CN201256376Y - Motor driver used for automobile electric power assisted steering system - Google Patents
Motor driver used for automobile electric power assisted steering system Download PDFInfo
- Publication number
- CN201256376Y CN201256376Y CNU2008201869885U CN200820186988U CN201256376Y CN 201256376 Y CN201256376 Y CN 201256376Y CN U2008201869885 U CNU2008201869885 U CN U2008201869885U CN 200820186988 U CN200820186988 U CN 200820186988U CN 201256376 Y CN201256376 Y CN 201256376Y
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Abstract
The utility model provides a motor driver of an automobile electric power-assisted steering system, which mainly comprises a power-assisted motor H-bridge driving circuit module, a driver failure detecting and protecting module and a power-assisted motor absorbing current detecting module, wherein the power-assisted H-bridge driving circuit module completes the driving of the motor, the driver failure detecting and protecting module is connected with the power-assisted motor H-bridge driving circuit module for detecting the state of the module and protecting hardware of the power-assisted motor H-bridge driving circuit module when failures generate, and the power-assisted motor absorbing current detecting module is connected with the power-assisted motor H-bridge driving circuit module for completing the detecting of the absorbing current of the power-assisted motor. The stable motor driving circuit designed by the utility model adopts the failure detecting and protecting circuit, which greatly improves the reliability of the system, simultaneously designs a motor absorbing current collecting circuit, which can accurately collect the absorbing current of the motor and realize the accurate control of the motor.
Description
Technical field
The utility model relates to the motor-driven technical field, relates in particular to a kind of Driving technique that is used for the automobile electric booster steering system assist motor.
Background technology
In recent years, automobile electric booster steering system is applied on some automobiles.Electric boosting steering system generally is made of electronic control unit (ECU), torque sensor, assist motor, reducing gear, steering column and mechanical driving device.Its operation principle is, when motor turning, torque sensor detects turning to of steering wheel and torque, and signal is passed to electronic control unit, electronic control unit is according to the moment that turns to and export of above signal control motor, thus the realization electric power steering.Compare with traditional hydraulic power-assisted steering, do not have the hydraulic booster pump in the electric boosting steering system, and system does not work when not turning to, significant to vehicle energy saving, be the developing direction of servo steering system.Direct current machine is the critical component of electric boosting steering system, and reasonably motor drive mode is the important assurance that motor is stable, the electric boosting steering system service behaviour is good.
The utility model content
The technical problem that the utility model solved provides a kind of motor driver that is used for automobile electric booster steering system, and it has current detecting and fault detect and defencive function, and thermal diffusivity is good, and system works is stable.
The technical solution of the utility model is: a kind of motor driver that is used for automobile electric booster steering system mainly comprises assist motor H bridge drive circuit module, driver malfunction diagnosis and protection module and assist motor absorption current detection module; Wherein, assist motor H bridge drive circuit module is finished the driving of motor; The driver malfunction diagnosis links to each other with assist motor H bridge drive circuit module with protection module, the state of detection module, and when producing fault, finish hardware protection to assist motor H bridge drive circuit module; Assist motor absorption current detection module links to each other with assist motor H bridge drive circuit module, finishes the detection to the assist motor absorption current.
The beneficial effects of the utility model are: the stable motor-drive circuit of design; adopt failure diagnosis and protective circuit, improve the reliability of system greatly, designed motor absorption current Acquisition Circuit simultaneously; can accurately gather the motor absorption current, realize accurate Electric Machine Control.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is an assist motor H bridge drive circuit schematic diagram of the present utility model.
Fig. 3 is driver malfunction diagnosis of the present utility model and protective circuit principle.
Fig. 4 is an assist motor absorption current testing circuit schematic diagram of the present utility model.
Embodiment
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4; a kind of motor driver that is used for automobile electric booster steering system is characterized in that comprising by assist motor H bridge drive circuit module 1 and the driver malfunction diagnosis and the protection module 2 and assist motor absorption current detection module 3 that are attached thereto.
Describe the composition and the function thereof of main circuit in detail below in conjunction with accompanying drawing.
As Fig. 1, theory diagram of the present utility model, motor H bridge drive circuit module 1 is finished the driving of motor.The driver malfunction diagnosis links to each other with motor H bridge drive circuit module 1 with assist motor absorption current detection module 3 with protection module 2, finishes failure diagnosis, protection and current sense function.
When the motor operate as normal, motor H bridge drive circuit module 1 is mainly finished the driving of motor, it is characterized in that the direction of motor rotation signal 1 that sends of ECU and direction signal 2 is connected to two BTS7960B respectively by resistance R 1 and R5 IN input, the control assist motor rotates to different directions, promptly export the moment of different directions, thereby realize the power-assisted of different directions.The electric moter voltage control signal (pwm signal) of ECU output is connected to the INH input of two BTS7960B simultaneously by resistance R 3 and R6, the terminal voltage of the duty cycle adjustment motor by regulating pwm signal, thereby realize that capacitor C 1 and capacitor C 2 play the decoupling effect to the control of output power-assisted size.Assist motor absorption current detection module of the present utility model 3 by precision resistance R6 from motor from the high-end collection assist motor of bridge wall absorption current signal, this signal is passed through follower IC3, and by resistance R 7 and capacitor C 4 filtering, thereby obtain precise and stable assist motor absorption current signal.This current signal is sent into electronic control unit, realize closed-loop control motor.Failure diagnosis of the present utility model and protection module 2 are output as input with the state of assist motor H bridge drive circuit module 1, and driver can be by resistance R 5 to capacitor C 3 chargings under the state of operate as normal, and promptly the A point is a low level, not conducting of field effect transistor Q1.
When this driver breaks down; failure diagnosis and protection module 2 work; assist motor H bridge drive circuit module 1 output malfunction; charge to capacitor C 3 by resistance R 5; when A point voltage during greater than the conducting voltage of field effect transistor Q1; field effect transistor Q1 conducting; it is low making the motor output torque control signal of motor H bridge drive circuit module 1; be that motor output torque is zero; after fault is eliminated, capacitor C 3 discharges, the A point voltage is less than the conducting voltage of field effect transistor Q1; field effect transistor Q1 by, system automatically restores to normal operating conditions.Diode D1 is used to protect field effect transistor Q1.
Claims (4)
1, a kind of motor driver that is used for automobile electric booster steering system is characterized in that: mainly comprise assist motor H bridge drive circuit module (1), driver malfunction diagnosis and protection module (2) and assist motor absorption current detection module (3); Wherein, assist motor H bridge drive circuit module (1) is finished the driving of motor; Driver malfunction diagnosis links to each other with assist motor H bridge drive circuit module (1) with protection module (2), the state of detection module (1), and when the generation fault, finish hardware protection to assist motor H bridge drive circuit module (1); Assist motor absorption current detection module (3) links to each other with assist motor H bridge drive circuit module (1), finishes the detection to the assist motor absorption current.
2, motor driver according to claim 1, it is characterized in that: in described assist motor H bridge drive circuit module (1), two BTS7960B (IC1, IC2) constitute a H bridge motor-drive circuit, the anode of diode (D1) links to each other with the 12V power supply, negative terminal links to each other with 7 pin of two BTS7960B (IC1, IC2), the anode of electric capacity (C1) and electric capacity (C2) links to each other with the negative terminal of diode (D1), and electric capacity (C1) links to each other with ground with the negative terminal of electric capacity (C2); 2 pin of BTS7960B (IC1) link to each other with resistance (R1); 2 pin of BTS7960B (IC2) link to each other with resistance (R3); 3 pin of two BTS7960B (IC1, IC2) link to each other with resistance (R4) with resistance (R2) respectively; One end of the resistance (R5) in diagnosis of 5 pin of two BTS7960B (IC1, IC2) and driver malfunction and the protection module (2) links to each other, and 6 pin of two BTS7960B (IC1, IC2) link to each other with the in-phase end of the middle operational amplifier (IC3) of assist motor absorption current detection module (3); 4 pin of BTS7960B (IC1) link to each other with 8 pin, and link to each other with an input of motor, and 4 pin of BTS7960B (IC2) link to each other with 8 pin, and link to each other with another input of motor; The 1 pin ground connection of two BTS7960B (IC1, IC2).
3, motor driver according to claim 2, it is characterized in that: in driver malfunction diagnosis and the protection module (2), one end of resistance (R5) links to each other with 5 pin of two BTS7960B (IC1, IC2), the other end extremely links to each other with the g of electric capacity (C3) with field effect transistor (Q1), and the other end of electric capacity (C3) links to each other with ground; The d utmost point of field effect transistor (Q1) links to each other with R4 with the middle resistance R 2 of assist motor H bridge drive circuit module (1), is connected the positive ending grounding of the s utmost point of field effect transistor (Q1) and diode (D2) with the negative terminal of diode (D2) simultaneously.
4, motor driver according to claim 1, it is characterized in that: in the assist motor absorption current detection module (3), one end of precision resistance (R6) links to each other with 6 pin in the assist motor H bridge drive circuit module (1), link to each other with the in-phase end of operational amplifier (IC3) simultaneously, the other end of resistance (R6) links to each other with ground, the end of oppisite phase of operational amplifier (IC3) links to each other with output, form voltage follower, the output of operational amplifier (IC3) links to each other with an end of resistance (R7), the other end of resistance (R7) is imported AD converter with signal, and link to each other the other end ground connection of electric capacity (C4) with an end of electric capacity (C4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201869885U CN201256376Y (en) | 2008-09-12 | 2008-09-12 | Motor driver used for automobile electric power assisted steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201869885U CN201256376Y (en) | 2008-09-12 | 2008-09-12 | Motor driver used for automobile electric power assisted steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256376Y true CN201256376Y (en) | 2009-06-10 |
Family
ID=40739704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201869885U Expired - Fee Related CN201256376Y (en) | 2008-09-12 | 2008-09-12 | Motor driver used for automobile electric power assisted steering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256376Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734135A (en) * | 2009-12-29 | 2010-06-16 | 东莞市精航达电动转向***有限公司 | Electric power-assisted steering control method and control device for vehicles |
| WO2021135738A1 (en) * | 2019-12-31 | 2021-07-08 | 比亚迪股份有限公司 | Motor control system and motor control apparatus |
-
2008
- 2008-09-12 CN CNU2008201869885U patent/CN201256376Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734135A (en) * | 2009-12-29 | 2010-06-16 | 东莞市精航达电动转向***有限公司 | Electric power-assisted steering control method and control device for vehicles |
| WO2021135738A1 (en) * | 2019-12-31 | 2021-07-08 | 比亚迪股份有限公司 | Motor control system and motor control apparatus |
| US11811350B2 (en) | 2019-12-31 | 2023-11-07 | Byd Company Limited | Motor control system and motor control apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20110912 |