Hybrid construction machine

• US 9,873,349 B2
• Filed: 02/02/2016
• Issued: 01/23/2018
• Est. Priority Date: 02/26/2015
• Status: Active Grant

• Current Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Original Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Inventors: Doi, Takayuki, Kamimura, Yusuke
• Primary Examiner(s): Trivedi, Atul
• Application Number:
  US15/013,221
• Publication Number:
  US 20160250936A1
• Time in Patent Office: 721 Days
• Field of Search: 701 22
• CPC Class Codes: B60K 6/22 characterised by apparatus, components or means specially adapted for HEVs
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• 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 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 2300/17 Construction vehicles, e.g. graders, excavators
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/30 Auxiliary equipments
• CPC Class Codes: B60W 30/194 related to low temperature conditions, e.g. high viscosity of hydraulic fluid
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/91 Battery charging
• 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 9/2235 including an electronic controller
• CPC Class Codes: E02F 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: E02F 9/226 : Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• CPC Class Codes: E02F 9/2296 : Systems with a variable displacement pump
• 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: F15B 21/0427 : Heating
• CPC Class Codes: F15B 2211/20515 : Electric motor
• CPC Class Codes: F15B 2211/20523 : Internal combustion engine
• CPC Class Codes: F15B 2211/20546 : variable capacity
• CPC Class Codes: F15B 2211/50518 : using pressure relief valves
• CPC Class Codes: F15B 2211/50536 : using unloading valves controlling the supply pressure by diverting fluid to the return line
• CPC Class Codes: F15B 2211/6309 : the pressure being a pressure source supply pressure
• CPC Class Codes: F15B 2211/6652 : Control of the pressure source, e.g. control of the swash plate angle
• CPC Class Codes: F15B 2211/6655 : Power control, e.g. combined pressure and flow rate control
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A first warming-up control unit calculates warming-up time charging power from a power storage SOC and power storage temperature and causes a generator motor to perform power generation operation thereby charging a power storage unit on the basis of the calculated warming-up time charging power. A second warming-up control unit applies, during the power generation operation, a hydraulic load to a hydraulic pump by a hydraulic load unit and performs horsepower control of the hydraulic pump using a value obtained by subtracting the warming-up time charging power from preset warming-up time pump horsepower.

Claims

1. A hybrid construction machine comprising:

an engine;

a generator motor that is driven by the engine;

a hydraulic pump of a variable capacity type that is driven by the engine;

a power storage unit that is charged by power generation operation of the generator motor;

a power storage temperature detecting unit that detects power storage temperature, which is a temperature of the power storage unit;

a power storage SOC detecting unit that detects a power storage SOC, which is a charging state of the power storage unit;

a pump-pressure detecting unit that detects a pump pressure for horsepower control of the hydraulic pump;

a hydraulic load unit that applies a hydraulic load to the hydraulic pump; and

a control unit that performs warming-up control for raising temperatures of the power storage unit and the hydraulic oil, wherein

the control unit includes;

a first warming-up control unit that calculates warming-up time charging power, which is charging power during warming up from the power storage SOC and the power storage temperature, and causes the generator motor to perform the power generation operation, thereby charging the power storage unit on the basis of the calculated warming-up time charging power, wherein the first warming-up control unit includes an inverter and a power-storage warming-up control unit, the first warming-up control unit calculates a torque command for actuating the generator motor as the generator with the calculated warming-up time charging power, and the inverter actuates the generator motor as the generator with the warming-up time charging power indicated by the torque command, thereby performing the warming-up control; and

a second warming-up control unit that applies, during the power generation operation, the hydraulic load to the hydraulic pump by the hydraulic load unit and performs the horsepower control of the hydraulic pump using a value obtained by subtracting the warming-up time charging power from preset warming-up time pump horsepower.

2. The hybrid construction machine according to claim 1, wherein the first warming-up control unit calculates warming-up discharging power, which is discharging power during warming-up from the power storage SOC and the power storage temperature, and causes the generator motor to perform assist operation of the engine on the basis of the calculated warming-up time discharging power.

3. The hybrid construction machine according to claim 2, wherein, during the assist operation, the first warming-up control unit performs horsepower control of the hydraulic pump using a value obtained by adding the warming-up time discharging power to the warming-up time pump horsepower.

4. The hybrid construction machine according to claim 2, wherein the first warming-up control unit causes the generator motor to alternately perform the power generation operation and the assist operation.

5. The hybrid construction machine according to claim 1, wherein the first warming-up control unit starts the warming-up when the power storage temperature detected by the power storage temperature detecting unit drops to a preset warming-up start temperature or less.