KR19980055808A - How to correct the air-fuel ratio during climbing - Google Patents

How to correct the air-fuel ratio during climbing Download PDF

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KR19980055808A
KR19980055808A KR1019960075044A KR19960075044A KR19980055808A KR 19980055808 A KR19980055808 A KR 19980055808A KR 1019960075044 A KR1019960075044 A KR 1019960075044A KR 19960075044 A KR19960075044 A KR 19960075044A KR 19980055808 A KR19980055808 A KR 19980055808A
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South Korea
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mapping value
vehicle speed
value
correction
load
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KR1019960075044A
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Korean (ko)
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KR100294347B1 (en
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이태표
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박병재
현대자동차 주식회사
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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

본 발명은 등판 주행시 초기 부하와 차속에 따른 초기 매핑값을 일정시간 동안의 부하와 차속 변화량의 평균값에 의한 보정 매핑값에 따라 연료 분사량이 가변분사되도록 하므로서 구배저항에 적절한 공연비 보정으로 미연소가스인 탄화수소의 배출량을 보다 저감시켜 에미션이 개선될 수 있도록 하는 등판 주행시의 공연비 보정방법에 대한 것으로서, 상기한 목적을 달성시키기 위하여 본 발명은 주행 중 엔진 부하(TL)가 상승시 차속(VS)이 하강되는지를 판단하는 단계와(S1); 상기 단계에서의 엔진 부하(TL)와 차속(VS)에 따른 초기 매핑값(TF1)을 검출하는 단계와(S2)와; 일정시간(ΔT) 동안의 엔진 부하(TH)와 차속(VS)을 체크하여 이들의 평균값(TLA)(VSA)을 검출하는 단계와(S3); 상기 단계에서 검출된 평균값(TLA)(VSA)에 의한 보정 매핑값(FF2)을 검출하는 단계와(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)로서 수행되도록 하는 것이 특징이다.The present invention allows the fuel injection amount to be variably sprayed according to the correction mapping value by the average value of the load and vehicle speed change for a predetermined time, the initial mapping value according to the initial load and the vehicle speed during the climbing run is unburned gas by correction of the air-fuel ratio suitable for the gradient resistance. The present invention relates to a method for correcting air-fuel ratio during climbing while reducing emissions of hydrocarbons so that the emission can be improved. To achieve the above object, the present invention provides a vehicle speed (V S ) when the engine load (TL) rises while driving. Determining whether it is lowered (S1); Detecting an initial mapping value (T F1 ) according to the engine load (TL) and the vehicle speed (V S ) in the step (S2); Detecting an average value thereof (TL A) (V SA) is checked for a predetermined time (ΔT) engine load (TH) and the vehicle speed (V S) for the (S3); Detecting a correction mapping value (F F2 ) by the mean value (TL A ) (V SA ) detected in the step (S4); 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 . To be performed as

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 ECU 약칭함)가 정확히 체크하여 최적의 연소력으로 구동될 수 있도록 하고 있다.When the vehicle is running, the engine accurately checks the engine's operating state 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 매핑값 보다는 약 10% 가량을 증량시켜 리치하게 설정 제어되도록 하므로서 등판 가속성을 증대시키도록 하고 있다.On the other hand, when the load increases during the control as described above, when the vehicle speed decreases, the ECU judges this as a climbing running state, and the air-fuel ratio is increased by about 10% of the fuel rather than the existing mapping value so that the climbing is controlled in a rich setting. To increase the acceleration.

하지만 상기와 같은 등판 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 되곤 한다.However, according to the increase in fuel, the engine emits a large amount of harmful exhaust gas during the climbing run. As such an increase in 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 있으며, 이는 대기 오염을 더욱 악화시키게 되는 문제점이 있게 된다.The double hydrocarbon (HC) is a cause of generating photochemical smog, especially with nitrogen oxides (NO X ), which has a problem that worsens 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 발명은 주행 중 엔진 부하가 상승시 차속이 하강하는지를 판단하는 단계와; 상기 단계에서의 엔진 부하와 차속에 따라 초기 매핑값을 검출하는 단계와; 일정시간 동안의 엔진 부하와 차속을 체크하여 이들의 평균값을 검출하는 단계와; 상기 단계에서 검출된 평균값에 의한 보정 매핑값을 검출하는 단계와; 상기한 단계에서 검출된 초기 매핑값에 상기한 초기 매핑값에 대한 보정 매핑값의 비율만큼을 더하여 최종 매핑값을 산출하는 단계로서 수행되도록 하는 것이 특징이다.In order to achieve the above object, the present invention includes the steps of determining whether the vehicle speed is lowered when the engine load rises while driving; Detecting an initial mapping value according to the engine load and the vehicle speed in the step; Checking the engine load and the vehicle speed for a predetermined time and detecting their average values; Detecting a correction mapping value by the mean value detected in the step; 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.

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

도 2는 본 발명에 따른 제어 흐름도2 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 1은 본 발명에 따른 부하와 차속간 관계를 도시한 것으로서, 일반적으로는 부하(TL)가 상승시 차속(VS)도 동시에 빨라지게 되며, 부하(TL)가 저하되면 차속(VS)도 감속된다. 이러한 차량 주행시 특별히 부하(TL)는 상승하게 되는데 비해 반대로 차속(VS)은 감속이 되는 경우가 있는바 이는 차량 주행시 저항의 강한 영향을 받고 있다는 것을 의미하게 된다.1 is a view illustrating a relationship between a load and a vehicle speed according to the present invention. In general, when the load TL rises, the vehicle speed V S also becomes faster, and when the load TL decreases, the vehicle speed V S occurs. Is also slowed down. In particular, when the vehicle travels, the load TL is increased, whereas the vehicle speed V S is decelerated, which means that the vehicle is strongly influenced by the resistance.

이같은 주행 상태를 ECU에서는 등판 주행상태로서 인식을 하게 되는바 감속되는 차속을 보상하기 위해 연료의 공급을 증량시키게 된다.This driving condition is recognized by the ECU as the 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 the fuel supply is first made to increase the load TL while the vehicle is running, whereas when the vehicle speed V S is decelerated, the control mode in the ECU is switched (S1).

ECU에서는 이때의 부하(TL)와 차속(VS)에 의한 초기 매핑값(TF1)을 검출한 후(S2), 다시 일정시간(ΔT) 동안의 부하와 차속 변동값을 체크하여 이들의 평균값(TLA)(VSA)을 산출한다(S3).The ECU detects the initial mapping value T F1 according to the load TL and the vehicle speed V S at this time (S2), and then checks the load and vehicle speed fluctuation values for a predetermined time ΔT again, and averages these values. (TL A ) (V SA ) 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.A load (TL) and the vehicle speed by the average value (TL A) (V SA) of (V S) correction map value (T F2) to detect and (S4), the initial mapping value calculated at step (S3) of the (T F1 ) and the correction mapping value (T F2 ) detect the final mapping value (T F3 ) by the equation initial mapping value (T F1 ) + (calibration 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 패핑값(TF2)에 의해 연료 증량폭이 결정되도록 하므로서 등판 저항이 심할 때에 비해 구배 저항이 적은 주행시의 연료 증량이 적어지도록 하므로서 공연비 제어를 더욱 정밀하면서 효율적으로 수행시킬 수가 있도록 한다.Therefore, in the past, if the driving condition during driving was determined to be climbing, the average value of the change in the load (TL) and the vehicle speed (V S ) for a predetermined time (ΔT) was increased. More accurate air-fuel ratio control by allowing the fuel increase width to be determined by the corrected padding value (T F2 ) by (TL A ) (V SA ), thereby reducing the amount of fuel increase when driving with less gradient resistance than when the back resistance is severe It can be done efficiently.

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 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, 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 will provide a very useful effect that will contribute greatly to economic fuel economy, the satisfaction of international emission regulations and the prevention of air pollution.

Claims (1)

주행 중 엔진 부하(TL)가 상승시 차속(VS)이 하강되는지를 판단하는 단계와(S1);Determining whether the vehicle speed V S falls when the engine load TL rises while driving (S1); 상기 단계에서의 엔진 부하(TL)와 차속(VS)에 따른 초기 매핑값(TF1)을 검출하는 단계와(S2)와;Detecting an initial mapping value (T F1 ) according to the engine load (TL) and the vehicle speed (V S ) in the step (S2); 일정시간(ΔT) 동안의 엔진 부하(TH)와 차속(VS)을 체크하여 이들의 평균값(TLA)(VSA)을 검출하는 단계와(S3);Detecting an average value thereof (TL A) (V SA) is checked for a predetermined time (ΔT) engine load (TH) and the vehicle speed (V S) for the (S3); 상기 단계에서 검출된 평균값(TLA)(VSA)에 의한 보정 매핑값(FF2)을 검출하는 단계와(S4);Detecting a correction mapping value (F F2 ) by the mean value (TL A ) (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 등판 주행시의 공연비 보정방법.An air-fuel ratio correction method during climbing run, 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 KR100294347B1 (en) 2001-09-17

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