基于喷油器卸压的柴油机轨压控制策略的研究  

Study of Control Strategy for Diesel Rail Pressure Based on Injector Relief

作　　者：周兴利[1] 韦雄[2] 冒晓建[2] 冯静[2] 梁锋[2] 

机构地区：[1]北京航空航天大学,北京100191 [2]广西玉柴机器股份有限公司,玉林537000

出　　处：《内燃机工程》2015年第4期36-40,共5页Chinese Internal Combustion Engine Engineering

摘　　要：针对轿车柴油机的特点提出了基于喷油器卸压的轨压控制策略,从多角度来提高轨压控制精度。在控制流入共轨管部分的燃油量上,研究并设计了基于实际轨压和目标轨压的闭环控制算法。在控制流出共轨管部分的燃油量上,设计了带自适应功能的喷油器卸压控制算法,可以在不增加任何辅助设备的情况下,通过软件方法解决油量控制阀控制的滞后性问题,提高了轨压的响应性,基于自适应的卸压算法确保了卸压控制的可靠性和稳定性。试验结果表明:控制策略在全工况下都具有很高的控制精度,轨压稳态偏差在±0.5MPa以内,瞬态偏差在±1.8MPa以内,满足了轿车柴油机更高轨压控制精度的要求。According to the characteristics of a car diesel engine,a new rail pressure control strategy based on injector pressure relief was proposed to improve rail pressure control accuracy in multiple perspectives.Firstly,in aspect of controlling the amount of fuel flowing into common rail tube,a closed-loop control algorithm for inlet mass unit（IMU）based on the actual and target rail pressures was designed.And then,in aspect of controlling the amount of fuel flowing out the common rail tube,an injector pressure relief control algorithm with adaptive function was designed,which reduced lag of IMU control and further improved response of rail pressure without adding any auxiliary equipment.The adaptive control algorithm of injector pressure relief makes the relief control reliable and stable.Finally,the proposed control strategy was verified on engine test bench.The test result shows that the control strategy has high control accuracy in all operating conditions with rail pressure deviation within±0.5MPa in stable operating conditions and within ±1.8MPa in transient operating conditions,meeting the requirements of higher rail pressure control accuracy for a car diesel engine.

关 键 词：内燃机 轿车柴油机 轨压控制 喷油器卸压 控制策略 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]