Hybrid construction machine

• US 8,942,872 B2
• Filed: 03/31/2011
• Issued: 01/27/2015
• Est. Priority Date: 05/14/2010
• Status: Expired due to Fees

• Current Assignee: KYB Corp.
• Original Assignee: Kayaba Industry Company Limited (KYB Corp.)
• Inventors: Kawasaki, Haruhiko, Egawa, Masahiro
• Primary Examiner(s): To, Tuan C.
• Assistant Examiner(s): SMITH, ISAAC G
• Application Number:
  US13/641,632
• Publication Number:
  US 20130035820A1
• Time in Patent Office: 1,398 Days
• Field of Search: 701/22, 701/50, 180/65.285
• US Class Current: 701/22
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• 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 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• CPC Class Codes: E02F 9/2235 including an electronic controller
• CPC Class Codes: E02F 9/2242 including an electronic controller
• CPC Class Codes: E02F 9/2282 Systems using center bypass type changeover valves
• CPC Class Codes: E02F 9/2285 Pilot-operated systems
• CPC Class Codes: E02F 9/2292 Systems with two or more pumps
• CPC Class Codes: E02F 9/2296 Systems with a variable displacement pump
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A hybrid construction machine includes a distribution ratio setting unit that reduces an output distribution ratio of a motor generator by controlling an output control mechanism for controlling the output distribution ratio of the motor generator relative to an engine and increases an output distribution ratio of the engine by an amount corresponding to a reduction in the output distribution ratio of the motor generator when a temperature of a battery is lower than a threshold value in a low-temperature region or higher than a threshold value in a high-temperature region, and a regeneration amount control unit that reduces a hydraulic regeneration amount for the hydraulic motor by controlling an input control mechanism for controlling the hydraulic regeneration amount for the hydraulic motor when the temperature of the battery is lower than the threshold value in the low-temperature region or higher than the threshold value in the high-temperature region.

Claims

1. A hybrid construction machine, comprising:

a main pump;

an engine for driving the main pump;

an assist pump connected to a discharge side of the main pump via a joint passage;

a hydraulic motor rotated by return oil from an actuator;

a motor generator linked to the assist pump and the hydraulic motor;

an output control mechanism for controlling an output distribution ratio of the motor generator relative to the engine;

an input control mechanism for controlling a hydraulic regeneration amount for the hydraulic motor;

a battery associated with chemical reaction and connected to the motor generator;

a temperature detection unit that detects the temperature of the battery;

a determination unit that determines whether or not the temperature of the battery is lower than a threshold value in a low-temperature region or higher than a threshold value in a high-temperature region;

a distribution ratio setting unit that reduces the output distribution ratio of the motor generator by controlling the output control mechanism and increases an output distribution ratio of the engine by an amount corresponding to a reduction in the output distribution ratio of the motor generator when the temperature of the battery is lower than the threshold value in the low-temperature region or higher than the threshold value in the high-temperature range; and

a regeneration amount control unit that reduces the hydraulic regeneration amount for the hydraulic motor by controlling the input control mechanism when the temperature of the battery is lower than the threshold value in the low-temperature region or higher than the threshold value in the high-temperature region.

2. The hybrid construction machine according to claim 1, wherein:

the input control mechanism is a flow controlling electromagnetic valve provided in a passage connecting the actuator and the hydraulic motor.

3. The hybrid construction machine according to claim 1, wherein:

the hydraulic motor is a variable-displacement motor; and

the input control mechanism is a tilting angle controller for controlling an tilting angle of the hydraulic motor.

4. The hybrid construction machine according to claim 1, wherein:

the input control mechanism includes a flow controlling electromagnetic valve provided in a passage connecting the actuator and the hydraulic motor and a tilting angle controller for controlling an tilting angle of the hydraulic motor.

5. The hybrid construction machine according to claim 1, wherein:

the output control mechanism controls a rotational speed of the motor generator.

6. The hybrid construction machine according to claim 1, wherein:

the assist pump is a variable-displacement pump; and

the output control mechanism is a tilting angle controller for controlling an tilting angle of the assist pump.

7. The hybrid construction machine according to claim 1, further comprising:

a battery charge control unit that limits or zeroing a battery charge amount by controlling a battery charger when the temperature of the battery is lower than the threshold value in the low-temperature region or higher than the threshold value in the high-temperature region.