Electronically controlled valve, hydraulic pump, and hydraulic pump system

A hydraulic pump system comprising:

• a hydraulic pump, the hydraulic pump comprising:
• a variable displacement pump having a swash plate;
• an outlet piston chamber which is in constant communication with a pump outlet of the variable displacement pump, wherein, an outlet piston which is connected to an end of the swash plate is movably provided inside the outlet piston chamber;
• and
• a servo piston chamber, wherein, a servo piston which is connected to the other end of the swash plate is movably provided inside the servo piston chamber;
• an electronically controlled valve in fluid communication with the variable displacement pump;
• a controller operatively connected to an actuator of the electronically controlled valve;
• an angle sensor configured to detect a swashplate angle of the hydraulic pump;
• a first pressure sensor configured to detect pump outlet pressure of the hydraulic pump;
• a speed sensor configured to detect a rotation speed of the hydraulic pump;
• and
• a second pressure sensor configured to detect load pressure;
• wherein the controller is configured to selectively operate between an electrically proportional displacement control mode, a pressure compensation control mode, a constant power control mode and a load sensitive control mode;
• wherein, in the electrically proportional displacement control mode, the controller is configured to operate the actuator of the electronically controlled valve based on input from the angle sensor and not based on any input from the first pressure sensor, the speed sensor and the second pressure sensor;
• wherein, in the pressure compensation control mode, the controller is configured to operate the actuator of the electronically controlled valve based on input from the first pressure sensor and not based on any input from the angle sensor, the speed sensor and the second pressure sensor;
• wherein, in the constant power control mode, the controller is configured to operate the actuator of the electronically controlled valve based on input from the angle sensor, the first pressure sensor and the speed sensor and not based on any input from the second pressure sensor;
• and
• wherein, in the load sensitive control mode, the controller is configured to operate the actuator of the electronically controlled valve based on input from the first pressure sensor and the second pressure sensor not based on any input from the angle sensor and the speed sensor.