Distributed intelligence vehicular tire air pressurization system and method

• US 5,629,873 A
• Filed: 03/08/1995
• Issued: 05/13/1997
• Est. Priority Date: 03/08/1995
• Status: Expired due to Fees

• Current Assignee: CM Automotive Systems, Inc.
• Original Assignee: CM Automotive Systems, Inc.
• Inventors: Stanley, Glenn M., Mittal, Chander P.
• Primary Examiner(s): Cosimano, Edward R.
• Assistant Examiner(s): Wachsman, Hal D.
• Application Number:
  US08/401,087
• Time in Patent Office: 797 Days
• Field of Search: 364/558, 364/506, 364/508, 364/426.02, 364/424.03, 364/424.05, 364/550, 364/551.01, 152/415-417, 137/224, 137/224.5, 137/227-229, 73/146.2-146.5, 141/38, 141/95, 141/197, 340/442-444
• US Class Current: 702/140
• CPC Class Codes: B60C 23/00354 Details of valves
• CPC Class Codes: B60C 23/00372 characterised by fluid diagrams
• CPC Class Codes: B60C 23/009 having wheels on a trailer
• CPC Class Codes: B60C 23/0401 characterised by the type of alarm
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

Abstract

A vehicular tire air pressurization system having an intelligent controller for macro control is connected to one or more intelligent manifolds for micro control so as to distributively process air pressurization functions, with the controller having non volatile memory which is field programmable and alterable for storing current operating conditions, functions and parameters for communicating desired air pressures to the manifolds each connected to at least one set of tires and each including non volatile memory for storing pressurization parameters used to control inflation and deflation of the sets of tires to the desired pressures subject to the pressurization parameters which are also field programmable and alterable and which are updated after periodic pressure adjustment cycles, so that, the tires are efficiently pressurized and maintained at the desired pressures even during changing performance characteristics.

Claims

1. A system in a vehicle for adjusting respective tire air pressures in respective sets of tires using an air supply, said system comprising,

a controller means comprising a memory means for storing programs, processor means for executing said programs, and a communication means for transmitting respective commands communicating sets of respective desired pressures, said controller means for selecting one of a plurality of operating conditions referenced to one of said sets of respective desired pressures and for generating said respective commands communicating respective desired pressures for said respective sets of tires,

a plurality of respective manifold means comprising respective manifold controller means each of which comprising respective manifold memory means for storing respective manifold programs, respective manifold processor means for executing said respective manifold programs, respective manifold communication means for receiving said respective commands, said respective manifold controller means for monitoring said respective tire air pressures in said respective sets of tires, said respective manifold controller means for respectively responding to said respective commands for adjusting said respective tire air pressures to said respective desired pressures, said plurality of respective manifold means further comprises respective inflation means for supplying respective supply air from said air supply to said respective sets of tires, respective deflation means for exhausting respective exhaust air from said respective sets of tires, and respective air pressure sensors for sensing said respective tire air pressures in said respective sets of tires, said respective commands identifying said respective manifold means independently responding and adjusting said respective tire air pressures to said respective desired pressures in said respective sets of tires, and

a plurality of respective air channel means respectively connected between said respective inflation means, said respective deflation means, and said respective set of tires for communicating said respective supply air to said respective sets of tires, for communicating said respective exhaust air from said respective sets of tires, and for communicating said respective tire air pressures from said respective sets of tires to said respective air pressure sensor.

2. The system of claim 3 wherein said controller means further comprises a panel means for selecting and displaying one of said plurality of operating conditions for selecting said respective desired pressures for said respective sets of tires.

3. The system of claim 1 wherein said respective commands identify said respective air channel means, said plurality of respective manifold means is one manifold, said system further comprising,

a gating means for communicating said respective supply air and said respective exhaust air between said one gating manifold and said respective air channel means, said gating means connected to and controlled by said respective manifold controller means for routing one at a time said respective air channel means to said one gating manifold.

4. The system of claim 1 wherein said plurality of respective manifold means each further comprises respective shut off means controlled by said respective manifold controller means for evacuating said respective tire air pressure from said respective air channel means, said system further comprises,

respective wheel valve means each respectively connected between said respective air channel means and said respective sets of tires, said respective wheel valve means for communicating said respective supply air to said respective sets of tires during inflation, for communicating said respective exhaust air from said respective sets of tires during deflation, and for shutting off air communication to and from said respective sets of tires when said respective air channel means is evacuated.

5. The system of claim 1 wherein one of said respective manifold means comprises a select valve means connected to said respective air pressure sensor, said respective air channel means, and to atmosphere, said select valve means controlled by said respective manifold controller means, said select valve means for communicating atmosphere to said respective air pressure sensor for sensing atmospheric null pressure or for communicating said respective tire air pressure in said respective air channel means to said respective air pressure sensor for sensing said respective tire air pressures.

6. The system of claim 1 wherein said controller means further comprises,

speed detection means connected to said vehicle and to said processor means for sensing vehicular speed, and

panel means for selecting and displaying said one of said plurality of operating conditions, said plurality of operating conditions are referenced to speed ranges, said processor means for determining when said vehicular speed is within one of said speed ranges referenced to said one of said plurality of operating conditions.

7. The system of claim 1 wherein said respective manifold memory means comprises non volatile memory for storing respective parameter values comprising respective offset values used by said respective manifold processor means to adjust said respective desired pressures, said respective desired pressures and said offset values provide respective target pressures, said respective manifold processor means is for controlling said respective inflation means and said respective deflation means for adjusting said respective tire air pressures until said respective tire air pressures reach said respective target pressures sensed by said respective air pressure sensors, said respective manifold processor means is for waiting predetermined respective static time periods for sensing respective static air pressures by said respective air pressure sensors and for recomputing and storing said respective offset values equal to the difference of said respective target pressures and said respective static air pressures.

8. The system of claim 1 wherein said respective manifold memory means comprises rewritable non volatile memory for storing respective parameter values, said controller means further comprises,

a panel means for entering said respective parameter values communicated to said respective manifold controller means for controlling the operation of said respective inflation means and said respective deflation means for adjusting said respective tire air pressures to said respective desired pressures.

9. The system of claim 1 wherein said memory means comprises rewritable non volatile memory for storing entered data, said controller means further comprises,

a panel means for entering said entered data stored in said non volatile memory, said entered data is received by said processor means for communicating said respective desired pressures to said respective manifold controller means for maintaining said respective sets of tires at said respective desired pressures.

10. The system of claim 9 wherein said sets of respective desired pressures are organized as groups of sets of respective desired pressures, said controller means comprises a speed detection means connected to said vehicle and wherein said entered data comprises,

control data comprising over speed detection data for detecting over speed conditions to automatically adjust said tire air pressures, automatic power up start data for automatically starting pressure adjustments of said tire air pressures after starting said vehicle, and automatic pressure adjustment restart data for automatically periodically readjusting said tire air pressures,

model numbers each of which referenced to and for selecting one of said groups of said sets of respective desired pressures,

low air value for determining when said air supply is low and to disable all of said respective inflation means to conserve said air supply, and

flat tire value for determining when any one of said respective sets of tires is flat.

11. A method for adjusting respective tire pressures of respective sets of tires in a vehicle having an air supply communicated through respective air channels and respective manifolds controlled by a selecting controller, said method comprising the steps of,

storing in said selecting controller sets of respective desired pressures respectively referenced to operating conditions and to said respective sets of tires,

receiving select data referenced to one of said operating conditions to select one of said sets of respective desired pressures,

transmitting respective commands communicating said respective desired pressures from said selecting controller respectively to said respective manifolds, said one set of respective desired pressures referenced to one of said operating conditions, said respective desired pressures referenced to said respective sets of tires,

sensing in said respective manifolds respective static pressures of said respective tire air pressures in said respective air channels,

determining in said respective manifolds if said respective static pressures are above or below said respective desired pressures,

inflating in said respective manifolds said respective tire air pressures to said respective desired pressures when said respective static pressures are below said respective desired pressures, and

deflating in said respective manifolds said respective tire air pressures to said respective desired pressures when said respective static pressures are above said respective desired pressures.

12. The method of claim 11 further comprising the steps of,

storing in said selecting controller groups of said sets of respective desired pressures respectively referenced to vehicular model numbers and said operating conditions and said respective sets of tires, and

receiving vehicular model number data to select one of said vehicular model numbers to select one of said groups of said sets of respective desired pressures.

13. The method of claim 11 further comprising the steps of,

storing in said respective manifolds respective offset values,

computing respective target pressures by combining said respective offset values with said desired pressures,

sensing respective dynamic pressures during said inflating step,

sensing respective dynamic pressures during said deflating step,

terminating said inflation step when said respective dynamic pressures equal said respective target pressures,

terminating said deflation step when said respective dynamic pressures equal said respective target pressures,

waiting respective stabilization time periods after each of said inflating step and deflating step,

sensing said respective static air pressures, and

determining said respective offset values equal to said respective static pressures minus said respective target pressures.

14. The method of claim 11 further comprising the steps of,

storing respective pressure bands in said respective manifolds,

adding said respective pressure bands to said respective desired pressures resulting in respective desired pressure bands,

determining during said determining step if said respective static pressures are within said respective desired pressure bands,

inflating during said inflating step said respective tire air pressures to said respective desired pressures when said respective static pressures are below said desired pressure bands, and

deflating during said deflating step said respective tire air pressures to said respective desired pressures when said respective static pressures are above said respective desired pressure bands.

15. The method of claim 11 further comprising the steps of,

storing in said respective manifolds respective deflation offsets and respective inflation offsets for said respective desired pressures,

storing respective pressure bands in said respective manifolds,

sensing respective atmospheric null pressures,

adjusting said respective static pressures by said respective atmospheric null pressures,

adding said respective pressure bands to said respective desired pressures resulting in respective desired pressure bands,

determining during said determining step if said respective static pressures are within said respective desired pressure bands,

computing respective target pressures by adding said respective inflation offsets to said respective desired pressures when said respective static pressures are below said respective desired pressure bands,

computing respective target pressures by subtracting said respective deflation offsets from said respective desired pressures when said respective static pressures are above said respective desired pressure bands,

sensing respective dynamic pressures during said inflating step,

sensing respective dynamic pressures during said deflating step,

inflating during said inflating step said respective tire air pressures to said respective target pressures when said respective static pressures are below said respective desired pressure bands,

deflating during said deflating step said respective tire air pressures to said respective target pressure when said static pressures are above said respective desired pressure bands,

terminating said inflating step when said respective dynamic pressures equal said respective target pressures,

terminating said deflating step when said respective dynamic pressures equal said respective target pressures,

waiting respective stabilization time periods,

sensing said respective static pressures, and

adjusting said respective static pressures with said respective atmospheric null pressures,

computing and storing in said respective manifolds said respective inflation offsets equal to said respective static pressures minus said respective target pressures, and

computing and storing in said respective manifolds said respective deflation offsets equal to said respective static pressures minus said target pressure.

16. The method of claim 11 further comprising the steps of,

storing a restart time period in said selecting controller,

waiting said restart time period before said transmitting step, and

repetitively executing said waiting step and said transmitting step.

17. The method of claim 11 further comprising the steps of,

storing in said selecting controller speed ranges respectively referenced to said operating conditions,

storing an over speed delay time period in said controller,

referencing said one of said operating conditions to one of said speed ranges to select a speed range,

sensing vehicular speed,

determining if said vehicular speed is within said speed range,

waiting said over speed delay time period when said vehicular speed is not within said speed range,

rereferencing said operating condition to another one of said operating conditions after said over speed delay time period when said vehicular speed is not within said speed range, and

communicating to said respective manifolds another one of said sets of respective desired pressures referenced to said another one of said operating conditions.