Intensive type hydraulic axial mobile two-phase variable valve driving system and control method thereof

Abstract

The invention relates to an intensive type hydraulic axial mobile two-phase variable valve driving system and a control method thereof and belongs to the field of internal combustion engine valve driving. The intensive type hydraulic axial mobile two-phase variable valve driving system comprises camshaft shaft sleeves, first execution mechanisms, second execution mechanisms, a first control mechanism, a second control mechanism, a high-pressure source and a low-pressure source and the like. The camshaft shaft sleeve is provided with two cams and two switching grooves. The first control mechanism controls the first execution mechanisms of a plurality of cylinders to move the camshaft shaft sleeves of these cylinders leftwards, the second control mechanism controls the second execution mechanisms of the plurality of cylinders to move the camshaft shaft sleeves of these cylinders rightwards, finally switching between the two cams is implemented, the system structure is greatly simplified, and the cost is reduced. According to actual requirements, different cams are adopted, requirements for running under different working conditions or in different modes are met, and the goal of comprehensively improving engine dynamic property, fuel economy, emission performance and brake safety is achieved.

Description

technical field [0001] The invention relates to an intensive hydraulic axially movable two-stage variable valve driving system and a control method thereof, belonging 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 techno...

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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