Engine Fully Variable Valve Parameters Coupling Study Based on Multiple Regression Analysis

To obtain the optimum solution of valve running parameters, the coupling rules among valve parameters were analyzed based on a simulation model of four-cylinder diesel engine, the multivariate regression analysis method, and a valve parameter coupling data base by simulation orthogonal experiments. Further more, an electro-hydraulic fully variable valve model of the engine was built to verify the actual optimal solution. The combined simulation results show that, the optimal solution is improved by 3.8% than the original optimal power, and the average speed of inlet and outlet valve is decreased by 31.1% and 37.5% respectively in the premise of improving the performance of the engine. Finally, the optimal solution of the valve parameters obtained by the regression model satisfies the driving ability of electro-hydraulic driving system and improves the driving efficiency effectively.