Clutch self-calibration method of hybrid electric vehicle and application of clutch self-calibration method

Abstract

The invention relates to a clutch self-calibration method of a hybrid electric vehicle and application of the clutch self-calibration method. The clutch self-calibration method includes the steps that whether the hybrid electric vehicle meets a self-calibration condition or not is judged; a clutch is completely separated, and a neutral gear of a gearbox is engaged; according to the travel working condition, the calibration mode suitable for the rotation speed or the calibration mode suitable for the torque is selected, and the position of a half-engaged point of the clutch is observed and recorded when a calibration parameter reaches a threshold value; a motor is detached, the clutch is gradually separated, the whole vehicle is powered off, and calibration is finished. By the adoption of the method, the calibration mode suitable for the rotation speed or the calibration mode suitable for the torque can be selected according to the travel working condition, the position of the half-engaged point of the clutch is observed and recorded when the calibration parameter reaches the threshold value, the position of the half-engaged point of the clutch is automatically calibrated with the assistance of existing equipment of the whole vehicle, and the interference factors of a sensor in the actual working condition can be avoided as well.

Description

technical field [0001] The invention relates to the technical field of clutch self-calibration of a hybrid vehicle, in particular to a clutch self-calibration method of a hybrid vehicle and an application thereof. Background technique [0002] Usually, we call the clutch position when the torque transmitted by the clutch begins to overcome the resistance torque of the vehicle and start as the half-engagement point of the clutch. The position parameters of the clutch half-engagement point are often used in the command control of the vehicle controller HCU or the transmission controller TCU to the transmission actuator, and are also often used in the dynamic model analysis of the transmission shift process, so it has important research significance. During the long-term use of single-shaft parallel hybrid electric vehicles, the position of the half-engagement point of the clutch will change due to factors such as wear and temperature difference, resulting in insufficient clutc...

AI Technical Summary

Problems solved by technology

This method does not strictly define the concept of the half-engagement point of the clutch, and what it finally measures is the clutch position when the master and slave discs are synchronized, rather than the clutch position (that is, the half-engagement point position) when the car overcomes the driving resistance and starts to start. Calibration error, and this error is not enough to be ignored relative to the amount of clutch wear; moreover, this method does not make full use of the existing control equipment (such as HCU, TCU, etc.) of the vehicle, but sets a special calibration device, This inevitably increases the weight and cost of the vehicle; in addition, it is worth mentioning that the clutch position sensor is easily affected by force majeure factors such as vehicle vibration, temperature changes, and electromagnetic interference, and this method does not provide circumvention measures to improve measurement accuracy

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