초록 ▼

An on-board evaporative emission leak detection system has a module for detecting 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 communicate

An on-board evaporative emission leak detection system has a module for detecting 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.

대표청구항 ▼

[ What is claimed is:] [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 selecti

[ What is claimed is:] [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; andan 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.