Hybrid-type construction machine

• US 8,948,944 B2
• Filed: 01/29/2010
• Issued: 02/03/2015
• Est. Priority Date: 01/29/2010
• Status: Active Grant

• Current Assignee: Sumitomo Construction Machinery Sales Company Limited (Sumitomo Heavy Industries Limited), Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited, Sumitomo (S.H.I.) Construction Machinery Co., Ltd. (Sumitomo Heavy Industries Limited)
• Inventors: Kawashima, Koji
• Primary Examiner(s): Badii, Behrang
• Application Number:
  US13/575,378
• Publication Number:
  US 20120296510A1
• Time in Patent Office: 1,831 Days
• Field of Search: 701/22, 701/50, 903/903, 903/902, 903/907, 180/65.275, 180/62.21, 180/65.26, 180/65.21, 180/53.8, 320/104, 373/48
• US Class Current: 701/22
• CPC Class Codes: B60K 6/20 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 30/1884 Avoiding stall or overspeed of the engine
• CPC Class Codes: B60W 30/1888 Control of power take off [PTO]
• CPC Class Codes: B60Y 2200/25 Track vehicles
• CPC Class Codes: B60Y 2200/412 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 9/2091 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 9/22 Hydraulic or pneumatic drives for dipper or bucket arm position control E02F3/43, for blade position control for graders E02F3/844; for turntables E02F9/121; for fork-lift trucks B66F9/22
• CPC Class Codes: E02F 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: F02D 29/04 peculiar to engines driving pumps
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A hybrid-type construction machine includes: an engine to drive a variable-volume-type hydraulic pump; a plurality of hydraulic actuators driven by a hydraulic pressure from the variable-volume-type hydraulic pump; and a motor generator driven by an electric power from an electric power accumulator to assist the engine. A maximum output of the variable-volume-type hydraulic pump is equal to or larger than a maximum output of the engine. When operating by setting an output of the variable-volume-type hydraulic pump larger than the maximum output of the engine, the engine is assisted by the motor generator.

Claims

1. A hybrid-type construction machine, comprising:

an engine to drive a variable-volume-type hydraulic pump;

a plurality of hydraulic actuators driven by a hydraulic pressure from the variable-volume-type hydraulic pump; and

a motor generator driven by an electric power from an electric power accumulator to assist the engine,

wherein a maximum output of said variable-volume-type hydraulic pump is equal to or larger than a maximum output of said engine, and

when operating by setting an output of said variable-volume-type hydraulic pump larger than the maximum output of said engine, said engine is assisted by said motor generator.

2. The hybrid-type construction machine as claimed in claim 1, wherein in a case where the hydraulic actuator to be driven is a hydraulic actuator capable of performing a continuous operation, the output of said variable-volume-type hydraulic pump is set to a first output equal to or smaller than the maximum output of said engine.

3. The hybrid-type construction machine as claimed in claim 1, wherein in a case where the hydraulic actuator to be driven is a hydraulic cylinder, the output of said variable-volume-type hydraulic pump is set to a second output larger than the maximum output of said engine.

4. The hybrid-type construction machine as claimed in claim 1, wherein an output of said variable-volume-type hydraulic pump is set based on presence or absence of an operation of each of said hydraulic actuators.

5. The hybrid-type construction machine as claimed in claim 1, wherein in a case where only one of said hydraulic actuator is operating, an output of said variable-volume-type hydraulic pump is set to a second output larger than the maximum output of said engine.

6. The hybrid-type construction machine as claimed in claim 1, wherein an output of said variable-volume-type hydraulic pump is set based on a driving direction of each of said hydraulic actuators.

7. The hybrid-type construction machine as claimed in claim 1, including a boom and an arm driven by said hydraulic actuators, wherein an output of said variable-volume-type hydraulic pump is set based on driving directions of said boom and said arm.

8. The hybrid-type construction machine as claimed in claim 1, wherein in a case where said hydraulic actuators are not driven, an output of said variable-volume-type hydraulic pump is set to a value smaller than the maximum output of said engine.

9. The hybrid-type construction machine as claimed in claim 1, wherein a kind and an operating condition of said hydraulic actuators are determined based on a lever operation of an operator.

10. A control method of a hybrid-type construction machine, the hybrid-type construction machine including:

an engine to drive a variable-volume-type hydraulic pump;

a plurality of hydraulic actuators driven by a hydraulic pressure from the variable-volume-type hydraulic pump; and

a motor generator driven by an electric power from an electric power accumulator to assist the engine,

the control method comprising;

setting a maximum output of said variable-volume-type hydraulic pump to be equal to or larger than a maximum output of said engine; and

assisting said engine by said motor generator when operating said hybrid-type construction machine by setting an output of said variable-volume-type hydraulic pump larger than the maximum output of said engine.

11. The control method as claimed in claim 10, wherein in a case where the hydraulic actuator to be driven is a hydraulic actuator capable of performing a continuous operation, the output of said variable-volume-type hydraulic pump is set to a first output equal to or smaller than the maximum output of said engine.

12. The control method as claimed in claim 10, wherein in a case where only one of said hydraulic actuator is operating, the output of said variable-volume-type hydraulic pump is set to a second output larger than the maximum output of said engine.

13. The control method as claimed in claim 10, wherein an output of said variable-volume-type hydraulic pump is set based on a driving direction of each of said hydraulic actuators.