KR100222852B1 - Fuel injection control method - Google Patents

Fuel injection control method Download PDF

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Publication number
KR100222852B1
KR100222852B1 KR1019960036852A KR19960036852A KR100222852B1 KR 100222852 B1 KR100222852 B1 KR 100222852B1 KR 1019960036852 A KR1019960036852 A KR 1019960036852A KR 19960036852 A KR19960036852 A KR 19960036852A KR 100222852 B1 KR100222852 B1 KR 100222852B1
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South Korea
Prior art keywords
fuel
injection
amount
rpm
correction
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KR1019960036852A
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Korean (ko)
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KR19980017101A (en
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김광준
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정몽규
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
    • F02D41/30—Controlling fuel injection
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • 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 엔진에 걸리는 부하에 따라 연료 재분사시 보정량을 구분하여 분사하여 정밀도가 높고 응답성이 좋은 분사 시스템을 제공하는 인젝터의 연료 재분사시 분사량 보정방법에 있어서, 연료공급이 중단된 상태에서 연료의 재분사 시점을 검출하기 위해 RPM을 판독하여 목표RPM과 비교 판단하는 단계와; 연료의 재분사 시점상태가 되면 분사량 보정시 엔진에 걸리는 부하와 관련하여 보정량을 설정하기 위해 현 변속단 위치를 판독하는 단계와; 변속단 판독이 완료되면 해당 변속단 부하 상태에 따라 재분사량을 구부하여 보정하는 단계로 이루어져 있는 연료 분사 제어 방법에 관한 것이다.The present invention relates to a method for correcting an injection quantity of a fuel injector for injecting fuel in a fuel injector, the injector correcting an amount of correction during a fuel re-injection according to a load applied to the engine to provide a highly precise and responsive injection system, Reading the RPM to detect the timing of re-injection of the fuel and comparing the RPM with the target RPM; Reading the current gear position to set a correction amount in relation to a load applied to the engine in correcting the injection amount when the fuel is in the re-injection timing state; And when the reading of the speed change stage is completed, bending the re-injection amount according to the state of the corresponding speed change stage load to correct the fuel injection control method.

Description

연료 분사 제어 방법Fuel injection control method

제1도는 본 발명의 실시예에 따른 연료 분사 제어 방법에 관한 블록도이고,FIG. 1 is a block diagram of a fuel injection control method according to an embodiment of the present invention,

제2도는 본 발명의 실시예에서 제시되는 연료 재분사량 보정에 관한 순서도이다.FIG. 2 is a flow chart of the fuel re-injection amount correction proposed in the embodiment of the present invention.

[산업상의 이용분야][Industrial Applications]

본 발명은 전자 제어 자동차에서, 연료 분사량 제어 방법에 관한 것으로 더욱 상세하게는 연료 공급 차단후 재분사되는 연료의 보정량이 엔진(engine)에 걸리는 부하에 따라 분류되어 이론 공연비에 적합한 재분사가 이루어지도록 하기 위한 연료 분사 제어 방법에 관한 것이다.The present invention relates to a fuel injection quantity control method in an electronically controlled vehicle, and more particularly, to a fuel injection quantity control method for an electronically controlled vehicle, in which a correction amount of fuel to be re-injected after fuel supply cutoff is classified according to a load applied to the engine, Fuel injection control method.

[종래 기술]BACKGROUND ART [0002]

보통 엔진의 회전 속도가 일정한 속도 이상의 RPM(revolution per minute)으로 상승하였을 때 그 이상의 RPM이 증가하지 않도록 연료 공급을 중지하거나 스로틀 밸브(throttle valve)가 닫힘과 동시에 메인 라인에 가솔린(gasoline) 공급을 멈추고 흡기압이 상승하여 자연 공급이 중지될 때까지 그 동안에 필요없이 소비되는 연료를 절약함과 동시에 여분의 탄화 수소에 의한 촉매의 온도 상승을 막기 위해 연료 공급을 차단하는 경우가 있다.Normally, when the rotational speed of the engine rises to a revolution speed per minute (RPM) or more, the fuel supply is stopped so that the RPM does not increase, or the gasoline is supplied to the main line at the same time as the throttle valve is closed The fuel supply may be shut off in order to save fuel unnecessarily consumed in the meantime and to prevent the temperature of the catalyst from rising due to excess hydrocarbon until the intake pressure rises and the natural supply is stopped.

이러한 경우 연료의 재분사량에 대한 보정 작업이 수반되고 그 방식은 제2도와 같다.In this case, correction of the amount of fuel re-injection is followed and the method is the same as the second.

전술한 바와 같은 이유로 하여 연료 분사가 중지된 상태이면 ECU(electronic control unit: 이하 'ECU' 라 약칭함:10)는 RPM 센서(22)로부터 정보를 입수하여 현재 RPM을 판독하고 목표 RPM과 비교하여 연료 재분사 시점을 검출한다.When the fuel injection is stopped for the reasons described above, an electronic control unit (ECU) 10 obtains information from the RPM sensor 22 to read the current RPM and compares the current RPM with the target RPM Fuel injection timing is detected.

이때 연료 재분사시 기본 분사량외에도 스로틀 밸브 포지션 센서(throttle valve position sensor:20) 및 수온센서(21)의 신호에 따른 보조증량이 산출되어 재분사에 해당하는 보정 작업이 이루어진다.At this time, in addition to the basic injection amount at the time of fuel re-injection, a supplementary increase amount corresponding to the signals of the throttle valve position sensor 20 and the water temperature sensor 21 is calculated and a correction operation corresponding to the re-injection is performed.

[본 발명이 해결하려는 문제점][Problems to be solved by the present invention]

그러나, 연료 재분사 보정량이 엔진에 걸리는 각 해당 변속단의 부하와 관계없이 산출되므로 운전 응답성이 떨어진다.However, since the fuel re-injection correction amount is calculated irrespective of the load of each of the corresponding gear stages engaged in the engine, the operational response is degraded.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 본 발명은 연료 재분사시 보정되는 연료 분사량을 부하상태에 따라 달리하여 연료 분사가 각 해당 변속단의 부하를 감안한 보정이 이루어짐으로써 운전 응답성을 향상시키는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a fuel injection control apparatus and a fuel injection control method thereof that corrects a fuel injection amount, The purpose is to improve sex.

[문제점을 해결하기 위한 수단][MEANS FOR SOLVING THE PROBLEM]

상기와 같은 목적을 달성하기 위하여, 본 발명은 연료 공급 중단후에 이어지는 인젝터의 연료 재분사시 분사량 보정방법에 있어서, 연료공급이 중단된 상태에서 연료의 재분사 시점을 검출하기 위해 RPM을 판독하여 목표RPM과 비교판단하는 단계와; 연료의 재분사 시점상태가 되면 분사량 보정시 엔진에 걸리는 부하와 관련하여 보정량을 설정하기 위해 현 변속단 위치를 판독하는 단계와; 변속단 판독이 완료되면 해당 변속단 부하 상태에 따라 재분사량을 구분하여 보정하는 단계로 이루어져 있다.In order to achieve the above object, the present invention provides a method for correcting an injection amount of a fuel injected from a fuel injector after fuel supply interruption, comprising: reading RPM to detect a time point at which fuel is re- Comparing with the RPM; Reading the current gear position to set a correction amount in relation to a load applied to the engine in correcting the injection amount when the fuel is in the re-injection timing state; And when the reading of the speed change stage is completed, the step of discriminating and correcting the re-injection amount according to the state of the corresponding speed change stage load.

[실시예][Example]

이하, 첨부된 도면을 참조로 하여 본 발명의 가장 바람직한 실시예를 상세히 설명한다.Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 구성을 제1도를 참고로 하여 설명하면 다음과 같다.The construction of the present invention will be described with reference to FIG.

연료 분사의 전반적인 제어를 담당하는 ECU(10)와, 스로틀 밸브 포지션 센서(20), 수온 센서(21), RPM 센서(22), TCU(transmission control unit:30), 인젝터(injector:40)로 이루어져 있다.(ECU) 10 for controlling the fuel injection and a control unit for controlling the operation of the engine 10 such as a throttle valve position sensor 20, a water temperature sensor 21, an RPM sensor 22, a transmission control unit (TCU) 30 and an injector 40 consist of.

연료 재분사시 각종 보조 증량을 연산하도록 구성되어 있는 ECU(10)는 각 센서에서 보내오는 정보로부터 그때에 필요한 공연비 즉 흡기온 증량 보정, 수온 증량 보정, 시동 증량 보정, 시동후 증량 보정, 풀(full)증량 보정, 아프터 아이들(after idle) 증량 보정을 판단하여 가솔린의 필요량을 분할하여 그것에 따른 연료 인젝터(40)의 개변시간을 결정한다.The ECU 10, which is configured to calculate the various auxiliary amount of fuel at the time of fuel re-injection, calculates the air-fuel ratio required at that time from the information sent from each sensor, that is, correction of intake air amount increase, correction of water temperature increase amount, start increase amount correction, full increase correction and after idle increase correction are determined to divide the required amount of gasoline and determine the modification time of the fuel injector 40 accordingly.

스로틀 밸브 포지션 센서(20)는 연료 분사 보정을 위하여 풀증량과 아프터 아이들 증량 보정의 신호원이 되어 ECU(10)에 정보를 보낸다.The throttle valve position sensor 20 sends information to the ECU 10 as a signal source for the fuel increase correction and the override id increase correction for the fuel injection correction.

수온 센서(21)는 연료 분사 보정을 위하여 수온 증량 보정, 시동 증량 보정, 시동후 증량 보정, 아프터 아이들 증량 보정의 신호원이 되어 ECU(10)에 정보를 보낸다.The water temperature sensor 21 sends information to the ECU 10 as a signal source for the water temperature increase correction, the start increase correction, the post-start increase correction, and the after-id increase correction for fuel injection correction.

RPM 센서(22)는 ECU(10)가 현RPM과 목표 RPM을 비교 판단하여 연료 재분사 시점을 인지하도록 한다.The RPM sensor 22 causes the ECU 10 to compare the current RPM with the target RPM to recognize the fuel re-injection timing.

TCU(30)는 엔진에 걸리는 부하에 따라 ECU(10)에서의 연료 재분사량 보정을 분류할 수 있도록 정보를 ECU(10)로 보낸다.The TCU 30 sends information to the ECU 10 so as to classify the fuel re-injection quantity correction in the ECU 10 according to the load on the engine.

인젝터(40)는 ECU(30)로부터 인가되는 신호에 따라 각각의 실린더측에 분사되는 연료량을 조절한다.The injector 40 regulates an amount of fuel injected to each cylinder side in accordance with a signal applied from the ECU 30. [

전술한 바와 같은 기능을 구비하여 이루어지는 본 발명의 동작을 첨부된 도면 제2도를 참고로 하여 설명한다.The operation of the present invention having the above-described functions will be described with reference to FIG. 2 of the accompanying drawings.

자동차의 전반적인 제어를 담당하는 ECU(10)에서는 인가되는 각 센서의 신호에 대한 기준 데이터를 분석하여 연료 공급 중단 여부를 판단한다(S11).The ECU 10, which is responsible for overall control of the vehicle, analyzes the reference data for the signals of the respective sensors to determine whether the fuel supply is stopped (S11).

상기 S11에서 연료 공급 중단 상태로 판독되면 연료의 재분사 시점을 찾기 위해 RPM 센서(22)로부터 현재 RPM을 검출하여(S12) 목표 RPM과 비교 판단한다(S13).If it is determined in S11 that the fuel supply is interrupted, the current RPM is detected from the RPM sensor 22 in order to find the timing of re-injection of the fuel (S12) and compared with the target RPM (S13).

상기 S13에서 현재 RPM이 목표 RPM보다 작은 경우 즉 연료의 재분사를 필요로 하는 시점에서 연료의 재분사 보정량을 엔진 부하에 따라 분류하기 위해 TCU(30)로부터 현변속단을 판독하고(S20), N/D단 중 어떤 변속단에 해당하는가를 비교 판단한다(S21).In S13, if the present RPM is smaller than the target RPM, that is, when the fuel re-injection is necessary, the present speed is read from the TCU 30 to classify the fuel re-injection correction amount according to the engine load (S20) / D (step S21).

상기 S21에서 판단된 변속단 위치에 따라 스로틀 밸브 포지션 센서(20)와 수온센서(21)로부터 정보를 입력받아 부하가 작은 N단일 경우 N단에 해당하는 보정량을 산출하여(S22), 그에 해당하는 소정의 제어신호를 인젝터(40)에 인가하여 실린더에 분사하는 연료량을 이론 공연비로 보정한다.Information is received from the throttle valve position sensor 20 and the water temperature sensor 21 in accordance with the gear position determined at S21 to calculate a correction amount corresponding to the N-th stage when the load is small (S22) A predetermined control signal is applied to the injector 40 to correct the amount of fuel injected into the cylinder to the stoichiometric air-fuel ratio.

그리고, 상기 S21에서 부하가 큰 D단으로 판단될 경우 D단에 해당하는 보정량을 산출하여(S23) 그에 해당하는 소정의 제어신호를 인젝터(40)에 인가하여 실린더에 분사하는 연료량을 이론 공연비로 보정한다.If it is determined in step S21 that the load is a large D-stage, a correction amount corresponding to the D-stage is calculated (S23), and a predetermined control signal corresponding to the correction amount is applied to the injector 40 to determine the amount of fuel injected into the cylinder as the stoichiometric air- .

[발명의 효과][Effects of the Invention]

상기에서 설명한 바와 같이 본 발명은 연료 공급 중단후 수행되는 연료 재분사시, 재분사 보정량을 엔진에 걸리는 부하에 따라 구분하여 분사함으로써 정밀도가 높고 응답성이 좋은 분사 시스템을 제공한다.As described above, the present invention provides a highly accurate and responsive injection system by separately injecting a re-injection correction amount according to a load applied to an engine at the time of fuel re-injection performed after stopping the fuel supply.

Claims (1)

인젝터의 연료 재분사시 분사량 보정방법에 있어서, 연료공급이 중단된 상태에서 연료의 재분사 시점을 검출하기 위해 RPM을 판독하여 목표RPM과 비교판단하는 단계와; 연료의 재분사 시점상태가 되면 분사량 보정시 엔진에 걸리는 부하와 관련하여 보정량을 설정하기 위해 현 변속단 위치를 판독하는 단계와; 변속단 판독이 완료되면 해당 변속단 부하 상태에 따라 재분사량을 구분하여 보정하는 단계로 이루어져 있는 연료 분사 제어 방법.A method for correcting an injection amount upon fuel re-injection of an injector, the method comprising the steps of: reading the RPM to compare the target RPM with the target RPM in order to detect the time point of re- Reading the current gear position to set a correction amount in relation to a load applied to the engine in correcting the injection amount when the fuel is in the re-injection timing state; And when the reading of the speed change stage is completed, correcting the re-injection amount according to the state of the corresponding speed change stage load.
KR1019960036852A 1996-08-30 1996-08-30 Fuel injection control method KR100222852B1 (en)

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