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In modem four-stroke engine technology,variable valve timing and lift control offers potential benefits for making a high-performance engine.A novel electro-hydraulic fully variable valve train for four-stroke automotive engines is introduced.The construction of the nonlinear mathematic model of the valve train system and its dynamic analysis are also presented.Experimental and simulation results show that the novel electro-hydraulic valve train can achieve fully variable valve timing and lift control.Consequently the engine performance on different loads and speeds will be significantly increased.The technology also permits the elimination of the traditional throttle valve in the gasoline engines and increases engine design flexibility.
In modem four-stroke engine technology, variable valve timing and lift control offers potential benefits for making a high-performance engine. A novel electro-hydraulic fully variable valve train for four-stroke automotive engines is described. The construction of the nonlinear mathematic model of the valve train system and its dynamic analysis are also presented. Experimental and simulation results show that the novel electro-hydraulic valve train can achieve fully variable valve timing and lift control. Convustion of the engine performance on different loads and speeds will be significantly increased. The technology also permits the elimination of the traditional throttle valve in the gasoline engines and increases engine design flexibility.