Hill starting control method for pure electric commercial vehicle based on real-time mass identification

A technology of real-time quality and hill start, applied in the direction of electric vehicles, control drives, control devices, etc., can solve problems such as running away, potential safety hazards, insufficient driving torque, etc., and achieve the goal of avoiding rolling and running, and avoiding stalling Effect
CN110626348AInactive Publication Date: 2019-12-31NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2019-12-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of control of commercial vehicles, and particularly relates to a hill starting control method for a pure electric commercial vehicle based on real-time mass identification. The hill starting control method comprises the following steps: judging whether the vehicle enters a hill starting mode or not; calculating hill gradient and vehicle mass after the vehicle enters the hill starting mode; and before an accelerator pedal is stepped on, keeping the vehicle static under the action of hydraulic braking force. After the accelerator pedal is stepped on, the sum ofdriving torque and braking torque is equal to hill equivalent torque; when motor torque is greater than motor stalling torque, the vehicle does not start, a motor controller controls the motor torquenot to increase along with the increase of the opening degree of the accelerator pedal until the opening degree of the accelerator pedal is increased to the state that the torque is greater than thehill equivalent torque, and braking torque is quickly removed. According to the method disclosed by the invention, after the accelerator pedal is stepped on, the motor driving torque, the braking torque and the hill equivalent torque are balanced, and thus, the circumstances that the motor is blocked and the vehicle moves suddenly and slips during starting are avoided.
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Description

technical field

[0001] The invention belongs to the field of commercial vehicle control, and in particular relates to a ramp-start control method for pure electric commercial vehicles based on real-time quality identification. Background technique

[0002] Regarding the hill start assist control method for pure electric commercial vehicles, the main methods currently used include: after the brake pedal is released, the brake applies a braking torque to prevent the car from rolling, and after the accelerator pedal is stepped on, the brake is removed after a certain period of time. moment. If the above method is not properly controlled, three abnormal situations will occur: the first one, remove the braking torque after a certain period of time, if the driving torque is too large, there will be a phenomenon of running away, causing a safety hazard; the second one, if you step on The opening of the accelerator pedal is not large enough, the driving torque is insufficient, and ...

Claims

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