摘要
为了改善涡轮增压柴油机低速工况增压压力不足与瞬态涡轮迟滞问题,开展了车用柴油机电动增压器稳态与瞬态控制策略研究。仿真结果表明,电动增压器可以显著提高增压压力,明显改善低速稳态性能:电动增压器转速为65000r/min时,800r/min满负荷工况燃油消耗率可降低8%;电动增压器转速为55500r/min时,800r/min工况提高喷油量至108.5mg/cycle,扭矩可以提高27.06%。随着发动机转速的提高,电动增压器转速应逐渐减小,1400r/min及以上转速时应将其旁通,且动力性控制策略中的电动增压器转速应比经济性控制策略中的低。探究了定负荷加速过程的控制策略,结果表明,随着负荷的下降,电动增压器阶跃转速维持时间应逐渐减小,100%负荷响应性指标K提高了49.54%。
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 lowspeed steady-state performance significantly.The specific fuel consumption reduces by 8%under the full-load condition of800 r/min when the electric supercharger runs at 65000 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 55500 r/min.The electric supercharger shall gradually decrease the speed with the increase of engine speed and shall be bypassed beyond 1400 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.
作者
宋彦苹
程江华
程振宇
郭文君
石磊
邓康耀
SONG Yanping;CHENG Jianghua;CHENG Zhenyu;GUO Wenjun;SHI Lei;DENG Kangyao(Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;National Key Laboratory of Diesel Engine Turbocharging Technology,China North Engine Research Institute,Tianjin 300400,China)
出处
《车用发动机》
北大核心
2022年第3期51-58,共8页
Vehicle Engine
基金
国防基础科研资助项目(2019-2021)。
关键词
电动增压
低速性能
控制策略
仿真
柴油机
electric supercharging
low-speed performance
control strategy
simulation
diesel engine
