EP0906209A1 - Systeme de freinage hydraulique pour automobile a regulation antiblocage et circuiterie pour un systeme de freinage de ce type - Google Patents

Systeme de freinage hydraulique pour automobile a regulation antiblocage et circuiterie pour un systeme de freinage de ce type

Info

Publication number
EP0906209A1
EP0906209A1 EP97921800A EP97921800A EP0906209A1 EP 0906209 A1 EP0906209 A1 EP 0906209A1 EP 97921800 A EP97921800 A EP 97921800A EP 97921800 A EP97921800 A EP 97921800A EP 0906209 A1 EP0906209 A1 EP 0906209A1
Authority
EP
European Patent Office
Prior art keywords
pedal
brake
control
limit value
wheel
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
EP97921800A
Other languages
German (de)
English (en)
Inventor
Hans-Jörg Feigel
Ronald Bayer
Johann Jungbecker
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.)
Continental Teves AG and Co OHG
Original Assignee
ITT Manufacturing Enterprises 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 ITT Manufacturing Enterprises LLC filed Critical ITT Manufacturing Enterprises LLC
Publication of EP0906209A1 publication Critical patent/EP0906209A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/343Systems characterised by their lay-out
    • B60T8/344Hydraulic systems
    • B60T8/3484 Channel systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17Using electrical or electronic regulation means to control braking
    • B60T8/176Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1764Regulation during travel on surface with different coefficients of friction, e.g. between left and right sides, mu-split or between front and rear
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/42Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having expanding chambers for controlling pressure, i.e. closed systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/88Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/885Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry

Definitions

  • Hydraulic motor vehicle brake system with anti-lock control and circuit arrangement for such a brake system
  • the invention relates to a hydraulic motor vehicle brake system with electronic anti-lock control, with a pedal-operated brake pressure transmitter, with electrically actuable pressure medium inlet valves and outlet valves inserted into the pressure medium paths, with which the pressure medium inflow into the wheel brakes of the individual wheels and the pressure medium outflow into a pressure compensation tank the brake system can be controlled individually, with wheel sensors for determining the turning behavior of the wheels and with an electronic control circuit for evaluating the sensor signals, for recording the driving situation and for generating brake pressure control signals.
  • a circuit arrangement for a brake system with electronic anti-lock control also belongs to the invention.
  • Anti-lock braking systems or anti-lock braking systems are available in a wide range of types. Hydraulic systems in which the wheel brakes of the individual wheels on electrically operated hydraulic valves are connected to a multi-circuit brake pressure transmitter or master cylinder have proven particularly successful are connected. In the pressure medium path from the master cylinder to the wheel brake there is an inlet valve which is switched to passage in the basic position and which is switched over to locks in the constant maintenance or pressure reduction phase. A blocked in the rest position, switchable to passage outlet valve is located in a return line which leads from the wheel brake to the low pressure accumulator or - in the open systems - to the surge tank of the brake system. Depending on the system, a return pump (in closed systems) or a hydraulic pump delivering from the pressure expansion tank to the brake circuits (in open systems) is used to return the pressure medium derived in the pressure reduction phase.
  • ABS anti-lock braking systems
  • the object of the present invention is now to develop a pumpless ABS of this type which can be used without the pressure accumulator gets by and that, even in unfavorable situations, has the required high functional reliability.
  • a pumpless ABS is thus realized on the basis of an open system, which comprises one or more pedal travel sensors and which, by switching over to a safety control mode when certain conditions are present, enables and at the same time ensures a "completely" ABS control that the brake function is retained even under very unfavorable conditions.
  • a limit value for the pedal feed is determined as a function of the current driving (train) situation, the brake situation and the pedal travel, the switchover from the standard control mode to the safety rule being exceeded when this limit value is exceeded Mode.
  • the limit value is expediently specified as a function of the current vehicle deceleration, taking into account the volume absorption characteristic of the respective wheel brake.
  • SpGrenz S p g tart + Sp Reg> .
  • a circuit arrangement for a brake system of this type is specified in claims 10-17, which can in principle be used advantageously for pumpless ABS with low-pressure accumulator.
  • This circuit arrangement could also increase the functional reliability of an ABS equipped with a hydraulic pump, e.g. by ensuring the brake function in extremely unfavorable situations for which the auxiliary pressure supply or the hydraulic pump is not designed or is not sufficient.
  • FIG. 1 shows a schematic representation of the most important components of an anti-lock brake system according to the invention and 2 in the diagram the dependence of the pedal travel and the pedal limit values on the vehicle deceleration in a brake system according to FIG. 1.
  • the motor vehicle brake system consists of a brake pressure transmitter 1, which is designed here in the form of a tandem master cylinder 2 with an upstream, pedal-operated (pedal 7) vacuum booster 3.
  • the brake system also includes a surge tank 4 and a pedal travel sensor 5.
  • inlet valves EV bis in the rest position or basic position EV 4 .
  • exhaust valves AV j to AV 4 are the wheel brakes of the individual wheels VL, VR,
  • the brake system shown does not require an auxiliary pressure supply system or any hydraulic accumulators.
  • Each wheel VL, VR, HL, HR is equipped with a wheel sensor SI to S4, which in a known manner delivers a signal representing the turning behavior of the wheel to the inputs E of a control circuit 6.
  • This control circuit 6 symbolizes a hard-wired or - preferably - a program-controlled circuit arrangement based on microcontrollers, which processes the wheel signals supplied by the wheel sensors SI to S4 and generates brake pressure control signals by data processing. These are via outputs A. individual intake and exhaust valves EV 1 to EV 4 and AV 1 to AV 4 connected to the control circuit 6.
  • an "open" hydraulic system in which pressure reduction or pressure medium discharge into a pressure expansion tank is fundamentally possible without restriction.
  • a pedal travel sensor 5 is therefore necessary in order to be able to detect the maximum permissible pedal travel or the maintenance of a sufficient residual volume.
  • the displacement sensor 5 can advantageously be accommodated in a controller unit flanged to the master cylinder to avoid external cable routing.
  • the axial advance of the pedal linkage or a piston can be magnetically sensed with the aid of Hall sensors if such a displacement sensor is inserted into a corresponding recess in the wall of the master cylinder.
  • the brake pedal is operated by the driver with full foot force F.
  • the brake pressure rising due to the filling of the wheel brakes reaches the blocking pressure level.
  • the blocking tendency of the wheel in question is recognized from the wheel turning behavior and, via the control circuit 6 (FIG. 1), leads to the activation and blocking of the intake valve EV in question. If pressure reduction is required to restore wheel stability, additional Lent the associated exhaust valve AV for the calculated period of time or switched to passage.
  • ABS control which is expediently designed in such a way that it manages with the lowest possible volume throughput or volume outflow - of course without impairing the anti-lock control system.
  • the brake pedal movement during this braking process is detected and evaluated with the help of the displacement sensor 5; Expediently, the associated electronics are also accommodated in the control circuit 6.
  • the anti- lock control is switched from the standard control mode, in which a brake pressure reduction and re-increase is permitted in both the front and rear brakes, into a safety control mode.
  • this safety control mode only allows unhindered brake pressure build-up on the front wheels and brake pressure reduction on the rear wheels, as previously explained, in order to ensure that the braking effect and driving stability are brought about without or with at most very little pressure medium consumption.
  • the vehicle can only be braked with a slight deceleration b fZ due to the low coefficient of friction. Due to the low pressure, there is only relatively little brake fluid in the wheel brakes. A change to a roadway with a higher or maximum coefficient of friction (U h i gh ) can be expected at any time; in any case, this higher coefficient of friction should be wholly or at least one a large proportion can be used for the braking process without the maximum pedal travel S pmax being exceeded.
  • the control is therefore designed in such a way that with a relatively low vehicle deceleration b FZ - see FIG. 2 - the ABS control is not maintained until the maximum pedal position S pmax is reached. This is shown by the course of the curve S pGrenz as a function of the vehicle deceleration b h _ in FIG. 2.
  • the pedal position from which the ABS control is restricted when the coefficient of friction is low is S pG ⁇ . called enz .
  • the feed or pedal value limit value Spr ,,,.,!, According to FIG. 2 can be calculated as follows:
  • the feed or the pedal position when an anti-lock control system is used is designated S pStart .
  • a switch is made from the standard control mode to the safety control mode.
  • the control of the valves ensures that practically only brake pressure build-up on the front wheels and only brake pressure build-up on the rear wheels - apart from smaller corrective measures - is permitted or takes place.
  • the vehicle can only be braked according to the friction coefficients with a medium deceleration.
  • the wheel brakes are filled with brake fluid to different degrees.
  • a change to a higher or even maximum coefficient of friction on the side of the road where the coefficient of friction is currently low can be expected at any time.
  • the brake fluid volume required for this must be present in the master cylinder. According to the invention, no unrestricted ABS control up to the maximum feed S pmax is therefore permitted even in this driving situation.
  • the vehicle equipped with the brake system according to the invention is braked to a standstill with almost optimum deceleration while maintaining the steering ability and driving stability. If, as a result of a change to a higher coefficient of friction, the brake slip is clearly too low, the brake pressure on the front axle is increased further, but can no longer be reduced.
  • a feed limit value S pGrenz is then individually determined for each piston, which is decisive for the transition or the changeover from a standard control mode to a safety control mode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

L'invention concerne un système de freinage hydraulique à régulation antiblocage, qui contient comme principaux éléments un maître-cylindre (1) actionné par pédale, des soupapes d'admission et de sortie (EV1 à EV4, AV1 à AV4) à commande électronique, des capteurs de vitesse sur roue (S1 à S4) et un circuit de régulation électronique (6). Le maître-cylindre (1) est muni d'un ou de plusieurs détecteurs de course (5) servant à détecter directement ou indirectement la course (S) de la pédale. En fonction de la situation de conduite du moment, de la situation de freinage et de la course (S) de la pédale, la régulation antiblocage passe d'un mode de régulation standard à un mode de régulation de sécurité ne permettant sensiblement qu'une élévation de la pression de freinage au niveau des roues avant et une diminution de la pression au niveau des roues arrière pendant un processus de régulation antiblocage. Une valeur seuil (Spseuil) de l'avancement de la pédale est déterminée en fonction de la situation de conduite et de la situation de freinage. Lorsque cette valeur seuil est dépassée, le système passe en mode de régulation de sécurité.
EP97921800A 1996-06-19 1997-04-26 Systeme de freinage hydraulique pour automobile a regulation antiblocage et circuiterie pour un systeme de freinage de ce type Ceased EP0906209A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19624331A DE19624331B4 (de) 1996-06-19 1996-06-19 Hydraulische Kraftfahrzeugbremsanlage mit Blockierschutzregelung und Schaltungsanordnung für eine solche Bremsanlage
DE19624331 1996-06-19
PCT/EP1997/002174 WO1997048584A1 (fr) 1996-06-19 1997-04-26 Systeme de freinage hydraulique pour automobile a regulation antiblocage et circuiterie pour un systeme de freinage de ce type

Publications (1)

Publication Number Publication Date
EP0906209A1 true EP0906209A1 (fr) 1999-04-07

Family

ID=7797291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921800A Ceased EP0906209A1 (fr) 1996-06-19 1997-04-26 Systeme de freinage hydraulique pour automobile a regulation antiblocage et circuiterie pour un systeme de freinage de ce type

Country Status (5)

Country Link
US (1) US6193328B1 (fr)
EP (1) EP0906209A1 (fr)
JP (1) JP4138881B2 (fr)
DE (1) DE19624331B4 (fr)
WO (1) WO1997048584A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1044124A1 (fr) * 1998-01-07 2000-10-18 Continental Teves AG & Co. oHG Systeme de regulation de la dynamique du mouvement de vehicules et procede d'exploitation d'un tel systeme
FR2780368B1 (fr) * 1998-06-26 2000-11-10 Bosch Syst Freinage Procede et dispositif de freinage anti-blocage adaptif
JP2001260851A (ja) * 2000-03-22 2001-09-26 Aisin Seiki Co Ltd 車両用制動制御装置
WO2005075269A1 (fr) * 2004-02-06 2005-08-18 Continental Teves Ag & Co. Ohg Systeme de freinage de motocyclette
DE102004046940A1 (de) * 2004-02-06 2005-08-25 Continental Teves Ag & Co. Ohg Kraftradbremsanlage
DE102005052167A1 (de) * 2004-11-30 2006-06-01 Continental Teves Ag & Co. Ohg Verfahren zur Blockierschutz-Regelung für eine Bremsanlage eines Kraftfahrzeugs mit einem Antiblockiersystem
FR2928117B1 (fr) * 2008-03-03 2010-02-12 Peugeot Citroen Automobiles Sa Systeme de freinage permettant la mise en oeuvre d'un procede de controle de stabilite et de trajectoire
FR2928324B1 (fr) * 2008-03-04 2012-11-30 Peugeot Citroen Automobiles Sa Systeme de freinage avec controle de stabilite et de trajectoire.
FR2928326B1 (fr) * 2008-03-04 2012-11-30 Peugeot Citroen Automobiles Sa Systeme de freinage avec controle de stabilite et de trajectoire utilisant un dispositif de stockage d'energie ainsi qu'une pompe externe et procede de stockagre denergie associe.
FR2928889B1 (fr) * 2008-03-20 2015-03-06 Peugeot Citroen Automobiles Sa Systeme de controle de stabilite et de trajectoire d'un vehicule automobile utilisant un servofrein actif
DE102011005971B4 (de) * 2011-03-23 2021-08-26 Ford Global Technologies, Llc Verfahren sowie Vorrichtung zur Regelung eines Bremssystems
KR20130007819A (ko) * 2011-07-11 2013-01-21 현대자동차주식회사 하이브리드 차량용 파워팩의 냉각장치 및 냉각방법
DE102019135088A1 (de) * 2019-12-19 2021-06-24 Wabco Europe Bvba Antiblockier-Regelverfahren und Antiblockier-Regelsystem für ein Bremssystem eines Fahrzeugs

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DE1655383C3 (de) 1967-04-08 1974-02-28 Teldix Gmbh, 6900 Heidelberg Antiblockierregelsystem für eine kolbengesteuerte hydraulische Bremsanlage
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Also Published As

Publication number Publication date
US6193328B1 (en) 2001-02-27
JP4138881B2 (ja) 2008-08-27
WO1997048584A1 (fr) 1997-12-24
JP2001504055A (ja) 2001-03-27
DE19624331A1 (de) 1998-01-02
DE19624331B4 (de) 2005-11-03

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