A Gear Shift Strategy Suitable for Vehicles with Automatic Transmission Uphill

Abstract

The present invention provides a shifting strategy suitable for climbing a vehicle with an automatic transmission. When the opening of the accelerator pedal is greater than the target setting value and the longitudinal acceleration of the vehicle is less than the target setting value, the current vehicle speed of the vehicle is judged: when the actual When the vehicle speed is less than the shifting speed, the vehicle is in the climbing state and the original shift strategy is maintained; when the actual speed is between the shifting speed and the maximum speed of the first gear, the vehicle is in the climbing state, and the gear position of the vehicle is controlled at First gear and limit the maximum vehicle speed of the vehicle; when the actual vehicle speed is greater than the maximum speed of the first gear, the vehicle maintains the original shift strategy. The present invention uses the acceleration pedal signal and the vehicle longitudinal acceleration value to correct the shifting strategy in the process of vehicle climbing without additional use of other instruments and equipment, without additionally increasing the cost of vehicle components , while avoiding frequent shifting of the vehicle during the climbing process, thereby improving the driving comfort of the vehicle.

Description

technical field [0001] The present invention relates to a gear shifting strategy of an electric vehicle, more specifically a gear shifting strategy suitable for climbing an 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 comfort of the passengers and will affect the performance of the automatic transmission in the long run. There...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a climbing and shifting strategy for an automatic transmission vehicle to solve the disadvantages of the current correction method of the shifting strategy by means of auxiliary equipment to judge the current state of the vehicle and calculate the vehicle demand, which leads to an increase in the cost of parts and components of the whole vehicle.

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