Patent ID: 7287516

Claim:
A pump, comprising: a housing defining at least one pumping chamber; a plunger slidably disposed within the at least one pumping chamber and movable between a first and a second spaced apart end position to draw a fluid into the at least one pumping chamber and displace the fluid from the at least one pumping chamber; a metering valve disposed at an inlet of the at least one pumping chamber, the metering valve having a valve element movable to selectively meter fluid drawn into the at least one pumping chamber; and a controller in communication with the metering valve and configured to: receive an indication of a desired discharge characteristic; reference a first map stored in a memory of the controller to determine an inlet opening area corresponding to the desired discharge characteristic; reference a second map stored in the memory of the controller to determine a position of the metering valve corresponding to the determined inlet opening area; and send a control signal to the metering valve indicative of the determined position.