KR100294347B1 - Method for compensating for air/fuel ratio when travelling inclined road - Google Patents

Method for compensating for air/fuel ratio when travelling inclined road Download PDF

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KR100294347B1
KR100294347B1 KR1019960075044A KR19960075044A KR100294347B1 KR 100294347 B1 KR100294347 B1 KR 100294347B1 KR 1019960075044 A KR1019960075044 A KR 1019960075044A KR 19960075044 A KR19960075044 A KR 19960075044A KR 100294347 B1 KR100294347 B1 KR 100294347B1
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mapping value
air
vehicle speed
vehicle
fuel ratio
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KR1019960075044A
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Korean (ko)
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KR19980055808A (en
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이태표
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이계안
현대자동차주식회사
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed

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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

PURPOSE: A method for compensating for an air/fuel ratio when travelling an inclined road is provided to improve an emission characteristic by reducing an amount of unburned gas through compensating for the air/fuel ratio. CONSTITUTION: When an engine load is increased during travelling, it is determined whether the velocity of a vehicle is decreased. If the vehicle velocity is decreased, it is determined that the vehicle runs along an inclined road(S1). Then, an initial mapping value according to the engine load and vehicle velocity is detected(S2). The engine load and vehicle velocity are checked for a predetermined time, so as to detect a mean value thereof(S3). The compensated mapping value based on the mean value is detected(S4). Then, a final mapping value is calculated by proportionally adding the compensated mapping valve to the initial mapping value(S5).

Description

등판 주행시의 공연비 보정방법How to correct the air-fuel ratio during climbing

본 발명은 경사길을 등판 주행시 유해 배기가스인 탄화수소의 배출량이 저감될 수 있도록 하는 등판 주행시의 공연비 보정방법에 대한 것이다.The present invention relates to an air-fuel ratio correction method for climbing driving so that the emissions of hydrocarbons, which are harmful exhaust gases, can be reduced during climbing the slope.

차량이 주행시 엔진은 흡입 공기량 및 엔진 냉각수온과 같은 다양한 신호에 의해 기관의 운전 상태를 전자 제어 장치(ELECTRONIC CONTROL UNIT 이하 ECU로 약칭함)가 정확히 체크하여 최적의 연소력으로 구동될 수 있도록 하고 있다.When the vehicle is running, the engine accurately checks the engine's operating status by various signals such as intake air amount and engine coolant temperature so that the engine can be driven with optimum combustion power. .

이러한 엔진 구동시의 출력에 직접적으로 영향을 주게 되는 것이 공기와 연료의 혼합비인 공연비인바 이같은 공연비를 차량의 구동상태에 따라서 적절히 제어되도록 하는 것이 가장 중요하다.It is most important that the air-fuel ratio, which is a mixture ratio of air and fuel, is directly controlled according to the driving state of the vehicle, which directly affects the output when the engine is driven.

한편 상기와 같은 제어시 부하가 상승되는데 비해 차속이 느려지게 되면 ECU에서는 이를 등판 주행상태로서 판단하게 되며, 이때 공연비는 연료를 기존 매핑값보다는 약 10% 가량을 증량시켜 리치하게 설정 제어되도록 하므로서 등판 가속성을 증대시키도록 하고 있다.On the other hand, if the load increases during the above control, but the vehicle speed decreases, the ECU judges this as the climbing running state, and the air-fuel ratio is increased by about 10% of the fuel than the existing mapping value so that it is richly set and controlled. To increase the acceleration.

하지만 상기와 같은 등판 주행시 연료의 증량에 따라 엔진에서는 대량의 유해한 배기가스를 배출시키게 되는데 이같은 연료 증량으로 연료 대비 공기량 부족현상이 발생되면서 일산화탄소(CO) 및 탄화수소(HC)와 같은 유해한 배기가스를 다량으로 배출시키게 되곤 한다.However, according to the increase in fuel, the engine emits a large amount of harmful exhaust gas during the climbing run as described above. Will be discharged.

이중 탄화수소(HC)는 특히 질소산화물(NOX)과 함께 광화학 스모그를 발생시키게 되는 원인이 되고 있으며, 이는 대기 오염을 더욱 악화시키게 되는 문제점이 있게 되다.The double hydrocarbon (HC) is a cause of generating photochemical smog, in particular with the nitrogen oxide (NO X ), which has a problem that worsens the air pollution.

이에 본 발명은 상기한 문제점을 감안하여 이를 개선시키기 위한 것으로서, 본 발명은 등판 주행시 초기 부하와 차속에 따른 초기 매핑값을 일정시간 동안의 부하와 차속 변화량의 평균값에 의한 보정 매핑값에 따라 연료 분사량이 가변 분사되도록 하므로서 구배저항에 적절한 공연비 보정으로 미연소가스인 탄화수소의 배출량을 보다 저감시켜 에미션이 개선될 수 있도록 하는데 목적이 있다.Accordingly, the present invention has been made in view of the above-described problems, and the present invention provides an initial mapping value according to the initial load and the vehicle speed during climbing, and according to the correction mapping value by the average value of the load and vehicle speed change for a predetermined time. This variable injection is intended to improve the emission by further reducing the emission of hydrocarbons, which are unburned gas, by adjusting the air-fuel ratio appropriate for the gradient resistance.

상기한 목적을 달성시키기 위하여 본 발명은The present invention to achieve the above object

주해 중 엔진 부하가 상승시 차속이 하강하는지를 판단하고, 이 판단결과 부하가 상승할때 차속이 하강하면 차량이 경사로를 등판하는 것으로 판단하는 단계와;Determining whether the vehicle speed decreases when the engine load rises during the main comment, and determining that the vehicle climbs the slope when the vehicle speed decreases when the load increases as a result of the determination;

상기 단계에서의 엔진 부하와 차속에 따른 초기 매핑값을 검출하는 단계와;Detecting an initial mapping value according to the engine load and the vehicle speed in the step;

일정시간 동안의 엔진 부하와 차속을 체크하여 이들의 평균값을 검출하는 단계와;Checking the engine load and the vehicle speed for a predetermined time and detecting their average values;

상기 단계에서 검출된 평균값에 의한 보정 매핑값을 검출하는 단계와;Detecting a correction mapping value by the mean value detected in the step;

상기한 단계에서 검출된 초기 매핑값에 상기한 초기 매핑값에 대한 보정 매핑값의 비율만큼을 더하여 최종 매핑값을 산출하는 단계로서 수행되도록 하는 것이 특징이다.The method may be performed as a step of calculating the final mapping value by adding the ratio of the correction mapping value to the initial mapping value to the initial mapping value detected in the above step.

제 1 도는 주행시의 부하와 차속간 관계선도1 is a relationship diagram between load and vehicle speed during driving

제 2 도는 본 발명에 따른 제어 흐름도2 is a control flow diagram according to the present invention

이를 첨보한 실시예 도면을 참조하여 보다 상세하게 설명하면 다음과 같다.When described in more detail with reference to the accompanying drawings the embodiment as follows.

도 1은 본 발명에 따른 부하와 차속간 관계를 도시한 것으로서, 일반적으로 부하(TL)가 상승시 차속(Vs)도 동시에 빨라지게 되며, 부하(TL)가 저하되면 차속(Vs)도 감속된다. 이러한 차량 주행시 특별시 부하(TL)는 상승하게 되는데 비해 반대로 차속(Vs)은 감속이 되는 경우가 있는바 이는 차량 주행시 저항의 강한 영향을 (예를들면, 차량이 경사로를 등판하고 있는 경우) 받고 있다는 것을 의미하게 된다.1 illustrates a relationship between a load and a vehicle speed according to an exemplary embodiment of the present invention. In general, when the load TL rises, the vehicle speed Vs also becomes faster, and when the load TL decreases, the vehicle speed Vs also decreases. . While the vehicle load (TL) increases when driving the vehicle, the vehicle speed (Vs) may decelerate, which means that the vehicle is under the strong influence of the resistance (for example, when the vehicle is climbing the slope). Will mean.

이같은 주행 상태를 ECU에서는 등판 주행상태로서 인식을 하게 되는바 감속 되는 차속을 보상하기 위해 연료의 공급을 증량시키게 된다.This driving condition is recognized by the ECU as a climbing driving state, and the fuel supply is increased to compensate for the decelerated vehicle speed.

연료 공급의 증량은 도 2에서와 같이 우선 차량이 주행 중 부하(TL)가 상승하게 되는데 비해 차속(Vs)이 감속되면 ECU에서의 제어 모드로 전환하게 된다.(S1)As shown in FIG. 2, the increase in fuel supply is made to first change the control mode in the ECU when the vehicle speed Vs decreases while the load TL increases while the vehicle is driving.

ECU에서는 이때의 부하(TL)와 차속(Vs)에 의한 초기 매핑값(TF1)을 검출한 후(S2), 다시 일정시간(ΔT) 동안의 부하아 차속 변동값을 체크하고 이들의 평균값(TLA)(VSA)을 산출한다(S3).The ECU detects the initial mapping value T F1 by the load TL and the vehicle speed Vs at this time (S2), and then checks the load child vehicle speed fluctuation value for a predetermined time ΔT and checks the average value ( TL A ) (VS A ) is calculated (S3).

상기의 단계(S3)에서 산출된 부하(TL)와 차속(Vs)의 평균값(TLA)(VSA)에 의해 보정 매핑값(TF2)을 검출하고(S4), 상기한 초기 매핑값(TF1)과 보정 매핑값(TF2)은 식 초기 매핑값(TF1)+(보정 매핑값(TF2)/초기 매핑값(TF1))에 의해서 최종 매핑값(TF3)을 검출하여(S5) 상기한 최종 매핑값(TF3)에 따라서 연료 분사량을 조정한다.The correction mapping value T F2 is detected by the average value TL A (VS A ) of the load TL and the vehicle speed Vs calculated in the step S3 (S4), and the initial mapping value ( T F1 ) and the correction mapping value T F2 detect the final mapping value T F3 by the equation initial mapping value T F1 + (correction mapping value T F2 / initial mapping value T F1 ). (S5) The fuel injection amount is adjusted according to the final mapping value T F3 described above.

따라서 종전에는 주행 중 운전 상태가 등판 주행시로 판단되면 무조건 초기 매핑값에 약 10%를 증량시켜 연료를 공급하도록 하던 것을 일정시간(ΔT)동안의 부하(TL)와 차속(Vs)의 변화량 평균값(TLA)(VSA)에 의한 보정된 매핑값(TF2)에 의해 연료 증량폭이 결정되도록 하므로서 등판 저항이 심할 때에 비해 구배 저항이 적은 주행시의Therefore, if the driving condition during driving is determined to be on the climbing road, the average value of the change amount of the load (TL) and the vehicle speed (Vs) for a predetermined time (ΔT) has been increased. When the fuel increase width is determined by the corrected mapping value T F2 by T LA ) (V SA ),

그러므로 본 발명에 따라 등판 주행시 연료 증량 공급을 구배 저항에 따라서 보다 효율적으로 조정되도록 하므로서 연료의 불필요한 소모를 방지시킬 수가 있게 되는 동시에 공기량에 대한 연료량 증가로 발생되는 미연소 배기가스의 배출량을 최대한 저감시킬 수가 있게 되어 경제적인 연비와 국제거인 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, it is possible to prevent the unnecessary consumption of fuel by adjusting the fuel increase supply more efficiently according to the gradient resistance at the time of climbing, and at the same time reduce the amount of unburned exhaust gas generated by the increase in the fuel amount relative to the air amount. This could provide a very useful effect that would greatly contribute to the economic fuel economy, the satisfaction of international giant emission regulations and the prevention of air pollution.

Claims (1)

주행 중 엔진 부하(TL)가 상승시 차속(Vs)이 하강하는지를 판단하고, 이 판단결과 부하가 상승할때 차속이 하강하면 차량이 경사로를 등판하는 것으로 판단하는 단계와(S1);Determining whether the vehicle speed Vs falls when the engine load TL rises while driving, and determining that the vehicle climbs the slope when the vehicle speed decreases when the load rises (S1); 상기 단계에서의 엔진 부하(TL)와 차속(Vs)에 따른 초기 매핑값(TF1)을 검출하는 단계(S2)와;Detecting an initial mapping value T F1 according to the engine load TL and the vehicle speed Vs in the step S2; 일정시간(ΔT) 동안의 엔진 부하(TL)와 차속(Vs)을 체크하여 이들의 평균값(TLA)(VSA)을 검출하는 단계와(S3);Checking the engine load TL and the vehicle speed Vs for a predetermined time ΔT and detecting their average value T LA (V SA ) (S3); 상기 단계에서 검출된 평균값(TLA)(VSA)에 의한 보정 매핑값(TF2)을 검출하는 단계와(S4);Detecting a correction mapping value T F2 based on the average value T LA (V SA ) detected in the step (S4); 상기한 단계에서 검출된 초기 매핑값(TF1)에 상기한 초기 매핑값(TF1)에 대한 보정 매핑값(TF2)의 비율만큼을 더하여 최종 매핑값(TF3)을 산출하는 단계(S5);Calculating a final mapping value T F3 by adding the initial mapping value T F1 detected in the above step by the ratio of the correction mapping value T F2 to the initial mapping value T F1 . ); 로서 수행되도록 하는 것을 특징으로 하는 들판 주행시의 공연비 보정방법.Air-fuel ratio correction method when driving on the field, characterized in that to be carried out as.
KR1019960075044A 1996-12-28 1996-12-28 Method for compensating for air/fuel ratio when travelling inclined road KR100294347B1 (en)

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KR100294347B1 true KR100294347B1 (en) 2001-09-17

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