VARIABLE DISPLACEMENT PISTON PUMP WITH ELECTRONIC CONTROL UNIT TO PROVIDE DIRECT METERING CONTROL

A variable displacement piston pump, having: a housing (170), a pivot assembly (190) to pivot between minimal and maximum pivot angles; a pump cover (350) defining an actuator bore with an actuator piston (370), an actuator arm (380) extending from the actuator piston to the pivot assembly; and an electronic control unit (ECU) coupled to the pump, the ECU having: a pump controller (400), a linear variable differential transducer (LVDT) coupled to the pump controller and the actuator piston, and an electrohydraulic solenoid valve (EHSV) coupled to the pump controller, the ECU is configured to: determine a pivot differential for the pivot assembly between a target pivot angle and a current pivot angle; determine a position differential for the actuator piston, corresponding to the pivot differential of the pivot assembly; control the EHSV to move the actuator piston by the position differential; and determine, from the LVDT, that the actuator piston moved by the position differential.