EP1419076A1 - Procede de determination d'un defaut d'un capteur de pression ou d'un circuit de freinage - Google Patents

Procede de determination d'un defaut d'un capteur de pression ou d'un circuit de freinage

Info

Publication number
EP1419076A1
EP1419076A1 EP02794587A EP02794587A EP1419076A1 EP 1419076 A1 EP1419076 A1 EP 1419076A1 EP 02794587 A EP02794587 A EP 02794587A EP 02794587 A EP02794587 A EP 02794587A EP 1419076 A1 EP1419076 A1 EP 1419076A1
Authority
EP
European Patent Office
Prior art keywords
brake
vacuum
pressure
hydraulic
determined
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Withdrawn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
EP02794587A
Other languages
German (de)
English (en)
Inventor
Robert Schmidt
Ralf Reviol
Ralph Gronau
Tobias Scheller
Andreas Neu
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
Continental Teves AG and Co OHG
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
Priority claimed from DE10224590A external-priority patent/DE10224590A1/de
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1419076A1 publication Critical patent/EP1419076A1/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Withdrawn legal-status Critical Current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
    • B60T8/32—Arrangements 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
    • B60T8/34—Arrangements 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
    • B60T8/44—Arrangements 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
    • B60T8/441—Arrangements 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 using hydraulic boosters
    • B60T8/442—Arrangements 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 using hydraulic boosters the booster being a fluid return pump, e.g. in combination with a brake pedal force booster
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • 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
    • B60T8/32—Arrangements 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
    • B60T8/34—Arrangements 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
    • B60T8/48—Arrangements 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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
    • 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
    • B60T8/32—Arrangements 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
    • B60T8/88—Arrangements 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
    • 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
    • B60T8/32—Arrangements 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
    • B60T8/88—Arrangements 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
    • B60T8/885—Arrangements 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
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/403—Brake circuit failure

Definitions

  • the invention relates to a method for determining a malfunction or failure of a hydraulic pressure sensor and / or a hydraulic brake circuit of a hydraulic vehicle brake system with a vacuum brake booster.
  • the invention also relates to a method for braking force support for a vehicle brake system with at least two brake circuits with at least one pressure sensor, in which a malfunction or failure of a hydraulic pressure sensor and / or a hydraulic brake circuit is determined.
  • Vacuum brake booster less and less given Particularly in the cold start phase of the motor vehicle, there is hardly enough vacuum available for the booster to enable the vehicle to brake strongly.
  • Brake booster reaches the modulation point of the vacuum brake booster and if the driver continues to press the brake pedal, the pressure is increased further by a hydraulic pressure booster unit - with insufficient support of the vacuum brake booster - so that the driver obtains the desired one Receives braking power.
  • a hydraulic pressure booster unit - with insufficient support of the vacuum brake booster - so that the driver obtains the desired one Receives braking power.
  • the control point of the booster can e.g. can be detected by vacuum sensors (vacuum sensors) in the brake booster.
  • vacuum sensors vacuum sensors
  • One or two (hydraulic) pressure sensors can be used to generate a setpoint for the hydraulic brake pressure, which measure the hydraulic pressure in the two circuits, the pressure rod circuit and the floating piston circuit, of a tandem master brake cylinder (THZ).
  • the reference variable for the hydraulic brake booster can at least no longer be determined directly due to the omitted pressure sensor signal. If, for example, the THZ pressure rod circuit fails due to a leak in the cold start phase, the associated pressure sensor no longer detects pressure. Due to the missing command variable, the hydraulic pressure increasing unit of the system is not activated. There is no hydraulic boost. On the other hand, the vacuum in the
  • the brake booster is not sufficient to maintain the necessary pressure in the floating piston circuit or
  • a malfunction or a failure of a hydraulic pressure sensor and / or to determine a hydraulic brake circuit of a hydraulic vehicle brake system safely. Furthermore, a method is also to be provided in order to ensure at least the legal minimum delay even in the event of a pressure sensor failure.
  • the object is achieved in that in a method for determining a malfunction or failure of a hydraulic pressure sensor and / or a hydraulic brake circuit of a hydraulic vehicle brake system with a
  • Vacuum brake booster a malfunction or failure of a hydraulic pressure sensor and / or a hydraulic brake circuit on the basis of a comparison of a hydraulic pressure (hydraulic pressure) or variables derived therefrom with the vacuum situation or the
  • Control of the vacuum brake booster or variables derived therefrom is determined.
  • the "negative pressure situation" is particularly caused by the negative pressure prevailing in the working chamber or the
  • Negative pressure means a pressure that is less than or equal to the surrounding atmospheric pressure.
  • the hydraulic pressure is determined using at least one hydraulic pressure sensor and the vacuum situation or the modulation of the vacuum brake booster is determined using one or more vacuum sensors.
  • the hydraulic pressure in the brake circuit or master brake cylinder in question is determined by an assigned pressure sensor. This can preferably be in a hydraulic line from the master cylinder to the wheel brakes of the
  • the hydraulic vehicle brake system preferably has a hydraulic pressure sensor which senses the pressure in a hydraulic line from the master brake cylinder to the wheel brakes of the vehicle or in a chamber of a master brake cylinder, such as a tandem master brake cylinder, in order to detect the pressure in a brake circuit.
  • the vacuum situation of the vacuum brake booster is preferably determined here by measuring the vacuum with suitable sensors in the vacuum brake booster.
  • the pressure difference between the chambers of the vacuum brake booster can be sensed directly by a differential pressure vacuum sensor or two vacuum sensors are used, each of which separately senses the vacuum in the two chambers.
  • a malfunction or a failure of the hydraulic pressure sensor and / or the brake circuit is then determined in accordance with a negative pressure determined by the at least one vacuum sensor. Accordingly, according to the invention, a brake circuit failure in the case of hydraulic amplification can be determined with the aid of the sensors provided in the vacuum brake booster, advantageously using the vacuum sensors (in the vacuum and
  • the vacuum or variables derived therefrom is determined in the vacuum brake booster and derived with the hydraulic pressure or Variables compared and according to the comparison, a fault or failure of the pressure sensor and / or the associated brake circuit is concluded.
  • the pressures prevailing in a vacuum chamber and a working chamber of the vacuum brake booster are determined by means of two vacuum sensors with regard to the ambient atmospheric pressure (ambient pressure) and the vacuum situation or the modulation of the vacuum brake booster is determined on the basis of these pressures
  • a brake pressure to be controlled is preferably determined on the basis of the signals from the vacuum sensor and an applied brake pressure is determined by the pressure sensor, the brake pressure to be controlled and applied or variables derived therefrom being compared and according to the comparison for a malfunction or failure of the pressure sensor and / or of the associated brake circuit is closed.
  • a fault or a failure of the pressure sensor and / or the associated brake circuit is inferred if the brake pressure to be controlled is greater by at least approximately 10%, preferably by at least approximately 30%, based on the applied brake pressure than the applied brake pressure.
  • a fault or failure of the pressure sensor and / or the associated brake circuit is preferably concluded when the vacuum situation or modulation of the vacuum brake booster indicates a braking request by the driver and the braking request for at least one certain predetermined time period, preferably a time period in a range of approximately 10 msec. up to approx. 150 msec, particularly preferably approx. 100 msec, is recognized and if at the same time the hydraulic pressure in the brake circuit concerned is reduced or is already very low.
  • the driver's braking request is recognized when the vacuum brake booster is essentially fully controlled.
  • a full modulation is present when the modulation point is reached and this situation remains essentially the same, which can be determined in particular by the pressure in the working chamber.
  • a situation of full control is considered to be essentially constant if the pressure in the working chamber is less than 30 mbar, preferably less than 20 mbar, below the pressure at the control point.
  • the full modulation is determined on the basis of a pressure pedal travel characteristic curve or a characteristic curve derived therefrom, such as pressure pedal force characteristic curve, of the vacuum brake booster.
  • a basic characteristic curve is preferably specified, which can be changed in accordance with the signals of the vacuum sensor. This means that the characteristic curve is adapted to changing conditions of the brake system in order to optimize the accuracy of the detection of the modulation point.
  • the control of the hydraulic auxiliary force takes place in accordance with a detected pressure sensor error or a brake circuit failure, which is carried out by the method according to the invention for determining a malfunction or a failure of a hydraulic pressure sensor and / or a hydraulic brake circuit is recognized.
  • a subtask is solved with a method for braking force support for a vehicle brake system with at least two brake circuits with at least one pressure sensor, in which a malfunction or failure of a hydraulic pressure sensor and / or a hydraulic brake circuit is determined and which is characterized in that if a malfunction or If a failure of a hydraulic pressure sensor and / or a hydraulic brake circuit has been determined, hydraulic pressure is built up in a brake circuit that is not affected or in a brake circuit that is not associated with the pressure sensor in question.
  • the pressure is generated with a hydraulic auxiliary force, preferably by a hydraulic pump, in a still intact brake circuit.
  • Brake power support provided that a build-up of hydraulic pressure is carried out when the vacuum situation or modulation of the vacuum brake booster indicates a braking request by the driver for a specific, predetermined period of time and at the same time the hydraulic pressure in the brake circuit concerned is reduced or is already very low, that the Pressure continues to build up when the vacuum situation or modulation of the vacuum brake booster further indicates a braking request by the driver, and that the pressure build-up is aborted if the vacuum situation or modulation of the vacuum brake booster no longer indicates a braking request by the driver.
  • the driver's braking request is preferably recognized when the vacuum brake booster is essentially fully controlled. This means when the head point is reached and this situation remains essentially the same.
  • the situation of full modulation is considered to be essentially constant if the working chamber pressure is less than 30 mbar, preferably less than 20 mbar, below the pressure of the modulation point.
  • hydraulic pressure is built up by closing a separating valve, which is inserted into a hydraulic line between the vacuum brake booster or an adjoining master brake cylinder and a wheel brake, and by controlling an electric motor of a hydraulic pump which is in the hydraulic line between the Isolation valve and the wheel brake is inserted.
  • hydraulic pressure is reduced when the vacuum situation or modulation of the vacuum brake booster indicates that the driver releases the brake.
  • hydraulic pressure is reduced by opening a separating valve, which is inserted into a hydraulic line between the vacuum brake booster or an adjoining master brake cylinder and a wheel brake, the electric motor of a hydraulic pump operating in the hydraulic line between the
  • the isolation valve is an analogized electromagnetic valve.
  • valves arranged in this brake circuit are controlled in order to avoid a loss or further loss of pressure fluid.
  • a preferred hydraulic brake system for using the invention has an actuating device, preferably a brake pedal, a vacuum brake booster, an actuatable master brake cylinder and a pump, the pressure of which can be applied to at least one wheel brake of the vehicle and by means of which a hydraulic brake booster is generated, the Pump on the inlet side (suction side) can be connected to the master brake cylinder via at least one hydraulic one
  • Connection into which a changeover valve is inserted, and the pump on the output side (pressure side) can be connected to at least one wheel brake of the vehicle via at least one hydraulic connection and can be connected to the master brake cylinder via at least one hydraulic connection into which a separating valve is inserted.
  • Fig. 1 and Fig. 2a show a tandem master cylinder, which essentially has two series-connected master brake cylinders in one housing.
  • the tandem master brake cylinder is not actuated directly by the brake pedal because the foot power is usually insufficient. but operated via ballasts for power support by suction air, compressed air or hydraulic pressure.
  • the primary sleeve (3) first runs over the compensating bore (A) and the pressure chamber (D) is closed; the brake fluid is under the excess pressure transmitted to it. Since a liquid under excess pressure passes it evenly on all sides, the pressure chamber (D 1 ) receives over the
  • the vehicle's braking system has two circuits. If, for example, a leak occurs in the pressure rod-piston brake circuit (see Fig. 2c), no excess pressure can build up in the pressure chamber (D) when the brake pedal is depressed, since the brake fluid escapes through the leak. In this case, the pin (5) hits the pin (6) and transmits the pedal force mechanically via the intermediate piston (2) to the pressure chamber (D '). The connected intermediate piston brake circuit remains effective.
  • the THZ pressure of the brake circuit is at least approximately determined or estimated from the signals of at least one vacuum pressure sensor in the brake booster, preferably from two vacuum sensors or a double vacuum sensor.
  • 3 shows a device suitable for the method according to the invention using a brake system with active hydraulic amplification (OHB).
  • the dual-circuit brake system for motor vehicles shown in FIG. 3 consists of an actuation unit 41, e.g. a tandem master cylinder (THZ), with a vacuum brake booster 42 (booster) which is actuated by a brake pedal 43.
  • a storage container 44 is arranged on the actuation unit 41 and contains a pressure medium volume and is connected to the working chamber of the actuation unit 41 in the brake release position.
  • the illustrated brake circuit has one connected to a working chamber of the actuation unit 41
  • Brake line 45 which connects the actuation unit 41 with that of a hydraulic unit 22.
  • the brake line 45 has a separating valve 46, which forms an open passage for the brake line 45 in the rest position.
  • the separating valve 46 is a check valve 47 that opens in the direction of the wheel brakes 40, 40 ′.
  • the separating valve 46 also serves here as a pressure modulation unit. A pressure limiting function can be implemented with this valve 46 by setting a specific control current which is still limited at the top. An otherwise necessary pressure relief valve can thus advantageously be dispensed with.
  • the isolation valve 46 is actuated electromagnetically.
  • the isolation valve 46 is preferably an analogized valve. Because then in particular a continuous, “analog" setting of the pressure or a pressure reduction is possible.
  • the brake line 45 branches into two brake lines 48, 49, which each lead to a wheel brake 40, 40 '.
  • the brake lines 48, 49 each contain an electromagnetically actuated inlet valve 12, 19, which in its rest position is open and can be switched into a blocking position by excitation of the actuating magnet.
  • a check valve 13, which opens in the direction of the brake cylinder 41, is connected in parallel to each inlet valve 12, 19.
  • a so-called return circuit is connected in parallel to these wheel brake circuits and consists of return lines 15, 32, 33 with a pump 16.
  • the wheel brakes 40, 40 ' connect via an outlet valve 14, 17 via return lines 32, 33 to the return line 15 and thus to the suction side of the pump 16, the pressure side of which, with the brake pressure line 48, at an intersection point E between the isolating valve 46 and the inlet valves 12, 19 is connected.
  • the pump 16 is preferably designed as a reciprocating piston pump with a pressure valve (not shown) and a suction valve.
  • the pump 16 is used here as a pressure increasing unit for generating the additional hydraulic brake force support.
  • a check valve 34 opening to the pump is used.
  • the suction side of the pump 16 is connected to the brake cylinder 41 via a suction line 30 with a low pressure damper 18 and a changeover valve 31.
  • the signals from at least one vacuum pressure sensor 35 or 36 of the brake booster 42 preferably from both Vacuum sensors 35 and 36, also the THZ pressure of the brake circuits approximately determined or estimated by a pressure determination unit 53 of an electronic brake control unit.
  • the electronic control unit 52 is also assigned a fault detection 54 for the purpose of determining a fault or a suspected fault of a pressure sensor 10, 10 'on the basis of the estimated THZ pressure of the brake circuits in accordance with the signals determined by the vacuum pressure sensors 35 and / or 36.
  • the wheel speeds are determined by the wheel speed sensors 50, 51 and the signals supplied to the electronic brake control unit 52.
  • the second brake circuit has the same
  • the brake system works in the "normal case” (without errors) as follows:
  • the electronic control unit 52 activates the pump 16 for generating pressure in the wheel brakes when the actuation point of the vacuum brake booster 42 is reached or exceeded. So there is a transfer from the pneumatic brake force support by the vacuum brake booster 42 to the brake force boost by the pump 16.
  • the pump fulfills the function of an active hydraulic
  • the brake system works according to the invention as follows:
  • the modulation point of the booster 42 is determined by the pressure determination unit 53.
  • the control point is reached when the pressure in the working chamber is equal to the surrounding atmospheric pressure.
  • Control point arrives. In particular, this reduces the Pressure in the working chamber again under atmospheric pressure, which is recognized on the basis of the signals from the vacuum sensor 36 or the vacuum sensors 35, 36. At this moment, the pressure build-up is interrupted by the pump of the intact brake circuit and the currently set brake pressure is maintained. If the driver continues to release the brake, pressure reduction begins via the analogized isolating valve in the intact brake circuit (isolating valve analogous to valve 46 of the defective brake circuit). The end of the brake application is recognized when the pressure in the
  • Working chamber is equal to the pressure in the vacuum chamber and the brake pressure is completely reduced.
  • the signals of the vacuum sensors 35,36 and a brake light switch can be used.
  • the driver's request can therefore be detected by the invention with the aid of the sensors in a system, the vacuum sensors 35, 36 in the booster 42, and the existing actuators, the pump 16 and valves, and even if a brake circuit fails with a pressure sensor or in the event of a leak in this circuit, a brake pressure adjusted to the driver's specification can be set. The driver is therefore provided with a meterable brake even in the event of a circuit failure of the pressure sensor circuit.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

L'invention concerne un procédé de détermination d'un défaut ou d'une panne d'un capteur de pression hydraulique et/ou d'un circuit de freinage hydraulique d'un système de freinage hydraulique comportant un servofrein à dépression. Selon ledit procédé, un défaut ou une panne d'un capteur de pression hydraulique et/ou d'un circuit de freinage hydraulique est déterminé sur la base d'une comparaison entre une pression hydraulique ou des grandeurs dérivées et une situation de dépression ou le contrôle de niveau du servofrein à dépression ou des grandeurs dérivées.
EP02794587A 2001-08-11 2002-08-09 Procede de determination d'un defaut d'un capteur de pression ou d'un circuit de freinage Withdrawn EP1419076A1 (fr)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DE10139676 2001-08-11
DE10139676 2001-08-11
DE10223052 2002-05-24
DE10223050 2002-05-24
DE10223050 2002-05-24
DE10223052 2002-05-24
DE10224590 2002-06-04
DE10224590A DE10224590A1 (de) 2001-08-11 2002-06-04 Verfahren zum Ermitteln einer Störung eines Drucksensors oder eines Bremskreises einer hydraulischen Fahrzeugbremsanlage
PCT/EP2002/008921 WO2003013922A1 (fr) 2001-08-11 2002-08-09 Procede de determination d'un defaut d'un capteur de pression ou d'un circuit de freinage

Publications (1)

Publication Number Publication Date
EP1419076A1 true EP1419076A1 (fr) 2004-05-19

Family

ID=27438002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02794587A Withdrawn EP1419076A1 (fr) 2001-08-11 2002-08-09 Procede de determination d'un defaut d'un capteur de pression ou d'un circuit de freinage

Country Status (3)

Country Link
EP (1) EP1419076A1 (fr)
JP (1) JP2004537464A (fr)
WO (1) WO2003013922A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1658210B1 (fr) * 2003-08-19 2007-08-22 Continental Teves AG & Co. oHG Systeme de freinage du type brake-by-wire avec module de surveillance
DE102007025960A1 (de) * 2007-06-04 2008-12-11 Robert Bosch Gmbh Verfahren zur Einstellung einer Bremsanlage in einem Fahrzeug
JP2009173266A (ja) * 2007-12-27 2009-08-06 Hitachi Ltd 電動倍力装置およびタンデムマスタシリンダ
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