WO2015110399A1 - An apparatus for purging fuel vapours from a fuel tank - Google Patents

An apparatus for purging fuel vapours from a fuel tank Download PDF

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Publication number
WO2015110399A1
WO2015110399A1 PCT/EP2015/050931 EP2015050931W WO2015110399A1 WO 2015110399 A1 WO2015110399 A1 WO 2015110399A1 EP 2015050931 W EP2015050931 W EP 2015050931W WO 2015110399 A1 WO2015110399 A1 WO 2015110399A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
purging
intake manifold
ecu
purge valve
Prior art date
Application number
PCT/EP2015/050931
Other languages
French (fr)
Inventor
Ramachandra PRADEEP
Vikram KARUPPAIAH
Anantha PRASHANTH
Harish Kamath
Akshata PUROHIT
Dileep PRABHU
Pramod REDDEMREDDY
Suresh DORAI NADAR
Original Assignee
Robert Bosch Gmbh
Robert Bosch Engineering and Business Solutions Ltd.
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 Robert Bosch Gmbh, Robert Bosch Engineering and Business Solutions Ltd. filed Critical Robert Bosch Gmbh
Publication of WO2015110399A1 publication Critical patent/WO2015110399A1/en

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Classifications

    • 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
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
    • F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position

Definitions

  • the present invention relates to purging of fuel vapours from a fuel tank. Particularly the invention relates to purging of fuel vapours from a fuel tank for engines having carburettor based fuel supply systems.
  • JP-2012026332 discloses one such evaporative fuel purging system for a vehicle with electronic fuel injection system.
  • spark ignition engine needs to be assisted with additional air and rich fuel mixture manually during cold start conditions.
  • This device is currently known as a choke. In such a device there is a possibility of continuous running of engine with rich fuel even at warm engine running condition, if user fails to deactivate the mechanism. This will result in unnecessary fuel consumption, adding up to running cost.
  • the present invention envisages a device for purging fuel vapours from a fuel tank of a vehicle with carburettor by means of an electronically controlled solenoid purge valve.
  • An electronic control actuates the solenoid purge valve based on certain predefined engine operation parameters received by the control unit.
  • the engine operation parameters are selected from a group comprising engine speed signal (Pa), crank signal (Pb), ignition pulse (Pc), intake manifold pressure signal (Pd), throttle position signal (Pe) and engine temperature (Pf).
  • the device is adapted to be retrofitted to a vehicle with carburetor for purging fuel vapors from fuel tank to the intake manifold.
  • a plurality of flow paths are established for purging fuel vapours between a carbon canister which traps the fuel vapors from the fuel tank and the intake manifold.
  • the solenoid purge valve with a coupled control unit is positioned between the carbon canister and the intake manifold for controlled release of fuel vapours from the canister.
  • Fig. 1 illustrates an electronically controlled solenoid purge valve to purge fuel vapours in accordance with one embodiment of the invention
  • Fig. 2 illustrates an apparatus for purging the fuel vapours from the fuel tank to the intake manifold in accordance with one embodiment of the invention.
  • Fig. 1 illustrates a device for purging fuel vapours from a tank in accordance with one embodiment of the invention.
  • the device (10) for purging fuel vapours from a fuel tank of a vehicle with carburettor comprises a solenoid valve (12) and an electronic control unit (ECU) (14) coupled with the solenoid valve (12).
  • the ECU (14) is adapted to operate the solenoid valve (12) based on predefined engine operation parameters received by the ECU (14).
  • the engine operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe).
  • the device (10) is adapted to be retrofitted to a vehicle with carburetor for purging fuel vapors from fuel tank to the intake manifold.
  • Fig. 2 illustrates an apparatus (20) for purging the fuel vapours from the fuel tank (21) to the intake manifold (25) in accordance with one embodiment of the invention.
  • the apparatus (20) for purging fuel vapours from a fuel tank (21) for a vehicle with carburettor comprises a first flow path (22) for purging fuel vapors from the tank (21) to a carbon canister (23).
  • a second flow path (24) supplies air from an intake manifold (25) to the carbon canister (23).
  • the air supplied to the carbon canister (23) from the second flow path (24) purges the fuel vapours that are absorbed by the carbon canister (23).
  • a third flow path (26) purges the fuel vapors from carbon canister (23) to the intake manifold (25) of the vehicle.
  • An electronic control unit (ECU) (14) is adapted to receive certain predefined engine operation parameters and operate a solenoid purge valve (12) coupled with it.
  • the solenoid purge valve (12) is positioned in the third flow path (26) to achieve controlled purging of fuel vapours from the canister (23) into the intake manifold (25) based on said predefined engine operation parameters.
  • the engine operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe).
  • the ECU (14) is adapted to control the duty cycle of the solenoid purge valve (12) based on at least one of the signals received by the ECU to control purging of fuel vapours from the carbon canister (23) to the intake manifold (25).
  • the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) based on manifold pressure (Pc), or ignition pulse (Pb) or throttle position (Pd) during engine operation cycle.
  • the ECU (14) activates and deactivates solenoid valve based on any signals like ignition pulse, manifold pressure signal or throttle position.
  • the ECU (14) uses these engine operation parameters for defining the purging zones based on engine load.
  • the ECU (14) is coupled with the solenoid valve (12) or mounted on to the solenoid valve to form a single component facilitating plug and use with existing carburettor system in two wheelers.
  • the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during cold start by a time based operation or based on engine temperature.
  • the ECU (14) controlled solenoid purge valve (12) is used for purging the carbon canister (23) during cold start conditions.
  • the fuel vapours and air mixture purged from the canister (23) aids in the starting of the engine in cold conditions and hence the operation of a manual choke is not necessary.
  • the activation and deactivation of solenoid purge valve (12) is controlled by the ECU (14) based on the engine speed calculated from ignition pulse or from manifold pressure signal or by crank speed sensor or any other means.
  • the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during idling assist based on engine temperature.
  • the ECU (14) controls the solenoid purge valve (12) in a pulse width modulated mode of operation to assist the engine for idling by supplying fuel vapours at cold temperature or any other condition which might result in undesired engine stalling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The present invention discloses a device (20) for purging fuel vapours from a fuel tank (21) of a vehicle with carburetor, by means of an electronically controlled solenoid purge valve (12). An electronic control unit (14) actuates the solenoid purge valve (12) based on certain predefined engine operation parameters received by the electronic control unit (14). The device (20) is adapted to be retrofitted to a vehicle with carburretor for purging fuel vapors from fuel tank (21) to the intake manifold (25).

Description

COMPLETE SPECIFICATION
TITLE
AN APPARATUS FOR PURGING FUEL VAPOURS FROM A FUEL TANK
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed:
Field of the invention:
The present invention relates to purging of fuel vapours from a fuel tank. Particularly the invention relates to purging of fuel vapours from a fuel tank for engines having carburettor based fuel supply systems.
Background of the invention:
For gasoline vehicles, due to increase in ambient temperature the fuel in the tank may get evaporated. In systems with electronic fuel injection systems, there may be a purge valve to purge the fuel vapours from the tank into the intake manifold. However in present carburettor based fuel supply systems evaporated fuel from fuel tank is released into atmosphere through breather since there is no means for electronically controlled purging. Hence meeting the evaporative emission legislations with present fuel tank architecture is difficult for carburettor based vehicles.
JP-2012026332 discloses one such evaporative fuel purging system for a vehicle with electronic fuel injection system.
Further in the present vehicle, spark ignition engine needs to be assisted with additional air and rich fuel mixture manually during cold start conditions. This device is currently known as a choke. In such a device there is a possibility of continuous running of engine with rich fuel even at warm engine running condition, if user fails to deactivate the mechanism. This will result in unnecessary fuel consumption, adding up to running cost.
Hence there is a need for a solution for meeting the evaporative emission norms for carburettor based vehicles and also have an intelligent choke solution for the vehicle during cold start conditions.
Brief description of the invention:
Meeting the evaporative fuel emission norms is difficult for vehicles having a carburettor based fuel supply systems. Such vehicles typically do not have any electronic control for the fuel supply systems and hence controlled purging of the fuel vapours is a challenge. There is a need for a device which can be used along with carburettor based fuel supply systems.
The present invention envisages a device for purging fuel vapours from a fuel tank of a vehicle with carburettor by means of an electronically controlled solenoid purge valve. An electronic control actuates the solenoid purge valve based on certain predefined engine operation parameters received by the control unit. The engine operation parameters are selected from a group comprising engine speed signal (Pa), crank signal (Pb), ignition pulse (Pc), intake manifold pressure signal (Pd), throttle position signal (Pe) and engine temperature (Pf). The device is adapted to be retrofitted to a vehicle with carburetor for purging fuel vapors from fuel tank to the intake manifold. A plurality of flow paths are established for purging fuel vapours between a carbon canister which traps the fuel vapors from the fuel tank and the intake manifold. The solenoid purge valve with a coupled control unit is positioned between the carbon canister and the intake manifold for controlled release of fuel vapours from the canister.
Brief description of the drawings:
The present invention is described with reference to the following accompanying drawings:
Fig. 1 illustrates an electronically controlled solenoid purge valve to purge fuel vapours in accordance with one embodiment of the invention; and Fig. 2 illustrates an apparatus for purging the fuel vapours from the fuel tank to the intake manifold in accordance with one embodiment of the invention.
Detailed description of the embodiments:
Fig. 1 illustrates a device for purging fuel vapours from a tank in accordance with one embodiment of the invention.
The device (10) for purging fuel vapours from a fuel tank of a vehicle with carburettor comprises a solenoid valve (12) and an electronic control unit (ECU) (14) coupled with the solenoid valve (12). The ECU (14) is adapted to operate the solenoid valve (12) based on predefined engine operation parameters received by the ECU (14). The engine operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe). The device (10) is adapted to be retrofitted to a vehicle with carburetor for purging fuel vapors from fuel tank to the intake manifold.
Fig. 2 illustrates an apparatus (20) for purging the fuel vapours from the fuel tank (21) to the intake manifold (25) in accordance with one embodiment of the invention.
The apparatus (20) for purging fuel vapours from a fuel tank (21) for a vehicle with carburettor comprises a first flow path (22) for purging fuel vapors from the tank (21) to a carbon canister (23). A second flow path (24) supplies air from an intake manifold (25) to the carbon canister (23). The air supplied to the carbon canister (23) from the second flow path (24) purges the fuel vapours that are absorbed by the carbon canister (23). A third flow path (26) purges the fuel vapors from carbon canister (23) to the intake manifold (25) of the vehicle. An electronic control unit (ECU) (14) is adapted to receive certain predefined engine operation parameters and operate a solenoid purge valve (12) coupled with it. The solenoid purge valve (12) is positioned in the third flow path (26) to achieve controlled purging of fuel vapours from the canister (23) into the intake manifold (25) based on said predefined engine operation parameters. The engine operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe). The ECU (14) is adapted to control the duty cycle of the solenoid purge valve (12) based on at least one of the signals received by the ECU to control purging of fuel vapours from the carbon canister (23) to the intake manifold (25).
In accordance with one embodiment of the invention, it is envisaged that the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) based on manifold pressure (Pc), or ignition pulse (Pb) or throttle position (Pd) during engine operation cycle. The ECU (14) activates and deactivates solenoid valve based on any signals like ignition pulse, manifold pressure signal or throttle position. The ECU (14) uses these engine operation parameters for defining the purging zones based on engine load. The ECU (14) is coupled with the solenoid valve (12) or mounted on to the solenoid valve to form a single component facilitating plug and use with existing carburettor system in two wheelers.
In accordance with another embodiment of the invention, it is envisaged that the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during cold start by a time based operation or based on engine temperature. In accordance with this embodiment the ECU (14) controlled solenoid purge valve (12) is used for purging the carbon canister (23) during cold start conditions. The fuel vapours and air mixture purged from the canister (23) aids in the starting of the engine in cold conditions and hence the operation of a manual choke is not necessary. The activation and deactivation of solenoid purge valve (12) is controlled by the ECU (14) based on the engine speed calculated from ignition pulse or from manifold pressure signal or by crank speed sensor or any other means.
In accordance with another embodiment of the invention, it is envisaged that the ECU (14) operates the solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during idling assist based on engine temperature. The ECU (14) controls the solenoid purge valve (12) in a pulse width modulated mode of operation to assist the engine for idling by supplying fuel vapours at cold temperature or any other condition which might result in undesired engine stalling. It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. Any other type of electronically controlled valve or electronically controlled actuator may be used for controlled release of the trapped fuel vapours from the carbon canister to the intake manifold. The scope of the invention is only limited by the scope of the claims.

Claims

We claim
1. A device (10) for purging fuel vapours from a fuel tank of a vehicle with
carburettor, said device comprising
a solenoid valve (12); and
an electronic control unit (ECU) (14) coupled with said solenoid valve, said ECU (14) adapted to operate said solenoid valve (12) based on predefined engine operation parameters received by the ECU (14).
2. A device (10) for purging fuel as claimed in claim (1) wherein said engine
operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe).
3. A device (10) as claimed in claim (1) wherein said device (10) is adapted to be retrofitted to a vehicle with carburetor for purging fuel vapors from fuel tank to the intake manifold.
4. An apparatus (20) for purging fuel vapours from a fuel tank (21) for a vehicle with carburettor; said apparatus comprising
a first flow path (22) for purging fuel vapors from the tank (21) to a carbon canister
(23);
a second flow path (24) supplying air from an intake manifold (25) to said carbon canister (23);
a third flow path (26) for purging fuel vapors from carbon canister (23) to the intake manifold (25) of the vehicle;
said apparatus characterized in that,
a solenoid purge valve (12) positioned in said third flow path (26); and
an electronic control unit (ECU) (14) coupled to said solenoid purge valve (12) and adapted to receive certain predefined engine operation parameters and operate said solenoid purge valve (12) to achieve controlled purging of fuel vapours from the canister (23) into the intake manifold (25) based on said predefined engine operation parameters.
5. An apparatus as claimed in claim (4) wherein said engine operation parameters are selected from a group comprising engine speed signal (Pa), ignition pulse (Pb), intake manifold pressure signal (Pc), throttle position signal (Pd) and engine temperature (Pe).
6. An apparatus as claimed in claim (4) and (5) wherein, said ECU (14) is adapted to control the duty cycle of the solenoid purge valve (12) based on at least one of the engine operation parameters to control purging of fuel vapours from the carbon canister (23) to the intake manifold (25).
7. An apparatus as claimed in claim (4) wherein said ECU (14) operates said
solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) based on at least one of manifold pressure signal (Pc), ignition pulse (Pb), and throttle position (Pd) during engine operation cycle.
8. An apparatus as claimed in claim (4) wherein said ECU (14) operates said
solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during cold start by a time based operation during start or based on engine temperature (Pe).
9. An apparatus as claimed in claim (4) wherein said ECU (14) operates said
solenoid purge valve (12) to achieve controlled purging of fuel vapours from the carbon canister (23) into the intake manifold (25) during idling assist based on engine temperature (Pe).
PCT/EP2015/050931 2014-01-21 2015-01-20 An apparatus for purging fuel vapours from a fuel tank WO2015110399A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN267CH2014 2014-01-21
IN267/CHE/2014 2014-01-21

Publications (1)

Publication Number Publication Date
WO2015110399A1 true WO2015110399A1 (en) 2015-07-30

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19822506A1 (en) * 1997-05-22 1998-11-26 Denso Corp Air/fuel control device for IC engine
US20040173190A1 (en) * 2003-03-04 2004-09-09 Aisan Kogyo Kabushiki Kaisha Evaporated fuel treating device
US20090287392A1 (en) * 2008-05-16 2009-11-19 Cummins Inc. Method and system for closed loop lambda control of a gaseous fueled internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008215341A (en) * 2007-02-06 2008-09-18 Aisan Ind Co Ltd Canister and evaporated fuel treatment device
CN101648514A (en) * 2009-09-04 2010-02-17 奇瑞汽车股份有限公司 Fuel supply system of double-fuel automobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19822506A1 (en) * 1997-05-22 1998-11-26 Denso Corp Air/fuel control device for IC engine
US20040173190A1 (en) * 2003-03-04 2004-09-09 Aisan Kogyo Kabushiki Kaisha Evaporated fuel treating device
US20090287392A1 (en) * 2008-05-16 2009-11-19 Cummins Inc. Method and system for closed loop lambda control of a gaseous fueled internal combustion engine

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Publication number Publication date
TW201540941A (en) 2015-11-01
TWI681113B (en) 2020-01-01

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