Height control valve for vehicle leveling system

A height control valve for a vehicle having a first member and a second member that moves relative to the first member and at least one air spring, the valve comprising:

• an actuator joined with the first member;
• a housing joined with the second member;
• a sensor joined with the housing, the sensor generating a position signal indicative of movement of the first member relative to the second member;
• a servo joined with the housing, the servo powered by a servo current;
• a valve assembly including a plunger, the plunger operably joined with and moveable by the servo, the plunger adapted to move, and to control the flow of fluid to and from the vehicle air spring;
• and
• a controller that receives the position signal and that detects a change in the servo current, and that actuates the servo to move the plunger a selected distance in response to the change in the servo current.

A height control valve comprising:

• a valve assembly defining a bore;
• a plunger moveably positioned in the bore;
• a servo joined with the plunger and adapted to move the plunger within the bore to a plurality of positions, the servo being powered by a servo current, the servo including a linkage, the servo current changing upon the linkage engaging the plunger;
• a controller in communication with the servo, the controller adapted to sense a change in the servo current, to determine a selected distance for movement of the plunger and to actuate the servo to move the plunger the selected distance.

A height control valve for a vehicle having a first member and a second member that moves relative to the first member and at least one air spring, the valve comprising:

• an actuator joined with the first member;
• a housing joined with the second member;
• a sensor joined with the housing, the sensor generating a position signal indicative of movement of the first member relative to the second member;
• a servo joined with the housing, the servo powered by a servo current;
• a valve assembly including a plunger and a biasing element, the plunger being operably joined with and moveable by the servo to an exhaust position wherein fluid flows from the vehicle air spring, and a supply position wherein fluid flows to the vehicle air spring;
• and the biasing element urging the plunger toward a neutral position at which air is neither exhausted nor supplied to the air spring;
• a controller that receives the position signal and that actuates the servo to move the plunger a selected distance in response to the position signal,
• wherein the biasing element moves the plunger toward the neutral position when the servo current at least one of reduces and terminates.