CA1060511A - Fluid pressure actuated brake anti-lock control and method - Google Patents
Fluid pressure actuated brake anti-lock control and methodInfo
- Publication number
- CA1060511A CA1060511A CA278,734A CA278734A CA1060511A CA 1060511 A CA1060511 A CA 1060511A CA 278734 A CA278734 A CA 278734A CA 1060511 A CA1060511 A CA 1060511A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- fluid
- lock
- hydraulic fluid
- flow
- 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.)
- Expired
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
- B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
- B60T8/4208—Debooster systems
- B60T8/4225—Debooster systems having a fluid actuated expansion unit
-
- 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
- B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
- B60T8/4208—Debooster systems
- B60T8/4225—Debooster systems having a fluid actuated expansion unit
- B60T8/4233—Debooster systems having a fluid actuated expansion unit with brake pressure relief by introducing fluid pressure into the expansion unit
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Braking Arrangements (AREA)
Abstract
Abstract of the Disclosure A braking arrangement and method for a rotating member, and particularly for a wheeled automotive vehicle which has a motive means for driving the vehicle, in which a fluid pressure actuated brake is provided for slowing the rotating member and a sensor signals the occurrence of an excessive rate of retardation of the brake member.
Upon signalling of such an occurrence, pressurized hydraulic fluid circulating through a system which includes a pump driven by the vehicle motive means is blocked from flow from an actuating cylinder. Upon blocking flow of pressur-ized fluid from a cylinder through which the circulating fluid normally flows, a piston within the cylinder is moved to actuate an anti-lock device which operatively communicates with the fluid pressure actuated brake.
Upon signalling of such an occurrence, pressurized hydraulic fluid circulating through a system which includes a pump driven by the vehicle motive means is blocked from flow from an actuating cylinder. Upon blocking flow of pressur-ized fluid from a cylinder through which the circulating fluid normally flows, a piston within the cylinder is moved to actuate an anti-lock device which operatively communicates with the fluid pressure actuated brake.
Description
~`~
10605~
This invention relates generally to braking systems and more particularly to a ~luid pressure actuated brake anti-lock control apparatus and method of bra~ing a rotating member.
Prior recognition of the phenomenon known as "locking" '~
in the braking or slowing of a rotating member such as an automotive vehicle wheel has led to the development of anti-lock control devices or brake modulators. Typical approaches ;
to overcoming the problems of locking may be found in prior United States Patents No. Re 28,562 and 3,833,097. A related approach may be found in co-pending application Serial No.
246,015 filed February 18, 1976 and entitled "ANTI-LOCKING F :
BRAKE APPARATUS AND METHOD". Interested readers are referred ~ ~
to the description and illustration there o~ "one conduit ~ ;
systems" for brake anti-lock controls or modulators. To any extent necessary to understand this invention, the description there given are hereby incorporated by reference hereinto.
Persons skilled in the applicable arts relating to automotive vehicles and braking systems therefor are familiar with various power sources available on an automotive vehicle and possibly useful in connection ~ith control functions such as brake modulation. In part because of the availability of electrical power and in part due to development of other known electro-mechanical technology, the various anti-lock con-trollers or brake modulators specifically referred to herein-above have relied primarily upon electrically operated motive means in achieving the desired anti-lock control. While such reiiance upon electrical technology has achieved significant success, it is recognized that the demands placed upon the -- -electrical circuitry of an automotive vehicle may under certain adverse circumstances be quite great.
- 1 - ~ '.' '.
.. . . .. . .
s 106~511 In light of the related development dlscussed above, it is an object of the present invention to achieve anti-lock control over fluid pressure actuated brakes by reliance upon a circulating flow of pressurized fluid to power or provide j motive force for an anti-lock control or modulator. In realizing this object of the present invention, sole reliance upon the electrical system of an automotive vehicle is avoided and the possibility is opened of dealinq with substantially higher levels of force.
~ccordingly, there is provided in accordance with the present invention, in a wheeled automotive vehicle having motive means for driving the vehicle, a hydraulic fluid circuit including pump means driven by said motive means for circulat-ing pressurized fluid therethrough, fluid pressure actuated brake means for slowing a vehicle wheel, sensor means for signalling the occurrence of an excessive rate of retardation of the braked wheel, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, and anti-lock means interposed in said conduit and responsive to said sensor means for controllably interrupting and releasing the application of fluid pressure to said brake means, the improvement in said anti-lock means which comprises actuating means operatively communicating with said hydraulic fluid circuit for normal flow of circulating pressurized fluid there-through and for blocking flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braked wheel whereby motivating force for said anti-lock means is transmitted from said motive means through said hydraulic fluid circuit.
There is also provided in accordance with the present invention, in a method of braking a rotating member which `
- 1060511 ,;
includes applying pressurized brake fluid to a brake for a rotating member, signalling the occurrence of an excessive rate of retardation of the braked rotating member, and con-trollably interrupting and releasing the applled pressurized brake fluid in response to signalled occurrences of an excessive rate of retardation, the improvement comprising pumping a flow of hydraulic fluid, and controlling the inter~
rupting and releasing of brake fluid by controlling the pumped flow of hydraulic fluid in response to signalled occurrences.
The invention is illu-qtrated by way of example with reference to the accompanying drawings, in which: -Figure 1 is a partially perspective, partially ;
schematic, partially sectional view of an anti-locking device or modulator according to the present invention, incorporated ;-into a vehicle and shown in a normal or non-actuated condition;
Figure 2 is a view similar to a portion of Figure 1 and illustrating the device of Figure 1 in its actuated con-dition; and ;
Figure 3 is a view similar to Figure 2 and illu~trating an embodiment in which two devices are coupled together. ;
While the present invention will be described more fully hereinafter with reference to the accompanying drawings, it is to be understood at the outset of the detailed description of this invention that it is contemplated that various modifi-cations of the invention as described may be made by persons skilled in the appropriate arts. For that reason, the detailed description is to be read broadly, and not as limiting on the ;
scope of this invention.
Referring now more particularly to Figure 1, the present invention is contemplated as having particular utility B~
in conjunction with a wheeled automotive vehicle having motive . . .
..
.... . . . . . " . .. . . . . .
... , . . , . , ,, . . ... , .. ., ,.. ... ,....... .. . ~ . , ~ . . , ~ 1060511 means as generally indicated at 10 for driving the vehicle. As will be appreciated, the motive means 10 commonly is a petroleum fueled internal combustion engine. The vehicle additionally includes a hydraulic fluid circuit having a pump 11 which may be driven by the motive means 10 for circulating a pressurized fluid withdrawn from a reservoir 12. Persons familiar with the design and operation of conventional automotive vehicles will be aware that ~;uch pumps are commonly employed in conjunction with power assisted systems on an automotive vehicle such as 10 certain forms of power steering and power brakes and may be driven by means other than the vehicle engine. The vehicle additionally includes fluid pressure actuated brake means for slowing the rotating vehicle wheel membe~s and as generally !' indicated at 14. Pressurized brake fluid is conventionally ~ ;
supplied to such a brake 14 through a conduit 15 which operative-ly communicates with a master cylinder 16 or the like.
It has heretofore been proposed that an anti-lock control or brake modulator may be interposed in a supply conduit such as the conduit 15, for controllably blocking and relieving brake 20 pressure supplied therethrough. Such an anti-lock means, as will be described hereinafter, is conventionally controlled by .
a retardation sensor such as a sensor means 17 for signalling the occurrence of an excessive rate of retardation of a braked !,'~
rotating vehicle wheel member. Various forms of such sensors are known to persons skilled in the applicable arts and are ~-described in the aforementioned related patents and in co-pending ~' Blomberg Canadian application S.N. 246,018, to which the interested reader is referred. The sensor 17 in the arrange- $
ment according to the present invention may take any such known 30 form but is preferred to take a form which electrically signals such an occurrence by means of conductors 18. Certain such 106051~
sensors will be understood as signalling occurrences of wheel slip and are, for purposes of this description, deemed compar- :
able to sensors signalling excessive rates of retardation. :
An anti-lock means in accordance with the present invention is generally indicated at 19 and, in common with the anti-lock devices or brake modulators described in the afore-mentioned related patents, functions in response to the sensor means 17 for controllably interrupting and releasing the application of fluid pressure through the conduit 15 to the brake 14.
In accordance with the present invention, the anti-lock means 19 includes a housing 20 including a brake fluid passageway 21 in which is positioned a valve member 22 which is biased toward a seat 24 by a suitable spring 25. The valve member 22 is normally held in an unseated position by a pin 26 which extends from a fluid pressure piston means 28 which is thereby operatively coupled for actuating the valve member 22 to con-trollably interrupt the application of fluid pressure. As will .
be appreciated from Figure 1, pressurized brake fluid normally flows freely in both directions through the conduit 15 and 20 past the valve member 22 inasmuch as the member 22 is normally .
held in an unseated position by the piston means 28 and pin 26.
In accordance with the present invention, the hydraulic fluid circuit including the pump 11 and the reservoir 12 has at least a branch by means of which a circulating flow of fluid is passed through a cylinder means 29 which encloses at least a portion of the piston means 28. Interposed in the fluid circuit between the cylinder means 29 and the reservoir 12 and in the return flow path for fluid is a control valve member 30 30 which is biased toward a seat 31 by a spring 32. The control .
valve member 30 is noxmally maintained in an unseated position _ 5 _ ~ 106051~ '','. -by engage~ent th~rewith of a control pin 34 extending from an armature 35. The armature is biased toward the flow permitting p~sition by a spring 36.
As will be noted, a winding 38 which is electro-magnetically coupled with the armature 35 is electrically connected with the sensor conductors 18, 80 as to be energized in the event that an excessive rate of retardation of the braked rotating ~ -vehicle wheel member occurs. Upon energization of the winding 38, the armature 35 is shifted to permit seating of the control valve member 30, thereby blocking flow of pressurized fluid from the cylinder means 29. Upon the flow of fluid from the cylinder means 29 being blocked, the piston means 28 is moved against the force of a return spring 39 in such a direction as to permit seating of the anti-lock valve member 22 and enlargement of the volume communicating with the conduit 15 and brake 14 (see Figure 2). As a result, motivating force for the anti-lock means is supplied by the fluid circulating means including the pump 11 and reservoir 12.
Figure 3 illu~trate~ an embodiment using two anti-locking means according to the invention coupled in series one with the other by a connecting conduit 50. Elements of the arrange-ment of Figure 3 corresponding to elements shown in Figures 1 and 2 have been identified by similar reference characters of a one hundred ~eries for one anti-lock means (to the left in Fiqure 3) and of a two hundred series for the other. Such an embodiment is useful, for example, in connection with 80-called two circuit systems wherein a sensor may control both the circuits by the common solenoid valve. Such an embodiment can also be used in an anti-locking system utilizing a common sensor for two wheels, such as a so-called axle-by-axle system.
Persons skilled in the applicable arts of designing brake control systems for automotive vehicles will appreciate . , . ~', , . , . , . . - -~ - , : - 1 .. .. .
a variety of approaches which may be used to apply the present inventionO In perhaps the simplest form, as is illustrated in Figure 1, a single brake master cylinder and a single modulator may respond to a single sensor means operatively connected with one or more vehicle wheels. Somewhat more sophisticated -systems may employ plural modulators under the control of one or more sensors. By such arrangements, sensors may be provided for individual non-driven wheels and for paired driven wheels.
Further, sensors may be provided for individual driven wheels, with the sensors being paired for control of a modulator for the corresponding wheels. Other and further permutations of such arrangements will be brought to mind by these brief comments, such as arrangements in which all wheels are provided with wheel retardation sensors, the front and rear axles each having a modulator device. Yet another arrangement might provide an indivldual retardation sensor and modulator device for each of the rear wheels while the front wheels have a common wheel retardation sensor and modulator, using an arrangement such as that of Figure 3. Finally, each wheel may have its own wheel retardation sensor and its own modulator.
In the drawings and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and -descriptive sense only and not for purposes of limitation.
- . .
~ ,. i
10605~
This invention relates generally to braking systems and more particularly to a ~luid pressure actuated brake anti-lock control apparatus and method of bra~ing a rotating member.
Prior recognition of the phenomenon known as "locking" '~
in the braking or slowing of a rotating member such as an automotive vehicle wheel has led to the development of anti-lock control devices or brake modulators. Typical approaches ;
to overcoming the problems of locking may be found in prior United States Patents No. Re 28,562 and 3,833,097. A related approach may be found in co-pending application Serial No.
246,015 filed February 18, 1976 and entitled "ANTI-LOCKING F :
BRAKE APPARATUS AND METHOD". Interested readers are referred ~ ~
to the description and illustration there o~ "one conduit ~ ;
systems" for brake anti-lock controls or modulators. To any extent necessary to understand this invention, the description there given are hereby incorporated by reference hereinto.
Persons skilled in the applicable arts relating to automotive vehicles and braking systems therefor are familiar with various power sources available on an automotive vehicle and possibly useful in connection ~ith control functions such as brake modulation. In part because of the availability of electrical power and in part due to development of other known electro-mechanical technology, the various anti-lock con-trollers or brake modulators specifically referred to herein-above have relied primarily upon electrically operated motive means in achieving the desired anti-lock control. While such reiiance upon electrical technology has achieved significant success, it is recognized that the demands placed upon the -- -electrical circuitry of an automotive vehicle may under certain adverse circumstances be quite great.
- 1 - ~ '.' '.
.. . . .. . .
s 106~511 In light of the related development dlscussed above, it is an object of the present invention to achieve anti-lock control over fluid pressure actuated brakes by reliance upon a circulating flow of pressurized fluid to power or provide j motive force for an anti-lock control or modulator. In realizing this object of the present invention, sole reliance upon the electrical system of an automotive vehicle is avoided and the possibility is opened of dealinq with substantially higher levels of force.
~ccordingly, there is provided in accordance with the present invention, in a wheeled automotive vehicle having motive means for driving the vehicle, a hydraulic fluid circuit including pump means driven by said motive means for circulat-ing pressurized fluid therethrough, fluid pressure actuated brake means for slowing a vehicle wheel, sensor means for signalling the occurrence of an excessive rate of retardation of the braked wheel, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, and anti-lock means interposed in said conduit and responsive to said sensor means for controllably interrupting and releasing the application of fluid pressure to said brake means, the improvement in said anti-lock means which comprises actuating means operatively communicating with said hydraulic fluid circuit for normal flow of circulating pressurized fluid there-through and for blocking flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braked wheel whereby motivating force for said anti-lock means is transmitted from said motive means through said hydraulic fluid circuit.
There is also provided in accordance with the present invention, in a method of braking a rotating member which `
- 1060511 ,;
includes applying pressurized brake fluid to a brake for a rotating member, signalling the occurrence of an excessive rate of retardation of the braked rotating member, and con-trollably interrupting and releasing the applled pressurized brake fluid in response to signalled occurrences of an excessive rate of retardation, the improvement comprising pumping a flow of hydraulic fluid, and controlling the inter~
rupting and releasing of brake fluid by controlling the pumped flow of hydraulic fluid in response to signalled occurrences.
The invention is illu-qtrated by way of example with reference to the accompanying drawings, in which: -Figure 1 is a partially perspective, partially ;
schematic, partially sectional view of an anti-locking device or modulator according to the present invention, incorporated ;-into a vehicle and shown in a normal or non-actuated condition;
Figure 2 is a view similar to a portion of Figure 1 and illustrating the device of Figure 1 in its actuated con-dition; and ;
Figure 3 is a view similar to Figure 2 and illu~trating an embodiment in which two devices are coupled together. ;
While the present invention will be described more fully hereinafter with reference to the accompanying drawings, it is to be understood at the outset of the detailed description of this invention that it is contemplated that various modifi-cations of the invention as described may be made by persons skilled in the appropriate arts. For that reason, the detailed description is to be read broadly, and not as limiting on the ;
scope of this invention.
Referring now more particularly to Figure 1, the present invention is contemplated as having particular utility B~
in conjunction with a wheeled automotive vehicle having motive . . .
..
.... . . . . . " . .. . . . . .
... , . . , . , ,, . . ... , .. ., ,.. ... ,....... .. . ~ . , ~ . . , ~ 1060511 means as generally indicated at 10 for driving the vehicle. As will be appreciated, the motive means 10 commonly is a petroleum fueled internal combustion engine. The vehicle additionally includes a hydraulic fluid circuit having a pump 11 which may be driven by the motive means 10 for circulating a pressurized fluid withdrawn from a reservoir 12. Persons familiar with the design and operation of conventional automotive vehicles will be aware that ~;uch pumps are commonly employed in conjunction with power assisted systems on an automotive vehicle such as 10 certain forms of power steering and power brakes and may be driven by means other than the vehicle engine. The vehicle additionally includes fluid pressure actuated brake means for slowing the rotating vehicle wheel membe~s and as generally !' indicated at 14. Pressurized brake fluid is conventionally ~ ;
supplied to such a brake 14 through a conduit 15 which operative-ly communicates with a master cylinder 16 or the like.
It has heretofore been proposed that an anti-lock control or brake modulator may be interposed in a supply conduit such as the conduit 15, for controllably blocking and relieving brake 20 pressure supplied therethrough. Such an anti-lock means, as will be described hereinafter, is conventionally controlled by .
a retardation sensor such as a sensor means 17 for signalling the occurrence of an excessive rate of retardation of a braked !,'~
rotating vehicle wheel member. Various forms of such sensors are known to persons skilled in the applicable arts and are ~-described in the aforementioned related patents and in co-pending ~' Blomberg Canadian application S.N. 246,018, to which the interested reader is referred. The sensor 17 in the arrange- $
ment according to the present invention may take any such known 30 form but is preferred to take a form which electrically signals such an occurrence by means of conductors 18. Certain such 106051~
sensors will be understood as signalling occurrences of wheel slip and are, for purposes of this description, deemed compar- :
able to sensors signalling excessive rates of retardation. :
An anti-lock means in accordance with the present invention is generally indicated at 19 and, in common with the anti-lock devices or brake modulators described in the afore-mentioned related patents, functions in response to the sensor means 17 for controllably interrupting and releasing the application of fluid pressure through the conduit 15 to the brake 14.
In accordance with the present invention, the anti-lock means 19 includes a housing 20 including a brake fluid passageway 21 in which is positioned a valve member 22 which is biased toward a seat 24 by a suitable spring 25. The valve member 22 is normally held in an unseated position by a pin 26 which extends from a fluid pressure piston means 28 which is thereby operatively coupled for actuating the valve member 22 to con-trollably interrupt the application of fluid pressure. As will .
be appreciated from Figure 1, pressurized brake fluid normally flows freely in both directions through the conduit 15 and 20 past the valve member 22 inasmuch as the member 22 is normally .
held in an unseated position by the piston means 28 and pin 26.
In accordance with the present invention, the hydraulic fluid circuit including the pump 11 and the reservoir 12 has at least a branch by means of which a circulating flow of fluid is passed through a cylinder means 29 which encloses at least a portion of the piston means 28. Interposed in the fluid circuit between the cylinder means 29 and the reservoir 12 and in the return flow path for fluid is a control valve member 30 30 which is biased toward a seat 31 by a spring 32. The control .
valve member 30 is noxmally maintained in an unseated position _ 5 _ ~ 106051~ '','. -by engage~ent th~rewith of a control pin 34 extending from an armature 35. The armature is biased toward the flow permitting p~sition by a spring 36.
As will be noted, a winding 38 which is electro-magnetically coupled with the armature 35 is electrically connected with the sensor conductors 18, 80 as to be energized in the event that an excessive rate of retardation of the braked rotating ~ -vehicle wheel member occurs. Upon energization of the winding 38, the armature 35 is shifted to permit seating of the control valve member 30, thereby blocking flow of pressurized fluid from the cylinder means 29. Upon the flow of fluid from the cylinder means 29 being blocked, the piston means 28 is moved against the force of a return spring 39 in such a direction as to permit seating of the anti-lock valve member 22 and enlargement of the volume communicating with the conduit 15 and brake 14 (see Figure 2). As a result, motivating force for the anti-lock means is supplied by the fluid circulating means including the pump 11 and reservoir 12.
Figure 3 illu~trate~ an embodiment using two anti-locking means according to the invention coupled in series one with the other by a connecting conduit 50. Elements of the arrange-ment of Figure 3 corresponding to elements shown in Figures 1 and 2 have been identified by similar reference characters of a one hundred ~eries for one anti-lock means (to the left in Fiqure 3) and of a two hundred series for the other. Such an embodiment is useful, for example, in connection with 80-called two circuit systems wherein a sensor may control both the circuits by the common solenoid valve. Such an embodiment can also be used in an anti-locking system utilizing a common sensor for two wheels, such as a so-called axle-by-axle system.
Persons skilled in the applicable arts of designing brake control systems for automotive vehicles will appreciate . , . ~', , . , . , . . - -~ - , : - 1 .. .. .
a variety of approaches which may be used to apply the present inventionO In perhaps the simplest form, as is illustrated in Figure 1, a single brake master cylinder and a single modulator may respond to a single sensor means operatively connected with one or more vehicle wheels. Somewhat more sophisticated -systems may employ plural modulators under the control of one or more sensors. By such arrangements, sensors may be provided for individual non-driven wheels and for paired driven wheels.
Further, sensors may be provided for individual driven wheels, with the sensors being paired for control of a modulator for the corresponding wheels. Other and further permutations of such arrangements will be brought to mind by these brief comments, such as arrangements in which all wheels are provided with wheel retardation sensors, the front and rear axles each having a modulator device. Yet another arrangement might provide an indivldual retardation sensor and modulator device for each of the rear wheels while the front wheels have a common wheel retardation sensor and modulator, using an arrangement such as that of Figure 3. Finally, each wheel may have its own wheel retardation sensor and its own modulator.
In the drawings and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and -descriptive sense only and not for purposes of limitation.
- . .
~ ,. i
Claims (9)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a wheeled automotive vehicle having motive means for driving the vehicle, a hydraulic fluid circuit including pump means driven by said motive means for circulating .
pressurized fluid therethrough, fluid pressure actuated brake means for slowing a vehicle wheel, sensor means for signalling the occurrence of an excessive rate of retardation of the braked wheel, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, and anti-lock means interposed in said conduit and responsive to said sensor means for controllably interrupting and releasing the application of fluid pressure to said brake means, the improvement in said anti-lock means which comprises actuating means operatively communicating with said hydraulic fluid circuit for normal flow of circulating pressurized fluid therethrough and for stopping such flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braked wheel whereby motivating force for said anti-lock means is transmitted from said motive means through said hydraulic fluid circuit.
pressurized fluid therethrough, fluid pressure actuated brake means for slowing a vehicle wheel, sensor means for signalling the occurrence of an excessive rate of retardation of the braked wheel, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, and anti-lock means interposed in said conduit and responsive to said sensor means for controllably interrupting and releasing the application of fluid pressure to said brake means, the improvement in said anti-lock means which comprises actuating means operatively communicating with said hydraulic fluid circuit for normal flow of circulating pressurized fluid therethrough and for stopping such flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braked wheel whereby motivating force for said anti-lock means is transmitted from said motive means through said hydraulic fluid circuit.
2. A braking arrangement for a rotating member comprising fluid pressure actuated brake means for slowing the rotating member, sensor means for signalling the occurrence of an excessive rate of retardation of the braked rotating member, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, anti-lock means interposed in said conduit for controllably interrupting and releasing the application of fluid pressure to said brake means, fluid pressure piston means operatively coupled with said anti-lock means for actuating the same, fluid circulating means including means enclosing said piston means and accommo-dating flow of pressurized fluid therethrough, and control valve means responsive to said sensor means for stopping such fluid flow from said piston enclosing means upon a signalled occurrence of an excessive rate of retardation and so as to subject said piston means to fluid pressure for actuating said anti-lock means.
3. A braking arrangement according to Claim 2 wherein said sensor means comprises electrical switch means for elec-trically signalling occurrence of an excessive rate of retardation and further wherein said control valve means comprises electrical solenoid means electrically connected with and respon-sive to said switch means for actuating said control valve means.
4. A braking arrangement for a rotating member comprising fluid pressure actuated brake means for slowing the member, brake master cylinder means for supplying pressur-ized brake fluid to said brake means, brake conduit means for establishing operative communication between said brake means and said master cylinder means, anti-lock valve means interposed in said conduit means for controllably blocking the same and interrupting the supply of pressurized brake fluid to said brake means, anti-lock expansible chamber means interposed in said conduit means in series flow relation with said anti-lock valve means for controllably decreasing the pressure of pressurized brake fluid supplied to said brake means, fluid pressure piston means operatively connected with said anti-lock valve means and said anti-lock chamber means and movable between a first position in which said anti-lock valve means is maintained open and a second position in which said anti-lock valve means is closed and said anti-lock chamber means is expanded, hydraulic fluid circulating means for pumping a flow of hydraulic fluid, means defining a closed hydraulic fluid circuit operatively communicating with said circulating means for flow of hydraulic fluid therethrough and having cylinder means enclosing said piston means, sensor means for signalling the occurrence of an excessive rate of retardation of the wheel, and cylinder control valve means operatively responsive to said sensor means and interposed in said circuit downstream of said cylinder means for stopping such hydraulic fluid flow upon a signalled occurrence of an excessive rate of retardation, whereby hydraulic fluid in said cylinder means moves said piston means from said first position to said second position to interrupt and decrease the pressure of pressurized brake fluid supplied to said brake means.
5. In a braking arrangement for the wheel of an automotive vehicle including fluid pressure actuated brake means for slowing the wheel, brake master cylinder means for supplying pressurized brake fluid to the brake means, brake conduit means for establishing operative communication between the brake means and the master cylinder means, anti-lock means including valve means and expansible chamber means interposed in the conduit means for controllably decreasing and increasing the pressure of brake fluid applied to the brake means, sensor means for signalling the occurrence of an excessive rate of retardation of the wheel, and hydraulic fluid circulating means for pumping a flow of hydraulic fluid, the improvement comprising means defining a closed hydraulic fluid circuit operatively communicating with said circulating means for flow of hydraulic fluid therethrough, control valve means interposed in said circuit and responsive to said sensor means for stopping such flow of hydraulic fluid through said circuit upon occurrence of an excessive rate of retardation of the wheel, and anti-lock actuating means interposed in said circuit and responsive to blockage of flow of hydraulic fluid.
therethrough for actuating said anti-lock means in response to said control valve means.
therethrough for actuating said anti-lock means in response to said control valve means.
6. In a method of braking a rotating member which includes applying pressurized brake fluid to a brake for a rotating member, signalling the occurrence of an excessive rate of retardation of the braked rotating member, and controllably interrupting and releasing the applied pressurized brake fluid in response to signalled occurrences of an excessive rate of retardation, the improvement comprising pumping a flow of hydrau-lic fluid, and stopping the interrupting and releasing of brake fluid by controlling the pumped flow of hydraulic fluid in response to signalled occurrences.
7. A method according to Claim 6 wherein the step of pumping a flow of hydraulic fluid comprises circulating hydraulic fluid through a closed hydraulic fluid circuit, and the step of stopping the pumped flow of hydraulic fluid comprises closing a valve in the closed circuit and energizing-an anti-lock device with increased hydraulic fluid pressure in the closed circuit upstream of the valve.
8. A method according to Claim 7 wherein the step of circulating hydraulic fluid comprises directing a continuing flow of hydraulic fluid through a cylinder upstream of the valve and through the valve, and wherein the step of energizing an anti-lock device comprises exerting increased hydraulic fluid pressure on a piston movable within the cylinder from a first position in which the anti-lock device maintains normal braking action and a second position in which the anti-lock device interrupts and releases braking action, and moving the piston to the second position.
9. A braking arrangement for a rotating member comprising fluid pressure actuated brake means for slowing the rotating member, sensor means for signalling the occurrence of an excessive rate of retardation of the braked rotating member, a conduit operatively communicating with said brake means for applying thereto fluid under pressure, and anti-lock means interposed in said conduit for controllably interrupting and releasing the application of fluid pressure to said brake means;
said anti-lock means comprising actuating means operatively communicating with said hydraulic fluid conduit for normal flow of circulating pressurized fluid therethrough and for stopping such flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braking rotating member whereby a motivating force for said anti-lock means is transmitted through said hydraulic fluid conduit.
said anti-lock means comprising actuating means operatively communicating with said hydraulic fluid conduit for normal flow of circulating pressurized fluid therethrough and for stopping such flow of pressurized fluid upon a signalled occurrence of an excessive rate of retardation of the braking rotating member whereby a motivating force for said anti-lock means is transmitted through said hydraulic fluid conduit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7605862A SE418598B (en) | 1976-05-24 | 1976-05-24 | ANTILAS DEVICE OF HYDRAULIC BRAKE SYSTEM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1060511A true CA1060511A (en) | 1979-08-14 |
Family
ID=20327981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA278,734A Expired CA1060511A (en) | 1976-05-24 | 1977-05-18 | Fluid pressure actuated brake anti-lock control and method |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS52148780A (en) |
| AR (1) | AR221473A1 (en) |
| AU (1) | AU516825B2 (en) |
| BE (1) | BE854933A (en) |
| BR (1) | BR7703304A (en) |
| CA (1) | CA1060511A (en) |
| CS (1) | CS235061B2 (en) |
| DE (1) | DE2723399A1 (en) |
| ES (1) | ES459064A1 (en) |
| FR (1) | FR2352696A1 (en) |
| GB (1) | GB1579162A (en) |
| IT (1) | IT1082094B (en) |
| MX (1) | MX144187A (en) |
| NL (1) | NL7705195A (en) |
| PL (1) | PL116032B1 (en) |
| PT (1) | PT66578B (en) |
| SE (1) | SE418598B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2380552A1 (en) * | 1977-02-09 | 1978-09-08 | Electro Nite | Sampling nodular or vermicular cast iron - by cooling curve or emission spectrometry after addn. of tellurium and a magnesium and/or cerium binding agent |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US28562A (en) | 1860-06-05 | Machine for | ||
| US3610702A (en) * | 1969-06-10 | 1971-10-05 | Bendix Corp | Adaptive braking system with hydraulically powered modulator |
| DE2142552C2 (en) * | 1971-08-25 | 1984-06-07 | Alfred Teves Gmbh, 6000 Frankfurt | Pressure control valve for an anti-lock control system |
| GB1440065A (en) * | 1972-09-26 | 1976-06-23 | Girling Ltd | Actuator assemblies for vehicle brakes |
| JPS5528898B2 (en) * | 1972-07-25 | 1980-07-31 | ||
| US3801160A (en) * | 1972-11-24 | 1974-04-02 | Bendix Corp | Hydraulic pressure modulator |
| GB1426508A (en) * | 1973-05-31 | 1976-03-03 | Nissan Motor | Vehicle skid control system including vehicle speed sensor |
| US3833097A (en) * | 1973-09-26 | 1974-09-03 | Holst Jan Olof Martin | Anti-locking arrangement for fluid pressure actuated brake |
-
1976
- 1976-05-24 SE SE7605862A patent/SE418598B/en not_active IP Right Cessation
-
1977
- 1977-05-10 AU AU25056/77A patent/AU516825B2/en not_active Expired
- 1977-05-11 NL NL7705195A patent/NL7705195A/en not_active Application Discontinuation
- 1977-05-18 CA CA278,734A patent/CA1060511A/en not_active Expired
- 1977-05-19 PT PT6657877A patent/PT66578B/en unknown
- 1977-05-19 CS CS329377A patent/CS235061B2/en unknown
- 1977-05-20 PL PL19825977A patent/PL116032B1/en unknown
- 1977-05-23 BR BR7703304A patent/BR7703304A/en unknown
- 1977-05-23 FR FR7715631A patent/FR2352696A1/en active Granted
- 1977-05-23 BE BE6046018A patent/BE854933A/en not_active IP Right Cessation
- 1977-05-23 AR AR26774977A patent/AR221473A1/en active
- 1977-05-23 GB GB2171377A patent/GB1579162A/en not_active Expired
- 1977-05-24 DE DE19772723399 patent/DE2723399A1/en not_active Withdrawn
- 1977-05-24 IT IT2394877A patent/IT1082094B/en active
- 1977-05-24 ES ES459064A patent/ES459064A1/en not_active Expired
- 1977-05-24 JP JP6035877A patent/JPS52148780A/en active Pending
- 1977-05-30 MX MX16923577A patent/MX144187A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AR221473A1 (en) | 1981-02-13 |
| PT66578B (en) | 1978-10-20 |
| JPS52148780A (en) | 1977-12-10 |
| PL198259A1 (en) | 1978-01-16 |
| DE2723399A1 (en) | 1977-12-08 |
| PT66578A (en) | 1977-06-01 |
| PL116032B1 (en) | 1981-05-30 |
| CS235061B2 (en) | 1985-04-16 |
| FR2352696B1 (en) | 1981-10-23 |
| NL7705195A (en) | 1977-11-28 |
| BR7703304A (en) | 1978-03-14 |
| SE418598B (en) | 1981-06-15 |
| ES459064A1 (en) | 1978-04-16 |
| GB1579162A (en) | 1980-11-12 |
| BE854933A (en) | 1977-11-23 |
| SE7605862L (en) | 1977-11-25 |
| AU516825B2 (en) | 1981-06-25 |
| AU2505677A (en) | 1978-11-16 |
| MX144187A (en) | 1981-09-09 |
| FR2352696A1 (en) | 1977-12-23 |
| IT1082094B (en) | 1985-05-21 |
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