Abstract: A solenoid valve assembly that controls the flow of fluids, such as those in electric, internal combustion engine and/or hybrid vehicles. The solenoid valve assembly may include a casing, a bobbin, a coil, a body, a pole piece, an armature, a spring, a primary seal, a secondary seal, and an electrical connection. In a closed state, the spring pushes the armature downwards against the body, thereby closing the primary seal. In an open state, electrical current is provided to the coil, which creates an electromagnetic field and magnetic flux that magnetically attracts and pulls the armature upwards to the pole piece, against the spring force, such that the primary seal is opened. A low clearance, extended length secondary seal is used in conjunction with the primary seal. The solenoid valve assembly may employ a peak-and-hold technique to maintain the primary seal in the open state, yet do so while drawing a minimum amount of electrical current.

Abstract: A solenoid control valve for use in actuation of a manual hydraulic clutch in a vehicle. The solenoid control valve has an electronically operated solenoid with armature and actuator rod displaced through a channel in the solenoid. A spool valve has a valve body that is coupled at one end to the solenoid. A spool is slidably disposed in the control channel. A first and second dampener chambers are located at the two ends of the spool. The dampeners function to improve the stability in the control system and balance the transient flow forces of the hydraulic fluid as it moves through the valve member. The spool also has a control portion is located between the first end and the second end of the spool. The control portion allows the control portion to communicate with a supply, control and exhaust passages in the valve body.

Abstract: A low leak variable bleed solenoid. The solenoid can be configured in either a proportional or inversely proportional configuration by interchanging parts of the solenoid. The solenoid includes a valve manifold for metering flow from supply to exhaust. The valve manifold includes a first valve seat and a second valve seat for selectively sealing of hydraulic supply side pressure and control side pressure.