EP2509833A1 - Système de freinage d'un véhicule automobile à deux essieux et à deux voies - Google Patents

Système de freinage d'un véhicule automobile à deux essieux et à deux voies

Info

Publication number
EP2509833A1
EP2509833A1 EP10781878A EP10781878A EP2509833A1 EP 2509833 A1 EP2509833 A1 EP 2509833A1 EP 10781878 A EP10781878 A EP 10781878A EP 10781878 A EP10781878 A EP 10781878A EP 2509833 A1 EP2509833 A1 EP 2509833A1
Authority
EP
European Patent Office
Prior art keywords
brake
axle
electric motor
wheels
pedal
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Withdrawn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
EP10781878A
Other languages
German (de)
English (en)
Inventor
Ralf Stroph
Alfred Pruckner
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP2509833A1 publication Critical patent/EP2509833A1/fr
Withdrawn legal-status Critical Current

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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18109—Braking
    • B60W30/18127—Regenerative braking

Definitions

  • the invention relates to a braking system of a non-tracked biaxial two-lane motor vehicle.
  • a moving motor vehicle can be braked to a standstill by the driver of the vehicle by actuating a brake pedal or the like, with which the driver thus prescribes a negative propulsion request by means of the so-called service brake.
  • This service brake acts on all four wheels of a two-axle two-lane motor vehicle in order to achieve the highest possible deceleration values.
  • the solution to this problem consists in a braking system of a non-track bound two-axle two-lane motor vehicle with a first one of the two axes associated hydraulic service brake, provided on the wheels of this axis friction brakes by the driver of the motor vehicle by pressing a brake pedal or the like ..
  • the vehicle has a hydraulic service brake system and an electric motor service brake system, one of these systems being assigned to one of the two vehicle axles.
  • the (legal) safety regulations are due to the two fundamentally independent braking systems, but both are operated in parallel, by specifying a negative propulsion desire by the driver with his brake pedal or the like. Met.
  • brake booster is understood to mean any system which adds an additional force to the actuation force of the driver on the brake pedal or the like upon each actuation of the hydraulic service brake with which the friction linings of the friction brake are pressed against the brake disk or brake drum or the like ,
  • brake booster of the usual in passenger vacuum brake booster in mechanical Ü transmission path between the brake pedal and the displacer in the master cylinder;
  • alternative embodiments of a brake booster should also be detected. It is essential in the present case thus that one of the two axles of the vehicle is equipped with a hydraulic service brake which can be actuated by the driver alone without additional introduction of force and with which the vehicle can be brought to a standstill according to the requirements.
  • a brake booster only acting in exceptional cases such as in particular in critical driving situations system, which can produce independent of a specification or an operation of the driver preferably only on one of the wheels of an axle a braking effect, for example, to the vehicle to stabilize.
  • the other axis of the motor vehicle is braked by an electric motor, which can be realized especially under very little effort, if the motor vehicle can also be driven by an electric motor.
  • the same at least one electric motor which drives the wheel or the wheels of an axle can brake the wheel or wheels of this axle, preferably in a recuperative manner.
  • Such provided on one of the two axes electromotive service brake can slow down a lighter passenger car with sufficient delay to a standstill in cooperation with the provided on the other axis hydraulic service brake, since the electric motor in terms of its (a positive propulsion generating) drive function also for the braking function, which is preferably carried out in the recuperation of the electric motor, this can generate a sufficiently high torque.
  • an electromotive braking of an axis of the motor vehicle but also possible in that this axis and preferably each wheel of this braking by means of an electric motor brake service brake associated with an electric motor which actuates one of these axis and preferably a respective wheel associated friction brake.
  • Anti-lock function is integrated in the control of the electric motor of the electric motor service brake. It is known to control the vehicle brakes acting on the roadway via the wheels in such a way that no critical brake slip occurs between the wheels and the roadway. Such control is now also integrated into the timing chain between the brake pedal and the decelerating electric motor, i. on the basis of a predetermined by the driver with his brake pedal or the like negative propulsion desire of said electric motor of the electric motor service brake is controlled in such a way that no critical brake slip between or braked by the electric motor wheel or wheels and the road surface, in particular that it does not a blockage of the wheel or wheels comes.
  • a brake system according to the invention is thus designed in such a way that, in addition to a possibly independent electric motor of the electromotive service brake, no further brake power assistance is required.
  • the hydraulic brake system this is easily possible because a smaller hydraulic volume is required for the only hydraulically braked axis, which is why a comparison with previous hydraulic brake systems smaller master cylinder is sufficient and this can cause the same brake pressure at lower actuation force.
  • This lower braking force can be applied by the driver himself, so that it is possible to dispense with a brake booster.
  • an electric drive motor (of the vehicle), which is present in any case, is used as the electric motor of the electromotive service brake, in fact no independent braking force assistance is required for the service brake system of the vehicle.
  • the electromotive brake system with sufficiently strong electric motor which acts as a drive unit of the vehicle, no further electric motor must have, since this strong electric motor can achieve a sufficiently high braking effect even in recuperation. If this recuperation braking effect is insufficient, it is possible to let this electric motor decelerate even the driven axle.
  • a further electric motor which generates a braking effect on this axle which is not assigned to the hydraulic service brake, in particular in that this electric motor actuates a friction brake.
  • only at least one electric motor can be provided which actuates at least one friction brake on the axle to be braked by the electric motor. (The latter applies in particular in the event that the motor vehicle can not be driven by an electric motor).
  • a simple mechanical solution may be a lever arm that causes a changed pedal ratio over the pedal travel during actuation. This has the beginning of the operation of the brake pedal or the like. A small increase in the operating force on the pedal travel result, while towards the end of the possible pedal travel, a high increase in the operating force is provided over the actuating path.
  • the attached schematic diagram shows schematically an embodiment of the present invention.
  • the reference numeral 20 denotes a two-lane two-axle motor vehicle, which consequently has four wheels 21a and 21b and 22a and 22b.
  • the wheels 21 a and 21 b are part of the front axle 21 of the vehicle, while the wheels 22 a and 22 b are located on the vehicle rear axle 22.
  • each wheel 22a, 22b of the rear axle 22 is assigned its own electric motor 10 or 11, with which the respective wheel 22a, 22b can be driven and preferably decelerated in a regenerative manner.
  • the two electric motors 10, 11 thus form an electromotive service brake 10- 1 or are part of the same.
  • each front wheel 21a, 21b is associated with a brake, which are in the form of conventional friction brakes 12, 13 which are hydraulically actuated in the usual way, so that these hydraulically actuated friction brakes 12, 13 form a hydraulic service brake 12-13 or component are the same.
  • a pedal travel sensor 4 is provided, which detects the operating angle and thus the braking request of the driver.
  • the signals of this pedal travel sensor 4 are processed in a control unit 5 for the vehicle brake system, which will be discussed in more detail below.
  • the likewise forming part of the hydraulic service brake 12-13 master cylinder 1 is constructed in a manner known to those skilled in the art, this is not a (in two-circuit Bremsanalgen usual) tandem brake cylinder, but a single brake cylinder for a single hydraulic ( Brake) circuit of the hydraulic service brake 12-13.
  • This single hydraulic brake circuit is constructed following the master cylinder 1 substantially as usual, i. There are hydraulic lines via a valve and a so-called.
  • the just-mentioned hydraulic block 6 is part of the likewise already mentioned control unit 5 for the vehicle brake system, which contains many other elements known in the art.
  • control unit 5 for the vehicle brake system
  • only one pressure sensor 7 for measuring the hydraulic pressure in the hydraulic line leading from the brake cylinder 1 into the hydraulic block 6 is mentioned, as well as an electronic control unit 8, which is responsible for controlling said valves in the hydraulic block 6 and for controlling the electric motors 10, 11 is, as far as the latter act as electric motor service brake 10-11.
  • an anti-lock braking system is included, which, if necessary, in the manner known to the person skilled in the art on the respective wheels 21 a -. 22b so that no longer lasting locking of the wheels or no critical brake slip between the wheels 21a-22b and the roadway occurs.
  • This anti-lock system may also include, as known and customary, an Electronic Stability Program (ESP).
  • ESP Electronic Stability Program
  • the brake system of this motor vehicle 20 includes two so-called brake circuits, as is the case with such vehicles, consisting of the hydraulic service brake 12-13 assigned here to the front axle 21 and the electric motor service brake 10 assigned here to the rear axle -11.
  • the hydraulic service brake 12-13 it is essential that in the chain of action between the brake pedal 23 and the master brake cylinder 1 there is no brake booster otherwise usual in dual-circuit hydraulic service brakes. This has been explained in detail prior to the description of the embodiment.
  • the mechanical transmission device 2 provided between the brake pedal 23 and the master cylinder 1 or its displacer, which is not shown in the figure.
  • This is formed here by a simple lever mechanism or coupling gear, wherein further on the brake pedal 23 an over-center spring 3 engages.
  • the mechanical transmission device 2 represents a variable over the pedal travel, ie over the pivoting of the brake pedal 23 ratio with respect to the resulting displacement of the displacer in the master cylinder 1, such that upon actuation of the brake pedal approximately such a noticeable to the driver pedal feeling as a function of his pedal actuation adjusts, as is customary on the previous hydraulic brake systems with brake booster.
  • a desired pedal force course over the pedal travel can alternatively also solely by the mechanical Translation device 2 or alone by spring elements or the like. Are generated.
  • the two wheels 22a, 22b may be assigned a common electric motor which functions as a drive motor and as an electromotive service brake.
  • one or more electric motors can also actuate friction brakes on the vehicle axle equipped with the electromotive service brake or on its wheels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Regulating Braking Force (AREA)
  • Braking Elements And Transmission Devices (AREA)

Abstract

L'invention concerne un système de freinage d'un véhicule automobile (20) à deux essieux et à deux voies, comprenant un premier frein de service hydraulique attribué à l'un des deux essieux (21, 22), frein par lequel des freins à frottement (12, 13) prévus sur les roues (21a, 21b) de cet essieu (21) peuvent être actionnés de façon hydraulique par le conducteur du véhicule par l'actionnement d'une pédale de frein (23) ou similaire dans le sens d'une spécification d'une propulsion avant négative sans interposition d'un amplificateur de force de freinage, et un second frein de service à moteur électrique attribué à l'autre essieu (22), avec lequel les roues (22a, 22b) de cet autre essieu (22) sont freinées par le conducteur avec l'actionnement de la même pédale de frein (23) avec l'interposition d'un système antiblocage par au moins un moteur électrique (10, 11), qui est actionné de telle sorte qu'aucun glissement de freinage critique n'apparaît sur les roues (22a, 22b) de cet essieu (22). Dans le cas où le conducteur prédéfinit une propulsion positive du véhicule, le moteur électrique (10, 11) ralentissant les roues d'un essieu peut faire office d'ensemble d'entraînement du véhicule et entraîner la roue ou les roues (22a, 22b) de cet essieu (22). Comme alternative ou en supplément, un moteur électrique, qui actionne un frein à frottement attribué à cette roue, peut être attribué à chaque roue de l'essieu pouvant être freiné par moteur électrique.
EP10781878A 2009-12-09 2010-11-17 Système de freinage d'un véhicule automobile à deux essieux et à deux voies Withdrawn EP2509833A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009057648A DE102009057648A1 (de) 2009-12-09 2009-12-09 Bremssystem eines zweiachsigen zweispurigen Kraftfahrzeugs
PCT/EP2010/067695 WO2011069790A1 (fr) 2009-12-09 2010-11-17 Système de freinage d'un véhicule automobile à deux essieux et à deux voies

Publications (1)

Publication Number Publication Date
EP2509833A1 true EP2509833A1 (fr) 2012-10-17

Family

ID=43629107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10781878A Withdrawn EP2509833A1 (fr) 2009-12-09 2010-11-17 Système de freinage d'un véhicule automobile à deux essieux et à deux voies

Country Status (4)

Country Link
EP (1) EP2509833A1 (fr)
CN (1) CN102712305B (fr)
DE (1) DE102009057648A1 (fr)
WO (1) WO2011069790A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080257669A1 (en) * 2005-07-15 2008-10-23 Reuter David F Braking apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410006A1 (de) * 1984-03-19 1985-09-19 Alfred Teves Gmbh, 6000 Frankfurt Verfahren zur steuerung einer bremsanlage fuer kraftfahrzeuge und vorrichtung zur durchfuehrung des verfahrens
DE4239386A1 (de) 1992-11-24 1994-05-26 Teves Gmbh Alfred Bremsanlage für Kraftfahrzeuge mit elektrischem Antrieb
ATE383266T1 (de) * 2004-11-20 2008-01-15 Luk Lamellen & Kupplungsbau Einrichtung zur pedalkraftreduktion
DE102008005043A1 (de) * 2008-01-18 2009-07-23 Bayerische Motoren Werke Aktiengesellschaft Bremsanlage eines zweiachsigen zweispurigen Kraftfahrzeugs mit einer elektrischen Rekuperationsbremse
DE102008001013A1 (de) * 2008-04-04 2009-10-08 Robert Bosch Gmbh Hydraulische Fahrzeugbremsanlage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080257669A1 (en) * 2005-07-15 2008-10-23 Reuter David F Braking apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011069790A1 *

Also Published As

Publication number Publication date
CN102712305A (zh) 2012-10-03
CN102712305B (zh) 2014-11-05
WO2011069790A1 (fr) 2011-06-16
DE102009057648A1 (de) 2011-06-16

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