Electric vehicle motor torque estimation method and system and vehicle

A motor torque, electric vehicle technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of inaccurate calculation, inaccurate torque value, and inaccurate calculation of electrical power, etc., to achieve The effect of precise estimates and precise estimates

Active Publication Date: 2021-09-28
深蓝汽车科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Domestic torque monitoring mainly consists of two types, one is to reversely calculate the torque through the vehicle power, and the other is to directly calculate the output torque of the motor through the motor parameters, because the power of the electrical appliance cannot be accurately calculated, and the voltage of the power battery is required and current conditions, multi-platform cooperation is required, resulting in inaccurate calculations
The second is to obtain the torque of the motor through a formula, but this formula is an idealized formula, and the parameters change with the use of the motor, temperature, etc., resulting in inaccurate real-time estimated torque values, thus affecting the judgment of the vehicle driving condition

Method used

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  • Electric vehicle motor torque estimation method and system and vehicle
  • Electric vehicle motor torque estimation method and system and vehicle
  • Electric vehicle motor torque estimation method and system and vehicle

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] see Figure 1 to Figure 5 As shown, this embodiment discloses a method for estimating electric vehicle motor torque, comprising the following steps:

[0031] Extract the d-axis flux change value Δψ of the motor at the current moment from the flux linkage of the d-axis d , due to Δψ f =Δψ d , the Δψ f Substitute into the formula Te=Δψ f *K+Te 0 , which is to estimate the torque value Te at the current moment;

[0032] Among them, the curve function Te=Δψ f *K+Te 0 It is obtained by connecting the torque sensor and the flux linkage measuring instrument on the bench, obtaining different flux linkages and their corresponding torques and fitting them, Te is the torque value at the current moment; Δψ f is the change value of the permanent magnet flux linkage of the motor; Te 0 is the execution torque; K is the coefficient value ob...

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Abstract

The invention discloses an electric vehicle motor torque estimation method and system and a vehicle. The method comprises the following steps of extracting a motor d-axis flux linkage change value deltapsid at the current moment from a d-axis flux linkage, and because deltapsif=deltapsid, substituting deltapsif into a formula Te=deltapsif*K+Te0, namely estimating a torque value Te at the current moment. The curve function Te=deltapsif*K+Te0 is obtained by connecting a torque sensor and a flux linkage measuring instrument on a rack, acquiring different flux linkages and torques corresponding to the flux linkages and fitting the flux linkages and the torques, and Te is a torque value at the current moment; deltapsif is a permanent magnet flux linkage change value of the motor; Te0 is an execution torque; and K is a coefficient value obtained by fitting. The method for estimating the motor torque of the electric vehicle can estimate the motor torque in real time, and the estimation result is more accurate.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method and system for estimating motor torque of an electric vehicle, and a vehicle. Background technique [0002] With the development of electric vehicles, more and more people pay attention to their safety. The high safety of a car is the premise of all driving, and it is also an indispensable condition for future automatic driving. A high-safety car has a strong Market competitiveness, and one of the essential conditions for improving vehicle safety is to know the real torque value currently output by the electric vehicle, and then compare it with the required execution torque to determine whether the vehicle is running normally. As the public pays more and more attention to the safety performance of electric vehicles, the research on the estimation algorithm of electric vehicle drive motor torque is imperative; [0003] Domestic torque monitoring mainly consists of two typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/20
CPCH02P21/20Y02T10/72
Inventor 向阳陈健刘立王志斌陈曦蒋飞
Owner 深蓝汽车科技有限公司
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