Patent ID: 9702116
Date: 2017-07-11
CPC Classifications: B60K,B60L,B60W,E02F,H02J,Y02T,Y10S

Claim:
1. A shovel comprising: a swivel body; an engine; a motor generator configured to generate electric power and driven by the engine; a power storage device configured to store the electric power generated by the motor generator; a swiveling electric motor coupled to the motor generator and the power storage device, the swiveling electric motor configure to swivel the swivel body based on electric power provided by at least one of the motor generator and the power storage device; and a control device configured to charge electric power to or discharge electric power from the power storage device, wherein the control device is configured to control the power storage device to discharge the electrical power to the swiveling electric motor without providing electric power from the motor generator to the swiveling electric motor during a first time period of a swiveling operation and control the motor generator to provide electric power to the swiveling electric motor to drive the swiveling electric motor during a second time period of the swiveling operation, the second time period subsequent to the first time period.