Based on the self-developed hydraulic variable valve mechanism of four-cylinder engine, this paper proposes a variable displacement valve control strategy based on the VOC-CDA mode of electro-hydraulic. The variation rules of in-cylinder pressure, oxygen mass fraction in exhaust gas, torque fluctuation and other parameters in the process of cylinder deactivation cycle and working mode conversion are analyzed, and the control parameters of inlet and exhaust valves at the best cylinder deactivation time are optimized. The energy saving mechanism of variable displacement technology is analyzed from the aspects of indicated thermal efficiency, mechanical efficiency and effective thermal efficiency. Based on the optimal intake and exhaust valve closing time, the engine can improve the fuel economy by 8.7% at medium and small loads. It provides a certain design reference for the development of variable displacement engine based on hydraulic variable valve mechanism.
Research on Variable Displacement Valve Control Strategy Based on Electro-hydraulic Drive Intake and Exhaust Valve Opening and Closing Mode
Int.J Automot. Technol.
International Journal of Automotive Technology ; 25 , 6 ; 1445-1468
01.12.2024
24 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
OPENING/CLOSING VALVE AND HYDRAULIC PRESSURE CONTROL DEVICE
Europäisches Patentamt | 2017
|Europäisches Patentamt | 2023
|Intake valve opening optimization
Kraftfahrwesen | 1998
|