VEHICULAR COMMUNICATIONS SYSTEM HAVING IMPROVED SERIAL COMMUNICATION

• US 20080037693A1
• Filed: 09/13/2007
• Published: 02/14/2008
• Est. Priority Date: 12/19/2003
• Status: Active Grant

• Current Assignee: Gentex Corporation
• Original Assignee: Gentex Corporation
• Inventors: Friend, Timothy, Andrus, Jeremy, Turnbull, Robert, Bechtel, Jon
• Granted Patent: US 7,920,601 B2
• Time in Patent Office: Days
• US Class Current: 375/359
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 25/493 by transition coding, i.e. the time-position or direction of a transition being encoded before transmission

Abstract

A communications system for controlling equipment associated with a vehicle, includes a micro-controller (604) and a digital serial communication link (621, 622, 662, 663) using a multiplexed timing signal and first data signal. A camera or image sensor (650) located in the vehicular component communicates with the micro-controller (604) via the digital serial communication link.

Claims

1. An apparatus, comprising:

an interface unit comprising a reference clock, the interface unit configured to transmit a first serial data stream multiplexed with the reference clock signal over a common transmission line; and

a remote unit configured to extract the multiplexed reference clock from the first serial data stream utilizing at least one first variable delay element, the remote unit utilizes the extracted multiplexed reference clock as a timing reference for receiving the first serial data stream.

2. An apparatus as in claim 1, wherein the remote unit utilizes the extracted multiplexed reference clock signal to synchronize a second serial data stream transmitted to the interface unit.

3. An apparatus as in claim 2, wherein the interface unit utilizes the reference clock to receive the second serial data stream from the remote unit.

4. An apparatus as in claim 3, wherein the interface unit comprises at least one second variable delay element to align the second serial data stream with the reference clock.

5. An apparatus as in claim 1, wherein the remote unit utilizes at least one third variable delay element to multiply the extracted multiplexed reference clock for local use.

6. An apparatus, comprising:

a remote unit configured to receive a first serial data stream and multiplexed reference clock, the remote unit comprising at least one variable delay element to extract the multiplexed reference clock from the first serial data stream, wherein the at least one variable delay element is periodically calibrated.

7. An apparatus as in claim 6, wherein the at least one variable delay element is used to generate a local reference clock comprising a frequency that is a fixed multiple of the extracted multiplexed reference clock.

8. An apparatus as in claim 6, wherein a special transmission line state is used to initiate calibration of the at least one variable delay element.

9. An apparatus as in claim 6, wherein a predetermined transmission line state pattern is used to initiate calibration of the at least one variable delay element.

10. An apparatus, comprising:

an interface unit comprising a reference clock, the interface unit configured to transmit a first serial data stream multiplexed with the reference clock signal over a common transmission line; and

a remote unit configured to receive a first serial data stream and multiplexed reference clock, the remote unit comprising at least one variable delay element to extract the multiplexed reference clock from the first serial data stream, wherein the at least one variable delay element is periodically calibrated.

11. An apparatus as in claim 10, wherein an interface unit is a micro-controller.

12. An apparatus as in claim 10, wherein the remote unit is an image sensor.

13. An apparatus as in claim 10, wherein the remote unit is a micro-controller.

14. An apparatus as in claim 10, wherein the interface unit is an image sensor.

15. An apparatus as in claim 10, wherein the remote unit is located in a vehicle.

16. An apparatus as in claim 10, wherein the remote unit is an exterior light control.

17. An apparatus as in claim 10, wherein the remote unit is a rear vision system.

18. An apparatus as in claim 10, wherein the remote unit is a moisture sensor.

19. An apparatus as in claim 10, wherein the remote unit is a windshield wiper control.

20. An apparatus as in claim 10, wherein, the remote unit is a defogger control.

21. An apparatus as in claim 10, wherein the remote unit is a lane departure warning.

22. An apparatus as in claim 10, wherein the remote unit is an information display.

23. An apparatus as in claim 10, wherein the remote unit is a windshield wiper control.

24. An apparatus as in claim 10, wherein the remote unit is a lane departure control.

25. An apparatus as in claim 10, wherein the remote unit is an adaptive cruise control.