Vapor leak detection module having a shared electromagnet coil f

Details Vapor leak detection module having a shared electromagnet coil f Vapor leak detection module having a shared electromagnet coil f

1998-04-24

1999-11-02

Larkin, Daniel S.

Measuring and testing

With fluid pressure

Leakage

73 497, 123520, F02M 3704, G01M 320

Patent

active

059748613

ABSTRACT:
A module for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. Interior space of the module's enclosure is communicated to atmosphere. A pump is disposed within space and has an inlet communicated to the interior space and a flow passage at its outlet to allow the pump to create pressure in the evaporative emission space suitable for performance of a leak test. A vent valve is disposed within space and is selectively operable to vent and not vent the flow passage to space. An electromagnet actuator has a single electric coil that operates both the pump and the vent valve by cantilever-mounted armatures responsive to electric control current in the coil having a first current component for controlling the pump and a second current component for controlling the vent valve.

REFERENCES:
patent: 5383437 (1995-01-01), Cook et al.
patent: 5495749 (1996-03-01), Dawson et al.
patent: 5499614 (1996-03-01), Busato et al.
patent: 5817925 (1998-10-01), Cook et al.

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