Sensor communication control considering EMC compliance for restraint control module

Patent metadata

Field	Value
Publication number	US-10604095-B2
Application number	US-201815940547-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 29, 2018
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A restraint control module is configured to communicate a sync pulse to a sensor. The control module includes a first sync pulse driver and a second sync pulse driver. The first sync pulse driver is connected to a first signal line and the second sync pulse driver connected to a second signal line. The first and second sync pulse drivers being configured to generate a differential sync pulse signal across the first signal line and second signal line using a first signal on the first signal line and a second signal on the second signal line.

First claim

The invention claimed is:

1. A restraint control module configured to communicate a sync pulse to a sensor having PSI5 timing compliance, the module comprising:
a first sync pulse driver connected to a first signal line; and
a second sync pulse driver connected to a second signal line, the first and second sync pulse drivers are synchronized to generate a first signal on the first signal line and second signal on the second signal line that form a single sync pulse across the first signal line and second signal line.

2. The restraint control module according to claim 1 , wherein the first signal and second signal form a differential signal that floats relative to ground.

3. The restraint control module according to claim 2 , wherein the first signal and second signal are direct current (DC) biased.

4. The restraint control module according to claim 3 , wherein the first signal is symmetrical with the second signal.

5. A method for communicating a sync pulse to a sensor, the method comprising:
providing a first driver;
providing a second driver;
generating a first signal with the first driver; and
generating a second signal with the second driver, wherein the first and second signal combine to generate an effective sync pulse according to PSI5 specifications.

6. The method according to claim 5 , wherein the first signal has positive initial slope and negative second slope; and wherein the second signal has negative initial slope and positive second slope that are symmetrical with the first signal.

7. A system for a restraint control module configured to communicate a sync pulse to a sensor, the system comprising:
a first sync pulse driver connected to a first signal line; and
a second sync pulse driver connected to a second signal line, the first and second sync pulse drivers being configured to generate a differential sync pulse signal across the first signal line and second signal line, using a first signal on the first signal line and a second signal on the second signal line;
wherein first signal and second signal sum to generate a combined pulse signal that matches PSI5 specifications.

8. The system according to claim 7 , wherein the first signal is floating relative to ground.

9. The system according to claim 8 , wherein the second signal is floating relative to ground.

10. The system according to claim 7 , wherein the first signal is direct current (DC) biased.

11. The system according to claim 10 , wherein the second signal is DC biased.

12. The system according to claim 7 , wherein the first line and the second line are a wire twisted pair.

13. The system according to claim 7 , wherein the first line and the second line have a balanced output impedance.

14. The system according to claim 7 , wherein the first signal is symmetrical with the second signal.

15. The system according to claim 7 , wherein the first signal has a same rise time as the second signal.

16. The system according to claim 7 , wherein the first signal has a same fall time as the second signal.

17. The system according to claim 7 , wherein the first signal has an opposite polarity as the second signal.

18. The system according to claim 7 , wherein the first signal has positive initial slope and negative second slope.

19. The system according to claim 7 , wherein the second signal has negative initial slope and positive second slope.

Assignees

• Autoliv Asp Inc
• Veoneer Us Inc

Inventors

• Colarossi Vincent
• Kowalczyk Peter

Classifications

• B60R21/01 Primary

  Electrical circuits for triggering {passive} safety arrangements, {e.g. airbags, safety belt tighteners,} in case of vehicle accidents or impending vehicle accidents {(electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343)} · CPC title

• G06F13/4072

  Drivers or receivers (G06F13/4086 takes precedence; for multistate logic circuits H03K19/0002) · CPC title

• H04L25/0272

  Arrangements for coupling to multiple lines, e.g. for differential transmission · CPC title

• B60R2021/01102

  Transmission method · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title