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Leak detection module having electric-operated toggle levers for pump and valve

  • US 6,016,793 A
  • Filed: 06/30/1998
  • Issued: 01/25/2000
  • Est. Priority Date: 02/25/1998
  • Status: Expired due to Term
First Claim
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1. 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, the module comprising:

  • an enclosure comprising an interior space adapted to be communicated to atmosphere;

    a pump disposed within the interior space comprising a pumping chamber having an inlet in communication with the interior space and a flow passage for communicating the pumping chamber with an evaporative emission space to allow the evaporative emission space to be pressurized by the pump;

    a vent valve that is disposed within the interior space and is selectively operable to a first state that vents the flow passage to the interior space to thereby vent the evaporative emission space to atmosphere and to a second state that does not vent the flow passage to the interior space; and

    an electromechanical actuator disposed within the interior space for operating both the pump and the vent valve to perform a leak test on the evaporative emission space;

    a first electromagnetic coupling for operatively coupling the actuator with the pump;

    a second electromagnetic coupling for operatively coupling the actuator with the valve;

    the actuator comprising an electromagnet coil disposed about an axis, the first coupling comprising a first magnetically responsive element that is disposed proximate an axial end of the coil to be displaced with a principal component of motion parallel to the coil axis, and the second coupling comprising a second magnetically responsive element that is disposed proximate an axial end of the coil to be displaced with a principal component of motion parallel to the coil axis.

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