AU7250700A - Microprocessor controlled pneumatically driven valve system - Google Patents
Microprocessor controlled pneumatically driven valve system Download PDFInfo
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- AU7250700A AU7250700A AU72507/00A AU7250700A AU7250700A AU 7250700 A AU7250700 A AU 7250700A AU 72507/00 A AU72507/00 A AU 72507/00A AU 7250700 A AU7250700 A AU 7250700A AU 7250700 A AU7250700 A AU 7250700A
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Description
P/00/011 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD DIVISIONAL PATENT Invention Title: Microprocessor controlled pneumatically driven valve system The following statement is a full description of this invention, including the best method of performing it known to us: FHPSYrCp\NATP(W120W\InI75m1s CQ00374722.1 Microprocessor controlled pneumatically driven valve system This application is a divisional application of U.S.
Application Serial No. 08/815,422, filed March 11, 1997, now issued as U.S. Patent 5,941,280 on 24 August 1999.
Field of the invention The present invention relates, in general to a microprocessor controlled pneumatically driven valve system.
Cross Reference to related applications The invention taught in this patent application is closely related to each of the inventions taught in U.S. Patent 5,564,794, titled: "A TRAIN BRAKE PIPE PRESSURE EXHAUST CONTROL o SYSTEM AND REGULATING VALVE THEREFORE", which issued on October 15, 1996. That U.S. patent is assigned to the assignee of the 15 present invention, and its teachings are incorporated by reference into this document.
•ego eoeo Background of the invention There is currently an ongoing engineering effort, by suppliers of railway braking equipment, to develop an electro- 20 pneumatic type brake system for railroad freight trains. It is generally acknowledged in the railroad industry that the °.e development of such an electro-pneumatic brake control will substantially enhance the operation of a train by achieving a faster brake response, more equalized car retardation and a generally more uniform braking effort throughout a long train of cars.
These enhanced results are based on the assumption that all of the cars, or at least a majority of the cars, making up a train will be appropriately equipped for utilizing such improved electropneumatic braking system, in which case direct control of the brake cylinder air pressure is envisioned. With the possible exception of certain unit trains, however, it currently cannot be reasonably expected that any such majority of cars will be immediately implemented with the required electro-pneumatic brake equipment.
ooeo Accordingly, for the present, indirect brake cylinder air o.
pressure control is contemplated, in which the train brake pipe air pressure is controlled not only at the locomotive, but also at one 5 or several remote cars located throughout the train to accelerate the reduction of brake pipe air pressure in order to achieve a faster and more uniform brake response.
o When the brake pipe pressure is reduced at any given point S along the brake pipe, however, a transient low pressure is created .20 in the vicinity of that point. Consequently, if the exhaust Screating the transient low pressure is closed too quickly, i.e., before the entire length of the brake pipe pressure is stabilized, air will flow towards the low pressure point thereby causing a localized increase in pressure at that point which can cause control valves in that vicinity to inadvertently release.
On the other hand, if the exhaust is closed too slowly, the pressure will be reduced to a level below the desired target pressure. Therefore, anytime the air pressure is reduced at any one or more remote locations along the brake pipe, it is vitally necessary that a flow equilibrium be established and maintained thereat following reduction of the brake pipe pressure to- a.
commanded target value. This then requires that an exhaust flow be carefully controlled to continuously match the changing flow of air from the rest of the brake pipe to the exhaust location.
At the present time, most railway freight trains are required to utilize an end-of-train unit disposed on the last car in the train. Such an end-of-train unit, among other highly critical functions, may be equipped to independently and remotely initiate a reduction of the brake pipe air pressure from the rear of the 5 train in response to the train operator's activation of a special triggering device located in the cab of the locomotive. This may be accomplished, for example, by the operator transmitting a brake application command signal from the locomotive to the end-of-train unit via radio communication.
20 One approach to effecting such an air pressure reduction in the brake pipe has been to utilize a control valve which includes a variable type orifice through which the brake pipe air pressure is discharged. Normally, in these self-regulating type valves, either a spring setting against a pressurized area or a reference control pressure is utilized to effectively control the variable orifice.
CE00374722.1 In contrast thereto, nonself-regulating type valves require the use of a microprocessor to constantly monitor the brake pipe pressure to obtain pressure feedback information in order to establish an appropriate valve orifice size in response to a changing difference between the commanded target pressure and the feedback pressure. The above referenced U.S. Patent teaches one such nonself-regulating valve system utilising a valve body having a single annular valve seat encircling a conical protrusion, through which the brake pipe pressure is exhausted for both service and emergency brake applications.
Summary of the Invention In one aspect the present invention provides a *microprocessor controlled regulating valve system for use in an end-of-train unit disposed on a railway car at a location in a S 15 train remote from a locomotive, said microprocessor controlled regulating valve system comprising: a microprocessor unit disposed in said end-of-train unit e and equipped to receive a brake command signal transmitted from such locomotive; 20 a first pressure transducer connected to a brake pipe e o disposed on such railway car for determining brake pipe air pressure and connected for transmitting a first electrical signal to said microprocessor unit representative of such brake pipe air pressure; a regulating valve device disposed in said end-of-train and connected to receive air pressure from said brake pipe and to exhaust air pressure therefrom at a first service rate and at a second emergency rate; and CE00374722.1 an electro pneumatic control means connected to receive air pressure from such brake pipe and electrical control signals from said microprocessor unit for communicating control pressure to said regulating valve device in response to said electrical control signals received from said microprocessor unit.
According to another embodiment, this invention provides a microprocessor controlled regulating valve device for use in an end-of-train unit disposed on a railway car at a location in a train remote from a locomotive. Such microprocessor controlled regulating valve device includes a microprocessor unit disposed in the end-of-train unit and is equipped to receive a brake command signal transmitted from such locomotive. A first pressure transducer is connected to a brake pipe disposed on such railway car for determining brake pipe air pressure and is 15 connected for transmitting an electrical signal to such microprocessor unit representative of such brake pipe air pressure. There is a regulating valve disposed in such end-oftrain unit that is connected to receive air pressure from such eeoc brake pipe and to exhaust air pressure therefrom at a first service rate and at a second emergency rate. Additionally, an S" electro pneumatic control means is connected to receive air pressure from such brake pipe and electrical signals from the microprocessor unit for communicating control air pressure to such regulating valve in response to electrical signals received from such microprocessor unit.
CE00374722.1 Objects of the Invention Various objects and advantages of the microprocessor controlled regulating valve system will become more readily apparent to those persons who are skilled in the relevant railway braking art from the following much more detailed description of the invention, particularly, when such detailed description is taken in conjunction with the attached drawing Figures and the appended claims.
Brief Description of the Drawings Figure 1 is a schematic illustration of a railroad train having a plurality of freight cars headed by a locomotive which is in radio communication with an end-of-train unit disposed on o the last car of the train; 1 5 Figure 2 is a block diagram of a microprocessor based indirect brake cylinder air pressure control system adapted for end-of-train service as can be utilised in conjunction with the presently preferred embodiment of the pneumatic controlled valve device of the invention; and 20 Figure 3 is a diagrammatic, cross-sectional view showing a presently preferred embodiment of the pneumatic controlled valve device of this invention for carrying out service and emergency CE00374722,1 reduction of brake pipe air pressure in accordance with the indirect brake cylinder pressure control system illustrated in Figure 2.
BRIEF DESCRIPTION OF A PRESENTLY PREFERRED AND VARIOUS ALTERNATIVE EMBODIMENTS OF THE PRESENT INVENTION Prior to proceeding to the more detailed description of the present invention, it should be noted that, for the sake of clarity and a fuller understanding of such invention, identical components which have identical functions have been identified with identical reference numerals and/or symbols throughout the several views illustrated in the attached drawings.
As best shown in Figure 1, railroad cars CN which make up a train are physically coupled to a locomotive L by typical prior art type car couplers (not shown) and are further coupled pneumatically by a brake pipe BP that extends continuously from the locomotive L to the last=-car CL in the train. Associated with the last car is an end-of-train unit EOT that is coupled to the locomotive L via radio communication.
The last car CL of the train is further provided with a brake control valve device CV, as are all of the other cars These brake control valve devices CV are, preferably, an A.A.R. standard AB type control valve, such as an ABD, ABDW or ABDX control valve.
Each of these standard AB type control valves is presently being manufactured by Westinghouse Air Brake Co. As is well known, these car control valve devices CV operate to control the car brakes in CE00374722.1' response to variations of the train brake pipe air pressure at the respective cars.
Reference is now made to Figure 2. Illustrated therein is an end-of-train unit EOT which includes a microprocessor unit MPU.
This microprocessor unit MPU, at relatively frequent intervals, monitors the existing brake pipe pressure in brake pipe BP. Such monitoring of the brake pipe pressure is achieved by a first pressure transducer T1 which will transmit a signal to such microprocessor unit MPU that is representative of the brake pipe pressure in brake pipe BP.
The microprocessor unit MPU is programmed to compare the existing brake pipe pressure as represented by the signal from the pressure transducer T1 to a given target pressure. This given target pressure is supplied to the microprocessor unit MPU as an input signal 9 transmitted via radio transmission from the locomotive-for either a controlled brake pipe air pressure reduction for making a service brake application or a quick and substantial brake pipe air pressure reduction for making an emergency brake application.
In addition, a second pressure transducer T2 monitors the air pressure in the stability reservoir SR and transmits a signal to the microprocessor unit MPU that is representative of--this pressure. In response to these signals, the microprocessor unit MPU in turn selectively operates an exhaust solenoid valve EV and/or a supply solenoid valve SV, to which the brake pipe BP is
C
C CE00374722.1 connected by'a branch pipe 10 and accordingly operates brake pipe air pressure regulating valve device RV.
Exhaust solenoid valve EV and supply solenoid valve SV are normally closed, solenoid operated, spring returned valves, as are common in such equipment. Pursuant to such operation, the microprocessor unit MPU, either opens supply solenoid valve SV.to admit pressurized air to a stability reservoir SR, or opens exhaust solenoid valve EV to vent pressurized air from stability reservoir SR. The controlled pressure within stability reservoir SR is responsible for operation of pneumatic drive 15 on pressure regulating valve device RV, and accordingly the essential operation of regulating valve device RV, as necessary to either controllably open a service valve 20 or an emergency valve 22, as described below.
oe **oo 9*
S
S
Each car including the last car has its control valve CV connected to such brake pipe BP via branch pipe 12. Control valve CV on each car is associated with an auxiliary reservoir AR and an emergency reservoir ER that are charged via such brake pipe BP and provide a source of compressed air for operating the car's brake cylinder device BC in response to service and emergency rates of reduction in the brake pipe air pressure.
Control valve device CV, connected to brake pipe BP via branch pipe 12, operates in response to increasing brake pipe air pressure to charge the auxiliary reservoir AR and the emergency reservoir ER to the operating pressure of brake pipe BP, while concurrently venting the car's brake cylinder device BC. Such operation is CE00374722.1' p p. p p p p..
well-known to those skilled in the art, being known as "release and charging", and thus requires no further explanation.
In accordance with the embodiment illustrated in Figure 3, the valve device RV of this invention comprises a valve housing 30 with an elongated valve stem 32. Such elongated valve stem 32 is reciprocally disposed within an elongated bore 34 that is centrally disposed within valve housing A primary supply passage 36 extends from an upper portion of such elongated bore 34, namely receiving chamber 40, to which the brake pipe BP is connected via primary supply pipe 38.
Accordingly, the receiving chamber 40 is. normally charged with compressed air at brake pipe pressure. Branch supply passage 42 extends from the primary supply passage 36 to similarly maintain the emergency chamber 44 charged with compressed air at brake pipe pressure.
In no-mal operation, with control volume 66 vented consistent with the absence of either a service or an emergency brake application, such service valve 20 and the emergency valve 22 are each in a closed position, thereby allowing the pressure within chambers 40 and 44 to be maintained in accordance with the operating pressure in the brake pipe BP.
With further regard to elongated valve stem 32, a :small cylindrical upper end 50 thereof extends upwardly from the service valve 20 within the receiving chamber 40. Chamber 40 forms a part of the elongated bore 34 and serves as the terminus of such primary supply passage 36. Service valve 20 is disposed immediately below p p p p 9* C PP CE00374722.1 receiving chamber 40 and is adapted to vent brake pipe air pressure from such receiving chamber 40 for the purpose of making a service brake application.
As can be seen, the service valve 20 comprises a male conical valve head portion 70 circumferentially disposed on such elongated valve stem 32 and is adapted to seat within a female conical valve seat 72 which forms a part of the bore 34. There is an 0-ring type seal 74 provided on the conical valve head portion 70 to prevent escape of brake pressure from the receiving chamber 40 when the control valve 20 is intended to be closed. An exit chamber 76 is provided below service valve 20 into which conical valve head oooo recedes when such service valve 20 is opened and which is in fluid communication with exhaust passage 78.
O e *Accordingly, when service valve 20 is even partially opened, air pressure within such receiving chamber 40 will pass into the 0*O**e exit chamiber 76 and further pass to the atmosphere via such exhaust passage 78.
With regard to service valve 20, it can be seen that a cylindrical portion 46 of the valve stem 32 is disposed at the apex S: of the male conical valve head 70, which is reciprocally disposed *o o within a cylindrical port 48. The clearance between such cylindrical portion 46 and the cylindrical port 48 is restricted so that the venting of brake pipe air pressure therethrough is also restricted and slowed to thereby permit a rather exacting control of brake pipe air pressure venting through such service valve as is normally necessary for making a service brake application.
CE00374722:1 A reciprocal piston element 80, forming a part of elongated valve stem 32, is provided below the exhaust passage 78. Such piston element 80 is adapted for reciprocal motion within cylinder port 82 which forms a part of bore 34. Here again, there is an O-ring seal 84, preferably, provided on such piston element 80 to prevent escape of brake pipe air pressure from the emergency exhaust chamber 44 which is disposed below cylinder port 82. There is a compression spring 86 compressively disposed between the under-side of such piston element 80 and the base of bore 34, which serves to bias the valve stem 32 upward.
The combination of the piston element 80, the cylindrical oooo port 82 and the emergency exhaust chamber 44 all serve to form a second valve, namely the emergency valve 22, which is opened when such piston element 80 moves downwardly sufficient to clear the :°oooo lower edge of such cylinder port 82 to thereby expose the exhaust chamber 44=to both the chamber 76 and the exhaust passage 78.
The pneumatic drive 15 is incorporated into the upper portion of such valve housing 30 and comprises a diaphragm operated piston member 60 that is operatively disposed for reciprocal motion within a guide bore 62. The diaphragm 64 separates the control chaminber 66 on the upper side from the atmospheric chamber 52 on the lower side. This control chamber 66 is connected to a control passage 68 to admit control pressure from the stability reservoir SR via control supply pipe 56 while the atmospheric chamber 52 is vented to atmosphere via outlet 54.
CE00374722.1 0* a.
The base of piston member 60 is disposed to directly engage the cylindrical push stem 50 at the upper end of valve stem 32, so that any downward motion of such piston member 60, resulting from an increase in control pressure within control chamber 66, will cause the valve stem 32 to be moved downward within such bore 34.
Compression spring 58 is disposed between the head portion on the piston member 60 and a horizontal portion of housing 30 to bias such piston member 60 upwardly when the pressures in such control chamber 66 and such atmospheric chamber 52 are equal, thereby assuring that valves 20 and 22 are closed.
As should be readily apparent, just a small minor downward movement of such valve stem 32 will normally be sufficient to open the valve 20, but a significant major downward movement would be required to open the valve 22.
Pursuant to normal operation, the brake pipe BP will be charged to--the train operating air pressure by movement of the locomotive brake valve handle (not shown) to a release position in a manner well-know in the railroad industry. The branch pipe 12 conducts compressed air from such brake pipe BP to each control device CV disposed on each car C, thereby charging each auxiliary reservoir AR and each emergency reservoir ER and exhausting any compressed air in each brake cylinder BC.
Concurrently with the charging of the brake pipe BP, a corresponding radio signal is transmitted to the EOT unit at the last car Microprocessor MPU operates in response to this radio signal to close the supply solenoid valve SV and to open solenoid CE00374722.1 exhaust valve EV in order to maintain atmospheric pressure within such stability reservoir SR. With atmospheric pressure within stability reservoir SR, such- pressure will also be maintained within such control chamber 66 which will equalize the pressures in both the control chamber 66 and the atmospheric chamber 52, so that springs 58, 86 are effective to urge piston member 60 to -its uppermost position in which both valves 20 and 22 are closed.
When it is desired to make a service brake application following charging of the brake pipe BP, the locomotive brake valve (not shown) is set in a position to achieve a brake pipe air pressure reduction to the degree of brake pipe pressure reduction corresponding to the degree of brake application desired. This reduction of brake pipe air pressure constitutes a pneumatic signal that propagates through the train from front to rear via such brake pipe BP.
Concurrently, a service brake command signal is transmitted via radio from the locomotive to the end-of-train unit EOT corresponding to the reduced locomotive brake pipe air pressure., Microprocessor unit MPU operates in response to that service brake command signal to selectively open the supply solenoid valve SV to effect a controlled increase of control pressure within the stability reservoir SR. This increased control pressure within such stability reservoir SR, as determined by the second pressure transducer T2, is matched within control chamber 66, to the extent .that such piston member 60 is controllably forced downward and accordingly opens valve 20 against the combined force exerted by CE00374722.1 springs 58,86. When the control pressure within the stability reservoir SR is equal to the pressure within control chamber 66 the supply solenoid valve SV and the exhaust solenoid valve EV are closed. In other words, the system is now operated in a lap condition.
For further control of routine service brake applications, the microprocessor MPU will selectively open and close either the supply solenoid valve SV or the exhaust solenoid valve EV to regulate the control pressure within such stability reservoir SR in response to appropriate signals received by the EOT unit to accordingly cause application and release of such service brake as signalled.
When an emergency brake application is desired, microprocessor MPU receives the appropriate radio signal from the locomotive and, in this case, the microprocessor MPU will quickly and fully open the supply solenoid valve SV causing such supply reservoir SR to be charged with compressed air at full brake pipe pressure, which in response thereto will comparably charge the control chamber 66 which will cause the piston number 60 to be forced downward to the maximum extent possible thereby fully opening valve 22.
oe.
Specifically by moving the valve stem 32 downward to the maximum extent, such piston element 80 is caused to move below the cylindrical port 82 thereby permitting the pressurised air in the emergency chamber 44 to be quickly vented via the chamber 76 and exit passage 78. At the same time, the valve 20 is also opened to its maximum extent in order to vent the brake pipe air pressure from such chamber 40. Obviously, the size of piston element 80 and CE00374722.1 its displacement from cylindrical port 82 when valve 20 is fully open, must be such that the rate of brake pressure reduction via valve 20 will be sufficiently fast enough to cause emergency brake application.
With both valves 20 and 22 fully opened, the brake pipe air pressure in chambers 40 and 44 is quickly vented via exhaust passage 78 and the air pressure within such brake pipe BP is quickly vented via branch passage 42, 36 and line 38, which will accordingly cause application of the emergency brake via control valves CV in a well-known manner.
As should be apparent from the above detailed description, a number of modifications and other embodiments could be incorporated without departing from the spirit of the invention.
Therefore, while the detailed description above represents the 15 preferred value and valve control arrangement, it should be apparent that a great number of changes could be incorporated and varied embodiments could be devised without departing from either the spirit of the invention or the scope of the appended clis gee• claims.
go ooooo o
Claims (3)
- 2. The microprocessor controlled regulating valve system, according to claim i, wherein said regulating valve device includes: a housing defining an elongated bore therein; CE00374722.1 an elongated valve stem disposed within said elongated bore for reciprocal movement therein; a primary supply passage to which such brake pipe is connected in fluid communication with a first end of said elongated bore; a branch supply passage to which such brake pipe is connected in fluid communication with a second end of said elongated bore; an exhaust passage open to atmosphere and in fluid communication with said elongated bore between said primary and said branch supply passages; a first valve incorporated with said elongated valve stem between said primary supply passage and said exhaust oooe 0.0 passage; S. 5 a second valve incorporated with said elongated valve stem between said branch supply passage and said exhaust passage; oo a compression spring disposed within said elongated bore and adapted to bias said elongated valve stem and thus said 20 first and said second valves to a closed position; and a pneumatic drive means for moving said elongated valve stem in response to said control pressure received from said electro pneumatic control means such that upon receiving a service control pressure, said pneumatic drive means without opening said second valve opens said first valve to an extent dictated by a magnitude of said service control pressure to effect a controlled air pressure reduction in such brake pipe through said first valve at said first service rate and (ii) CE00374722.1 upon receiving an emergency control pressure, said pneumatic drive means fully opens said second valve and said fist valve along therewith to effect a quick air pressure reduction in such brake pipe through aid valves at said emergency rate.
- 3. The microprocessor controlled regulating valve system, according to claim 2, wherein said pneumatic drive means includes a diaphragm operated piston within said elongated bore above said elongated valve stem, said diaphragm operated piston being able to move said elongated valve stem within said elongated bore against said compression spring to an extent dictated by said control pressure then being received in a control volume defined in said housing directly above said diaphragm operated piston. S4. The microprocessor controlled regulating valve system, according to claim 3, wherein said electro pneumatic control means includes: o a stability reservoir pneumatically connected to said 0 00 control volume; eeee a solenoid operated supply valve, openable by said 20 microprocessor unit by one of said electrical control signals, e• through which said stability reservoir can be pressurised from such brake pipe; a solenoid operated exhaust valve, openable by said microprocessor unit by another of said electrical control signals, through which said stability reservoir can be exhausted; and a second pressure transducer for converting pressure in said stability reservoir and for transmitting a second electrical signal representative thereof to said microprocessor CE00374722.1 unit; said microprocessor unit, in response to said first and said second electrical signals from said pressure transducers and to said brake command signal from such locomotive, for controlling pressure within said stability reservoir and thereby control said control pressure within said stability reservoir and thereby control said control pressure delivered to said control volume of said regulating valve device. The microprocessor controlled regulating valve system, according to claim 2, wherein said first valve includes a make conical valve head engageable with a female conical valve seat.
- 6. The microprocessor controlled regulating valve system, according to claim 2, wherein said second valve includes a male cylindrical valve body reciprocally disposed within a mating female cylindrical valve seat. 15 7. A microprocessor controlled regulating valve system substantially as hereinbefore described with reference to figures 2 and 3 of the accompanying drawings. coo• c ~Dated this 20th day of December 2000 20 Westinghouse Air Brake Company e• By Their Patent Attorney, oe FREEHILLS CARTER SMITH BEADLE
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU72507/00A AU747864B2 (en) | 1997-03-11 | 2000-12-22 | Microprocessor controlled pneumatically driven valve system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/815422 | 1997-03-11 | ||
AU72507/00A AU747864B2 (en) | 1997-03-11 | 2000-12-22 | Microprocessor controlled pneumatically driven valve system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU58343/98A Division AU730962B2 (en) | 1997-03-11 | 1998-03-10 | Pneumatically driven train brake pipe pressure exhaust valve |
Publications (2)
Publication Number | Publication Date |
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AU7250700A true AU7250700A (en) | 2001-07-19 |
AU747864B2 AU747864B2 (en) | 2002-05-23 |
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Application Number | Title | Priority Date | Filing Date |
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AU72507/00A Ceased AU747864B2 (en) | 1997-03-11 | 2000-12-22 | Microprocessor controlled pneumatically driven valve system |
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AU (1) | AU747864B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10994756B2 (en) | 2017-11-16 | 2021-05-04 | Westinghouse Air Brake Technologies Corporation | Electronically controlled brake overlay system for distributor valve |
US11014585B2 (en) | 2017-11-16 | 2021-05-25 | Westinghouse Air Brake Technologies Corporation | ECP overlay system for W-type triple valve |
US11027756B2 (en) | 2017-11-16 | 2021-06-08 | Westinghouse Air Brake Technologies Corporation | ECP overlay system for UIC-type distributor valve |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2639908A (en) * | 1950-04-21 | 1953-05-26 | Merle J Graham | Flush gun for automobile radiators |
US4615353A (en) * | 1984-01-24 | 1986-10-07 | Mckee James E | Pneumatic control valves with diaphragm actuators and modular body structure |
US5586813A (en) * | 1995-04-27 | 1996-12-24 | Westinghouse Air Brake Company | Electro-pneumatic freight brake control system |
-
2000
- 2000-12-22 AU AU72507/00A patent/AU747864B2/en not_active Ceased
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10994756B2 (en) | 2017-11-16 | 2021-05-04 | Westinghouse Air Brake Technologies Corporation | Electronically controlled brake overlay system for distributor valve |
US11014585B2 (en) | 2017-11-16 | 2021-05-25 | Westinghouse Air Brake Technologies Corporation | ECP overlay system for W-type triple valve |
US11027756B2 (en) | 2017-11-16 | 2021-06-08 | Westinghouse Air Brake Technologies Corporation | ECP overlay system for UIC-type distributor valve |
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