Shovel

• US 10,060,096 B2
• Filed: 08/04/2016
• Issued: 08/28/2018
• Est. Priority Date: 03/06/2014
• 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): Restifo, Jeffrey J
• Application Number:
  US15/228,906
• Publication Number:
  US 20160340870A1
• Time in Patent Office: 754 Days
• Field of Search: 180305, 180306, 180307
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60K 6/54 Transmission for changing ratio
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• 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 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2091 Control of energy storage means for electrical energy, e.g. battery or capacitors energy recovery arrangements in hydraulic or pneumatic drives E02F9/2217
• 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 9/2296 : Systems with a variable displacement pump
• CPC Class Codes: H01M 10/443 : in response to temperature
• CPC Class Codes: H01M 10/63 : Control systems charging or discharging in response to temperature H01M10/44 , H01M10/443; measurement of temperature H01M10/48 , H01M10/486
• CPC Class Codes: H02J 7/14 : for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• 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: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/903 : having energy storing means, e.g. battery, capacitor

Abstract

A shovel according to embodiments of the present invention includes a lower travelling body, an upper swivel body, an operation attachment, an engine, a motor generator which is connected to the engine, a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment, a swiveling electric motor which is mounted on the upper swivel body, a power storage device, a DC bus which electrically connects the power storage device and the swiveling electric motor to each other, and a control device, in which the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature.

Claims

1. A shovel comprising:

a lower travelling body;

an upper swivel body;

an operation attachment;

an engine;

a motor generator which is connected to the engine;

a hydraulic pump which is connected to the motor generator and supplies hydraulic oil to the operation attachment;

a swiveling electric motor which is mounted on the upper swivel body;

a power storage device;

a DC bus which electrically connects the power storage device and the swiveling electric motor to each other; and

a control device,

wherein the control device decreases a charging/discharging limit value of the power storage device and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device to the swiveling electric motor, according to a decrease of temperature.

2. The shovel according to claim 1, wherein the control device decreases a change of each of the charging limit value and the discharging limit value with respect to a change of a state-of-charge of the power storage device and decreases a change of the discharging requirement value with respect to the change of the state-of-charge, according to the decrease of temperature.

3. The shovel according to claim 1, wherein the control device decreases a discharging start state-of-charge according to the decrease of temperature.

4. The shovel according to claim 1, wherein the control device decreases a swivel speed limit value according to the decrease of temperature.

5. The shovel according to claim 4, wherein the control device decreases a swivel torque limit value according to a decrease of the swivel speed limit value.

6. The shovel according to claim 4, wherein the control device decreases an ejection amount of the hydraulic pump according to the decrease of the swivel speed limit value.

7. The shovel according to claim 1, wherein the control device decreases the discharging requirement value according to the decrease of temperature when swivel regeneration is performed.

8. The shovel according to claim 1, wherein the control device decreases the discharging requirement value according to the decrease of temperature when swiveling power runs.

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

a hydraulic drive system which drives the operation attachment, and

wherein the control device charges and discharges the power storage device to warm up the power storage device during warming-up of the hydraulic drive system.

10. The shovel according to claim 9, wherein the control device decreases an absorption horsepower of the hydraulic pump which configures the hydraulic drive system in a case where the motor generator is operated as a generator during warming-up of the hydraulic drive system and warming-up of the power storage device.

11. The shovel according to claim 9, wherein the control device increases an absorption horsepower of the hydraulic pump which configures the hydraulic drive system in a case where the motor generator is operated as an electric motor during warming-up of the hydraulic drive system and warming-up of the power storage device.

12. The shovel according to claim 9, wherein the control device determines whether or not the hydraulic drive system is being warmed-up.

13. The shovel according to claim 9, wherein the control device starts warming-up of the power storage device in a case where a temperature related to the power storage device is less than or equal to a predetermined temperature, and a swiveling operation and a traveling operation are not performed.

14. The shovel according to claim 9, wherein the control device stops warming-up of the power storage device in a case where a temperature related to the power storage device is equal to or more than a predetermined temperature, or a swiveling operation or a traveling operation is performed.