Method and device for controlling gear shift of mechanical transmission

Abstract

The invention provides a speed change control method and device of a mechanical gearbox without vibration caused by disengagement of gears and shortening time of speed change. The speed change control device has an internal combustion engine torque control unit (S10) that controls the internal combustion engine torque generated by the internal combustion engine so that the transmission torque of the friction clutch is 0 or near it when there is a speed change request from the mechanical gearbox; through the internal combustion engine torque A control unit to control the torque of the internal combustion engine, a gear shift allowing unit (S12) that allows the mechanical transmission to shift gears when the transmission torque is 0 or near it; The speed change execution unit (S16) that executes disengagement of the gear and engagement of the gear under the state.

Description

(1) Technical field [0001] The invention relates to a speed change control method and device of a mechanical gearbox, in particular to a technique for performing speed change without clutch operation of a friction clutch. (2) Background technology [0002] As vehicle transmissions, automatic transmissions with variable speed switching operations are widely used. However, for large vehicles such as passenger cars and trucks, due to the large amount of transmission of driving torque, it is difficult for a hydraulic torque converter to completely transmit the driving torque. Therefore, for example, The shifting operation of the manual mechanical transmission is changed to a mechanical transmission with an automatic structure. [0003] The structure of the mechanical gearbox is to automatically implement disengagement and engagement of the gear to complete the speed change, and the structure of the friction clutch is also to automatically perform the clutch operation simultaneou...

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Problems solved by technology

[0004] However, in the case of a mechanical transmission that automatically controls the friction clutch at the same time as shifting, since it is difficult to perform subtle control in the half-clutch state, there is a problem that the time during which the driving force cannot be transmitted to the wheels after the friction clutch is cut off varies. Long, I feel that it takes a long time to implement the shift

[0008] As mentioned above, if the disengagement of the gear is carried out without the transmission torque being completely cut off, in the case of relatively high transmission torque, vibrations will occur due to the disengagement of the gear, which will make the occupant feel uncomfortable, which is not a good thing matter

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