KR100432030B1 - air-fuel ratio control method for a Liquefied Petroleum Injection of a vehicle - Google Patents
air-fuel ratio control method for a Liquefied Petroleum Injection of a vehicle Download PDFInfo
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- KR100432030B1 KR100432030B1 KR10-2002-0015585A KR20020015585A KR100432030B1 KR 100432030 B1 KR100432030 B1 KR 100432030B1 KR 20020015585 A KR20020015585 A KR 20020015585A KR 100432030 B1 KR100432030 B1 KR 100432030B1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
Abstract
엘피아이 엔진의 냉시동시 O2센서가 활성화되기 전 까지의 공백구간에서 인젝터와 맵 센서를 통해 얻어진 공연비 정보를 갖고 임시적으로 엔진의 동작을 제어함과 동시에 O2센서 고장 발생시 정상 공연비 제어가 가능하도록 제어할 목적으로;LP child engine naengsi simultaneous O 2 sensor so as to from a space interval of up before activation has an air-fuel ratio information obtained through the injector and the map sensor can be provisionally operating the control, and at the same time O 2 sensor failure occurs, the normal air-fuel ratio control of the engine For control purposes;
차량이 시동되면 사용하는 모든 변수를 초기화하고, 검출되어 인가되는 O2센서 측정값을 입력받아 활성화 온도 이상인가를 판단하는 단계와; 상기 단계에서 O2센서 측정값이 활성화 온도 이상임이 판단되면, 흡기 유량과 인젝터의 연료 분사시간 및 분사량을 입력받아 공연비를 연산한 후, 해당하는 공연비 제어신호를 출력하는 단계로 이루어져 있어서, 냉시동시 인젝터와 맵 센서를 이용한 정상 공연비 진단이 가능하여, 시동초기 배기가스 배출을 저감할 수 있고, O2센서의 고장 시에도 정상 공연비 제어가 가능하다.Initializing all variables used when the vehicle is started, and determining whether or not the activation temperature is higher by receiving a detected and applied O 2 sensor measurement value; If it is determined that the O 2 sensor measured value is equal to or more than the activation temperature, the air-fuel ratio is calculated by receiving the intake air flow rate, the fuel injection time and the injection amount of the injector, and then outputting a corresponding air-fuel ratio control signal. It is possible to diagnose the normal air-fuel ratio by using the injector and the map sensor, thereby reducing the initial start-up exhaust gas emissions and controlling the normal air-fuel ratio even when the O 2 sensor fails.
Description
본 발명은 엘피아이(Liquefied Petroleum injection : LPI) 차량에 관한 것으로써, 더욱 상세하게는 엘피아이 연료 분사장치와 맵 센서를 이용한 엘피아이 차량의 공연비 제어 방법에 관한 것이다.The present invention relates to an LPIfied (Liquefied Petroleum injection (LPI)) vehicle, and more particularly to an air-fuel ratio control method of an Elpiai vehicle using an Elpia fuel injection device and a map sensor.
지금까지 엘피가스 차량은 액상상태의 엘피가스를 기화시켜 엔진으로 공기와 함께 공급하여 줌으로써, 차량의 동력을 발생시키는 연료로 사용하였다.Until now, the LPG vehicle has been used as a fuel for generating power of the vehicle by vaporizing the LP gas in the liquid state and supplying it with air to the engine.
최근에는 상기한 엘피 차량에서 액화된 연료 그대로 인젝터를 이용한 액화연료를 엔진으로 공기와 함께 공급하는 방식으로 배기가스 규제에 대응하기 위한 것으로, 연료, 점화 및 배기가스 제어를 하며 액상의 연료를 다중 연료 분사(MPI : Multi Point Injection)방식으로 연료를 공급하며, 엔진 성능을 최대로 끌어낼 수 있는 방식으로 많은 연구 및 실용화를 이루고 있다.Recently, the liquefied fuel using the injector as air liquefied in the above-mentioned LPI vehicle to respond to the exhaust gas regulation by supplying the air to the engine, controlling the fuel, ignition and exhaust gas, multi-fuel liquid fuel Fuel is supplied through multi-point injection (MPI), and a lot of research and practical use has been made in a way that can maximize engine performance.
상기한 엘피아이 차량은 종래에 MAF(Mass Air Flow) 센서를 이용하여 측정된 공기유량에 대해 엔진 제어 장치가 이론 공연비를 맞추기 위해 인젝터의 열림 시간을 제어하여 엔진에 분사시키고 있다.The ELPAI vehicle is conventionally sprayed on the engine by controlling the opening time of the injector in order to match the theoretical air-fuel ratio by the engine control device to the air flow rate measured using a MAF (Mass Air Flow) sensor.
이렇게 엔진 실린더에서 연소된 배기가스가 촉매를 거치게되는데, 이의 연료성분함량 정도를 진단하기 위해서 촉매 전, 후방에 산소센서를 설치하여 일반 대기중에 산소와 배기가스의 산소 농도차를 이용해 공연비를 제어하고 있다.The exhaust gas combusted in the engine cylinder passes through the catalyst.In order to diagnose the fuel content, the oxygen sensor is installed before and after the catalyst to control the air-fuel ratio by using the oxygen concentration difference between oxygen and exhaust gas in the general atmosphere. have.
상기한 엔진의 이론 공연비를 맞추기 위해 O2센서를 이용하여 람다(λ) 제어를 하는데, 이를 제어하기 위해서는 일정온도(섭씨 350℃) 이상을 필요로 하기 때문에 초기 시동시부터 이론 공연비를 맞추기가 어렵다.In order to adjust the theoretical air-fuel ratio of the engine, lambda (λ) control is performed using an O 2 sensor, and it is difficult to adjust the theoretical air-fuel ratio from the initial start because it requires a certain temperature (350 ° C) or more. .
이처럼, O2센서가 활성화되기 위해 필요한 온도를 LOT(Light-Off Temperature)라고 하는데, 이는 센서의 중요한 펙터이다. 초기 시동시 엔진이 예열이 되지 않아 배출된 배기가스의 온도는 낮기 때문에 촉매를 통해 나가는 배기가스의 람다 제어가 어려워, 엔진 제어 장치가 정확한 이론 공연비를 제어하지 못하는 것이다. 이로써, 시동 초기에 배출되는 배기가스는 총 배기가스의 80% 이상을 차지한다.As such, the temperature required for the O 2 sensor to activate is called LOT (Light-Off Temperature), which is an important factor of the sensor. Since the engine is not preheated during the initial start-up, the temperature of the exhaust gas is low, making it difficult to control the lambda of the exhaust gas passing through the catalyst, so that the engine controller cannot control the exact theoretical air-fuel ratio. As a result, the exhaust gas discharged at the beginning of the start-up occupies 80% or more of the total exhaust gas.
그러나, 상기와 같이 공연비를 제어하기 위해서는 산소센서가 활성화가 되어야 하는데, 보통 350℃의 활성화 온도 이상이 되어야 정상 공연비 진단이 가능하다.However, in order to control the air-fuel ratio as described above, the oxygen sensor should be activated, and the normal air-fuel ratio can be diagnosed only when the activation temperature is usually 350 ° C. or higher.
따라서, 냉시동시 엔진이 예열 되지 않은 관계로 배출가스의 온도가 상당히 낮아져서 O2센서가 활성화 온도 이하로 되면 정상 공연비 진단이 매우 어렵게 된다.Therefore, when the engine is not preheated during cold start, the temperature of the exhaust gas is considerably lowered so that the normal air-fuel ratio diagnosis becomes very difficult when the O 2 sensor is lower than the activation temperature.
이로 인해, 시동초기 배출되는 배기가스는 총 배기가스의 80% 이상이 되고 또한, 정상적인 공연비 진단이 가능해야만 그 입력값을 받아 작동하는 다른 센서들 및 다른 구동품들은 그 기능을 할 수 있는 시간이 지연되는 문제점을 내포하고 있다.Due to this, the exhaust gas discharged at the start-up is more than 80% of the total exhaust gas, and other sensors and other driving devices that operate based on the input value have to be able to function as long as normal air-fuel ratio diagnosis is possible. This implies a delayed problem.
또한, 산소센서의 고장으로 인해 정상 공연비 제어를 할 수 없을 경우에도, 다른 센서들의 기능이 제한적일 수밖에 없어 엔진의 최적 조건을 만들 수 없는 문제점을 내포하고 있다.In addition, even when the normal air-fuel ratio control is not possible due to the failure of the oxygen sensor, there is a problem that can not make the optimum conditions of the engine because the functions of the other sensors are limited.
따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로, 엘피아이 엔진의 냉시동시 O2센서가 활성화되기 전 까지의 공백구간에서 인젝터와 맵 센서를 통해 얻어진 공연비 정보를 갖고 임시적으로 엔진의 동작을 제어함과 동시에 O2센서 고장 발생시 정상 공연비 제어가 가능하도록 제어할 수 있는 엘피아이 차량의 공연비 제어 방법을 제공하기 위한 것이다.Therefore, as to an object of the present invention solve the above problems, LP has an air-fuel ratio information obtained through the injector and the map sensor in the space period of the children and before the engine naengsi simultaneous O 2 sensor is activated, the provisionally engine operation To control the air and at the same time O 2 sensor failure occurs to control the normal air-fuel ratio to provide an air-fuel ratio control method of the vehicle.
상기한 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,
차량이 시동되면 사용하는 모든 변수를 초기화하고, O2센서의 측정값이 활성화 온도 이하인가를 판단하는 단계와;Initializing all variables used when the vehicle is started and determining whether the measured value of the O 2 sensor is equal to or less than an activation temperature;
상기 단계에서 O2센서 측정값이 활성화 온도 이하임이 판단되면, 해당하는 공연비 제어신호를 출력하는 단계로 이루어지는 것을 특징으로 한다.If it is determined in the step that the O 2 sensor measured value is less than the activation temperature, it characterized in that the step of outputting a corresponding air-fuel ratio control signal.
도 1은 본 발명에 따른 엘피아이 차량의 공연비 제어 장치 구성 블록도 이고,1 is a block diagram of an air-fuel ratio control apparatus for an Elpia vehicle according to the present invention;
도 2는 본 발명에 적용되는 엘피아이 차량의 공연비 제어 방법 동작 순서도 이고,2 is a flow chart of the air-fuel ratio control method of the Elpia vehicle applied to the present invention,
도 3은 본 발명에 따른 엘피아이 차량의 인젝터 열림 특성곡선 그래프이다.Figure 3 is a graph of the injector opening characteristic curve of the Elpia vehicle according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
100 : 차량 동작상태 검출수단 110 : 엔진 회전수 검출부100: vehicle operating state detection means 110: engine speed detection unit
120 : O2검출부 130 : 흡기 유량 검출부120: O 2 detection unit 130: intake air flow detection unit
140 : 연료 분사량 검출부 200 : 엔진 제어 장치140: fuel injection amount detection unit 200: engine control device
300 : 구동장치300: drive device
이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 따른 엘피아이 차량의 공연비 제어장치 구성 블록도 이고, 도 2는 본 발명에 적용되는 엘피아이 차량의 공연비 제어 방법 동작 순서도 이고, 도 3은 본 발명에 따른 엘피아이 차량의 공연비 제어 그래프이다.1 is a block diagram of an air-fuel ratio control apparatus for an Elpiai vehicle according to the present invention, FIG. 2 is a flowchart illustrating a method for controlling an air-fuel ratio of an Elpiai vehicle applied to the present invention, and FIG. 3 is an air-fuel ratio of an Elpiai vehicle according to the present invention. Control graph.
도 1에 도시되어 있는 바와 같이 본 발명에 따른 엘피아이 차량의 공연비 제어 장치에서 차량 동작상태 검출장치(100)는 차량의 동작상태 변화에 따라 가변되는 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 검출한다.As shown in FIG. 1, in the air-fuel ratio control apparatus for an Elpia vehicle according to the present invention, the vehicle operating state detection apparatus 100 may vary the engine speed, O 2 , intake flow rate, and fuel injection amount that vary according to a change in the operating state of the vehicle. And the like.
엔진 제어 장치(200)는 상기 차량 동작상태 검출 장치(100)에서 검출되는 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 입력받아, O2센서의 온도가 활성화 온도 이상이면, O2센서 고장여부를 판단하고, 상기 O2센서의 온도가 활성화 온도 이하이거나 또는 O2센서가 정상 동작상태이면 입력되는 흡기 유량 및 인젝터의 연료 분사시간 및 분사량 등에 따라 공연비를 연산한 후, 엔진의 공연비를 제어하기 위한 소정의 공연비 제어신호를 출력한다.The engine control device 200 receives the engine speed, O 2 , intake flow rate and fuel injection amount detected by the vehicle operation state detecting device 100, and the O 2 sensor when the temperature of the O 2 sensor is equal to or higher than the activation temperature. If the temperature of the O 2 sensor is lower than the activation temperature or the O 2 sensor is in a normal operating state, the air-fuel ratio is calculated according to the input intake flow rate, the fuel injection time and the injection amount of the injector, and the air-fuel ratio of the engine is determined. A predetermined air-fuel ratio control signal for controlling is output.
구동장치(300)는 상기 엔진 제어 장치(200)에서 출력되는 소정의 공연비 제어신호에 동기되어 엔진의 동작상태를 제어하기 위한 동작제어를 실행한다.The driving device 300 executes operation control for controlling the operation state of the engine in synchronization with a predetermined air-fuel ratio control signal output from the engine control device 200.
상기에서 차량 동작상태 검출장치(100)는 차량의 동작상태 변화에 따라 가변되는 엔진의 회전수 변화를 검출하는 엔진 회전수 검출부(110)와;The vehicle operating state detecting apparatus 100 includes an engine speed detecting unit 110 for detecting a change in rotational speed of an engine that is changed according to a change in an operating state of a vehicle;
차량의 동작상태 변화에 따라 가변되는 배출가스에 포함된 산소량 및 온도 등을 검출하는 O2검출부(120)와;O 2 detection unit 120 for detecting the amount of oxygen and the temperature contained in the exhaust gas that is variable according to the change in the operating state of the vehicle;
차량의 동작상태 변화에 따라 가변되어 엔진으로 흡입되는 흡입 공기 유량을 검출하는 흡기 유량 검출부(130)와;An intake flow rate detection unit 130 which is variable according to a change in an operation state of the vehicle and detects an intake air flow rate sucked into the engine;
차량의 동작상태 변화에 따라 가변되어 엔진으로 분사되는 연료 분사시간 및분사량 등을 검출하는 연료 분사량 검출부(140)로 이루어져 있다.The fuel injection amount detection unit 140 is configured to detect a fuel injection time, an injection amount, and the like, which are varied according to a change in an operation state of the vehicle.
상기한 구성으로 이루어진 엘피아이 차량의 공연비 제어를 첨부한 도 2 및 도 3을 참조하여 설명한다.With reference to FIGS. 2 and 3 attached to the air-fuel ratio control of the vehicle LLP configured with the above configuration.
운전자가 엘피아이 엔진을 장착한 차량을 주행시키기 위하여 엔진을 시동시키면, 엔진 제어 장치(200)는 사용하는 모든 변수를 초기화한다(S100, S110).When the driver starts the engine in order to drive a vehicle equipped with an Elpia engine, the engine control apparatus 200 initializes all the variables used (S100 and S110).
상기에서 엔진이 시동됨에 따라, 차량 동작상태 검출장치(100)는 차량동작상태 변화에 따라 가변되는 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 검출한다.As the engine is started in the above, the vehicle operating state detection apparatus 100 detects the engine speed, O 2 , intake flow rate, fuel injection amount, and the like which vary according to the change in the vehicle operating state.
이에, 엔진 제어 장치(200)는 상기 차량 동작상태 검출장치(100)에서 검출되는 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 입력받고자 소정의 제어신호를 출력하면, 상기 차량 동작상태 검출장치(100)는 인가되는 제어신호에 동기되어 검출된 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 출력한다.Therefore, when the engine control device 200 outputs a predetermined control signal to receive the engine speed, O 2 , intake flow rate, and fuel injection amount detected by the vehicle operation state detection device 100, the vehicle operation state detection is performed. The apparatus 100 outputs the detected engine speed, O 2 , intake flow rate and fuel injection amount in synchronization with the control signal applied.
엔진 제어 장치(200)는 상기 차량 동작상태 검출장치(100)에서 인가되는 엔진 회전수, O2, 흡기 유량 및 연료 분사량 등을 입력받아, 상기 입력된 O2센서의 온도가 설정된 O2센서 활성화 온도보다 높은가를 판단한다(S120, S130).The engine control apparatus 200 is activated O 2 sensor receives the number is the engine speed is, O 2, the intake flow rate and the fuel injection amount or the like, the temperature of the input O 2 sensor set in the vehicle operating condition detecting device 100 It is determined whether it is higher than the temperature (S120, S130).
상기에서 입력된 O2센서의 온도가 설정된 O2센서 활성화 온도보다 높다고 판단되면, 엔진 제어 장치(200)는 O2센서 고장여부를 판단한다(S140).If it is determined that the temperature of the input O 2 sensor is higher than the set O 2 sensor activation temperature, the engine control device 200 determines whether the O 2 sensor failure (S140).
상기에서 O2센서의 고장이 판단되면, 엔진 제어 장치(200)는 흡기 유량과 인젝터에 의해 분사되는 연료의 분사시간 및 분사량 등을 입력받아 메모리에 설정된 공연비 연산식에 의해 연산하여 도 3에 도시되어 있는 바와 같이 냉시동시 연료량 제어를 위한 인젝터의 열림 시간과 연료 분사량 제어신호를 출력한다(S150,S160,S170).When the failure of the O 2 sensor is determined in the above, the engine control apparatus 200 receives the intake flow rate and the injection time and injection amount of the fuel injected by the injector, and calculates the result by the air-fuel ratio calculation formula set in the memory, as shown in FIG. 3. As described above, the injector opening time and the fuel injection amount control signal are output during the cold start (S150, S160, S170).
즉, 엘피아이 차량에서는 연료를 고압으로 분사시키기 위해 엘피지 차량 믹서의 솔레노이드 시스템과는 다르게 인젝터가 사용되어 엔진 제어 장치(200)에서는 흡기 유량(MAF)에서 검출된 공기 유량에 대한 이론 공연비에 맞게 연료를 공급한다.That is, in the Elpia vehicle, an injector is used to inject the fuel at a high pressure, unlike the solenoid system of the Elpigie vehicle mixer. To supply.
하지만, 상기(S130)에서 입력된 O2센서의 온도가 설정된 O2센서 활성화 온도보다 낮은 경우, 엔진 제어 장치(200)는 흡입되는 흡기 유량과 인젝터의 연료 분사시간 및 분사량 등을 바로 입력받아 이론 공연비에 맞는 연료량 제어를 수행한다.However, if the temperature of the O 2 sensor input in the above (S130) is lower than the set O 2 sensor activation temperature, the engine control device 200 directly receives the intake air flow rate and the fuel injection time and injection amount of the injector The fuel amount control according to the air-fuel ratio is performed.
이로써, O2센서가 활성화되기까지 시동시 흡기유량 센서와 인젝터 분사량을 이용하여 공연비 제어를 실행함으로써, 엔진 운전 조건을 최대한 빨리 유지시키도록 각종 센서에게 공연비 정보를 주어 배기가스의 대부분을 차지하는 시동초기 배기가스 배출을 줄일 수 있고, O2센서의 고장 시에도 정상 공연비 제어가 가능하다.As a result, the air-fuel ratio control is performed using the intake air flow sensor and the injector injection amount at startup until the O 2 sensor is activated, thereby giving various sensors air-fuel ratio information so as to maintain engine operating conditions as soon as possible. Emissions can be reduced, and normal air-fuel ratio control is possible even when the O 2 sensor fails.
이상 설명한 바와 같이 본 발명은 엘피아이 엔진의 냉시동시 O2센서가 활성화되기 전 까지의 공백구간에서 인젝터와 맵 센서를 통해 얻어진 공연비 정보를 갖고 임시적으로 엔진의 동작을 제어함과 동시에 O2센서 고장 발생시 정상 공연비 제어가 가능하도록 제어함으로써, 냉시동시 인젝터와 맵 센서를 이용한 정상 공연비 진단이 가능하여, 시동초기 배기가스 배출을 저감할 수 있고, O2센서의 고장 시에도 정상 공연비 제어가 가능하다.The present invention as described above has an air-fuel ratio information obtained through the injector and the map sensor in a space period of up before naengsi simultaneous O 2 sensor is activated, the long play child engine temporarily controls the operation of the engine and at the same time, O 2 sensor failure By controlling the control of the normal air-fuel ratio at the time of occurrence, it is possible to diagnose the normal air-fuel ratio using the injector and the map sensor during cold start, thereby reducing the initial emission of the start-up gas, and it is possible to control the normal air-fuel ratio even when the O 2 sensor fails.
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| US4466410A (en) * | 1981-07-15 | 1984-08-21 | Nippondenso Co., Ltd. | Air-fuel ratio control for internal combustion engine |
| JPS6338656A (en) * | 1986-08-05 | 1988-02-19 | Nissan Motor Co Ltd | Air-fuel ratio control device for internal combustion engine |
| KR950008944A (en) * | 1993-09-17 | 1995-04-19 | 전성원 | Automotive fuel control method |
| KR19980045050A (en) * | 1996-12-09 | 1998-09-15 | 김영귀 | Air-fuel ratio control method of automotive feedback vaporizer |
| KR19980056751A (en) * | 1996-12-30 | 1998-09-25 | 박병재 | Air-fuel ratio feedback control method |
| KR20010044987A (en) * | 1999-11-01 | 2001-06-05 | 류정열 | Method for feedback controlling air-fuel ratio using O2 sensor for a vehicle |
| KR20010103994A (en) * | 2000-05-12 | 2001-11-24 | 이계안 | Exhaust gas reduction method using o2 sensor level conversion |
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| US4466410A (en) * | 1981-07-15 | 1984-08-21 | Nippondenso Co., Ltd. | Air-fuel ratio control for internal combustion engine |
| JPS6338656A (en) * | 1986-08-05 | 1988-02-19 | Nissan Motor Co Ltd | Air-fuel ratio control device for internal combustion engine |
| KR950008944A (en) * | 1993-09-17 | 1995-04-19 | 전성원 | Automotive fuel control method |
| KR19980045050A (en) * | 1996-12-09 | 1998-09-15 | 김영귀 | Air-fuel ratio control method of automotive feedback vaporizer |
| KR19980056751A (en) * | 1996-12-30 | 1998-09-25 | 박병재 | Air-fuel ratio feedback control method |
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| KR20010103994A (en) * | 2000-05-12 | 2001-11-24 | 이계안 | Exhaust gas reduction method using o2 sensor level conversion |
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