Abstract
Considering the requirements of dynamic performance and quality during the torque converter locking process, a two parameters latch-up control strategy was designed, and a simulation method to study the control performance by use of processor in loop (PIL) simulation technology was proposed. Through the study of the practically applied requirements of a loader, a two parameter lock-up control strategy with turbine speed signal and gear signal as main control parameters was developed. According to the control strategy, the logic diagram of real-time locking and unlocking control of the latch-up clutch was established by using Matlab/Simulink. Then, PIL technology was used to realize the co-simulation of CCS and Simulink. Simulation results show that the latch-up control model is correct and the lock-up clutch can effectively lock and unlock in accordance with the lock-uprule.
Highlights
Lock-up control law of the torque converterThe rule of latch-up control is generally divided into single parameter control and two parameters control
Considering the requirements of dynamic performance and quality during the torque converter locking process, a two parameters latch-up control strategy was designed, and a simulation method to study the control performance by use of processor in loop (PIL) simulation technology was proposed
In order to reduce the fuel consumption of torque converter, a controllable latch-up clutch is installed between the pump wheel and the turbine of the torque converter
Summary
The rule of latch-up control is generally divided into single parameter control and two parameters control. The integrated locking rule designed of the loader was as follows: 1)Whether the clutch would lock or not is determined by the turbine speed in the braking state; 2)In the steering condition, the unlocking of the latch-up clutch is determined by throttle angle, and the latch-up clutch is not locked when the throttle angle is less than 20%; 3)Locking would prevent the shift from running smoothly when shifting, so the lock-up clutch needs to be unlocked; 4)Whether the latch-up clutch would lock or not can be judged by the rotation speed of the turbine when not to change gear; 5)According to different gears and using purposes, at the first gear, the clutch must be unlocked in order to obtain greater torque for starting, climbing, and high power; at the second gear, the locking is determined by the throttle angle. When the throttle angle is less than 20%, the clutch is unlocked in order to obtain greater torque; when the throttle angle is more than 20%, whether the clutch would lock or not is judged by the rotation speed of the turbine and the throttle angle in order to make the vehicle more efficient; At the third gear, the clutch needs to be locked in order to make the vehicle get higher speed and larger utilization of power
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