GB2511608A - Method for operating an internal combustion engine of a vehicle - Google Patents

Method for operating an internal combustion engine of a vehicle Download PDF

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Publication number
GB2511608A
GB2511608A GB1322364.9A GB201322364A GB2511608A GB 2511608 A GB2511608 A GB 2511608A GB 201322364 A GB201322364 A GB 201322364A GB 2511608 A GB2511608 A GB 2511608A
Authority
GB
United Kingdom
Prior art keywords
fuel
engine
vehicle
mode
air
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Withdrawn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
GB1322364.9A
Other versions
GB201322364D0 (en
GB2511608A8 (en
Inventor
S Nareshkumar
Desmond Bubeck
R Lakshmi Narayana
Karthikeyan Venkatesan
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.)
Mercedes Benz Group AG
Original Assignee
Daimler 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 Daimler AG filed Critical Daimler AG
Priority to GB1322364.9A priority Critical patent/GB2511608A/en
Publication of GB201322364D0 publication Critical patent/GB201322364D0/en
Publication of GB2511608A publication Critical patent/GB2511608A/en
Publication of GB2511608A8 publication Critical patent/GB2511608A8/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Withdrawn legal-status Critical Current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
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • 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
    • F02D41/0002—Controlling intake air
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0005—Controlling intake air during deceleration
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • 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
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • 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
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • 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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Disclosed is a method for operating an internal combustion engine 10 of a vehicle. The engine 10 comprises an intake system 16 for guiding air to at least one combustion chamber 14 of the engine 10, a throttle valve 24 for adjusting an amount of air to be guided to the combustion chamber 14 via the intake system 16, the throttle valve 24 being arranged in the intake system 16 and a fuel supply system 22 for supplying the combustion chamber 14 with fuel. A fuel cut-off mode in which the fuel supply to the combustion chamber 14 is cut off is activated when an actuation of an actuating element 44 for decelerating the vehicle, such as a brake pedal, is detected and the combustion chamber 14 is supplied with air via at least one bypass duct 26 of the intake system 16 during the fuel cut-off mode, the air flowing through the bypass duct 26 bypassing the throttle valve 24.

Description

Method for Operating an Internal Combustion Engine of a Vehicle The invention relates to a method for operating an internal combustion engine (10) of a vehicle JR 2011043110 A shows a control device for a vehicle in which a transmission having a continuously varying speed change ratio is connected to the output side of an engine where a power loss is decreased according to increase of the intake air quantity in a state of rotating without being supplied with fuel. When engine rotation speed in deceleration exceeds a preset return rotation speed, fuel supply to the engine is stopped, the speed change ratio is increased with decrease of vehicle speed during the deceleration in which the fuel supply is stopped, and the intake air quantity is increased according to the increase of the speed change ratio. The control device performs control for reducing the increased intake air quantity when fuel supplied with the engine is restarted.
KR 10 2011 0131773 A shows a fuel-cut control device and method for an electronic throttle control vehicle to reduce pumping loss by opening a throttle valve to a target level in a fuel-cut stroke.
Moreover, a system for a vehicle is known from US 201 3/0080031 Al. The system comprises a rate of change module that determines a rate of change of an engine speed.
The system further comprises a period estimation module that, while an engine is being fueled, determines an estimated period of a next deceleration fuel cut-off (DECO) event based on the rate of change of the engine speed. This system further comprises a DECO control module that selectively generates a DECO signal based on the estimated period.
Eurthermore, the system comprises an injection control module that cuts off fuel to the engine when the DECO signal is generated.
Moreover, DE 10 2011 010 068 A shows a method for operating an internal combustion engine, the method comprising determining an expected drag moment for the internal combustion engine during an overrun mode of the engine. The method further comprises selecting a DFCO-speed to deactivate a fuel cut-off in the overrun mode of the internal combustion engine in dependency on the expected drag moment, wherein the steps of determining the drag moment and selecting the DECO-speed are repeated steadily.
It is an object of the present invention to provide a method for operating an internal combustion engine by means of which method a particularly efficient operation of the engine can be realized.
This object is solved by a method having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are indicated in the other patent claims.
In order to provide a method for operating an internal combustion engine by means of which method a particularly efficient operation of the internal combustion engine and the vehicle can be realized, according to the present invention the engine comprises an intake system for guiding air to at least one combustion chamber of the engine. The engine further comprises a throttle valve for adjusting an amount of air to be guided to the combustion chamber via the intake system, the throttle valve being arranged in the intake system. Moreover, the engine comprises a fuel supply device for supplying the combustion engine chamber with fuel. In said method a fuel cut-off mode is activated when an actuation of an actuating element for decelerating the vehicle is detected. Eor example, said actuating element is a brake paddle of the vehicle. In said fuel cut-off mode the fuel supply to the combustion chamber is cut-off. Moreover, the combustion chamber is supplied with air via at least one bypass duct of the intake system during the fuel cut-off mode, the air flowing through the bypass duct bypassing the throttle valve.
In a particularly advantageous embodiment of the invention a valve element arranged in an exhaust tract for guiding exhaust of the engine is moved from a first position into a second position in the fuel cut-off mode. In the second position at least a portion of the exhaust tract is fluidically blocked by the valve element thereby increasing an exhaust back pressure with respect to the first position in which the portion of the exhaust tract is unblocked. By cutting off the fuel supply the fuel consumption of the engine can be kept particularly low overall. However, fresh air can flow into the combustion chamber during the fuel cut-off mode so that a particularly efficient engine braking can be realized since high pumping losses occur during the fuel cut-off mode. Thus, a particularly effective and efficient deceleration of the vehicle can be realized. Moreover, a particularly effective engine braking can be realized by moving the valve element into the second position.
Since the vehicle can be decelerated very effectively by the method, i.e. during the fuel cut-off mode the use and, thus, the wear of the service brake of the vehicle can be kept particularly low. The service brake is also referred to as a "driving brake". This results in a very long life of the service brake.
In a further advantageous embodiment of the invention, an ignition system for igniting a fuel air mixture in the combustion chamber is deactivated during the duel cut-off mode.
This results in a very long life of a spark plug for igniting the mixture.
Further advantages, features, and details of the invention derive from the following description of a preferred embodiment as well as from the drawing. The features and feature combinations previously mentioned in the description as well as the features and feature combinations mentioned in the following description of the figures and/or shown in the figures alone can be employed not only in the respective indicated combination but also in any other combination or taken alone without leaving the scope of the invention.
The drawing shows in: Fig. 1 a schematic view of an internal combustion engine of a vehicle, the engine being operated by a method in which a fuel cut-off mode is activated when a deceleration of the vehicle is detected, Fig. 1 showing a normal operation of the engine; and Fig. 2 a schematic view of the internal combustion engine, Fig. 2 illustrating the fuel cut-off mode.
Fig. 1 shows an internal combustion engine 10 for a vehicle, in particular a motor vehicle.
The internal combustion engine comprises a cylinder block 12 having a plurality of combustion chambers in the form of cylinders 14. The internal combustion engine 10 further comprises an intake system 16 for guiding air to the cylinders 14. For this purpose the intake system 16 comprises a duct 18 through which air can flow. The intake system 16 further comprises an air filter 20 by means of which the air flowing into the intake system 16 can be filtered.
The internal combustion engine 10 comprises a fuel supply system 22 for supplying the cylinders 14 with liquid fuel. For example, the fuel supply system 22 comprises a carburettor. Alternatively, the fuel supply system 22 can comprise at least one injector by means of which the fuel can be injected into the duct 18. The fuel injected into the duct 18 can be transported into the cylinders 14 by means of the air flowing through the duct 18 and into the cylinders 14. Alternatively, the fuel supply system 22 can comprise injectors by means of which the fuel can be injected directly into the cylinders 14. For example, the internal combustion engine 10 is designed as a gasoline engine.
The internal combustion engine 10 comprises a throttle valve 24 for adjusting an amount of air to be guided to the cylinders 14 via the intake system 16. As can be seen from Fig. 1, the throttle valve 24 is arranged in the duct 18. Moreover, the throttle valve 24 is movable between an open position shown in Fig. 1 and a closed position shown in Fig. 2.
The intake system 16 further comprises a bypass duct 26. On one side, the bypass duct 26 is fluidically connected to the duct 18 at a first position 28. On the other side, the bypass duct 26 is fluidically connected to the duct 18 at a second position 30. As can be seen from Fig. 1, the first position 28 is arranged upstream of the fuel supply system 22 and the throttle valve 24. The second position 30 is arranged downstream of the fuel supply system 22 and the throttle valve 24 and upstream of the cylinders 14.
The intake system 16 further comprises a valve element 32 arranged in the bypass duct 26. The valve element 32 is movable between a closed position shown in Fig. 1 and an open position shown in Fig. 2. In the closed position the bypass duct 26 is fluidically blocked by means of the valve element 32 so that air cannot flow through the bypass duct 26.
The internal combustion engine 10 further comprises an exhaust tract 34 for guiding exhaust gas of the internal combustion engine 10. The exhaust tract 34 comprises an exhaust duct 36 through which exhaust gas from the cylinders 14 can flow.
The exhaust tract 34 comprises a valve element 38 which is movable between an open position shown in Fig. 1 and a closed position shown in Fig. 2. An exhaust after treatment system 40 is arranged in the exhaust tract 34. The exhaust gas can be after treated by means of the exhaust after treatment system 40. The internal combustion engine 10 further comprises an electronic control unit (ECU) 42 for controlling the throttle valve 24, the valve element 32 and the valve element 38.
The vehicle comprises an actuating element in the form of a brake paddle 44 which can be actuated by the drive of the vehicle. By actuating the brake paddle 44 a driving brake of the vehicle can be activated in order to decelerate the vehicle.
Fig. 1 shows the internal combustion engine 10 in a normal mode, i.e. in a normal operation. In the normal mode the throttle valve 24 and the valve element 38 are open and the valve element 32 is closed. The normal mode is activated when the brake paddle 44 is not actuated so that a brake switch is off.
If the driver actuates the brake paddle 44 the internal combustion engine 10 is switched from the normal mode into a fuel cut-off mode shown in Fig. 2. In other words, the fuel cut-off mode is activated when an actuation of an actuating element for decelerating the vehicle is detected. By actuating the brake paddle 44, the brake switch is on.
In the normal mode the cylinders 14 are supplied with fuel by means of the fuel supply system 22. Moreover, air can flow into the cylinders 14 through the duct l8so that an air fuel mixture in the cylinders 14 is generated in the normal mode. The air fuel mixture is ignited thereby effecting a combustion of the air fuel mixture.
In the fuel cut-off mode the fuel supply to the cylinders 14 is cut off, in particular at low idle conditions. Moreover, the throttle valve 24 is in its closed position so that air cannot flow through the duct 18. The valve element 32 is in its open position so that the cylinders 14 are supplied with fresh air via the bypass duct 26. The air flowing through the bypass duct 26 bypasses the throttle valve 24 and the fuel supply system 22 as can be seen from Fig. 2. Moreover, the valve element 38 is in its closed position in the fuel cut-off mode. In the closed position at least a portion of the exhaust duct 36 is fluidically blocked by the valve element 38 with respect to the open position in which the portion is unblocked.
Thereby, a high exhaust back pressure can be realized. Since the cylinders 14 are not supplied with fuel during the fuel cut-off mode the fuel consumption of the engine 10 can be kept particularly low overall. Moreover, the operation of spark plugs for igniting the air fuel mixture is cut off in the fuel cut-off mode. By cutting off or deactivating the spark plugs, electrical energy can be saved. For example, the fuel cut-off mode is activated when the vehicle drives downhill. Since the cylinders 14 can be supplied with a particularly high amount of air in the fuel cut-off mode a particularly high engine brake efficiency as well as exhaust brake efficiency can be realized due to very high pumping losses.
For example, the valves (throttle valve 24, valve element 32 and valve element 38) are operated electronically or pneumatically, in particular by electronic or pneumatic switches controlled through logics programmed on electronic control units. Alternatively, the valves can be operated by at least one electro-mechanical actuator. Basically, a maximum air mass inducted into the cylinders 14 will increase pumping losses resulting in a particularly high vehicle deceleration during exhaust brake operation. During this exhaust brake operation the fuel supply is cut off which results in an improve fuel economy.
For example, the electronic control unit 42 receives and verifies signals, for example, CAN signals characterizing the speed of the engine, the speed of the vehicle, the actuation of the brake paddle 44, an actuation of a clutch and a gear position and outputs controlling signals in order to move the valve into the respective positions.
List of reference signs internal combustion engine 12 cylinder block 14 cylinder 16 intake system 18 duct air filter 22 fuel supply system 24 trottle valve 26 bypass duct 28 first position second position 32 valve element 34 exhaust tract 36 exhaust duct 38 valve element exhaust after treatment system 42 electronic control unit 44 brake paddle

Claims (5)

  1. Claims A method for operating an internal combustion engine (10) of a vehicle, the engine (10) comprising: -an intake system (16) for guiding air to at least one combustion chamber (14) of the engine (10); -a throttle valve (24) for adjusting an amount of air to be guided to the combustion chamber (14) via the intake system (16), the throttle valve (24) being arranged in the intake system (16); and -a fuel supply system (22) for supplying the combustion chamber (14) with fuel; wherein a fuel cut-off mode in which the fuel supply to the combustion chamber (14) is cut off is activated when an actuation of an actuating element (44) for decelerating the vehicle is detected, and wherein the combustion chamber (14) is supplied with air via at least one bypass duct (26) of the intake system (16) during the fuel cut-off mode, the air flowing through the bypass duct (26) bypassing the throttle valve (24).
  2. 2. The method according to claim 1, characterised in that in the fuel cut-off mode a valve element (38) arranged in an exhaust tract (36) for guiding exhaust of the engine (10) is moved from a first position into a second position in which the at least a portion of the exhaust tract (36) is fluidically blocked by the valve element (38) thereby increasing an exhaust back pressure with respect to the first position in which the portion is unblocked.
  3. 3. The method according to any one of claims 1 or 2, characterised in that the throttle valve (24) is closed during the fuel cut-off mode.
  4. 4. The method according to any one of the preceding claims, characterised in that the fuel supply system (22) is bypassed by the bypass duct (26), the air flowing through the bypass duct (26) bypassing the fuel supply system (22).
  5. 5. The method according to any one of the preceding claims, characterised in that the fuel cut-off mode is activated when an actuation of a brake pedal (44) of the vehicle is detected.
GB1322364.9A 2013-12-18 2013-12-18 Method for operating an internal combustion engine of a vehicle Withdrawn GB2511608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1322364.9A GB2511608A (en) 2013-12-18 2013-12-18 Method for operating an internal combustion engine of a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1322364.9A GB2511608A (en) 2013-12-18 2013-12-18 Method for operating an internal combustion engine of a vehicle

Publications (3)

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GB201322364D0 GB201322364D0 (en) 2014-02-05
GB2511608A true GB2511608A (en) 2014-09-10
GB2511608A8 GB2511608A8 (en) 2014-10-01

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GB1322364.9A Withdrawn GB2511608A (en) 2013-12-18 2013-12-18 Method for operating an internal combustion engine of a vehicle

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113147632B (en) * 2021-05-17 2023-03-07 中国第一汽车股份有限公司 Vehicle control method and device, vehicle and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391243A (en) * 1981-09-11 1983-07-05 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus of supplying fuel in electronic control fuel injection engine
US4494505A (en) * 1982-01-07 1985-01-22 Nissan Motor Company, Limited Deceleration control device for an internal combustion engine
JPS61155633A (en) * 1984-11-29 1986-07-15 Toyota Motor Corp Idling speed control device of internal-combustion engine
US4799466A (en) * 1984-11-29 1989-01-24 Toyota Jidosha Kabushiki Kaisha Deceleration control device of an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391243A (en) * 1981-09-11 1983-07-05 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus of supplying fuel in electronic control fuel injection engine
US4494505A (en) * 1982-01-07 1985-01-22 Nissan Motor Company, Limited Deceleration control device for an internal combustion engine
JPS61155633A (en) * 1984-11-29 1986-07-15 Toyota Motor Corp Idling speed control device of internal-combustion engine
US4799466A (en) * 1984-11-29 1989-01-24 Toyota Jidosha Kabushiki Kaisha Deceleration control device of an internal combustion engine

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Publication number Publication date
GB201322364D0 (en) 2014-02-05
GB2511608A8 (en) 2014-10-01

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