Method for controlling manual gear shift of automatic transmission

Abstract

The invention discloses a method for controlling manual gear shift of an automatic transmission. The method is characterized in that according to the performances of an engine, the maximum rotation speed valve of the engine of each shift, to which the transmission can be reduced, is restricted; when down shift is carried out by a driver, if the current rotation speed of the engine is too high, when the transmission reduces to the low shift, the rotation speed of the engine is higher than the restriction shift, explosion accident may occur on the engine, if so, inconvenience may be brought to the driver of the vehicle, and certain damage can be caused to the engine. So according to the performances of the engine, the maximum rotation speed valve of the engine of each shift, to which the transmission can be reduced, is restricted, when down shift is carried out by the driver, if the rotation speed of the engine is higher than the restricted maximum rotation speed of the engine, the gear shift requirement is neglected, thus the engine can be protected effectively, and the occurrence of damage accident of the engine caused by the subjective faulty operation by the driver is avoided.

Description

technical field [0001] The invention relates to the field of transmissions, in particular to a manual shift logic control method of an automatic transmission. Background technique [0002] In the vehicle power transmission system, the automatic transmission has several determined speed ratios. There is a read-only memory in the transmission controller, which stores one or more shift logics, corresponding to the speed ratio under different output speed and torque requirements. The shift schedule is automatically selected, usually by a gear ratio that corresponds to the current output speed and torque requirements. Recently, a manual shift mode has been developed in automatic transmissions. In such an automatic transmission, the upshift or downshift from the current gear to other gears can be adjusted manually. In addition to the automatic shift mode, there is also a position for manual shift mode on the manually operated shift lever. The manual shift mode of the shift leve...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the problem that the manual shift control method of the automatic transmission in the prior art does not take into account the driver's technical limitations and whether the driver's shift timing is correct, and once the driver makes a wrong operation, the engine will be damaged. Provided is a manual shift control method for an automatic transmission, which can overcome the driver's lack of driving skills, and avoid engine damage due to excessive speed when downshifting in terms of driving flexibility

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