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Angle decoding method of rotary transformer in electric power steering system

A technology of electric power steering and rotary transformer, which is applied in the direction of electric steering mechanism, power steering mechanism, electronic commutator, etc., and can solve the problem of high price of special decoding chip

Active Publication Date: 2017-05-31
上海拿森汽车电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many companies have launched special decoding chips, such as: AD2S80, AD2S80A, AD2S1200 series developed by ANALOG DEVICES and Au6802, Au6802N1, Au6803 series developed by Tamagawa Company, and special decoding chips are generally very expensive

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  • Angle decoding method of rotary transformer in electric power steering system
  • Angle decoding method of rotary transformer in electric power steering system
  • Angle decoding method of rotary transformer in electric power steering system

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The rotary transformer of the present invention is composed of an excitation winding input, a sine winding output and a cosine winding output. The usual configuration is that the primary winding is on the rotor and the two secondary windings are on the stator, as in figure 1 shown.

[0018] Assuming that the absolute angle of the rotor is θ, the voltage of the primary winding, that is, the excitation voltage is: V r =V p sin(ωt)

[0019] where V r Signal amplitude, ω is excitation angular frequency. Then the functional relationship between the output voltage and the input voltage is:

[0020] V a =V s sin(ωt)cos(θ) (2.1)

[0021] V b =V s sin(ωt)sin(θ) (2.2)

[0022] The primary winding is excited with an AC reference, and the two stator windings are mechanically misaligned by 90°, so the magnitude of the coupling on the stator sec...

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Abstract

The invention discloses an angle decoding method of a rotary transformer in an electric power steering system. A primary winding and two secondary windings are arranged on the rotary transformer; and the two secondary windings are mechanically staggered at 90 degrees. The angle decoding method comprises the following steps of (S1) obtaining cosine analogue voltage signals Va and Vb of the primary windings by using an AD sampling module, and transforming and outputting two digital voltage signals; (S2) carrying out inverse tangent operation on transformed cosine digital voltage signals by using an FPGA hardware resource on the basis of a CORDIC algorithm and decoding to obtain a position angle of a rotary transformer rotor; and (S3) outputting the position angle obtained through decoding to an EPS controller as an angle feedback input signal. By adopting discrete devices of the FPGA, an AD conversion chip and the like, the analogue signals output by the rotary transformer are processed on the basis of the CORDIC algorithm to achieve angle decoding of a motor.

Description

technical field [0001] The invention relates to an automobile electronic technology, in particular to an angle decoding method of a rotary transformer in an electric power steering system. Background technique [0002] The electric power steering system is composed of a steering column, a reduction mechanism, a rack and pinion, a power assist motor, a sensor, and an ECU control unit. The torque sensor is connected in the middle of the steering shaft through a torsion bar. When the car is turning, the torque sensor starts to work and converts the relative rotation angle into torque electrical signals, which are transmitted to the electronic control unit ECU through the data bus. The electronic control unit ECU sends action instructions to the motor according to the steering wheel's rotational torque and vehicle speed and other data signals; the motor obtains angle information from the resolver to determine the rotation direction of the motor and the magnitude of the assist c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16B62D5/04
CPCB62D5/0463H02P6/16
Inventor 苗会彬
Owner 上海拿森汽车电子有限公司
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