Granted Patent B2

US 7,813,856 · App. 11/866,473 · Granted Oct 12, 2010

Abstract

Claims (40)

1. A seatbelt monitoring system for use onboard a vehicle having a seat assembly including at least one seat and seatbelt, comprising:

a wireless seatbelt status detector, comprising:

a seatbelt latch sensor;

a first wireless transceiver; and

a controller coupled to the seatbelt latch sensor and to the first wireless transceiver, the controller configured to send a seatbelt latch signal via the first wireless transceiver when the seatbelt latch sensor indicates a change in latch status; and

a vehicle seatbelt status indicator, comprising:

a second wireless transceiver; and

a processor coupled to the second wireless transceiver, the processor configured to send a receipt signal to the wireless seatbelt status detector after receiving the seatbelt latch signal via the second wireless transceiver;

wherein the controller is further configured to: (i) re-send the seatbelt latch signal if the receipt signal is not received within a predetermined time period, and (ii) create an error log after a predetermined number of successive re-send attempts.

2. A seatbelt monitoring system according to claim 1 wherein the wireless seatbelt status detector further comprises a seat occupancy sensor coupled to the controller.

3. A seatbelt monitoring system according to claim 2 wherein the controller is further configured to send a seat occupancy signal via the first wireless transceiver when the seat occupancy sensor indicates a change in seat occupancy.

4. A seatbelt monitoring system according to claim 3 wherein the vehicle seatbelt status indicator further comprises an alert generator, and wherein the processor is configured to activate the alert generator when the seatbelt latch and seat occupancy signals indicate that the seatbelt is unlatched and that the seat is occupied, respectively.

5. A seatbelt monitoring system according to claim 4 wherein the wireless seatbelt status detector further comprises an alert generator, and wherein the controller is further configured to activate the alert generator after a predetermined number of successive re-send attempts.

6. A seatbelt monitoring system according to claim 5 wherein the seatbelt includes a seatbelt buckle, and wherein the alert generator of the wireless seatbelt status detector comprises a light emitting diode disposed on the seatbelt buckle.

7. A seatbelt monitoring system according to claim 1 wherein the processor is further configured to send an update request signal to the wireless seatbelt status detector.

8. A seatbelt monitoring system according to claim 7 wherein vehicle seatbelt status indicator further comprises an ignition sensor, and wherein the processor is configured to send the update request signal when the ignition sensor indicates that the vehicle's ignition has been activated.

9. A seatbelt monitoring system according to claim 7 wherein the processor is further configured to re-send the update request signal if a response signal is not received from the wireless seatbelt status detector within a predetermined time period.

10. A seatbelt monitoring system according to claim 9 wherein vehicle seatbelt status indicator further comprises an alert generator, and wherein the processor is further configured to activate the alert generator after a predetermined number of successive re-send attempts.

11. A seatbelt monitoring system for use onboard a vehicle having a seat assembly including at least one seat and seatbelt having a latch, comprising:

a wireless seatbelt status detector, comprising:

an alert generator;

a seatbelt latch sensor configured to monitor latch status;

a seat occupancy sensor configured to monitor seat occupancy;

a first wireless transceiver; and

a controller coupled to the alert generator, to the seatbelt latch sensor, to the seat occupancy sensor, and the to the first wireless transceiver, the controller configured to send a wireless message indicative of seatbelt latch status and of seat occupancy; and

a vehicle seatbelt status indicator, comprising:

a second wireless transceiver;

an alert generator; and

a processor coupled to the second wireless transceiver and to the alert generator, the processor configured to activate the alert generator when the wireless message indicates that the seat is occupied and that the seatbelt latch is unfastened;

wherein the controller is further configured to: (i) re-send the seatbelt latch signal if the receipt signal is not received within a predetermined time period, and (ii) activate the alert generator after a predetermined number of successive re-send attempts.

12. A seatbelt monitoring system according to claim 11 wherein the processor is further configured to send a receipt signal after receiving the wireless message.

13. A method according for wirelessly monitoring the status of a seatbelt associated with a seat in a vehicle, comprising:

sending at least one wireless signal indicative of seatbelt latch status and of seat occupancy;

receiving the wireless signal;

generating an alert if the wireless signal indicates that the seatbelt latch is unfastened and that the seat is occupied;

sending a receipt signal indicating that the wireless signal has been received;

re-sending the wireless signal if the receipt is not received within a predetermined time period;

monitoring the number of successive re-send attempts; and

creating an error log if the number of successive re-send attempts exceeds a threshold value.

14. A method according to claim 13 further comprising generating an alert if the number of successive re-send attempts exceeds the threshold value.

Assignments (12)