Patent ID: 6460510
Filing Date: 2002-10-08
Classification: F02M,F04B,F05C,Y10T

Abstract:
A pump assembly for pressurizing oil used to actuate electronically controlled fuel injectors in a diesel engine having an electronic control module, the pump assembly including: a body adapted to be mounted on a diesel engine; a piston pump in the body, said pump including a piston passage, a piston in the piston passage, a mechanical drive mechanism to move the piston along pumping and return strokes in the piston passage, said piston passage and piston defining a variable volume pumping chamber having opposed ends, an oil inlet port in the body, an inlet passage extending from the inlet port to the pumping chamber through an inlet opening at one end of the pumping chamber, an outlet check valve at the other end of the pumping chamber, an oil outlet port in the body, a high pressure outlet passage extending from the outlet check valve to the outlet port, an inlet throttle valve in the inlet passage, the inlet throttle valve including a movable valve member to control the volume of oil flowed through the inlet passage and into the pumping chamber; and an inlet throttle valve regulator, the regulator including an electronic input device to receive a signal from a diesel engine electronic control module proportional to a desired pressure in the outlet passage, a pressure signal input connected to the outlet passage, and an operative connection with the valve member of the inlet throttle valve, wherein the inlet throttle valve regulator moves the valve member of the inlet throttle valve to increase the volume of oil flowed into the pumping chamber when the pressure of the oil in the outlet passage is less than the desired pressure of the oil in the outlet passage and to decrease the volume of oil flowed into the pumping chamber when the pressure of the oil in the outlet passage is greater than the desired pressure of the oil in the outlet passage.