Sensor for increasing signal response time

• US 6,386,023 B1
• Filed: 03/24/1999
• Issued: 05/14/2002
• Est. Priority Date: 03/24/1999
• Status: Expired due to Fees

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Barthel, Richard C., Sajna, Jeffrey L., Gardner, David J.
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US09/275,556
• Time in Patent Office: 1,147 Days
• Field of Search: 738/18--25, 738/626.21, 738/626.22, 738/626.32, 738/626.36, 738/626.37, 731/47, 731/46
• US Class Current: 73/146
• CPC Class Codes: H01H 13/18 adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
• CPC Class Codes: H01H 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 2201/036 Variable resistance
• CPC Class Codes: H03K 17/9625 using a force resistance transducer

Abstract

A sensor (210) for increasing signal time employs a resiliently deflectable member n(218) with a pressure sensitive signal element (216) and base member (222). The dampening effect of the elastic material provides a longer signal response time that allows sufficient time for a system to react without a need for additional signal conditioning circuitry. Sensor (10, 110) senses a selected path of movement for a moveable element (8) and establishes a signal indicative thereof. The limit sensor includes a resiliently deflectable member (18) for activating the signal at a predetermined station along the preselected path of movement and includes a base member (22) for supporting the resiliently deflectable member (18) and the pressure sensitive signal element (16). An actuator (20) receives the force (F) from the moveable element (8) and transfers the force (F) to the pressure sensitive signal element (16). In the preferred embodiment, the resiliently deflectable member (18) includes a leaf spring (18) positioned between the actuator (20) and the pressure sensitive signal element (16).

Claims

1. An improved limit sensor for a vehicle power sliding door assembly having an increased signal response time, comprising:

a housing;

an actuator disposed within said housing and being constructed to receive a force from a movable element of the vehicle power sliding door assembly, said actuator having a deflectable member with a selected resiliency; and

a pressure sensitive signal element situated within said housing against said deflectable member and being electrically responsive thereto, said pressure sensitive signal element receiving the force imparted from said deflectable member of said actuator and establishing a signal indicative thereof, said selected resiliency of said deflectable member producing a dampening effect for increasing a length of time for signal response for facilitating operation of the vehicle power sliding assembly by increasing signal response time.

2. A sensor as recited in claim 1, wherein said housing is joined to a base member, said base member supporting said pressure sensitive signal element, said housing surrounding said pressure sensitive signal element and having said deflectable member with said selected resiliency positioned on said pressure sensitive signal element.

3. A sensor as recited in claim 1, wherein said selected resiliency of said deflectable member comprises an elastic material having a compressibility constructed to produce the dampening effect.

4. A sensor as recited in claim 3, wherein said elastic material comprises a rubber material.

5. A sensor as recited in claim 4, wherein said rubber material forms said housing surrounding said pressure sensitive signal element.

6. A sensor as recited in claim 5, wherein an inner surface of said housing is positioned at a distance from said pressure sensitive signal element.

7. A sensor as recited in claim 6, wherein said inner surface further comprises a projection spaced from said pressure sensitive signal element.

8. A sensor as recited in claim 1, wherein said signal is a pulsed signal.

9. A sensor as recited in claim 8, wherein said selected resiliency of said deflectable material provides an increased duration in the pulsed signal.

10. A sensor as recited in claim 1, further comprising a housing formed of a rubber material, said housing having an inverted cup-like configuration with said pressure sensitive signal element, and said base member positioned therein.

11. A sensor as recited in claim 10, wherein said housing includes a rim extending radially inwardly about a perimeter of said base member.

12. A method for increasing signal response time for a limit sensor, comprising the steps of:

providing an actuator having a deflectable member with a selected resiliency, the deflectable member of the actuator being constructed to receive a force from a movable element;

providing a pressure sensitive signal element and positioning the pressure sensitive signal element at a selected location for receiving the force from the deflectable member of the actuator;

providing a base member for supporting the pressure sensitive signal element and the deflectable member of the actuator;

generating a signal with the pressure sensitive signal element substantially proportional to the force imparted from the deflectable member of the actuator on the pressure sensitive signal element;

producing a dampening effect following a release of the force with the selected resiliency of the deflectable member of the actuator; and

increasing a length of time for the signal with the dampening effect produced by the selected resiliency of the deflectable member of the actuator to allow sufficient time for detection of the signal from the limit sensor.

13. A method as recited in claim 12, further comprising the steps of transmitting the signal to a processor, and providing a control signal to a device responsive to the signal from said pressure sensitive signal element.

14. A method as recited in claim 12, further comprising the step of overmolding an elastic material for forming the actuator and the deflectable member with the selected resiliency on the pressure sensitive signal element and base member.

15. A method as recited in claim 13, wherein the producing step comprises the step of pulse stretching a pulsed voltage signal with the dampening effect of the deflectable member made of a rubber material.

16. A method as recited in claim 12, further comprising the step of positioning a housing on the pressure sensitive signal element and the deflectable member of the actuator on the base member.

17. A method as recited in claim 12, wherein the moveable element is a vehicle door.

18. A method as recited in claim 16, wherein the deflectable member with the selected resiliency is made from a rubber material and comprises the housing.

19. An improved limit sensor, comprising:

an actuator constructed to receive a force from a movable element, said actuator being positioned on a selected path of movement, said actuator having a deflectable member having a selected resiliency;

a pressure sensitive signal element operatively connected to said deflectable member of said actuator for receiving the force imparted therefrom and establishing a signal indicative thereof; and

a base member connected to said actuator and said pressure sensitive signal element for supporting said actuator, said deflectable member, and said pressure sensitive signal element,

said deflectable member having said selected resiliency being constructed to activate with the transfer of the force said pressure sensitive signal element at a predetermined station along the selected path of movement, said selected resiliency of said deflectable member producing a dampening effect as the force is released for increasing the signal response time for a time sufficient for detection of the signal.

20. A limit sensor as recited in claim 19, further comprising a housing joined to said base member, and said housing surrounding said pressure sensitive signal element.

21. A limit sensor as recited in claim 20, wherein said deflectable member comprises a leaf spring having a selected resiliency situated between said actuator and said pressure sensitive element.

22. A limit sensor as recited in claim 21, wherein said leaf spring is constructed of a nonconductive material and has a conductive portion of a predetermined size and location thereon.

23. A limit sensor as recited in claim 22, wherein said actuator comprises a lunger.

24. A limit sensor as recited in claim 21, wherein said actuator comprises a cantilever.

25. A limit sensor as recited in claim 24, wherein said cantilever comprises a portion of a cover constructed for attachment to said base member.

26. A limit sensor as recited in claim 21, wherein said leaf spring is constructed of a conductive material and includes a conductive portion situated at a selected location and having a predetermined size, said conductive portion being isolated with an insulator from said conductive material of said leaf spring.

27. A limit sensor as recited in claim 21, wherein said leaf spring is constructed of a conductive material.