WO2000047971A1 - Procede et appareil permettant de detecter une fuite de liquide de frein - Google Patents

Procede et appareil permettant de detecter une fuite de liquide de frein Download PDF

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Publication number
WO2000047971A1
WO2000047971A1 PCT/US2000/002713 US0002713W WO0047971A1 WO 2000047971 A1 WO2000047971 A1 WO 2000047971A1 US 0002713 W US0002713 W US 0002713W WO 0047971 A1 WO0047971 A1 WO 0047971A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
vehicle
brake pedal
contact
vehicle brake
Prior art date
Application number
PCT/US2000/002713
Other languages
English (en)
Inventor
Douglas J. Duff
Original Assignee
Honda Of America Mfg., Inc.
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 Honda Of America Mfg., Inc. filed Critical Honda Of America Mfg., Inc.
Publication of WO2000047971A1 publication Critical patent/WO2000047971A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • 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
    • 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
    • B60T2270/406—Test-mode; Self-diagnosis

Definitions

  • This invention relates generally to apparatus for leakage testing fluid systems, and more particularly to an arrangement and method for testing vehicle hydraulic brake systems.
  • a purpose of this invention is the capability of providing an accurate and straightforward leakage determination which can be easily and reliably installed.
  • a vehicle brake leakage testing system can be easily mounted in association with and removed from the vehicle brake pedal .
  • the brake leakage testing system comprises a brake leak detector assembly having at least a brake contact, a spring means, an output means, and a reference end, typically opposite the brake contact.
  • the primary advantage provided by the present invention is to detect vehicle brake fluid leaks. Even an infinitesimal fluid loss can be detected at the factory, rather than after delivery to a customer. Furthermore, the brake leak detector is easy to install and can accurately determine if any brake fluid leaks are present on a vehicle in a matter of minutes .
  • Fig. 1 is a side view illustrating the vehicle brake leakage testing system in accordance with the present invention
  • Fig. 2 illustrates the vehicle brake leakage testing system of Fig. 1 in operation
  • Fig. 3 is a block diagram of the brake leak detector circuit for controlling the vehicle brake leakage testing- system of Figs. 1 and 2, and providing vehicle brake leakage indication.
  • a vehicle brake leakage testing system can be easily mounted in association with and removed from the vehicle brake pedal .
  • the brake leakage testing system comprises a brake leak detector assembly having at least a brake contact, a spring means, an output means, and a reference end, typically opposite the brake contact.
  • the reference end is located at any tangible reference location, such as in contact with the steering wheel of the vehicle.
  • the brake pedal of the vehicle is depressed so as to securely wedge the brake leak detector assembly between the brake pedal and the tangible reference location, and encourage the spring means to apply the necessary force for pressurizing the brake fluid.
  • the output means then indicates whether any leaks are detected in the brake fluid line.
  • Fig. 1 illustrates a brake leak detector assembly 10, in accordance with the present invention.
  • a brake contact 12 comprises a foot/brake pedal bracket.
  • the brake contact 12 is positioned so as to wedge the assembly 10 between the brake pedal 14 (at the brake contact 12 end) and a reference location (such as steering wheel 16) at reference end 18, as illustrated in Fig. 2.
  • a set screw 20 associated with a sliding collar 22 is loosened.
  • the operator then sits in the driver's seat of the vehicle and confirms that the steering wheel is straight and in the correct tilt position, before starting the vehicle.
  • the brake leak detector pedal plate 12 is then placed between the brake pedal 14 and the operators foot 24.
  • the operator confirms that the reference end 18 is properly positioned and the sliding collar 22 is correctly oriented.
  • the correct orientation for the sliding collar 22 requires the sliding collar to make contact with sensor 26, associated with circuit box 28, illustrated in more detail in Fig. 3.
  • the operator depresses the brake pedal 14 while pushing downward, into the brake pedal, on the assembly 10, facilitated by springs 42 and 44.
  • Chain 46 and associated swivel location 48 can be used to hold the device together when the unit is not installed. This securely positions the assembly 10 between the pedal 14 and the steering wheel 16 (or other reference location) .
  • the sliding collar 22 should abut circuit box 28, as sensed by contact 26 and indicated by contact indicator 30.
  • Circuit box 28 houses brake leak detector circuitry which is used to produce an indication of "pass" or "fail” for brake fluid in a vehicle.
  • an output light 32 is green to indicate an acceptable brake fluid system, and red to indicate an unacceptable brake fluid system, i.e., a fluid leak.
  • An audible signal, such as buzzer 34, can also be incorporated to give additional indication of failure mode.
  • circuitry to produce an indication of pass or fail for brake fluid, can be accomplished by a variety of suitable means and methods, such as, for example, an oscillator system.
  • timing means 52 such as an oscillator
  • This slow 1 minute pulse train goes into logic block 54, which comprises a serial to parallel converter having two functions. First, the converter is used as a counter until 5 pulse trains pass, which approximately represents 5 minutes and 30 seconds.
  • a serial-to-parallel converter also gives five outputs, shown as five timing lights 10, representing each minute of time. When a failure is detected, this is indicated by suitable means, such as a blocking transistor for blocking the timing clock pulse. This stops the timer and ensures the failed output stays activated. Since these five light outputs 36 can change incorrectly when failure occurs, a D-FF can be inserted as a timing light memory to help buffer switch spikes produced at the blocking transistor for the serial-to-parallel converter. This helps to prevent premature activation of the subsequent light, in light series 36, when a failure occurs .
  • the logic 58 of the circuit 50 uses two external inputs and one internal input .
  • the two external inputs to logic are the leak detection switch 26 and toggle switch 40, as seen in Fig. 3.
  • the internal input is the output of the serial-to-parallel converter after the 5 minute interval . This goes through a series of AND and INVERTER gates in block 54 to stop the timer 52 and keep the timing lights activated when failure occurs. The opposite is also true when a pass occurs, that is, a transistor of block 54 can be activated to block the detector switch 62 in case a detected failure happens after the 5 minutes is complete.
  • the visual reference of the test duration is indicated at block 58.
  • the second light 36 will come on after approximately 2 to 2 minutes; the third light 36 will come on after approximately 3 to 3 ⁇ minutes; the fourth light 36 will come on after approximately 4 to 4 ⁇ minutes; the fifth light 36 will come on after approximately 5 to 5 minutes; and the output light 32 will be green.
  • audible indicator 34 will sound, output light 32 will be red, the lights 36 will stop illuminating, and contact indicator 30 will be off. In this manner, brake fluid condition for a vehicle can be quickly and accurately tested for.

Landscapes

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

Abstract

La présente invention concerne un détecteur (10) de fuite de liquide de frein d'un véhicule, installé entre la pédale de frein d'un véhicule et un point de référence tel qu'un volant de direction. Ce détecteur permet de tester les systèmes de freins hydrauliques d'un véhicule et, plus particulièrement, de détecter les fuites de liquide de frein. Un contact frein (12) situé à une extrémité du détecteur est en contact avec la pédale de frein et, une extrémité de référence (18) située à une extrémité opposée du détecteur est en contact avec un emplacement de référence tangible quelconque, tel que le volant de direction. Des ressorts (42) sont associés au détecteur de façon à appliquer une force permettant de mettre le liquide de frein du véhicule sous pression lorsque le détecteur est en place. Une source de sortie (28) indique si des fuites de liquide de frein sont détectées.
PCT/US2000/002713 1999-02-11 2000-02-03 Procede et appareil permettant de detecter une fuite de liquide de frein WO2000047971A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24847499A 1999-02-11 1999-02-11
US09/248,474 1999-02-11

Publications (1)

Publication Number Publication Date
WO2000047971A1 true WO2000047971A1 (fr) 2000-08-17

Family

ID=22939300

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/002713 WO2000047971A1 (fr) 1999-02-11 2000-02-03 Procede et appareil permettant de detecter une fuite de liquide de frein

Country Status (1)

Country Link
WO (1) WO2000047971A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1691822A (en) * 1925-10-17 1928-11-13 Louis W Lindmeyer Pedal holder
US1760602A (en) * 1927-07-22 1930-05-27 Auto Brakeometer Corp Pressure-applying and indicating device for brake pedals
US4771387A (en) * 1986-07-18 1988-09-13 Dominion Tool & Die Co. Brake testing system for motor vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1691822A (en) * 1925-10-17 1928-11-13 Louis W Lindmeyer Pedal holder
US1760602A (en) * 1927-07-22 1930-05-27 Auto Brakeometer Corp Pressure-applying and indicating device for brake pedals
US4771387A (en) * 1986-07-18 1988-09-13 Dominion Tool & Die Co. Brake testing system for motor vehicles

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