve and the support part as well as the distance between the cam and the support part so as to continuously change the valve stroke, thereby realizing the purpose of improving output and fuel consumption conditions of an internal combustion engine.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine manufacturing, and in particular relates to a gas distribution mechanism of an internal combustion engine and a control method thereof. Background technique [0002] In the gas distribution system of a reciprocating internal combustion engine, the lift of the valve is generally fixed and invariable, but when the internal combustion engine, especially the gasoline engine, operates under different operating conditions and different speeds, the requirements for the gas distribution system are also different, for example Said: A smaller valve lift is required at low speeds, which can generate greater intake negative pressure and more swirls, allowing air and fuel to be fully mixed, thus increasing torque output at low speeds; larger valves are required at high speeds Lift, let the engine breathe more smoothly, in order to obtain a strong power output at high speed, which requires a ...

AI Technical Summary

Problems solved by technology

This solution uses different cams to drive valve tappets at high speed and low speed to change the valve timing and valve lift. The structure is very complicated and the manufacturing cost is high.

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