A hill-climbing shift strategy for a two-speed automatic transmission vehicle

Abstract

The invention discloses a climbing gear shifting strategy of a two-gear automatic transmission vehicle. The climbing gear shifting strategy of the two-gear automatic transmission vehicle comprises thefollowing steps that in the running process of the vehicle, in combination with the real-time rotating speed and torque of a driving motor and data of a ramp sensor, the mass of the vehicle in the current state is obtained through calculation by means of a vehicle dynamics model; the maximum vehicle speed Vmax which can be reached by each gear of the vehicle in the current state according to rampinformation and the mass of the current vehicle calculated in step 1 in combination with a driving Map theory of the vehicle driving motor; and a vehicle gear shifting strategy in the climbing process is selected according to the maximum vehicle speed Vmax calculated in step 2 and reference on the optimal gear shifting vehicle speed point of the vehicle. According to the climbing gear shifting strategy of the two-gear automatic transmission vehicle, the gear shifting strategy is simpler, gear selection is optimized, frequent gear shifting on a ramp is avoided, and driving comfort is improved.

Description

technical field [0001] The present invention relates to a gear shifting strategy of an electric vehicle, more specifically a climbing gear shifting strategy of a two-speed automatic transmission vehicle. Background technique [0002] With the rapid development of new energy vehicles, people have higher requirements for the comfort and reliability of the vehicle, and the shift speed point of the electric vehicle matched with the automatic transmission is usually based on the external characteristics of the drive motor and the speed ratio of each gear. Optimal calculation to obtain the optimal shifting speed, reducing the frustration during the shifting process. However, when the vehicle is driving on a slope, the speed of the vehicle will often change due to changes in the slope and load, which will cause the vehicle to shift gears frequently, which will affect the ride comfort of the passengers, and will affect the operation of the automatic transmission in the long run. Th...

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a climbing and shifting strategy for a two-speed automatic transmission vehicle to solve the problem that the existing climbing strategy has a certain influence on the climbing performance of the vehicle and is relatively complicated, and is not suitable for a two-speed automatic transmission at the same time. Disadvantages such as electric vehicles

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