Slip frequency control method and temperature protection method for lockup clutch of torque converter

Abstract

The invention discloses a slip frequency control method for a lockup clutch of a torque converter. When an engine is started and an automobile is in a stationary state, a driver releases a handbrake, when the work condition is satisfied, the control operation is completed within four time periods, the starting process is intervened through the slip frequency control, the starting response speed is increased, the transmission system efficiency is improved, and accordingly the fuel economy is increased. The invention further provides a temperature protection method for the lockup clutch. The lower limit value T1 and the upper limit value T2 of the protection of a friction plate of the lockup clutch are set, and the temperature Tpm of the friction plate of the lockup clutch within the third time period and the fourth time period is calculated; and the temperature protection method for the friction plate of the lockup clutch is made, the friction plate can be protected and operate within the normal temperature range, and the service life of the friction plate is prolonged.

Description

technical field [0001] The invention relates to the field of torque converter lock-up clutch control, more specifically, the invention relates to a hydraulic torque converter lock-up clutch slip control method and a temperature protection method. Background technique [0002] As a starting device, a hydraulic torque converter is widely used in metal belt continuously variable transmissions and hydromechanical automatic transmissions. It can achieve stable low-speed driving and has torque amplification capabilities that other devices cannot provide, but there are also hydraulic forces The hydraulic transmission efficiency of the torque converter is low, the transmission system is flexibly connected through the torque converter, the engine power cannot be transmitted to the gearbox in time, resulting in slow acceleration response; and the load torque cannot directly act on the engine, resulting in high engine speed, Causes engine speed fluctuations, high working noise, and add...

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to design and develop a hydraulic torque converter lock-up clutch slip control method to solve the problem of long hydraulic transmission time of the hydraulic torque converter and low efficiency of the transmission system when the driver starts with a fixed accelerator pedal opening. , the problem of high engine speed and high noise, intervene in the starting process through slip control, improve the starting response, improve the efficiency of the transmission system, and then improve fuel economy

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