Apparatus for repeatable adjustment of tire pressure

• US 5,309,969 A
• Filed: 12/17/1991
• Issued: 05/10/1994
• Est. Priority Date: 12/17/1991
• Status: Expired due to Term

• Current Assignee: CM Automotive Systems, Inc.
• Original Assignee: CM Automotive Systems, Inc.
• Inventors: Mittal, Chander
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Lorin, Francis J.
• Application Number:
  US07/809,584
• Time in Patent Office: 875 Days
• Field of Search: 152/415, 152/416, 152/417, 137/224, 137/224.5, 364/558
• US Class Current: 152/415
• CPC Class Codes: B60C 23/00318 on the wheels or the hubs
• CPC Class Codes: B60C 23/00354 Details of valves
• CPC Class Codes: B60C 23/00363 Details of sealings
• CPC Class Codes: B60C 23/00372 characterised by fluid diagrams
• CPC Class Codes: Y10T 137/3615 Pulsating

Abstract

An apparatus for adjusting the air pressure in a vehicle tire is provided. The apparatus includes an air source, a manifold, a transducer, a valve, and a controller. The valve includes a valve seat with a first and a second chamber and a piston which is movable reciprocally with the valve body between the two chambers. The valve also includes a poppet that is movable between the two chambers relative to the piston with a wobbling action. The piston is connected to the valve body by a deformable diaphragm.

Claims

1. An apparatus for adjusting the air pressure within the pneumatic tires of a vehicle having a plurality of tires, comprising:

(a) a source of air under pressure;

(b) a manifold assembly including;

(i) a manifold having a chamber;

(ii) a first valve connected to said manifold and to said source of air under pressure, said first valve being operable to place said chamber in communication with said source of air under pressure; and

(iii) a second valve connected to said manifold assembly in communication with said chamber and with atmosphere, said second valve being operable to place said chamber in communication with atmosphere;

(c) transducer means for measuring the pressure within said chamber and for generating a signal corresponding to the measured pressure;

(d) a valve means disposed between said chamber and each of the pneumatic tires of the vehicle for placing each of said pneumatic tires in fluid communication with said chamber, each said valve means comprising;

(i) a valve body having a valve seat and a first chamber defined by a sloping wall and a second chamber disposed proximate said first chamber;

(ii) a piston reciprocally movable within said valve body relative to said first and second chambers;

(iii) a poppet movable relative to said piston within said first chamber both longitudinally and laterally relative to said valve seat in a wobbling action;

(iv) a resiliently deformable diaphragm connected to said valve body and to said piston for movement with said piston; and

(e) control means connected to said transducer means, and to said first and second valves for receiving said signals generated by said transducer means and for operating said first and second valves in response to said signals in a manner such that said first valve is modulated so as to cause discrete pulses of air under pressure to be directed toward each of said valve means, whereby said poppet thereof will commence said wobbling action causing a self-cleaning wiping action between said valve seat and said poppet.

2. An apparatus as defined in claim 1 in which said control means further functions on command to cause said transducer means to measure a first pressure within said chamber, to then controllably operate said first valve so as to place said chamber in communication with said source of air under pressure for a discrete period of time, to then to cause said transducer means to measure the resultant second pressure within said chamber and finally compare said first and second pressures.

3. An apparatus as defined in claim 2 in which each said valve means further comprises:

(a) an air inlet passageway in communication with said first chamber and with said chamber of said manifold;

(b) an air outlet passageway in communication with one of said pneumatic tires;

(c) a second chamber;

(d) a passageway interconnecting said second chamber and said air inlet passageway, said passageway being substantially smaller than said air inlet passageway.

4. An apparatus as defined in claim 1 in which said transducer means comprises first and second transducers in communication with said chamber of said manifold each of said transducers being connected to said control means for transmitting signals thereto.

5. An apparatus as defined in claim 4 in which said second transducer constantly monitors the air pressure within said chamber.

6. An apparatus for adjusting the air pressure within the pneumatic tires of a vehicle having a plurality of tires, comprising:

(a) a source of air under pressure;

(b) a manifold assembly including;

(i) a first valve connected to said manifold and to said source of air under pressure, said first valve being operable to place said chamber in communication with said source of air under pressure; and

(iii) a second valve connected to said manifold assembly in communication with said chamber and with atmosphere, said second valve being operable to place said chamber in communication with atmosphere;

(c) transducer means for measuring the pressure within said chamber and for generating a signal corresponding to the measured pressure, said transducer means comprising first and second transducers in communication with said chamber of said manifold, said second transducer being adapted to constantly monitor the air pressure within said chamber and for generating a signal corresponding thereto;

(d) a valve means disposed between said chamber and each of the pneumatic tires of the vehicle for placing each of said pneumatic tires in fluid communication with said chamber, each of said valve means comprising;

(i) a valve body having a valve seat and first and second chambers;

(ii) a piston reciprocally movable within said valve body relative to said first and second chambers;

(iii) a poppet movable relative to said piston within said first chamber both longitudinally and laterally relative to said valve seat in a wobbling action; and

(iv) a resiliently deformable diaphragm connected to said valve body and to said piston for movement with said piston; and

(e) control means connected to said transducer means, and to said first and second valves for receiving said signals generated by said transducer means and for operating said first and second valves in response to said signals said control means further functioning on command to cause said second transducer to measure a first pressure within said chamber, to then controllably operable said first valve so as to place said chamber in communication with said source of air under pressure for a discrete period of time, to then cause said second transducer to measure the resultant second pressure within said chamber and finally to compare said first and second pressures.