Regulated linear purge solenoid valve
AssigneeSiemens Canada Limited
InventorsJohn Edward Cook, Murray F. Busato
Life of this patent
Estimating the term…
Abstract
A pressure regulator is associated with a solenoid-operated valve that is operated by a pulse waveform at a fundamental frequency substantially greater than the frequency response of the valve mechanism. This substantially attenuates solenoid pulsations and applies a predetermined pressure differential across the valve mechanism to accomplish improved flow control accuracy. The invention is especially advantageous for purging fuel vapor to an intake manifold of an internal combustion engine of an automotive vehicle.
Claims35
An electric-operated pressure-regulated fluid flow control valve comprising a valve mechanism that is positioned within a valve body by an electric control signal to control fluid flow through the valve body and that has a frequency response characteristic which renders the valve mechanism incapable of faithfully tracking the fundamental frequency of an electric control signal whose fundamental frequency is greater than a predetermined frequency that, when applied in control of the valve mechanism, positions the valve mechanism to a position corresponding to a most recent time average of the electric control signal free of any significant pulsing of the valve mechanism, and a pressure regulator comprising a flow path having an entrance through which fluid flow that has passed through the valve mechanism enters the pressure regulator flow path and an exit from which fluid flow that has entered the pressure regulator flow path exits the pressure regulator flow path, said pressure regulator comprising a pressure regulating mechanism that regulates the pressure at the entrance of the pressure regulator flow path to a pressure that is essentially independent of pressure at the exit of the pressure regulator flow path.
An electric-operated pressure-regulated fuel vapor purge valve for purging fuel vapor from a fuel tank to an intake manifold of an internal combustion engine comprising a valve mechanism that is positioned within a valve body by an electric control signal to control flow through the valve body and that has a frequency response characteristic which renders the valve mechanism incapable of faithfully tracking the fundamental frequency of an electric control signal whose fundamental frequency is greater than a predetermined frequency that, when applied in control of the valve mechanism, positions the valve mechanism to a position corresponding to a most recent time average of the electric control signal free of any significant pulsing of the valve mechanism, and a pressure regulator comprising a flow path having an entrance through which flow that has passed through the valve mechanism enters the pressure regulator flow path and an exit for communicating the pressure regulator flow path to an engine intake manifold, said pressure regulator comprising a pressure regulating mechanism that regulates the pressure at the entrance of the pressure regulator flow path to a pressure that is essentially independent of intake manifold vacuum.
Dependencies are inferred from the claim text.