Real-time monitoring and controlling method for friction torque of dry clutch

Abstract

The invention relates to a real-time monitoring and controlling method and system for friction torque of a dry clutch. On the basis of the mechanical characteristic when a large end and a small end of a diaphragm spring are loaded simultaneously, displacement and acting force of the small end of the diaphragm spring are measured in real time by a sensor on an automobile, the purpose of monitoring the friction torque of the clutch in real time can be achieved, and the friction torque can further be controlled accurately according to the monitored friction torque. In a friction torque control process, current friction torque and controlled friction torque can be measured accurately, the friction torque control effect is ensured, and various problems caused during control of a black box system or a grey box system are avoided.

Description

technical field [0001] The invention relates to the technical field of automobile automatic control, in particular to a method for real-time monitoring and control of friction torque of a dry clutch. Background technique [0002] In the field of automobile automatic control technology, the friction torque transmitted by the clutch is a key parameter. The friction torque transmitted by the clutch has a direct relationship with the longitudinal impact of the vehicle, the friction work of the clutch friction plate and the temperature of the clutch friction plate. The measurement and control of clutch friction torque has always been a difficult point. At present, there are two methods to measure and control the friction torque of the clutch: the first is to use the nominal torque of the engine output by the electronically controlled engine and the engine speed; the second is to directly use the clutch release bearing displacement and The clutch friction torque relationship curv...

AI Technical Summary

Problems solved by technology

[0003] The measurement and control of the friction torque of the clutch through the engine nominal torque output by the electronically controlled engine and the engine speed have two disadvantages: ①It can only be used on the electronically controlled engine, and the scope of use is limited

②The calculation accuracy of the friction torque depends on the accuracy of the nominal torque of the engine, and the accuracy of the nominal torque of the engine is low

There are two disadvantages: ① The monitored friction torque will be affected by the wear of the friction plate: when the friction plate is worn, the initial displacement of the wave spring will change, which will lead to the change of the clutch release bearing displacement-friction torque curve, Therefore, the second option is only more accurate in the calibrated new car, and when the friction plate is worn out, the monitoring effect will be weakened

②The monitored friction torque will be affected by the temperature of the friction plate: during the process of friction plate sliding and grinding, the temperature of the wave spring will change, resulting in a change in its elastic characteristics, which in turn will cause the displacement of the clutch release bearing-friction torque curve to occur change, so the accuracy of the monitored friction torque is low

[0005] Using the elastic characteristics of the diaphragm spring, the elastic characteristics of the wave spring and the friction torque formula of the clutch to obtain the relationship between the displacement of the clutch release bearing and the friction torque, and then to measure and control, there are three shortcomings: ① This scheme only considers the axis of the wave spring The axial elasticity of the clutch cover and the possible transmission plate is neglected. Since the stiffness of the clutch cover and the transmission plate is on the same order of magnitude as that of the wave spring, it will lead to calculation errors of the friction torque

②The monitored friction torque will be affected by the wear of the friction plate: when the friction plate wears out, the initial displacement of the wave spring will change, which will lead to a change in the clutch release bearing displacement-friction torque curve, so the second option is only in It is more accurate in a calibrated new car, but when the friction plate is worn out, the monitoring effect will be weakened

③The monitored friction torque will be affected by the temperature of the friction plate: during the friction plate sliding and grinding process, the temperature of the wave spring will change, resulting in a change in its elastic characteristics, which in turn will cause the displacement of the clutch release bearing-friction torque curve to occur change, so the accuracy of the monitored friction torque is low

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