KR100305809B1 - Control method of air fuel ratio of hydrogen engine - Google Patents

Control method of air fuel ratio of hydrogen engine Download PDF

Info

Publication number
KR100305809B1
KR100305809B1 KR1019970080028A KR19970080028A KR100305809B1 KR 100305809 B1 KR100305809 B1 KR 100305809B1 KR 1019970080028 A KR1019970080028 A KR 1019970080028A KR 19970080028 A KR19970080028 A KR 19970080028A KR 100305809 B1 KR100305809 B1 KR 100305809B1
Authority
KR
South Korea
Prior art keywords
fuel
pressure
hydrogen
injection time
engine
Prior art date
Application number
KR1019970080028A
Other languages
Korean (ko)
Other versions
KR19990059814A (en
Inventor
이황복
Original Assignee
이계안
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 이계안, 현대자동차주식회사 filed Critical 이계안
Priority to KR1019970080028A priority Critical patent/KR100305809B1/en
Publication of KR19990059814A publication Critical patent/KR19990059814A/en
Application granted granted Critical
Publication of KR100305809B1 publication Critical patent/KR100305809B1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
    • F02D19/026—Measuring or estimating parameters related to the fuel supply system
    • F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
    • 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
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A control method of air fuel ratio of a hydrogen engine is provided to control the injection moment of hydrogen fuel at the excess section by controlling the injection time of the hydrogen fuel with considering the pressure difference considering the temperature of the hydrogen fuel at the excess section. CONSTITUTION: A control method of air fuel ratio of a hydrogen engine includes several steps of: measuring the temperature and the pressure of fuel and obtaining the difference between the mapped pressure of fuel according to an intake air amount and an engine RPM and the measured pressure(S20,S30); calculating an allowable error of the pressure difference(S40); outputting a fuel compensation control signal considering the mapping pressure and the pressure compensation map value of fuel when the pressure difference is over a limit value of the allowable error(S50,S60,S90); and outputting a compensation control signal of the injection time considering the fuel injection time and compensation map value of the fuel pressure when the pressure difference is within the range of the calculated allowable error(S70,S80,S90).

Description

수소 엔진의 공연비 제어 방법Air-fuel ratio control method of hydrogen engine

본 발명은 공연비 제어에 관한 것으로서, 더욱 상세하게 기술하면 수소 엔진의 수소 연료 상태를 점검하여 엔진을 제어하는 수소 엔진의 공연비 제어 방법에 관한 것이다.The present invention relates to air-fuel ratio control, and more particularly, to an air-fuel ratio control method of a hydrogen engine for controlling an engine by checking a hydrogen fuel state of a hydrogen engine.

수소 연료는 가솔린이나 디젤유 및 천연가스 등의 화석 연료가 고갈되어 감에 따른 대체 연료로써 폭발성이 강한 특성이 있다.Hydrogen fuel has a strong explosive property as an alternative fuel due to the depletion of fossil fuels such as gasoline, diesel oil and natural gas.

종래의 수소 엔진은 수소 연료를 분사량을 연료의 압력과 흡입 공기량에 대한 함수로 정해진 맵핑값에 의해 연료의 분사 시간만으로 공연비 제어를 하므로써 엔진 제어의 과도 구간에서는 공연비 제어가 불량하게 이루어지는 문제점이 있다.The conventional hydrogen engine has a problem in that the air-fuel ratio control is poor in the transient section of the engine control by controlling the air-fuel ratio by the injection time of the fuel only by the mapping value determined as a function of the fuel pressure and the intake air amount of the hydrogen fuel.

따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로써, 수소 엔진 제어에 있어 특히 과도 구간에 수소 연료의 온도를 고려한 압력 차이를 고려하여 수소 연료의 분사 시간을 조절하는 수소 엔진의 공연비 제어 방법을 제공하기 위한 것이다.Accordingly, an object of the present invention is to solve the above problems, in the control of the air-fuel ratio of the hydrogen engine to control the injection time of the hydrogen fuel in consideration of the pressure difference in consideration of the temperature of the hydrogen fuel, especially in the transient section in the hydrogen engine control It is to provide a method.

도1은 본 발명에 따른 수소 엔진의 공연비 제어 흐름도이다.1 is an air-fuel ratio control flowchart of a hydrogen engine according to the present invention.

상기한 목적을 달성하기 위한 본 발명의 특징은,Features of the present invention for achieving the above object,

연료의 온도 및 압력을 측정하고 흡입 공기량과 엔진 회전수에 따른 연료의 맵핑된 압력과 측정 압력 차이를 구하는 단계와;Measuring the temperature and pressure of the fuel and obtaining a difference between the mapped pressure and the measured pressure of the fuel according to the amount of intake air and the engine speed;

상기 압력 차이의 허용 오차를 계산하여 한계치를 넘는 경우 맵핑 압력과 연료의 압력 보상 맵값을 고려한 연료 압력의 보정 제어 신호를 출력하는 단계와;Calculating a tolerance error of the pressure difference and outputting a correction control signal of the fuel pressure in consideration of a mapping pressure and a pressure compensation map value of the fuel when the threshold value is exceeded;

상기 압력 차이가 허용 오차 범위에 있는 경우 연료 분사 시간과 연료 분사 시간에 따른 연료 압력 보상 맵값을 고려한 연료 분사 시간의 보정 제어 신호를 출력하는 단계로 이루어진다.And outputting a correction control signal for the fuel injection time in consideration of the fuel injection time and the fuel pressure compensation map value according to the fuel injection time when the pressure difference is within the tolerance range.

본 발명을 용이하게 실시할 수 있는 가장 바람직한 실시예를 첨부된 도면을 참조로 하여 상세히 설명한다.Best Mode for Carrying Out the Invention The present invention will be described in detail with reference to the accompanying drawings.

첨부한 도1에 도시되어 있는 바와 같이 본 발명의 작용은 다음과 같다.As shown in the accompanying Figure 1, the operation of the present invention is as follows.

수소 엔진은 가솔린 엔진과 같이 흡입 공기량과 엔진 회전수 등의 변수에 따라 맵핑된 값으로 연료를 엔진 내부로 인젝션 되어 압축 폭발되므로써 동력을 얻는 구조로 이루어져있다.Like a gasoline engine, a hydrogen engine is composed of a structure that obtains power by injecting fuel into the engine and compressing it with a value mapped according to variables such as intake air amount and engine speed.

수소 엔진은 평탄로에서 동작시 등의 과도 구간이 아닌 경우는 공연비 제어가 문제가 되지 않으나 급가속이나 큰 토크가 걸리게 되는 경우 아래와 같은 보정이 필요하게 된다.If the hydrogen engine is not in the transient section, such as when operating on a flat road, air-fuel ratio control is not a problem, but when rapid acceleration or large torque is applied, the following correction is required.

엔진의 공연비 제어는 차량 내부의 제어장치(도시않됨)가 각 요소들의 검출하여 계산하므로써 엔진을 제어한다.The air-fuel ratio control of the engine controls the engine by a control device (not shown) inside the vehicle detecting and calculating each element.

제어장치는 먼저 엔진 동작에 필요한 수소 연료의 압력과 온도를 측정하며, 공기관에서 엔진으로 유입되는 흡입 공기량과 엔진 회전수의 요소에 대해 고려한 연료의 맵핑 압력과 상기에서 측정된 수소 연료의 측정 압력과의 차이를 계산한다(S20,S30).The controller first measures the pressure and temperature of the hydrogen fuel required for engine operation. The control pressure maps the fuel pressure and the measured pressure of the hydrogen fuel, taking into account the factors of the amount of intake air flowing into the engine and the engine speed. Compute the difference (S20, S30).

제어장치는 상기 단계에서 계산된 연료의 맵핑 압력과 측정된 연료의 압력 차이가 보정 허용 오차를 계산하여 차량 주행 상태가 과도 구간인지 판단하게 된다(S40).The control device determines whether the vehicle driving state is a transient section by calculating a correction tolerance between the difference between the mapping pressure of the fuel calculated in the step and the measured fuel pressure (S40).

제어장치는 상기 판단에서 압력 차이가 허용 오차의 한계치를 넘는 경우와 넘지 않는 경우로 나누어 연료의 인젝션 시간 및 연료의 분사 압력을 보정할 것인지 판단하게 된다.The control device determines whether to correct the injection time of the fuel and the injection pressure of the fuel by dividing the pressure difference into the case where the pressure difference exceeds the limit of the tolerance and the case that does not exceed.

만일, 압력 차이가 한계치를 넘는 경우는 엔진의 회전수와 흡입 공기량에 대한 함수로 연료 압력에 대한 맵값과 연료의 압력 차이에 대한 함수를 고려한 연료 압력의 압력 보상 맵값을 이용하여 연료 분사 압력을 결정하고 출력한다(S50,S60,S90).If the pressure difference exceeds the limit, the fuel injection pressure is determined using the map value for the fuel pressure and the pressure compensation map value considering the function of the pressure difference of the fuel as a function of the engine speed and the intake air amount. And output (S50, S60, S90).

즉, 압력 차이가 한계치 보다 큰 경우는 차량의 가, 감속의 구간인 과도 구간에서 발생하는 것으로 이 경우에는 연료 압력 값 자체를 보정하여 빠른 시간내에 정상적인 연료 압력으로 회복할 수 있도록 보상하는 것이다.In other words, if the pressure difference is greater than the threshold value, it occurs in the transient section, which is the period of acceleration and deceleration of the vehicle. In this case, the fuel pressure value itself is corrected to compensate for the recovery to the normal fuel pressure within a short time.

제어장치는 상기 단계(S40)의 판단에서 압력 차이가 한계치의 범위에 위치한 경우 연료의 분사 시간과 연료의 압력 차이에 대한 함수로 연료 분사 시간의 압력 보상에 대해 설정된 맵값을 이용해 연료 분사 시간을 결정하고 출력한다(S70,S80,S90).The control device determines the fuel injection time using the map value set for the pressure compensation of the fuel injection time as a function of the fuel injection time and the pressure difference of the fuel when the pressure difference is located in the limit value in the determination of the step S40. And output (S70, S80, S90).

다시 기술하면, 압력 차이가 한계치 보다 작은 경우로써 이 경우에는 연료 분사 시간을 보정하여 공연비 제어를 할 수 있도록 하는 것이다.In other words, when the pressure difference is smaller than the threshold value, in this case, the fuel injection time is corrected to enable the air-fuel ratio control.

이상에서와 같이 본 발명의 실시예에서, 수소 엔진 제어에 있어 특히 과도 구간에 수소 연료의 온도를 고려한 압력 차이를 고려하여 수소 연료의 분사 시간을 조절하므로써 과도 구간에서 공연비 제어가 가능한 효과를 가지는 수소 엔진의 공연비 제어 방법을 제공한다.As described above, in the embodiment of the present invention, in the hydrogen engine control, the hydrogen having the effect of controlling the air-fuel ratio in the transient section by adjusting the injection time of the hydrogen fuel in consideration of the pressure difference considering the temperature of the hydrogen fuel in the transient section Provided is an air-fuel ratio control method for an engine.

Claims (1)

연료의 온도 및 압력을 측정하고 흡입 공기량과 엔진 회전수에 따른 연료의 맵핑된 압력과 측정 압력 차이를 구하는 단계와;Measuring the temperature and pressure of the fuel and obtaining a difference between the mapped pressure and the measured pressure of the fuel according to the amount of intake air and the engine speed; 상기 압력 차이의 허용 오차를 계산하는 단계;Calculating a tolerance of the pressure difference; 상기 압력 차이가 허용 오차의 한계치를 넘는 경우 맵핑 압력과 연료의 압력 보상 맴값을 고려한 연료 보정 제어신호를 출력하는 단계와;Outputting a fuel correction control signal in consideration of a mapping pressure and a pressure compensation value of fuel when the pressure difference exceeds a limit of an allowable error; 상기 압력 차이가 계산된 상기 허용 오차 범위에 있는 경우 연료 분사 시간과 연료 분사 시간에 따른 연료 압력 보상 맵값을 고려한 연료 분사 시간의 보정 제어신호를 출력하는 단계를 포함하는 것을 특징으로 하는 수소 엔진의 공연비 재어방법.And outputting a correction control signal of the fuel injection time in consideration of the fuel injection time and the fuel pressure compensation map value according to the fuel injection time when the pressure difference is within the calculated tolerance range. How to take it.
KR1019970080028A 1997-12-31 1997-12-31 Control method of air fuel ratio of hydrogen engine KR100305809B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019970080028A KR100305809B1 (en) 1997-12-31 1997-12-31 Control method of air fuel ratio of hydrogen engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019970080028A KR100305809B1 (en) 1997-12-31 1997-12-31 Control method of air fuel ratio of hydrogen engine

Publications (2)

Publication Number Publication Date
KR19990059814A KR19990059814A (en) 1999-07-26
KR100305809B1 true KR100305809B1 (en) 2001-12-17

Family

ID=37530209

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019970080028A KR100305809B1 (en) 1997-12-31 1997-12-31 Control method of air fuel ratio of hydrogen engine

Country Status (1)

Country Link
KR (1) KR100305809B1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06200806A (en) * 1992-12-28 1994-07-19 Mazda Motor Corp Air-fuel ratio control device of hydrogen engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06200806A (en) * 1992-12-28 1994-07-19 Mazda Motor Corp Air-fuel ratio control device of hydrogen engine

Also Published As

Publication number Publication date
KR19990059814A (en) 1999-07-26

Similar Documents

Publication Publication Date Title
KR100694742B1 (en) Method and device for operating an internal combustion engine
KR19990013660A (en) Ignition and combustion control of internal combustion engines
US20030213465A1 (en) Method and device for controlling an engine
US4498443A (en) Fuel supply control method having fail-safe function for abnormalities in intake passage pressure detecting means of an internal combustion engine having a turbocharger
US7444994B2 (en) Control system for internal combustion engine
KR100288519B1 (en) Apparatus and method for evaluating the concentration of vaporized fuel purged into the intake air passage of an internal combustion engine
US6460514B1 (en) Method and apparatus for controlling fuel injection quantity for an internal combustion engine equipped with a turbocharger
US20140360464A1 (en) Internal combustion engine control device
KR100376704B1 (en) Method of providing torque information for engine
US5829247A (en) Control system for a combustion engine
KR100305809B1 (en) Control method of air fuel ratio of hydrogen engine
JP4460077B2 (en) Internal combustion engine control method and apparatus
KR100797383B1 (en) Method, computer programme and control and/or regulation device for operating an internal combustion engine
US4909223A (en) Air-fuel ratio control apparatus for multicylinder engine
KR20010024586A (en) Method and device for operating and monitoring an internal combustion engine
BR0317236A (en) Combustion engine for a motor vehicle
KR100333870B1 (en) fuel control valve and fuel control method in idle state of a diesel vehicle
JPH11166433A (en) Method and device for controlling output of dual fuel engine
KR100295852B1 (en) Method for substituting for map value when map sensor has fault
KR100768359B1 (en) Method and device for operating of an engine
KR200253733Y1 (en) Device for control fule jet for cars
KR100217074B1 (en) Method and device for control of engine by using compensation of engine friction loss
KR100290363B1 (en) Method for two way compensating asynchronic injection quantity
KR100203121B1 (en) Recognizing method of atmospheric pressure at high altitude
KR19990025462A (en) How to reduce exhaust gas of a car

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20090731

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee