KR101000233B1 - Engine Control Method for Vehicle using LNG - Google Patents

Engine Control Method for Vehicle using LNG Download PDF

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KR101000233B1
KR101000233B1 KR1020080121816A KR20080121816A KR101000233B1 KR 101000233 B1 KR101000233 B1 KR 101000233B1 KR 1020080121816 A KR1020080121816 A KR 1020080121816A KR 20080121816 A KR20080121816 A KR 20080121816A KR 101000233 B1 KR101000233 B1 KR 101000233B1
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South Korea
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fuel
methane content
fuel amount
change
engine
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KR1020080121816A
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Korean (ko)
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KR20100063342A (en
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윤현중
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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
    • 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
    • F02D19/021—Control of components of the fuel supply system
    • F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • 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
    • F02D19/029—Determining density, viscosity, concentration or composition
    • 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
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0239—Pressure or flow regulators therefor
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

본 발명은 LNG 차량에서 연료탱크 내의 LNG 중 메탄이 기화되어 배출됨으로써 발생되는 연료의 성분 변화에 따라, 엔진을 그에 상응하게 제어함으로써, 엔진의 손상을 방지할 수 있도록 한다.The present invention is to control the engine according to the change of the fuel component generated by the vaporization of the methane of the LNG in the fuel tank in the LNG vehicle, it is possible to prevent damage to the engine.

노킹, 점화시기, 과급압력, 메탄 Knocking, ignition timing, boost pressure, methane

Description

엘엔지 차량의 엔진 제어방법{Engine Control Method for Vehicle using LNG}Engine Control Method for Vehicle using LNG

본 발명은 엘엔지 차량의 엔진 제어방법에 관한 것으로서, 보다 상세하게는 LNG를 연료로 사용하는 차량에서 연료탱크에 저장된 연료인 LNG(Liquefied Natural Gas)의 성분 변화에 대응하여 엔진을 보호할 수 있도록 하는 기술에 관한 것이다.The present invention relates to an engine control method of an LENG vehicle, and more particularly, to protect an engine in response to changes in the composition of LNG (Liquefied Natural Gas), which is fuel stored in a fuel tank, in a vehicle using LNG as a fuel. It's about technology.

LNG 차량이 운행하지 않는 동안, LNG가 저장되어 있는 연료탱크의 내부 압력은 연료 중의 메탄이 우선적으로 기화됨에 따라 상승하게 된다.While the LNG vehicle is not running, the internal pressure of the fuel tank where LNG is stored increases as the methane in the fuel is preferentially vaporized.

이 경우, 연료탱크의 안전밸브가 개방되어 연료탱크 내부의 기체를 외부로 배출하도록 되어 있는데, 이렇게 되면 연료 중의 메탄 성분만 빠져나가게 되어 연료탱크에 남은 연료는 에탄과 프로판의 비율이 높아져서, 열량은 높고 옥탄가는 낮은 상태가 된다.In this case, the safety valve of the fuel tank is opened to discharge the gas inside the fuel tank to the outside. This causes only the methane component in the fuel to escape, and the fuel remaining in the fuel tank increases the ratio of ethane and propane. High and octane numbers are low.

상기와 같이 열량은 높고 옥탄가는 낮은 연료가 엔진으로 유입되었을 경우에, 엔진은 연소 온도가 높아지고 노킹 등의 이상 연소가 발생되어 피스톤이 파손되는 등 엔진의 손상을 초래할 수 있다.As described above, when fuel having a high calorific value and a low octane number is introduced into the engine, the engine may cause damage to the engine, such as a high combustion temperature, abnormal combustion such as knocking, and the like.

본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, LNG 차량에서 연료탱크 내의 LNG 중 메탄이 기화되어 배출됨으로써 발생되는 연료의 성분 변화에 따라, 엔진을 그에 상응하게 제어함으로써, 엔진의 손상을 방지할 수 있도록 한 엘엔지 차량의 엔진 제어방법을 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, the engine damage according to the change of the fuel component generated by the vaporization of the methane of the LNG in the fuel tank in the LNG vehicle, the engine damage It is an object of the present invention to provide a method for controlling the engine of the LENG vehicle to prevent the.

상기한 바와 같은 목적을 달성하기 위하여 안출된 본 발명 엘엔지 차량의 엔진 제어방법은Engine control method of the present invention the L ENG vehicle designed to achieve the object as described above

주차 중 연료탱크의 연료량 변화를 검출하는 연료량변화검출단계와;A fuel amount change detection step of detecting a fuel amount change of the fuel tank during parking;

연료량이 변화한 경우, 연료량 변화에 따른 메탄함유율 변화를 구하여, 현 잔존 연료의 메탄 함유율을 구하는 메탄함유율획득단계와;A methane content acquisition step of obtaining a methane content rate of the current remaining fuel by obtaining a change in the methane content rate according to the fuel amount change when the fuel amount is changed;

상기 메탄함유율획득단계에서 구해진 연료의 메탄 함유율에 따라 엔진의 연소조건을 변화시키는 엔진연소보정단계;An engine combustion correction step of changing combustion conditions of the engine according to the methane content of the fuel obtained in the methane content acquisition step;

를 포함하여 구성된 것을 특징으로 한다.Characterized in that configured to include.

상기 연료량변화검출단계는The fuel amount change detection step

시동키가 오프시 연료탱크의 연료량센서로 연료량을 측정하는 초기연료량측정단계와; An initial fuel amount measuring step of measuring a fuel amount with a fuel amount sensor of a fuel tank when the ignition key is off;

상기 시동키가 다시 온되는 시점에 상기 연료량센서로 상기 연료탱크의 연 료량을 다시 측정하는 후기연료량측정단계와;A late fuel amount measuring step of measuring the fuel amount of the fuel tank again by the fuel amount sensor when the start key is turned on again;

상기 후기연료량과 초기연료량을 비교함으로써, 연료량의 증가, 감소 또는 불변 상태를 검출하는 검출결과산출단계를 포함하여 구성될 수 있다.Comparing the late fuel amount and the initial fuel amount, it may be configured to include a detection result calculation step of detecting the increase, decrease or invariant state of the fuel amount.

상기 메탄함유율획득단계는 The methane content acquisition step is

상기 연료량변화검출단계의 수행 결과, 연료량이 감소한 경우,When the fuel amount decreases as a result of performing the fuel amount change detecting step,

연료탱크에 연료량이 100%인 상태로 연료가 주입된 상태로부터, 경과일 수에 따른 잔존 연료율에 대한 메탄 함유율의 변화 관계를 구하는 경과일별변화획득단계와;Acquiring the change of daily elapsed time to obtain a change relation of the methane content rate with respect to the remaining fuel rate from the state in which fuel is injected into the fuel tank with 100% fuel;

상기 경과일별변화획득단계로부터의 경과일 수에 따른 메탄 함유율의 변화관계를 이용하여, 연료탱크의 연료량 감소율에 따른 잔존 연료의 메탄 함유율을 구하는 연료량별변화획득단계를 포함하여 구성될 수 있다.By using the change relationship of the methane content rate according to the number of days from the elapsed daily change acquisition step, it may include a fuel amount change acquisition step for obtaining the methane content rate of the remaining fuel according to the fuel amount decrease rate of the fuel tank.

상기 메탄함유율획득단계는The methane content acquisition step is

상기 연료량별변화획득단계에서 얻어진 연료량 감소율에 따른 잔존 연료의 메탄 함유율의 관계를 일반화하고, 주차시 연료탱크의 초기 연료량에 따른 변수를 고려하여, 주차 초기 연료량 및 연료량 감소율에 따른 잔존 연료의 메탄 함유율에 대한 3차원 특성맵을 구하는 일반화단계를 더 포함하여 구성될 수 있다.Generalizing the relationship between the methane content of the remaining fuel according to the fuel reduction rate obtained in the step of acquiring the change in fuel amount, and considering the variable according to the initial fuel amount of the fuel tank when parking, the methane content of the remaining fuel according to the initial fuel amount and the fuel reduction rate The method may further include a generalization step of obtaining a three-dimensional characteristic map for.

상기 메탄함유율획득단계는 The methane content acquisition step is

상기 연료량변화검출단계의 수행 결과, 연료량이 증가한 경우,When the fuel amount is increased as a result of performing the fuel amount change detection step,

연료탱크의 연료량 증가에 따른 메탄 함유율 변화를 시험적으로 구하여 연료 증가율에 대한 잔존 연료의 메탄함유율의 관계를 구하는 증가시변화획득단계를 포함하여 구성될 수 있다.It can be configured to include a change acquisition step of increasing the methane content of the fuel tank in accordance with the increase in the fuel amount to obtain a relationship between the fuel growth rate and the methane content of the remaining fuel.

상기 엔진연소보정단계를 수행하는 경우에는, 연료중의 메탄 함유량 변화에 따라 엔진의 연소조건이 보정됨을 운전자에게 알려주는 경고단계를 더 포함하여 구성될 수 있다.In the case of performing the engine combustion correction step, the engine combustion compensation step may further include a warning step of informing the driver that the combustion condition of the engine is corrected according to the change of the methane content in the fuel.

상기 엔진연소보정단계는The engine combustion correction step

상기 메탄함유율획득단계에서 얻어진 현 잔존 연료의 메탄 함유율에 따라 엔진의 점화시기를 보정하는 점화시기보정단계를 포함하여 구성될 수 있다.It may include an ignition timing correction step of correcting the ignition timing of the engine according to the methane content of the current remaining fuel obtained in the methane content acquisition step.

상기 엔진연소보정단계는 The engine combustion correction step

상기 메탄함유율획득단계에서 얻어진 현 잔존 연료의 메탄 함유율이 소정값 이상인 경우에는 상기 점화시기보정단계를 수행하고;Performing the ignition timing correction step when the methane content of the current remaining fuel obtained in the methane content acquisition step is equal to or greater than a predetermined value;

상기 현 잔존 연료의 메탄함유율이 상기 소정값 이하인 경우에는 엔진의 연소실로 공급되는 과급압을 잔존 연료의 상기 메탄 함유율에 따라 제한하는 과급압제한단계를 더 수행하도록 구성될 수 있다.When the methane content of the current residual fuel is less than or equal to the predetermined value, it may be configured to further perform a boost pressure limiting step of limiting the boost pressure supplied to the combustion chamber of the engine according to the methane content of the remaining fuel.

본 발명은 LNG 차량에서 연료탱크 내의 LNG 중 메탄이 기화되어 배출됨으로써 발생되는 연료의 성분 변화에 따라, 엔진을 그에 상응하게 제어함으로써, 엔진의 손상을 방지할 수 있도록 한다.The present invention is to control the engine according to the change of the fuel component generated by the vaporization of the methane of the LNG in the fuel tank in the LNG vehicle, it is possible to prevent damage to the engine.

도 1과 도 2를 참조하면, 본 발명 실시예는 주차 중 연료탱크의 연료량 변화를 검출하는 연료량변화검출단계(S10)와; 연료량이 변화한 경우, 연료량 변화에 따른 메탄함유율 변화를 구하여, 현 잔존 연료의 메탄 함유율을 구하는 메탄함유율획득단계(S20)와; 상기 메탄함유율획득단계(S20)에서 구해진 연료의 메탄 함유율에 따라 엔진의 연소조건을 변화시키는 엔진연소보정단계(S30)를 포함하여 구성된다.1 and 2, an embodiment of the present invention includes a fuel amount change detecting step (S10) of detecting a fuel amount change of a fuel tank during parking; When the fuel amount changes, obtaining a methane content change according to the fuel amount change, and obtaining a methane content rate of the current remaining fuel; Comprising the engine combustion correction step (S30) for changing the combustion conditions of the engine in accordance with the methane content of the fuel obtained in the methane content acquisition step (S20).

즉, 차량의 주차 후 시간의 경과에 따라 연료탱크의 연료량이 변화한 것에 따라, 이를 검출하여, 미리 준비되어 있는 데이터와의 비교에 의해 현재 잔존 연료에 대한 메탄 함유율을 구하여, 이에 따라 엔진을 정상적인 메탄 함유량을 가진 연료가 공급될 때와는 달리 제어함으로써, 엔진의 손상이 발생하는 것을 방지하도록 하는 것이다.That is, as the fuel amount of the fuel tank changes as time passes after the vehicle is parked, it is detected, and the methane content of the remaining fuel is obtained by comparing with the data prepared in advance, and thus the engine is operated normally. Unlike control when a fuel with methane content is supplied, the engine damage is prevented from occurring.

상기 연료량변화검출단계(S10)는 시동키가 오프시 연료탱크의 연료량센서로 연료량을 측정하는 초기연료량측정단계(S11)와, 상기 시동키가 다시 온되는 시점에 상기 연료량센서로 상기 연료탱크의 연료량을 다시 측정하는 후기연료량측정단계(S12)와, 상기 후기연료량과 초기연료량을 비교함으로써, 연료량의 증가, 감소 또는 불변 상태를 검출하는 검출결과산출단계(S13)를 포함하여 구성된다.The fuel amount change detection step (S10) is an initial fuel amount measurement step (S11) of measuring the fuel amount by the fuel amount sensor of the fuel tank when the start key is turned off, and the fuel amount sensor of the fuel tank when the start key is turned on again. The late fuel amount measuring step (S12) for measuring the fuel amount again, and the detection result calculation step (S13) for detecting the increase, decrease or invariant state of the fuel amount by comparing the late fuel amount and the initial fuel amount.

즉, 주차하고 있는 동안에 연료탱크의 연료가 줄어들었는지, 그대로 유지된 상태인지, 아니면, 주입에 의해 증가했는지를 기존의 연료량센서로 측정하여 산출하는 것이다.That is, it is calculated by measuring with the existing fuel amount sensor whether the fuel in the fuel tank is reduced, maintained as it is, or increased by injection while parked.

상기 메탄함유율획득단계(S20)는 상기 연료량변화검출단계(S10)의 수행 결과, 연료량이 감소한 경우와 연료량이 증가한 경우를 달리 취급한다.The methane content acquisition step (S20) handles the case where the fuel amount decreases and the case where the fuel amount increases as a result of performing the fuel amount change detection step (S10).

연료량이 감소한 경우에는, 도 3에 도시된 바와 같이 상기 메탄함유율획득단계(S20)는 연료탱크에 연료량이 100%인 상태로 연료가 주입된 상태로부터, 경과일 수에 따른 잔존 연료율에 대한 메탄 함유율의 변화 관계를 구하는 경과일별변화획득단계(S21)와, 상기 경과일별변화획득단계(S21)로부터의 경과일 수에 따른 메탄 함유율의 변화관계를 이용하여, 연료탱크의 연료량 감소율에 따른 잔존 연료의 메탄 함유율을 구하는 연료량별변화획득단계(S22)와, 상기 연료량별변화획득단계(S22)에서 얻어진 연료량 감소율에 따른 잔존 연료의 메탄 함유율의 관계를 일반화하고, 주차시 연료탱크의 초기 연료량에 따른 변수를 고려하여, 주차 초기 연료량 및 연료량 감소율에 따른 잔존 연료의 메탄 함유율에 대한 3차원 특성맵을 구하는 일반화단계(S23)를 포함하여 구성된다.When the amount of fuel is reduced, as shown in FIG. 3, the methane content acquisition step (S20) is performed based on the number of days remaining from the fuel injected into the fuel tank in a state in which the fuel amount is 100%. Residual fuel according to the fuel reduction rate of the fuel tank, using the change of methane content rate according to the elapsed days from the change daily acquisition step (S21) and the change daily content acquisition step (S21) for obtaining the change relationship of the content rate Generalizes the relationship between the methane content of the remaining fuel according to the fuel amount reduction rate obtained in the fuel amount change acquisition step (S22) and the fuel amount reduction rate obtained in the fuel amount change acquisition step (S22), and according to the initial fuel amount of the fuel tank when parking. Considering the variables, including the generalized step (S23) for obtaining a three-dimensional characteristic map of the methane content of the remaining fuel according to the initial fuel amount and the fuel reduction rate It is made.

이후, 상기 3차원 특성맵을 이용하여, 연료탱크의 주차 초기 연료량과 현재 연료탱크의 잔존 연료량인 후기 연료량의 차이에 따른 연료량감소율에 대한 현 잔존 연료의 메탄 함유율을 구한다.Thereafter, using the three-dimensional characteristic map, the methane content rate of the current remaining fuel to the fuel reduction rate according to the difference between the initial parking amount of the fuel tank and the late fuel amount which is the remaining fuel amount of the current fuel tank is obtained.

여기서, 상기 경과일별변화획득단계(S21)와 연료량별변화획득단계(S22) 및 상기 일반화단계(S23)는 실질적으로는 미리 실험과 해석 등에 의해 수행되어, 차량의 엔진컨트롤러가 이용할 수 있는 상태로 데이터화 되어 입력되어 있는 상태로 하는 것이고, 차량의 운행중에는 연료량센서로 측정한 주차 초기 연료량과, 시동키가 온된 시점의 후기 연료량을 측정하여 상기 초기 연료량과의 차이에 의해 구해지는 연료량 감소율에 의해 잔존 연료의 메탄 함유율을 구하는 것이다.Here, the elapsed daily change acquisition step (S21), the change acquisition amount by fuel amount (S22), and the generalization step (S23) are substantially performed by experiment and analysis in advance, so that the engine controller of the vehicle can be used. Data is inputted, and while the vehicle is in operation, the initial fuel amount measured by the fuel level sensor and the late fuel amount measured at the time when the ignition key is turned on are stored according to the fuel amount reduction rate determined by the difference between the initial fuel amount. The methane content of the fuel is obtained.

한편, 상기 연료량변화검출단계(S10)의 수행 결과, 연료량이 증가한 경우에는, 도 4에 도시된 바와 같이 상기 메탄함유율획득단계(S20)는 연료탱크의 연료량 증가에 따른 메탄 함유율 변화를 시험적으로 구하여 연료 증가율에 대한 잔존 연료의 메탄함유율의 관계를 구하는 증가시변화획득단계(S24)를 포함하여 구성된다.On the other hand, when the fuel amount is increased as a result of performing the fuel amount change detection step (S10), as shown in Figure 4, the methane content acquisition step (S20) is a test of the change in the methane content rate in accordance with the increase in the fuel amount of the fuel tank experimentally It is configured to include an increase acquisition step (S24) to obtain a relationship between the methane content of the remaining fuel to the fuel growth rate.

즉, 연료탱크에 연료를 주입하면, 연료량이 증가하게 되므로, 주차한 상태에서 연료의 주입이 있었던 경우에는, 상기한 바와 같이 증가시변화획득단계(S24)에서 구해진 관계를 이용하여, 연료량 증가율에 따른 현 잔존 연료의 메탄 함유율을 구하는 것이다.That is, when fuel is injected into the fuel tank, the amount of fuel is increased. Therefore, when fuel is injected while parked, the fuel amount increase rate is increased by using the relationship obtained in the increase acquisition step S24 as described above. To calculate the methane content of the remaining fuel.

물론, 상기 증가시변화획득단계(S24)도 미리 실험과 해석 등에 의하여 수행되어 데이터화 되어 상기 엔진컨트롤러가 사용할 수 있는 상태로 입력되어 있도록 하는 것이다.Of course, the increase acquisition step (S24) during the increase is also performed in advance by experiments and analysis, such that the data is input so that the engine controller can be used.

상기 엔진연소보정단계(S30)는 상기 메탄함유율획득단계(S20)에서 얻어진 현 잔존 연료의 메탄 함유율에 따라 엔진의 점화시기를 보정하는 점화시기보정단계(S31)를 포함하여 구성된다.The engine combustion correction step (S30) comprises an ignition timing correction step (S31) for correcting the ignition timing of the engine according to the methane content rate of the current remaining fuel obtained in the methane content acquisition step (S20).

즉, 현 잔존 연료의 메탄 함유율이 정상보다 낮은 경우에 그에 정도에 따라 점화시기를 지연시켜서 엔진의 연소온도가 지나치게 높아지거나 노킹이 발생하는 것을 방지하도록 하는 것이다.That is, when the methane content of the current remaining fuel is lower than normal, the ignition timing is delayed accordingly to prevent the combustion temperature of the engine from becoming too high or knocking occurs.

특히, 본 실시예에서 상기 엔진연소보정단계(S30)는 상기 메탄함유율획득단계(S20)에서 얻어진 현 잔존 연료의 메탄 함유율이 소정값 이상인 경우에는 상기 점화시기보정단계(S31)를 수행하고, 상기 현 잔존 연료의 메탄함유율이 상기 소정값 이하인 경우에는 엔진의 연소실로 공급되는 과급압을 잔존 연료의 상기 메탄 함유율에 따라 제한하는 과급압제한단계(S32)를 수행하도록 구성하였다.In particular, the engine combustion correction step (S30) in the present embodiment performs the ignition timing correction step (S31) when the methane content rate of the current remaining fuel obtained in the methane content acquisition step (S20) is a predetermined value or more, and When the methane content of the current residual fuel is less than or equal to the predetermined value, it is configured to perform a boost pressure limiting step (S32) of limiting the boost pressure supplied to the combustion chamber of the engine according to the methane content of the remaining fuel.

즉, 상기 잔존 연료의 메탄 함유율이 점화시기 보정만으로는 엔진을 보호하기에 미흡하다고 판단되는 경우에, 터보차져를 통해 엔진으로 공급되는 과급압을 상기 메탄 함유율이 낮아짐에 따라 더 제한하도록 제어하여 엔진의 출력제한을 통해 엔진의 손상을 방지하고 엔진을 보호할 수 있도록 한 것이다.That is, when it is determined that the methane content of the remaining fuel is insufficient to protect the engine only by the ignition timing correction, the supercharge pressure supplied to the engine through the turbocharger is controlled to be further restricted as the methane content decreases. The power limit prevents engine damage and protects the engine.

여기서, 상기 과급압제한단계(S32)의 수행여부를 판단하는 소정값은 미리 실험에 의하여, 당해 차량에 탑재되는 엔진 모델에 있어서, 그 손상을 방지할 수 있는 수준으로 미리 설정되는 값이다.Here, the predetermined value for determining whether the boost pressure limiting step (S32) is performed is a value which is set in advance to a level that can prevent the damage in the engine model mounted on the vehicle by experiment in advance.

물론, 상기 과급압제한은 상기 점화시기보정과 동시에 수행하도록 할 수도 있을 것이다. Of course, the boost pressure limit may be performed at the same time as the ignition timing correction.

한편, 상기 엔진연소보정단계(S30)를 수행하는 경우에는, 연료중의 메탄 함유량 변화에 따라 엔진의 연소조건이 보정됨을 운전자에게 알려주는 경고단계를 더 수행하도록 하여, 운전자로 하여금 적절한 조치를 취할 수 있도록 한다.On the other hand, when performing the engine combustion correction step (S30), by performing a warning step for notifying the driver that the combustion conditions of the engine is corrected according to the change in the methane content in the fuel, the driver to take appropriate measures To help.

상기 경고단계는 엔진경고등을 점등하거나 안내 멘트와 같은 소리정보를 제공하거나 하는 등의 방법을 사용할 수 있음은 물론이다.The warning step may of course use a method such as turning on the engine warning lights or providing sound information such as announcements.

본 발명은 상기한 바와 같이 미리 연료탱크의 연료량 변화에 따른 잔존 연료 중의 메탄 함유량에 대한 정보를 얻어 그에 상응하게 엔진의 점화시기를 지각시키거나 과급압을 제한 하는 등의 조치를 취함으로써, 엔진의 고온 연소 및 노킹 등으로 인한 엔진 손상을 미연에 방지할 수 있다.As described above, the present invention obtains information on the methane content in the remaining fuel according to the change in fuel amount of the fuel tank in advance, and takes measures such as retarding the ignition timing of the engine or limiting the supercharge pressure accordingly. Engine damage due to high temperature combustion and knocking can be prevented in advance.

도 1은 본 발명에 따른 엘엔지 차량의 엔진 제어방법을 설명한 도면,1 is a view illustrating an engine control method of an LENG vehicle according to the present invention;

도 2와 도 3은 도 1의 메탄함유율획득단계를 구체적으로 설명한 도면이다.2 and 3 are views illustrating the methane content acquisition step of FIG. 1 in detail.

<도면의 주요 부분에 대한 부호의 간단한 설명><Brief description of symbols for the main parts of the drawings>

S10; 연료량변화검출단계 S20; 메탄함유율획득단계S10; Fuel amount change detection step S20; Methane content acquisition stage

S30; 엔진연소보정단계 S11; 초기연료량측정단계S30; Engine combustion correction step S11; Initial fuel quantity measurement stage

S12; 후기연료량측정단계 S13; 검출결과산출단계S12; Late fuel amount measurement step S13; Detection result calculation step

S21; 경과일별변화획득단계 S22; 연료량별변화획득단계S21; Elapsed daily change acquisition step S22; Acquisition stage by fuel amount

S23; 일반화단계 S24; 증가시변화획득단계S23; Generalization step S24; Change acquisition phase at increase

S31; 점화시기보정단계 S32; 과급압제한단계S31; Ignition timing correction step S32; Supercharge limit stage

Claims (8)

주차 중 연료탱크의 연료량 변화를 검출하는 연료량변화검출단계와;A fuel amount change detection step of detecting a fuel amount change of the fuel tank during parking; 연료량이 변화한 경우, 연료량 변화에 따른 메탄함유율 변화를 구하여, 현 잔존 연료의 메탄 함유율을 구하는 메탄함유율획득단계와;A methane content acquisition step of obtaining a methane content rate of the current remaining fuel by obtaining a change in the methane content rate according to the fuel amount change when the fuel amount is changed; 상기 메탄함유율획득단계에서 구해진 연료의 메탄 함유율에 따라 엔진의 연소조건을 변화시키는 엔진연소보정단계;An engine combustion correction step of changing combustion conditions of the engine according to the methane content of the fuel obtained in the methane content acquisition step; 를 포함하여 구성된 것을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LENG vehicle, characterized in that configured to include. 청구항 1에 있어서, 상기 연료량변화검출단계는The method of claim 1, wherein the fuel amount change detection step 시동키가 오프시 연료탱크의 연료량센서로 연료량을 측정하는 초기연료량측정단계와; An initial fuel amount measuring step of measuring a fuel amount with a fuel amount sensor of a fuel tank when the ignition key is off; 상기 시동키가 다시 온되는 시점에 상기 연료량센서로 상기 연료탱크의 연료량을 다시 측정하는 후기연료량측정단계와;A late fuel amount measuring step of measuring the fuel amount of the fuel tank again by the fuel amount sensor when the start key is turned on again; 상기 후기연료량과 초기연료량을 비교함으로써, 연료량의 증가, 감소 또는 불변 상태를 검출하는 검출결과산출단계;A detection result calculation step of detecting an increase, a decrease or an invariant state of the fuel amount by comparing the late fuel amount with the initial fuel amount; 를 포함하여 구성된 것을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LENG vehicle, characterized in that configured to include. 청구항 1에 있어서, 상기 메탄함유율획득단계는 The method of claim 1, wherein the methane content acquisition step 상기 연료량변화검출단계의 수행 결과, 연료량이 감소한 경우,When the fuel amount decreases as a result of performing the fuel amount change detecting step, 연료탱크에 연료량이 100%인 상태로 연료가 주입된 상태로부터, 경과일 수에 따른 잔존 연료율에 대한 메탄 함유율의 변화 관계를 구하는 경과일별변화획득단계와;Acquiring the change of daily elapsed time to obtain a change relation of the methane content rate with respect to the remaining fuel rate from the state in which fuel is injected into the fuel tank with 100% fuel; 상기 경과일별변화획득단계로부터의 경과일 수에 따른 메탄 함유율의 변화관계를 이용하여, 연료탱크의 연료량 감소율에 따른 잔존 연료의 메탄 함유율을 구하는 연료량별변화획득단계;A fuel amount change acquiring step of obtaining a methane content rate of remaining fuel according to a fuel amount decrease rate of a fuel tank by using a change relationship of methane content rate according to the number of elapsed days from the elapsed daily change acquisition step; 를 포함하여 구성된 것을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LENG vehicle, characterized in that configured to include. 청구항 3에 있어서, 상기 메탄함유율획득단계는The method of claim 3, wherein the methane content acquisition step 상기 연료량별변화획득단계에서 얻어진 연료량 감소율에 따른 잔존 연료의 메탄 함유율의 관계를 일반화하고, 주차시 연료탱크의 초기 연료량에 따른 변수를 고려하여, 주차 초기 연료량 및 연료량 감소율에 따른 잔존 연료의 메탄 함유율에 대한 3차원 특성맵을 구하는 일반화단계를 더 포함하여 구성된 것Generalizing the relationship between the methane content of the remaining fuel according to the fuel reduction rate obtained in the step of acquiring the change in fuel amount, and considering the variable according to the initial fuel amount of the fuel tank when parking, the methane content of the remaining fuel according to the initial fuel amount and the fuel reduction rate Further comprising a generalization step of obtaining a three-dimensional characteristic map for 을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LNG vehicle, characterized in that. 청구항 3에 있어서, 상기 메탄함유율획득단계는 The method of claim 3, wherein the methane content acquisition step 상기 연료량변화검출단계의 수행 결과, 연료량이 증가한 경우,When the fuel amount is increased as a result of performing the fuel amount change detection step, 연료탱크의 연료량 증가에 따른 메탄 함유율 변화를 시험적으로 구하여 연료 증가율에 대한 잔존 연료의 메탄함유율의 관계를 구하는 증가시변화획득단계;Acquiring the change of the methane content according to the increase of the fuel amount in the fuel tank to obtain the change in the increase time to obtain the relationship between the fuel growth rate and the methane content of the remaining fuel; 를 포함하여 구성된 것을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LENG vehicle, characterized in that configured to include. 청구항 1에 있어서,The method according to claim 1, 상기 엔진연소보정단계를 수행하는 경우에는, 연료중의 메탄 함유량 변화에 따라 엔진의 연소조건이 보정됨을 운전자에게 알려주는 경고단계를 더 포함하여 구성된 것In the case of performing the engine combustion correction step, the engine combustion compensation step further includes a warning step of informing the driver that the combustion condition of the engine is corrected according to the change of the methane content in the fuel. 을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LNG vehicle, characterized in that. 청구항 1에 있어서, 상기 엔진연소보정단계는The method of claim 1, wherein the engine combustion correction step 상기 메탄함유율획득단계에서 얻어진 현 잔존 연료의 메탄 함유율에 따라 엔진의 점화시기를 보정하는 점화시기보정단계;An ignition timing correction step of correcting an ignition timing of the engine according to the methane content rate of the current remaining fuel obtained in the methane content acquisition step; 를 포함하여 구성된 것을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LENG vehicle, characterized in that configured to include. 청구항 7에 있어서, 상기 엔진연소보정단계는 The method of claim 7, wherein the engine combustion correction step 상기 메탄함유율획득단계에서 얻어진 현 잔존 연료의 메탄 함유율이 소정값 이상인 경우에는 상기 점화시기보정단계를 수행하고;Performing the ignition timing correction step when the methane content of the current remaining fuel obtained in the methane content acquisition step is equal to or greater than a predetermined value; 상기 현 잔존 연료의 메탄함유율이 상기 소정값 이하인 경우에는 엔진의 연소실로 공급되는 과급압을 잔존 연료의 상기 메탄 함유율에 따라 제한하는 과급압제한단계를 더 수행하도록 구성된 것And configured to further perform a boost pressure limiting step of limiting the boost pressure supplied to the combustion chamber of the engine according to the methane content rate of the remaining fuel when the methane content rate of the current residual fuel is equal to or less than the predetermined value. 을 특징으로 하는 엘엔지 차량의 엔진 제어방법.Engine control method of the LNG vehicle, characterized in that.
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