Control Strategy of Diesel Engine Electric-Supercharging under Steady and Transient Conditions

SONG Yanping; CHENG Jianghua; CHENG Zhenyu; GUO Wenjun; SHI Lei; DENG Kangyao

doi:10.3969/j.issn.1001-2222.2022.03.008

Vehicle Engine ›› 2022, Vol. 0 ›› Issue (3) : 51-58. DOI: 10.3969/j.issn.1001-2222.2022.03.008

Control Strategy of Diesel Engine Electric-Supercharging under Steady and Transient Conditions

SONG Yanping¹,CHENG Jianghua²,CHENG Zhenyu²,GUO Wenjun¹,SHI Lei¹,DENG Kangyao¹

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Abstract

In order to improve the insufficient boost pressure and transient turbine hysteresis under low-speed conditions of turbocharged diesel engine, the steady-state and transient control strategies of electric supercharger for vehicle diesel engine were studied. The simulation results show that the electric supercharger can increase the boost pressure and improve the low-speed steady-state performance significantly. The specific fuel consumption reduces by 8% under the full-load condition of 800 r/min when the electric supercharger runs at 65 000 r/min. And increasing the fuel injection to 108.5 mg/cycle at the same speed can improve the output of torque by 27.06% when the electric supercharger runs at 55 500 r/min. The electric supercharger shall gradually decrease the speed with the increase of engine speed and shall be bypassed beyond 1 400 r/min. The speed of electric supercharger for power control strategy shall be lower than that for economy control strategy. The control strategy of accelerating process at constant load shows that the maintaining time of electric supercharger step speed shall gradually decrease with the decrease of load. The response index K increases by 49.54% at 100% load.

Key words

electric supercharging / low-speed performance / control strategy / simulation / diesel engine

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SONG Yanping,CHENG Jianghua,CHENG Zhenyu,GUO Wenjun,SHI Lei,DENG Kangyao. Control Strategy of Diesel Engine Electric-Supercharging under Steady and Transient Conditions[J]. Vehicle Engine. 2022, 0(3): 51-58 https://doi.org/10.3969/j.issn.1001-2222.2022.03.008