基于前馈的柴油机冷却液温度控制策略研究  

Study on Diesel Engine Coolant Temperature Control Strategy with Feedforward

作　　者：刘震涛[1] 尹旭[1] 韩松[1] 孙正[1] 俞小莉[1] 

机构地区：[1]浙江大学动力机械及车辆工程研究所,杭州310027

出　　处：《内燃机工程》2013年第4期7-12,共6页Chinese Internal Combustion Engine Engineering

摘　　要：采用集总参数法建立了增压柴油机冷却系统模型,对增压柴油机冷却系统控制策略进行了研究。通过热平衡试验验证了该冷却系统模型的准确性。在冷却系统模型的基础上基于冷却系统附件功耗最低的原则,设计了增益可变的PI反馈控制加前馈模块的冷却液温度控制策略,并与广泛应用的电磁离合器控制冷却系统及传统机械式冷却系统进行仿真计算对比。研究结果表明:采用MAP前馈-PI反馈的冷却系统控制策略在C-WTVC循环下能将冷却液温度波动控制在±1℃范围内;相对电磁离合器控制式冷却系统,该控制策略使冷却系统功耗在市区循环、公路循环、高速循环下分别下降66.5%、67.3%、45.1%,冷却系统性能得到明显改善。A turbocharged diesel engine cooling system model was established by using lumped parameter method to study control strategy of the engine cooling system. Proved to be correct by heat balance test,this model was used to work out the control strategy of coolant temperature in accordance with the principle of minimizing parasitic loss of cooling system accessories. The control strategy consisting of variable gain PI feedback module and feedforward module was proposed. Comparisons of simulation results of the cooling system adopting the proposed strategy with those of now commonused electromagnetic clutch controlled and conventional mechanical controlled cooling systems show that coolant temperature fluctuation in the former can be controlled within ~I^C under C-WTVC driving cycle test. Its power consumption can be reduced by 66.5%,67.3% and 45.1% under urban,road and high-speed driving cycle test respectively than the electromagnetic clutch controlled system. Therefore, this control strategy can improve cooling system performance significantly.

关 键 词：内燃机 冷却液温度控制 前馈 反馈 仿真 

分 类 号：TK424.2[动力工程及工程热物理—动力机械及工程]