Tire pressure sensor array

• US 6,935,169 B2
• Filed: 10/28/2002
• Issued: 08/30/2005
• Est. Priority Date: 10/28/2002
• Status: Expired due to Fees

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Newman, Robert A., Rodriguez, Lorenzo Guadalupe, Sanchez, Francisco J
• Primary Examiner(s): Oen, William
• Assistant Examiner(s): ALLEN, ANDRE J
• Application Number:
  US10/281,616
• Publication Number:
  US 20040079144A1
• Time in Patent Office: 1,037 Days
• Field of Search: 731/46, 731/462, 731/463, 731/464, 731/465, 731/468, 340/447, 340/442, 340/444
• US Class Current: 73/146
• 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 tire pressure sensor array includes a control module to which a receiver is connected. Four tire pressure sensors communicate with the control module via the receiver. Each tire pressure sensor includes a pressure switch that is electrically connected to a digital state machine. The digital state machine is connected to a transmitter and communicates pressure information to the transmitter. In turn, the transmitter communicates the pressure information to the receiver which communicates the pressure information to the control module.

Claims

1. A tire pressure sensor array, comprising:

a control module;

at least one receiver electrically connected to the control module; and

at least four tire pressure sensors in communication with the control module via the receiver, each tire pressure sensor including a pressure switch generating a digital pressure signal at a predetermined pressure level, a digital state machine electrically connected to the pressure switch for receiving said digital pressure signal and providing a digital signal representing pressure information, and a transmitter connected to the digital state machine for receiving the pressure information and wirelessly transmitting said pressure information to the receivers;

wherein each pressure switch comprises

a plate;

a rib extending from the plate to establish at least one cavity on the plate;

at least two lower contacts disposed on the plate within the cavity;

at least one diaphragm disposed on the rib and enclosing the cavity; and

at least two upper contacts disposed on the diaphragm above the second lower contact, the pressure switch movable between an open position wherein the upper contacts do not engage the lower contacts, a first closed position wherein one upper contact engages one lower contact, and a second closed position wherein each upper contact engages a respective lower contact.

2. The tire pressure sensor array of claim 1, wherein the pressure switch further comprises:

a central rib extending from the plate, the central rib dividing the cavity into a first cavity and a second cavity;

a first lower contact disposed within the first cavity; and

a second lower contact disposed within the second cavity.

3. The tire pressure sensor array of claim 2, wherein the diaphragm is a first diaphragm that encloses the first cavity and the second cavity and the switch further comprises:

a second diaphragm affixed to the first diaphragm, the second diaphragm spanning the area above the second cavity.

4. The tire pressure sensor array of claim 3, wherein the pressure switch further comprises:

a first upper contact affixed to the first diaphragm above the first lower contact; and

a second upper contact affixed to the first diaphragm above the second lower contact.

5. The tire pressure sensor array of claim 4, wherein the pressure switch is movable between an open position wherein the upper contacts do not engage the lower contacts, a first closed position wherein the first upper contact engages the first lower contact, and a second closed position wherein the first upper contact continues to engage the first lower contact and wherein the second upper contact en ages the second lower contact.

6. A tire pressure sensor array, comprising:

a control module;

at least one receiver electrically connected to the control module; and

at least four tire pressure sensors in communication with the control module via the receiver, each tire pressure sensor including at least one pressure switch that includes at least one cavity, at least one lower contact disposed within e cavity, at least one diaphragm enclosing the cavity, and at least one upper contact disposed on the diaphragm above the lower contact

wherein each pressure switch includes at least one cavity, at least two lower contacts disposed within the cavity, at least one diaphragm enclosing the cavity, and at least two upper contacts disposed on the diaphragm above the lower contacts; and

wherein each pressure switch is movable between an open position wherein the upper contacts do not engage the lower contacts, a first closed position wherein one upper contact engages a respective lower contact, and a second closed position wherein each upper contact engages a respective lower contact.

7. The tire pressure sensor array of claim 6, wherein the pressure switch comprises:

a first cavity and a second cavity;

a first lower contact disposed within the first cavity; and

a second lower contact disposed within the second cavity.

8. The tire pressure sensor array of claim 7, wherein the diaphragm is a first diaphragm that encloses the first cavity and the second cavity an the pressure switch further comprises:

a second diaphragm affixed to the first diaphragm, the second diaphragm spanning the area above the second cavity.

9. The tire pressure sensor array of claim 8, wherein the pressure switch comprises:

a first upper contact affixed to the first diaphragm above the first lower contact; and

a second upper contact affixed to the first diaphragm above the second lower contact.

10. The tire pressure sensor array of claim 6, wherein each pressure switch is electrically connected to a digital state machine that is connected to a transmitter.

11. The tire pressure sensor array of claim 10, wherein the pressure switch provides digital signals to the digital state machine based on at least one predetermined pressure level.

12. The tire pressure sensor array of claim 11, wherein the digital state machine detects digital inputs from the pressure switch and generates digital signals representing pressure information.

13. The tire pressure sensor array of claim 12, wherein the digital state machine communicates the pressure information to the transmitter, the transmitter communicates the pressure information to the receiver, and the receiver communicates the pressure information to the control module.