电动可变配气系统输出协方差控制策略  

Output Covariance Control Strategy of an Electric Variable Valve System

作　　者：张俊玮 刘波澜[1] 刘凡硕 张付军[1] Zhang Junwei;Liu Bolan;Liu Fanshuo;Zhang Fujun(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机学报》2024年第4期325-333,共9页Transactions of Csice

摘　　要：提出一种针对连续可变气门正时(VVT)的新型电动可变配气系统且基于模型的闭环控制,以提高系统调节速度和控制精度.首先,使用基于新息的自适应卡尔曼滤波参数辨识对电机系统参数进行辨识,利用辨识的参数建立了可变配气系统的控制模型.其次,设计了基于模型的电动可变配气系统控制算法,即输出协方差约束(OCC)算法.最后,验证了该算法的效果,在仿真中对比了OCC算法与比例-积分-微分(PID)算法、线性二次型跟踪(LQT)算法,在台架试验中对比了OCC控制器与PID控制器的控制效果,结果表明:对不同转速下目标相位调节进行仿真,PID算法在转速为1 000、3 000和4 000 r/min下稳态误差均大于OCC算法,LQT算法在转速为3 000 r/min和4 000 r/min下调节速度小于OCC算法,且在变转速下OCC算法相位保持更好,相位偏差更小,说明OCC算法相比PID算法和LQT算法具有更好的转速适应能力.台架试验中,在相位角向上调节时,OCC算法比PID算法响应时间降低了42.8%;在相位角向下调节时,OCC算法比PID算法响应时间降低了75.0%.In order to solve problems of slow response speed and poor adaptability to working conditions,a modelbased closed-loop control was proposed for the new type of electric variable valve system with continuously variable valve timing(VVT).Firstly,a parameter identification of Kalman filter based on innovation was used to identify the parameters of the motor system,and a control model of the variable gas distribution system was established using the identified parameters.Secondly,the output covariance constraint(OCC)control algorithm,a modelbased control algorithm for the electric variable valve system was designed.Finally,after verified,the OCC algorithm was compared with the proportion integration differentiation(PID)algorithm and the liner quadratic tracking(LQT)algorithm in the simulation,and the control effect of the OCC controller and the PID controller was compared in the bench test.The simulation analysis result of the target phase adjustment at different speeds shows that the steady-state error of the PID adjustment at 1000,3000,and 4000 r/min is greater than that of the OCC algorithm,and the adjustment speed of the LQT algorithm at 3000 r/min and 4000 r/min is smaller than that of the OCC algorithm,OCC algorithm has a better ability to maintain phase and less deviation at variable speeds.Compared with PID algorithm and LQT algorithm,OCC algorithm has better speed adaptability.The bench test result showed that,when the phase angle is adjusted upward,the response time of the OCC algorithm is reduced by 42.8%compared with the PID algorithm.When the phase angle is adjusted downward,the response time of the OCC algorithm is reduced by 75.0%compared with that of the PID algorithm.

关 键 词：电动可变配气 输出协方差控制 仿真分析 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]