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Anti-slip auxiliary control method for new energy automobile

A new energy vehicle, auxiliary control technology, applied in electric vehicles, control drive, power management and other directions, can solve the problem of not being able to stay on the slope for a long time, and achieve the effect of saving energy and improving comfort and safety

Active Publication Date: 2021-01-26
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical defect that the current motor ramp assist technology cannot hold the slope for a long time, and provides a ramp assist system and control method that can work for a long time, is convenient to use, and has reliable performance.

Method used

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  • Anti-slip auxiliary control method for new energy automobile
  • Anti-slip auxiliary control method for new energy automobile
  • Anti-slip auxiliary control method for new energy automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see figure 2 , the new energy vehicle anti-slope auxiliary control method of the present invention, its process is:

[0048] When the anti-slope system recognizes the start-up slope condition, it aims to control the motor speed to 0, and controls the motor to output the locked-rotor torque to prevent the slope;

[0049] When the anti-slope system recognizes that the motor anti-slope overtime or the electric drive system fails to maintain the anti-slope stall torque, and the vehicle does not start or the brake is applied or the handbrake is applied, the vehicle body stability controller controls the brake execution The device outputs the driving braking force to prevent the slope from slipping;

[0050] When the anti-slope system recognizes that the anti-slope of the body stability controller has timed out and the vehicle has not stepped on the brake or pulled the handbrake, it controls the electronic parking controller to control the parking slope, and the electronic pa...

Embodiment 2

[0068] Compared with Embodiment 1, the new energy vehicle anti-slope auxiliary control method of this embodiment further defines the specific implementation steps as follows:

[0069] s1, Detect vehicle status: collect gear position, accelerator pedal opening, brake pedal switch and motor speed signals;

[0070] s2, judging whether the vehicle is in the start-up slope condition:

[0071] When the vehicle gear is in the forward gear and the brake is not applied, and the motor speed is less than a preset negative speed limit n1 (for example -10rpm); if yes, go to step S3; if not, go back to step S1;

[0072] S3, control the motor anti-slope and timing: according to the motor speed, PI controls the output motor target torque T_FLP; and starts timing the motor anti-slope time t_Mot;

[0073] S4, judging whether the vehicle is started or the brake is stepped on or the handbrake is applied: whether the accelerator pedal is depressed and the driving force is greater than the sum of ...

Embodiment 3

[0082] The new energy vehicle anti-slope auxiliary control method of this embodiment is different from Embodiment 2 in that: in step S3, the control flow of timing after entering the motor anti-slope is as follows:

[0083] When it is judged that the vehicle starts to slide downhill (when the vehicle gear is in the forward gear, and the brake is not applied, and the motor speed is less than a preset negative speed limit n1), start timing; When the slope flag is invalid, stop timing;

[0084] The calculation method of the motor anti-slope activation flag is as follows:

[0085] The sign bit S is the sign bit of the vehicle's starting downhill condition, and the judgment conditions are: the vehicle gear is in the forward gear, and the brake is not stepped on, and the motor speed is less than a preset negative speed limit n1;

[0086] The flag bit R is the motor anti-slope automatic exit flag, and the judgment condition is the electric drive system failure or the motor anti-slop...

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Abstract

The invention discloses an anti-slip auxiliary control method for a new energy automobile, and the method comprises the steps: controlling a motor to output a locked-rotor torque for preventing slip after an anti-slip system recognizes a starting slip condition; when the motor anti-slip overtime occurs or an electric drive system fails to maintain the anti-slip locked-rotor torque, and the automobile is not started or a brake is stepped down or a hand brake is pulled up, by a vehicle body stability controller, controlling a brake actuator to output driving braking force to prevent slip; when the anti-slip system recognizes that the anti-slip of the vehicle body stability controller is overtime and the automobile still does not step on a brake or pulls on a hand brake, controlling an electronic parking controller to perform parking control, and controlling the brake actuator to continue to output mechanical brake force for parking by the electronic parking controller; and when a driveroperates the automobile to start or step on a brake or pull up a hand brake, automatically releasing motor locked-rotor torque or mechanical braking force by the system. The problem that the reliability of the ramp auxiliary function is insufficient due to the fact that slope slipping is prevented only through a motor is solved, and the operation comfort and safety of a driver are greatly improved.

Description

technical field [0001] The invention relates to the anti-slip auxiliary control method of a new energy vehicle, in particular to an anti-slope auxiliary control method of a new energy vehicle with an electric drive system. Background technique [0002] With the promotion of new energy vehicles, electric drive technology is more and more widely used in the automotive field. However, when the vehicle stops and restarts during the climbing process, the driver needs to step on the accelerator immediately after releasing the brake, otherwise the vehicle will slip back under the action of its own gravity. For unskilled drivers, they tend to be in a hurry and are prone to accidents. Since the torque output of the motor has the characteristics of fast response, it can be considered to apply a driving force that can balance the vehicle's slope resistance in the opposite direction of the vehicle's backward slide through the motor stall, so that the vehicle can be stationary on the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/18B60L15/20
CPCB60W30/18118B60L15/2018Y02T10/72
Inventor 吴浩魏广杰游道亮彭永涛龚俊奇杨克文
Owner JIANGLING MOTORS
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