KR20030077051A - Protection device of vehicle sensor - Google Patents

Protection device of vehicle sensor Download PDF

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Publication number
KR20030077051A
KR20030077051A KR1020020015940A KR20020015940A KR20030077051A KR 20030077051 A KR20030077051 A KR 20030077051A KR 1020020015940 A KR1020020015940 A KR 1020020015940A KR 20020015940 A KR20020015940 A KR 20020015940A KR 20030077051 A KR20030077051 A KR 20030077051A
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South Korea
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voltage
sensor
driving
microcomputer
switching unit
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KR1020020015940A
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Korean (ko)
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KR100799496B1 (en
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손홍엽
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주식회사 만도
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Gyroscopes (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: A device for protecting a sensor is provided to prevent the damage of the sensor by shutting off drive voltage supplied to the sensor when abnormal voltage is supplied to the sensor. CONSTITUTION: A switching unit(30) is driven by a control signal, and switches on to supply drive voltage supplied from a power supply unit(20) to a sensor(40). A voltage detecting unit(50) detects the drive voltage supplied to the sensor. A microcomputer(10) compares the detected voltage with a reference voltage, and generates a control signal for driving the switching unit to shut off the drive voltage if the detected voltage is more/less than the reference voltage.

Description

차량용 센서의 보호장치 {Protection device of vehicle sensor}Protection device of vehicle sensor

본 발명은 센서의 보호장치에 관한 것으로, 특히 차량에 장착된 각종 센서가 비정상적인 구동전압에 의해 파손되거나, 오작동되지 않도록 하기 위한 차량용 센서의 보호장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for a sensor, and more particularly to a protection device for a vehicle sensor for preventing various sensors mounted on a vehicle from being damaged or malfunctioned by abnormal driving voltages.

일반적으로, 차량에는 차량의 상태를 인지하기 위한 각종 센서들이 마련되어 있으며, 이러한 센서들의 센싱정보에 기초하여 차량의 제어동작을 수행하게 된다.In general, the vehicle is provided with a variety of sensors for recognizing the state of the vehicle, and performs the control operation of the vehicle based on the sensing information of these sensors.

종래에는 이러한 센서들은 배터리 또는 별도의 전원공급 장치에 의해서 구동전압을 직접 인가받고 있으며, 적절한 전압의 공급에 의해 정상동작되도록 구성되어 있다.Conventionally, such sensors are directly applied with a driving voltage by a battery or a separate power supply device, and are configured to operate normally by supplying an appropriate voltage.

그러나, 센서에 정상적인 구동전압보다 과전압이 인가되거나, 저전압이 인가되는 경우에는 센서가 파손되거나, 정상적인 센싱정보를 출력하지 못하고 오작동하게 된다. 이에 따라, 운전자가 이에 대한 적절한 조치를 취하지 못한 상태에서 차량을 계속 운행하는 경우에는 차량의 안정을 해치게 되는 문제점이 있다.However, when an overvoltage or a low voltage is applied to the sensor than a normal driving voltage, the sensor may be damaged or malfunction without outputting normal sensing information. Accordingly, when the driver continues to operate the vehicle in a state in which the driver does not take appropriate measures therein, there is a problem that the stability of the vehicle is impaired.

본 발명은 전술한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 센서에 공급되는 구동전압의 이상여부를 진단하여 이상인 경우에는 센서에 구동전압의 공급을 차단시킴과 함께 운전자에게 이를 알리는 데 있다.The present invention is to solve the above-mentioned problems, an object of the present invention is to diagnose the abnormality of the drive voltage supplied to the sensor and to notify the driver with the interruption of the supply of the drive voltage to the sensor in case of abnormality.

도 1은 본 발명에 따른 차량용 센서의 보호장치에 대한 블록도이다.1 is a block diagram of a protection device for a vehicle sensor according to the present invention.

도 2는 본 발명에 따른 실시예로 차량용 센서의 보호장치에 대한 회로도이다.2 is a circuit diagram of a protective device for a vehicle sensor according to an embodiment of the present invention.

*도면의 주요 기능에 대한 부호의 설명** Description of the code for the main functions of the drawings

10 : 마이컴20 : 전원공급부10: microcomputer 20: power supply unit

30 : 스위칭부40 : 센서30: switching unit 40: sensor

50 : 전압검출부60 : 고장표시부50: voltage detection unit 60: fault display unit

전술한 목적을 달성하기 위한 본 발명은 차량의 상태를 검출하기 위한 센서와 상기 센서에 소정의 구동전압을 공급하기 위한 전원공급원을 구비한 장치에 있어서, 소정의 제어신호에 따라 구동되며, 상기 센서에 상기 전원공급원에 의한 구동전압이 공급되도록 스위칭되는 스위칭부, 상기 스위칭부의 구동동작에 의해 상기 센서에 공급되는 구동전압을 검출하기 위한 전압검출부, 상기 전압검출부에서 검출된 전압을 미리 설정된 기준전압과 비교하여 과전압 또는 저전압인 경우, 상기 센서에 구동전압의 공급을 차단하기 위해 상기 스위칭부를 구동하기 위한 제어신호를 생성하는 마이컴을 포함하는 것을 특징으로 한다.The present invention for achieving the above object is a device having a sensor for detecting a state of the vehicle and a power supply source for supplying a predetermined driving voltage to the sensor, the sensor is driven according to a predetermined control signal, the sensor A switching unit which is switched to supply a driving voltage to the power supply source, a voltage detecting unit for detecting a driving voltage supplied to the sensor by a driving operation of the switching unit, and a voltage detected by the voltage detecting unit with a preset reference voltage. In comparison, in the case of overvoltage or undervoltage, the microcomputer generates a control signal for driving the switching unit to cut off the supply of the driving voltage to the sensor.

이하에서는 본 발명의 바람직한 실시예를 본 도면을 참조하여 상세하게 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

도 1은 본 발명에 따른 차량용 센서(40)의 보호장치에 대한 블록도이다. 도 1에 도시된바 같이, 본 발명은 마이컴(10)에서 제어신호에 따라 트랜지스터(Q1)와 전계효과 트랜지스터(FET)를 온시켜 전원공급부(20)에서 센서(40)에 전원을 인가하도록 스위칭되는 스위칭부(30), 스위칭부(30)의 스위칭동작에 의해 센서(40)에 실제 공급되는 구동전압이 미리 설정된 정상적인 구동전압인지를 알기 위해 센서(40)에 공급되는 구동전압을 검출하는 전압검출부(50), 전압검출부(50)로부터 검출된 전압값에 따라 센서(40)에 공급되는 전압의 이상여부를 판단하고, 이상전압인 경우에는 스위칭부(30)를 오프시켜 전원공급부(20)에 의한 전원이 센서(40)에 공급되지 않도록 제어함과 함께 운전자에게 센서(40)의 고장을 알리기 위해 고장표시부(60)에 고장정보를 표시시키기 위한 제어동작을 수행하는 마이컴(10)으로 이루어진다.1 is a block diagram of a protection device for a vehicle sensor 40 according to the present invention. As shown in FIG. 1, the present invention turns on the transistor Q1 and the field effect transistor FET in accordance with a control signal in the microcomputer 10 to switch the power supply unit 20 to apply power to the sensor 40. A voltage for detecting the driving voltage supplied to the sensor 40 in order to know whether the driving voltage actually supplied to the sensor 40 by the switching operation of the switching unit 30 and the switching unit 30 is a predetermined normal driving voltage. The abnormality of the voltage supplied to the sensor 40 is determined according to the voltage value detected by the detector 50 and the voltage detector 50, and in the case of the abnormal voltage, the power supply unit 20 is turned off by switching off the switching unit 30. By controlling the power supply to the sensor 40 and to inform the driver of the failure of the sensor 40, the microcomputer 10 performs a control operation for displaying the fault information on the fault display unit 60. .

도 1의 동작을 살펴보면, 운전자에 의해 차량에 시동이 걸리면, 마이컴(10)에서는 제어신호를 출력하여 스위칭부(30)를 구동시킨다. 이에 따라, 스위칭부(30)의 스위칭동작에 의해 센서(40)에 전원공급부(20)에 의한 전원이 공급되고, 전압검출부(50)에도 센서(40)에 공급되는 전원과 동일한 전원이 공급되게 된다.Referring to the operation of FIG. 1, when the vehicle is started by the driver, the microcomputer 10 outputs a control signal to drive the switching unit 30. Accordingly, the power supply by the power supply unit 20 is supplied to the sensor 40 by the switching operation of the switching unit 30, and the same power as that supplied to the sensor 40 is supplied to the voltage detection unit 50. do.

전압검출부(50)에서는 전압분배법칙에 따라 분배된 신호전압을 마이컴(10)으로 전송하게 된다. 이 신호전압은 아날로그/디지탈(A/D) 변환기에 의해 디지탈 신호로 변환되어 마이컴(10)에 입력된다.The voltage detector 50 transmits the signal voltage divided according to the voltage division law to the microcomputer 10. This signal voltage is converted into a digital signal by an analog / digital (A / D) converter and input to the microcomputer 10.

마이컴(10)은 이 신호전압을 미리 설정된 기준전압과 비교하여 센서(40)에 공급되는 전압이 기준전압보다 과전압인지 또는 저전압인지를 인식하게 되며, 과전압 또는 저전압인경우에는 전원공급부(20)에 의한 과전압 또는 저전압이 센서(40)에 입력되어 센서(40)가 오작동하거나, 파손되는 것을 방지할 수 있도록 스위칭부(30)를 오프시킴과 함께 고장표시부(60)에 문자 또는 숫자를 통해 표시함으로써 현재 발생된 고장에 대해 운전자에게 경고하도록 제어한다.The microcomputer 10 compares the signal voltage with a preset reference voltage to recognize whether the voltage supplied to the sensor 40 is overvoltage or undervoltage than the reference voltage, and when the overvoltage or undervoltage is applied to the power supply unit 20. By turning off the switching unit 30 and preventing the sensor 40 from malfunctioning or being damaged by being input to the sensor 40 by the overvoltage or undervoltage. Controls the driver to be alerted about current faults.

도 2는 본 발명에 따른 실시예로 차량용 센서의 보호장치에 대한 회로도이다.2 is a circuit diagram of a protective device for a vehicle sensor according to an embodiment of the present invention.

차량용 센서에 차륜의 회전방향 및 차륜속도를 감지하는 스마트 액티브 휠 속도센서(Smart Active Wheel Speed Sensor ; 이하 액티브 휠 속도센서(40)라 칭함)를 예를 들어 도 2를 설명하면, 액티브 휠 속도센서(40)에 배터리 전원(Vbat+)을 인가하기 위하여 마이컴(10)에서 로우레벨신호(L)(0V)를 스위칭부(30)에 출력하면, 스위칭부(30)의 트랜지스터(Q1)의 베이스(B)와 에미터(E)사이의 전압(VBE)이 하이(HIGH)(Vbat+)가 되어서 트랜지스터(Q1)는 오프되고, 배터리 전압(Vbat+)가 전계효과 트랜지스터(FET)의 게이트(G)에 입력되어 전계효과 트랜지스터(FET)가 온 된다.For example, referring to FIG. 2, a smart active wheel speed sensor (hereinafter referred to as an active wheel speed sensor 40) that detects a rotational direction and a wheel speed of a wheel in a vehicle sensor is described. When the microcomputer 10 outputs the low level signal L (0V) to the switching unit 30 in order to apply the battery power Vbat + to the 40, the base of the transistor Q1 of the switching unit 30 ( The voltage VBE between B) and the emitter E becomes HIGH (Vbat +) so that the transistor Q1 is turned off, and the battery voltage Vbat + is applied to the gate G of the field effect transistor FET. The field effect transistor FET is turned on.

전계효과 트랜지스터(FET)의 소스단(S)은 +7V의 제너다이오드(ZD1)에 연결되어 있으므로, 전계효과 트랜지스터(FET)의 드레인(D)과 소스(S)를 통하여 배터리 전압(Vbat+)이 +7V로 제한되어 액티브 휠 속도센서(40)의 입력전압단에 입력된다. 이때, 제너다이오드(ZD1)는 액티브 휠 속도센서(40)의 입력전압이 과도하게 상승하는 것을 방지하여 액티브 휠 속도센서(40)에 과도한 전압 및 전류가 인가되어 액티브 휠 속도센서(40)가 파괴되거나 오동작하는 것을 막기 위한 전압제한용소자이다. 그리고, 다이오드(D1)는 전계효과 트랜지스터(FET)에 센서(40)로부터 역으로 흐르는 전류를 방지하여 전계효과 트랜지스터(FET)를 보호하기 위한 것이며, 저항(R1)은 전류 제한용 저항이다.Since the source terminal S of the field effect transistor FET is connected to the zener diode ZD1 of + 7V, the battery voltage Vbat + is increased through the drain D and the source S of the field effect transistor FET. It is limited to + 7V and is input to the input voltage terminal of the active wheel speed sensor 40. At this time, the zener diode ZD1 prevents the input voltage of the active wheel speed sensor 40 from excessively increasing, so that excessive voltage and current are applied to the active wheel speed sensor 40, thereby destroying the active wheel speed sensor 40. It is a voltage limiting device to prevent the power supply or malfunction. The diode D1 is used to protect the field effect transistor FET by preventing a current flowing back from the sensor 40 to the field effect transistor FET, and the resistor R1 is a current limiting resistor.

전압검출부(50)는 배터리 전압(Vbat+)의 전원 불안정등으로 액티브 휠 속도센서(40)에 공급되는 전압이 그라운드 쇼트(Ground Short)되거나, 센서(40)에 공급되는 전압이 +7V이하인 경우를 모니터링하기 위한 것으로, 저항(R2)과 저항(R3)으로 이루어진 전압분배회로를 이루어져 있으며, 액티브 휠 속도센서(40)의 전원입력단과 병렬로 연결되어 액티브 휠 속도센서(40)에서 공급되는 전압과 동일한 레벨의 전압을 입력받아 저항(R2,R3)비에 따라 분배된 전압을 검출한다.The voltage detector 50 is a case where the voltage supplied to the active wheel speed sensor 40 is ground shorted or the voltage supplied to the sensor 40 is less than + 7V due to power instability of the battery voltage Vbat +. For monitoring, consisting of a voltage distribution circuit consisting of a resistor (R2) and a resistor (R3), and connected in parallel with the power input terminal of the active wheel speed sensor 40 and the voltage supplied from the active wheel speed sensor 40 and The voltage of the same level is input to detect the divided voltage according to the ratio of the resistors R2 and R3.

이렇게 검출된 전압은 마이컴(10)의 A/D 포트에 출력되며, 마이컴(10)에서는 이 검출전압과 미리 설정된 기준전압과 비교하여 과전압 또는 저전압인 경우에는 스위칭부(30)의 하이레벨의 신호(H)(5V)를 출력한다. 이에 따라, 트랜지스터(Q1)의 베이스(B)와 에미터(E)사이의 전압(VBE)이 LOW(GND) 전압이 되므로, 트랜지스터(Q1)는 온 되어 배터리 전압(Vbat+)이 그라운드(Ground)에 연결됨으로서 전계효과 트랜지스터(FET)가 오프되어 센서(40)에 공급되는 전압이 차단되어 센서의 파손 및 오작동을 방지하게 된다. 이와 동시에, 마이컴(10)은 고장표시부(60)에 액티브 휠 속도센서(40)의 고장정보를 출력하기 위한 제어동작을 수행하여 운전자에게 그 액티브 휠 속도센서(40)의 고장을 알린다.The detected voltage is output to the A / D port of the microcomputer 10, and the microcomputer 10 compares the detected voltage with a preset reference voltage and, in the case of overvoltage or low voltage, the high level signal of the switching unit 30. Outputs (H) (5V). Accordingly, since the voltage VBE between the base B and the emitter E of the transistor Q1 becomes the LOW (GND) voltage, the transistor Q1 is turned on so that the battery voltage Vbat + is grounded. By being connected to the field effect transistor (FET) is turned off to cut off the voltage supplied to the sensor 40 to prevent damage and malfunction of the sensor. At the same time, the microcomputer 10 notifies the driver of the failure of the active wheel speed sensor 40 by performing a control operation for outputting the failure information of the active wheel speed sensor 40 to the failure display unit 60.

이상에서 상세히 설명한 바와 같이, 본 발명은 센서에 공급되는 구동전압의이상여부를 감지하여 이상전압인 경우에는 센서의 구동전압을 차단시킴과 함께 이를 운전자에게 경고함으로서 센서의 파손을 방지할 뿐만 아니라, 운전자에게 센서의 고장을 인지시켜 빠른 시간 안에 정비토록 하는 효과가 있다.As described in detail above, the present invention not only prevents the sensor from being damaged by detecting whether the driving voltage supplied to the sensor is abnormal and shuts off the driving voltage of the sensor and warns the driver of the abnormal voltage. It has the effect of prompting the driver to detect the breakdown of the sensor so that it can be repaired quickly.

Claims (4)

차량의 상태를 검출하기 위한 센서와 상기 센서에 소정의 구동전압을 공급하기 위한 전원공급원을 구비한 장치에 있어서,An apparatus comprising a sensor for detecting a state of a vehicle and a power supply source for supplying a predetermined driving voltage to the sensor, the apparatus comprising: 소정의 제어신호에 따라 구동되며, 상기 센서에 상기 전원공급원에 의한 구동전압이 공급되도록 스위칭되는 스위칭부,A switching unit driven according to a predetermined control signal and switched to supply a driving voltage by the power supply source to the sensor; 상기 스위칭부의 구동동작에 의해 상기 센서에 공급되는 구동전압을 검출하기 위한 전압검출부,A voltage detecting unit for detecting a driving voltage supplied to the sensor by a driving operation of the switching unit; 상기 전압검출부에서 검출된 전압을 미리 설정된 기준전압과 비교하여 과전압 또는 저전압인 경우, 상기 센서에 구동전압의 공급을 차단하기 위해 상기 스위칭부를 구동하기 위한 제어신호를 생성하는 마이컴을 포함하는 것을 특징으로 하는 차량용 센서의 보호장치.And a microcomputer generating a control signal for driving the switching unit to cut off the supply of the driving voltage to the sensor when the voltage detected by the voltage detector is compared with a preset reference voltage. Protective device for vehicle sensors. 제 1항에 있어서,The method of claim 1, 상기 스위칭부는 상기 마이컴의 제어신호에 따라 스위칭되는 트랜지스터와 상기 트랜지스터의 스위칭 동작에 따라 구동되는 전계효과 트랜지스터로 이루어져 있으며, 상기 마이컴은 상기 전압검출부에서 검출된 전압이 과전압 또는 저전압인 경우, 상기 트랜지스터와 전계효과 트랜지스터를 오프시키는 것을 특징으로 하는 차량용 센서의 보호장치.The switching unit includes a transistor switched in accordance with a control signal of the microcomputer and a field effect transistor driven in accordance with a switching operation of the transistor. The microcomputer includes the transistor when the voltage detected by the voltage detector is overvoltage or undervoltage. A protective device for a vehicle sensor, characterized in that the field effect transistor is turned off. 제 1항에 있어서,The method of claim 1, 운전자에게 센서의 고장정보를 출력시키기 위한 고장표시부를 더 포함하며, 상기 마이컴은 상기 센서에 공급되는 전압이 과전압 또는 저전압인경우, 상기 고장표시부에 상기 고장정보를 출력시키기 위한 제어동작을 수행하는 것을 특징으로 하는 차량용 센서의 보호장치And a fault display unit for outputting fault information of the sensor to a driver, wherein the microcomputer performs a control operation to output the fault information to the fault display unit when the voltage supplied to the sensor is an overvoltage or a low voltage. Vehicle sensor protection device 제 1항에 있어서,The method of claim 1, 상기 과전압에 의해 상기 센서가 파손되지 않도록 상기 센서의 구동전압을 일정레벨의 전압으로 제한하기 위한 전압제한용 제너다이오드를 더 포함하는 것을 특징으로 하는 차량용 센서의 보호장치.And a zener diode for limiting voltage to limit the driving voltage of the sensor to a voltage of a predetermined level so that the sensor is not damaged by the overvoltage.
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