Control unit and acceleration sensor system

• US 7,653,468 B2
• Filed: 07/22/2004
• Issued: 01/26/2010
• Est. Priority Date: 10/31/2003
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Frese, Volker, Wellhoefer, Matthias
• Primary Examiner(s): Black; Thomas G
• Assistant Examiner(s): Olsen; Lin B
• Application Number:
  US10/577,906
• Publication Number:
  US 20070079655A1
• Time in Patent Office: 2,014 Days
• Field of Search: 701/46, 701/47, 701/35
• US Class Current: 701/46
• CPC Class Codes: B60R 2021/01027 Safing sensors
• CPC Class Codes: B60R 2021/0119 Plausibility check
• CPC Class Codes: B60R 21/013 including means for detecting collisions, impending collisions or roll-over
• CPC Class Codes: B60R 21/0133 by integrating the amplitude of the input signal
• CPC Class Codes: B60R 21/01336 using filtering

Abstract

Described is a control unit and an acceleration sensor system, the control unit having an electronic safety switch which, as a function of a signal of an acceleration sensor system, releases output stages for actuating passenger protection means independently of a processor and the processor actuates the output stages as a function of the signal. The safety switch analyzes an integrated acceleration signal.

Claims

1. A control unit for actuating a passenger protection arrangement, comprising:

a processor; and

an electronic safety switch that, as a function of a signal of an acceleration sensor system, enables an output stage to be actuated by the processor, the enabling occurring independently of the processor, the processor actuating the output stage as a function of the signal, wherein the safety switch analyzes an integrated acceleration signal as the signal of the acceleration sensor system, wherein the acceleration sensor system includes an integrator for outputting the integrated acceleration signal, the integrator configured to generate the integrated acceleration signal independently of the processor.

2. The control unit as recited in claim 1, further comprising:

a high pass filter for filtering the integrated acceleration signal.

3. The control unit as recited in claim 1, wherein the safety switch executes watchdog functions for the processor.

4. The control unit as recited in claim 1, wherein the processor analyzes the integrated acceleration signal in parallel with the electronic safety switch, which performs a plausibility check on a decision by the processor to actuate the output stage as a function of the integrated acceleration signal, the electronic safety switch disabling the output stage from being actuated by the processor when the plausibility check fails.

5. The control unit as recited in claim 4, wherein the electronic safety switch utilizes a different analysis technique from that of the processor in analyzing the integrated acceleration signal.

6. The control unit as recited in claim 5, wherein the analysis technique utilized by the electronic safety switch includes comparisons to fixed threshold values.