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Pulse heating current control method and system of power battery and electric automobile

A technology of pulse heating and current control, which is applied in the direction of battery/fuel cell control devices, electric vehicles, vehicle parts, etc., can solve problems such as gear wear, affecting the precise control and stability of pulse heating current, and pulse heating current deviation, etc., to achieve Effects of reducing current control deviation, stabilizing heating rate, and improving stability

Active Publication Date: 2022-07-26
深蓝汽车南京研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current common heating control schemes have the following problems: during the heating process, the output torque of the motor rotor is caused by the control error, which will cause gear wear; The deviation of the lower pulse heating current affects the precise control and stability of the pulse heating current

Method used

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  • Pulse heating current control method and system of power battery and electric automobile
  • Pulse heating current control method and system of power battery and electric automobile
  • Pulse heating current control method and system of power battery and electric automobile

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Embodiment Construction

[0043] like figure 1 , figure 2 As shown, the pulse heating current control method of the power battery in this embodiment is executed by the motor controller, and the method includes:

[0044] Step 1: Obtain the rotor angle θ of the motor and the expected RMS current of the pulse heating busbar, and then perform Step 2.

[0045] The motor rotor angle θ is detected by the resolver, and the resolver sends the detected motor rotor angle θ to the motor controller. The expected effective value of the pulse heating bus current is obtained by the battery management system by querying the preset temperature-ammeter according to the temperature of the power battery; the preset temperature-ammeter is the temperature of the power battery obtained through the calibration method and the expected pulse heating bus current is valid. Correspondence table of values. The battery management system sends the desired pulse heating bus current rms value to the motor controller.

[0046] Step ...

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Abstract

The invention discloses a pulse heating current control method and system for a power battery and an electric automobile, and the method comprises the steps: taking a motor rotor angle into consideration when determining a pulse heating current demand, and taking a direct-axis feed-forward current determined according to the motor rotor angle and an expected pulse heating bus current effective value as the pulse heating current demand; the current control deviation caused by the motor rotor angle can be reduced; a direct-axis feed-forward current Idini and a direct-axis actual current effective value Idfb are adjusted through PI to output a direct-axis voltage request value Udreq, a preset quadrature-axis target current Iqtag and a quadrature-axis actual current effective value Iqfb are adjusted through PI to output a quadrature-axis voltage request value Uqreq, closed-loop accurate control over the pulse heating current can be achieved, and the stability of the pulse heating current is improved.

Description

technical field [0001] The invention belongs to the field of power battery heating, and in particular relates to a pulse heating current control method and system for a power battery and an electric vehicle. Background technique [0002] The power battery of electric vehicles will have problems such as voltage drop and discharge capacity reduction under low temperature conditions, so it is necessary to quickly heat the power battery to an appropriate temperature. The motor controller can control the pulse current flowing through the power battery to heat the power battery by controlling the on-off of six power switches (that is, six IGBTs) of the three-phase bridge arm. This method is more efficient and less expensive than traditional external heat conduction heating. [0003] However, the current common heating control scheme has the following problems: the output torque of the motor rotor is caused by the control error during the heating process, which will cause gear wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/27
CPCB60L58/27B60L2240/545Y02T10/70
Inventor 邓承浩胡建军向宇陈健彭钱磊
Owner 深蓝汽车南京研究院有限公司
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