WO2012163844A1 - Servofrein pneumatique présentant un dispositif capteur pour le contrôle, sans contact, de position et de déplacement d'une paroi mobile - Google Patents

Servofrein pneumatique présentant un dispositif capteur pour le contrôle, sans contact, de position et de déplacement d'une paroi mobile Download PDF

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Publication number
WO2012163844A1
WO2012163844A1 PCT/EP2012/059866 EP2012059866W WO2012163844A1 WO 2012163844 A1 WO2012163844 A1 WO 2012163844A1 EP 2012059866 W EP2012059866 W EP 2012059866W WO 2012163844 A1 WO2012163844 A1 WO 2012163844A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
unit
brake booster
pneumatic brake
movable wall
Prior art date
Application number
PCT/EP2012/059866
Other languages
German (de)
English (en)
Inventor
Jürgen Faller
Original Assignee
Continental Teves Ag & 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
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO2012163844A1 publication Critical patent/WO2012163844A1/fr

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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
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • 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
    • B60T13/24—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 the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. 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
    • 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
    • B60T13/24—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 the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements

Definitions

  • Pneumatic brake booster with a sensor device for non-contact monitoring of the position and movement of a movable wall.
  • the invention relates to a pneumatic brake booster, in particular for automotive vehicle brake systems, comprising a booster housing which is divided by at least one, can be acted upon with a pneumati ⁇ rule differential pressure axially movable wall into at least one vacuum chamber and at least one Häkam ⁇ mer, and a sensor device for contactless ⁇ loose monitoring of position and movement of the movable wall, which provides an electronic control unit electrical ⁇ Sig nal.
  • Automotive vehicle brake systems with a pneumatic brake booster for example, a current position of a Move ⁇ union wall within the brake booster used as a measure for the system state and the obtained information in the form of electrical signals to a control unit, a brake light switch or other units to be forwarded.
  • Separate sensor devices are used to monitor the position of the movable wall.
  • a pneumatic brake booster with a sensor device which comprises a disc-shaped magnet as a donor element and a Hall sensor as a sensor element, wherein the donor element is moved together with the movable wall and must be performed for position detection on the sensor element.
  • a disadvantage of this device is that the position can be detected only within a narrow range.
  • the sensor device is considered to be complicated in terms of their structure and the installation in the brake booster.
  • the object of the present invention is to provide an improved pneumatic brake booster with a sensor device which monitors the position and movement of the movable wall reliably and over the entire actuation path, simplifies installation in comparison with the prior art, and improves its ability to integrate into pneumatic systems Brake booster from ⁇ draws.
  • a sensor device for monitoring the position and movement of the movable wall of a brake booster according to the invention advantageously has a transmitting unit, a receiving unit and a reflection means, which is ge ⁇ suitable to reflect wavy signals.
  • sensor device can advantageously be imaged with different wave-shaped electromagnetic or sound signals, for example with radio, ultrasound, La ⁇ ser- or focused LED light signals.
  • a signal may be sent from the transmitting unit in the direction of the reflection means is reflected at the reflection means and can be registered as a Reflectors ⁇ pending signal echo from the receive unit and niege ⁇ directs ei ⁇ ne electronic control unit for further processing.
  • a further electronic Cont ⁇ roll unit can be provided within the sensor device.
  • the Kont ⁇ roll unit can be operatively connected between the electronic control unit on one side and transmitting unit or receiving ⁇ unit on the other side and are arranged in the same ⁇ Chen for integration of transmitting unit and the receiving unit provided component or the same housing.
  • the control unit can be used for converting control commands from the electronic control unit, for modulating the signal, for filtering and / or preprocessing the received signal echo, or for further purposes.
  • a current position of the movable wall can be particularly easily monitored and from a knowledge of the position of the movable wall further information about a current state of a motor vehicle brake system, such as an actuation request of the driver, a position of a piston in a master cylinder, operating state of an actuator and derived therefrom various actions and / or control commands, for example, to an actuator, an ABS or ESP device, a brake light switch, a pedal simulator and others are derived and initiated.
  • no moving transmitter element is necessary within the sensor device, which reduces assembly costs, lowers parts count and costs.
  • the position and BEWE ⁇ supply the movable wall reliably and are particularly easily monitored over the entire actuation.
  • a calibration of the sensor device for unambiguous position determination and / or error checking can be done electronically particularly easy, and it is possible to calibrate once, for example during the initial operation ⁇ acceptance or regularly, for example, after each braking process or another carried out separately identifiable event.
  • the transmitting unit and the receiving unit can be provided fixedly arranged on the amplifier housing. It is also pos ⁇ lich, the transmitting unit and the receiving unit in another already known component of a brake booster to integ ⁇ ing, provided that this component allows a Hineinragen the transmitting unit and the receiving unit in the vacuum chamber of the brake booster.
  • a vacuum connection, a pressure sensor, a differential pressure sensor, a vacuum check valve or other components for integration of the transmitting unit and the receiving unit can be used.
  • assembly operations can be considerably simplified, the number of necessary seals on the vacuum chamber can be reduced, tolerance specifications during installation can be reduced, and the integration capability of the sensor device according to the invention into different embodiments of brake booster can be simplified.
  • a transmitting unit can be combined with a receiving unit close to the transmitting unit and spatially configured substantially tightly or integratively combined, for example arranged coaxially about a vertical axis to the reflecting means.
  • Characterized duri ⁇ fen of the signal and the signal echo along the same axis, and the signal transition is perpendicular.
  • such a tightly combined transceiver unit can be arranged effectively on ei ⁇ ner side of a female pipe of a vacuum connection, which further simplifies installation and a redu ⁇ ed diameter of the inner nozzle and thereby a smaller breakthrough in a housing wall of the brake booster he ⁇ leaves.
  • a framed RGBge- aforementioned transmit-receive unit in a further component such as egg ⁇ NEN pressure sensor, a vacuum check valve or other component or device within the invention is possible.
  • a transmission unit may, however, be arranged also dissolved with a transmitting unit remote receiving unit spatially in a defined distance transverse to the plumb line, for example, radially relative to the inner nozzle ei ⁇ nes vacuum port.
  • the Sendeein ⁇ standardized may be arranged so that it emits the signal in an angle to the plumb line in the direction of reflecting surface, so that the reflected echo signal ⁇ at an angle to the reflected signal.
  • Such an arrangement is particularly suitable for detecting errors in the brake system, which can be determined by an unexpected position of the movable wall.
  • a combination of the two aforementioned combined and resolved arrangements of the sensor unit is also possible.
  • a vertical signal path can be picked up by the receiving unit near the transmitter unit and used further for determining the position, position or speed
  • an angular signal signal can be obtained from a receiving unit remote from the transmitter unit at defined distances of the movable wall can be registered and used, for example for Kalibri mecanicszwe ⁇ bridges, error checking the sendeechsnahen receiving unit, for easy detection of certain positions of the movable wall or other purposes.
  • a signal delay between a transmission of the signal and a reception of the signal echo for determining a position and / or a movement of the movable wall.
  • the position of the movable wall can be measured continuously over a total possible displacement range of the wall easily and effectively, for example when using a high-frequency Sig ⁇ Nals.
  • a high-frequency alternating magnetic field or high-frequency Ra ⁇ diowellen generated in a transponder sent in the direction of reflection means as a signal and received as a reflected signal echo, where it is further possible, the signal echo in a microchip in the RFID element to decode to subsequently forward it to an electronic control unit for further ⁇ use.
  • a change in a distance between the RFID element and the reflection means and thus the position of the movable wall can be detected by an RFID element on the basis of one of the above-described analysis options of the invention. be caught signal echoes such as time span, frequency change or intensity change or other criteria.
  • Fig.l a first embodiment of a pneumatic brake booster according to the invention.
  • FIG. 2 shows a detailed view of another embodiment of a pneumatic brake booster according to the invention.
  • a first embodiment of a erfindungsge ⁇ MAESSEN brake booster 1 is shown. Here has the
  • the booster housing 2 has several Fixed To ⁇ supply means 14 to the stationary mounting of the brake booster 1 in the vehicle, for example on a bulkhead as well as other fixing means 15 for fixing a not ge ⁇ showed the brake booster 1 downstream master brake cylinder to the booster housing. 2
  • the movable wall 3 is coupled to a control housing 16 and movable with this simultaneously. Further, the movable wall 3 by a rolling diaphragm 17, a sealing ring 18 and a poppet valve 19 against the booster housing 3 and the Steuergeophu ⁇ se 16 can be sealed, so that between the vacuum chamber 4 and the working chamber 5, a pneumatic differential pressure can arise.
  • the poppet valve 19 controls the differential pressure in the chambers 4, 5 by releasing or closing pneumatic connections between the chambers 4, 5 with each other and an ambient atmosphere.
  • a control of the poppet valve 19 is effected by a piston rod 20, which device can be coupled to an actuating ⁇ not shown, for example, a brake pedal. However, it can also be done by another device not shown in Fig.l, for example, an electromagnetically, electromechanically, electro-hydraulically or otherwise effective actuator device.
  • the control housing 16 cooperates with a push rod 21 by applying a pressure force 22 exerted by the differential pressure on the movable wall 3 along an actuating axis 23 in the push rod 21 and further into a downstream, not shown master brake cylinder for generating required brake pressure in the wheel brake circuits, not shown initiates.
  • a return spring 24 counteracts the pressure force 22 and ensures a return of the control housing 16 and thus also the movable wall 3 along the actuating axis 23 in a Starting position when the differential pressure is less than a spring force of the return spring 24.
  • Providing necessary negative pressure for the vacuum chamber 4 is usually realized by an external Un ⁇ tertikario not shown, for example, a suction pipe of an internal combustion engine or a separate vacuum pump.
  • the lower ⁇ pressure source can be connected to the vacuum chamber 4 via vacuum lines, not shown.
  • a vacuum connection 13 is provided for connecting a vacuum line to the vacuum chamber 4.
  • the vacuum connection 13 has an outer connection 25 for connection to the vacuum line, not shown, and an inner connection 26, which opens into the vacuum chamber 4 and guided by an elastic shape sealing ring 27 in an outer wall 28 of the booster housing 2 and sealingly fi ⁇ xed.
  • a separate shaped portions 28 of the Vakuuman ⁇ circuit 13 may be externally supported on mold members of the booster housing 2 and are thereby secured against rotation.
  • other mounting options of a vacuum port 13 are possible, for example with directionalele ⁇ elements, bayonet locks or separate guide elements.
  • the brake booster 1 is equipped with a contactless sensor device 6 for monitoring the position and movement of the movable wall 3.
  • the sensor device 6 includes fully a transmission unit 8, a receiving unit 9, a Reflection ⁇ onsstoff 10 and an electrical connector 30 for connecting electrical lines 31 for supplying power to the transmitting unit and receiving unit 8 and 9 for the transfer of electrical see signals to an electronic control unit 7.
  • the Refle ⁇ tion means is so designed that it wave-shaped Sig ⁇ nale, for example, electromagnetic waves or sound waves can reflect the law of reflection.
  • a separately arranged on the movable wall 3 Me ⁇ tallelement, a plastic or metallized Kunststoffele- ment, a suitable site may be provided directly on the movable wall 3, or another structural member as a reflection means 10, also are both flat and convex, concave, parabolic, round or otherwise designed transmitting and receiving unit-side surface of the reflection means 10 mög ⁇ lich.
  • the transmitting unit 8 sends a signal 11 with known self ⁇ properties, for example a known Signalausbreitungsge ⁇ speed or a known signal frequency along a plumb line 32 perpendicular to and 10 in the direction of Reflexionsmit ⁇ means of According to the law of reflection is the angle of incidence equals the angle of reflection is thus a signal echo 12 in the entge ⁇ genforceen direction also along the Lotachse 32 and subsequently registered by the receiving unit 9. In this case, a signal delay between the transmission of the signal 11 and the reception of the signal echo 12 is detected.
  • knowledge of the signal propagation velocity can therefrom to the decision ⁇ fernung to the reflection means 10 and thus closed to the movable wall 3 can be according to the principle:
  • the signals 11 are transmitted in a short defined time sequence one behind the other, can also be a movement, a comparison with the previously determined positions Speed and acceleration of the movable wall can be calculated.
  • a signal the reflected signal echo 12 is parallel to or instead of the above-described method 11 emitted with a known signal frequency in the direction of the reflection means 10, received found the Fre acid sequence of the signal echoes 12 and the two frequencies compared with each other hereinafter. Taking into account the Doppler effect is thereby determined whether the reflection ⁇ medium 10 and thus the movable wall 3 moves in the direction of or from the transmitting unit 8 or stops.
  • the receiving unit 9 is designed arranged sendeechsnah, so that the two A ⁇ units spatially substantially closely around the plumb line 32 summarized on one side of the inner nozzle 26 are arranged so that a perpendicular or substantially perpendicular signal path can be registered , It can just as a combined transceiver be designed with, for example, coaxially about the perpendicular axis 32 arranged transmitting unit 8 and receiving unit. 9
  • a transmission unit 8, a receiving unit 9 or egg ⁇ ne combined transmitting-receiving unit can be used as an RFID element be ⁇ leads.
  • the RFID element Radio Frequency Identification
  • the RFID element has a transponder, which generates a high frequency alternating field may ⁇ netic or high-frequency radio waves and transmits the signal 11 in the direction of reflecting means 10 degrees.
  • the magnetic alternating field or the radio waves are reflected by the Ref ⁇ lexionsstoff 10 as a signal echo 12, received by the RFID element and decoded by a microchip in the transponder.
  • the RFID element detects a change in a Abstan- of Y between the RFID element and the reflection means 10 and generates a signal which is forwarded to an electronic STEU ⁇ erritt 7 and processed therein.
  • an electronic control unit 33 is provided within the sensor device 6, which is operatively connected between the electronic control unit 7 on one side and the transmitting unit 8 or receiving unit 9 on the other side.
  • the control unit 33 can be used for converting control commands from the electronic control unit 7, for modulating the signal 11, for filtering and / or preprocessing the received signal echo 12, or for other purposes, without departing from the invention.
  • the control unit is arranged integrated in the same component, in which already the transmitting unit 8 and the receiving ⁇ unit 9 are arranged. In the embodiment shown, it is the vacuum connection 13, but of course also any other component provided for integrating the transmitting unit 8 and the receiving unit 9, also for integration can be used by the control unit 33, without departing from the invention.
  • control ⁇ unit 33 It is also possible within the invention to dispense with the control ⁇ unit 33, so that control of the transmitting unit 8 and the receiving unit 9 and the evaluation of the control unit 7 or another electronic component is taken.
  • a brake booster 1 in the vacuum chamber 4 protruding devices such as a vacuum check valve, a pressure sensor for Mes ⁇ sen pneumatic pressure in the vacuum chamber 4, or a differential pressure sensor for simultaneous measurement be provided by pneumatic pressures in the vacuum chamber 4 and working chamber 5 mounted on the booster housing 2.
  • the Sendeein ⁇ unit 8 with the receiving unit 9 can just as in those pre ⁇ called devices held in a vacuum port 13 are inte grated ⁇ provided without departing from the invention.
  • a transmission unit 8 and a receiving unit is also a separate, 9 comprehensive sensor unit with a ⁇ inde-ended connection to the booster housing and without a Kombina ⁇ tion with other functions within the invention are conceivable.
  • FIG. 2 In FIG. 2 is a detail view of a further execution ⁇ form of a brake booster 1 of the invention is shown.
  • the receiving unit 9 is spatially resolved away from the transmitting unit 8 and arranged at a defined distance X transversely to the perpendicular axis 32 on the inner connecting piece 26 of the vacuum connection 13.
  • the impact point A 32 shifts transversely to the plumb line by knowing a current position of the impact point A at the receiving unit 9, the current position of the reflecting surface and thus the distance Y can be calculated ,
  • a movement, a velocity and an acceleration of the movable wall can also be calculated on the basis of a comparison with the previously determined positions.
  • the receiving unit 9 such that only a single impact point A or a few defined impact points can be registered. This can be detected by a geometrically unique design specification dedicated positions of the movable wall 3.
  • Fig. 3 shows a cross section of the inner socket 26 of the Vakuuman ⁇ circuit of an embodiment of the invention with an integrated therein provided transmission unit 8 and a sendeechsnah and spatially closely adjacent the transmission unit 8 arranged receiving unit 9.
  • Fig.l between the signal 11 and the signal echo 12 an angular distance ⁇ ⁇ 0 ° and thus a largely vertical signal path.
  • FIG. 4 shows a further embodiment according to the invention of a narrow spatial arrangement, shown in FIG. 3, of transmitting unit 8 and receiving unit 9 for ensuring a lot signal signal.
  • the Emp ⁇ capturing unit 9 is radially outside coaxial to the transmitting unit 8 is arranged ⁇ provided.
  • Figure 5 shows a further embodiment according to the invention of a narrow spatial arrangement, shown in FIG. 3, of transmitting unit 8 and receiving unit 9 for ensuring a lot signal signal.
  • the Emp ⁇ capturing unit 9 is radially outside coaxial to the transmitting unit 8 is arranged ⁇ provided.
  • Figure 5 shows a further embodiment according to the invention of a narrow spatial arrangement, shown in FIG. 3, of transmitting unit 8 and receiving unit 9 for ensuring a lot signal signal.
  • FIG. 5 shows a further embodiment with a spatially resolved arrangement of transmitting unit 8 and receiving unit 9, wherein the receiving unit 9 remote transmitting unit and on the circumference of mecanicstut ⁇ zen 26 radially opposite the transmitting unit. 8 is arranged at a distance X to the latter.
  • ⁇ form other positions not shown may be conceivable as long as the characteristic distance X is suffi ⁇ ciently large enough to realize an angle ⁇ of Figure 2 substantially greater than 0 °, thereby enabling an angled beam path.
  • transmission unit 8 and receiving unit 9 does not remain limited to a vacuum port 13, but just as in a Drucksensornach the same principle, in a pressure sensor, a vacuum check valve, another component or can be installed in another separate housing.
  • the transmitting unit 8 and the receiving unit 9 are formed as RFID elements, so that the sensor device 6 operates according to the principle of operation described in Fig.l.

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

Abstract

L'invention concerne un servofrein pneumatique (1), en particulier pour systèmes de freinage de véhicules à moteur, comprenant un carter de servofrein (2) qui est subdivisé, par au moins une paroi (3) mobile axialement, qui est soumise à une pression différentielle pneumatique, en au moins une chambre à basse pression (4) et au moins une chambre de travail (5), et un dispositif capteur (6) pour le contrôle de la position et du déplacement de la paroi mobile (3), lequel fournit des signaux électriques à une unité de commande électronique (7). Afin de pouvoir contrôler de manière sûre, la position et le déplacement de la paroi mobile, ainsi que l'ensemble du parcours d'actionnement, et d'assurer un montage simplifié et une capacité d'intégration améliorée, l'invention est caractérisée en ce qu'il est prévu un dispositif capteur (6) qui dispose d'un moyen de réflexion (10), d'un émetteur (8) pour l'émission d'un signal en direction du moyen de réflexion (10), et d'un récepteur (9) pour la réception d'un signal d'écho (12).
PCT/EP2012/059866 2011-05-27 2012-05-25 Servofrein pneumatique présentant un dispositif capteur pour le contrôle, sans contact, de position et de déplacement d'une paroi mobile WO2012163844A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011076619 2011-05-27
DE102011076619.7 2011-05-27

Publications (1)

Publication Number Publication Date
WO2012163844A1 true WO2012163844A1 (fr) 2012-12-06

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PCT/EP2012/059866 WO2012163844A1 (fr) 2011-05-27 2012-05-25 Servofrein pneumatique présentant un dispositif capteur pour le contrôle, sans contact, de position et de déplacement d'une paroi mobile

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DE (1) DE102012208866A1 (fr)
WO (1) WO2012163844A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016224490A1 (de) 2016-12-08 2018-06-14 Continental Teves Ag & Co. Ohg Pneumatischer Bremskraftverstärker mit einem Abdichtelement
DE102016224715A1 (de) * 2016-12-12 2018-06-14 Continental Teves Ag & Co. Ohg Baukastenoptimierter pneumatischer Bremskraftverstärker
DE102016225210A1 (de) * 2016-12-15 2018-06-21 Continental Teves Ag & Co. Ohg Bremskraftverstärker mit einer baukastenoptimierten Gehäuseschale

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351933A1 (de) 2003-11-07 2005-06-23 Lucas Automotive Gmbh Unterdruckbremskraftverstärker mit einer Einrichtung zur Erzeugung eines eine Betätigung des Unterdruckbremskraftverstärkers anzeigenden elektrischen Signals
EP1635149A1 (fr) * 2004-09-02 2006-03-15 ROBERT BOSCH GmbH Système de détection optique d'une commande de freinage de véhicule
DE102008003609A1 (de) * 2007-01-12 2008-12-18 GM Global Technology Operations, Inc., Detroit Pedalwegprüfsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351933A1 (de) 2003-11-07 2005-06-23 Lucas Automotive Gmbh Unterdruckbremskraftverstärker mit einer Einrichtung zur Erzeugung eines eine Betätigung des Unterdruckbremskraftverstärkers anzeigenden elektrischen Signals
EP1635149A1 (fr) * 2004-09-02 2006-03-15 ROBERT BOSCH GmbH Système de détection optique d'une commande de freinage de véhicule
DE102008003609A1 (de) * 2007-01-12 2008-12-18 GM Global Technology Operations, Inc., Detroit Pedalwegprüfsystem

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