Gear shifting control method and system based on intelligent driving

Abstract

The invention discloses a gear shifting control method based on intelligent driving, and the method comprises the steps: calculating a wheel end torque required for maintaining a target vehicle speed during downhill based on a vehicle motion equation; based on the power assembly calibration data, engine working conditions for maintaining the current vehicle speed under different gears are calculated; when additional braking force needs to be applied, vehicle speed control is completed through a control mode combining downshift reverse towing and braking of a braking system, and the method specifically comprises the following steps that based on an engine mechanical loss test, engine mechanical loss torque under the engine working condition is obtained; the wheel end reverse towing torque is calculated; gear information that the wheel end reverse dragging torque is smaller than the needed wheel end torque is obtained; a proper gear is selected for reverse towing control; and calculating additional braking torque needing to be applied, and sending a braking instruction to a braking system to enable the vehicle to maintain the target vehicle speed. The service life and the safety of the brake system can be effectively improved.

Description

technical field [0001] The present invention relates to an adaptive cruise control system (ACC, Adaptive cruise control), in particular to a shift control method and system based on intelligent driving. Background technique [0002] In the ACC system, sensors such as radar and cameras measure the head-to-head distance, relative speed, and relative acceleration between the vehicle and the vehicle ahead, and provide relevant information to the electronic control unit. The electronic control unit determines the driving state of the main vehicle according to the safety distance and cruising speed set by the driver, combined with the information sent by the radar. [0003] 1) When there is no driving vehicle in front of the vehicle, the vehicle will be in a normal cruising driving state, and the electronic control unit can automatically control the power output of the entire vehicle by controlling the electronic throttle of the engine according to the setting information. [000...

AI Technical Summary

Problems solved by technology

[0005] When the vehicle is in ACC adaptive cruise, since the braking force provided by the braking system is used for deceleration control, in this control mode, when the vehicle is going downhill, especially when the slope is too large, it needs to apply a large braking force for a long time. The target vehicle speed can only be maintained by power, which may lead to excessive wear of the brake system, and may even cause the brake system to fail, causing traffic accidents

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