KR100297847B1 - Method for compensating air fuel ratio - Google Patents
Method for compensating air fuel ratio Download PDFInfo
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- KR100297847B1 KR100297847B1 KR1019960075038A KR19960075038A KR100297847B1 KR 100297847 B1 KR100297847 B1 KR 100297847B1 KR 1019960075038 A KR1019960075038 A KR 1019960075038A KR 19960075038 A KR19960075038 A KR 19960075038A KR 100297847 B1 KR100297847 B1 KR 100297847B1
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- load
- initial
- load value
- 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
- F02D41/02—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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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
Description
본 발명은 가속 주행시 유해 배기가스인 탄화수소의 배출량이 저감되도록 하는 공연비 보정방법에 대한 것이다.The present invention relates to an air-fuel ratio correction method for reducing emissions of hydrocarbons, which are harmful exhaust gases during acceleration driving.
차량이 주행시 엔진 제어는 다양한 신호에 의해서 수행이 되는바 현재는 흡입 공기량 및 엔진 냉각수온과 같은 신호를 체크하여 기관의 운전 상태에 따라 전자 제어 장치(ELECTRONIC CONTROL UNIT, 이하 ECU로 약칭함)가 최적의 연소력으로 엔진이 구동될 수 있도록 하고 있다.Engine control is carried out by various signals when the vehicle is running. Currently, the electronic control unit (hereinafter abbreviated as ECU) is optimal according to the engine operating condition by checking signals such as intake air volume and engine coolant temperature. The engine is driven by the combustion power of.
상기한 엔진 구동시 출력에 직접적으로 영향을 주게 되는 것은 공기와 연료의 혼합비인 공연비인바 이같은 공연비를 차량의 구동상태에 따라서 적절히 제어되도록 하는 것이 엔진 제어에서 가장 중요하다.It is the most important in the engine control that the air-fuel ratio, which is a mixture ratio of air and fuel, to be directly controlled according to the driving state of the vehicle, which directly affects the output when driving the engine.
한편 상기와 같은 제어시 부하가 증대되면서 엔진 회전수가 상승하게 되면 ECU에서는 이를 전부하(Full Load)상태라 판단하며, 이때 공연비는 연료를 기존 매핑값보다는 약 10% 가량을 증량시켜 리치하게 설정 제어되도록 하므로서 가속성을 증대시키도록 하고 있다.On the other hand, when the engine speed increases as the load increases during the above control, the ECU determines that this is a full load state, and the air-fuel ratio is increased by about 10% of the fuel than the existing mapping value, and is set and controlled richly. In order to increase the acceleration.
하지만 상기와 같은 가속 주행시 연료의 증량에 따라 엔진에서는 다량의 유해한 배기가스를 배출시키게 되는데 이같은 연료 증량으로 연료 대비 공기량 부족 현상이 발생되면서 일산화탄소(CO) 및 탄화수소(HC)와 같은 유해한 배기가스를 다량으로 배출시키게 되는 것이다.However, the engine emits a large amount of harmful exhaust gas according to the increase of fuel during the acceleration driving as described above. As the increase of fuel causes a shortage of air compared to the fuel, a large amount of harmful exhaust gas such as carbon monoxide (CO) and hydrocarbon (HC) is generated. Will be discharged.
이중 탄화수소(HC)는 특히 질소산화물(NOX)과 함께 광화학 스모그를 발생시키게 되는 원인이 되고 있는바 이는 대기 오염을 더욱 악화시키게 되는 문제점이 있게 된다.The double hydrocarbon (HC), in particular, causes photochemical smog together with the nitrogen oxide (NO X ), which causes a problem of worsening air pollution.
이에 본 발명은 상기한 문제점을 감안하여 이를 개선시키기 위한 것으로서, 본 발명은 가속 주행시의 공연비 제어에서 흡입되는 공기량을 일정 시간동안 체크하여 이들의 변화량을 적분한 평균값에 따른 보정 매핑값과 초기 매핑값간 편차를 검출한 후 이때의 편차가 기설정치보다 크게 체크되면 초기 매핑값을 초기 매핑값에 대한 보정 매핑값의 변화비율만큼 보정될 수 있도록 하므로서 부하 상승률에 따라 구배저항에 적절한 공연비 보정으로 미연소가스인 탄화수소의 배출량을 보다 저감시켜 에미션이 개선될 수 있도록 하는 것이다.Accordingly, the present invention has been made in view of the above-described problems, and the present invention is to check the amount of air sucked in the air-fuel ratio control during acceleration driving for a predetermined time, and between the corrected mapping value and the initial mapping value according to the average value integrating these changes. If the deviation is checked after the deviation is larger than the preset value, the initial mapping value can be corrected by the rate of change of the correction mapping value to the initial mapping value. The emission of phosphorus hydrocarbons can be further reduced so that the emission can be improved.
상기한 목적을 달성시키기 위하여 본 발명은 주행 중 엔진 부하가 상승시 엔진 회전수가 상승하는지를 판단하는 단계와; 엔진 회전수가 상승될 때의 초기 부하값을 검출하는 단계와; 일정 시간 동안의 부하 변동값을 체크하여 적분하는 단계와; 상기 단계에서 적분한 부하의 평균값을 검출하는 단계와; 상기 단계에서 검출된 평균값과 초기 부하값간 편차가 기설정된 부하값보다 큰지를 판단하는 단계와; 상기 단계에서 기설정 부하값보다 크면 초기 부하값을 부하 변동률만큼 조정하여 매핑 제어하고, 기설정 부하값보다 작으면 초기 부하값에 의해 매핑 제어토록 하는 단계로서 수행되도록 하는 것이 특징이다.In order to achieve the above object, the present invention includes the steps of determining whether the engine speed increases when the engine load rises while driving; Detecting an initial load value when the engine speed is increased; Checking and integrating the load change value for a predetermined time; Detecting an average value of the load integrated in the step; Determining whether a deviation between the average value detected in the step and the initial load value is greater than a preset load value; In this step, when the load value is greater than the preset load value, the initial load value is adjusted by the load variation rate, and the mapping control is performed. When the load value is smaller than the preset load value, the mapping control is performed by the initial load value.
제1도는 주행시의 부하와 엔진 회전수간 관계선도.1 is a relationship diagram between load and engine speed during driving.
제2도는 본 발명에 따른 제어 흐름도.2 is a control flowchart according to the present invention.
이를 첨부한 실시예 도면을 참조하여 보다 상세하게 설명하면 다음과 같다.This will be described in more detail with reference to the accompanying drawings.
도 1 은 본 발명에 따른 부하와 엔진 회전수간 관계를 도시한 것으로서, 본 발명은 부하가 상승되는 동시에 엔진 회전수가 상승되는 구간에서의 연료 보정 방법에 대한 것이다.1 illustrates a relationship between a load and an engine speed according to the present invention. The present invention relates to a fuel correction method in a section in which an engine speed is increased while a load is increased.
즉 도 2 에서와 같이 차량이 주행 중 부하가 상승되면서 엔진 회전수가 상승하게 되면(S1) ECU에서는 이를 전부하상태라 판단하게 된다.That is, as shown in FIG. 2, when the engine speed is increased while the load is increased while driving (S1), the ECU determines that the vehicle is at full load.
이때 ECU에서는 초기 부하값(TL1)을 검출한 후(S2) 다시 일정 시간(Δ T) 동안의 부하 변동값을 체크하고 이를 적분한다(S3).At this time, the ECU detects the initial load value TL1 (S2) and checks the load variation value for a predetermined time ΔT again and integrates it (S3).
이렇게 적분한 부하의 평균값(TL2)을 검출하여(S4) 초기 부하값(TL1)과의 편차를 구하면서 이때의 편차가 ECU에 입력된 기설정값(δ)보다 큰지를 비교 판단한다(S5).Thus, the average value TL2 of the integrated load is detected (S4), and the deviation from the initial load value TL1 is calculated, and the comparison is judged whether the deviation is larger than the preset value δ input to the ECU (S5). .
상기의 단계(S5)에서 편차가 ECU에 입력된 기설정값(δ)보다 크다고 판단되면 이는 초기 부하값(TL1)*초기 부하값(TL1)/평균값(TL2)로서 부하값을 산출하여 매핑값에 따라 연료 분사량을 제어하고(S6), 편차가 ECU에 입력된 기설정값(δ)보다 작다고 판단되면 바로 초기 부하값(TL1)에 의해 연료 분사량이 제어되도록 한다(S7).If it is determined in step S5 that the deviation is larger than the preset value δ input to the ECU, the load value is calculated as the initial load value TL1 * initial load value TL1 / average value TL2 and the mapping value is calculated. The fuel injection amount is controlled according to (S6), and if it is determined that the deviation is smaller than the preset value (δ) input to the ECU, the fuel injection amount is controlled immediately by the initial load value TL1 (S7).
상기와 같은 제어에 의해 기존에는 주행 중 운전 상태가 전부하로 판단되면 무조건 초기 부하값에 약 10%를 증량시켜 연료를 공급하게 되던 것을 부하값의 변동이 작을 때는 적은량으로, 부하값의 변동이 클 때는 보다 많은량으로 연료가 증량되도록 하므로서 공연비 제어를 더욱 정밀하면서 효율적으로 수행시킬 수가 있게 된다.Under the control as described above, when the driving state during the driving is determined to be full load, the fuel is supplied unconditionally by increasing the initial load value by about 10%. When the load value is small, the load value is large. By increasing the amount of fuel in more time, the air-fuel ratio control can be performed more precisely and efficiently.
그러므로 본 발명에 따라 전부하로 운전시 연료 공급을 보다 효율적으로 증량시키게 되므로서 연료의 불필요한 소모를 방지시킬 수가 있게 되는 동시에 공기량에 대한 연료량 증가로 발생되는 미연소 배기가스의 배출량을 최대한 저감시킬 수가 있게 되어 경제적인 연비와 국제적인 배출가스 규제 법규의 만족 및 대기 오염 방지에 대단히 기여하게 되는 매우 유용한 효과를 제공할 수가 있게 되는 것이다.Therefore, according to the present invention, the fuel supply can be increased more efficiently when operating at full load, thereby preventing unnecessary consumption of fuel and at the same time reducing the amount of unburned exhaust gas generated by increasing the amount of fuel relative to the amount of air. This will provide a very useful effect that will contribute greatly to the economical fuel economy, the satisfaction of international emission regulations and the prevention of air pollution.
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KR1019960075038A KR100297847B1 (en) | 1996-12-28 | 1996-12-28 | Method for compensating air fuel ratio |
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KR1019960075038A KR100297847B1 (en) | 1996-12-28 | 1996-12-28 | Method for compensating air fuel ratio |
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KR100297847B1 true KR100297847B1 (en) | 2001-11-22 |
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