Patent ID: 6016793
Filing Date: 2000-01-25
Classification: F02M

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, 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; andan 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.