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WO2002031645A1 - Systeme de sollicitation de couple - Google Patents

Systeme de sollicitation de couple Download PDF

Info

Publication number
WO2002031645A1
WO2002031645A1 PCT/US2001/031814 US0131814W WO0231645A1 WO 2002031645 A1 WO2002031645 A1 WO 2002031645A1 US 0131814 W US0131814 W US 0131814W WO 0231645 A1 WO0231645 A1 WO 0231645A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotational speed
torque
biasing
vehicle
biasing device
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.)
Ceased
Application number
PCT/US2001/031814
Other languages
English (en)
Inventor
Hyeongcheol Lee
Clive Mckenzie
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.)
Visteon Global Technologies Inc
Original Assignee
Visteon Global Technologies Inc
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 Visteon Global Technologies Inc filed Critical Visteon Global Technologies Inc
Priority to GB0212341A priority Critical patent/GB2372023B/en
Priority to DE10194553T priority patent/DE10194553T1/de
Priority to US10/130,171 priority patent/US6859715B2/en
Priority to JP2002534968A priority patent/JP2004511381A/ja
Publication of WO2002031645A1 publication Critical patent/WO2002031645A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/344—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear
    • B60K17/346—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear the transfer gear being a differential gear
    • B60K17/3462—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear the transfer gear being a differential gear with means for changing distribution of torque between front and rear wheels
    • B60K17/3465—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear the transfer gear being a differential gear with means for changing distribution of torque between front and rear wheels self-actuated means, e.g. differential locked automatically by difference of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/348—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed
    • B60K17/35—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches
    • B60K17/3505—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches with self-actuated means, e.g. by difference of speed

Definitions

  • This invention relates generally to the field of torque-biasing systems and, more particularly, to the field of torque-biasing systems for a vehicle with a first front wheel and a rear wheel.
  • Some conventional vehicles include all-wheel-drive capabilities. These vehicles power two wheels during high-traction situations to enhance fuel-economy, and power all four wheels during reduced-traction situations to enhance road traction and stability. Torque-biasing devices are conventionally used to transfer the torque output from the engine source away from a first wheel and towards a second wheel during the reduced-traction situation.
  • Torque-biasing devices are conventionally controlled based upon the difference between the rotational speeds of a first wheel and a second wheel. Once the torque-biasing device is activated, the vehicle powers all four wheels and the effect of the reduced- traction situation is hopefully minimized.
  • a problem arises, however, during a tight turning maneuver of the vehicle with a conventional torque-biasing system. During such maneuver, each of the four wheels of the vehicle track a different turning radius and, consequently, are turning at a different rotational speed.
  • the torque-biasing system may improperly interpret the different rotational speeds of the wheels as a reduced-traction situation and may improperly power all four wheels.
  • the powering of all four wheels causes a disturbing "crow hop" situation as the torque-biasing device attempts to reduce the rotational speed difference between the wheels of the vehicle, which must turn at a different rotational speed.
  • FIGURE 1 is a schematic view of the toque-biasing system of the preferred embodiment, shown in a vehicle.
  • the torque-biasing system 10 of the preferred embodiment includes a torque-biasing device 12 and a control unit 14.
  • the torque- biasing system 10 is preferably installed and used in a vehicle 16 having a first front wheel 18 with a first front rotational speed, a rear wheel 20 with a rear rotational speed, and an engine 22 with a torque output.
  • the torque-biasing system 10 is installed and used in an all-wheel-drive (“AWD") vehicle, such as a truck or so-called sport-utility-vehicle, having two front wheels, two rear wheels, and a longitudinally-mounted engine.
  • AWD all-wheel-drive
  • the torque-biasing device 12 functions as a "transaxle-type" torque-biasing device to transfer the torque output away from the rear wheels and towards the front wheels during a reduced-traction condition.
  • the torque-biasing system 10 may be installed and used in any suitable environment.
  • the torque-biasing system 10 may be installed and used in an AWD vehicle, such as a minivan or sedan, having a transversely- mounted engine.
  • the torque-biasing device 12 functions to transfer the torque output away from the front wheels and towards the rear wheels during a reduced-traction condition.
  • the torque-biasing device 12 of the preferred embodiment includes a conventional electrically-actuated multi-plate clutch, as typically sold under the trade- name TORQUE ON DEMAND by the BorgWarner company.
  • the torque-biasing device 12 may, however, include other suitable devices, such as a hydraulic or viscous-actuated multi-plate clutch or a gear, dog, or cone-type clutch without a multi-plate.
  • the particular choice for the torque-biasing device 12 may vary based on several factors, including the size and layout of the vehicle 16 and the torque output of the engine 22.
  • the control unit 14 of the preferred embodiment functions to determine when and how to bias the torque output to the front wheels and to the rear wheels 20, and to control the torque-biasing device 12 based on this determination.
  • the first function determining when and how to bias the torque output, is preferably accomplished in two steps. In the first step, the control unit 14 estimates a difference between the first front rotational speed and the rear rotational speed caused by the turning maneuver. In the second step, the control unit 14 derives a control signal based upon the estimated difference caused by the turning maneuver subtracted from a measured difference between the first front rotational speed and the rear rotational speed.
  • the first step estimating a difference caused by the turning maneuver, is preferably accomplished by receiving data for the first front rotational speed and the rear rotational speed and by using a series of mathematical algorithms based on a simplified geometry of the vehicle 16.
  • the data is preferably sent and received in any suitable format and by any suitable means, such as a communication's cable.
  • the A ⁇ m value is the
  • Rf, R r , and R values are the turning radii of the first front wheel 18, the rear wheel 20, and the vehicle 16, respectively, and are estimated with the following equations:
  • the C r constant is the spring constant of the rear
  • the M r value is the cornering force on the rear wheel 20 measured by
  • the R value - representing the turning radius of the vehicle 16- is the only other variable needed to calculate A ⁇ lt .
  • the turning radius of the vehicle 16 may be derived in two ways.
  • V out ⁇ "in ! equation the t constant is the track of the vehicle 16 (the measurement between the first front wheel 18 and the second front wheel 24) and the V mt and V m values are
  • V out and V m values are measured by the suitable sensors, as
  • °SWA value is a measured longitudinal velocity of the vehicle 16
  • SSR constant is a total steering system ratio of the vehicle 16
  • ⁇ swa value is the steering wheel
  • the data for the steering wheel angle is measured by a suitable sensor and communicated to the control unit 14.
  • control unit 14 After the first step, estimating a difference between the first front rotational speed and the rear rotational speed caused by the turning maneuver, the control unit 14 proceeds to the second step and derives a control signal.
  • the control signal is preferably based upon the estimated difference caused by the turning maneuver subtracted from the measured difference between the first front rotational speed and the rear rotational speed.
  • the second function of the control unit 14, controlling the torque- biasing device 12, is preferably accomplished by sending the control signal to the torque-biasing device 12.
  • the control signal is preferably sent and received in any suitable format and by any suitable means, such as a communications cable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

Cette invention se rapporte à un système de sollicitation de couple (10), qui comprend un dispositif de sollicitation de couple (12) et une unité de commande (14) conçus pour être utilisés dans un véhicule à moteur. Ce système de sollicitation de couple est installé de préférence dans un véhicule ayant une première roue avant (18) possédant une première vitesse de rotation et une seconde roue arrière (20) possédant une vitesse de rotation arrière, ainsi qu'un moteur (22) possédant une sortie de couple. L'unité de commande (14) fonctionne de façon à déterminer quand et comment solliciter la sortie de couple sur les roues avant et arrière, et de façon à commander le dispositif de sollicitation de couple (12) sur la base de cette détermination.
PCT/US2001/031814 2000-10-11 2001-10-11 Systeme de sollicitation de couple Ceased WO2002031645A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB0212341A GB2372023B (en) 2000-10-11 2001-10-11 Torque-biasing system
DE10194553T DE10194553T1 (de) 2000-10-11 2001-10-11 Drehmomentsteuersystem
US10/130,171 US6859715B2 (en) 2000-10-11 2001-10-11 Torque-biasing system
JP2002534968A JP2004511381A (ja) 2000-10-11 2001-10-11 トルク配分制御システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23948600P 2000-10-11 2000-10-11
US60/239,486 2000-10-11

Publications (1)

Publication Number Publication Date
WO2002031645A1 true WO2002031645A1 (fr) 2002-04-18

Family

ID=22902359

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2001/031814 Ceased WO2002031645A1 (fr) 2000-10-11 2001-10-11 Systeme de sollicitation de couple
PCT/US2001/031810 Ceased WO2002031644A1 (fr) 2000-10-11 2001-10-11 Systeme de modification du couple

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2001/031810 Ceased WO2002031644A1 (fr) 2000-10-11 2001-10-11 Systeme de modification du couple

Country Status (4)

Country Link
JP (2) JP2004511380A (fr)
DE (2) DE10194553T1 (fr)
GB (2) GB2372024B (fr)
WO (2) WO2002031645A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884653A (en) * 1986-08-08 1989-12-05 Toyota Jidosha Kabushiki Kaisha Method of controlling a four wheel drive vehicle
US6119061A (en) * 1999-09-30 2000-09-12 Caterpillar Inc. Method and apparatus for controlling an electro-hydraulic differential steering system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884653A (en) * 1986-08-08 1989-12-05 Toyota Jidosha Kabushiki Kaisha Method of controlling a four wheel drive vehicle
US4987967A (en) * 1986-08-08 1991-01-29 Toyota Jidosha Kabushiki Kaisha Method of controlling a four wheel drive vehicle
US6119061A (en) * 1999-09-30 2000-09-12 Caterpillar Inc. Method and apparatus for controlling an electro-hydraulic differential steering system

Also Published As

Publication number Publication date
GB2372023B (en) 2004-01-07
GB2372023A (en) 2002-08-14
JP2004511381A (ja) 2004-04-15
GB0212341D0 (en) 2002-07-10
GB2372024A (en) 2002-08-14
GB0212345D0 (en) 2002-07-10
DE10194455T1 (de) 2002-12-12
GB2372024B (en) 2003-07-02
WO2002031644A1 (fr) 2002-04-18
DE10194553T1 (de) 2002-12-12
JP2004511380A (ja) 2004-04-15

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