Effect of Over-Expansion Cycle Engine Valve Phase Deviation on Air Charge Model Accuracy
In order to improve the accuracy of the over-expansion cycle engine air charge model,improve engine performance and improve the dynamic condition mixture control of the vehicle,it is necessary to accurately control the phase of the engine's intake valve.In this paper,the influence of the Intake Valve Open(IVO)timing and Intake Valve Close(IVC)timing on air charge model is analyzed,the influence of valve phase deviation on the accuracy of the air charge model is analyzed theoretically,and the influence of different valve phase deviations on the accuracy of the air charge model is verified by experiments,in order to meet the accuracy requirements of the air charge model deviation of no more than±5%,the intake valve phase deviation needs to be controlled within the range of±1.5 °CA.The influence of the intake phase deviation on the air charge model is corrected by controlling the phase accuracy of the assembly machinery and adding the Electronic Control Unit(ECU)phase deviation adaptive model,and the effect of phase deviation control is verified by experiments.
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