KR20030000531A - Method of controlling air fuel ratio and ignition for an engine in vehicles - Google Patents

Method of controlling air fuel ratio and ignition for an engine in vehicles Download PDF

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KR20030000531A
KR20030000531A KR1020010036556A KR20010036556A KR20030000531A KR 20030000531 A KR20030000531 A KR 20030000531A KR 1020010036556 A KR1020010036556 A KR 1020010036556A KR 20010036556 A KR20010036556 A KR 20010036556A KR 20030000531 A KR20030000531 A KR 20030000531A
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rpm
engine
fuel ratio
ignition
reference value
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KR1020010036556A
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KR100748647B1 (en
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한영석
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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
    • F02D41/04—Introducing corrections for particular operating conditions
    • 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)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A method for controlling the air-fuel ratio and ignition of a vehicle engine is provided to satisfy the exhaust regulation by controlling the air-fuel ratio and ignition, and to improve acceleration feeling by preventing the drop of output. CONSTITUTION: A method for controlling the air-fuel ratio and ignition of a vehicle engine comprises the steps of: determining whether the opening angle of a throttle is more than a predetermined value when the engine is running(S110); controlling fuel, intake air and ignition timing by applying a Wide Open Throttle(WOT) if engine rpm is within the predetermined range, the displacement numbers of throttle opening amount is more than one time and the displacement number of the throttle opening amount is more than a predetermine time; and controlling fuel, intake air and ignition timing retard by applying the WOT if the engine rpm is outside a reference value(S160).

Description

자동차 엔진의 공연비 및 점화 제어방법 {METHOD OF CONTROLLING AIR FUEL RATIO AND IGNITION FOR AN ENGINE IN VEHICLES}Air-fuel ratio and ignition control method of automobile engine {METHOD OF CONTROLLING AIR FUEL RATIO AND IGNITION FOR AN ENGINE IN VEHICLES}

본 발명은 자동차 엔진에 있어서, 공연비 및 점화 제어로 배기규제를 만족하면서도 출력 저하를 방지하여 가속감을 향상시킬 수 있도록 한 자동차 엔진의 공연비 및 점화제어방법에 관한 것이다.The present invention relates to an air-fuel ratio and ignition control method for an automobile engine, in which an emission ratio and an ignition control satisfy an exhaust regulation while preventing output degradation to improve the feeling of acceleration.

일반적으로 자동차용 엔진은, 차량의 주행상태 및 주행조건에 따라 분사되는 연료량 및 흡기량과, 점화시기 등에 의하여 제어되며, 이런 제어과정은 운전조건에 따라 각 센서들로부터 검출되는 전기적인 신호를 엔진 제어를 위한 전자제어유닛 (ECU)에 미리 입력되어진 데이터와 비교 판단하여 소정의 로직에 따라 이루어지게 된다.In general, an automobile engine is controlled by the amount of fuel injected and the intake amount according to the driving condition and the driving conditions of the vehicle, the ignition timing, and the like. The control process controls the electric signals detected from the sensors according to the driving conditions. It is made according to a predetermined logic in comparison with the data previously input to the electronic control unit (ECU) for the.

이와같은 제어를 위한 엔진 제어 시스템은 엔진을 포함하는 차량의 적소에배치된 각각의 센서들로부터 현재의 차량 운행 조건이 전기적인 신호로 검출되어 전자제어유닛(ECU, 이하 ECU로 칭함)으로 전달되면 ECU에서는 미리 설정되어 있는 제어로직에 따라 제어 구동부를 제어하여 현재 엔진 운전상태가 최적의 상태가 되도록 제어를 실시할 수 있도록 구성되어 있다.The engine control system for such a control is provided to the electronic control unit (ECU, hereinafter referred to as ECU) when the current vehicle driving condition is detected as an electric signal from each of the sensors disposed in place of the vehicle including the engine. The ECU is configured to control the control driver according to the control logic set in advance so that the control can be performed so that the current engine operating state is optimal.

이러한 일예로서, 본 발명에 관계하여 스로틀 개도와 엔진 RPM에 따른 엔진 제어과정을 살펴보면, 도 3에서와 같이, 엔진이 시동된 상태에서(S300) 스로틀 개도각이 기준값 이상인가를 판단하게 된다(S310).As one example, referring to the engine control process according to the throttle opening degree and the engine RPM in relation to the present invention, as shown in FIG. 3, it is determined whether the throttle opening angle is greater than or equal to the reference value as shown in FIG. 3 (S310). ).

상기에서 기준값은 대략 60%로 설정되며, 상기 S310 단계에서 기준값 이상이라도 판단되면, 양측으로 분기되어 엔진 RPM이 기준값 이내인가를 판단하게 되는데 (S320)(S330), 상기 S320 단계에서는 엔진 RPM이 3320RPM 이상이고 4200RPM 이하인가를 판단하고, S330 단계에서는 엔진 RPM이 3320RPM 이하 또는 4200RPM 이상인가를 판단하게 된다.The reference value is set to approximately 60%, and if it is determined even if the reference value or more in the step S310, it is branched to both sides to determine whether the engine RPM is within the reference value (S320) (S330), in the step S320, the engine RPM is 3320RPM It is determined whether the above 4200 RPM or less, and in step S330 it is determined whether the engine RPM is less than 3320 RPM or more than 4200 RPM.

상기에서의 엔진 RPM은 수동 변속기(MT)일경우의 예이고, 자동 변속기(AT)인 경우에는 S320 단계에서 엔진 RPM이 3320RPM 이상이고 5360RPM 이하인가를 판단하고, S330 단계에서는 엔진 RPM이 3320RPM 이하 또는 5360RPM 이상인가를 판단하게 된다.The engine RPM in the above is an example of the case of a manual transmission (MT), and in the case of an automatic transmission (AT), it is determined whether the engine RPM is 3320 RPM or more and 5360 RPM or less in step S320, and the engine RPM is 3320 RPM or less in step S330 or It is determined whether it is 5360 RPM or more.

그리고 상기 S320 단계에서 조건을 만족하면, 이론 공연비로 제어만 이루어질 뿐 WOT(Wide Open Throttle, 이하 WOT로 칭함)판정은 실시하지 않게 된다 (S340).If the condition is satisfied in step S320, only the control is performed based on the theoretical air-fuel ratio, and the WOT (Wide Open Throttle) is not determined (S340).

또한, 상기 S330 단계에서 조건을 만족하면 WOT 판정을 실시하여(S350) 출력동연비(A/F Enrichment)로 연료를 증가시키고, 점화시기 지각이 이루어지게 된다(S360).In addition, if the condition is satisfied in step S330, a WOT determination is performed (S350) to increase fuel by output fuel efficiency (A / F Enrichment), and the ignition timing is made (S360).

상기에서 S340 단계에서는 WOT판정은 하지 않는다는 것은 스로틀 밸브의 개도량에 관계없이 이론 공연비로만 제어가 이루어지게 되는 바, 가속시 출력 저하를 야기시키게 된다.In the S340 step, the WOT is not determined, and thus the control is performed only at the theoretical air-fuel ratio regardless of the opening amount of the throttle valve, causing a decrease in output during acceleration.

그리고 S340 단계에서는 WOT 판정을 실시함으로써, 스로틀 개도와 엔진 RPM에 따른 연료 증량이 이루어지게 되는 출력이 향상된다.In the step S340, the WOT determination is performed, whereby the output of increasing fuel according to the throttle opening and the engine RPM is improved.

그러나 상기와 같은 제어방법에 있어서는 S340 단계에서 배기가스 규제를 나족시키기 위하여 WOT 판정을 금지하고 있는 바, 출력 저하를 초래함은 물론 가속을 위하여 가속페달을 밟더라도 출력 공연비가 출력되지 않음으로써, 수동 변속기 차량은 물론 자동 변속기 차량에 있어서도 가속감 및 출력 부족을 야기시킨다는 문제점을 내포하고 있다.However, in the control method as described above, the WOT determination is prohibited in order to satisfy the exhaust gas regulation at step S340. As a result, the output air-fuel ratio is not output even when the accelerator pedal is pressed for acceleration. In addition to transmission vehicles, there is a problem that causes a sense of acceleration and lack of output in automatic transmission vehicles.

따라서 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명된 것으로서, 본 발명의 목적은 공연비 및 점화 제어로 배기규제를 만족하면서도 출력 저하를 방지하여 가속감을 향상시킬 수 있도록 한 자동차 엔진의 공연비 및 점화제어방법를 제공함에 있다.Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to satisfy the exhaust regulation by the air-fuel ratio and ignition control while preventing the output reduction to improve the air-fuel ratio and ignition control of the automobile engine In providing a method.

도 1은 본 발명이 적용되는 시스템의 구성도.1 is a block diagram of a system to which the present invention is applied.

도 2는 본 발명에 의한 제어방법의 작동 흐름도.2 is an operational flowchart of a control method according to the present invention;

도 3은 종래 작동 흐름도이다.3 is a flowchart of a conventional operation.

이를 실현하기 위하여 본 발명은, 엔진이 시동된 상태에서 스로틀 개도각이 일정값 이상인가를 판단하는 제1 단계와;In order to realize this, the present invention includes a first step of determining whether the throttle opening angle is a predetermined value or more when the engine is started;

상기 제1 단계의 조건을 만족한 상태에서 엔진 rpm이 일정값 범위내에 있는 경우에는 스로틀 개도량의 변위 회수를 카운트 하여 1회 이상이라고 판단되면, 스로틀 개도 변위 시간을 누적하여 일정시간 이상이면, WOT 적용으로 출력 동연베로 연료 및 흡기 제어가 이루어지고, 점화시기 제어가 이루어지는 제2 단계와;If the engine rpm is within a certain value while the condition of the first step is satisfied, and the number of displacements of the throttle opening amount is determined to be one or more times, the throttle opening degree displacement time is accumulated and is equal to or more than a predetermined time. A second step in which the fuel and the intake control are performed by the output copper combustion chamber, and the ignition timing control is applied;

상기 제1 단계의 조건을 만족한 상태에서 엔진 rpm이 기준값이 이하이거나 다른 기준값 이상이라고 판단되는 경우, WOT 적용으로 출력 동연비로 연료 및 흡기 제어가 이루어지고, 점화시기 지각 제어가 이루어지는 제3 단계로 이루어지는 자동차 엔진의 공연비 및 점화 제어방법을 제공한다.When it is determined that the engine rpm is less than the reference value or more than the other reference value while the condition of the first step is satisfied, the third step of controlling the fuel and intake at the output co-fuel ratio by WOT application and controlling the ignition timing perception Provided is an air-fuel ratio and ignition control method for an automobile engine.

이하, 상기의 목적을 구체적으로 실현할 수 있는 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

도 1은 본 발명에 관계하는 제어계통의 구성도로서, 본 발명의 제어계통은 엔진 및 차량의 운전상태를 검출하는 감지수단과, 상기 감지수단으로부터 입력되는 전기적인 신호를 미리 입력되어진 데이터와 비교하여 출력하는 전자제어유닛(ECU)와, 상기 전자제어유닛으로부터 출력되는 신호에 따라 구동되는 구동수단으로 이루어진다.1 is a configuration diagram of a control system according to the present invention, wherein the control system of the present invention compares sensing means for detecting a driving state of an engine and a vehicle, and electrical signals inputted from the sensing means with previously input data. And an electronic control unit (ECU) for outputting and driving means driven according to a signal output from the electronic control unit.

상기에서 감지수단으로는 엔진의 회전수를 검출하는 엔진 rpm 센서(2)와, 차속을 검출하는 차속센서(4)와, 스로틀 포지션 센서(6)로 이루어지는데, 이의 감지수단은 이에 한정되는 것이 아니라, 본 발명을 운용하는데 최소한으로 필요한 감지수단의 구성요소이다.The sensing means includes an engine rpm sensor 2 for detecting the rotational speed of the engine, a vehicle speed sensor 4 for detecting the vehicle speed, and a throttle position sensor 6, but the sensing means is limited thereto. Rather, it is a component of the sensing means which is minimally necessary to operate the present invention.

그리고 상기 감지수단으로부터 입력되는 전기적인 신호에 따라 전자제어유닛(ECU)에서는 구동수단으로 엔진 출력에 관계되는 연료계통(8)과 흡기계통(10), 그리고 점화계통(10)을 제어하게 되는 것이다.In addition, the electronic control unit (ECU) controls the fuel system 8, the intake system 10, and the ignition system 10 related to the engine output by the driving means according to the electrical signal input from the sensing means. .

상기와 같은 제어계통을 제어할 수 있는 본 발명의 작동 흐름을 살펴보면, 도 2에서와 같이, 엔진이 시동된 상태에서(S100) 스로틀 개도각이 기준값 이상인가를 판단하게 된다(S110).Looking at the operating flow of the present invention that can control the control system as described above, as shown in Figure 2, it is determined whether the throttle opening angle is greater than the reference value in the engine start state (S100) (S110).

상기에서 스로틀 개도의 기준값은 대략 60%로 설정되며, 상기 S110 단계에서 스로틀 개도가 기준값 이상이라도 판단되면, 양측으로 분기되어 엔진 RPM이 기준값 이내인가를 판단하게 되는데(S120)(S130), 상기 S120 단계에서는 엔진 RPM이 3320RPM 이상이고 4200RPM 이하인가를 판단하고, S130 단계에서는 엔진 RPM이 3320RPM 이하 또는 4200RPM 이상인가를 판단하게 된다.The reference value of the throttle opening degree is set to approximately 60%, and if the throttle opening degree is determined to be greater than or equal to the reference value in step S110, it is branched to both sides to determine whether the engine RPM is within the reference value (S120) (S130) and the S120. In the step, it is determined whether the engine RPM is 3320 RPM or more and 4200 RPM or less, and in step S130, it is determined whether the engine RPM is 3320 RPM or less or 4200 RPM or more.

상기에서의 엔진 RPM은 수동 변속기(MT)일 경우의 예이고, 자동 변속기(AT)인 경우에는 S120 단계에서 엔진 RPM이 3320RPM 이상이고 5360RPM 이하인가를 판단하고, S330 단계에서는 엔진 RPM이 3320RPM 이하 또는 5360RPM 이상인가를 판단하게 된다.The engine RPM in the above is an example of the case of a manual transmission (MT), in the case of an automatic transmission (AT), it is determined whether the engine RPM is 3320 RPM or more and 5360 RPM or less in step S120, the engine RPM is 3320 RPM or less in step S330 or It is determined whether it is 5360 RPM or more.

그리고 상기 S120 단계에서 조건을 만족하면, 스로틀 개도량의 변위 회수를 카운트하여(S140) 1회 이상이라고 판단되면, 스로틀 개도 변위 시간을 누적하여 일정시간 이상인가를 판단하게 된다(S150).When the condition is satisfied in step S120, when the number of displacements of the throttle opening amount is counted (S140) and determined to be one or more times, it is determined whether or not the throttle opening degree is accumulated over a predetermined time (S150).

상기에서 스로틀 개도 변위 시간 누적이라고 함은 스로틀 개도각이 60% 이상인 상태에서 운전자가 더욱 가속을 하기 위하여 가속페달을 밟음에 따른 시간을 누적 계산하는 것이며, 이의 기준값을 25초로 설정하였다.The cumulative throttle opening displacement time is a cumulative calculation of the time when the driver presses the accelerator pedal for further acceleration in a state where the throttle opening angle is 60% or more, and the reference value is set to 25 seconds.

이의 기준값은 적어도 25초 이상일 때 운전자가 가속하고자 하는 의지가 있다라고 판단하기 위한 것이며, 상기 S140 단계에서 스로틀 개도량 변위 회수를 카운트 하는 것은 배기가스 규제의 만족을 위하여 피이드 백이 이루어짐으로써, 가속 페달의 변위에 따라 엔진 출력이 일정시간 동안 서서히 상승하여 급 상승으로 인한 배기가스 배출을 억제하기 위함인 것이다.The reference value is for determining that the driver is willing to accelerate when the reference value is at least 25 seconds, and counting the number of displacements of the throttle opening amount in the step S140 is a feedback for the exhaust gas regulation to satisfy the exhaust gas regulation. The engine power is gradually increased for a certain time according to the displacement to suppress the exhaust gas emission due to the sudden rise.

그리고 상기 S150 단계에서 조건이 만족되거나 상기 S130 단계에서 조건을 만족하면, WOT(Wide Open Throttle)판정을 실시하여(S160) 출력 동연비(A/F Enrichment)로 연료를 증가시키고, 점화시기 지각이 이루어지게 된다(S170).When the condition is satisfied in step S150 or the condition is satisfied in step S130, a WOT (Wide Open Throttle) determination is performed (S160) to increase fuel by output A / F Enrichment, and the ignition timing perception is increased. It is made (S170).

이에따라 차량은 연료계통(8)을 통한 연료 증량과 흡기계통(10)에 의한 흡기의 제어로 출력 동연비가 이루어지고, 점화계통(12)에 의한 점화시기 지각제어가 이루어짐으로써, 출력증가와 가속감을 증대 시킬 수 있게 되는 것이다.Accordingly, the vehicle has an output co-fuel ratio by controlling the fuel increase through the fuel system 8 and the intake by the intake system 10, and controlling the ignition timing perception by the ignition system 12, thereby increasing the output and feeling of acceleration. It can be increased.

또한, 상기 연료계통(8) 및 흡기계통(10)과 점화계통(12)의 제어경로는 종래와 마찬가지이므로 그 구성 및 제어방법의 설명은 생략하기로 한다.In addition, since the control paths of the fuel system 8, the intake system 10, and the ignition system 12 are the same as in the related art, the description of the configuration and control method will be omitted.

상기와 같은 작동 흐름은 시동 정지후 다시 시동이 이루어질 때마다 적용됨은 물론이다.The operation flow as described above is of course applied every time the start is made again after the start stop.

이상에서와 같이 본 발명에 의하면, 스로틀이 기준값 이상인 상태에서 엔진 회전수가 일정 범위내에 있는 상태에서 운전자가 가속을 위하여 가속페달을 밟는 경우, 초기 상태에서는 피이드 백 제어로 배기가스의 배출을 규제한 후, 출력 증강이 이루어짐으로써, 가속감을 증대시킬 수 있는 발명인 것이다.As described above, according to the present invention, when the driver presses the accelerator pedal for acceleration in a state where the engine speed is within a certain range in a state where the throttle is higher than or equal to the reference value, in the initial state, after the exhaust gas is regulated by the feedback control , By increasing the output is an invention that can increase the feeling of acceleration.

Claims (6)

엔진이 시동된 상태에서 스로틀 개도각이 일정값 이상인가를 판단하는 제1 단계와;A first step of determining whether the throttle opening angle is above a predetermined value in the state where the engine is started; 상기 제1 단계의 조건을 만족한 상태에서 엔진 rpm이 일정값 범위내에 있는 경우에는 스로틀 개도량의 변위 회수를 카운트 하여 1회 이상이라고 판단되면, 스로틀 개도 변위 시간을 누적하여 일정시간 이상이면, WOT 적용으로 출력 동연베로 연료 및 흡기 제어가 이루어지고, 점화시기 제어가 이루어지는 제2 단계와;If the engine rpm is within a certain value while the condition of the first step is satisfied, and the number of displacements of the throttle opening amount is determined to be one or more times, the throttle opening degree displacement time is accumulated and is equal to or more than a predetermined time. A second step in which the fuel and the intake control are performed by the output copper combustion chamber, and the ignition timing control is applied; 상기 제1 단계의 조건을 만족한 상태에서 엔진 rpm이 기준값이 이하이거나 다른 기준값 이상이라고 판단되는 경우, WOT 적용으로 출력 동연비로 연료 및 흡기 제어가 이루어지고, 점화시기 지각 제어가 이루어지는 제3 단계로 이루어지는 자동차 엔진의 공연비 및 점화 제어방법.When it is determined that the engine rpm is less than the reference value or more than the other reference value while the condition of the first step is satisfied, the third step of controlling the fuel and intake at the output co-fuel ratio by WOT application and controlling the ignition timing perception Air-fuel ratio and ignition control method of a car engine consisting of. 제1항에 있어서, 제1 단계에서의 스로틀 개도량의 기준값은 60%임을 특징으로 하는 자동차 엔진의 공연비 및 점화 제어방법.The air-fuel ratio and ignition control method for an automobile engine according to claim 1, wherein the reference value of the throttle opening amount in the first step is 60%. 제1항에 있어서, 제2단계에서의 엔진 rpm의 기준값은 수동 변속기의 경우 3320RPM 이상 4200RPM 이하이고, 자동 변속기인 경우 3320RPM 이상 5360RPM 이하임을 특징으로 하는 자동차 엔진의 공연비 및 점화 제어방법.2. The method of claim 1, wherein the reference value of the engine rpm in the second stage is 3320 RPM or more and 4200 RPM or less in the case of a manual transmission, and 3320 RPM or more and 5360 RPM or less in the case of an automatic transmission. 제1항에 있어서, 제3 단계에 있어서의 엔진 rpm의 기준값은 수동변속기의 경우 3320RPM 이하 4200RPM 이상이고, 자동 변속기의 경우 3320RPM 이하 5360RPM 이상임을 특징으로 하는 자동차 엔진의 공연비 및 점화 제어방법.The air-fuel ratio and ignition control method for an automobile engine according to claim 1, wherein the reference value of the engine rpm in the third step is 3320 RPM or less and 4200 RPM or more for the manual transmission, and 3320 RPM or less and 5360 RPM or more for the automatic transmission. 제1항에 있어서, 제2 단계에서 스로틀 개도량의 변위 회수가 1회 이내의 경우에는 피이드 백 제어가 이루어짐을 특징으로 하는 자동차 엔진의 공연비 및 점화 제어방법.The air-fuel ratio and ignition control method for an automobile engine according to claim 1, wherein the feedback control is performed when the number of displacements of the throttle opening amount is less than one in the second step. 제1항에 있어서, 제2 단계에 있어서, 누적시간의 기준값은 25초임을 특징으로 하는 자동차 엔진의 공연비 및 점화 제어방법.The method of claim 1, wherein in the second step, the reference value of the cumulative time is 25 seconds.
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