US3768519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulator for adaptive braking system
Assignee: Bendix Corp
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Filing: 1971-11-16
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Granted: 1973-10-30
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Expires: 1991-11-16
Abstract
Abstract An adaptive braking control valve is mounted in the primary chamber of a standard relay valve used to control brake actuation in a vehicle equipped with air-actuated brakes. The adaptive braking control valve responds to an output signal from a logic controller to permit the air pressure in the primary chamber of the relay valve to decay when an incipient skidding condition is sensed at the control wheel, and subsequently permits the pressure level in the primary chamber to increase at a controlled rate. The relay valve responds to pressure changes in the primary chamber to control communication of air pressure to the vehicle''s brakes in the normal manner. Therefore, the relay valve equipped with the adaptive braking control valve functions as an adaptive braking modulator to prevent a skidding condition in the control wheel.
Inventors
- 👤 R Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5018; B60T8/36; B60T8/3615; B60T8/362; B60T8/5087; Y; Y10; Y10S; Y10S188/00; Y10S188/02; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
213 words
In a relay valve having a primary chamber, a delivery chamber, first valve means responsive to the pressure differential between said primary and delivery chambers to maintain the pressure level in the delivery chamber substantially the same as the pressure level in the primary chamber, and first passage means communicating said primary chamber with a pressure control device; a housing defining a bore therewithin; normally open second valve means controlling fluid communication through said first passage means, said normally open second valve means including piston means slidably mounted in said bore for actuating said normally open second valve means; said piston means cooperating with the end of said bore to define a control chamber therebetween; second passage means communicating said control chamber with the fluid pressure level communicated to said primary chamber; and electrically operated valve means normally preventing fluid communication through said second passage Means, but actuable to a position permitting fluid communication through the latter to vent the primary chamber to the control chamber to abruptly reduce the pressure level in the primary chamber and increase the pressure level in the control chamber, whereby the increased pressure level in the control chamber moves said piston means to close said normally open valve means, thereby restricting fluid communication into said primary chamber.
Claim 2
Dependent Claim
213 words
In a relay valve having a primary chamber, a delivery chamber, first valve means responsive to the pressure differential between said primary and delivery chambers to maintain the pressure level in the delivery chamber substantially the same as the pressure level in the primary chamber, and first passage means communicating said primary chamber with a pressure control device; a housing defining a bore therewithin; normally open second valve means controlling fluid communication through said first passage means, said normally open second valve means including piston means slidably mounted in said bore for actuating said normally open second valve means; said piston means cooperating with the end of said bore to define a control chamber therebetween; second passage means communicating said control chamber with the fluid pressure level communicated to said primary chamber; and electrically operated valve means normally preventing fluid communication through said second passage Means, but actuable to a position permitting fluid communication through the latter to vent the primary chamber to the control chamber to abruptly reduce the pressure level in the primary chamber and increase the pressure level in the control chamber, whereby the increased pressure level in the control chamber moves said piston means to close said normally open valve means, thereby restricting fluid communication into said primary chamber.
Claim 3
Dependent Claim
54 words
The invention of claim 1: said piston means being stepped to present larger and smaller faces with a shoulder therebetween; said larger face of said piston being exposed to the fluid pressure level in said control chamber, said smaller face of said piston being exposed to the fluid pressure level in said primary chamber.
Claim 4
Dependent Claim
45 words
The invention of claim 2; and stop means within said bore; and resilient means yieldably urging said piston means into engagement with said stop means to thereby establish a predetermined volume for said control chamber when fluid communication through said second passage means is prevented.
Claim 5
Dependent Claim
33 words
The invention of claim 2; and a first flow restricting orifice for permitting fluid to flow from said control chamber to decrease the pressure level in said control chamber at a controlled rate.
Claim 6
Dependent Claim
54 words
The invention of claim 4; and a second flow restricting orifice for permitting fluid to flow into said primary chamber at a limited rate when said normally open second valve means is closed, said second flow restricting orifice permitting flow of fluid therethrough at a lesser rate than does said first flow restricting orifice.
Claim 7
Dependent Claim
32 words
The invention of claim 2; and a flow restricting orifice for permitting fluid to flow into said primary chamber at a limited rate when said normally open second valve means is closed.
Claim 8
Dependent Claim
34 words
The invention of claim 2: said normally open second valve means including a first valve member in said first passage means and a second valve member carried on the smaller face of the piston.
Claim 9
Dependent Claim
63 words
The invention of claim 7: said first valve member dividing said first passage means into an inlet section communicating with said pressure control device and an outlet section communicating with said primary chamber; said second passage means extending through said piston to communicate said outlet section with said control chamber when the second valve member is sealingly engaged with the first valve member.
Claim 10
Dependent Claim
206 words
In a relay valve having a primary chamber, a delivery chamber, first valve means responsive to the pressure differential between said primary and delivery chambers to maintain the pressure level in the delivery chamber substantially the same as the pressure level in the primary chamber, and passage means communicating said primary chamber with a pressure control device; normally open second valve means controlling fluid communication through said passage means; electrically operated valve means responsive to the output of a logic controller to close said normally open second valve means to restrict fluid flow from said pressure control device into said primary chamber and simultaneously exhaust the fluid pressure from said primary chamber at a relatively rapid initial rate for a limited time period; a first flow restricting orifice permitting limited flow of fluid from said primary chamber at a lesser rate after said limited time period has expired while said electrically operated valve means is actuated; and a second flow restricting orifice permitting limited fluid flow from said pressure control device into said primary chamber when said normally open valve means is closed; the rate of fluid flow permitted through said first orifice being greater than the rate of fluid flow permitted through said second orifice.
Claim 11
Dependent Claim
206 words
In a relay valve having a primary chamber, a delivery chamber, first valve means responsive to the pressure differential between said primary and delivery chambers to maintain the pressure level in the delivery chamber substantially the same as the pressure level in the primary chamber, and passage means communicating said primary chamber with a pressure control device; normally open second valve means controlling fluid communication through said passage means; electrically operated valve means responsive to the output of a logic controller to close said normally open second valve means to restrict fluid flow from said pressure control device into said primary chamber and simultaneously exhaust the fluid pressure from said primary chamber at a relatively rapid initial rate for a limited time period; a first flow restricting orifice permitting limited flow of fluid from said primary chamber at a lesser rate after said limited time period has expired while said electrically operated valve means is actuated; and a second flow restricting orifice permitting limited fluid flow from said pressure control device into said primary chamber when said normally open valve means is closed; the rate of fluid flow permitted through said first orifice being greater than the rate of fluid flow permitted through said second orifice.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |