Shovel and method of controlling shovel

• US 8,924,064 B2
• Filed: 10/30/2013
• Issued: 12/30/2014
• Est. Priority Date: 06/09/2011
• Status: Expired due to Fees

• 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: Magaki, Hideto, Shiratani, Ryuji
• Primary Examiner(s): Olszewski, John R
• Assistant Examiner(s): MERLINO, DAVID P
• Application Number:
  US14/066,752
• Publication Number:
  US 20140058607A1
• Time in Patent Office: 426 Days
• Field of Search: None
• US Class Current: 701/22
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: E02F 3/32 working downwardly and towards the machine, e.g. with backhoes
• CPC Class Codes: E02F 3/435 for dipper-arms, backhoes or the like
• 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 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: F02D 11/107 Safety-related aspects
• CPC Class Codes: F02D 29/04 peculiar to engines driving pumps
• CPC Class Codes: F02D 31/002 controlling air supply
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0205 using an auxiliary engine speed control engine speed control per se F02D31/00
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18

Abstract

A shovel includes an internal combustion engine, a hydraulic pump connected to the internal-combustion engine, a generator connected to the internal-combustion engine, and a control part that controls the generator. The control part increases an electric generation load of the generator before a hydraulic load of the hydraulic pump increases.

Claims

1. A method of controlling a shovel comprising:

determining a change in a hydraulic load of a hydraulic pump, which is connected to an internal-combustion engine; and

increasing a load applied to the internal-combustion engine by generating electricity with a generator, which is connected to the internal-combustion engine, before the hydraulic load of the hydraulic pump increases

wherein a supercharge pressure generated by a supercharger, which is provided in the internal-combustion engine, is increased or is maintained to have a value equal to or greater than a predetermined value by increasing an electric generation load of the generator so as to increase the load applied onto the internal-combustion engine.

2. The method of controlling the shovel according to claim 1,

wherein the increasing the electric generation load of the generator, which is connected to the internal-combustion engine, occurs regardless of whether an electric load, to which electric power generated by the generator is supplied, requires electric generation.

3. The method of controlling the shovel according to claim 1,

wherein a load is applied to the internal-combustion engine by driving the generator when a hydraulic load, which is being applied to the hydraulic pump, is decreased.

4. The method of controlling the shovel according to claim 3,

wherein the load applied to the internal-combustion engine is decreased or is stopped being applied to the internal-combustion engine by operating the generator when a predetermined time passes after the decrease of the hydraulic load, which is being applied to the hydraulic pump, is detected and the hydraulic load exceeds a predetermined value.

5. The method of controlling the shovel according to claim 1,

wherein the supercharge pressure generated by the supercharger is increased by driving the generator so as to apply the load to the internal-combustion engine when an operating lever is operated to drive a hydraulic operation element.

6. A shovel comprising:

an internal combustion engine;

a hydraulic pump connected to the internal-combustion engine;

a generator connected to the internal-combustion engine;

a control part that controls the generator; and

an electric load to which electric power generated by the generator is supplied,

wherein the control part increases a load applied to the internal-combustion engine by generating electricity with the generator before a hydraulic load of the hydraulic pump increases,

wherein the control part increases the load applied to the internal-combustion engine by generating electricity with the generator regardless of whether the electric load requires electric generation.

7. The shovel according to claim 6,

wherein the control part applies a load to the internal-combustion engine by driving the generator when a hydraulic load, which is being applied to the hydraulic pump, is decreased during an operation of the shovel.

8. The shovel according to claim 7,

wherein the control part decreases the load applied to the internal-combustion engine or stops applying the load to the internal-combustion engine by operating the generator when a predetermined time passes after the decrease of the hydraulic load, which is being applied to the hydraulic pump, is detected and the hydraulic load exceeds a predetermined value.

9. The shovel according to claim 7,

wherein the control part detects a change of the hydraulic load applied to the hydraulic pump based on at least any one of an operation quantity of an operation lever for driving a hydraulic operation element, a discharge pressure of the hydraulic pump, a supercharge pressure of the internal-combustion engine, and an output of the internal-combustion engine.

10. The shovel according to claim 6,

wherein the control part causes the supercharge pressure generated by the supercharger to increase by driving the generator so as to apply the load to the internal-combustion engine when an operating lever is operated to drive a hydraulic operation element.

11. The shovel according to claim 10,

wherein the control part decreases the load applied to the internal-combustion engine or stops applying the load to the internal-combustion engine by operating the generator when a predetermined time passes after an operation quantity of the operation lever exceeds a predetermined value.

12. The shovel according to claim 6,

wherein the control part increases the load applied to the internal-combustion engine by the generator before the hydraulic load of the hydraulic pump increases to cause an output from the internal-combustion engine to be increased before the hydraulic load of the hydraulic pump increases.

13. A shovel comprising:

an internal combustion engine;

a hydraulic pump connected to the internal-combustion engine;

a generator connected to the internal-combustion engine; and

a control part that controls the generator,

wherein the control part increases a load applied to the internal-combustion engine by generating electricity with the generator before a hydraulic load of the hydraulic pump increases,

wherein the control part causes a supercharge pressure generated by a supercharger, which is provided in the internal-combustion engine, to increase or to be maintained to have a value equal to or greater than a predetermined value by increasing the load applied to the internal-combustion engine by generating electricity with the generator so as to increase the load applied to the internal-combustion engine.

14. The shovel according to claim 13,

wherein the control part applies a load to the internal-combustion engine by driving the generator when a hydraulic load, which is being applied to the hydraulic pump, is decreased during an operation of the shovel.

15. The shovel according to claim 14,

wherein the control part decreases the load applied to the internal-combustion engine or stops applying the load to the internal-combustion engine by operating the generator when a predetermined time passes after the decrease of the hydraulic load, which is being applied to the hydraulic pump, is detected and the hydraulic load exceeds a predetermined value.

16. The shovel according to claim 14,

wherein the control part detects a change of the hydraulic load applied to the hydraulic pump based on at least any one of an operation quantity of an operation lever for driving a hydraulic operation element, a discharge pressure of the hydraulic pump, a supercharge pressure of the internal-combustion engine, and an output of the internal-combustion engine.

17. The shovel according to claim 13,

wherein the control part causes the supercharge pressure generated by the supercharger to increase by driving the generator so as to apply the load to the internal-combustion engine when an operating lever is operated to drive a hydraulic operation element.

18. The shovel according to claim 17,

wherein the control part decreases the load applied to the internal-combustion engine or stops applying the load to the internal-combustion engine by operating the generator when a predetermined time passes after an operation quantity of the operation lever exceeds a predetermined value.

19. The shovel according to claim 13,

wherein the control part increases the load applied to the internal-combustion engine by the generator before the hydraulic load of the hydraulic pump increases to cause an output from the internal-combustion engine to be increased before the hydraulic load of the hydraulic pump increases.