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Automatic slope parking method for electric vehicles

A technology for electric vehicles and parking on slopes, applied in electric vehicles, electric vehicle charging technology, power management and other directions, can solve the problem of high cost, and achieve the effect of reducing costs and improving driving safety and comfort.

Active Publication Date: 2021-08-17
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ESP system will generally bring a cost of about 1,000 yuan to the whole vehicle, especially for low-speed pure electric vehicles, the cost is still relatively high

Method used

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  • Automatic slope parking method for electric vehicles
  • Automatic slope parking method for electric vehicles
  • Automatic slope parking method for electric vehicles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The following will combine Figure 2-3 Introduce the content of the present invention in detail.

[0042] Such as figure 2 shown, combined with image 3 , an embodiment of the present invention provides an automatic parking method for an electric vehicle, comprising the steps of:

[0043] S1. Collect current working condition information and judge whether the current working condition satisfies the slope standing condition;

[0044] S2. If the current working condition meets the slope-holding condition, adjust the output torque of the motor to enter the slope-holding working condition;

[0045] S3. If the current working condition changes and the slope-holding condition is no longer satisfied, exit the slope-holding working condition.

[0046] First, step S1 is executed to collect current working condition information, and judge whether the current working condition satisfies the standing slope condition.

[0047] Among them, the current working condition informat...

Embodiment 2

[0077] In step S2 of the first embodiment, the position closed-loop control method of the motor is used to adjust the motor torque, but the adjustment method of the motor torque is not limited to this, and the position closed-loop control in the first embodiment can also be replaced by a speed closed-loop control.

[0078] Based on this, in step S2, the output torque of the motor is adjusted through the speed closed-loop control to enter the standing slope condition, that is, through the PI control of the speed loop, the drive motor outputs a positive torque, so that the speed of the electric vehicle drops to zero, And complete the standing slope function.

[0079] In the same way, in the process of the electric motor controller (PEU) identifying the reverse rotation, the rotation speed of the motor is differentiated to obtain the reverse acceleration of the electric vehicle, and according to the self-weight, wheel diameter, and transmission speed of the electric vehicle, Calc...

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Abstract

The invention discloses an automatic slope-holding method for an electric vehicle, which comprises the steps of: collecting current working condition information, judging whether the current working condition satisfies the slope-holding condition; if the current working condition satisfies the slope-holding condition, adjusting the output torque of the motor , enter the slope-holding working condition; if the current working condition changes and the slope-holding condition is no longer satisfied, exit the slope-holding working condition. The present invention can obtain the command of the vehicle to park on the slope through the existing communication interface CAN of the motor controller software without increasing the extra hardware cost such as the ESP system, or through the inherent command of the vehicle controller, that is, the mode request and the torque request. Combined with the change of the motor's own position signal or speed signal, a reverse drive torque is generated to achieve the purpose of preventing the vehicle from rolling backwards, realize the automatic parking function, give the driver a better driving feeling and active safety performance, and improve driving comfort sense; and does not require hardware changes, reducing production costs.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to an automatic parking method for an electric vehicle. Background technique [0002] In low-cost pure electric vehicles, the electric drive system is mainly composed of drive motors, inverters and high-voltage batteries. In order to reduce costs, the anti-lock braking system (ABS system) required by regulations is mandatory for all vehicle manufacturers. However, the body electronic stability system (ESP system) with higher specifications is generally not installed. Correspondingly, functions such as automatic parking on slopes that can be realized by the ESP system cannot be completed by the braking system of pure electric vehicles. [0003] The automatic parking / uphill assist system is a function that automatically replaces the handbrake. When the vehicle is on a slope, it is subjected to the longitudinal force of gravity in the longitudinal direction, causing the vehicle t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20
CPCB60L15/2018B60L2240/10Y02T10/72Y02T90/16
Inventor 王宇孙可鲍明凯
Owner UNITED AUTOMOTIVE ELECTRONICS SYST