Patent ID: 8109739
Filing Date: 2012-02-07
Classification: F02M,F04B

Abstract:
1. A dosing pump for a liquid additive in fuel of a heavy fuel engine, said pump comprising: a piston; a cylinder; an actuator for moving the piston axially in the cylinder, wherein the actuator is a high resolution linear actuator comprising a motor driven by a controller, a manifold, and a low friction dish-shaped seal having a peripheral portion forming a seal between the cylinder and the manifold in a fully extended position of the piston, said dish-shaped seal further having a top portion attached to the piston and moving with the piston such that said top portion of the seal is compressed against the manifold in said fully extended position of the piston, wherein the shape of the seal is configured to minimize non-linearity of the volume dosed as a function of movement of the piston, and wherein the controller is configured to drive the motor so as to remove a remaining non-linearity of the volume dosed as a function of movement of the piston.