HYBRID-TYPE WORKING MACHINE

• US 20100268407A1
• Filed: 04/12/2010
• Published: 10/21/2010
• Est. Priority Date: 04/20/2009
• Status: Active Grant

• Current Assignee: Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited
• Inventors: YANAGISAWA, MAKOTO
• Granted Patent: US 8,364,333 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60Y 2200/41 Construction vehicles, e.g. graders, excavators
• 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: Y02T 10/62 Hybrid vehicles

Abstract

A hybrid-type working machine includes a plurality of electric loads and an electric storage part supplying an electric power to a motor generator and the electric loads. A priority setting part sets a priority to each electric load. A supply power computing part computes an available electric power, which can be supplied from the motor generator and the electric storage part to the electric loads. A total power computing part computes a total electric power amount by summing electric power amounts requested by the electric loads. A power distributing part compares the available electric power with the total electric power amount, and, when the available electric power is larger than the total electric power amount, determines a distribution ratio of electric power amounts to be supplied to the respective electric loads based on the priority to limit the electric power amounts supplied to the electric loads.

Claims

1. A hybrid-type working machine comprising:

an engine that drives a hydraulic pump;

a motor generator that assists the engine;

a plurality of electric loads;

an electric storage part that supplies electric power to the motor generator and the electric loads; and

a control part that controls said engine, said motor generator, said electric loads and said electric storage part,

wherein the control part includes;

a priority setting part configured to set a priority to each of said electric loads;

a supply power computing part configured to compute an available electric power, which can be supplied from said motor generator and said electric storage part to said electric loads;

a total power computing part configured to compute a total electric power amount by summing electric power amounts requested by said electric loads; and

a power distributing part configured to compare said available electric power with said total electric power amount, and, when said available electric power is larger than said total electric power amount, determine a distribution ratio of electric power amounts to be supplied to the respective electric loads based on said priority to limit the electric power amounts supplied to said electric loads.

2. The hybrid-type working machine as claimed in claim 1, wherein said power distributing part determines the distribution ratio so that no limitation is applied to the electric power amount to be supplied to one of said electric loads, which one is given said priority indicating a highest priority.

3. The hybrid-type working machine as claimed in claim 2, wherein, when the electric power amount requested by said one of said electric loads given the highest priority is larger than the available electric power, said power distributing part determines the distribution ratio so that the entire available electric power is supplied to said one of said electric loads given the highest priority.

4. The hybrid-type working machine as claimed in claim 1, wherein, when there are a plurality of electric loads given the same priority from among said electric loads, said power distributing part determines the distribution ratio so that the electric power amount to be supplied to said plurality of electric loads given the same priority is divided according to a ratio of electric power amounts requested by each of said plurality of electric loads given the same priority.

5. The hybrid-type working machine as claimed in claim 1, wherein, when said plurality of electric loads includes a lifting magnet, said priority setting part sets a highest priority to the lifting magnet.