Patent attributes
A power shovel vehicle including a hydraulic pump that outputs hydraulic oil for operating a hydraulic actuator, an electric motor for driving the hydraulic pump, a main battery for supplying direct current electric power, an inverter for converting the direct current electric power into alternating current electric power and operating the electric motor, a second relay for making and breaking the connection between the main battery and the inverter, an operating device for operating the hydraulic actuator, a controller for controlling operation of the hydraulic actuator and inverter, and turning on and off the second relay, a first relay for making and breaking the connection between the main battery and the controller, a power source monitoring controller for monitoring conditions of the main battery and turning on and off the first relay, a hydraulic sensor for detecting the discharge pressure of the hydraulic pump, and an electric current sensor for measuring a load current flowing into the inverter.
