Hydraulic circuit and method for a material handler

A control system for a material handler comprising:

• a joystick;
• an electronic control unit (ECU) receiving a plurality of electronic input signals from the joystick;
• a hydraulic circuit hydraulically coupled to at least one hydraulic cylinder of the material handler, the hydraulic circuit comprises:
• a directional control valve comprises a central position, an extension position, and a retraction position;
• the directional control valve comprises a tank port, a pump port, a central passageway, and a pair of work ports;
• the directional control valve comprises a pair of biasing elements maintaining the directional control valve in the central position;
• a pair of solenoids controlled by the ECU and each solenoid acting in opposition to each of the pair of biasing elements of the directional control valve to move the directional control valve to the extension position or the retraction position;
• the at least one hydraulic cylinder coupled between the pair of work ports;
• a pump hydraulically coupled to the pump port and the central passageway;
• a tank hydraulically coupled to the tank port;
• a pressure buildup valve comprises a passthrough position and a constrictive position;
• the pressure buildup valve comprises a constrictive passageway hydraulically coupled to the central passageway of the directional control valve;
• the pressure buildup valve comprises a spring maintaining the pressure buildup valve in the passthrough position;
• a constrictive solenoid controlled by the ECU and when activated causes the pressure building valve to move towards the constrictive position whereby the constrictive passageway increases pressure in the central passageway of the directional control valve;
• the ECU executing instructions from a tangible computer-readable medium to:
• process the plurality of electronic input signals from the joystick;
• determine an adjustment for at least one of the pair of solenoids based on at least the plurality of electronic input signals from the joystick;
• determine a setpoint buildup pressure for the central passageway;
• actuate the at least one of the pair of solenoids based on the adjustment;
• and
• actuate the constrictive solenoid of the pressure buildup valve based on the setpoint buildup pressure.