Shovel

• US 10,100,493 B2
• Filed: 08/04/2016
• Issued: 10/16/2018
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Sumitomo (S.H.I.) Construction Machinery Co., Ltd. (Sumitomo Heavy Industries Limited)
• Original Assignee: Sumitomo (S.H.I.) Construction Machinery Co., Ltd. (Sumitomo Heavy Industries Limited)
• Inventors: Takeo, Jitsutaka
• Primary Examiner(s): Phan, Hau V
• Application Number:
  US15/228,923
• Publication Number:
  US 20160340865A1
• Time in Patent Office: 803 Days
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60W 2300/17 Construction vehicles, e.g. graders, excavators
• CPC Class Codes: E02F 3/32 working downwardly and towards the machine, e.g. with backhoes
• CPC Class Codes: E02F 9/123 Drives or control devices specially adapted therefor E02F9/125 and E02F9/128 take precedence
• CPC Class Codes: E02F 9/2033 Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin sub-groups of E02F3/431 of E02F3/435 take precedence; for turntables E02F9/123
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/2285 Pilot-operated systems
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump
• CPC Class Codes: E02F 9/265 with follow-up actions (e.g. control signals sent to actuate the work tool)
• CPC Class Codes: E02F 9/268 : with failure correction follow-up actions
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10S 903/903 : having energy storing means, e.g. battery, capacitor

Abstract

A shovel according to an embodiment of the present invention includes an engine; a motor generator that functions as a motor that uses a drive force of the engine and functions as a motor capable of assisting the engine; a power storage system, a swiveling motor; a DC bus that connects the motor generator, the power storage system, and the swiveling motor; and a controller that controls movements of the motor generator, the power storage system, and the swiveling motor. In a case where the power storage system is stopped, the controller supplies electric power of the motor generator that functions as the power generator to the swiveling motor when the swiveling motor is in a power running operation, and supplies regenerative electric power of the swiveling motor to the motor generator that functions as the motor when the swiveling motor is in a regenerative operation.

Claims

1. A shovel comprising:

a hydraulic pump;

a motor generator that configured to drive the hydraulic pump;

a power storage system;

a swiveling motor performing a swiveling operation by electric power; and

a control device,

wherein when the power storage system is stopped, the control device supplies regenerative electric power generated during deceleration of the swiveling motor to the motor generator.

2. The shovel according to claim 1, further comprising:

a heat consumption unit that consumes the regenerative electric power of the swiveling motor as heat.

3. The shovel according to claim 1, wherein when the power storage system is stopped, the control device limits a swiveling torque to limit the regenerative electric power generated by the swiveling motor.

4. The shovel according to claim 3, wherein when the power storage system is stopped and a complex operation including a swivel operation and an operation of a hydraulic actuator is performed, the control device limits a movement of the hydraulic actuator according to the limited swiveling torque.

5. The shovel according to claim 1, further comprising:

a slope detection unit that detects that the shovel is disposed at a slope,

wherein the shovel is detected to be at the slope and the power storage system is stopped, the control device supplies the electric power of the motor generator to the swiveling motor, and supplies the regenerative electric power of the swiveling motor to the motor generator.

6. The shovel according to claim 1, wherein when the power storage system is stopped, the control device limits a braking torque according to a posture of the shovel.

7. The shovel according to claim 1, wherein, after the power storage system is stopped and a swivel body driven by the swiveling motor is stopped, the control device allows the swiveling motor to be driven using generated by the motor generator and allows the motor generator to be driven using the regenerative electric power generated by the swiveling motor.

8. The shovel according to claim 7, wherein, when the swiveling motor and the motor generator are allowed to be driven, the control device suppresses output of the swiveling motor and the motor generator such that a swiveling speed of the swiveling motor is reduced and a moving speed of the hydraulic actuator driven by the motor generator and the hydraulic pump is reduced.