Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope

Abstract

The invention provides a combinational control method of gear shift by an automatic mechanical transmission (ATM) system of an electric automobile running on an upslope. The method comprises the following steps: a control system of a motor drive system monitors in real time and stores motor rotating speed; when shifting gear, the AMT system sends a gear shift effective signal to the motor drive system; after the AMT system has finished gear shift, the motor drive system uses the speed difference before and after gear shift to calculate slope gradient, and thereby calculating the current running resistance of the automobile; the motor drive system performs calculation according to the current running resistance and the maximal torque of the motor drive system to obtain a required variable peed ratio of the AMT when the automobile currently runs; and the motor drive system sends the variable speed ratio obtained by calculation to the AMT system, and then the AMT system regulates the gear of the automobile. Therefore, by adopting the method provided by the invention, successful gear shift can be realized when the electric automobile is running on the upslope, and running smoothness of the automobile can be improved.

Description

technical field [0001] The invention relates to the field of driving electric vehicles, in particular to a comprehensive shift control method for an electric vehicle driving system configured with an AMT transmission system when traveling uphill. Background technique [0002] When the vehicle is running uphill, the resistance it receives is different from that of ordinary driving. In some cases, the slope resistance may become the main component of the vehicle resistance. At the same time, when the vehicle is driving uphill, passability has become the main purpose of the vehicle, while acceleration and economy take second place. Therefore, the choice of gear at this time is different from that on flat roads, and different slopes correspond to different shift strategies. In the literature "AMT vehicle ramp shift strategy and experimental research", the uphill shift strategy is studied for the car with the transmission system composed of internal combustion engine and AMT. Th...

AI Technical Summary

Problems solved by technology

If the AMT system adopts the usual gear shift strategy when the electric vehicle is driving uphill, it may result in poor driving comfort of the vehicle due to the problem of gear selection, and it is even more likely that the driving force of the vehicle will be insufficient due to improper gear shifting. And produce the serious safety problem of sliding car

Images