Stress-wave sensor module, stress-wave sensor, and method for detecting a vehicle collision event utilizing the stress-wave sensor

• US 8,011,253 B2
• Filed: 06/15/2009
• Issued: 09/06/2011
• Est. Priority Date: 06/15/2009
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG (Aptiv PLC)
• Original Assignee: Delphi Technologies, Inc. (Aptiv PLC)
• Inventors: Yeo, Kok Wee, Low, Yew Kwang, Yeo, Chee Keng, Leong, Daniel Woon
• Primary Examiner(s): NOORI, MAX H
• Application Number:
  US12/484,547
• Publication Number:
  US 20100313663A1
• Time in Patent Office: 813 Days
• Field of Search: 73 1201- 1214, 73760-860
• US Class Current: 73/767
• CPC Class Codes: B60R 21/0136 responsive to actual contact with an obstacle , e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle monitoring crash strength in combination with passenger seat detection B60R21/01558
• CPC Class Codes: G01L 1/2206 Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
• CPC Class Codes: G01L 5/0052 measuring forces due to impact G01L5/0061, G01L5/14 take precedence; impact testing of structures G01M7/08; impact testing of material G01N3/00

Abstract

A stress-wave sensor module, a stress-wave sensor, and a method for detecting a vehicle collision event utilizing the stress-wave sensor are provided. The stress-wave sensor has first and second support members and a diaphragm member coupled between the first and second support members. The stress-wave sensor further has first and second strain gauge sensors coupled to both the first support member and the diaphragm member. The first and second strain gauge sensors generate first and second signals, respectively, in response to the first and second strain gauge sensors detecting deflection of the diaphragm member due to stress waves propagating through the diaphragm member.

Claims

1. A stress-wave sensor, comprising:

first and second support members;

a diaphragm member coupled between the first and second support members; and

first and second strain gauge sensors coupled to both the first support member and the diaphragm member, the first and second strain gauge sensors generating first and second signals, respectively, in response to the first and second strain gauge sensors detecting deflection of the diaphragm member due to stress waves propagating through the diaphragm member, wherein the diaphragm member has first and second plate members, a first end of the first plate member coupled to the first support member, a first end of the second plate member coupled to a second end of the first plate member, the second plate member being disposed generally perpendicular to the first plate member, and a second end of the second plate member coupled to the second support member.

2. The stress-wave sensor of claim 1, further comprising a microprocessor receiving the first and second signals from the first and second strain gauge sensors, respectively, the microprocessor configured to generate a third signal when at least one of the first and second signals is greater than a threshold amplitude level indicating a vehicle collision event has occurred.

3. The stress-wave sensor of claim 1, wherein the first and second support members and the diaphragm member are constructed of an identical material.

4. The stress-wave sensor of claim 3, wherein the identical material is a metal alloy.

5. A stress-wave sensor, comprising:

first and second support members;

a diaphragm member coupled between the first and second support members; and

first and second strain gauge sensors coupled to both the first support member and the diaphragm member, the first and second strain gauge sensors generating first and second signals, respectively, in response to the first and second strain gauge sensors detecting deflection of the diaphragm member due to stress waves propagating through the diaphragm member, wherein the diaphragm member has first and second plate members, the second plate member being arcuate-shaped, a first end of the first plate member coupled to the first support member, a first end of the second plate member coupled to a second end of the first plate member, and a second end of the second plate member coupled to the second support member.

6. The stress-wave sensor of claim 5, further comprising a microprocessor receiving the first and second signals from the first and second strain gauge sensors, respectively, the microprocessor configured to generate a third signal when at least one of the first and second signals is greater than a threshold amplitude level indicating a vehicle collision event has occurred.

7. The stress-wave sensor of claim 5, wherein the first and second support members and the diaphragm member are constructed of an identical material.

8. The stress-wave sensor of claim 7, wherein the identical material is a metal alloy.

9. A method for detecting a vehicle collision event utilizing a stress-wave sensor, the stress-wave sensor having first and second support members, a diaphragm member, and first and second strain gauge sensors, the diaphragm member coupled between the first and second support members, the first and second strain gauge sensors coupled to both the first support member and the diaphragm member, the method comprising:

generating first and second signals utilizing the first and second strain gauge sensors, respectively, in response to the first and second strain gauge sensors detecting deflection of the diaphragm member due to stress waves propagating through the diaphragm member;

receiving the first and second signals at a microprocessor;

determining whether at least one of the first and second signals has an amplitude greater than a threshold amplitude level, utilizing the microprocessor; and

generating a third signal indicating the vehicle collision event has occurred if at least one of the first and second signals has an amplitude greater than the threshold amplitude level, utilizing the microprocessor.