柴油机电动增压稳态与瞬态工况控制策略研究

宋彦苹; 程江华; 程振宇; 郭文君; 石磊; 邓康耀

doi:10.3969/j.issn.1001-2222.2022.03.008

车用发动机 >

2022 , Vol. 0 >Issue 3: 51 - 58

DOI: https://doi.org/10.3969/j.issn.1001-2222.2022.03.008

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柴油机电动增压稳态与瞬态工况控制策略研究

宋彦苹 ,
程江华 ,
程振宇 ,
郭文君 ,
石磊 ,
邓康耀

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(1.上海交通大学动力机械及工程教育部重点试验室，上海 200240；2.中国北方发动机研究所柴油机增压技术重点实验室，天津 300400)

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

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

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(1.Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;2.National Key Laboratory of Diesel Engine Turbocharging Technology，China North Engine Research Institute，Tianjin 300400，China）

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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65 000 r/min时，800 r/min满负荷工况燃油消耗率可降低8%；电动增压器转速为55 500 r/min时，800 r/min工况提高喷油量至108.5 mg/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，1 400 r/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%。

关键词： 电动增压; 低速性能; 控制策略; 仿真; 柴油机

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宋彦苹 , 程江华 , 程振宇 , 郭文君 , 石磊 , 邓康耀 . 柴油机电动增压稳态与瞬态工况控制策略研究[J]. 车用发动机, 2022 , 0(3) : 51 -58 . DOI: 10.3969/j.issn.1001-2222.2022.03.008

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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