Control system

Abstract

A working machine including a hydraulic system. The hydraulic system includes: a hydraulically actuated device; a hydraulic pump assembly for supplying a variable output of hydraulic fluid to the hydraulically actuated device; an electric motor coupled to the hydraulic pump assembly such that output of hydraulic fluid from the hydraulic pump assembly is varied by adjusting the rotation speed of the electric motor; and a motor controller configured to: generate a motor control signal for operating the electric motor based on a motor speed command signal. The hydraulic system does not include a rotor positioning sensor arranged to sense the rotational position of a rotor of the electric motor.

Dependencies are inferred from the claim text.