Distance determining system and method

• US 7,733,239 B2
• Filed: 05/08/2006
• Issued: 06/08/2010
• Est. Priority Date: 05/08/2006
• Status: Active Grant

• Current Assignee: Firestone Industrial Products
• Original Assignee: BFS Diversified Products LLC (Bridgestone Corporation)
• Inventors: Nordmeyer, Daniel L.
• Primary Examiner(s): Maung; Nay A
• Assistant Examiner(s): Perez; Angelica M
• Application Number:
  US11/382,247
• Publication Number:
  US 20070257833A1
• Time in Patent Office: 1,492 Days
• Field of Search: 340/825.72, 340/825.69, 340/686.6, 455/88, 455 411- 413
• US Class Current: 342/125
• CPC Class Codes: B60G 11/27 wherein the fluid is a gas
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 17/052 Pneumatic spring characteristics B60G17/048 takes precedence ; valves per se F16K
• CPC Class Codes: B60G 2202/152 Pneumatic spring
• CPC Class Codes: B60G 2206/42 Springs
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2401/176 Radio or audio sensitive means, e.g. Ultrasonic
• CPC Class Codes: G01S 13/758 using a signal generator powered by the interrogation signal

Abstract

A distance determining system includes a first transceiver and a second transceiver spaced a distance from the first transceiver and inductively coupled thereto. The first transceiver outputs a first electromagnetic wave. The second transceiver receives the first electromagnetic wave and outputs a second electromagnetic wave, which is received by the first transceiver. One of the first and second transceivers determines a distance therebetween based at least in part upon the elapsed time of travel of the first and second electromagnetic waves. An air spring assembly can include such a distance indicating system. A method of determining a distance is also included.

Claims

1. A fluid spring assembly comprising:

a first end member;

a second end member spaced a distance from said first end member;

a flexible wall secured between said first and second end members and at least partially forming a spring chamber therebetween;

a first transceiver supported along said first end member and including a timer, said first transceiver adapted to output a first electromagnetic wave; and

,

a second transceiver supported along said second end member and adapted to receive said first electromagnetic wave and output a second electromagnetic wave;

said first transceiver adapted to receive said second electromagnetic wave, and said timer adapted to determine an elapsed time between said first transceiver outputting said first electromagnetic wave and said first transceiver receiving said second electromagnetic wave.

2. A fluid spring assembly according to claim 1, wherein said timer is adapted to generate an elapsed time signal having a relation to said elapsed time, and said first transceiver includes a processing device in communication with said timer, said processing device adapted for receiving said elapsed time signal and determining said distance based at least in part upon said elapsed time signal.

3. A fluid spring assembly according to claim 2, wherein said first transceiver includes a transmitter adapted to generate a first carrier wave and an antenna in communication with said transmitter, said antenna adapted to broadcast said first carrier wave as said first electromagnetic wave.

4. A fluid spring assembly according to claim 3, wherein said processing device is in communication with said transmitter and communicates a time-zero signal to said transmitter for initiating said first carrier wave and broadcasting said first electromagnetic wave.

5. A fluid spring assembly according to claim 4, wherein said second transceiver includes a memory storing at least a first message, and said second transceiver is adapted to communicate said first message to said first transceiver using said second electromagnetic wave.

6. A fluid spring assembly according to claim 5, wherein said second transceiver includes an antenna, a transmitter in communication with said antenna and operative to generate a carrier wave signal including said first message for broadcasting as said second electromagnetic wave, and a processing device in communication with said memory and said transmitter and adapted to communicate said first message from said memory to said transmitter.

7. A method of determining a distance having a relation to spaced end members of an associated fluid spring assembly, said method comprising:

a) providing a first transceiver supported along an associated first end member and including a timer, said first transceiver operative to output a first electromagnetic wave and receive a second electromagnetic wave;

b) providing a second transceiver supported along an associated second end member, said second transceiver inductively coupled to said first transceiver and operative to receive said first electromagnetic wave and output said second electromagnetic wave;

c) starting said timer;

d) outputting said first electromagnetic wave from said first transceiver;

e) receiving said first electromagnetic wave at said second transceiver;

f) outputting said second electromagnetic wave from said second transceiver;

g) receiving said second electromagnetic wave at said first transceiver;

h) stopping said timer and determining an elapsed time therefrom; and

,

i) determining said distance based at least in part upon said elapsed time.

8. A method according to claim 7 further comprising transmitting a message along with said second electromagnetic wave from said second transceiver to said first transceiver and recovering said message from said second electromagnetic wave.

9. A method according to claim 8 further comprising determining if said message is valid prior to performing h).

10. A method according to claim 7 further comprising communicating said distance to at least one of an external device, an external system or an external network.

11. A method according to claim 7 further comprising inducing electrical energy in said second transceiver using said inductive coupling and selectively discharging said electrical energy to power said second transceiver.