KR20170005910A - Operation control circuit for motor of electronic power steering - Google Patents
Operation control circuit for motor of electronic power steering Download PDFInfo
- Publication number
- KR20170005910A KR20170005910A KR1020150095673A KR20150095673A KR20170005910A KR 20170005910 A KR20170005910 A KR 20170005910A KR 1020150095673 A KR1020150095673 A KR 1020150095673A KR 20150095673 A KR20150095673 A KR 20150095673A KR 20170005910 A KR20170005910 A KR 20170005910A
- Authority
- KR
- South Korea
- Prior art keywords
- switch
- relay
- switches
- motor
- voltage difference
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
- B60W2050/021—Means for detecting failure or malfunction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The present invention relates to a motor drive control circuit of an electric power steering apparatus, and more particularly, to a motor drive control circuit of a motor-driven steering apparatus, comprising: a relay connected in series with a battery and controlling a power supply provided from a battery; At least one pair of switches connected between the battery and the motor, the pair of switches being arranged in pairs relative to each phase of the motor; A switch monitoring unit for monitoring a voltage difference between both ends of at least one pair of switches; A relay monitoring unit monitoring a voltage difference between both ends of the relay; And a power control part for determining that at least one of the switches is abnormal if a voltage difference between both ends of at least one of the switches and a voltage difference between both ends of the relay are out of a predetermined range. As a result, the state of the shoot through state of the switch can be accurately determined. Therefore, when the motor is not in the shoot through state, it is possible to prevent the driver from stopping the drive, thereby minimizing the inconvenience of the driver.
Description
[0001] The present invention relates to a motor drive control circuit of an electric steering system, and more particularly, to a motor drive control circuit for an electric steering system, which detects three pairs of switches connected to respective phases of a motor and a voltage flowing through the relays, The present invention relates to a motor drive control circuit for an electric steering system.
Generally, a vehicle is provided with an electronic power steering (EPS) to easily steer the steering wheel, and EPS assists the steering force of the driver by using the rotational force of the motor.
This EPS controls driving of the motor according to the torque and the steering angle sensed when the steering wheel rotates, and the motor receives power from the battery.
The motor can be configured as a three-phase motor with three phases of U, V, W phases connected to a common molded connection point. As the motor has three phases, a pair of switches is connected to each phase of the motor to intermittently supply power supplied from the battery. That is, three-phase motors are connected to three pairs of switches, and three pairs of switches are alternately turned on and off so that the motors can be driven.
Of these three pairs of switches, three switches connected to the positive electrode of the battery are called upper switches, and three switches connected to the negative electrode of the battery are called lower switches. One upper switch and one lower switch are turned on at the same time for driving the motor, and the upper switch and the lower switch must be connected to each other on a different phase. If the upper switch connected to one phase and the lower switch are turned on at the same time, a short circuit may occur in the motor and the circuit, and the motor and the circuit may be damaged.
On the other hand, when one of the upper switch and the lower switch is short-circuited, when the upper switch and the lower switch are alternately turned on, a shoot-through occurs in which the upper switch and the lower switch connected to one phase are turned on at the same time . Accordingly, it is necessary to accurately detect a short between the upper switch and the lower switch.
The present invention proposes a motor drive control circuit of an electric steering system which can determine whether or not three switches connected to respective phases of a motor are shot-off.
The object of the present invention can be achieved by a battery charger comprising: a relay connected in series with a battery and controlling a power supply provided from the battery; At least a pair of switches connected between the battery and the motor, the pair of switches being arranged in pairs relative to each phase of the motor; A switch monitoring unit monitoring a voltage difference between both ends of each of the at least one pair of switches; A relay monitoring unit monitoring a voltage difference between both ends of the relay; And a power controller for determining that the at least one switch is abnormal when a voltage difference between both ends of at least one of the switches and a voltage difference between both ends of the relay are out of a predetermined range, Can be achieved by a motor drive control circuit of the apparatus.
According to the present invention, the voltage difference between the both ends of the upper switch and the lower switch can be used as a primary difference, and the voltage difference between the ends of the relay can be used as a secondary to accurately determine the state of a shoot through. That is, it is possible to more accurately determine the shoot through state by double checking. Therefore, it is possible to prevent the driver from stopping the motor despite the non-shoot through state, thereby minimizing the driver's inconvenience. In addition, since the shoot through can be accurately determined, it is possible to reduce the risk of accidents by stopping the drive of the motor in the shoot through state.
1 is a block diagram of a motor drive control circuit of an electric power steering apparatus according to the present invention,
FIG. 2 is a flowchart showing a process of judging and controlling a shoot through of the upper switch and the lower switch in the motor drive control circuit of FIG. 1;
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."
1 is a motor drive control circuit of an electric steering system according to the present invention.
The motor drive control circuit can detect a short-circuit between each switch connected to the
The
This motor drive control circuit includes three pairs of
Three pairs of
One end of each pair of switches is connected to the cathode side of the
The
The
The
The
When the switch is on, the voltage difference between both ends of the switch is detected to be close to zero. When the switch is off, a voltage difference across the switch is detected adjacent to the voltage provided by the battery. On the other hand, when the switch is in the short state, since the amount of the current flowing through the switch increases, the voltage across the switch increases and the voltage difference across the switch increases. Therefore, the voltage difference between both ends detected when the switch is in the short state is much smaller than when the switch is in the off state, but a larger value is detected than when the switch is in the on state.
In order to detect the short state of such a switch, the
The
The
If the
On the other hand, sometimes the AC component noise occurs at the time of on-off due to the characteristics of the FET, and the
In the present invention, the voltage difference across the
The
Since the
Accordingly, the
The relay threshold voltage value used in the
[Equation 1]
V reth = (I max * R relay ) + V tol
Here, I max represents a maximum voltage flowing through the
The
The power
In addition, the
The power
The
A process of judging and controlling the shoot through of the upper switch and the lower switch in the motor drive control circuit of the electric type steering apparatus having such a configuration will be described with reference to FIG.
When the vehicle is started, the power
When the vehicle is started as described above, the
The
Then, the power
If the voltage difference across the
As described above, according to the motor drive control circuit of the electric power steering apparatus according to the present invention, the first to third
The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
5: Motor 10: Battery
21: first upper switch 22: second upper switch
23: third upper switch 31: first lower switch
32: second lower switch 33: third lower switch
35: Switch monitoring section 40: Relay
45: Relay monitoring unit 50: Power control unit
Claims (6)
At least a pair of switches connected between the battery and the motor, the pair of switches being arranged in pairs relative to each phase of the motor;
A switch monitoring unit monitoring a voltage difference between both ends of each of the at least one pair of switches;
A relay monitoring unit monitoring a voltage difference between both ends of the relay; And
And a power controller for determining that the at least one switch is abnormal if a voltage difference between both ends of at least one switch among the switches and a voltage difference between both ends of the relay are out of a predetermined range, Of the motor drive control circuit.
Wherein the power supply control unit determines that the at least one switch is abnormal only when at least one of the switches out of the preset range is in the on state.
Wherein the power supply control unit determines that a shoot through occurs when a voltage difference between both ends of at least one of the switches exceeds a preset switch threshold voltage value and a voltage difference between both ends of the relay exceeds a preset relay threshold voltage value And the motor drive control circuit of the electric power steering apparatus.
Wherein the switch threshold voltage value is formed between a voltage value across the switch when each switch is in an ON state and a voltage across the switch when each switch is in an OFF state. Control circuit.
Wherein the relay threshold voltage value is calculated by adding a margin voltage to a value obtained by multiplying a maximum current value flowing through the relay by a resistance value of an ON state of the relay.
Wherein the power control unit turns off the relay to shut off power supplied to the motor from the battery when it is determined that the shoot through has occurred.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150095673A KR20170005910A (en) | 2015-07-06 | 2015-07-06 | Operation control circuit for motor of electronic power steering |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150095673A KR20170005910A (en) | 2015-07-06 | 2015-07-06 | Operation control circuit for motor of electronic power steering |
Publications (1)
Publication Number | Publication Date |
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KR20170005910A true KR20170005910A (en) | 2017-01-17 |
Family
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Family Applications (1)
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KR1020150095673A KR20170005910A (en) | 2015-07-06 | 2015-07-06 | Operation control circuit for motor of electronic power steering |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019117555A1 (en) * | 2017-12-11 | 2019-06-20 | 주식회사 엘지화학 | Short-circuit prevention device and method |
KR20200059858A (en) * | 2018-11-22 | 2020-05-29 | 현대모비스 주식회사 | Apparatus and method for determining relay state of motor driven power steering system |
-
2015
- 2015-07-06 KR KR1020150095673A patent/KR20170005910A/en unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019117555A1 (en) * | 2017-12-11 | 2019-06-20 | 주식회사 엘지화학 | Short-circuit prevention device and method |
CN110741521A (en) * | 2017-12-11 | 2020-01-31 | 株式会社Lg化学 | Apparatus and method for preventing short circuit |
CN110741521B (en) * | 2017-12-11 | 2021-12-21 | 株式会社Lg化学 | Apparatus and method for preventing short circuit |
US11269018B2 (en) | 2017-12-11 | 2022-03-08 | Lg Energy Solution, Ltd. | Apparatus and method for preventing short circuit |
KR20200059858A (en) * | 2018-11-22 | 2020-05-29 | 현대모비스 주식회사 | Apparatus and method for determining relay state of motor driven power steering system |
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