US20070113807A1 - Internal combustion engine comprising a variable valve lift system and a variable valve timing system, and a method for such an engine - Google Patents

Internal combustion engine comprising a variable valve lift system and a variable valve timing system, and a method for such an engine Download PDF

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Publication number
US20070113807A1
US20070113807A1 US11/556,726 US55672606A US2007113807A1 US 20070113807 A1 US20070113807 A1 US 20070113807A1 US 55672606 A US55672606 A US 55672606A US 2007113807 A1 US2007113807 A1 US 2007113807A1
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US
United States
Prior art keywords
vvt
valve lift
engine
mode shift
actuator
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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.)
Abandoned
Application number
US11/556,726
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English (en)
Inventor
Thomas Lyngfelt
Martin Litorell
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 Global Technologies LLC
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Ford Global Technologies LLC
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 Global Technologies LLC filed Critical Ford Global Technologies LLC
Assigned to VOLVO CAR CORPORATION reassignment VOLVO CAR CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LITORELL, MARTIN, LYNGFELT, THOMAS
Assigned to FORD GLOBAL TECHNOLOGIES, LLC reassignment FORD GLOBAL TECHNOLOGIES, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VOLVO CAR CORPORATION
Publication of US20070113807A1 publication Critical patent/US20070113807A1/en
Abandoned 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0203—Variable control of intake and exhaust valves
    • F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/024—Belt drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/04—Sensors
    • F01L2820/041—Camshafts position or phase sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/04—Sensors
    • F01L2820/042—Crankshafts position
    • 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
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/21—Control of the engine output torque during a transition between engine operation modes or states
    • 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

Definitions

  • the present invention relates to an internal combustion engine comprising a variable valve lift system and a variable valve timing (VVT) systems, and more particularly to operating the engine selectively in either of at least two valve lift modes.
  • VVT variable valve timing
  • An internal combustion engine can be provided with a variable valve lift system, for example a cam profile shift (CPS) system, and a variable valve timing (VVT) system.
  • a variable valve lift system for example a cam profile shift (CPS) system
  • VVT variable valve timing
  • CPS cam profile shift
  • VVT variable valve timing
  • a mode shift in the CPS system might cause a pressure pulse, which can affect the VVT-position.
  • the VVT angle can due to this effect have a control error of up to 10 CA (crankshaft angles).
  • a mode shift in the CPS system might affect the VVT-position.
  • the cause could be a friction change due to the different camlobes used in the CPS modes.
  • a CPS mode shift can cause a voltage shift affecting the VVT position.
  • this invention is directed to a method for minimizing torque steps when shifting modes in a variable valve lift system of an internal combustion engine.
  • VVT variable valve timing
  • the VVT actuator could be controllable by at least one control valve of a hydraulic system, the control valve being controllable by an engine control unit, whereby the control pulse is sent to the control valve.
  • the variable valve lift system comprises a valve lift shift actuator controllable by the same hydraulic system, a pressure pulse, positive or negative, caused by changing the valve lift mode and the physical connection by the hydraulic system between the VVT actuator and the valve lift shift actuator, can be counteracted by the provided control pulse, so that the VVT position is not affected.
  • VVT actuator could be controlled by some other type of system.
  • the VVT actuator could use an electric power supply which is controlled by an engine control unit.
  • the control pulse is sent after a time interval (Dt) following a signal for the valve lift mode shift.
  • the signal for the valve lift mode shift could be a signal from which a valve lift mode shift can be predicted.
  • the signal could be in the form of an internal command in an engine control unit.
  • the control pulse could be terminated by a decrement function.
  • FIG. 1 is a schematic view of parts of an internal combustion engine, including a variable valve timing system and a variable valve lift system, the latter in a low lift position,
  • FIG. 2 is a detail of the view in FIG. 1 , where the cam profiles have been shifted to a high lift position
  • FIGS. 3 and 4 are diagrams of engine control signals as functions of time.
  • FIG. 1 shows schematically parts of an internal combustion engine.
  • a camshaft I is driven by a crankshaft 2 via a belt (or chain) 3 , a crankshaft wheel 3 a , and a camshaft wheel 3 b in a manner known in the art.
  • the engine comprises a variable valve lift in the form of a cam profile shifting (CPS) system 4 , adapted to shift the lift profile of intake and/or exhaust valves of the engine, by changing the valve lift provided by camlobes 6 a , 6 b on the camshaft 1 .
  • CPS cam profile shifting
  • FIG. 1 only one valve, in the form of an intake valve 5 at a cylinder 5 a is shown. In this example, for each valve 5 there is provided one low lift camlobe 6 a and two high lift camlobes 6 b.
  • each of the camlobes 6 a , 6 b acts on valve actuators 4 a , 4 b , in the form of valve tappets, located between the camlobes and the valve.
  • the valve actuators can be fixed to each other by a valve lift shift actuator 4 c , here also referred to as a CPS actuator 4 c , in turn controllable by a hydraulic system 9 , indicated in FIG. 1 with broken lines.
  • the hydraulic system 9 can be, as is known in the art, used for manoeuvring a plurality of units of the engine, and comprises a hydraulic pump 9 a .
  • the CPS system 4 For control of the CPS actuator(s) 4 c , the CPS system 4 comprises a CPS actuator control valve 9 b in the hydraulic system 9 .
  • the CPS actuator control valve 9 b is controllable by an engine control unit (ECU) 7 .
  • the CPS actuator control valve 9 b can be of a known type, for example a solenoid valve, not further described here.
  • the ECU 7 has, as known, computational capabilities and storage capabilities, and can be formed by one device, or more than one physically separate, but logically connected devices.
  • valve actuators 4 a , 4 b are not fixed to each other by the CPS actuator 4 c , which results in the valve lift being controlled by the low lift camlobe 6 a .
  • the valve actuators 4 a , 4 b are fixed to each other by the CPS actuator 4 c , so that the valve motion is controlled by the high lift camlobes 6 b.
  • the CPS system can be provided in a variety of manners known in the art, for example as described in US5950583A.
  • the CPS actuator can be provided in alternative manners, and the CPS system can be adapted to assume more than two valve lift modes.
  • the engine also comprises a variable valve timing (VVT) system 8 , which is adapted to adjust the VVT position, i.e. set the camshaft I at desired angular positions in relation to the camshaft wheel 3 b .
  • VVT variable valve timing
  • the VVT system comprises a VVT actuator 8 a , for example of the type described in US6135077A, at the camshaft wheel 3 b .
  • the VVT actuator 8 a is adapted to mechanically change the VVT position, and is controllable by the hydraulic system 9 .
  • the VVT system comprises a VVT actuator control valve 9 c in the hydraulic system 9 , which could be of the same type as the CPS actuator control valve 9 b .
  • the VVT actuator control valve 9 c is also controllable by the ECU 7 . Also, by means of a connection 8 c to a cam phase detector and a connection 8 d to a crankshaft position detector, the ECU can determine a current value of the VVT position.
  • the VVT actuator 8 a with the VVT actuator control valve 9 c is integrating which means that a constant value of the signal from the ECU 7 to the VVT actuator control valve 9 c gives a constant flow of oil through the valve if the pressure drop over the valve is constant. Since the CPS system and the VTT system use the same hydraulic system, a CPS mode shift can result in a change of the oil pressure at the VVT actuator control valve 9 c . As described closer below, in order to compensate for this change of pressure, the VVT actuator control valve 9 c is activated so as to counteract the effect of the pressure change.
  • FIG. 3 shows signals of the ECU 7 in the form of a VVT actuator control valve signal 11 , and a CPS actuator control valve signal 12 .
  • a valve lift mode shift here also referred to as a cam profile mode shift
  • the ECU 7 sends a control pulse 14 for the VVT actuator in this example.
  • a signal is identified from which a valve lift mode shift is predicted.
  • the mode shift involves changing the cam profile mode from the low lift mode to the high lift mode.
  • the signal is in the form of an internal command in the ECU 7 .
  • the ECU sends a signal to the CPS actuator control valve 9 b .
  • the ECU 7 sends a control pulse 14 to the VVT actuator control valve 9 c.
  • the ECU 7 could send the control pulse 14 to the VVT actuator control valve 9 c at the end of a time interval following a time at which the ECU sends a signal to the CPS actuator control valve 9 b.
  • the control pulse 14 in this example includes a step to its maximum amplitude A, and is terminated by a decrement function F.
  • the control pulse 14 in FIG. 3 is defined as positive.
  • the control pulse 14 will result in a movement of the VVT actuator control valve 9 c so as for the pressure at the VVT actuator to be constant despite the pressure change in the hydraulic system caused by the CPS mode shift.
  • the control pulse 14 will counteract the effect of the cam profile shift on the VVT position.
  • the effect of the control pulse 14 is to counteract the influence of the cam profile mode shift on the VVT position.
  • the time interval Dt, and the amplitude A and the decrement function F of the control pulse 14 could be predetermined.
  • one or more of these parameters, Dt, A, F could be determined based on at least one engine operation related parameter, for example the engine speed and/or the oil temperature. Such determinations could be based on predetermined functions or tables mapping the time interval Dt, the pulse amplitude A and the pulse decrement function F to the engine operation related parameter(s).
  • the time interval Dt, the pulse amplitude A, and the decrement function F, or the functions for their determination, could be calibratable, i.e., they could be adjusted before operation so that an optimal effect of the control pulse 14 is achieved. More specifically, the shape of the control pulse should adapted to a shape of a pressure pulse in the hydraulic system caused by a CPS mode shift.
  • the time interval Dt is preferably chosen so that the VVT actuator 8 a response to the control pulse 14 occurs at the same time as the CPS mode shift affects the VVT position.
  • the delay between the CPS mode shift control signal and the time at which the CPS mode shift affects the VVT position can be due to, for example, a pressure pulse travelling through a hydraulic system adapted to control the CPS system as well as the VVT system.
  • a cam profile shift is made in the opposite direction in relation to the shift described with reference to in FIG. 3 .
  • the ECU sends a signal to the CPS actuator control valve 9 b in order to change the cam profile mode from the high lift mode to the low lift mode.
  • the ECU 7 sends a control pulse 14 to the VVT actuator control valve 9 c .
  • the control pulse 14 in FIG. 4 is negative instead of positive. Therefore, the pressure pulse sent to the VVT actuator 8 a , will result in the VVT actuator 8 a acting in the opposite direction in relation to the actuator action following the control pulse in FIG. 3 .
  • it can be suitable to provide control pulses to the VVT system having the same sign (positive or negative) for both types of CPS mode shifts, i.e. low lift to high lift and vice versa.
  • control pulse can have alternative shapes, for example it can be in the form of a constant amplitude pulse.
  • control pulse can be sent simultaneously as the ECU signal 12 for the cam profile shift.
  • the invention is equally applicable to engines where the VVT system and the CPS system are actuated by two separate hydraulic systems, or where any or both of the systems are actuated by some other type of system, for example including electromagnetic actuators. Further, the invention is equally applicable to engines with variable valve lift systems providing more than two valve lift modes. It should also be noted that the method according to the invention is equally applicable to engines with spark ignition and engines with compression ignition.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
US11/556,726 2005-11-18 2006-11-06 Internal combustion engine comprising a variable valve lift system and a variable valve timing system, and a method for such an engine Abandoned US20070113807A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05110938A EP1788224B1 (de) 2005-11-18 2005-11-18 Brennkraftmaschine mit variablem Ventilhub sowie Ventilsteuerung und Verfahren für eine solche Brennkraftmaschine
EP05110938.7 2005-11-18

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US20070113807A1 true US20070113807A1 (en) 2007-05-24

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US (1) US20070113807A1 (de)
EP (1) EP1788224B1 (de)
DE (1) DE602005010718D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080017144A1 (en) * 2006-06-28 2008-01-24 Martin Litorell Internal combustion engine comprising a variable valve lift profile system and a method for controlling valve lift profile shifting

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* Cited by examiner, † Cited by third party
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US5287830A (en) * 1990-02-16 1994-02-22 Group Lotus Valve control means
US5331583A (en) * 1992-06-19 1994-07-19 Hitachi, Ltd. Running-average/decimation filter for an oversampling A/D converter
US5881690A (en) * 1996-12-20 1999-03-16 Hyundai Motor Company System for variably controlling operation of an intake/exhaust valve for an internal combustion engine
US5950583A (en) * 1997-04-25 1999-09-14 Dr. Ing. H.C.F. Porsche Ag Valve gear of an internal-combustion engine
US6135077A (en) * 1997-11-07 2000-10-24 Toyota Jidosha Kabushiki Kaisha Valve timing changing apparatus for internal combustion engine
US6230675B1 (en) * 1999-05-19 2001-05-15 Honda Giken Kogyo Kabushiki Kaisha Intake valve lift control system
US6513469B2 (en) * 1999-02-15 2003-02-04 Unisia Jecs Corporation Variable valve operating system of internal combustion engine
US6574544B1 (en) * 1999-11-01 2003-06-03 Unisia Jecs Corporation Apparatus and method of valve timing control for internal combustion engine
US6581564B2 (en) * 2000-09-21 2003-06-24 Honda Giken Kogyo Kabushiki Kaisha Ignition time controller, ignition time control method and engine control unit for internal combustion engine
US6615129B2 (en) * 2001-05-24 2003-09-02 Delphi Technologies, Inc. Apparatus and method for two-step intake phased engine control system

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JPS643208A (en) * 1987-06-23 1989-01-09 Honda Motor Co Ltd Tappet valve system for internal combustion engine
FR2683024B1 (fr) 1991-10-28 1994-02-18 Devatec Sa Humidificateur par vaporisation.
JP2003286869A (ja) * 2002-03-27 2003-10-10 Toyota Motor Corp 筒内噴射式火花点火内燃機関
JP4416377B2 (ja) * 2002-05-16 2010-02-17 日産自動車株式会社 内燃機関の制御装置
DE602005013535D1 (de) 2005-11-18 2009-05-07 Ford Global Tech Llc Brennkraftmaschine mit einem Ventiltrieb mit variablem Ventilhub und Verfahren zur Steuerung des Ventilhubumschaltens

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287830A (en) * 1990-02-16 1994-02-22 Group Lotus Valve control means
US5331583A (en) * 1992-06-19 1994-07-19 Hitachi, Ltd. Running-average/decimation filter for an oversampling A/D converter
US5881690A (en) * 1996-12-20 1999-03-16 Hyundai Motor Company System for variably controlling operation of an intake/exhaust valve for an internal combustion engine
US5950583A (en) * 1997-04-25 1999-09-14 Dr. Ing. H.C.F. Porsche Ag Valve gear of an internal-combustion engine
US6135077A (en) * 1997-11-07 2000-10-24 Toyota Jidosha Kabushiki Kaisha Valve timing changing apparatus for internal combustion engine
US6513469B2 (en) * 1999-02-15 2003-02-04 Unisia Jecs Corporation Variable valve operating system of internal combustion engine
US6230675B1 (en) * 1999-05-19 2001-05-15 Honda Giken Kogyo Kabushiki Kaisha Intake valve lift control system
US6574544B1 (en) * 1999-11-01 2003-06-03 Unisia Jecs Corporation Apparatus and method of valve timing control for internal combustion engine
US6581564B2 (en) * 2000-09-21 2003-06-24 Honda Giken Kogyo Kabushiki Kaisha Ignition time controller, ignition time control method and engine control unit for internal combustion engine
US6615129B2 (en) * 2001-05-24 2003-09-02 Delphi Technologies, Inc. Apparatus and method for two-step intake phased engine control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080017144A1 (en) * 2006-06-28 2008-01-24 Martin Litorell Internal combustion engine comprising a variable valve lift profile system and a method for controlling valve lift profile shifting
US8151748B2 (en) 2006-06-28 2012-04-10 Volvo Car Corporation Internal combustion engine comprising a variable valve lift profile system and a method for controlling valve lift profile shifting

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Publication number Publication date
DE602005010718D1 (de) 2008-12-11
EP1788224A1 (de) 2007-05-23
EP1788224B1 (de) 2008-10-29

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Owner name: VOLVO CAR CORPORATION, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LYNGFELT, THOMAS;LITORELL, MARTIN;REEL/FRAME:018485/0953

Effective date: 20060117

Owner name: FORD GLOBAL TECHNOLOGIES, LLC, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VOLVO CAR CORPORATION;REEL/FRAME:018485/0992

Effective date: 20060123

STCB Information on status: application discontinuation

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