EPS motor position detection system and method based on TMR elements
A technology of motor position and detection system, applied in electrical components, electromechanical devices, electric components, etc., can solve the problems of motor position safety and insufficient reliability detection, and achieve the effect of preventing failure to work, accurate detection, and reliable motor position
Pending Publication Date: 2020-06-16
中国公路车辆机械有限公司
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Problems solved by technology
As an important parameter of the electric power steering system, the position of the motor is very important for the control of the motor. The safety and reliability detection of the motor position in the prior art is still not enough
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[0016] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.
[0017] Such as figure 1 As shown, a magnetic ring is set on the rotor of the motor. The magnetic ring is circular, and the setting position is coaxial with the motor rotor. The magnetic ring is made of magnets. Under the magnetic field, it is used to detect the magnetic field signal generated by the magnetic ring when the motor rotates. The output end of the TMR chip is connected to the control unit ECU of the EPS, and the control unit ECU judges the position of the motor rotor according to the output electrical signal of the TMR chip. The magnet is installed on the motor rotor. The magnetic field generated by the magnet is detected by the TMR element, and converted into an electrical signal and output. The ECU judges the position of the motor rotor by detecting the electrical signal.
[0...
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The invention discloses an EPS motor position detection system and method based on TMR elements. The system comprises a TMR chip and a magnetic ring, wherein the magnetic ring is arranged on a motor rotor, the TMR chip is arranged opposite to the magnetic ring and used for detecting a magnetic field signal generated by the magnetic ring when the motor rotates, the output end of the TMR chip is connected with a control unit ECU of an EPS, and the control unit ECU judges the position of the motor rotor according to an output electric signal of the TMR chip. According to the invention, the TMR element chip is adopted to detect the position of the motor, so that the detection is more accurate; a plurality of TMR elements are arranged for averaging, so that the detected motor position is more reliable, faults can be detected, and the data of the faulted TMR elements is discarded and the motor position is calculated according to the data of normal TMR elements; and a safety motor position threshold value is set so as to prevent the defect that the EPS cannot work due to the fact that the EPS cannot obtain the position of the motor.
Description
technical field [0001] The invention relates to the field of electric power steering, in particular to a position redundant detection method for an EPS motor based on a TMR element. Background technique [0002] As an auxiliary electric component of the vehicle, the electric power steering assists the normal use of the vehicle, reduces the driver's force during the steering process, and can realize the steering operation with less force. The realization of electric power steering needs to collect some data including but not limited to steering wheel angle, motor position, etc. As an important parameter of the electric power steering system, the position of the motor is crucial to the control of the motor. The safety and reliability detection of the motor position in the prior art is still not enough. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a redundant motor position detection syst...
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IPC IPC(8): H02P6/16H02K11/215
CPCH02P6/16H02K11/215
Inventor 吴纪刚胡选儒李骏原彦军赵帆向坤
Owner 中国公路车辆机械有限公司