Variable valve timing and variable valve lift control system for automobile engine

Abstract

The invention discloses a variable valve timing and variable valve lift control system for an automobile engine, which comprises a return spring bracket 1, a cam shaft 2, a return spring 3, a shaft neck 4, a cam 5, a lead screw 6, a stepping motor 7 and a plug 8, wherein the return spring 3 is arranged in the return spring bracket 1; the return spring 3 is connected with the cam shaft 2; the shaft neck 4 is connected with the cam 5; the stepping motor 7 is connected with the cam 5 through the lead screw 6; and the plug 8 is arranged on the stepping motor 7 and is used for connecting an external power source. The system of the invention can be formed by direct expansion on an engine computer and does not need an individual control system. Moreover, by controlling an intake valve and an exhaust valve, exhaust gas recirculation (EGR) of an engine can be realized very conveniently, and emission of NOX is greatly reduced.

Description

technical field [0001] The invention relates to a variable valve timing and variable valve lift control system of an automobile engine. Background technique [0002] The valve timing and valve lift of an automobile engine have a great influence on engine performance. As the engine speed and load are different, the requirements for valve timing and valve lift are also different. As the engine speed and load increase, the valve opening angle, the valve closing angle and the valve lift should all increase, and vice versa. However, in the traditional engine valve train, the shape of the valve drive cam and the relative position between the camshaft and the crankshaft are fixed, and the valve timing and valve lift cannot be changed when the engine is running. can be optimized in any case. In order to solve the above problems, variable valve timing and variable valve lift devices for automobile engines have emerged as the times require. However, the existing variable valve tim...

AI Technical Summary

Problems solved by technology

However, the existing variable valve timing mechanism mainly changes the relative position of the crankshaft and the camshaft, increases the valve early opening angle and reduces the valve late closing angle, and the total angle remains unchanged; and variable Valve timing and variable valve lift are not continuously changed, but only divided into two stages, so it still cannot meet the needs of all working conditions.

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