KR100219209B1 - A system for compensating of fuel by deducting of atmospheric pressure - Google Patents
A system for compensating of fuel by deducting of atmospheric pressure Download PDFInfo
- Publication number
- KR100219209B1 KR100219209B1 KR1019960075996A KR19960075996A KR100219209B1 KR 100219209 B1 KR100219209 B1 KR 100219209B1 KR 1019960075996 A KR1019960075996 A KR 1019960075996A KR 19960075996 A KR19960075996 A KR 19960075996A KR 100219209 B1 KR100219209 B1 KR 100219209B1
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- South Korea
- Prior art keywords
- atmospheric pressure
- temperature
- fuel correction
- opening angle
- throttle valve
- Prior art date
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Classifications
-
- 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
- F02D41/30—Controlling fuel injection
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0404—Throttle position
-
- 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
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
-
- 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
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
- F02D2200/704—Estimation of atmospheric pressure
Abstract
본 발명의 목적은 고지주행시 충진효율 저하에 따른 출력 저하를 보상하기 위해 액셀러레이터 페달을 더 밞게 되는 원리를 이용하여 대기압 센서가 없이도 대기압을 추정하여 연료 보정을 행할 수 있는 연료 보정 시스템을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel correction system capable of performing fuel correction by estimating atmospheric pressure without using an atmospheric pressure sensor by using the principle that the accelerator pedal is further pushed to compensate for a decrease in output due to a decrease in filling efficiency during high driving.
상기한 목적을 달성하기 위한 본 발명의 수단은, 대기 압력에 따라서 연료 보정을 행하는 전자제어장치를 보유하는 연료 보정 시스템에 있어서, 상기 전자제어장치는 드로틀 포지션 센서로부터 검출되는 드로틀 밸브의 개도각과 온도센서로부터 검출된 대기 온도 정보를 읽어들여 하기식에 의해 추정 대기압을 계산하여 연료 보정을 행하는 것임을 특징으로 한다.A means of the present invention for achieving the above object is a fuel correction system having an electronic control device for performing fuel correction in accordance with atmospheric pressure, the electronic control device is the opening angle and temperature of the throttle valve detected from the throttle position sensor It is characterized in that fuel correction is performed by reading the atmospheric temperature information detected from the sensor, calculating the estimated atmospheric pressure by the following equation.
여기서 Pa : 고지에서의 추정 대기압(mmHg)Where Pa is the estimated atmospheric pressure at high altitude (mmHg)
VTPS1: 표준상태의 대기압(760mmHg) 하에서의 드로틀 밸브의 개도각으로서 전자제어장치에 미리 입력 설정된 값.V TPS1 : Opening angle of throttle valve under atmospheric pressure ( 760mmHg ) at standard condition.
VTPS2: 드로틀 포지션 센서에 의해 검출된 현재의 드로틀 밸브의 개도각V TPS2 : Opening angle of the current throttle valve detected by the throttle position sensor
T1: 표준상태(25℃ 기준)의 절대온도로서 전자제어장치에 미리 입력되어 있는 값.T 1 : Absolute temperature in standard condition (25 ℃ standard).
T2: 온도센서에 의해 측정된 현재의 대기온도(절대온도)T 2 : Current ambient temperature (absolute temperature) measured by temperature sensor
Description
본원 발명은 대기압 센서가 구비되어 있지 아니한 차량에서 현재의 대기압을 추정하여 연료보정을 행하는 연료 보정 시스템에 관한 것이다.The present invention relates to a fuel correction system for performing fuel correction by estimating the current atmospheric pressure in a vehicle that is not equipped with an atmospheric pressure sensor.
종래 평지가 아닌 고지나 저지대의 주행시 압력차이에 따른 공기밀도 변화로 흡입 공기량이 번화되므로써 공연비가 목표로 부터 벗어나는 것을 방치하고자 대기압 센서를 이용하여 대기압력을 측정한 후 이를 신호로 받은 전자 제어 장치에 의해 연료 보정을 행하고 있다.In order to prevent the air-fuel ratio from escaping from the target due to the change in air density due to the difference in air pressure due to the difference in pressure when driving on a highland or lowland, the air pressure sensor is measured using an atmospheric pressure sensor, and then the signal is sent to the electronic control device. Fuel correction is performed.
그러나 상기한 방식은 대기압 센서를 부착하여야 하므로 차량 비용이 상승되며 통상 저가의 차량에는 대기압 센서가 부착되지 아니하기 때문에 대기압 센서를 구비하지 아니한 차량의 경우 대기압이 표준치를 벗어날 때는 연료 보정에 대한 학습치에 오차가 발생하여 목표로 하는 공연비를 달성할 수 없다는 문제점이 지적되고 있다.However, in the above method, the vehicle cost is increased because the atmospheric pressure sensor must be attached, and since the atmospheric pressure sensor is not attached to the low-cost vehicle, the learning value for fuel correction when the atmospheric pressure is outside the standard value for the vehicle without the atmospheric pressure sensor It is pointed out that an error occurs and the target air-fuel ratio cannot be achieved.
이에 본 발명은 상기한 문제점을 감안하여 제안한 것으로서 그의 목적으로 하는바는 고지주행시 충진효율 저하에 따른 출력 저하를 보상하기 위해 액셀러레이터 페달을 더 밟게 되는 원리를 이용하여 대기압 센서가 없이도 대기압을 추정하여 연료 보정을 행할 수 있는 연료 보정 시스템을 제공하는데 있다.Therefore, the present invention has been proposed in view of the above problems, and its purpose is to estimate the atmospheric pressure without using an atmospheric pressure sensor by using the principle of stepping on the accelerator pedal to compensate for the lowering of output due to the lowering of the filling efficiency during high driving. The present invention provides a fuel correction system capable of performing correction.
상기한 목적을 달성하기 위한 본 발명의 수단은, 대기 압력에 따라서 연료 보정을 행하는 전자제어장치를 보유하는 연료 보정 시스템에 있어서, 상기 전자제어장치는 드로틀 포지션 센서로부터 검출되는 드로틀 밸브의 개도각과 온도센서로부터 검출된 대기 온도 정보를 읽어들여 하기식에 의해 추정 대기압을 계산하여 연료 보정을 행하는 것임을 특징으로 한다.A means of the present invention for achieving the above object is a fuel correction system having an electronic control device for performing fuel correction in accordance with atmospheric pressure, the electronic control device is the opening angle and temperature of the throttle valve detected from the throttle position sensor It is characterized in that fuel correction is performed by reading the atmospheric temperature information detected from the sensor, calculating the estimated atmospheric pressure by the following equation.
여기서 Pa : 고지에서의 추정 대기압(mmHg)Where Pa is the estimated atmospheric pressure at high altitude (mmHg)
VTPS1: 표준상태의 대기압(760mmHg) 하에서의 드로틀 밸브의 개도각으로서 전자제어장치에 미리 입력 설정된 값.V TPS1 : Opening angle of throttle valve under atmospheric pressure ( 760mmHg ) at standard condition.
VTPS2: 드로틀 포지션 센서에 의해 검출된 현재의 드로틀 밸브의 개도각V TPS2 : Opening angle of the current throttle valve detected by the throttle position sensor
T1: 표준상태(25℃ 기준)의 절대온도로서 전자제어장치에 미리 입력되어 있는 값.T 1 : Absolute temperature in standard condition (25 ℃ standard).
T2: 온도센서에 의해 측정된 현재의 대기온도(절대온도)T 2 : Current ambient temperature (absolute temperature) measured by temperature sensor
제1도는 평지와 고지 주행시 엔진 출력과 드로틀 밸브 개도각과의 상관 관계를 나타내는 그래프.1 is a graph showing the correlation between the engine output and the throttle valve opening angle during driving on flat and high ground.
제2도는 본 발명에 의한 연료 보정 시스템을 나타내는 블록도.2 is a block diagram showing a fuel correction system according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 전자제어장치 11 : 드로틀 포지션 센서(TPS)10: electronic control device 11: throttle position sensor (TPS)
12 : 대기 온도센서12: ambient temperature sensor
이하 본 발명의 실시예를 제1도와 제2도를 참조하여 설명한다.An embodiment of the present invention will now be described with reference to FIGS. 1 and 2.
제1도는 엔진 출력과 드로틀 포지션 센서(Throtle Position Sensor) 출력값의 상관관계를 나타내는 그래프로서 평지에서 보다는 공기 밀도가 저하되는 고지에서 동일 출력을 얻기 위해서 드로틀 밸브의 개도각이 더 클 것이 요구된다.FIG. 1 is a graph showing the correlation between the engine output and the throttle position sensor output value, and the opening angle of the throttle valve is required to be larger in order to obtain the same output at high altitude where the air density is lowered than on the flat.
이에따라 고지 주행시에는 충진 효율 저하에 따른 출력저하를 보상하기 위하여 엑셀레이터 페달을 더 밟게 되므로써 드로틀 밸브의 개도각을 증가시기게 되며 전자제어장치에 미리 입력 설정된 TPS값과의 상대치로 대기압을 측정하게 된다.Accordingly, when driving on the hill, the accelerator pedal is further pressed to compensate for the decrease in output due to the decrease in filling efficiency, thereby increasing the opening angle of the throttle valve and measuring the atmospheric pressure in relation to the TPS value preset in the electronic controller.
한편 충진효율은 압력뿐 아니라 기온과도 함수관계에 있는바 온도와 밀도와의 관계는 밀도의 관계(반비례 관계)가 성립되며 압력과 밀도는 비례 관계에 있으며 밀도와 드로틀 밸브의 개도각은 반비례 관계가 성립한다.On the other hand, the filling efficiency is not only a function of pressure but also a temperature, so the relationship between temperature and density Relationship is inversely proportional, pressure and density are proportional, and the opening angle of the throttle valve is inversely proportional.
따라서 압력이 낮아지고 온도가 높아지면 밀도가 저하되어 충진 효율이 낮아져 출력이 저하되고 반대로 압력이 높아지고 온도가 낮아지면 공기 밀도가 높아져 충진 효율이 높아지게 되고 출력은 증대되어지게 된다.Therefore, when the pressure is lowered and the temperature is increased, the density is lowered, the filling efficiency is lowered, and the output is lowered. On the contrary, when the pressure is increased and the temperature is lowered, the air density is increased, the filling efficiency is increased, and the output is increased.
본 발명은 상기한 드로틀 밸브의 개도각 정보와 대기온도에 의해 현재의 대기압을 추정하여 연료 보정을 정밀하게 수행하기 위한 것으로서 하기식에 의해 전자제어장치(10)는 드로틀 포지션 센서(11)로부터 검출된 드로틀 밸브 개도각을 표준상태로 미리 입력된 예를들면, 압력 760mmμg, 온제2도5℃의 경우에서의 최적의 드로틀 밸브 개도각과를 비교한 상대치로서 현재의 대기압을 추정하게 된다.The present invention is for accurately performing fuel correction by estimating the current atmospheric pressure based on the opening angle information of the throttle valve and the atmospheric temperature, and the electronic controller 10 detects the throttle position sensor 11 by the following equation. The current atmospheric pressure is estimated as a relative value compared with the optimal throttle valve opening angle in the case of a pressure of 760 mm μg and a temperature of 2 degrees Celsius, for example, a preset throttle valve opening angle is input in a standard state.
여기서 Pa :고지에서의 추정 대기압(mmHg)Where Pa is the estimated atmospheric pressure at high altitude (mmHg)
VTPS1: 표준상태의 대기압(760mmHg) 하에서의 드로틀 밸브의 개도각으로서 전자제어장치에 미리 입력 설정된 값.V TPS1 : Opening angle of throttle valve under atmospheric pressure ( 760mmHg ) at standard condition.
VTPS2: 드로틀 포지션 센서에 의해 검출된 현재의 드로틀 밸브의 개도각V TPS2 : Opening angle of the current throttle valve detected by the throttle position sensor
T1: 표준상태(25℃ 기준)의 절대온도로서 전자제어장치에 미리 입력되어있는 값.T 1 : Absolute temperature in standard condition (25 ℃), pre-inputted in the electronic controller.
T2: 온도센서에 의해 측정된 현재의 대기온도(절대온도)T 2 : Current ambient temperature (absolute temperature) measured by temperature sensor
상기 (1)식에 설정된 바와같이 전자제어장치(10)는 드로틀 포지션 센서(11)와 온도센서(12)에 의해 현재의 드로틀 밸브의 개도각과 대기온도를 읽어들인 후 미리 입력되어 있는 표준상태의 드로틀 밸브 개도각과 대기온도와의 비율로서 상기 (1)식에 의거하여 추정 대기압(Pa)을 산출하게 되며 이를 근거로 피드백 제어하여 연료 분사량의 보정을 행하게 되는데 추정 대기압(Pa)이 낮을때에는 연료 분사량이 많아지도록 제어하므로써 출력저하를 방지한다.As set in equation (1), the electronic controller 10 reads the opening angle and the atmospheric temperature of the current throttle valve by the throttle position sensor 11 and the temperature sensor 12, The estimated atmospheric pressure (Pa) is calculated based on Equation (1) as a ratio between the throttle valve opening angle and the ambient temperature, and the fuel injection amount is corrected by feedback control based on this. When the estimated atmospheric pressure (Pa) is low, the fuel injection amount is calculated. The output is prevented by controlling to increase the number.
이상과 같은 본 발명에 의하면 전자제어장치에 미리 입력되어 있는 표준상태하에서의 드로틀 밸브 개도각과 절대온도를 드로틀 포지션 센서와 대기 온도센서로부터 현재 검출되어진 드로틀 밸브 개도각과 대기온도와의 비를 계산하여 현재의 추정 대기압을 산출하며 이를 근거로 연료 보정을 행하게 되므로써 대기압 센서를 구비하지 아니하고도 대기압 추정에 의한 연료 보정이 가능하여 차량 구조를 단순화하고 가격을 낮추게 되는 효과가 있다.According to the present invention as described above, the ratio between the throttle valve opening angle and the ambient temperature currently detected from the throttle position sensor and the ambient temperature sensor is calculated by calculating the ratio between the throttle valve opening angle and the absolute temperature under the standard state previously inputted to the electronic controller. By calculating the estimated atmospheric pressure and performing fuel correction based on the estimated atmospheric pressure, fuel correction by atmospheric pressure estimation is possible without having an atmospheric pressure sensor, thereby simplifying the vehicle structure and reducing the price.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960075996A KR100219209B1 (en) | 1996-12-30 | 1996-12-30 | A system for compensating of fuel by deducting of atmospheric pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960075996A KR100219209B1 (en) | 1996-12-30 | 1996-12-30 | A system for compensating of fuel by deducting of atmospheric pressure |
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| Publication Number | Publication Date |
|---|---|
| KR19980056726A KR19980056726A (en) | 1998-09-25 |
| KR100219209B1 true KR100219209B1 (en) | 1999-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960075996A KR100219209B1 (en) | 1996-12-30 | 1996-12-30 | A system for compensating of fuel by deducting of atmospheric pressure |
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| Country | Link |
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| KR (1) | KR100219209B1 (en) |
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1996
- 1996-12-30 KR KR1019960075996A patent/KR100219209B1/en not_active IP Right Cessation
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