WO2008115132A1 - Système de commande de frein et procédé de commande d'un système de freinage - Google Patents

Système de commande de frein et procédé de commande d'un système de freinage Download PDF

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Publication number
WO2008115132A1
WO2008115132A1 PCT/SE2008/050269 SE2008050269W WO2008115132A1 WO 2008115132 A1 WO2008115132 A1 WO 2008115132A1 SE 2008050269 W SE2008050269 W SE 2008050269W WO 2008115132 A1 WO2008115132 A1 WO 2008115132A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
driver
hill hold
hold operation
seat belt
Prior art date
Application number
PCT/SE2008/050269
Other languages
English (en)
Inventor
Daniel Frylmark
Magnus Staaf
Original Assignee
Scania Cv Ab (Publ)
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 Scania Cv Ab (Publ) filed Critical Scania Cv Ab (Publ)
Publication of WO2008115132A1 publication Critical patent/WO2008115132A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/122—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger for locking of reverse movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor
    • B60R2022/4816—Sensing means arrangements therefor for sensing locking of buckle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor
    • B60R2022/4825—Sensing means arrangements therefor for sensing amount of belt winded on retractor

Definitions

  • the present invention relates to a method of controlling a braking system of a motor vehicle according to the preamble of claim 1 .
  • the invention also relates to a brake control system for a motor vehicle according to the preamble of claim 4.
  • the invention relates to a computer program comprising computer program code for implementing a method according to the invention, a computer program product comprising a data storage medium readable by an electronic control unit and having said computer program stored thereon, and an electronic control unit.
  • Heavy motor vehicles such as lorries, towing vehicles and buses, are often provided with a so-called Hill Hold function in order to make it easier and safer for the driver to drive off when the vehicle has been temporarily stopped in an uphill slope.
  • Hill Hold operation refers to an automatic braking operation in which the braking power of one or several brakes of a vehicle is automatically and temporarily maintained under certain given conditions when the driver of the vehicle releases the brake pedal.
  • a “Hill Hold operation” is effectuated in order to prevent the vehicle from rolling when the brake pedal has been released, so as to thereby make it easier for the driver to drive off after having stopped the vehicle temporarily in an uphill slope with the engine still running.
  • a Hill Hold operation is normally automatically initiated, under certain given conditions, when it is detected that the driver has released the brake pedal and the vehicle is standing still.
  • the braking power of one or sev- eral brakes of the vehicle is controlled so as to prevent the vehicle from rolling. This is normally accomplished by maintaining a suitable braking power on the ordinary wheel brakes of the vehicle.
  • the vehicle is retained and pre- vented from rolling backwards when the vehicle has been stopped in an uphill slope, despite the fact that the driver has released the brake pedal.
  • the driver may hereby take the required measures for driving off in an uphill slope, involving movement of the foot from the brake pedal to the accelerator pedal and depression of the accelerator pedal, without running the risk of the vehicle starting to roll backwards.
  • An initiated Hill Hold operation is automatically terminated and the braking power reduced to zero when it is detected that the driver is about to drive off.
  • an initiated Hill Hold operation should only be maintained as long as the driver remains seated in the driver's seat. Otherwise, there is a risk that the driver by mistake will rely on the Hill Hold function when leaving the vehicle. If an initiated Hill Hold operation is terminated before the driver has left the driver's seat when the vehicle is standing still in a slope, the driver is given a chance, while remaining seated, to notice that the parking brake has not been engaged.
  • an initiated Hill Hold operation is normally maintained as long as the clutch pedal is depressed by the driver and is terminated when it is detected that the clutch pedal has been released.
  • a depressed clutch pedal indicates that the driver is still seated in the driver's seat, whereas a release of the clutch pedal indicates that the driver is about to drive off or leave the driver's seat.
  • the object of the present invention is to propose a new and advantageous manner of controlling a Hill Hold operation of a motor vehicle, particularly of a motor vehicle provided with an automatic gearbox or an automatic clutch.
  • this object is achieved by a method having the features defined in claim 1 and a brake control system having the features defined in claim 4.
  • an initiated Hill Hold operation is automatically terminated when it is established that the driver is not wearing the seat belt.
  • the fact that the driver has released the seat belt is in this case taken as an indication that the driver intends to leave the driver's seat.
  • the invention also relates to a computer program having the features defined in claim 7, a computer program product having the features defined in claim 8 and an electronic control unit having the features defined in claim 9.
  • Fig 1 is a schematic perspective view of a towing vehicle
  • Fig 2 is a schematic outline diagram illustrating a system according to an embodiment of the present invention
  • Fig 3 is a schematic outline diagram of an electronic control unit for implementing a method according to the invention.
  • Fig 4 is a flow diagram illustrating a method according to an embodiment of the invention.
  • a motor vehicle 1 in the form of a towing vehicle is schematically illustrated in Fig 1 .
  • This vehicle 1 is provided with a number of brake cylinders 2, one for each vehicle wheel 3. Only the brake cylinder 2 of one of the vehicle wheels 3 is illustrated in Fig 1 .
  • the brake cylinder 2 is of conventional design.
  • a reciprocable push rod projecting from the brake cylinder 2 is operably connected to braking means 4 for holding the wheel 3 against rota- tion when the push rod is axially displaced into an advanced position and releasing the wheel for rotation when the push rod is axially displaced into a retracted position.
  • the displacement of the push rod is controlled by means of compressed air from a pneumatic circuit connected to the brake cylinder 2.
  • the magni- tude of the braking power exerted by the brake means 4 on the associated wheel 3 depends on the prevailing pneumatic pressure in the brake cylinder 2.
  • the vehicle 1 is provided with a brake control system 30 (sche- matically illustrated in Fig 2), which comprises brake control means 31 for controlling the pneumatic pressure in the brake cylinders 2, and thereby the braking power exerted by the braking means 4 on the vehicle's wheels 3.
  • the brake control means 31 may be adapted to generate a control signal for a valve de- vice 33, which in its turn controls the pneumatic pressure in the brake cylinders 2 in dependence on this control signal.
  • the brake control means 31 may be implemented by an electronic control unit 32 of the vehicle.
  • the brake control means 31 is adapted to initiate a Hill Hold op- eration, under certain given conditions, when receiving information indicating that the brake pedal 5 of the vehicle has been released as the vehicle is standing still.
  • the brake control means 31 is adapted to control the braking power of one or several braking means 4 of the vehicle during the Hill Hold operation so as to prevent the vehicle from rolling.
  • the brake control means 31 may for instance be adapted to initiate a Hill Hold operation when the brake pedal 5 of the vehicle is moved from a depressed position to a released position in a situation when the following conditions, optionally in combination with one or several further conditions, are simultaneously fulfilled:
  • Information as to the position of the brake pedal 5, i.e. information indicating whether the brake pedal is depressed or released, may be supplied to the brake control means 31 directly from a sensor 9 arranged to sense manoeuvring movements of the brake pedal 5, or from a control unit connected to such a sensor.
  • Information as to the present state of the ignition 6, i.e. informa- tion indicating whether the ignition is on or not, may for instance be supplied to the brake control means 31 directly from a sensor 10, for instance in the form of an electrical contact, arranged to sense manoeuvrings of the ignition, or from a control unit connected to such a sensor.
  • Information as to the present operational state of the vehicle engine 7, i.e. information indicating whether the engine is running or not, may for instance be supplied to the brake control means 31 directly from a sensor 1 1 arranged to sense the rotational speed of the engine output shaft 8, or from a control unit connected to such a sensor.
  • That the vehicle is standing still may be established based on information as to the present speed of the vehicle.
  • Information as to the present speed of the vehicle may be supplied to the brake control means 31 directly from a sensor arranged to sense the vehicle speed or from a control unit connected to such a sensor.
  • the speed of the vehicle may for instance be estimated based on measuring values of the rotational speed of some part of the vehicle's drive shaft, such as the output shaft 26 of the gearbox 27.
  • the vehicle speed is estab- lished by means of a sensor 12 arranged to generate a value representing the rotational speed of the gearbox output shaft 26.
  • Information as to the present operational state of the Hill Hold function i.e. information indicating whether the Hill Hold function is enabled or not, may for instance be supplied to the brake control means 31 directly from a switch 13 by means of which the driver of the vehicle is allowed to enable and disable the Hill Hold function or from a control unit connected to such a switch.
  • the brake control means 31 is adapted to automatically terminate an initiated and ongoing Hill Hold operation by ordering a reduction of the braking power of said one or several braking means 4 when receiving information indicating that the driver of the vehicle is not wearing the seat belt 14, i.e. that the seat belt 14 of the vehicle's driver seat 15 is not secured about the driver.
  • the brake control means 31 may be adapted to directly reduce said braking power to zero or, as an alternative, gradually reduce said braking power towards zero, so as to thereby allow the vehicle 1 to roll if standing in a slope. That the driver of the vehicle is not wearing the seat belt 14 may be established:
  • Information as to the locking state of the seat belt buckle 16, 17, i.e. information indicating whether or not the locking member 16 of the seat belt is secured to the associated locking device 17, may be supplied to the brake control means 31 directly from a sensor 18, for instance in the form of an electrical contact, arranged to sense said locking state or from a control unit con- nected to such a sensor.
  • Information as to the pull-out state of the seat belt 14, i.e. information indicating whether or not the seat belt is pulled out beyond the given threshold length, may be supplied to the brake control means 31 directly from a sensor 19 arranged to sense said pull-out state or from a control unit connected to such a sensor.
  • the brake control means 31 may be adapted to terminate an ini- tiated Hill Hold operation also when it is established that the driver's door 20 of the vehicle cabin 21 is open.
  • Information as to the position of the driver's door 20, i.e. information indicating whether the driver's door is open or not, may be supplied to the brake control means 31 directly from a sensor 22, for instance in the form of an electrical contact, arranged to sense the opening and closing of the door 20, or from a control unit connected to such a sensor.
  • the brake control means 31 is also, in a conventional manner, adapted to terminate an initiated Hill Hold operation when it is established that the driver is about to drive off. This may for in- stance be established when it is detected that the clutch 23 of the vehicle is engaged and that the accelerator pedal 24 of the vehicle has been depressed.
  • the brake control means 31 may also be adapted to actuate a warning indicator 25 when a Hill Hold operation is automatically terminated as a consequence of the establishment that the driver is not wearing the seat belt or that the driver's door is open.
  • the warning indicator 25 should generate a warning that is perceivable by the driver in the vehicle cabin 21 .
  • the warning is preferably a visible and/or audible warning signal, e.g. in the form of a flashing symbol on the instrument panel in the vehicle cabin and/or a buzzer.
  • FIG. 4 A flow diagram illustrating an embodiment of an inventive method of controlling a braking system of a motor vehicle is shown in Fig 4.
  • a first step S1 it is established whether or not a number of given conditions for an initiation of a Hill Hold operation are fulfilled. If this is not the case, step S1 is repeated after a certain time interval. If this is the case, a Hill Hold operation is initiated in a second step S2.
  • a third step S3 it is established whether or not a number of conditions for a termination of the Hill Hold operation are fulfilled. In this step S3, it is among other things established whether or not the driver of the vehicle is wearing the seat belt.
  • Step S3 is repeated after a certain time interval if it is established that the driver is wearing the seat belt and that no other condition for a termination of the Hill Hold operation is fulfilled.
  • the Hill Hold operation is terminated in step S4 if is established in step S3 that the driver is not wearing the seat belt or that another condition for a termination of the Hill Hold operation is fulfilled.
  • Computer program code for implementing a method according to the invention is suitably included in a computer program, which is loadable into the internal memory of a computer, such as the internal memory of an electronic control unit of a motor vehicle.
  • a computer program is suitably provided via a computer program product comprising a data storage medium readable by an electronic control unit, which data storage medium has the computer program stored thereon.
  • Said data storage medium is for instance an optical data storage medium in the form of a CD- ROM disc, a DVD disc etc, a magnetic data storage medium in the form of a hard disc, a diskette, a cassette tape etc, or a memory of the type ROM, PROM, EPROM or EEPROM or a Flash memory.
  • Fig 3 very schematically illustrates an electronic control unit 32 comprising an execution means 35, such as a central processing unit (CPU), for executing computer software.
  • the execution means 35 communicates with a memory 37, for instance of the type RAM, via a data bus 36.
  • the control unit 32 also comprises data storage medium 38, for instance in the form of a memory of the type ROM, PROM, EPROM or EEPROM or a Flash memory.
  • the execution means 35 communicates with the data storage medium 38 via the data bus 36.
  • a computer program comprising computer program code for implementing a method according to the invention is stored on the data storage medium 38.
  • the invention is particularly applicable to a vehicle provided with an automatic gearbox or an automatic clutch, i.e. a clutch that is not controlled by the vehicle driver via a clutch pedal or any other type of clutch lever.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

La présente invention concerne un système de commande de frein pour un véhicule motorisé et un procédé de commande d'un système de freinage d'un véhicule motorisé. Une opération Hill Hold (retenue en pente) est automatiquement initiée, sous certaines conditions données, quand il est détecté que la pédale du frein (5) du véhicule a été relâchée alors que le véhicule est immobile. Une opération Hill Hold initiée est terminée quand il est établi que le conducteur du véhicule ne porte pas sa ceinture de sécurité (14).
PCT/SE2008/050269 2007-03-16 2008-03-12 Système de commande de frein et procédé de commande d'un système de freinage WO2008115132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700666-1 2007-03-16
SE0700666A SE0700666L (sv) 2007-03-16 2007-03-16 Bromsstyrsystem och förfarande för styrning av ett bromssystem

Publications (1)

Publication Number Publication Date
WO2008115132A1 true WO2008115132A1 (fr) 2008-09-25

Family

ID=39766149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050269 WO2008115132A1 (fr) 2007-03-16 2008-03-12 Système de commande de frein et procédé de commande d'un système de freinage

Country Status (2)

Country Link
SE (1) SE0700666L (fr)
WO (1) WO2008115132A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012038498A1 (fr) * 2010-09-23 2012-03-29 Continental Teves Ag & Co. Ohg Fonction d'immobilisation pour un véhicule automobile
GB2497131A (en) * 2011-12-02 2013-06-05 Knorr Bremse Systeme Trailer having a hill hold function
WO2021126139A1 (fr) * 2019-12-16 2021-06-24 Patten Jeff Van Dispositif d'alarme pour un frein de stationnement d'un véhicule
US11414078B2 (en) * 2019-08-06 2022-08-16 Subaru Corporation Vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853284A (en) * 1971-07-17 1974-12-10 Tokai Rika Co Ltd Passenger vehicle safety belt winding device with means for detecting the pulled-out length of a belt
US4632208A (en) * 1983-12-20 1986-12-30 Tokico Ltd. Vehicle braking system
US6086515A (en) * 1995-07-13 2000-07-11 Itt Manufacturing Enterprises Inc. Process and system for retaining a vehicle on an inclined roadway
US20060129299A1 (en) * 2002-10-24 2006-06-15 Mario Schmidt Method and device for controlling a roll-back prevention system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853284A (en) * 1971-07-17 1974-12-10 Tokai Rika Co Ltd Passenger vehicle safety belt winding device with means for detecting the pulled-out length of a belt
US4632208A (en) * 1983-12-20 1986-12-30 Tokico Ltd. Vehicle braking system
US6086515A (en) * 1995-07-13 2000-07-11 Itt Manufacturing Enterprises Inc. Process and system for retaining a vehicle on an inclined roadway
US20060129299A1 (en) * 2002-10-24 2006-06-15 Mario Schmidt Method and device for controlling a roll-back prevention system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012038498A1 (fr) * 2010-09-23 2012-03-29 Continental Teves Ag & Co. Ohg Fonction d'immobilisation pour un véhicule automobile
CN103140394A (zh) * 2010-09-23 2013-06-05 大陆-特韦斯贸易合伙股份公司及两合公司 用于机动车辆的保持功能
CN103140394B (zh) * 2010-09-23 2015-06-24 大陆-特韦斯贸易合伙股份公司及两合公司 用于车辆制动系统的方法和用于车辆的制动系统
US9132812B2 (en) 2010-09-23 2015-09-15 Continental Teves Ag & Co. Ohg Retaining function for a motor vehicle
GB2497131A (en) * 2011-12-02 2013-06-05 Knorr Bremse Systeme Trailer having a hill hold function
US11414078B2 (en) * 2019-08-06 2022-08-16 Subaru Corporation Vehicle
WO2021126139A1 (fr) * 2019-12-16 2021-06-24 Patten Jeff Van Dispositif d'alarme pour un frein de stationnement d'un véhicule

Also Published As

Publication number Publication date
SE0700666L (sv) 2008-09-17

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