Sensor arrangement for an integrated pressure management apparatus

• US 6,505,514 B1
• Filed: 04/05/2000
• Issued: 01/14/2003
• Est. Priority Date: 11/19/1999
• Status: Expired due to Fees

• Current Assignee: Siemens Canada Limited (Siemens AG)
• Original Assignee: Siemens Canada Limited (Siemens AG)
• Inventors: Perry, Paul D.
• Primary Examiner(s): Oen, William
• Application Number:
  US09/543,741
• Time in Patent Office: 1,014 Days
• Field of Search: 732/90.R, 732/91, 732/92, 732/93, 732/99, 733/00, 733/01, 733/02, 733/03, 737/14, 737/06, 737/09, 737/44, 737/45
• US Class Current: 73/714
• CPC Class Codes: F02M 25/0809 Judging failure of purge control system
• CPC Class Codes: F02M 25/0836 Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
• CPC Class Codes: F02M 25/0854 Details of the absorption canister
• CPC Class Codes: H01H 35/2614 by varying the bias on the pressure sensitive element
• CPC Class Codes: H01H 35/34 actuated by diaphragm

Abstract

A sensor arrangement for an integrated pressure management apparatus. The sensor arrangement includes a chamber having an interior volume that varies in response to fluid pressure in the chamber. The chamber includes a diaphragm displaceable between a first configuration corresponding to fluid pressure above a certain pressure level and to a second configuration corresponding to fluid pressure below the certain pressure level. A resilient element biases the diaphragm toward the first configuration and a switch is actuated by the diaphragm in the second configuration.

Claims

1. A sensor arrangement for an integrated pressure management apparatus, the sensor arrangement comprising:

a chamber having an interior volume varying in response to fluid pressure in the chamber, the chamber including a diaphragm displaceable between a first configuration in response to fluid pressure above a certain pressure level and a second configuration in response to fluid pressure below the certain pressure level; and

a switch disposed on the chamber and actuated by the diaphragm in the second configuration.

2. The sensor arrangement according to claim 1, wherein the switch signals displacement of the diaphragm in response to negative pressure below the certain pressure level in the chamber.

3. The sensor arrangement according to claim 1, wherein the switch is disposed within the chamber.

4. The sensor arrangement according to claim 1, further comprising:

a plurality of electrical connections fixed with respect to the chamber and electrically interconnected with the switch.

5. The sensor arrangement according to claim 1, further comprising:

a resilient element biasing the diaphragm toward the first configuration.

6. The sensor arrangement according to claims 5, further comprising:

an adjuster calibrating a biasing force of the resilient element.

7. The sensor arrangement according to claim 6, wherein the calibrated biasing force of the resilient element corresponds to the certain pressure level.

8. The sensor arrangement according to claim 5, wherein the resilient element includes a leaf spring.

9. The sensor arrangement according to claim 8, wherein the leaf spring includes a fixed end mounted with respect to the chamber and a free end engaging the diaphragm.

10. The sensor arrangement according to claim 9, further comprising:

an adjuster calibrating a biasing force of the first resilient element, the adjuster contiguously engaging the leaf spring between the fixed and free ends.

11. The sensor arrangement according to claim 8, wherein the leaf spring includes first and second ends secured with respect to the chamber, the leaf spring moving over-center between the first and second configurations of the diaphragm.

12. The sensor arrangement according to claim 11, further comprising:

an adjuster calibrating a biasing force of the leaf spring, the adjuster positionally adjusting the first end with respect to the chamber, and the second end being positionally fixed with respect to the chamber.

13. The sensor arrangement according to claim 11, wherein the switch includes a first electrical contact mounted on the resilient element and a second electrical contact mounted on the chamber.

14. The sensor arrangement according to claim 1, further comprising:

a printed circuit board in electrical communication with the switch, the printed circuit board being disposed within the chamber.