Self-learning method and device for semi-junction point of locking clutch

Abstract

The invention discloses a self-learning method and device for a semi-junction point of a locking clutch. The method is applied to a power transmission system of a first test vehicle. In the case of the power transmission system, the power is transmitted sequentially in the order from an engine, a hydraulic torque converter with the locking clutch, a D / R clutch, a stepless speed regulator to a whole vehicle driving wheel. The method comprises the following steps that the first test vehicle is controlled to enter an idle state; the pressure of D / R clutch is adjusted to enable the speed difference between the turbine rotating speed and the pump wheel rotating speed of the hydraulic torque converter to be stabilized at a preset difference value; the pressure of the locking clutch is adjusted to enable the turbine rotating speed to rise so as to determine the starting time point when the turbine rotating speed begins to rise; and a first target pressure value of the locking clutch at the starting time point is determined. According to the method and the device, by adjusting the pressure of the D / R clutch and the pressure of the locking clutch, the starting time point for rising of the turbine rotating speed can be found more accurately, and then the semi-junction point of the locking clutch can be found more accurately.

Description

technical field [0001] The present application relates to the technical field of automobiles, in particular to a self-learning method and device for a half-engagement point of a lock-up clutch. Background technique [0002] The hydraulic torque converter is a hydraulic component composed of a pump wheel and a turbine, installed between the engine and the transmission, with hydraulic oil as the working medium, and plays the role of torque transmission, torque conversion, speed change and clutch. In the vehicle transmission system, a lock-up clutch is usually configured for the hydraulic torque converter, so that the power transmitted from the hydraulic force can be transferred to the frictional power transmission, thereby improving the power transmission efficiency. [0003] The function of the lock-up clutch is to lock the pump wheel and turbine of the hydraulic torque converter together, but to control the lock-up clutch from non-lock to lock, it is necessary to find the ha...

AI Technical Summary

Problems solved by technology

[0004] see figure 1 The schematic diagram of the self-learning of the half-engagement point position of the lock-up clutch is shown, t0 is the learning start time, t1 is the moment when the half-engagement point is learned, and t2 is the end time of learning. However, in the existing half-engagement point position learning method , when the vehicle is in an idle state, the speed difference between the pump wheel speed (ie, the engine speed) and the turbine speed is small, and it is difficult to find the accurate half-engagement point of the lock-up clutch by directly controlling the lock-up clutch

If the accurate half-engagement point is not found, in the actual control process of the lock-up clutch, it may cause the synchronization time of the pump wheel and the turbine wheel to be too long, resulting in excessive slipping of the lock-up clutch, and may also cause the synchronization of the pump wheel and the turbine wheel If the time is too short, it will cause vehicle impact and reduce driving performance

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