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Vapor leak detection system having a shared electromagnet coil for operating both pump and vent valve

  • US 5,967,124 A
  • Filed: 04/24/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 10/31/1997
  • Status: Expired due to Term
First Claim
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1. An on-board evaporative emission leak detection system for detecting leakage from an evaporative emission space of a fuel system of an automotive vehicle comprising:

  • a pump for pumping gaseous fluid with respect to an evaporative emission space;

    a vent valve that is selectively operable to a first state that vents the evaporative emission space to atmosphere and to a second state that does not vent the evaporative emission space to atmosphere; and

    an electromechanical actuator for operating both the pump and the vent valve comprising, an electric device for receiving an electric control signal having a first component for controlling operation of the pump and a second component for controlling operation of the vent valve, a first electromechanical coupling operatively coupling the device with the pump such that the pump operation is controlled by the first component of the electric control signal, and a second electromechanical coupling operatively coupling the device with the vent valve such that the vent valve operation is controlled by the second component of the electric control signal.

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