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KR100373258B1 - Device and method for preventing exhaust gas from heating by using oxygen sensor - Google Patents

Device and method for preventing exhaust gas from heating by using oxygen sensor Download PDF

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Publication number
KR100373258B1
KR100373258B1 KR1019970021407A KR19970021407A KR100373258B1 KR 100373258 B1 KR100373258 B1 KR 100373258B1 KR 1019970021407 A KR1019970021407 A KR 1019970021407A KR 19970021407 A KR19970021407 A KR 19970021407A KR 100373258 B1 KR100373258 B1 KR 100373258B1
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South Korea
Prior art keywords
voltage
exhaust gas
oxygen sensor
oxygen
fuel injection
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KR1019970021407A
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Korean (ko)
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KR19980085349A (en
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황계상
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기아자동차주식회사
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Priority to KR1019970021407A priority Critical patent/KR100373258B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A device for preventing heating of exhaust gas by using an oxygen sensor and a method thereof are provided to protect an engine and improve the durability by correcting the fuel injection amount or advancing the spark timing in detecting temperature over the reference value with converting the oxygen amount among exhaust gas into the voltage to an ECU(Electronic Control Unit). CONSTITUTION: An exhaust system of a vehicle comprises an oxygen sensor(2) measuring and converting the oxygen amount among exhaust gas into voltage during close loop control of an ECU(1) according to load and rpm of the engine, and measuring and converting temperature of exhaust gas into voltage during open loop control of the ECU; a voltage amplifier(4) amplifying voltage from the oxygen; the ECU inputting the amplified voltage, and controlling and outputting the signals; an injector(3) adjusting the fuel injection amount according to the signal from the ECU; and a warning lamp(5) turned on in an inner panel corresponding to the signal from the ECU.

Description

산소센서를 이용한 배기가스의 가열 방지장치 및 그 방법Exhaust gas heating device and method using oxygen sensor

본 발명은 산소센서를 이용한 배기가스의 가열 방지장치 및 그 방법에 관한 것으로, 더욱 상세하게는 배기가스 내의 산소량을 측정하는 산소센서는 특성상 온도가 증가하면 저항이 변화함으로 이를 전압으로 변경하여 이를 전자제어장치에 입력데이터로 사용하고, 이것이 어느 이상의 온도가 되는 것을 지시하면 연료 분사량 보정 또는 스파크 타이밍을 진각시킴으로서 엔진을 보호하고, 성능을 향상시키도록한 것이다.The present invention relates to an apparatus for preventing the heating of exhaust gas using an oxygen sensor and a method thereof. More specifically, an oxygen sensor for measuring the amount of oxygen in the exhaust gas changes its resistance to a voltage by changing its resistance when the temperature increases. When the controller is used as input data and instructs that the temperature is higher than a certain temperature, the engine is protected and the performance is improved by advancing fuel injection amount correction or spark timing.

일반적으로 자동차의 엔진을 작동시키는 데는 실린더 내에 혼합기를 흡입하는 흡기장치와, 연소후의 가스를 배출하는 배기장치가 있다. 이러한 흡기장치는 실린더에 흡입하는 공기중에 먼지 등을 제거하는 에어 클리너 및 각 실린더에 혼합기를 분배하는 흡기 매니폴드 등으로 구성되고, 배기장치는 각 실린더의 배기가스를 종합하는 매니폴드, 배기가스를 대기중으로 배출하는 배기파이프 및 배기소음을 저하시키는 소음기, 배기파이프의 중간에 설치되어 유해한 가스를 무해한 가스로 산화 및 환원시키는 촉매장치 등으로 구성되어 있다.In general, there are an intake device for injecting a mixer into a cylinder and an exhaust device for discharging gas after combustion. The intake apparatus is composed of an air cleaner for removing dust and the like in the air sucked into the cylinder, and an intake manifold for distributing the mixer to each cylinder. It consists of an exhaust pipe discharged into the atmosphere, a silencer that reduces exhaust noise, and a catalytic device installed in the middle of the exhaust pipe to oxidize and reduce harmful gases to harmless gases.

상기에 있어서, 배기가스 내의 산소량을 측정하여 연료 분사량을 조절하는 종래의 장치는 도 1에 도시된 바와같이 배기가스 내의 산소량을 측정하여 출력하는 산소센서(2)와, 상기한 산소센서(2)에서 출력되는 신호가 입력되고, 이 입력된 신호를 제어하여 출력하는 전자제어장치(1); Electronic Control Unit)와, 상기한 전자제어장치(1)에서 출력되는 신호에 의해 연료 분사량을 조절하는 인젝터(3)로 이루어진 것이다.In the above, the conventional apparatus for adjusting the fuel injection amount by measuring the amount of oxygen in the exhaust gas is an oxygen sensor (2) for measuring and outputting the amount of oxygen in the exhaust gas, as shown in Figure 1, the oxygen sensor (2) An electronic controller 1 for inputting a signal output from the electronic device and controlling and outputting the input signal; Electronic control unit) and the injector 3 for adjusting the fuel injection amount by the signal output from the electronic control device 1 described above.

이와같이 배기가스 내의 산소량을 측정하여 연료 분사량을 조절하는 방법은 배기가스 내의 산소량을 산소센서(2)로 측정하여 출력하는 단계와, 상기한 산소센서(2)에서 출력되는 신호는 전자제어장치(1)로 입력되고, 이 입력된 신호를 전자제어장치(1)에서 제어하여 출력하는 단계와, 상기한 전자제어장치(1)에서 출력되는 신호에 의해 인젝터(3)에서 연료 분사량을 가감하는 단계로 이루어지는 것이다.As described above, the method for adjusting the fuel injection amount by measuring the amount of oxygen in the exhaust gas is performed by measuring the amount of oxygen in the exhaust gas with the oxygen sensor 2 and outputting the same, and the signal output from the oxygen sensor 2 is an electronic controller 1. ) Is controlled by the electronic controller 1 and outputs the input signal, and the amount of fuel injected by the injector 3 is adjusted by the signal output from the electronic controller 1. It is done.

상기한 산소센서(2; EGO 센서)는 배기가스 내의 산소량을 측정하여 이를λ=1(λ;설정 값)과 비교하여 연료 분사량을 가감하였다. 또한, 상기의 산소센서(2)는 일정영역에서 λ=1이 되도록 제어하여 산소의 농도를 측정하고, 이를 전자제어장치(1)에 입력함으로서 인젝터(3)의 연료량을 증감하여 항상 λ=1이 되도록 운전하였던 것이다.The oxygen sensor 2 (EGO sensor) measures the amount of oxygen in the exhaust gas and compares it with lambda = 1 (lambda; set value) to add or subtract fuel injection amount. In addition, the oxygen sensor 2 measures the concentration of oxygen by controlling so that λ = 1 in a predetermined region, and inputs it to the electronic controller 1 to increase or decrease the amount of fuel in the injector 3 so that λ = 1. It was driving to be.

그러나, 고속 고부하의 경우에는 도 2에 도시된 바와같이 오픈 루프(Open Loop)가 되면서 산소센서(2)에 의한 제어가 되지 않으며, 특히 배기가스의 온도가 과다하게 증가하는 경우에도 즉, 오픈루프의 경우는 전자제어장치(1)의 입력 신호에 의해 엔진(E)이 제어됨으로 엔진(E)의 상태 및 배기가스의 온도 등을 측정하여 이에 대응할 방법이 없었다.However, in the case of high speed and high load, as shown in FIG. 2, the open loop is not controlled by the oxygen sensor 2, and in particular, even when the exhaust gas temperature is excessively increased, that is, the open loop. In this case, since the engine E is controlled by the input signal of the electronic controller 1, there is no method of measuring the state of the engine E and the temperature of the exhaust gas.

즉, 배기가스의 온도가 과다하게 상승하여 엔진(E)에 무리가 되면 엔진(E)이 파손되거나 혹은 촉매의 온도가 상승하여 파손이 되는 경우가 발생되어 엔진의 내구성 및 촉매의 내구성을 저하시키는 문제점이 있었던 것이다.In other words, if the exhaust gas temperature rises excessively and becomes excessive to the engine E, the engine E may be damaged or the catalyst temperature may rise and be damaged, thereby reducing the durability of the engine and the durability of the catalyst. There was a problem.

본 발명은 이와같은 문제점을 해결하기 위하여 발명된 것으로, 차량의 배기가스를 감지하는 산소센서는 온도가 증가하면 저항이 변화함으로써 이를 전압으로 변경하여 그 신호를 전자제어장치에 입력하고, 이것이 어느 이상의 온도가 되는 것을 지시하면 연료 분사량 보정 또는 스파크 타이밍을 진각시켜 엔진의 이상 현상 감지에 의한 엔진 내구성을 향상시키고, 촉매에의 과다한 열 유입 방지로 내구성 향상시키도록 한 산소센서를 이용한 배기가스의 가열 방지장치 및 그 방법을 제공함에 그 목적이 있다.The present invention has been invented to solve such a problem, the oxygen sensor for detecting the exhaust gas of the vehicle changes the resistance by changing the voltage when the temperature increases and inputs the signal to the electronic control device, which is any When the temperature is instructed, fuel injection volume correction or spark timing is advanced to improve engine durability by detecting abnormality of the engine and to prevent heat from exhaust gas by using an oxygen sensor to improve durability by preventing excessive heat inflow into the catalyst. It is an object of the present invention to provide an apparatus and a method thereof.

도 1은 종래의 산소센서를 이용한 배기가스 가열 방지장치를 나타낸 계략도,1 is a schematic diagram showing an exhaust gas heating prevention device using a conventional oxygen sensor,

도 2는 산소센서의 감지 영역을 나타낸 그래프 선도,2 is a graph showing the detection area of the oxygen sensor,

도 3은 본 발명에 따른 산소센서를 이용한 배기가스 가열 방지장치를 나타낸 계략도.Figure 3 is a schematic diagram showing an exhaust gas heating prevention device using an oxygen sensor according to the present invention.

- 도면의 주요 부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawing-

1 - 전자제어장치(Electronic Control Unit)1-Electronic Control Unit

2 - 산소센서 3 - 인젝터2-oxygen sensor 3-injector

4 - 전압증폭기 5 - 경고등4-Voltage Amplifier 5-Warning Light

상기와 같은 목적을 달성하기 위한 본 발명은, 차량의 배기장치를 구성함에 있어서, 엔진의 부하 및 회전수 조건에 의해 전자제어장치가 클로즈 루프 제어를 하는 경우에는 배기가스 내의 산소량을 측정하여 이를 전압으로 변환시켜 출력하며, 오픈 루프 제어를 하는 경우에는 배기가스의 온도를 측정하여 이를 전압으로 변화시켜 출력하는 산소센서와, 상기한 산소센서에서 출력되는 낮은 전압을 높은 전압으로 증폭하는 전압증폭기와, 상기 증폭된 전압이 입력되고, 이 입력된 신호를 제어하여 출력하는 전자제어장치와, 상기한 전자제어장치에서 출력되는 신호에 의해 연료 분사량을 조절하는 인젝터 및 상기한 전자제어장치에서 출력되는 신호에 의해 온(On)되는 인패널에 설치된 경고등으로 이루어진 것을 특징으로 한다.The present invention for achieving the above object, in the configuration of the vehicle exhaust system, when the electronic control device performs the closed loop control by the load and the number of revolutions conditions of the engine to measure the amount of oxygen in the exhaust gas voltage In the case of open loop control, the oxygen sensor measures the temperature of the exhaust gas and converts it into a voltage, and outputs the voltage. The voltage amplifier amplifies the low voltage output from the oxygen sensor to a high voltage. The amplified voltage is input, an electronic controller for controlling and outputting the input signal, an injector for adjusting the fuel injection amount by a signal output from the electronic controller, and a signal output from the electronic controller. It is characterized by consisting of a warning light installed on the in-panel (On) by.

또한 본 발명은, 엔진의 부하 및 회전수 조건에 의해 전자제어장치가 클로즈 루프 제어를 하는 경우에는 배기가스 내의 산소량을 산소센서로 측정하여 이를 전압으로 변환시켜 출력하며, 오픈 루프 제어를 하는 경우에는 배기가스의 온도를 산소센서로 측정하여 이를 전압으로 변화시켜 출력하는 단계와, 상기한 산소센서에서 출력되는 낮은 전압을 전압증폭기에서 높은 전압으로 증폭하는 단계와, 상기 증폭된 전압은 전자제어장치로 입력되고, 이 입력된 신호를 전자제어장치에서 제어하여 출력하는 단계와, 상기한 전자제어장치에서 출력되는 신호에 의해 인젝터에서 연료분사량을 증가시킴과 동시에 인패널의 경고등을 온(On)시키는 단계와, 상기한 인젝터에 의해 연료분사량이 증가된 후 일정 시간이 경과되었는데도 배기가스의 온도가 저감되지 않으면 전자제어장치의 데이터가 원래의 값으로 환원됨과 동시에 경고음을 발생하는 단계로 이루어지는 것을 특징으로 한다.In addition, the present invention, when the electronic control device performs the closed loop control according to the load and the number of revolutions of the engine conditions, the amount of oxygen in the exhaust gas is measured by the oxygen sensor and converted into a voltage and output, and in the case of open loop control Measuring the temperature of the exhaust gas with an oxygen sensor and outputting the same by converting the voltage into a voltage; amplifying a low voltage output from the oxygen sensor into a high voltage in a voltage amplifier; Controlling the controller to output the input signal, and increasing the fuel injection amount in the injector by the signal output from the electronic controller and turning on the warning light of the in-panel. The temperature of the exhaust gas is not reduced even after a certain time has elapsed after the fuel injection amount is increased by the injector. If the data is characterized in that the electronic control unit at the same time comprising the steps of: generating an alarm as soon as a reduction of the original value.

이하, 본 발명을 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 산소센서를 이용한 배기가스 가열 방지장치를 나타낸 개략도로서, 본 발명에 따른 장치는 차량의 배기장치를 구성함에 있어서, 배기가스 내의 산소량을 측정하여 이를 전압으로 변환시켜 출력하는 산소센서(2)와, 상기한 산소센서(2)에서 출력되는 낮은 전압을 높은 전압으로 증폭하는 전압증폭기(4)와, 상기 증폭된 전압이 입력되고, 이 입력된 신호를 제어하여 출력하는 전자제어장치(1)와, 상기한 전자제어장치(1)에서 출력되는 신호에 의해 연료 분사량을 조절하는 인젝터(3) 및 상기한 전자제어장치(1)에서 출력되는 신호에 의해 온(On)되는 인패널(5')에 설치된 경고등(5)으로 이루어진 것이다.Figure 3 is a schematic diagram showing an exhaust gas heating prevention device using an oxygen sensor according to the present invention, the device according to the present invention in the configuration of the exhaust system of the vehicle, by measuring the amount of oxygen in the exhaust gas is converted to a voltage and output An oxygen sensor 2, a voltage amplifier 4 for amplifying the low voltage output from the oxygen sensor 2 to a high voltage, and the amplified voltage is input, and an electron for controlling and outputting the input signal On by the control device 1, the injector 3 for adjusting the fuel injection amount by the signal output from the electronic control device 1 and the signal output from the electronic control device 1 It consists of a warning light (5) installed on the in-panel (5 ').

또한, 본 발명에 따른 산소센서를 이용한 배기가스 가열 방지방법은 배기가스 내의 산소량을 산소센서(2)로 측정하여 이를 전압으로 변환시켜 출력하는 단계와, 상기한 산소센서(2)에서 출력되는 낮은 전압을 전압증폭기(4)에서 높은 전압으로 증폭하는 단계와, 상기 증폭된 전압은 전자제어장치(1)로 입력되고, 이 입력된 신호를 전자제어장치(1)에서 제어하여 출력하는 단계와, 상기한 전자제어장치(1)에서 출력되는 신호에 의해 인젝터(3)에서 연료 분사량을 증가시킴과 동시에 인패널(5')의 경고등(5)을 온(On)시키는 단계와, 상기한 인젝터(3)에 의해 연료 분사량이 증가된 후 일정 시간이 경과되었는데도 배기가스의 온도가 저감되지 않으면 전자제어장치(1)의 데이터가 원래의 값으로 환원됨과 동시에 경고음을 발생하는 단계로 이루어지는 것이다.In addition, the exhaust gas heating prevention method using the oxygen sensor according to the present invention by measuring the amount of oxygen in the exhaust gas by the oxygen sensor (2) and converts it to voltage and outputs, and the low output from the oxygen sensor (2) Amplifying the voltage to a high voltage in the voltage amplifier 4, the amplified voltage is input to the electronic controller 1, and controlling and outputting the input signal by the electronic controller 1; Increasing the fuel injection amount in the injector 3 by the signal output from the electronic control device 1, and at the same time turning on the warning light (5) of the in-panel 5 ', the injector ( If the temperature of the exhaust gas is not reduced even after a certain time has elapsed after the fuel injection amount is increased by 3), the data of the electronic controller 1 is reduced to the original value and at the same time, a warning sound is generated.

이와같이 구성된 본 발명의 산소센서(2)는 산소의 농도에 의해서 전압이 변화함으로써, 이를 산소센서(2) 내의 코일에 의해 온도에 따라 변화하는 저항의 특성을 이용하여 배기가스의 온도를 측정하는 것이다. 즉, 상기의 산소센서(2)는 낮은 온도에서는 높은 저항을 갖게 되며(~MΩ) 높은 온도에서는 낮은 저항(1kΩ)을 갖게 된다.The oxygen sensor 2 of the present invention configured as described above measures the temperature of the exhaust gas by using a characteristic of resistance that changes with temperature by a coil in the oxygen sensor 2 as the voltage changes by the concentration of oxygen. . That is, the oxygen sensor 2 has high resistance at low temperature (~ MΩ) and low resistance (1 kΩ) at high temperature.

이와같은 저항의 변화를 이용하여 도 2에 도시된 클로즈 루프(Close Loop) 상태에서 운전시 엔진(E)의 이상 등에 의한 배기가스 온도가 급격히 증가하는 경우 이를 방지할 수 있는 것이다. 다시 말해 산소센서(2)에서 입력되는 신호는 저항 값이 고온이 되면서 낮은 값이 되므로 이를 전자제어장치(1)에 입력되기 전에 전압증폭기(4)를 사용하여 증폭시킨 후, 이를 전자제어장치(1)에 입력시키는 것이다. 이때, 상기의 전자제어장치(1)에는 미리 어느 정도의 한계를 갖는 기준 값을 설정하고, 이 기준 값 이상이 되면 전자제어장치(1)는 이를 인젝터(3)에 신호를 보내 분사량을 조정(연료 분사량을 증가시켜 연료에 의한 냉각효과를 얻음)함과 동시에, 인패널(In-Panel)에 설치된 경고등(5)이 온(On)되는 것이다.By using such a change in resistance when the exhaust gas temperature due to the abnormality of the engine (E), etc. during operation in the close loop (Close Loop) state shown in Figure 2 can be prevented. In other words, since the signal input from the oxygen sensor 2 becomes a low value as the resistance value becomes high, it is amplified using the voltage amplifier 4 before being input to the electronic control device 1 and then the electronic control device ( To 1). At this time, the electronic control apparatus 1 sets a reference value having a certain limit in advance, and when the reference value is equal to or more than the reference value, the electronic control apparatus 1 sends a signal to the injector 3 to adjust the injection amount ( The fuel injection amount is increased to obtain a cooling effect by the fuel), and at the same time, the warning lamp 5 installed in the in-panel is turned on.

그러나, 어느 일정 시간이 지나도 배기가스의 온도가 저하되지 않는 경우에는 전자제어장치(1)의 데이터 값을 원래 값으로 환원시키면서 경고음이 울려 무리한 운전을 하지 못하도록 하는 것으로, 이는 인젝터(3)에서 연료 분사량이 계속 증가되면 엔진에는 악 영향이 발생되므로 엔진을 보호하기 위함이다.However, when the temperature of the exhaust gas does not decrease after a certain time, the alarm sound sounds while reducing the data value of the electronic controller 1 to its original value, thereby preventing excessive operation. If the injection volume continues to increase, the engine will be adversely affected to protect the engine.

이상의 설명에서 알 수 있듯이 본 발명의 산소센서를 이용한 배기가스의 가열 방지장치 및 그 방법에 의하면, 차량의 배기가스 내의 산소량을 측정하여 이를 전압으로 변경하고, 이 전압을 전자제어장치에 입력하고, 어느 이상의 온도가 되면 인젝터에서 연료 분사량을 보정하도록 신호를 출력함으로써, 엔진을 보호하고, 성능을 향상시킬 수 있는 효과가 있다.As can be seen from the above description, according to the apparatus for preventing the heating of the exhaust gas using the oxygen sensor of the present invention and the method, the amount of oxygen in the exhaust gas of the vehicle is measured and changed into a voltage, and the voltage is inputted to the electronic controller. When the temperature reaches a certain temperature, a signal is output from the injector to correct the fuel injection amount, thereby protecting the engine and improving performance.

Claims (2)

차량의 배기장치를 구성함에 있어서, 엔진의 부하 및 회전수 조건에 의해 전자제어장치가 클로즈 루프 제어를 하는 경우에는 배기가스 내의 산소량을 측정하여 이를 전압으로 변환시켜 출력하며, 오픈 루프 제어를 하는 경우에는 배기가스의 온도를 측정하여 이를 전압으로 변화시켜 출력하는 산소센서와, 상기한 산소센서에서 출력되는 낮은 전압을 높은 전압으로 증폭하는 전압증폭기와, 상기 증폭된 전압이 입력되고, 이 입력된 신호를 제어하여 출력하는 전자제어장치와, 상기한 전자제어장치에서 출력되는 신호에 의해 연료 분사량을 조절하는 인젝터 및 상기한 전자제어장치에서 출력되는 신호에 의해 온(On)되는 인패널에 설치된 경고등으로 이루어진 것을 특징으로 하는 산소센서를 이용한 배기가스의 가열 방지장치.In the configuration of the vehicle exhaust system, when the electronic control apparatus performs the closed loop control according to the engine load and the rotational speed condition, the amount of oxygen in the exhaust gas is measured and converted into a voltage and output, and the open loop control is performed. An oxygen sensor which measures the temperature of the exhaust gas and converts it into a voltage and outputs it, a voltage amplifier that amplifies the low voltage output from the oxygen sensor to a high voltage, and the amplified voltage is input, and the input signal is input. An electronic control device for controlling and outputting the control unit, an injector for adjusting the fuel injection amount by the signal output from the electronic control device, and a warning light installed in the in-panel that is turned on by the signal output from the electronic control device. Heating prevention device of the exhaust gas using an oxygen sensor, characterized in that made. 엔진의 부하 및 회전수 조건에 의해 전자제어장치가 클로즈 루프 제어를 하는 경우에는 배기가스 내의 산소량을 산소센서로 측정하여 이를 전압으로 변환시켜 출력하며, 오픈 루프 제어를 하는 경우에는 배기가스의 온도를 산소센서로 측정하여 이를 전압으로 변화시켜 출력하는 단계와, 상기한 산소센서에서 출력되는 낮은 전압을 전압증폭기에서 높은 전압으로 증폭하는 단계와, 상기 증폭된 전압은 전자제어장치로 입력되고, 이 입력된 신호를 전자제어장치에서 제어하여 출력하는 단계와, 상기한 전자제어장치에서 출력되는 신호에 의해 인젝터에서 연료분사량을 증가시킴과 동시에 인패널의 경고등을 온(On)시키는 단계와, 상기한 인젝터에 의해 연료분사량이 증가된 후 일정 시간이 경과되었는데도 배기가스의 온도가 저감되지 않으면 전자제어장치의 데이터가 원래의 값으로 환원됨과 동시에 경고음을 발생하는 단계로 이루어지는 것을 특징으로 하는 산소센서를 이용한 배기가스의 가열 방지방법.When the electronic control device performs the closed loop control according to the engine load and the rotational speed condition, the amount of oxygen in the exhaust gas is measured by the oxygen sensor and converted into a voltage, and when the open loop control is performed, the temperature of the exhaust gas is measured. Measuring by an oxygen sensor and converting it into a voltage and outputting the amplified voltage; and amplifying a low voltage output from the oxygen sensor into a high voltage in a voltage amplifier, and the amplified voltage is input to an electronic controller. Outputting the controlled signal by the electronic controller; increasing the fuel injection amount in the injector by the signal output from the electronic controller; and turning on the warning light of the in-panel; If the temperature of the exhaust gas is not reduced even after a certain time has elapsed after the fuel injection amount is increased by Heating prevent the exhaust gas value data using an oxygen sensor, characterized in that at the same time as reducing the value of the original comprising the steps of: generating a warning sound.
KR1019970021407A 1997-05-28 1997-05-28 Device and method for preventing exhaust gas from heating by using oxygen sensor KR100373258B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10422262B2 (en) 2016-08-01 2019-09-24 Hyundai Motor Company Method for catalyst heating control

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Publication number Priority date Publication date Assignee Title
JPS57160929U (en) * 1981-04-06 1982-10-08
JPS63212750A (en) * 1987-02-27 1988-09-05 Toyota Motor Corp Abnormality detecting device for secondary air feeding mechanism
JPH031273U (en) * 1989-05-29 1991-01-09
KR970040874U (en) * 1995-12-18 1997-07-29 Engine preheat warning device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57160929U (en) * 1981-04-06 1982-10-08
JPS63212750A (en) * 1987-02-27 1988-09-05 Toyota Motor Corp Abnormality detecting device for secondary air feeding mechanism
JPH031273U (en) * 1989-05-29 1991-01-09
KR970040874U (en) * 1995-12-18 1997-07-29 Engine preheat warning device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10422262B2 (en) 2016-08-01 2019-09-24 Hyundai Motor Company Method for catalyst heating control

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