CAJ | 학술논문

为了提高无级变速汽车液力变矩器工作的燃料经济性,确定了液力变矩器锁止、解锁的合理条件.为了提高液力变矩器解锁时的工作效率,利用无级变速器速比调节功能,设计了PID控制器,使得发动机-液力变矩器始终工作在最佳经济区域.为了减少液力变矩器锁止时的冲击,以允许冲击度范围内滑磨功最小与发动机稳定运转2个原则,提出了锁止离合器接合的控制策略,设计了以冲击度和发动机转速差为输入量的模糊控制器.两种不同锁止情况试验结果表明:急加速(1.92 s)比缓加速(1.38 s)延长了接合时间,因此,利用控制策略能够保证锁止离合器接合平稳和发动机的稳定运转.
위료제고무급변속기차액력변구기공작적연료경제성,학정료액력변구기쇄지、해쇄적합리조건.위료제고액력변구기해쇄시적공작효솔,이용무급변속기속비조절공능,설계료PID공제기,사득발동궤-액력변구기시종공작재최가경제구역.위료감소액력변구기쇄지시적충격,이윤허충격도범위내활마공최소여발동궤은정운전2개원칙,제출료쇄지리합기접합적공제책략,설계료이충격도화발동궤전속차위수입량적모호공제기.량충불동쇄지정황시험결과표명:급가속(1.92 s)비완가속(1.38 s)연장료접합시간,인차,이용공제책략능구보증쇄지리합기접합평은화발동궤적은정운전.
In order to improve the operating fuel economy of torque converter for vehicle with continuously variable transmission(CVT) system, the optimal lock-up and unlocking conditions were confirmed. To furtherly improve the work efficiency of torque converter in unlocking stage, PID controller was designed, so that engine and torque converter worked in optimal economy region by adjusting the speed ratio of CVT. To decrease the impact during the lock-up process of torque converter, the control strategies of lock-up clutch engagement were put forward according to the principles of stabilizing engine rotation and optimizing the performance of impact and sliding friction work, and the fuzzy controller with two inputs of impact degree and rotate speed difference was designed. The experimental result under two kinds of different lock-up states shows that the 1.92 s in quick acceleration is bigger than the 1.38 s in slow acceleration, the engagement time is prolonged, so the control measures can ensure the engaging smoothness of torque converter and stabilize engine rotate speed. 6 figs, 11 refs.