An optimization method of zero-crossing torque shock of motor for new energy vehicles

A technology of motor torque and new energy vehicles, which is applied in the field of vehicle impact resistance, can solve problems affecting driving comfort, etc., and achieve the effects of improving driving comfort, reducing vehicle impact, and improving comfort

Inactive Publication Date: 2019-01-08
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the positive and negative torque of the drive motor changes to zero, the abutment surface of the drive gear output from the motor to the reducer changes from one side against the teeth to the other side against the teeth, such as figure 1 As shown, at this time, due to the change of positive and negative torque, the impact of the vehicle caused by the change of the front and rear abutment surfaces of the drive gear seriously affects the driving comfort

Method used

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  • An optimization method of zero-crossing torque shock of motor for new energy vehicles
  • An optimization method of zero-crossing torque shock of motor for new energy vehicles
  • An optimization method of zero-crossing torque shock of motor for new energy vehicles

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Embodiment 1

[0025] The method for optimizing the zero-crossing impact of the motor torque of the new energy vehicle of the present invention, through the following steps, reduces the tooth impact of the driving gear:

[0026] 1) Detect the zero-crossing torque of the motor:

[0027] The motor torque zero crossing includes the motor positive torque to negative torque zero crossing and negative torque to positive torque zero crossing, and the zero crossing detection algorithm is used to detect the zero crossing point of the torque;

[0028] 2) After the torque zero-crossing point is detected, the slope of the torque rise or fall is limited to change the original change track of the torque, thereby achieving the purpose of reducing the impact of the torque zero-crossing.

[0029] Such as figure 1 As shown, the root cause of the zero-crossing impact of the motor torque is that when the torque crosses zero, the driving gear changes from one side to the other side of the tooth, resulting in a ...

Embodiment 2

[0031] The optimization method of the torque zero-crossing impact of the new energy vehicle motor in this embodiment is different from Embodiment 1 in that it further discloses the zero-crossing torque of the motor from positive torque to negative torque and from negative torque to positive torque. The detection process is as follows:

[0032] see Figure 2a , the vehicle controller (VCU) detects the driving motor torque in real time. When it detects that the current torque is less than zero, and the torque at the previous moment is greater than or equal to zero, and the torque window is greater than -5, it is judged that the current motor torque has a zero-crossing from positive to negative;

[0033] see Figure 2b The vehicle controller (VCU) detects the torque of the driving motor in real time. When it detects that the current torque is greater than zero, and the torque at the previous moment is less than or equal to zero, and the torque window is less than 5, it is judged...

Embodiment 3

[0036] The optimization method of the new energy vehicle motor torque zero-crossing impact in this embodiment is different from Embodiment 1 or Embodiment 2 in that: the process of controlling the slope of the torque change is divided into three stages: no zero-crossing processing, and directly output the current torque ;

[0037] There are positive to negative zero crossings, the slope of the limit torque reduction, 0.2 ~ 0.3 NM per cycle;

[0038] There is a negative to positive zero crossing, limiting the slope of torque growth, 0.2 to 0.3 NM per cycle.

[0039] Figure 5 is a schematic diagram of torque optimization in the present invention; Figure 6 Torque Control Slope Optimization Curve.

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Abstract

A method for optimize that zero-crossing torque shock of a motor of a new energy vehicle settles a problem of vehicle impact caused by the change of front and rear abutment surfaces of driving gears in the driving process of new energy vehicle, and the abutment impact of driving gears is reduced. The method comprises the steps of detecting the zero crossing torque of motor; wherein the zero crossing torque of motor includes zero crossing from positive torque to negative torque and zero crossing from negative torque to positive torque, and detecting a zero crossing point of torque by means of azero crossing detection algorithm; after the zero crossing point of torque is detected, limiting the slope of the rising or falling torque to change the original change trajectory of torque so as toachieve the purpose of reducing the zero crossing impact of torque and improving the driving comfort.

Description

technical field [0001] The invention relates to a vehicle impact resistance method, in particular to an optimization method for motor torque zero-crossing impact. Background technique [0002] At present, with the serious problem of environmental pollution, the state has issued a series of policies to encourage the development and development of new energy vehicle technology. Since the new energy vehicle is driven by a motor, there is an energy recovery condition during the motor drive process, the driving torque in the forward direction of the vehicle is positive, and the recovery torque is negative. When the driver steps on the accelerator, the positive torque drives the motor to rotate forward. When the driver releases the accelerator, it is in the energy recovery condition. The motor responds to the negative torque to recover energy, resulting in positive and negative changes in the motor torque, and the torque crosses zero. When the positive and negative torque of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20B60R16/02B60R16/037
CPCB60L15/20B60R16/02B60R16/037Y02T10/72
Inventor 胡松华刘伟东
Owner JIANGLING MOTORS
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