Test vehicle tracking system

• US 6,005,517 A
• Filed: 04/14/1997
• Issued: 12/21/1999
• Est. Priority Date: 04/14/1997
• Status: Expired due to Term

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Chrysler Corporation (Stellantis NV)
• Inventors: Friedrichs, H. Peter
• Primary Examiner(s): Hellner, Mark
• Application Number:
  US08/843,182
• Time in Patent Office: 981 Days
• Field of Search: 342/457, 342/357, 340/991, 701/213
• US Class Current: 342/457
• CPC Class Codes: G01S 1/68 Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information

Abstract

A system for recording vehicle data from vehicles traversing a test track includes a plurality of locator beacons buried in respective well casings around the test track for transmitting location signals. Each beacon includes a transmitter and a microprocessor that controls the transmitter. Receivers are disposed in the test vehicles for receiving the location signals as the vehicles pass by the beacons, and a respective computer receives the position signals from each receiver and formats the signals as appropriate for the vehicle'"'"'s onboard flight recorder. Then, after checking for signal fidelity the computer sends each signal to the flight recorder, which time stamps the position signals along with other data collected from the vehicle. In this way, data can be correlated to particular segments of the test track.

Claims

1. A vehicle test system for recording vehicle data from vehicles traversing a test track, comprising:

a plurality of locator beacons juxtaposed with the test track for transmitting location signals, each beacon including a transmitter and a microprocessor controlling the transmitter;

a plurality of at least partially buried well casings, each well casing for holding a respective beacon, each well casing having an open top end;

a plurality of caps, each cap being removably engaged with a respective well casing to cover the respective top end thereof;

at least one receiver disposable in a test vehicle on the test track for receiving the location signals as the receiver passes by the beacons;

a computer in communication with the receiver for receiving position signals therefrom; and

a flight recorder for recording vehicle parameters, the flight recorder being in communication with the computer for receiving position signals therefrom and correlating the position signals with the vehicle parameters over time, the computer being programmed to output position signals to the flight recorder in accordance with the communication protocol of the flight recorder.

2. The system of claim 1, wherein for each beacon, the microprocessor keys the transmitter to effect transmission of the position signals in lieu of a modem.

3. The system of claim 1, wherein each beacon further comprises a battery connected to the transmitter and the microprocessor for energizing the battery and microprocessor.

4. The system of claim 3, wherein each beacon is associated with at least one solar cell for charging the battery.

5. The system of claim 4, wherein each beacon further comprises a temperature sensor generating a temperature signal and a battery voltage sensor generating a battery voltage signal, the temperature signal and the battery voltage signal being sent to the microprocessor for transmission thereof in the position signal.

6. The system of claim 5, wherein the position signals from each receiver are sent to a low pass filter and then to a discriminator, prior to being sent to the computer.

7. The system of claim 6, wherein each position signal includes plural beacon address bytes, and a position signal is not sent by the computer to the flight recorder when one address byte differs from another address byte in the position signal.

8. The system of claim 7, wherein each position signal includes a transmitted check sum, and wherein the computer determines a received check sum based on the position signal, and the computer does not send the position signal to the flight recorder when the transmitted check sum does not equal the received check sum.

9. In a vehicle test system, a plurality of position beacon assemblies disposed along a predetermined route for generating respective position signals, each position signal being representative of the beacon assembly that transmitted it, each position beacon assembly comprising:

a transmitter;

a well casing being at least partially buried, the well casing being formed with an open top end for receiving the transmitter therethrough; and

a closure selectively engageable with the well casing for covering the top end.

10. The system of claim 9, wherein each beacon assembly further comprises:

a microprocessor for controlling the transmitter.

11. The system of claim 10, wherein for each beacon assembly, the microprocessor keys the transmitter to effect transmission of position signals in lieu of a modem.

12. The system of claim 10, wherein each beacon assembly further comprises a battery connected to the transmitter and the microprocessor for energizing the battery and microprocessor.

13. The system of claim 12, wherein each beacon assembly is associated with at least one solar cell for charging the battery.

14. The system of claim 13, wherein each beacon further comprises a temperature sensor generating a temperature signal and a battery voltage sensor generating a battery voltage signal, the temperature signal and the battery voltage signal being sent to the microprocessor for transmission thereof in the position signal.

16. The computer program device medium of claim 14, wherein the position signal includes start of message and end of message bytes.

15. A computer program device medium comprising:

a computer program storage device readable by a digital processing system; and

a means on the program storage device and embodying logic means recognizable by the digital processing system for performing method steps for generating position signals representative of a beacon and the temperature thereof, comprising;

logic means for determining whether the temperature is outside of a temperature range;

logic means for updating the temperature range when the temperature is outside the range; and

logic means for generating a position signal representative of the temperature, the temperature range, and the logical address of the beacon.

17. The computer program device medium of claim 15, wherein the logic means for generating generates plural address bytes, each address byte being identical to the other address bytes in the position signal.

18. A computer program device medium comprising:

a computer program storage device readable by a digital processing system; and

a means on the program storage device and embodying logic means recognizable by the digital processing system for performing method steps for sending, to a vehicle flight recorder, received position signals including plural transmitter beacon address bytes and at least one transmitted check sum, comprising;

logic means for determining when a complete position signal is received;

logic means for determining a received check sum based on the position signal;

logic means for determining whether the value of any beacon address byte is different from the value of any other beacon address byte in the position signal; and

logic means for sending the position signal to the flight recorder only when the received check sum equals the transmitted check sum and when no beacon address byte value is different from any other beacon address byte value.

20. The system of claim 18, wherein each receiving system further comprises:

a low pass filter for receiving an output of the receiver; and

a discriminator for receiving an output of the low pass filter, the computer receiving an output of the discriminator.

19. In a vehicle test system, a plurality of vehicle receiving systems positionable in respective vehicles for receiving, as each vehicle traverses a test track, position signals from stationary beacons juxtaposed with the test track, each receiving system comprising:

a receiver for receiving the position signals,

a flight recorder for recording vehicle data over time as the vehicle traverses the test track;

a computer for receiving position signals from the receiver, the computer generating an output signal representative of the position signals, the computer formatting the output signal in accordance with the communication protocol of the flight receiver, the computer including

logic means for determining when a complete position signal is received;

logic means for determining a received check sum based on the position signal;

logic means for determining whether the value of any beacon address byte is different from the value of any other beacon address byte in the position signal; and

logic means for sending the position signal to the flight recorder only when the received check sum equals the transmitted check sum and when no beacon address byte value is different from any other beacon address byte value.