EP0699832A2 - Procédé et dispositif d'admission de vapeur de carburant dans un conduit d'aspiration d'un moteur d'un véhicule - Google Patents

Procédé et dispositif d'admission de vapeur de carburant dans un conduit d'aspiration d'un moteur d'un véhicule Download PDF

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Publication number
EP0699832A2
EP0699832A2 EP95110182A EP95110182A EP0699832A2 EP 0699832 A2 EP0699832 A2 EP 0699832A2 EP 95110182 A EP95110182 A EP 95110182A EP 95110182 A EP95110182 A EP 95110182A EP 0699832 A2 EP0699832 A2 EP 0699832A2
Authority
EP
European Patent Office
Prior art keywords
throttle valve
intake manifold
valve
fuel vapor
air flow
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP95110182A
Other languages
German (de)
English (en)
Other versions
EP0699832B1 (fr
EP0699832A3 (fr
Inventor
Martin Koelter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0699832A2 publication Critical patent/EP0699832A2/fr
Publication of EP0699832A3 publication Critical patent/EP0699832A3/fr
Application granted granted Critical
Publication of EP0699832B1 publication Critical patent/EP0699832B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir

Definitions

  • the invention relates to a method for supplying fuel vapor into an intake manifold of an internal combustion engine according to the preamble of claim 1 and to a device for carrying out this method according to the preamble of claim 2.
  • a device for supplying fuel vapor into an intake manifold of an internal combustion engine in motor vehicles is known, for example, from DE-OS 26 12 300.
  • a suction pipe containing a throttle valve for supplying an air flow is connected to the internal combustion engine of a motor vehicle.
  • the known device has a controllable valve with an input, which with a fuel vapor-absorbing buffer, for. B. an activated carbon filter.
  • the controllable valve has an outlet to an intake manifold section in the air flow direction behind the throttle valve.
  • fuel vapor is conducted from the intermediate store to the intake manifold, the amount of fuel vapor passed through the valve being controlled by a vacuum chamber attached to the valve and connected to the intake manifold in the air flow direction in front of the throttle valve.
  • a vacuum chamber attached to the valve and connected to the intake manifold in the air flow direction in front of the throttle valve.
  • the supply of fuel vapor at this point has an effect in some operating states of the internal combustion engine, which generate a strong negative pressure, in particular in the air flow direction behind the throttle valve, for. B. at idle, on the regulation of the fuel-air ratio due to difficult metering of the amount of fuel vapor particularly negative.
  • the result is an increase in exhaust emissions and driving errors such as snapping and jerking.
  • a method for supplying fuel vapor to an internal combustion engine by means of a controllable valve in which the passage opening cross-section of the valve can be continuously changed by electrical clocking depending on the current operating state of the internal combustion engine in order to improve the meterability of the fuel vapor amount.
  • This known method involves a high computing effort in the control device performing the method and a large amount of work in advance in order to create characteristic diagrams.
  • the device for carrying out this known method provides for the supply of fuel vapor in the intake manifold of the internal combustion engine in the air flow direction in front of the throttle valve.
  • this device solves the problem of poor meterability of the fuel vapor quantity in operating states which generate a strong negative pressure behind the throttle valve, it in turn has further problems in other operating states. For example, when the internal combustion engine is operating at full load, large quantities of air are requested, which can only be provided with a small vacuum, in particular in the air flow direction in front of the throttle valve, by means of large hose and valve diameters for the supply of the fuel vapor.
  • a method for supplying fuel vapor to an intake pipe of an internal combustion engine in motor vehicles containing a throttle valve and carrying an air flow is improved by means of a controllable valve such that the fuel vapor is either upstream or downstream depending on the current operating state of the internal combustion engine is supplied to the throttle valve.
  • a controllable valve such that the fuel vapor is either upstream or downstream depending on the current operating state of the internal combustion engine is supplied to the throttle valve.
  • the fuel vapor is fed in the air flow direction behind the throttle valve.
  • the current operating state of the internal combustion engine can, for example, by the measurement of the negative pressure itself or by signals that at least indirectly indicate the prevailing negative pressure can be determined.
  • the signal that represents the position of the accelerator pedal or the throttle valve can be used to distinguish between idle operation and full-load operation.
  • This method according to the invention ensures good meterability of the fuel vapor quantity and thus good exhaust gas emission control regardless of the operating state of the internal combustion engine. In addition, the occurrence of problems elsewhere, such as B. the increase in the amount of leakage air prevented. Furthermore, the saturation of the activated carbon filter usually used as a fuel vapor buffer is avoided.
  • the controllable valve in a particularly advantageous device for carrying out the method according to the invention with an intake manifold of an internal combustion engine containing a throttle valve and a controllable valve with at least one inlet for supplying fuel vapor, has a first outlet to a first intake manifold section in the air flow direction the throttle valve and a second outlet to a second intake manifold section in the air flow direction behind the throttle valve.
  • This device according to the invention enables the fuel vapor to be optionally supplied in front of or behind the throttle valve in a particularly simple manner.
  • FIG. 1 shows an intake pipe guiding an air flow (arrow), which contains a throttle valve 3 which substantially influences the amount of air flow in the intake pipe.
  • the intake manifold consists of a first intake manifold section 1 in the air flow direction in front of the throttle valve 3 and a second intake manifold section 2 in the air flow direction behind the throttle valve 3.
  • the intake manifold is connected to an internal combustion engine 4 at the end of the second intake manifold section 2.
  • a bypass 9 between the first intake manifold section 1 and the second intake manifold section 2 passes into the outlet of a controllable valve 7.
  • the controllable valve 7 is connected to an activated carbon filter 5 via an input line 8.
  • the activated carbon filter 5 has a fresh air inlet 6.
  • the fuel vapor stored in the activated carbon filter 5 becomes volatile again in connection with the fresh air supplied through the fresh air inlet 6 and can be fed to the intake manifold sections 1 and 2 via the inlet line 8 with the valve 7 open via the outlet line and the bypass 9. The fuel vapor is then passed on to the internal combustion engine 4 via the intake manifold section 2.
  • a first outlet 10 of the controllable valve 7 is connected to the intake manifold section 1 and a second outlet 11 of the valve 7 is connected to the intake manifold section 2.
  • the input line 8 is optionally connected to the first output 10 or the second output 11.
  • the controllable valve 7 can be actuated, for example, electromagnetically or by negative pressure arising in the intake manifold. For example, there is negative pressure in the intake manifold section 2 or is triggered by an electrical signal, e.g. B. indicated by the throttle valve position sensor, idle mode, the valve 7 ensures a connection of the input line 8 to the first output 10. However, if the intake manifold is almost free of negative pressure or is recognized by an electrical signal at full load, the valve 7 connects the input line 8 to the second output 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP95110182A 1994-08-31 1995-06-29 Procédé et dispositif d'admission de vapeur de carburant dans un conduit d'aspiration d'un moteur d'un véhicule Expired - Lifetime EP0699832B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4430971 1994-08-31
DE4430971A DE4430971A1 (de) 1994-08-31 1994-08-31 Verfahren und Vorrichtung zur Zufuhr von Kraftstoffdampf in ein Saugrohr einer Brennkraftmaschine in Kraftfahrzeugen

Publications (3)

Publication Number Publication Date
EP0699832A2 true EP0699832A2 (fr) 1996-03-06
EP0699832A3 EP0699832A3 (fr) 1996-05-22
EP0699832B1 EP0699832B1 (fr) 1999-12-29

Family

ID=6527057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110182A Expired - Lifetime EP0699832B1 (fr) 1994-08-31 1995-06-29 Procédé et dispositif d'admission de vapeur de carburant dans un conduit d'aspiration d'un moteur d'un véhicule

Country Status (3)

Country Link
EP (1) EP0699832B1 (fr)
DE (2) DE4430971A1 (fr)
ES (1) ES2141283T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771779A1 (fr) * 1997-11-28 1999-06-04 Renault Dispositif pour traiter les vapeurs de combustible d'un vehicule automobile
EP2434136A3 (fr) * 2010-09-22 2014-09-17 Keihin Corporation Appareil de contrôle de carburant évaporé pour moteur à combustion interne

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612300A1 (de) 1975-03-25 1976-10-07 Nissan Motor Vorrichtung zur brennstofftank-belueftung und steuerung des luft-brennstoff- verhaeltnisses einer brennkraftmaschine
DE3502573A1 (de) 1985-01-26 1986-07-31 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur entlueftung von kraftstofftanks

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8909976U1 (fr) * 1989-08-19 1989-10-26 Pierburg Gmbh, 4040 Neuss, De
DE59004362D1 (de) * 1990-10-24 1994-03-03 Siemens Ag Kraftstoffeinspritzsystem für eine Brennkraftmaschine.
US5190015A (en) * 1991-02-05 1993-03-02 Toyota Jidosha Kabushiki Kaisha Evaporated fuel discharge suppressing apparatus for an internal combustion engine
JPH04311664A (ja) * 1991-04-11 1992-11-04 Toyota Motor Corp 蒸発燃料回収装置
US5183023A (en) * 1991-11-01 1993-02-02 Siemens Automotive Limited Evaporative emission control system for supercharged internal combustion engine
JP2970280B2 (ja) * 1993-02-05 1999-11-02 トヨタ自動車株式会社 発電機駆動用エンジンの制御装置
DE4303309A1 (de) * 1993-02-05 1994-08-11 Bosch Gmbh Robert Tankentlüftungsanlage für eine Brennkraftmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612300A1 (de) 1975-03-25 1976-10-07 Nissan Motor Vorrichtung zur brennstofftank-belueftung und steuerung des luft-brennstoff- verhaeltnisses einer brennkraftmaschine
DE3502573A1 (de) 1985-01-26 1986-07-31 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur entlueftung von kraftstofftanks

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771779A1 (fr) * 1997-11-28 1999-06-04 Renault Dispositif pour traiter les vapeurs de combustible d'un vehicule automobile
EP2434136A3 (fr) * 2010-09-22 2014-09-17 Keihin Corporation Appareil de contrôle de carburant évaporé pour moteur à combustion interne

Also Published As

Publication number Publication date
DE59507512D1 (de) 2000-02-03
EP0699832B1 (fr) 1999-12-29
DE4430971A1 (de) 1996-03-07
ES2141283T3 (es) 2000-03-16
EP0699832A3 (fr) 1996-05-22

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