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WO1988002710A1 - Systeme de freinage anti-bloquant avec detection des defaillances et remontee de la pression - Google Patents

Systeme de freinage anti-bloquant avec detection des defaillances et remontee de la pression Download PDF

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Publication number
WO1988002710A1
WO1988002710A1 PCT/US1987/002439 US8702439W WO8802710A1 WO 1988002710 A1 WO1988002710 A1 WO 1988002710A1 US 8702439 W US8702439 W US 8702439W WO 8802710 A1 WO8802710 A1 WO 8802710A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
hydraulic
braking
response
valve
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
PCT/US1987/002439
Other languages
English (en)
Inventor
G. Emerson Brown
Richard T. Hendrickson
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.)
Honeywell International Inc
Original Assignee
Allied Corp
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 Allied Corp filed Critical Allied Corp
Publication of WO1988002710A1 publication Critical patent/WO1988002710A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator 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
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • 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
    • 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
    • B60T8/92—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 automatically taking corrective action
    • B60T8/94—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 automatically taking corrective action on a fluid pressure regulator

Definitions

  • the present invention relates to anti-lock braking systems and in particular to such a braking sys ⁇ tem which includes means for sensing and identifying specific failure modes and utilizing pressurized hydrau- lie fluid from a power booster to improve vehicle braking under specific failure conditions.
  • ABS Anti-lock braking systems are now well known.
  • the rotational behavior of the vehicles wheels is monitored during braking.
  • the ABS automatically interrupts operator control of the brakes and automatically modulates brake pressure applied to the vehicles wheel cylinders to provide maximum braking without skid or loss of control.
  • the braking system is powered by a closed center hydraulic booster which in ⁇ cludes a master cylinder having primary and secondary chambers and a power or booster section which includes a fluid reservoir and a control valve supplied with high pressure fluid from an accumulator and pump.
  • pressurized fluid is modulated to the boost ⁇ er chamber of the master cylinder. This pressure in turn applies pnwer assist pressure to the primary and second ⁇ ary pistons.
  • ABS operation Under ABS operation, the primary and sec ⁇ ondary pistons are isolated from the wheel cylinders and pressurized braking fluid is applied from the booster, pump, and accumulator to the wheel cylinders by an ABS control through the medium of modulating means which may comprise a plurality of solenoid actuated valves or multi ⁇ function valves such as disclosed in commonly assigned co-pending United States Patent Application Serial Nos. 789,203 and 789,202.
  • modulating means which may comprise a plurality of solenoid actuated valves or multi ⁇ function valves such as disclosed in commonly assigned co-pending United States Patent Application Serial Nos. 789,203 and 789,202.
  • the normally closed build valves of the ABS modulating means are energized upon the sensing of specific failures. These valves are connected directly to the boost pressure output of the hydraulic booster. This applies pressur ⁇ ized braking fluid to the normally closed isolation valve of the modulating means which, because of its physical structure, permits manually modulated pressurized braking fluid to pass therethrough to the wheel cylinder. This produces a system that.provides a flow of pressurized braking fluid to the wheel cylinders to maintain at least partial power boosted braking in the specific failure modes.
  • Yet another object of the invention is to pro- vide such a system in which normally closed build valves are energized on the sensing of specific failure modes to enable the application of a flow of pressurized braking fluid to the vehicle's brakes.
  • Still another object of the invention is to provide such an improved anti-lock braking system wherein energization of normally closed build valves upon sensing of specific failure modes will provide continued partial system performance and, in some cases, alleviation of the failure.
  • Figure 1 is a schematic diagram of the anti-lock braking system in accordance with the present invention.
  • Figure 2 is a simplified sectional drawing use ⁇ ful in explaining operation of the flow through valve arrangement. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 a functional block diagram of an adaptive braking system for use in a motor vehicle such as an automobile.
  • the system comprises a dual cylinder, hydraulically boosted displacement type master cylinder 10 having primary and secondary cylinders 12, 14, activated by pressurized fluid in booster chamber 16.
  • the pres ⁇ surized fluid in booster chamber 16 is modulated by means such as a foot pedal 18 and pressure control valve 20.
  • Pressurized fluid for the system is supplied from a motor driven pump 22 and accumulator 24 through hydraulic line 26. Fluid is provided to the pump 22 and master cylinder 10 from a fluid reservoir 28. Fluid passed through the system is returned to the reservoir by conduits such as 3 ⁇ -
  • Hydraulic fluid is also communicated from the reservoir 28 to cylinders 12, 14 through fluid lines 32, 34, and blocking valves 36, 38.
  • a primary hydraulic circuit is connected to cylinder 12 and includes a modu- lating valve means 50 connected to one or more wheel brake cylinders 52.
  • the modulating valve means de ⁇ scribed in more detail below, may comprise a plurality of solenoid actuated valves such as disclosed in co-pending United States Patent Application Serial No. 789,203, or by a multiple function device such as disclosed in co- pending United States Patent Application Serial- No. 789,202, both commonly assigned to the assignee of the present invention.
  • a secondary brake circuit II includes modulating valve means 56 connected to wheel brake cyl ⁇ inders 60.
  • the rotational behavior of the wheels is sensed via now well known magnetic sensing devices as at 58.
  • This information is applied to a micro-processor based ABS control 90 wherein signals generated by the sensors 50 indicative of the behavior of the wheels during braking is analyzed and control signals are gener- ated by ABS control 90.
  • a fluid level switch 60 operable by means such as a float disposed in the reser ⁇ voir 28 to sense the level of brake fluid in the reser ⁇ voir; a differential pressure switch 62 connected between primary master cylinder 12 and boost pressure chamber 16 to respond to a predetermined differential pressure there ⁇ between; a secondary differential pressure switch 64 con ⁇ nected between primary cylinder 12 and secondary cylinder 14; and a low pressure switch 66 responsive to a pre ⁇ determined " minimum output pressure from hydraulic pump 22 and accumulator 24.
  • the switches themselves may be of any form well known in the art and the outputs thereof are also applied to the ABS control 90 the connections not being shown in the drawings for clarity.
  • the control 90 is provided with appropriate software to monitor the operating state of the switches 60, 62, 64, and 66 and to generate appro- priate output signals at output terminals such as 94 in response to the logical combination of the possible operating states of the switches. Operation of this circuitry is more fully described in my co-pending United
  • Modulating means 50 comprises a valve body 52 which incorporates three valve assemblies 100, 102, and 104.
  • Valve assembly 100 is a three-way isolation valve, and assemblies 102, 104 are two-way, normally closed valves which effect control of build and decay of hydraulic pressure, respectively.
  • Assembly 100 includes an inlet port 106 normally in open communication with an outlet port 108 and fluidly connected to master cylinde Ir 10 and a wheel cylinder 60, respectively.
  • a valve element such as a ball valve 110 normally closes a valve seat 112 which communicates with fluid inlet and outlet ports 114, 116.
  • Valve element 110 can be operated by means such as a solenoid 118 to close inlet port 106 and provide fluid communication between inlet and outlet ports 114, 116, and wheel cylinder port 108.
  • the build valve assembly includes an inlet port
  • Decay valve assembly 104 includes an inlet port 128 and an outlet port 130 connected to the isolation valve assembly outlet port 116 and the reservoir 28, respectively.
  • Assembly 104 includes a ball valve element 132 normally closing communication between ports 128, 130 and operable in response to a solenoid 134 to open the valve and provide communication between the ports 128, 130. It will be seen that the valve assembly can provide the functions of isolation and control of build and decay of fluid pressure to a wheel cylinder in response to operation of solenoids 118, 126, and 134.
  • differential pressure switch 64 will operate in the event that there is a loss of pressure in the second ⁇ ary brake circuit supplied by cylinder 14 (this assumes that the fluid level switch 60 and low pressure switch 66 have not operated). This loss of pressure can be the result of a leak in the secondary brake circuit or due to the presence of gas in the secondary brake circuit.
  • differential pressure switches 62 and 64 will provide an indication of a loss of primary hydraulic circuit pressure, again due to a leak or the presence of gas in the primary braking circuit. Operation of differential pressure switch 62 alone (and again assuming that the low pressure switch 66 - or low fluid level switch 60 have not operated) will indi ⁇ cate the loss of pressure in both the primary and second ⁇ ary circuits due to leaks or the presence of gas.
  • the ABS control 90 in the event that a failure in the primary or secondary circuits should occur as indicated by operation of one, the other, or both of the differential pressure switches, the ABS control 90 will generate a control signal to energize the build valves of the modulating means 50 and/or 56. It will further be seen that the isolation valve, because of its physical configuration, will permit a flow of hydraulic fluid through the build valve and through- the isolation valve to the wheel cyl- inders even when the isolation valve is in its normal, non-operated state. Thus, this control function will effectively utilize the booster and its reserve source to apply pressurized brake fluid to the wheel cylinders.
  • the system will still provide powered secondary brakes. If the pressure failure is in the secondary system, powered primary braking will continue. In the event that both the front and rear systems have failed, the booster will continue to provide braking power to assist in stopping the ve ⁇ hicle until such time as the consumable supply of reserve braking fluid has been exhausted. In the event that the pressure failure is a result of gas in the system, it may be anticipated that much of the gas will simply be. elimi- nated from the system and normal operation ' of the braking system will be restored. Upon ultimate loss of fluid in the system, as a result of leaks, operation of the low pressure switch 66 or the low reservoir level switch 60 will occur. Under these circumstances, operation of the ABS will be terminated and the system will operate in a manual state only with manual braking being available in either the primary or secondary circuits -assuming that a dual failure has not occurred.

Landscapes

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

Abstract

Un système de freinage anti-bloquant comprend un ou plusieurs commutateurs (62, 64, 66) réagissant à la pression et destiné(s) à détecter la chute de pression hydraulique dans les circuits hydrauliques du système de freinage. Ledit système comprend également un circuit calculateur réagissant à la chute de pression de freinage dans les circuits électriques, afin d'exciter les soupapes (102) de remontée de la pression du système de freinage anti-bloquant. Les soupapes d'isolation (100) du système de freinage anti-bloquant réagissent à la chute de pression hydraulique et à l'excitation de la soupape (102) de remontée de la pression, afin d'appliquer une pression de suralimentation au circuit hydraulique défaillant.
PCT/US1987/002439 1986-10-14 1987-09-24 Systeme de freinage anti-bloquant avec detection des defaillances et remontee de la pression Ceased WO1988002710A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US91875086A 1986-10-14 1986-10-14
US918,750 1992-07-27

Publications (1)

Publication Number Publication Date
WO1988002710A1 true WO1988002710A1 (fr) 1988-04-21

Family

ID=25440899

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002439 Ceased WO1988002710A1 (fr) 1986-10-14 1987-09-24 Systeme de freinage anti-bloquant avec detection des defaillances et remontee de la pression

Country Status (3)

Country Link
AU (1) AU8102287A (fr)
ES (1) ES2005393A6 (fr)
WO (1) WO1988002710A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2789356A1 (fr) * 1999-01-14 2000-08-11 Bosch Braking Sys Corp Systeme de freinage
WO2004050447A1 (fr) * 2002-12-02 2004-06-17 Robert Bosch Corporation Servofrein electrohydraulique
CN115503673A (zh) * 2022-10-09 2022-12-23 岚图汽车科技有限公司 一种车辆制动偏软的处理方法、装置、设备及存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345860A1 (de) * 1970-09-23 1975-03-27 Teldix Gmbh Hydraulisches bremssystem
EP0082916A2 (fr) * 1981-12-24 1983-07-06 Robert Bosch Gmbh Antiskid arrangement
EP0111672A2 (fr) * 1982-11-20 1984-06-27 Robert Bosch Gmbh Système de freinage hydraulique de véhicule
GB2160273A (en) * 1984-06-14 1985-12-18 Teves Gmbh Alfred Failure protection in dual circuit anti-skid brake system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345860A1 (de) * 1970-09-23 1975-03-27 Teldix Gmbh Hydraulisches bremssystem
EP0082916A2 (fr) * 1981-12-24 1983-07-06 Robert Bosch Gmbh Antiskid arrangement
EP0111672A2 (fr) * 1982-11-20 1984-06-27 Robert Bosch Gmbh Système de freinage hydraulique de véhicule
GB2160273A (en) * 1984-06-14 1985-12-18 Teves Gmbh Alfred Failure protection in dual circuit anti-skid brake system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2789356A1 (fr) * 1999-01-14 2000-08-11 Bosch Braking Sys Corp Systeme de freinage
WO2004050447A1 (fr) * 2002-12-02 2004-06-17 Robert Bosch Corporation Servofrein electrohydraulique
CN115503673A (zh) * 2022-10-09 2022-12-23 岚图汽车科技有限公司 一种车辆制动偏软的处理方法、装置、设备及存储介质
CN115503673B (zh) * 2022-10-09 2025-02-14 岚图汽车科技有限公司 一种车辆制动偏软的处理方法、装置、设备及存储介质

Also Published As

Publication number Publication date
AU8102287A (en) 1988-05-06
ES2005393A6 (es) 1989-03-01

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