SYSTEM AND METHOD FOR MEASURING A RELATIVE DISTANCE BETWEEN VEHICLE COMPONENTS USING ULTRA-WIDEBAND TECHNIQUES

• US 20100225527A1
• Filed: 03/09/2009
• Published: 09/09/2010
• Est. Priority Date: 03/09/2009
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: NAMUDURI, CHANDRA S., ELLIOTT, ROBERT B., LI, YUNJUN, TALTY, TIMOTHY J., MCMAHON, NANCY
• Granted Patent: US 7,956,797 B2
• Time in Patent Office: Days
• US Class Current: 342/145
• CPC Class Codes: B60G 13/14 having dampers accumulating utilisable energy, e.g. compressing air fluid springs with an accumulator B60G11/30
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 2204/112 on dampers, e.g. fluid dampers
• CPC Class Codes: B60G 2204/1162 directly mounted on the suspension arm
• CPC Class Codes: B60G 2204/128 Damper mount on vehicle body or chassis
• CPC Class Codes: B60G 2206/41 Dampers
• CPC Class Codes: B60G 2300/60 Vehicles using regenerative power
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2400/95 Position of vehicle body elements
• CPC Class Codes: B60G 2401/17 Magnetic/Electromagnetic
• CPC Class Codes: B60G 2600/22 Magnetic elements
• CPC Class Codes: B60G 2800/91 Suspension Control
• CPC Class Codes: F16F 9/3292 Sensor arrangements
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/10 using transmission of interrupted, pulse modulated waves determination of distance by phase measurement G01S13/32
• CPC Class Codes: G01S 13/88 Radar or analogous systems specially adapted for specific applications electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00

Abstract

A system for measuring relative distance between a first component on a vehicle and a second component on the vehicle is provided. The system includes a wireless ultra-wideband (UWB) transceiver attached to the first component. The wireless UWB transceiver transmits a UWB measurement pulse toward the second component, and receives a reflected UWB pulse from a reflective surface of the second component. The reflected UWB pulse represents a reflected version of the UWB measurement pulse. The system also includes a processor coupled to the wireless UWB transceiver. The processor derives a relative distance between the first component and the second component, based upon characteristics of the UWB measurement pulse and the reflected UWB pulse. The system further includes a power generating system for the wireless UWB transceiver. The power generating system generates operating voltage for the wireless UWB transceiver from kinetic energy associated with motion of the first component relative to the second component.

Claims

1. A system for measuring relative distance between a first component on a vehicle and a second component on the vehicle, the system comprising:

a wireless ultra-wideband (UWB) transceiver attached to the first component, the wireless UWB transceiver being configured to transmit a UWB measurement pulse toward the second component, and to receive a reflected UWB pulse from a reflective surface of the second component, wherein the reflected UWB pulse represents a reflected version of the UWB measurement pulse;

a processor coupled to the wireless UWB transceiver, the processor being configured to derive a relative distance between the first component and the second component, based upon characteristics of the UWB measurement pulse and the reflected UWB pulse; and

a power generating system for the wireless UWB transceiver, the power generating system being configured to generate operating voltage for the wireless UWB transceiver from kinetic energy associated with motion of the first component relative to the second component.

2. The system of claim 1, the processor being configured to derive the relative distance based upon a propagation time associated with the UWB measurement pulse and the reflected UWB pulse.

3. The system of claim 1, the power generating system comprising:

a magnet attached to the first component such that the magnet moves in concert with the first component; and

a coil attached to the second component such that the coil moves in concert with the second component;

wherein

motion of the first component relative to the second component establishes electrical current in the coil.

4. The system of claim 1, the power generating system comprising:

a magnet attached to the second component such that the magnet moves in concert with the second component; and

a coil attached to the first component such that the coil moves in concert with the first component;

wherein

motion of the first component relative to the second component establishes electrical current in the coil.

5. The system of claim 1, the power generating system comprising an electromagnetic energy harvester attached to the first component, the electromagnetic energy harvester being configured to produce electrical current in response to motion of the first component.

6. The system of claim 1, the power generating system comprising an electromagnetic energy harvester attached to the second component, the electromagnetic energy harvester being configured to produce electrical current in response to motion of the second component.

7. The system of claim 1, wherein:

the first component is an unsprung component of the vehicle; and

the second component is a sprung component of the vehicle.

8. The system of claim 1, wherein:

the first component is a sprung component of the vehicle; and

the second component is an unsprung component of the vehicle.

9. The system of claim 1, wherein:

the first component is an unsprung portion of a suspension damper assembly of the vehicle; and

the second component is a sprung portion of the suspension damper assembly.

10. The system of claim 1, wherein:

the first component is a sprung portion of a suspension damper assembly of the vehicle; and

the second component is an unsprung portion of the suspension damper assembly.

11. A system for measuring relative distance between a first component on a vehicle and a second component on the vehicle, the system comprising:

an ultra-wideband (UWB) transceiver coupled to the first component, the UWB transceiver being configured to operate in a measurement mode and a reporting mode;

a reflector on the second component, the reflector being configured to reflect UWB measurement pulses generated by the UWB transceiver; and

a processor coupled to the UWB transceiver, the processor being configured to control operation of the UWB transceiver in the measurement mode and the reporting mode;

wherein

while operating in the measurement mode, the UWB transceiver transmits a UWB measurement pulse toward the reflector, and receives a reflected UWB pulse from the reflector, the reflected UWB pulse representing a reflected version of the UWB measurement pulse;

while operating in the measurement mode, the processor calculates a relative distance between the first component and the second component, based upon characteristics of the UWB measurement pulse and the reflected UWB pulse; and

while operating in the reporting mode, the UWB transceiver transmits one or more signals that convey information associated with the relative distance.

12. The system of claim 11, further comprising a control module comprising a UWB receiver located within range of the UWB transceiver, the UWB receiver being configured to receive the one or more signals transmitted by the UWB transceiver during the reporting mode.

13. The system of claim 11, further comprising a power generating system for the UWB transceiver and the processor, the power generating system being configured to generate voltage in response to movement of the first component and/or the second component.

14. The system of claim 13, wherein the power generating system comprises:

a magnet attached to one of the first component or the second component; and

a coil attached to the other one of the first component or the second component;

wherein

movement of the first component relative to the second component induces electrical current in the coil.

15. The system of claim 14, further comprising a rechargeable energy source coupled to the coil, wherein the rechargeable energy source is configured to provide operating power for the processor and the UWB transceiver, and wherein the rechargeable energy source is recharged in response to the electrical current induced in the coil.

16. A method of measuring relative distance between a first component on a vehicle and a second component on the vehicle, the method comprising:

generating electrical current in response to movement of the first component;

converting the electrical current into a DC operating voltage for an ultra-wideband (UWB) transceiver that is attached to the first component;

transmitting a UWB measurement pulse from the UWB transceiver, the UWB measurement pulse being directed toward a reflective element of the second component;

the UWB transceiver receiving, in response to the UWB measurement pulse, a reflected UWB pulse from the reflected element; and

determining a distance measurement based upon a propagation time associated with the UWB measurement pulse and the reflected UWB pulse, the distance measurement indicating distance between the first component and the second component.

17. The method of claim 16, further comprising the step of charging an energy storage element with the DC operating voltage.

18. The method of claim 16, further comprising the step of transmitting, with the UWB transceiver, one or more signals that convey information associated with the distance measurement.

20. The method of claim 16, wherein:

one of the first component or the second component includes a magnet attached thereto;

the other one of the first component or the second component includes a coil attached thereto; and

generating electrical current comprises inducing the electrical current in the coil with the magnet, in response to movement of the magnet relative to the coil.

19. The method of claim 19, further comprising the step of receiving the one or more signals, using a UWB receiver of a control module onboard the vehicle.