Hybrid-type construction machine having an output condition calculating unit to calculate output conditions of an engine and an electric storage device

• US 8,285,434 B2
• Filed: 12/26/2008
• Issued: 10/09/2012
• Est. Priority Date: 12/28/2007
• Status: Expired due to Fees

• 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: Yanagisawa, Makoto, Manabe, Keiji
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Murshed, Nagi
• Application Number:
  US12/810,607
• Publication Number:
  US 20100280697A1
• Time in Patent Office: 1,383 Days
• Field of Search: None
• US Class Current: 701/22
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/1033 Input power
• 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 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• 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: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/007182 in response to battery voltage

Abstract

In the hybrid-type construction machine, the control unit (60) includes a drive distributing unit (60-8) and an output condition calculating unit (60-9). The output condition calculating unit (60-9) calculates output conditions inclusive of an output setting of the electric storage device determined from a state of charge of the electric storage device (58), an output setting of the engine determined from a number of revolutions of the engine (50), a hydraulic load required value indicative of drive power required by the oil pressure generating unit, and an electric load required value indicative of electric power required by the electric drive unit. The drive distributing unit (60-8) determines output values of the electric drive unit and the hydraulic drive unit based on the calculated output conditions.

Claims

1. A hybrid-type construction machine, comprising:

an oil pressure generating unit to convert an output of an engine into oil pressure for provision to a hydraulic drive unit;

a motor generator connected to the engine to serve as both an electric motor and a power generator;

an electric storage device to supply electric power to the motor generator to cause the motor generator to function as an electric motor;

an electric drive unit driven by electric power supplied from the electric storage device and to generate regenerative electric power for provision to the electric storage device; and

a control unit to control an operation of the motor generator,

wherein the control unit includes;

an output condition calculating unit to calculate output conditions of the engine and the electric storage device; and

a drive distributing unit to determine output values of the electric drive unit and the hydraulic drive unit based on the output conditions calculated by the output condition calculating unit.

2. The hybrid-type construction machine as claimed in claim 1, wherein the drive distributing unit generates and outputs an output instruction for controlling the operation and output of the motor generator based on settings including:

an output setting of the electric storage device determined from a state of charge of the electric storage device,

an output setting of the engine determined from a number of revolutions of the engine,

a hydraulic load required value indicative of drive power required by the oil pressure generating unit, and

an electric load required value indicative of electric power required by the electric drive unit.

3. The hybrid-type construction machine as claimed in claim 1, wherein the drive distributing unit determines electric power for a power running operation of the electric drive unit and regenerative electric power generated by a regenerative operation of the electric drive unit based on output limits of the engine and the electric storage device.

4. The hybrid-type construction machine as claimed in claim 1, wherein the drive distributing unit determines an output supplied to the hydraulic drive unit based on output limits of the engine and the electric storage device.

5. The hybrid-type construction machine as claimed in claim 1, wherein an output instruction for the electric storage device is determined based on comparison between a battery target output and battery required limit values calculated based on outputs of the engine, the electric drive unit, and the electric storage device.

6. The hybrid-type construction machine as claimed in claim 5, wherein an output of the motor generator is determined based on comparison between the output instruction for the electric storage device and one of electric power supplied to the electric drive unit or electric power output from the electric drive unit.