An Intensive Hydraulic Axial Movement Three-Stage Variable Valve Drive System

Abstract

An intensive hydraulic axially movable three-stage variable valve driving system belongs to the field of internal combustion engine valve driving. It includes camshaft sleeve, first actuator, second actuator, third actuator, first control mechanism, second control mechanism, third control mechanism, high pressure source, low pressure source, etc. Three cams and two switching slots are arranged on the camshaft sleeve. A set of first control mechanism controls the first actuator of multiple cylinders, a set of second control mechanism controls the second actuator of multiple cylinders, and a set of third control mechanism controls the third actuator of multiple cylinders. The current position and adjustment direction of the shaft sleeve, select and excite these three control mechanisms to realize the axial movement of the camshaft sleeve of these cylinders, realize the switching of the three cams, simplify the structure, and reduce the cost. According to actual needs, different cams are used to meet the requirements of different working conditions or different modes of the internal combustion engine, thereby comprehensively improving engine performance.

Description

technical field [0001] The invention relates to an intensive hydraulic axially movable three-stage variable valve driving system, which belongs to the field of internal combustion engine valve driving. Background technique [0002] With the increasingly serious energy and environmental issues, and people's focus on driving and safety of vehicles, future engines need to comprehensively consider power, economy, emissions and safety on the premise of meeting emission standards. This requires optimizing engine performance over the full range of driving and braking conditions. At present, technologies such as variable valve, variable stroke number, cylinder deactivation, auxiliary braking, new combustion mode, variable compression ratio, variable EGR and other technologies that have attracted much attention only affect the performance of the engine in a small range of operating conditions. Make improvements. For example, the existing variable valve technology is only applied to...

AI Technical Summary

Problems solved by technology

This type of system still needs to be improved in the following two aspects: a) the system requires a large number of oil feeders and solenoid valves, and the overall cost of the system is relatively high; b) the adjustable range of valve operation is limited by the oil supply and control devices , the independent adjustment between valve opening and closing timing and stroke cannot be realized, and the 360°CA / cycle valve operation process required by the two-stroke driving mode and the two-stroke braking mode of the engine cannot be realized, etc.

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