Acceleration sensing of fast roll and slow roll for vehicle

Patent metadata

Field	Value
Publication number	US-2017166151-A1
Application number	US-201514969873-A
Country	US
Kind code	A1
Filing date	Dec 15, 2015
Priority date	Dec 15, 2015
Publication date	Jun 15, 2017
Grant date	—

Abstract

A method and system for operating restraint devices in a vehicle during a fast roll event or a slow roll event includes a lateral acceleration sensor and an angular rate sensor. When the angular rate and a vertical acceleration of the vehicle predict a vehicle rollover, the system integrates the lateral acceleration from the lateral acceleration sensor to obtain a roll rate velocity. When the lateral acceleration is greater than a fast lateral acceleration threshold and the roll rate velocity is greater than a fast roll rate velocity threshold, the system provides a fast roll event output. When the lateral acceleration is less than the fast lateral acceleration threshold and greater than a slow lateral acceleration threshold while the roll rate velocity is greater than a slow roll rate velocity threshold, the system provides a slow roll event output. The system operates restraint devices based on the roll event.

First claim

1 . A method of operating at least one restraint device in a vehicle during a fast roll event or a slow roll event, the method comprising:
sensing a lateral acceleration of the vehicle; sensing a vertical acceleration of the vehicle; sensing an angular rate of the vehicle; integrating the lateral acceleration to obtain a roll rate velocity; predicting vehicle rollover from the angular rate and the vertical acceleration; when vehicle rollover is predicted, and
when the lateral acceleration is greater than a fast lateral acceleration threshold and the roll rate velocity is greater than a fast roll rate velocity threshold, setting a fast roll event output,
when the lateral acceleration is less than the fast lateral acceleration threshold and greater than a slow lateral acceleration threshold, and the roll rate velocity is greater than a slow roll rate velocity threshold, setting a slow roll event output, and
operating the restraint device of the vehicle in response to one of the fast roll event output and the slow roll event output.

2 . The method according to claim 1 , wherein operating the at least one restraint device in response to the fast roll event output includes deploying a side airbag, deploying a side airbag inflatable curtain and operating a seat belt pretensioner.

3 . The method according to claim 2 , wherein operating the restraint device in response to the slow roll event includes operating a seat belt pretensioner.

4 . The method according to claim 3 , providing a plausibility error when the lateral acceleration and the roll rate velocity do not result in either the fast roll event output or the slow roll event output and vehicle rollover is predicted.

5 . The method according to claim 3 , wherein operating the at least one restraint device in response to the slow roll event output is limited to operating the seat belt pretensioner.

6 . The method according to claim 3 , wherein the slow roll event is a soil-tripped rollover event and the fast roll event is a curb-tripped rollover event, and
wherein the sensing of the lateral acceleration includes determining the lateral acceleration from the slope of the roll rate velocity.

7 . A control system for at least one restraint device in a vehicle, the system comprising:
an angular rate sensor for providing an angular rate of the vehicle; a vertical acceleration sensor for providing vertical acceleration of the vehicle; a lateral acceleration sensor for providing a lateral acceleration of the vehicle; and an electronic controller including a processor and a memory, the processor configured to:
predict vehicle rollover based on the angular rate and the vertical acceleration,
integrate the lateral acceleration to determine a roll rate velocity,
when vehicle rollover is predicted, and
when the lateral acceleration is greater than a fast lateral acceleration threshold and the roll rate velocity is greater than a fast roll rate velocity threshold, provide a fast roll event output, and
when the lateral acceleration is less than the fast lateral acceleration threshold and greater than a slow lateral acceleration threshold, and the roll rate velocity is greater than a slow roll rate velocity threshold, provide a slow roll event output, and

when vehicle rollover is predicted, operating the at least one restraint device in response to one of the fast roll event output and the slow roll event output.

8 . The control system according to claim 7 , the at least one restraint device including
an inflatable side airbag; a side airbag inflatable curtain; a side airbag and inflatable curtain controller; and a seat belt pretensioner, wherein when vehicle rollover is predicted, operating the at least one restraint device in response to the fast roll event output includes deployment of the side airbag and deployment of the side airbag inflatable curtain by the side airbag and inflatable curtain controller, and operating of the seat belt pretensioner.

9 . The control system according to claim 7 , wherein the electronic controller is configured to,
when vehicle rollover is predicted, operating the at least one restraint device consists of operating a seat belt pretensioner in response to the slow roll event output without deploying the side airbag or the side airbag inflatable curtain.

10 . The control system according to claim 9 , wherein the processor is configured to determine a plausibility error when the lateral acceleration and the roll rate velocity do not result in either the fast roll event output or the slow roll event output.

11 . The control system according to claim 9 , wherein the slow roll event output corresponds to a soil-tripped rollover event and the fast roll event output corresponds to a curb-tripped rollover event.

12 . A method of operating at least one restraint device in a vehicle during a fast roll event or a slow roll event, the method comprising:
sensing an angular rate of the vehicle with an angular rate sensor; sensing a vertical acceleration of the vehicle with a vertical acceleration sensor; sensing a lateral acceleration of the vehicle with a lateral acceleration sensor; integrating the lateral acceleration to obtain a roll rate velocity; predicting vehicle rollover from the angular rate and the vertical acceleration; when the lateral acceleration is greater than a fast lateral acceleration threshold and the roll rate velocity is greater than a fast roll rate velocity threshold, providing a fast roll event output; when the lateral acceleration is less than the fast lateral acceleration threshold and greater than a slow lateral acceleration threshold, and the roll rate velocity is greater than a slow roll rate velocity threshold, providing a slow roll event output; and when vehicle rollover is predicted, operating the at least one restraint device in response to either the fast roll event or the slow roll event.

13 . The method according to claim 12 , wherein operating the at least one restraint device in response to the slow roll event output is limited to operating a seat belt pretensioner.

14 . The method according to claim 12 , wherein operating the at least one restraint device in response to the fast roll event output includes operating a seat belt pretensioner, deploying a side airbag and deploying a side airbag inflatable curtain.

15 . The method according to claim 12 , wherein the slow roll event is a soil-tripped rollover event and the fast roll event is a curb-tripped rollover event.

16 . The method according to claim 12 , providing a plausibility error when the lateral acceleration and the roll rate velocity do not result in either the fast roll event or the slow roll event, and vehicle rollover is predicted.

17 . The method according to claim 12 , wherein the sensing of the lateral acceleration includes determining the lateral acceleration from a slope of the roll rate velocity.

Assignees

• Bosch Gmbh Robert

Inventors

• Gergely Treplan
• Sagi Attila
• Laumann Markus

Classifications

• B60R2021/01325

  Vertical acceleration · CPC title

• B60R2021/0018

  Roll-over · CPC title

• B60R2021/01272

  Belt tensioners · CPC title

• B60R2021/01034

  Controlling a plurality of restraint devices · CPC title

• B60R21/0132 Primary

  responsive to vehicle motion parameters {, e.g. to vehicle longitudinal or transversal deceleration or speed value} · CPC title