Controller circuit, sampling method and control method of electric power steering system, and thereof

An electric power steering and controller technology, which is used in motor control, single motor speed/torque control, electric steering mechanism, etc., can solve problems such as inaccurate diagnosis of field effect transistors

Pending Publication Date: 2021-04-13
BOSCH HUAYU STEERING SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the diagnosis of the field effect tube of the three-phase bridge module in the electric power steering system controller circuit in the prior art is not accurate enough, and to provide an easy and convenient way to perform three-phase bridge Controller circuit and sampling and control method of electric power steering system for electrical fault diagnosis

Method used

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  • Controller circuit, sampling method and control method of electric power steering system, and thereof
  • Controller circuit, sampling method and control method of electric power steering system, and thereof
  • Controller circuit, sampling method and control method of electric power steering system, and thereof

Examples

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Effect test

Embodiment 1

[0115] like figure 1 As shown, this embodiment provides a controller circuit for an electric power steering system, including a three-phase motor 18, a microcontroller 1, a three-phase bridge module 5, a three-phase bridge driver chip 9 and a phase voltage state feedback of the three-phase motor circuit 14. The three-phase motor 18 includes a U-phase terminal 1801 , a V-phase terminal 1802 and a W-phase terminal 1803 . The microcontroller 1 includes at least three analog-to-digital conversion voltage acquisition terminals, which are U-phase analog-to-digital conversion voltage acquisition terminal AD1, V-phase analog-to-digital conversion voltage acquisition terminal AD2 and W-phase analog-to-digital conversion voltage acquisition terminal AD3. The three-phase bridge module 5 includes a U-phase upper bridge FET Q1, a U-phase lower bridge FET Q4, a V-phase upper bridge FET Q2, a V-phase lower bridge FET Q5, and a W-phase upper bridge FET Q3. And W phase lower bridge field eff...

Embodiment 2

[0140] This embodiment is a further improvement on the basis of Embodiment 1, as figure 2 As shown, the controller circuit of the electric power steering system provided in this embodiment further includes a three-phase separation module 6 and a motor freewheeling circuit 15 . The three-phase separation module 6 is connected in series between the three-phase motor 18 and the three-phase bridge module 5, and the three-phase separation module 6 is used to cut off the connection between the three-phase motor 18 and the three-phase bridge module 5 when the steering system controller fails. connect.

[0141] In this embodiment, the three-phase separation module 6 includes a U-phase separation field effect transistor Q7 , a V-phase separation field effect transistor Q8 and a W-phase separation field effect transistor Q9 . The motor freewheeling circuit 15 includes a U-phase diode D1, a V-phase diode D2 and a W-phase diode D3; the anodes of the U-phase diode D1, the V-phase diode D...

Embodiment 3

[0146] This embodiment provides a method for sampling three-phase currents of a controller circuit of an electric power steering system. Wherein, the controller circuit includes a three-phase motor, a microcontroller, a three-phase bridge module, a three-phase phase current sampling circuit module and a three-phase bridge driver chip. The microcontroller is used to generate the PWM control signal and output it to the three-phase bridge driver chip. The three-phase bridge driver chip is used to control the opening or closing of each field effect transistor in the three-phase bridge module according to the PWM control signal.

[0147] During specific implementation, the sampling method can be implemented based on Embodiment 1 or Embodiment 2 or the controller circuit of the existing electric power steering system.

[0148] In this embodiment, the sampling method includes the following steps:

[0149] The three-phase phase current sampling circuit module collects phase voltage ...

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Abstract

The invention discloses a controller circuit,a sampling method and a control method of an electric power steering system. The circuit comprises a three-phase motor, a microcontroller, a three-phase bridge module and a three-phase motor phase voltage state feedback circuit. The three-phase motor phase voltage state feedback circuit comprises three voltage division circuits and three pull-up circuits. The microcontroller is used for controlling the U-phase upper bridge field-effect tube, the U-phase lower bridge field-effect tube, the V-phase upper bridge field-effect tube, the V-phase lower bridge field-effect tube, the W-phase upper bridge field-effect tube and / or the W-phase lower bridge field-effect tube to be opened or closed, and carrying out power-on fault diagnosis on the U-phase upper bridge field-effect transistor, the U-phase lower bridge field-effect transistor, the V-phase upper bridge field-effect transistor, the V-phase lower bridge field-effect transistor, the W-phase upper bridge field-effect transistor and the W-phase lower bridge field-effect transistor based on the voltage acquired by the analog-to-digital conversion voltage acquisition end. According to the invention, accurate diagnosis of each field effect transistor in the three-phase bridge module is realized, and the diagnosis coverage rate of the field effect transistor is improved.

Description

technical field [0001] The invention relates to the technical field of control of an electric power steering system, in particular to a controller circuit and a sampling and control method of the electric power steering system. Background technique [0002] The electric power steering system has the advantages of small size, light weight, simple structure, high efficiency, energy saving and environmental protection, flexible control methods, etc., and has become an indispensable part of the car. Electric power steering system controller circuit design and its control method are the core of the electric power steering system. Suppliers of electric power steering systems or controllers at home and abroad have their own controller circuit design and control methods. The main core functions are Functional safety design of power-assisted motor control and steering system. [0003] Since the electric power steering system controller has relatively high safety performance requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/0463H02P6/08B62D5/0487B62D5/046H02H7/122H02P29/024H02P29/0243
Inventor 龚德林查义炜吴夏青景彩云张彤蕾
Owner BOSCH HUAYU STEERING SYST CO LTD
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