GB2297395A - IC engine idle speed control - Google Patents

IC engine idle speed control Download PDF

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Publication number
GB2297395A
GB2297395A GB9501330A GB9501330A GB2297395A GB 2297395 A GB2297395 A GB 2297395A GB 9501330 A GB9501330 A GB 9501330A GB 9501330 A GB9501330 A GB 9501330A GB 2297395 A GB2297395 A GB 2297395A
Authority
GB
United Kingdom
Prior art keywords
engine
idle speed
solenoid valve
air supply
valve
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.)
Withdrawn
Application number
GB9501330A
Other versions
GB9501330D0 (en
Inventor
Richard J Rinke
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.)
Ford Motor Co
Original Assignee
Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Priority to GB9501330A priority Critical patent/GB2297395A/en
Publication of GB9501330D0 publication Critical patent/GB9501330D0/en
Publication of GB2297395A publication Critical patent/GB2297395A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/10—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air having secondary air added to the fuel-air mixture
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/1055—Details of the valve housing having a fluid by-pass
    • 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
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
    • 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
    • F02M25/06—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding lubricant vapours
    • 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
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/009—EGR combined with means to change air/fuel ratio, ignition timing, charge swirl in the cylinder
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10373—Sensors for intake systems
    • F02M35/10386—Sensors for intake systems for flow rate
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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

Landscapes

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

Description

INTERNAL COMBUSTION ENGINE WITH ELECTRONIC IDLE SPEED CONTROL Field of the invention The present invention relates to an internal combustion engine having electronic idle speed control.
Field of the invention To set the idle speed of an engine, it is known to provide a small bypass pipe connected in parallel with the main butterfly throttle and to place an electronically controlled solenoid valve within the bypass pipe. During starting, the driver in modern vehicles is called upon not to operate the accelerator pedal and the amount of air supplied to the engine is determined by the engine management system. If therefore a failure develops in the solenoid valve that regulates the idle speed, then the engine will not start.
Obiect of the invention The present invention therefore seeks to provide an engine that can be started and that will idle even in the event of failure of the idle speed solenoid valve.
Summary of the invention According to the present invention, there is provided an internal combustion engine having a main throttle valve, an idle speed solenoid valve arranged in a bypass pipe connected across the main throttle, an engine management system for controlling the solenoid valve to regulate the idle speed and an auxiliary air supply connected downstream of the main throttle and having a further electrically controlled valve connected to the engine management system that is normally closed during engine startup, characterised in that the engine management system has means for monitoring the control of the engine idle speed to determine failure of the idle speed solenoid valve, means for storing a signal indicative of the failure of the idle speed solenoid valve, and means for opening the normally closed valve in the auxiliary air supply during engine startup in the presence of a stored signal indicative of failure of the idle speed solenoid valve.
Auxiliary air supplies that bypass the throttle have previously been proposed for a variety of purposes. One such proposal is to be found in systems that avoid hydrocarbon emissions into the atmosphere from the vent pipe of the vehicle fuel tank. Fuel tanks must be vented as air must be allowed to replace the fuel supplied to the engine.
However, if no steps are taken, fuel will also evaporate into the atmosphere through the vent pipe. For this reason, it has been proposed to place in the vent pipe a canister containing a material, such as active charcoal, that absorbs fuel vapours. Periodically, the canister must be purged without the fuel vapours escaping to atmosphere and this is done. by allowing small amounts of ambient air to flow through the canister to the engine intake system, at times when the engine is operating in a steady state. The vapours are then burnt in the engine combustion chambers or oxidised in the catalytic converter.
Normally, when the engine is being started, the line used for purging the vapour canister in the tank vent pipe is closed by a solenoid valve. In the present invention, use may be made of this solenoid valve to provide an alternative idle air supply to the engine when the idle speed solenoid valve is known not to be functioning correctly, thereby allowing a degree of fault tolerance to be achieved without adding to the cost or the complexity of the engine.
It has also be suggested to use air assisted fuel injectors to achieve better charge preparation. Such.injectors rely on the use of a gas to atomise and vaporise the fuel and normally steps are taken to ensure that this additional gas does not interfere with the idling of the engine. To this end, it has been suggested to use gas that has already passed through the metering system or EGR gases containing little oxygen. The simplest solution however is to use ambient air but if ambient air is used then the supply must be limited to avoid disturbing the idling speed.In this invention, it would be possible to operate a solenoid valve and allow more air to be admitted through the air assisted injectors in the event of failure of the idle speed solenoid valve, the additional air achieving better fuel preparation as well as ensuring that there is sufficient air for the engine to idle smoothly.
Brief description of the drawings The invention will now be described further, by way of example, with reference to the accompanying drawing, which is a schematic representation of an air intake system embodying the invention.
Description of the preferred embodiment The single figure diagrammatically shows an intake pipe 12 leading to a port of an internal combustion engine and having a mass airflow meter 10 and a main throttle valve 14, in the form of a butterfly. A bypass pipe 16 connected across the main throttle valve 14 includes an idle speed solenoid valve 18 that is controlled by the electronic engine management system to regulate the engine idle speed when the main throttle valve 14 is in its closed position.
The solenoid valve 18 is controlled using a closed control loop with negative feedback of an engine speed dependent signal to maintain a constant idle speed.
An intake system as so far described is conventional and suffers from the problem that the engine will not start and idle regularly if the valve 18 should fail to open.
The drawing shows two auxiliary air supplies that may be used to provide the required idling air in the event of failure of the solenoid valve 18. The first such air supply comprises a line 22 that leads to a vapour collecting canister 20 in the vent pipe of the fuel tank and which can be opened and closed by a solenoid 26. The purpose of the line 22 is to purge the canister of stored fuel vapours by drawing clean air through it to evaporate stored fuel. The air laden with fuel vapours is supplied to the engine when it is operating in a steady state to allow the vapours to be burnt off. Normally, the solenoid valve 26 would be closed during engine startup but in the present invention, in the event of failure of the solenoid valve 18 this valve is left open during startup to provide enough air for the engine to start and idle.
Failure of the valve 18 can be sensed when the closed feedback control loop fails to maintain the engine speed steady. If the engine management system detects difficulty in maintaining a steady idle speed then a signal is stored in a memory to indicate failure of the solenoid valve 18 and this signal is used to open the valve 26 during subsequent engine startups. At the same time, the signal can be used to display to the driver a warning that the engine management system is in need of attention.
The single figure also shows an air assisted fuel injector 30 connected to the intake manifold adjacent the intake port. It will of course the appreciated that the intake pipe 12 has several manifold branches each leading to a different engine cylinder intake port and containing an injector 30 but for simplicity only one such injector is represented in the drawing.
Conventionally, the gas supply pipe to the air assisted injector may draw gas from a variety of different sources, for example EGR gas or gas stored in a reservoir pressurised by gas drawn from the engine cylinders through non-return valves. Normally, the intention is to ensure that the gas used to assist in charge preparation does not interfere with the idling of the engine. In the described embodiment of the present invention, however, the air assisted injectors are additionally connected through a normally closed solenoid valve 28 and a pipe 24 to atmosphere. This connection to ambient air is used in addition to any other gas supply as described above and represented in the drawing by the pipe 32. Thus, when the valve 28 is closed, the air assisted injectors will operate normally using the gas drawn through the pipe 32 but in the event of failure of the solenoid valve 18, then the valve 24 will be opened to supplement the gas used for charge preparation and supply the extra air required for the engine to start and idle regularly.

Claims (4)

CLAIM S
1. An internal combustion engine having a main throttle valve, an idle speed solenoid valve arranged in a bypass pipe connected across the main throttle, an engine management system for controlling the solenoid valve to regulate the idle speed and an auxiliary air supply connected downstream of the main throttle and having a further electrically controlled valve connected to the engine management system that is normally closed during engine startup, characterised in that the engine management system has means for monitoring the control of the engine idle speed to determine failure of the idle speed solenoid valve, means for storing a signal indicative of the failure of the idle speed solenoid valve, and means for opening the normally closed valve in the auxiliary air supply during engine startup in the presence of a stored signal indicative of failure of the idle speed solenoid valve.
2. An internal combustion engine as claimed in claim 1, wherein the auxiliary air supply is an air supply serving to purge vapours in a storage canister connected to the vent pipe of a fuel tank.
3. An internal combustion engine as claimed in claim 1, wherein the auxiliary air supply is an air supply for air assisted fuel injectors of the engine.
4. An internal combustion engine constructed, arranged and adapted to operate substantially as herein described with reference to and as illustrated in the accompanying drawing.
GB9501330A 1995-01-24 1995-01-24 IC engine idle speed control Withdrawn GB2297395A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9501330A GB2297395A (en) 1995-01-24 1995-01-24 IC engine idle speed control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9501330A GB2297395A (en) 1995-01-24 1995-01-24 IC engine idle speed control

Publications (2)

Publication Number Publication Date
GB9501330D0 GB9501330D0 (en) 1995-03-15
GB2297395A true GB2297395A (en) 1996-07-31

Family

ID=10768460

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9501330A Withdrawn GB2297395A (en) 1995-01-24 1995-01-24 IC engine idle speed control

Country Status (1)

Country Link
GB (1) GB2297395A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280471A (en) * 1979-01-22 1981-07-28 Nissan Motor Company, Limited Control system for internal combustion engine
GB2186714A (en) * 1986-02-13 1987-08-19 Honda Motor Co Ltd Air supply control arrangement for an internal-combustion engine
US4794790A (en) * 1986-07-19 1989-01-03 Robert Bosch Gmbh Diagnostic method and arrangement for quantitatively checking actuators in internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280471A (en) * 1979-01-22 1981-07-28 Nissan Motor Company, Limited Control system for internal combustion engine
GB2186714A (en) * 1986-02-13 1987-08-19 Honda Motor Co Ltd Air supply control arrangement for an internal-combustion engine
US4794790A (en) * 1986-07-19 1989-01-03 Robert Bosch Gmbh Diagnostic method and arrangement for quantitatively checking actuators in internal combustion engines

Also Published As

Publication number Publication date
GB9501330D0 (en) 1995-03-15

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)