Cargo sensing system and method

• US 6,437,702 B1
• Filed: 04/14/2000
• Issued: 08/20/2002
• Est. Priority Date: 04/14/2000
• Status: Expired due to Term

• Current Assignee: Omnitracs LLC (Solera Holdings Incorporated)
• Original Assignee: Qualcomm, Inc.
• Inventors: Ragland, Richard, Pedersen, Charles, Stillinger, David
• Primary Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US09/549,818
• Time in Patent Office: 858 Days
• Field of Search: 340/686.1, 340/686.6, 340/425.5, 340/566, 340/903, 340/943, 367/93, 367/94, 180/167, 180/169, 180/290
• US Class Current: 340/686.1
• CPC Class Codes: G01S 15/04 Systems determining presence of a target
• CPC Class Codes: G01S 15/88 Sonar systems specially adapted for specific applications seismic or acoustic prospecting or detecting G01V1/00
• CPC Class Codes: G01S 7/003 Transmission of data between radar, sonar or lidar systems and remote stations

Abstract

A method and apparatus for determining whether cargo is present in a freight car. The freight car has a proximal (“rear”) end with a loading door and opposing, distal (“front”) end. One or more transmitters and receivers are mounted inside the freight car at the front end, toward the car'"'"'s ceiling. The transmitters/receivers are operated by a controller, which also functions to analyze data from the transmitters/receivers and transmit related reports to a remote monitoring site. During a prescribed time period, a transmitter generates an ultrasonic signal pattern with a coverage area of prescribed radius that terminates before reaching the loading door. During the time period of transmission, or slightly later to account for signal reflection time, the controller operates the receiver to detect reflected signals originating from the transmitter. Then, the controller transmits a report of whether cargo is present in the freight car, based on whether any reflected signals were received.

Claims

1. A method for reporting whether cargo is present in a freight car having a proximal end with a loading door and also having an opposing, distal end, the method comprising operations of:

mounting at least one ultrasonic transmitter and at least one ultrasonic receiver inside the freight car at the distal end;

operating the transmitter to generate an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door;

operating the receiver to detect reflected ultrasonic signals of similar character as the signals generated by the transmitter;

reporting whether cargo is present in the freight car by transmitting a representative output signal, comprising;

if the receiver detects a reflected signal, reporting that the freight car is full;

if the receiver does not detect a reflected signal, reporting that the freight car is empty.

2. The method of claim 1, the operation of generating an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door comprising:

ignoring reflected ultrasonic signals that arrive more than a prescribed time after their transmission.

3. The method of claim 1, the operation of generating an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door comprising:

utilizing a transmit cone of prescribed configuration to shape the coverage area.

4. The method of claim 1, the operations utilizing a transmitter including a sonic cone and a sound-producing element substantially flush with the cone.

5. The method of claim 1, the mounting operation comprising affixing the transmitter to a wall inside the freight car such that the transmitter has a down angle of about thirteen degrees.

6. The method of claim 1, where:

the mounting operation installs first and second transmitters inside the freight car at the distal end;

the operations further comprise;

operating the second transmitter to generate a second ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reading a floor of the car; and

operating the receiver to detect reflected ultrasonic signals of similar character as the signals generated by the second transmitter; and

the operation of reporting whether cargo is present in the freight car comprising;

if the receiver detects a reflected signal from at least one of the transmitters, reporting that the freight car is full;

if the receiver does not detect a reflected signal, reporting that the freight car is empty.

7. The method of claim 6, the mounting operation affixing the second transmitter to a wall inside the freight car such that the second transmitter has a down angle of about forty five degrees.

8. A signal-bearing medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform a method for reporting whether cargo is present in a freight car having a proximal end with a loading door and also having an opposing, distal end, the method comprising operations of:

operating an ultrasonic transmitter mounted at the proximal end to generate an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door;

operating an ultrasonic receiver mounted at the proximal end to detect reflected sonic signals of similar character as the signals generated by the transmitter;

reporting whether cargo is present in the freight car by transmitting a representative output signal, comprising;

if the receiver detects a reflected signal, reporting that the freight car is full;

if the receiver does not detect a;

reflected signal, reporting that the freight car is empty.

9. A logic circuit of multiple interconnected electrically conductive elements configured to perform operations to report whether cargo is present in a freight car having a proximal end with a loading door and also having an opposing, distal end, the method comprising operations of:

operating an ultrasonic transmitter mounted at the proximal end to generate an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reading the loading door;

operating an ultrasonic receiver mounted at the proximal end to detect reflected sonic signals of similar character as the signals generated by the transmitter;

reporting whether cargo is present in the freight car by transmitting a representative output signal, comprising;

if the receiver detects a reflected signal, reporting that the freight car is full;

if the receiver does not detect a reflected signal, reporting that the freight car is empty.

10. An on-site cargo sensing and reporting apparatus, comprising:

at least one ultrasonic transmitter;

at least one ultrasonic receiver;

an antenna;

a controller coupled to the sonic transmitter, receiver, and antenna, programmed to perform operations to report whether cargo is present in a freight car, the freight car having a proximal end with a loading door and also having an opposing, distal end, the transmitter and receiver mounted thereto, the operations comprising;

operating the transmitter to generate an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door; and

operating the receiver to detect reflected sonic signals of similar character as the signals generated by the transmitter;

reporting whether cargo is present in the freight car by transmitting a representative output signal, comprising;

if the receiver detects a reflected signal, reporting that the freight car is full;

if the receiver does not detect a reflected signal, reporting that the freight car is empty.

11. The apparatus of claim 10, the controller being programmed such that the operation of generating an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching the loading door comprises:

ignoring reflected ultrasonic signals that arrive more than a prescribed time after their transmission.

12. The apparatus of claim 10, where the transmitter includes a transmit cone of prescribed configuration to provide a coverage area of a predetermined shape.

13. The apparatus of claim 10, the transmitter including a cone and a sound-producing element substantially flush with the cone.

14. The apparatus of claim 10, the transmitter being mounted inside the distal end of the freight car with a down angle of about thirteen degrees.

15. The apparatus of claim 10, where:

the transmitter includes first and second transmitters;

the controller is further programmed to perform operations comprising;

operating the second transmitter to generate a second ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reaching a floor of the car; and

;

operating the receiver to detect reflected ultrasonic signals of similar character as the signals generated by the second transmitter; and

the controller is programmed such that the operation of reporting whether cargo is present in the freight car comprises;

if the receiver detects a reflected signal from at least one of the transmitters, reporting that the freight car is full;

if the receiver does not detect a reflected signal, reporting that the freight car is empty.

16. The apparatus of claim 15, the second transmitter being mounted inside the distal end of the freight car with a down angle of about forty five degrees.

17. An on-site cargo sensing and reporting apparatus, comprising:

first means for transmitting ultrasonic signals;

second means for receiving ultrasonic signals;

third means for exchanging electromagnetic signals with a remote site;

controller means, coupled to the first, second, and third means, for reporting whether cargo is present in a freight car having a proximal end with a loading door and also having an opposing, distal end with the transmitter and receiver mounted thereto, by;

operating the first means to generate an ultrasonic signal pattern having a coverage area with a prescribed radius that terminates before reading the loading door; and

operating the second means to detect reflected ultrasonic signals of similar character as the signals generated by the first means;

reporting whether cargo is present in the freight car by transmitting a representative output signal via the third means, comprising;

if the second means detects a reflected signal, reporting that the freight car is full;

if the second means does not detect a reflected signal, reporting that the freight car is empty.