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DE102006057177A1 - Stochiometric combustion air fuel ratio and fuel injection period determining method for internal combustion engine i.e. Otto engine, involves calculating fuel injection period by using liquid gas-density and fuel pressure from valve - Google Patents

Stochiometric combustion air fuel ratio and fuel injection period determining method for internal combustion engine i.e. Otto engine, involves calculating fuel injection period by using liquid gas-density and fuel pressure from valve Download PDF

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DE102006057177A1
DE102006057177A1 DE102006057177A DE102006057177A DE102006057177A1 DE 102006057177 A1 DE102006057177 A1 DE 102006057177A1 DE 102006057177 A DE102006057177 A DE 102006057177A DE 102006057177 A DE102006057177 A DE 102006057177A DE 102006057177 A1 DE102006057177 A1 DE 102006057177A1
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fuel
density
fuel injection
pressure
injection period
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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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
    • 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
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or 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
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low 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
    • 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
    • F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
    • 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
    • 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
    • F02D2200/0611—Fuel type, fuel composition or fuel quality
    • F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
    • 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
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The method involves measuring fuel pressure and temperature of a liquid gas (13) stored in a liquid gas tank (1) by a sensor (17) before starting an internal combustion engine. The measured pressure and temperature are compared with values of vaporization pressure characteristic field of propane and butane and propane-butane-mixture, where the values are stored in a fuel injection controller (16). A fuel injection period is calculated by using liquid gas-density and the fuel pressure from a fuel injection valve (8).

Description

Die Erfindung betrifft ein Verfahren zur Ermittlung des stöchiometrischen Verbrennungsluft-Kraftstoffverhältnis von Flüssiggas in flüssigem Aggregatzustand (LPI = Liquid-Propane-Injection) zur Einspitzung in einen Otto-Motor, bei dem vor dem Motorstart das Propan-Butan-Mengenverhältnis des Flüssiggases ermittelt wird, das zusammen mit einem weiteren Kraftstoffdruck- oder -temperaturwert, gemessen an den Einspritzventile oder nahe daran oder, im Falle einer Hochdruckdirekteinspritzung, nahe der Niederdruckkammer der Hochdruckeinspritzpumpe, die Berechnung der realen Dichte des Flüssiggases möglich macht, mit deren Hilfe die Einspritzsteuerung die Öffnungszeit des Kraftstoffeinspritzventils berechnet, die notwendig ist um das stöchiometrische Verbrennungsluft-Kraftstoffverhältnis zu erzeugen.The The invention relates to a method for determining the stoichiometric Combustion air-fuel ratio of liquefied gas in liquid state (LPI = Liquid-Propane-Injection) for injection into a gasoline engine, at the before the engine start, the propane-butane ratio of the liquefied gas determined together with another fuel pressure or temperature, measured at the injectors or near or, in the case of direct high pressure injection, close to Low pressure chamber of the high pressure injection pump, the calculation of real density of liquefied gas possible makes, with the help of the injection control the opening time calculated by the fuel injection valve, which is necessary to the stoichiometric Combustion air-fuel ratio too produce.

Stand der TechnikState of the art

Im Allgemeinen wird Flüssiggas aus einem Flüssiggastank in einen Verdampfer geführt und dort verdampft, um von dort aus durch eine Mischvorrichtung, typischerweise eine sequentielle Einblasung in den Ansaugkanal, mit Verbrennungsluft vermischt, in den Zylinder eingebracht zu werden.in the Generally, LPG from a liquefied gas tank led into an evaporator and there evaporates to from there by a mixing device, typically a sequential injection into the intake duct, mixed with combustion air, to be introduced into the cylinder.

Diese Systeme sind bauaufwendig, thermodynamisch ungünstiger und von der Steuerung her weniger genau als LPI-Systeme.These Systems are structurally complex, thermodynamically unfavorable and of the control less accurate than LPI systems.

LPI-Systeme hingegen spritzen den Kraftstoff flüssig ein, entweder in den Ansaugkanal oder direkt in den Zylinder.LPI systems however, inject the fuel liquid, either in the intake or directly into the cylinder.

Stand der Technik bei der Einbringung von Flüssiggas in flüssigem Aggregatzustand in den Ansaugkanal bei Ottomotoren sind Systeme, die zusätzlich zu einem System zur Einspritzung von Ottokraftstoff der bei Normaldruck flüssig ist (Normaldruckottokraftstoff), wie Benzin oder Ethanol, einschließlich der zugehörigen Kraftstoffzuführungseinrichtung, wie Tank, Kraftstoffpumpe, Kraftstoffzuführungsleitung, Kraftstoffdruckregler, ein zweites paralleles Einspritzsystem, mit eigener Flüssiggasrail und Flüssiggaseinspritzventilen für den Kraftstoff Flüssiggas, aufweisen, das mit einer eigenen, aus einem Flüssiggastank gespeisten, Kraftstoffzuführungseinrichtung, einschließlich Kraftstoffzuführungsleitung versehen ist und auch eine eigene Kraftstoffrücklaufleitung besitzt. Die Flüssiggaseinspritzventile sind nahe den Einspritzventilen für den Normaldruckottokraftstoff im Ansaugkrümmer der Verbrennungskraftmaschine positioniert.was standing the technology in the introduction of liquefied gas in liquid state Into the intake passage in gasoline engines are systems in addition to a system for the injection of petrol at normal pressure liquid is (normal pressure fuel), such as gasoline or ethanol, including the associated Fuel supply device, such as tank, fuel pump, fuel supply line, fuel pressure regulator, a second parallel injection system, with its own liquid gas rail and LPG injection valves for the Fuel LPG, equipped with its own, fed from a liquefied gas tank, fuel supply device, including Provided fuel supply line is and also has its own fuel return line. The LPG injectors are near the injectors for the normal pressure diesel fuel in the intake manifold positioned the internal combustion engine.

Das Flüssiggaskraftstoffsystem arbeitet analog dem Einspritzsystem für Normaldruckottokraftstoffe. Eine im Flüssiggastank befindliche Kraftstoffpumpe drückt das flüssige Flüssiggas mit einem flüssiggasspezifischen Betriebsdruck, der sich aus dem Verdampfungsdruck des Flüssiggases plus dem Regeldruck des Druckreglers im Kraftstoffrücklauf zusammensetzt, zu den Flüssiggaseinspritzventilen, die von dem Flüssiggassteuergerät angesteuert werden. Überschüssiges Flüssiggas wird über eine Rücklaufleitung zum Flüssiggastank zurückbefördert. Ein im Flüssiggaskraftstoffkreislauf installierter Druckregler stellt den Systemdruck ein. Das Flüssiggassteuergerät verwendet die von der Einspritzregelung des Normaldruckkraftstoffes erzeugten Signale als Eingangssignale für seine eigenen Programme mit denen es die Flüssiggaseinspritzventile steuert.The LPG fuel system works in the same way as the injection system for atmospheric pressure fuels. One in the liquefied gas tank located fuel pump presses the liquid LPG with a liquid gas specific Operating pressure resulting from the evaporation pressure of the liquefied gas plus the control pressure of the pressure regulator in the fuel return, to the LPG injection valves, the controlled by the LPG control unit become. Excess liquid gas will over a return line to the liquefied gas tank conveyed back. One in the liquefied petroleum gas cycle installed pressure regulator adjusts the system pressure. The LPG control unit is used those generated by the injection control of the normal pressure fuel Signals as input signals for its own programs with which it controls the LPG injectors.

Ein Nachteil herkömmlicher Systeme ist, dass ihre Einspritzsteuerungen keine exakte stöchiometrische Luft-Kraftstoffmischung berechnen können, solange ihnen die genaue Dichte des genutzten Kraftstoffes nicht zu Verfügung steht.One Disadvantage of conventional Systems is that their injection controls are not exact stoichiometric Air-fuel mixture can calculate as long as you know the exact Density of the fuel used is not available.

Aufgabe einer Kraftstoffeinspritzsteuerung ist es, einer in den Zylinder eingebrachte und durch Sensoren gemessene Luftmasse eine adäquate Kraftstoffmasse zuzumessen.task It is a fuel injection control, one in the cylinder introduced and measured by sensors air mass an adequate fuel mass to meter.

Bestimmende Größe der Kraftstoffmasse ist die Kraftstoffdichte. Die Normaldichte des Ottokraftstoffes Benzin zum Beispiel liegt ziemlich stabil bei 0,75 kg/l. Anders jedoch beim Kraftstoff Flüssiggas, dessen Normaldichte je nach Anteilen der Hauptbestandteile Propan und Butan zwischen 0,51 und 0,58 kg/l schwanken kann.determining Size of the fuel mass is the fuel density. The normal density of petrol Gasoline, for example, is fairly stable at 0.75 kg / l. Different However, when fuel LPG, whose Normal density depending on the proportions of the main components propane and butane between 0.51 and 0.58 kg / l.

Herkömmliche Einspritzsteuerungen für Flüssiggas lösen das Problem indem sie die Dichte eines typischen Propan-Butan-Kraftstoffgemisches als Ausgangswert für die Berechnung der einzuspritzenden Kraftstoffmasse zugrunde legen. Das hat den Nachteil, dass sich bei der Verwendung eines Gemisches mit einem abweichenden Propan-Butan-Verhältnis Abweichungen vom idealen stöchiometrischen Luft-Kraftstoffverhältnis ergeben, mit ungünstigen Auswirkungen auf Abgasemission, Leistung und Verbrauch in den Betriebszuständen in denen die Lambda-Regelung nicht aktiv ist.conventional Injection controls for LPG solve that Problem by increasing the density of a typical propane-butane fuel mixture Initial value for to be based on the calculation of the fuel mass to be injected. This has the disadvantage that when using a mixture with a different propane-butane ratio deviations from the ideal one stoichiometric Air-fuel ratio, with unfavorable Effects on exhaust emissions, performance and consumption in operating conditions in where the lambda control is not active.

Zwar erkennt bei lernenden Einspritzsteuerungssystemen das System andauernde Dichteabweichungen des Kraftstoffs aus der Höhe der fortlaufend notwendigen Korrekturen und justiert den Nullpunkt für ein stöchiometrisches Luft-Kraftstoffverhältnis nach. Der Nachteil dieser Regelung ist, dass es eine nachlaufende und träge Regelung ist, die Dichteänderungen durch Wärmeeintrag in den Kraftstoff nicht von einer Dichteänderung durch ein anderes Propan-Butan-Verhältnis unterscheiden kann und aus diesem Grunde immer wieder nachregeln muss.Though The system recognizes persistent learning in injection control systems Density of the fuel from the height of the continuously necessary Corrections and adjusts the zero point for a stoichiometric air-fuel ratio. The disadvantage of this scheme is that it has a trailing and sluggish regulation is, the density changes by heat input in the fuel does not differ from a density change by another propane-butane ratio can and must therefore always readjust.

In der DE 10 2004 044 178 A1 wird deshalb ein Verfahren zur Messung des Propan-Butan-Verhältnisses von Flüssiggaskraftstoffen beschrieben. Es nutzt spezifische Startcharakteristiken der verschiedenen Gemische in Verbindung mit abgeleiteten Werten für die Kraftstofftemperatur und den Kraftstoffdruck. Dieses Verfahren hat den Nachteil, dass es anfällig für Störgrößen ist, die den abgeleiteten Wert ungenau machen.In the DE 10 2004 044 178 A1 is why a method for measuring the propane-butane ratio of liquefied petroleum gas is described. It uses specific starting characteristics of the various mixtures in conjunction with derived values of fuel temperature and fuel pressure. This method has the disadvantage that it is susceptible to disturbances that make the derived value inaccurate.

Aufgabenstellungtask

Diese Nachteile werden durch das erfindungsgemäße Verfahren beseitigt, indem die wirksame Kraftstoffdichte exakt und störgrößenresistent ermittelt wird.These Disadvantages are eliminated by the method according to the invention by the effective fuel density is determined exactly and interference-resistant.

Ein Ausführungsbeispiel einer Einspritzung von flüssigem Flüssiggas, hier in den Ansaugkanal eines Otto-Motors ist in der nachfolgenden Zeichnung dargestellt.One embodiment an injection of liquid LPG, Here in the intake port of a gasoline engine is in the following Drawing shown.

1 zeigt schematisch ein Kraftstoffzuführungssystem für eine Einspritzung von flüssigem Flüssiggas 13 in den Ansaugkanal eines Otto-Motors mit einem elektronisch geregelten Druckregelventil 12 im Kraftstoffrücklauf 10, einer Kraftstoffeinspritzsteuerung 16 zur Berechnung der Einspritzzeiten für die Kraftstoffeinspritzventile 8 und einem Normaldruckkraftstofftank 20, der hier als Reservetank des Flüssiggaskraftstoffsystems dient. 1 schematically shows a fuel supply system for injection of liquid LPG 13 in the intake of an Otto engine with an electronically controlled pressure control valve 12 in the fuel return 10 , a fuel injection control 16 for calculating the injection times for the fuel injection valves 8th and a normal pressure fuel tank 20 which serves here as a reserve tank of the LPG fuel system.

Eine Druck-Temperatur-Sonde 18 misst den Druck und die Temperatur des Kraftstoffes im Flüssiggastank 1; denn nur hier befindet sich der Kraftstoff im ungestörten Zustand des Phasenübergangs von flüssig nach gasförmig und umgekehrt und von außen in das System einwirkende Störgrößen wirken sich hier nicht verfälschend aus.A pressure-temperature probe 18 measures the pressure and temperature of the fuel in the liquefied gas tank 1 ; because only here is the fuel in the undisturbed state of the phase transition from liquid to gaseous and vice versa and from outside into the system acting disturbances have no distorting effect here.

Das hat zur Folge, dass Temperatur und Druck des Flüssiggases im Flüssiggastank exakt eine bestimmte Mischung von Propan und Butan abbilden, weil sie sich genau auf der Verdampfungskennlinie dieser Mischung verändern. Die gemessenen Werte werden der Einspritzsteuerung 16 zugeleitet. Im Steuergerät 16 der Einspritzsteuerung sind die Kennfelder der Kraftstoffmischungen von Flüssiggas abgelegt. Durch Abgleich der gemessenen Werte mit den Kennfeldwerten wird nun das zugehörige Propan-Butan-Mischungsverhältnis ermittelt und dessen Normaldichte errechnet.As a result, the temperature and pressure of the liquefied gas in the liquefied gas tank accurately represent a certain mixture of propane and butane because they change exactly on the evaporation characteristic of this mixture. The measured values become the injection control 16 fed. In the control unit 16 the injection control, the maps of the fuel mixtures of LPG are stored. By comparing the measured values with the map values, the associated propane-butane mixing ratio is determined and its normal density is calculated.

Damit ist es wiederum möglich über eine weitere Druck oder Temperaturmessung durch einen Sensor 17 in der Nähe der Einspritzventile 8 oder im Falle einer Hochdruckdirekteinspritzung nahe der Niederdruckkammer der Hochdruckeinspritzpumpe einen Dichtekorrekturfaktor, bezogen auf die Normbedingungen zu berechnen, der die reale Dichte des Gemisches am Messpunkt ergibt. Mit der realen Dichte berechnet die Einspritzsteuerung 16 anschließend die äquivalente Kraftstoffmasse für eine stöchiometrische Einspritzung.This makes it possible in turn via a further pressure or temperature measurement by a sensor 17 near the injectors 8th or, in the case of direct high pressure injection near the low pressure chamber of the high pressure injection pump, calculate a density correction factor based on the standard conditions which gives the real density of the mixture at the measurement point. With the real density, the injection control calculates 16 then the equivalent fuel mass for a stoichiometric injection.

Claims (1)

Verfahren zur Ermittlung des stöchiometrischen Verbrennungsluft-Kraftstoffverhältnisses von Flüssiggas in flüssigem Aggregatzustand (LPI = Liquid-Propan-Injection) und der notwendigen Einspritzdauer und Einspritzzeitpunktes zur Einspitzung in einen Otto-Motor mit folgenden Schritten: Vor dem Start der Verbrennungskraftmaschine messen Sensoren (18) den Druck und die Temperatur des im Flüssiggastank bevorrateten Flüssiggases (13); Vergleich der gemessenen Werte mit den Werten eines im Steuergerät (16) abgelegten Verdampfungsdruckkennfeldes von Propan und Butan und ihren Gemischen; Spezifizieren der Propan-Butan-Mischung und Ermittlung deren Dichte; Überprüfen und gegebenenfalls Nachjustieren des Wertes der Kraftstoffdichte durch Wiederholen des Prozesses zur Ermittlung der Propan-Butan-Mischungsdichte in festgelegten zeitlichen Abständen. Berechnung des Kraftstoffeinspritzzeitpunktes und der Kraftstoffeinspritzdauer unter Verwendung der ermittelten Flüssiggasdichte und des, von dem Drucksensor (17) gemessenen Kraftstoffdruckes vor den Einspritzventilen (8).Method for determining the stoichiometric combustion air / fuel ratio of liquid gas in the liquid state (LPI = Liquid Propane Injection) and the required injection duration and injection time for injecting into a gasoline engine with the following steps: Before the start of the internal combustion engine, sensors ( 18 ) the pressure and the temperature of the liquefied gas stored in the liquefied gas tank ( 13 ); Comparison of the measured values with the values of one in the control unit ( 16 ) stored evaporation pressure map of propane and butane and their mixtures; Specifying the propane-butane mixture and determining its density; Check and optionally readjust the value of the fuel density by repeating the process of determining the propane-butane mixture density at fixed time intervals. Calculation of the fuel injection time and the fuel injection duration using the determined liquid gas density and, from the pressure sensor ( 17 ) measured fuel pressure upstream of the injectors ( 8th ).
DE102006057177A 2006-12-03 2006-12-03 Stochiometric combustion air fuel ratio and fuel injection period determining method for internal combustion engine i.e. Otto engine, involves calculating fuel injection period by using liquid gas-density and fuel pressure from valve Withdrawn DE102006057177A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008053873A1 (en) * 2008-10-30 2010-05-06 Winkelmann, Karlheinrich, Dipl.-Ing. (TH) Internal combustion engine i.e. petrol engine, operating method for motor vehicle, involves adjusting evaporation pressure of fluid phase with turned-off engine at operating temperature in evaporation-critical position for starting engine
DE102008024561B4 (en) * 2008-05-21 2015-01-08 Vialle Alternative Fuel Systems B.V. Method for operating an internal combustion engine
DE102016206291B3 (en) * 2016-04-14 2017-08-24 Continental Automotive Gmbh Method for starting a natural gas-powered internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024561B4 (en) * 2008-05-21 2015-01-08 Vialle Alternative Fuel Systems B.V. Method for operating an internal combustion engine
DE102008053873A1 (en) * 2008-10-30 2010-05-06 Winkelmann, Karlheinrich, Dipl.-Ing. (TH) Internal combustion engine i.e. petrol engine, operating method for motor vehicle, involves adjusting evaporation pressure of fluid phase with turned-off engine at operating temperature in evaporation-critical position for starting engine
DE102016206291B3 (en) * 2016-04-14 2017-08-24 Continental Automotive Gmbh Method for starting a natural gas-powered internal combustion engine

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