Structure Integration Research Of Variable Valve Timing And Lift System By Hydraulic Volume Adjustable

Global car ownership has exceeded 1 billion, followed by the energy crisis, while serious pollution to the environment, for automotive engine technology needs to be done to further improve the high efficiency, low emissions and pollution aspects; engine full variable valve lift technology is an important direction, Research group put forward-variable valve timing and lift system by hydraulic volume adjustable, through the test results, the system can realize the valve timing and lift continuously variable; Research group previous experimental system, As the overall system volume is too large, is not applicable in combined with the car existing space, In this paper, based on the previous experimental device, the system structure integration research, including the following points:Working principle analysis for variable valve timing and lift system by hydraulic volume adjustable, Analysis of the working process of the phase and lift regulator, to identify the main structural parameters of the system.On the basis of the principles and structure parameters on the system module division, analysis of each module, space, position, control and work characteristics,module is present relevance and differences; the structure of the system integration design, integration after variable valve system has a small size and convenience advantages.After the integration of variable valve system the cylinder valve hydraulic power subsystem structure parameters are the same, Because of differences in the structure of the flow channel is arranged, at right angles to the number of different corners anddifferent lengths, pressure parameters affecting system, the establishment of a mathematical model runner its simulation. Since the first cylinder flow path of the most complex, the most simple and fourth cylinder flow path through the steady flow of the first cylinder and the fourth cylinder runner runner simulation comparison, simultaneous analysis of the flow path at right angles to bend the flow field, the proposed system improvement program; by unsteady flow analysis system hydraulic compression chamber volume hydraulic system influence, while the pressure transient is analyzed,and the corresponding improvement measures come first cylinder and a fourth cylinder runner runner have similar pressure characteristics.Variable valve timing and lift system by hydraulic volume adjustable application Integration test, the valve motion curves through the experimental analysis, studies show that: the system by integrating design, the overall system volume was significantly reduced, to adapt to the existing vehicle space position and a more good stability,economy, and can effectively control the valve timing and lift.