Shovel

• US 10,053,835 B2
• Filed: 06/22/2017
• Issued: 08/21/2018
• Est. Priority Date: 12/26/2014
• 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: Magaki, Hideto, Sano, Kiminori, Shiratani, Ryuji
• Primary Examiner(s): PEZZUTO, ROBERT ERIC
• Application Number:
  US15/629,927
• Publication Number:
  US 20170292241A1
• Time in Patent Office: 425 Days
• Field of Search: 37348, 37411, 37414, 172 2- 11, 414694, 701 22, 701 50, 701102
• CPC Class Codes: B60R 11/06 for tools or spare parts for vehicle roof parts B60J7/20; for spare wheels B62D
• CPC Class Codes: E02F 3/00 Dredgers; Soil-shifting machines for special purposes E02F5/00; other machines or apparatus for mining E21C; tunnelling E21D
• CPC Class Codes: E02F 3/40 Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets devices to connect tools to arms or booms E02F3/3604; teeth therefor E02F9/28
• CPC Class Codes: E02F 3/963 Arrangements on backhoes for alternate use of different tools backhoes per se E02F3/30; quick-acting devices to connect tools to arms E02F3/3609, for arms to tractors or the like E02F3/627
• CPC Class Codes: E02F 5/00 Dredgers or soil-shifting machines for special purposes
• CPC Class Codes: E02F 5/02 for digging trenches or ditches machines for making foundation slots E02F3/205, E02F3/475 take precedence; agricultural ploughs for working ridges A01B13/02
• CPC Class Codes: E02F 9/2066 of the type combustion engines
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/264 Sensors and their calibration for indicating the position of the work tool
• CPC Class Codes: F02D 23/00 Controlling engines characterised by their being supercharged
• CPC Class Codes: F02D 29/00 Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators

Abstract

A shovel includes an attachment including a working assembly, a diesel engine provided with a supercharger, an oil hydraulic pump connected to the diesel engine provided with the supercharger, and a controller that executes a preload boost function, wherein the preload boost function is for increasing boost pressure of the supercharger prior to increasing a hydraulic pressure load on the oil hydraulic pump, wherein a range accessible by a predetermined part of the attachment includes a partial range at which, upon the working assembly being operated, the preload boost function is to be executed and a partial range at which, upon the working assembly being operated, the preload boost function is not to be executed.

Claims

1. A shovel comprising:

an attachment including a working assembly;

a diesel engine provided with a supercharger;

an oil hydraulic pump connected to the diesel engine provided with the supercharger; and

a controller that executes a preload boost function, wherein the preload boost function is for increasing boost pressure of the supercharger prior to increasing a hydraulic pressure load on the oil hydraulic pump,

wherein a range accessible by a predetermined part of the attachment includes a partial range at which, upon the working assembly being operated, the preload boost function is to be executed and a partial range at which, upon the working assembly being operated, the preload boost function is not to be executed.

2. The shovel according to claim 1, wherein the controller causes an absolute value of an increase in the boost pressure to be decreased, the increase in the boost pressure being achieved by execution of the preload boost function, as a position of the predetermined part of the attachment is more separated from a reference position or a reference range.

3. The shovel according to claim 1, wherein the controller causes an absolute value of an increase in a load on the diesel engine provided with the supercharger to be decreased, the increase in the load on the diesel engine being achieved by execution of the preload boost function, as a position of the predetermined part of the attachment is more separated from a reference position or a reference range.

4. The shovel according to claim 2, wherein the controller causes the absolute value of the increase in the boost pressure to be decreased, the increase in the boost pressure being achieved by the execution of the preload boost function, as a height of the predetermined part of the attachment becomes higher than the reference position, as a depth of the predetermined part of the attachment becomes deeper than the reference position, or as a reach of the attachment becomes longer.

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

a motor generator connected to the diesel engine provided with the supercharger,

wherein the controller causes an electric power generation amount generated by the motor generator to be increased so as to increase the boost pressure of the supercharger, prior to increasing the hydraulic pressure load on the oil hydraulic pump.

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

an orientation detector that detects an orientation of the attachment,

wherein the controller obtains information about a position of the predetermined part of the attachment based on an output of the orientation detector.

7. The shovel according to claim 1, wherein the partial range at which, upon the working assembly being operated, the preload boost function is not to be executed is located adjacent to at least one of an upper part, a lower part, and a distant part of the partial range at which, upon the working assembly being operated, the preload boost function is to be executed.

8. The shovel according to claim 1, wherein the partial range at which, upon the working assembly being operated, the preload boost function is to be executed is closer to the shovel compared to the partial range at which, upon the working assembly being operated, the preload boost function is not to be executed.

9. The shovel according to claim 8, wherein another partial range at which, upon the working assembly being operated, the preload boost function is not to be executed is located at a position closer to the shovel, compared to the partial range at which, upon the working assembly being operated, the preload boost function is to be executed.

10. The shovel according to claim 1, wherein the working assembly is operated when a boom raising operation is performed, when an arm closing operation is performed, or when a bucket closing operation is performed.