Patent ID: 6640834
Filing Date: 2003-11-04
Classification: F01L,F16K,Y10T

Abstract:
An electrohydraulic valve for controlling an internal combustion engine, said electrohydraulic control valve comprising:a tubular valve body having a longitudinal bore there through forming an outlet port at one end of the valve body, and having with a first port, a second port and an inlet port extending transversely through the body in communication with the longitudinal bore; a spool slidably received within the bore of the valve body and having an aperture extending from an end of the spool that is proximate to the one end of the valve body to a point proximate an opposite end of the spool, the spool including an notch in an exterior surface; a spring which biases the spool away from the one end of the valve body; and an actuator having a solenoid coil wound on an annular bobbin, a first pole piece extends into one end of the bobbin and has a first aperture, a second pole piece extends into another end of the bobbin and has a second aperture, the actuator further including a first bushing in the first aperture and a second bushing in the second aperture, each of the first and second bushings having a tubular body with a first end section that has a larger outer diameter than a second end section and wherein the second end section has a smaller inner diameter than the first end section, the actuator additionally having an armature is slidably received in the first and second bushings and engaging the spool; wherein, in response to forces from the spring and the armature, the spool moves into one of a first position where the second port is in fluid communication with the outlet port and the first port is in fluid communication via the notch with the inlet port, and a sec and position where the inlet port is in fluid communication via the notch with the second port and the aperture provides a fluid path between the first port and the outlet port.