A control method for hydraulic torque converter lock-up clutch under the condition of rapid acceleration

Abstract

The invention relates to a method for controlling the locking clutch of a hydraulic torque converter under the condition of abrupt throttle. At the time point T3 in the oil control pressure increase stage, the driver's sudden operation of the accelerator was detected, and the operating conditions were established, and the control operation was completed in turn; three control stages were added, including stage 1, stage 2, and stage 3, and within stage 1 The oil pressure value of the lock-up clutch control decreases from the oil pressure value A at the time point T3 to the oil pressure B at the half-engagement point of the lock-up clutch. During this process, the speed of the pump impeller increases due to the sudden increase of the engine torque, and the lock-up clutch controls the oil pressure. The drop can buffer the clutch lock-up acceleration effect caused by the sudden fuel valve, and avoid the impact caused by the rapid clutch engagement; the second and third stages have a complete and timely limiting effect on the speed of the pump impeller to prevent the adjustment of the speed of the pump impeller. Increased transition or latching process time.

Description

technical field [0001] The invention relates to a control method for a lock-up clutch of a hydraulic torque converter. Background technique [0002] The torque converter lock-up clutch control can optimize the lock-up area of ​​the torque converter, reduce the loss of hydraulic transmission as much as possible, and improve the fuel economy of the vehicle. At present, the relevant mature control technologies include the torque converter lock-up strategy control to precisely control the unlocking timing of the torque converter, and the torque converter slip-friction control strategy to control the lock-up process of the torque converter lock-up clutch. Precise control. Based on these mature technologies, the hydraulic torque converter can complete the lock-up of the clutch at the right time with the smoothest control process. However, there is no special control scheme for some special working conditions with a low probability of occurrence, such as sudden gas acceleration o...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a hydraulic torque converter under the condition of rapid refueling, which can effectively solve the problem of decreased driving comfort of the whole vehicle caused by the sudden refueling operation of the lock-up clutch during the lock-up control process when the car is in the state of deceleration and coasting. Lock-up clutch control method

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