KR100271919B1 - Method for controlling injection time of an internal combustion engine - Google Patents

Method for controlling injection time of an internal combustion engine Download PDF

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KR100271919B1
KR100271919B1 KR1019970047035A KR19970047035A KR100271919B1 KR 100271919 B1 KR100271919 B1 KR 100271919B1 KR 1019970047035 A KR1019970047035 A KR 1019970047035A KR 19970047035 A KR19970047035 A KR 19970047035A KR 100271919 B1 KR100271919 B1 KR 100271919B1
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solenoid valve
time period
time
injection
total
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KR1019970047035A
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Korean (ko)
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KR19990025426A (en
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이흥배
김형동
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박상록
주식회사두원정공
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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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors

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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 control method for an injection time point and an injection time period of an internal combustion engine is provided to precisely control the fuel injection with respect to a combustion chamber to improve the engine output and stabilize the engine. CONSTITUTION: A control method for an injection time point and an injection time period of an internal combustion engine includes the steps of reading a target injection time point(Ae) from input information on an engine rpm and a target injection period(ADC), reading a response time period(ADR) of a solenoid valve, operating a total time period(ATT) by deducting the target injection period and the response time period from a total control time period(θ1), outputting a commander pulse of 'ON' state for driving the solenoid valve in the total time period by counting clock pulses and rotation pulses(SS), operating the total injection time period by adding the target injection time period to the target injection time period by receiving information on the response time period of the solenoid valve, the engine rpm and a load amount, and outputting a commander pulse of 'OFF' state for driving the solenoid valve after the total injection time period after outputting a current for driving the solenoid valve.

Description

내연기관의 분사시기 및 분사시간 제어방법Injection time and injection time control method of internal combustion engine

본 발명은 내연기관의 분사시기 및 분사시간 제어방법에 관한 것으로서, 더욱 상세하게는 총제어시기와 솔레노이드 밸브의 응답시기 그리고 목표 분사시기에 의해 분사시기를 결정하여 솔레노이드 밸브를 구동시킨후 솔레노이드 밸브의 응답시간과 목표 분사기간에 의해 설정된 기간동안 솔레노이드 밸브를 구동시켜 분사량을 조절할 수 있도록 하는 내연기관의 분사시기 및 분사기간 제어방법에 관한 것이다.The present invention relates to a method for controlling the injection timing and injection time of an internal combustion engine, and more particularly, the injection timing is determined by the total control timing, the response timing of the solenoid valve, and the target injection timing, and then the solenoid valve is driven. The present invention relates to a method for controlling an injection timing and an injection period of an internal combustion engine that drives a solenoid valve for a period of time set by a response time and a target injection period to adjust an injection amount.

일반적으로 내연기관의 분사시기와 분사시간은 캠축의 회전각도, 그리고 엔진회전수에 의해 솔레노이드 밸브의 개폐시기와 개폐시간을 조절되어서 연소실에 공급되는 분사량이 조절된다.In general, the injection timing and the injection time of the internal combustion engine are controlled by the rotation angle of the camshaft and the engine speed to control the opening / closing time and opening / closing time of the solenoid valve to control the amount of injection supplied to the combustion chamber.

그러나 상기한 바와 같은 방법에 의해 연료의 분사시기와 분사시간을 조절하게 되면, 분사시기와 분사량이 정확하게 이루어지지 않아 엔진출력이 떨어짐은 물론이고, 연료 연소시 유해한 배기가스가 다량으로 배출되는 결점이 있다.However, when the injection timing and injection time of the fuel are adjusted by the method described above, the injection timing and injection amount are not made accurately, and thus the engine output decreases, and there is a drawback that a large amount of harmful exhaust gas is emitted during fuel combustion. have.

이에 본 발명은 상기한 바와같은 결점을 해결하기위해서 안출된 것으로서, 총제어시기와 솔레노이드 밸브의 응답시기 그리고 목표 분사시기에 의해 분사시기를 결정하여 솔레노이드 밸브를 구동시킨후 솔레노이드 밸브의 응답시간과 목표 분사기간에 의해 설정된 기간동안 솔레노이드 밸브를 구동시켜 분사량을 조절할 수 있도록 하는 내연기관의 분사시기 및 분사기간 제어방법을 제공하고자 하는데 그 목적이 있는 것이다.Accordingly, the present invention has been made to solve the above-described drawbacks, the injection timing is determined by the total control timing, the response timing of the solenoid valve and the target injection timing to drive the solenoid valve and then the response time and target of the solenoid valve. It is an object of the present invention to provide a method for controlling the injection timing and the injection period of an internal combustion engine that can control the injection amount by driving a solenoid valve for a period set by the injection period.

도 1은 본 발명을 설명하기위한 타임챠트이다.1 is a time chart for explaining the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

ADC :목표 분사기간 Aθ: 목표 분사시기A DC: Target injection period A θ : Target injection period

ADR:응답시기 θ1 : 총제어시기A DR : Response time θ1: Total control time

ATT: 총타임시기 SS : 회전펄스A TT : Total time SS: Rotating pulse

TDR: 응답시간 ADC: 목표 분사시기T DR : Response time A DC : Target injection timing

TDC: 목표 분사시간 TTD: 총분사시간T DC : Target injection time T TD : Total injection time

이하 본 발명의 일 실시예에 따른 구성을 예시도면과 함께 보다 상세히 설명하면 다음과 같다.Hereinafter, the configuration according to an embodiment of the present invention in more detail with an exemplary drawing as follows.

도 1은 본 발명에 따른 타임챠트로서, 엔진회전수와 목표 분사기간(ADC)의 정보를 입력받아 맵으로부터 목표 분사시기(Aθ)를 읽어내는 단계와, 솔레노이드 밸브의 응답시기(ADR)를 읽어내는 단계와, 총제어시기(θ1)로부터 목표 분사시기(Aθ)와 응답시기(ADR)를 감산하여 총타임시기(ATT)를 연산하는 단계와, 회전펄스(SS)와 클럭펄스를 카운팅하여 총타임시기(ATT)에 솔레노이드 밸브를 구동시키기위한 명령펄스를 "ON" 상태로 출력하는 단계와, 솔레노이드 밸브의 응답시간(TDR)과 엔진회전수와 부하량의 정보를 입력받아 맵으로부터 읽어낸 목표 분사시기(ADC)에 대응하는 목표 분사시간(TDC)을 가산하여 총분사시간(TTD)을 연산하는 단계와, 솔레노이드 밸브를 구동시키기위한 구동전류 출력후 총분사시간(TTD)이 경과되면 솔레노이드 밸브를 구동시키기위한 명령펄스를 "OFF" 상태로 출력하는 단계를 수행함을 보이고 있다.1 is a time chart according to the present invention, which receives information on an engine speed and a target injection period A DC , reading a target injection time A θ from a map, and a response time A DR of a solenoid valve. ), Calculating the total time period (A TT ) by subtracting the target injection time (A θ ) and the response time (A DR ) from the total control time (θ1), and rotating pulse (SS) and Counting the clock pulse and outputting the command pulse for driving the solenoid valve in the "ON" state at the total time period (A TT ), the response time (T DR ) of the solenoid valve, the engine speed and load information Calculating the total injection time (T TD ) by adding the target injection time (T DC ) corresponding to the target injection time (A DC ) received from the map received from the input, and after outputting the drive current for driving the solenoid valve After the injection time (T TD ) elapses, the solenoid valve It shows that it executes the step of outputting the command pulse to the "OFF" state.

이와같은 본 발명의 작용을 설명한다.Such operation of the present invention will be described.

먼저, 도 1의 (c)에서와 같이 엔진회전수 센서에 의해 감지되어서 연산된 엔진 회전수와 목표 분사기간(ADC)의 정보를 입력받아 기저장된 맵으로부터 목표 분사시기(Aθ)를 읽어내는 한편, 연료분사를 조절하는 솔레노이드 밸브의 응답시기(ADR)를 읽어낸다.First, as shown in (c) of FIG. 1, the engine injection speed and target injection period A DC are detected and calculated by the engine speed sensor, and the target injection timing A θ is read from a pre-stored map. On the other hand, it reads the response time ( ADR ) of the solenoid valve which controls fuel injection.

그리고 수학식 1에서와 같이 총제어시기(θ1)로부터 목표 분사시기(Aθ)와 응답시기(ADR)를 감산하여 총타임시기(ATT)를 연산하게 된다.As shown in Equation 1, the total injection time A TT is calculated by subtracting the target injection time A θ and the response time A DR from the total control time θ1.

ATT=θ1-Aθ-ADR A TT = θ1-A θ -A DR

여기서, ATT는 총타임시기이고,Where A TT is the total time period,

θ1은 총제어시기이고,θ1 is the total control period,

Aθ는 목표 분사시기이며,A θ is the target injection timing,

ADR은 솔레노이드 밸브의 응답시기이다.A DR is the response time of the solenoid valve.

그리고, 도 1의 (C)와 같이 엔진회전수 센서에 의해 감지되는 회전펄스(SS)와 미도시된 클럭발생기에서 발생되는 클럭펄스를 카운팅한 결과 총타임시기(ATT)가 되면, 솔레노이드 밸브를 구동시키기위한 명령펄스를 도 1의 (D)에서와 같이 "ON" 상태로 출력하게 된다.Then, as a result of counting the rotation pulse (SS) detected by the engine speed sensor and the clock pulse generated from the clock generator not shown as shown in Figure 1 (C), when the total time period (A TT ), the solenoid valve The command pulse for driving the signal is output in the "ON" state as shown in FIG.

이에따라 솔레노이드 밸브에 흐르는 전류가 도 1의 (E)와 같이 상승되어진후 안전되면서 도 1의 (F)에서와 같이, (a)시점에서 솔레노이드 밸브가 완전히 열리면서 연소실에 연료가 분사되게 된다.Accordingly, while the current flowing through the solenoid valve is raised as shown in (E) of FIG. 1, the fuel is injected into the combustion chamber while the solenoid valve is completely opened at the time (a) as shown in FIG.

이렇게 솔레노이드 밸브를 구동시켜 연소실에 연료를 분사하면서 솔레노이드 밸브의 응답시간(TDR)과, 엔진회전수와 부하량의 정보를 입력받아 기저장된 맵으로부터 읽어낸 목표 분사시기(ADC)에 대응하는 목표 분사시간(TDC)을 수학식 2에서와 같이 가산하여 총분사시간(TTD)을 연산하게 된다.In this way, by driving the solenoid valve to inject fuel into the combustion chamber, the target corresponding to the target injection timing (A DC ) read from the prestored map by receiving the response time (T DR ) of the solenoid valve, the engine speed, and the load information The total injection time T TD is calculated by adding the injection time T DC as in Equation 2.

TTD=TDR+TDC T TD = T DR + T DC

여기서, TTD는 총분사시간이고,Where T TD is the total injection time,

TDR은 솔레노이드 밸브의 응답시간이며,T DR is the response time of solenoid valve

TDC는 목표 분사시간이다T DC is the target injection time

솔레노이드 밸브를 구동시키기위한 명령펄스를 "ON" 상태를 출력한후 이렇게 연산된 총분사시간(TTD)이 경과되면 솔레노이드 밸브를 구동시키기위한 명령펄스를 도 1의 (D)에서와 같이, "OFF" 상태로 출력하게 된다.When the total injection time T TD elapses after the command pulse for driving the solenoid valve is turned on, the command pulse for driving the solenoid valve is set as shown in FIG. OFF "status will be displayed.

이에따라 솔레노이드 밸브에 흐르는 구동전류가 도 1의 (E)에서와 같이 차단되어서 솔레노이드 밸브는 도 1의 (F)에서와 같이, (b)지점에서 닫혀져 연소실에 분사되는 연료가 차단되게 된다.Accordingly, the driving current flowing through the solenoid valve is cut off as shown in (E) of FIG. 1 so that the solenoid valve is closed at point (b), as shown in (F) of FIG. 1, to block fuel injected into the combustion chamber.

이상에서와 같이 본 발명은 총제어시기와 솔레노이드 밸브의 응답시기 그리고 목표 분사기간에 의해 분사시기를 결정하여 솔레노이드 밸브를 구동시킨후 솔레노이드 밸브의 응답시간과 목표 분사기간에 의해 설정된 기간동안 솔레노이드 밸브를 구동시켜 분사량을 조절함으로써, 연소실에 분사되는 연료의 분사시기와 분사시간이 정확하게 조절되어서 엔진출력을 향상시킴은 물론이고, 이는 더 나아가서 엔진의 안정시켜 수명을 연장할 수 있는 것이다.As described above, the present invention determines the injection timing according to the total control timing, the response timing of the solenoid valve and the target injection period, and then drives the solenoid valve to operate the solenoid valve for a period set by the response time and the target injection period of the solenoid valve. By adjusting the injection amount by driving, the injection timing and injection time of the fuel injected into the combustion chamber can be precisely adjusted to improve the engine output, which can further stabilize the engine and extend its life.

Claims (1)

엔진회전수와 목표 분사기간(ADC)의 정보를 입력받아 맵으로부터 목표 분사시기(Aθ)를 읽어내는 단계와;Reading the target injection timing A θ from the map by receiving information on the engine speed and the target injection period A DC ; 솔레노이드 밸브의 응답시기(ADR)를 읽어내는 단계;Reading the response time A DR of the solenoid valve; 총제어시기(θ1)로부터 목표 분사시기(Aθ)와 응답시기(ADR)를 감산하여 총타임시기(ATT)를 연산하는 단계;Calculating a total time period A TT by subtracting the target injection time A θ and the response time A DR from the total control time θ1; 회전펄스(SS)와 클럭펄스를 카운팅하여 총타임시기(ATT)에 솔레노이드 밸브를 구동시키기위한 명령펄스를 "ON" 상태로 출력하는 단계;Counting the rotation pulse (SS) and the clock pulse to output a command pulse for driving the solenoid valve at the total time period (A TT ) to an "ON"state; 솔레노이드 밸브의 응답시간(TDR)과 엔진회전수와 부하량의 정보를 입력받아 맵으로부터 읽어낸 목표 분사시기(ADC)에 대응하는 목표 분사시간(TDC)을 가산하여 총분사시간(TTD)을 연산하는 단계;Total injection time (T TD ) by adding the response time (T DR ) of the solenoid valve and the target injection time (T DC ) corresponding to the target injection time (A DC ) read from the map by receiving engine speed and load information. Calculating; 솔레노이드 밸브를 구동시키기위한 구동전류 출력후 총분사시간(TTD)이 경과되면 솔레노이드 밸브를 구동시키기위한 명령펄스를 "OFF" 상태로 출력하는 단계를 수행함을 특징으로 하는 내연기관의 분사시기 및 분사시간 제어방법.When the total injection time (T TD ) elapses after outputting the drive current for driving the solenoid valve, the step of outputting the command pulse for driving the solenoid valve to the “OFF” state is performed. Time control method.
KR1019970047035A 1997-09-12 1997-09-12 Method for controlling injection time of an internal combustion engine KR100271919B1 (en)

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