KR20120061437A - Fault finding apparatus relay switch for mdps - Google Patents

Fault finding apparatus relay switch for mdps Download PDF

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Publication number
KR20120061437A
KR20120061437A KR1020100122758A KR20100122758A KR20120061437A KR 20120061437 A KR20120061437 A KR 20120061437A KR 1020100122758 A KR1020100122758 A KR 1020100122758A KR 20100122758 A KR20100122758 A KR 20100122758A KR 20120061437 A KR20120061437 A KR 20120061437A
Authority
KR
South Korea
Prior art keywords
capacitor
relay switch
relay
mdps
failure
Prior art date
Application number
KR1020100122758A
Other languages
Korean (ko)
Inventor
황준섭
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020100122758A priority Critical patent/KR20120061437A/en
Publication of KR20120061437A publication Critical patent/KR20120061437A/en

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Classifications

    • 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
    • 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
    • B62D5/0409—Electric motor acting on the steering column
    • B62D5/0412—Electric motor acting on the steering column the axes of motor and steering column being parallel
    • 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
    • B62D5/0484—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 for reaction to failures, e.g. limp home
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • 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

Abstract

PURPOSE: A fault detection apparatus for the relay of an MDPS is provided to detect the short-circuit of a relay switch generated in an ignition cycle by using a MCU(Micro Controller Unit). CONSTITUTION: A fault detection apparatus(50) for the relay of a MDPS comprises a relay switch(40, S1), first and second capacitors(C1, C2), a transistor(52), and a MCU(Micro Controller Unit)(54). The relay switch is installed in a MDPS including an ECU. The relay switch controls the high current of a battery for allowing the high current to the inverter of a motor. First and second capacitors are charged with electric power in order to supply the high current to the inverter. The both ends of the transistor are connected to the inverter and a ground terminal and discharges the first and second capacitors according to control signals. The MCU operates discharging in case of the relay switch turned off and detects the fault of the relay switch.

Description

Relay failure detection device of MDPS {FAULT FINDING APPARATUS RELAY SWITCH FOR MDPS}

The present invention relates to a relay failure detection device of the MDPS, and more particularly, by detecting the relay stuck or burned out in the ignition cycle before the relay operation to detect the possibility of fire and inability to operate the ECU in advance to reduce the risk of safety accidents The present invention relates to an MDPS relay failure detection device that can be removed and facilitated vehicle management.

Generally, a power steering device is applied to a vehicle to ensure steering stability. The power steering device has been widely used in a vehicle, such as a hydraulic power steering device (HPS) using hydraulic pressure. Recently, the installation of environmentally friendly Motor Power Steering (MDPS), which assists the driver's steering power by using the rotational power of the motor, has been increasing.

The electric power steering device drives a motor in an electronic control unit (ECU) according to the driving conditions of the vehicle detected by a vehicle speed sensor and a torque sensor, thereby providing a light and comfortable steering feeling at low speeds, and at high speeds. In addition to heavy and safe steering, it provides good directional stability, and provides emergency steering to the driver by enabling rapid steering in emergency situations.

1 is a block diagram illustrating an electric steering system according to a conventional embodiment.

Referring to this, the conventional electric steering apparatus 2 (MDSP) is a torque sensor 10 and a steering angle sensor 6 for detecting torque and steering angle according to the rotation of a torsion bar (not shown) installed in the handwheel 4, The ECU 12 which calculates the driving assistance force of the motor 14 according to the sensing signal sensed by this torque sensor 10 and the steering angle sensor 6 is provided. The motor 14 is a permanent magnet type three-phase motor, and includes three Hall sensors for sensing the absolute angle of the rotor and an encoder for sensing the incremental angle. That is, the motor 14 is provided with the motor position sensor 16.

In particular, the steering angle measured by the steering angle sensor 6 is used for the restoration control of the vehicle at the medium speed of the vehicle. When an error occurs in this angle, the steering angle and the unrestored shape of the vehicle are generated at a high speed. How to determine the failure of the torque sensor 10 to measure will be very important.

Unexplained reference numeral 4 represents a handwheel, 16 represents a belt, 18 represents a gear, and 20 represents a tie rod.

2 is a circuit diagram showing a power supply circuit of the ECU 12 included in the conventional electric steering apparatus 2.

Referring to this, the ECU 12 controls a large current for driving a motor and receives power for calculation through a battery. At this time, the power supply circuit 30 of the conventional ECU 12 is provided with a first diode 32 for preventing the reverse connection of the battery terminal, the operation mode of the driver 12 of the ECU 12 of the MDPS In this case, the MCU 34 (Micro Controller Unit) configured to turn on the relay switch 40: S1 for detecting the voltages of the first capacitor C1 and the second capacitor C2 to control the large current of the battery.

Here, the first capacitor C1 and the second capacitor C2 are capacitors which charge a power source to supply a large current to an inverter which directly drives a motor. The first capacitor C1 and the second capacitor C2 C2) is generally in the capacity of thousands of microwatts or more.

The power supply circuit of the conventional ECU is a voltage difference between the first capacitor and the second capacitor, the voltage difference between the battery and the capacitor when the relay switch is operated when the first capacitor and the second capacitor are not charged above the appropriate voltage. There was a problem in that the inrush current of several hundred amps (A) is generated by the capacity, and the relay switch can be broken.

Therefore, conventionally, a control function for controlling the turn-on time by detecting the voltages of the first and second capacitors by the MCU so as to prevent inrush current when the relay switch for interrupting a large current is turned on has been developed. When the relay switch is already fixed during the operation of the MCU, the function of controlling the turn-on time by sensing the voltages of the first capacitor and the second capacitor has been a problem.

That is, the MCU should turn off the relay switch at the end of the operation mode. However, if the relay switch is already stuck due to burnout, a fire may occur due to a large current input, and the ECU cannot be checked for malfunction. Had a problem.

The present invention was devised to improve the above-mentioned problem, and it is possible to eliminate the risk of a safety accident by grasping a relay stuck or burned out in an ignition cycle before the relay operation to detect a possibility of a fire and an inability to operate the ECU in advance. It is an object of the present invention to provide a MDPS relay failure detection device that enables easy vehicle management.

Relay failure detection device of the MDPS according to the present invention is configured in the MDPS equipped with an ECU for driving the steering motor by detecting the steering torque of the driver, the relay switch for intermittent to apply a large current of the battery to the inverter of the motor; A first capacitor C1 and a second capacitor C2 for charging power to instantaneously supply a large current to the inverter directly driving the motor; A transistor connected at both ends of the inverter and a ground terminal to discharge charges charged in the first capacitor C1 and the second capacitor C2 by a control signal; When the relay switch is turned off, it comprises a MCU for generating a switching signal to the transistor to perform the discharge process, and determine whether the relay switch is broken.

The MCU of the present invention detects the voltages of the first capacitor C1 and the second capacitor C2 after the discharge of the charge charged in the first capacitor C1 and the second capacitor C2 by switching the transistor. It is characterized by determining whether the relay switch is broken.

The MCU of the present invention is characterized in that it is determined that the relay switch is a failure when the voltage of the first capacitor (C1) and the second capacitor (C2) is equal to the battery voltage, or within ± 5V.

The MCU of the present invention is characterized in that it further comprises a failure warning light to output a failure warning light provided in the cluster when it is determined that the relay switch failure.

The present invention has the advantage that it is possible to prevent a vehicle fire or an inability of the ECU by judging whether or not a failure of the relay switch for cracking a large current to the inverter of the motor in advance, and the safety that can be enjoyed by the addition of inexpensive components. There is an advantage that the convenience is much greater.

1 is a block diagram showing an electric steering system according to a conventional embodiment;
2 is a circuit diagram showing a power supply circuit of an ECU included in a conventional electric steering apparatus;
3 is a circuit diagram showing the configuration of the relay failure detection device of the MDPS according to an embodiment of the present invention,
4 is a diagram illustrating a control signal of a transistor configured in the relay failure detection device of the MDPS according to an embodiment of the present invention.

Hereinafter, a relay failure detection device of MDPS according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

3 is a circuit diagram showing the configuration of a relay failure detection device of the MDPS according to an embodiment of the present invention, Figure 4 is a control signal of a transistor configured in the relay failure detection device of the MDPS according to an embodiment of the present invention Drawing.

Referring to this, the relay failure detection device of the MDPS according to an embodiment of the present invention more specifically through the ECU power circuit showing the circuit of the relay failure detection device of the MDPS, before the relay operation the relay stuck or burned out in the ignition cycle By detecting the possibility of fire and inability to operate the ECU in advance, the device eliminates the risk of a safety accident and enables easy vehicle management.

More specifically, the relay failure detection device 50 of the MDPS according to an embodiment of the present invention has a circuit similar to the conventional circuit. That is, the power supply circuit of the ECU constituting the present invention is provided with a first diode 32 for preventing the reverse connection of the battery terminal, and when the ECU 12 of the MDPS is in the operation mode due to key operation of the driver, The MCU 54 (Micro Controller Unit) configured to turn on the relay switch 40: S1 that senses the voltages of the first capacitor C1: 36 and the second capacitor C2: 38 to control a large current of the battery.

Here, the first capacitor (C1) and the second capacitor (C2) is a capacitor that charges the power to supply a large current instantaneously to the inverter for directly driving the motor, the first capacitor (C1) and the second capacitor ( C2) is generally in the capacity of thousands of microwatts or more.

In the conventional power supply circuit, the first capacitor C1: 36 and the second capacitor C2: 38 are operated when the relay switch 40: S1 is not charged above a proper voltage. An inrush current of several hundred amps was generated due to the voltages of the C1 and the second capacitors C2, the voltage difference of the battery, and the capacitor capacity, and thus the relay switch 40 could be damaged.

Therefore, in order to prevent damage to the relay switch 40 due to inrush current, the MDPS relay failure detecting apparatus 50 according to an embodiment of the present invention is connected to both ends of the inverter and the ground terminal, respectively. And a transistor 52 for discharging the electric charges charged in the first capacitor C1 and the second capacitor C2 by the control signal.

That is, while the transistor 52 is switched by the control signal of the MCU 54, the electric charges charged in the first capacitor C1 and the second capacitor C2 are discharged to the ground terminal.

In addition, the relay failure detection device 50 of the MDPS according to an embodiment of the present invention generates a switching signal to the transistor 52 when the relay switch 40 is turned off, performs a discharge process, and the relay switch ( 40 is provided with a MCU 52 for determining whether or not a failure.

At this time, the MCU 54 after the discharge of the charge charged in the first capacitor (C1) and the second capacitor (C2) by the switching of the transistor 52, the first capacitor (C1) and the second capacitor (C2). It is determined whether or not the relay switch 40 is broken by detecting the voltage of.

More specifically, the MCU 54 determines that the relay switch 40 is broken when the voltages of the first capacitor C1 and the second capacitor C2 are the same as or similar to the battery voltage. When 40 operates normally, the voltage difference between the battery voltage and the first capacitor C1 and the second capacitor C2 is very large, and thus it is not necessary to limit the similar range of the voltage. However, it is limited to the case of ± 5V or so.

On the other hand, the MCU 54 included in the MDPS relay failure detection device 50 according to an embodiment of the present invention, when it is determined that the relay switch 40 is a failure, a failure warning light provided in a cluster (not shown) ( A failure warning light may be further included to output the same.

With reference to the accompanying drawings will be described in detail the function and action of the relay failure detection device of MDPS according to an embodiment of the present invention of the above configuration.

The relay switch assumes that the voltage of the battery provided in the relay fault detection device 50 of the MDPS according to the embodiment of the present invention is V1, the voltages of the first capacitor C1 and the second capacitor C2 are V2, and When 40 is turned on, it is assumed that a voltage difference (voltage difference between the battery and the first capacitor C1 and the second capacitor C2) such that the inrush current does not affect the component is assumed to be Vth.

In this case, the MCU 54 applies a control signal to the transistor 52 to discharge the charges charged in the first capacitor C1 and the second capacitor C2.

In this state, after the preset time T has elapsed, the MCU 54 detects and compares the voltages of the first capacitor C1 and the second capacitor C2, and thus the first capacitor C1 and the second capacitor. The voltage of the capacitor C2 should be reduced in proportion to the time T and the duty width of the transistor 52, and assume that the voltage at this time is V3.

Then, when the relay switch 40 is normally turned off in the previous ignition cycle, the voltage V3 is very different from the battery voltage.

If the relay switch 40 is short-circuited due to a failure, the MCU 54 applies a control signal to the transistor 52 to discharge the charges charged in the first capacitor C1 and the second capacitor C2. Even with this, the current applied to the relay switch 40 causes V3 to be almost similar to the battery voltage.

Therefore, if the voltage difference is almost insignificant, the MCU 54 may determine that the relay switch 40 is short-circuited, and alert the cluster to the driver so that the driver may recognize the failure of the relay switch. As a result, it is possible to prevent a fire due to the inrush current and the malfunction of the ECU.

On the other hand, the MDPS relay failure detection apparatus according to an embodiment of the present invention is not limited only to the above-described embodiment is possible various modifications within the scope not departing from the technical gist.

32: first diode 36,38: first and second capacitors
40: relay switch 52: transistor
54: MCU

Claims (4)

A relay switch configured in an MDPS equipped with an ECU for sensing a steering torque of a driver and driving a steering motor, the relay switch intermittently to apply a large current of a battery to an inverter of a motor;
A first capacitor C1 and a second capacitor C2 for charging power to instantaneously supply a large current to the inverter directly driving the motor;
A transistor connected at both ends of the inverter and a ground terminal to discharge charges charged in the first capacitor C1 and the second capacitor C2 by a control signal;
The relay failure detection device of the MDPS, characterized in that configured to generate a switching signal to the transistor to turn off the relay switch, the discharge processing, and to determine whether the relay switch failure. The voltage of the first capacitor C1 and the second capacitor C2 after the discharge of the charge charged in the first capacitor C1 and the second capacitor C2 by switching the transistor. MDPS relay failure detection device, characterized in that for determining whether the relay switch failure. The method of claim 2, wherein the MCU determines that the relay switch is faulty when the voltages of the first capacitor C1 and the second capacitor C2 are equal to or less than ± 5V. Relay fault detection device. The apparatus of claim 1, wherein the MCU further comprises a failure warning light to output a failure warning light provided in the cluster when it is determined that the relay switch has a failure.
KR1020100122758A 2010-12-03 2010-12-03 Fault finding apparatus relay switch for mdps KR20120061437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100122758A KR20120061437A (en) 2010-12-03 2010-12-03 Fault finding apparatus relay switch for mdps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100122758A KR20120061437A (en) 2010-12-03 2010-12-03 Fault finding apparatus relay switch for mdps

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KR20120061437A true KR20120061437A (en) 2012-06-13

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160096449A (en) * 2015-02-05 2016-08-16 주식회사 만도 Electronic Control Apparatus and Power Control Method for Electronic Power Steering
US10202042B2 (en) 2013-10-04 2019-02-12 Samsung Sdi Co., Ltd. Electric vehicle power conversion system
KR20200023923A (en) * 2018-08-27 2020-03-06 현대모비스 주식회사 Method for checking and responding failure of mechanical relay for mdps

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10202042B2 (en) 2013-10-04 2019-02-12 Samsung Sdi Co., Ltd. Electric vehicle power conversion system
KR20160096449A (en) * 2015-02-05 2016-08-16 주식회사 만도 Electronic Control Apparatus and Power Control Method for Electronic Power Steering
KR20200023923A (en) * 2018-08-27 2020-03-06 현대모비스 주식회사 Method for checking and responding failure of mechanical relay for mdps

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