CONTROL SYSTEM OF HYBRID CONSTRUCTION MACHINE

• US 20160312443A1
• Filed: 12/02/2014
• Published: 10/27/2016
• Est. Priority Date: 01/24/2014
• Status: Abandoned Application

• Current Assignee: KYB Corp.
• Original Assignee: KYB Corp.
• Inventors: EGAWA, Masahiro, KAWASAKI, Haruhiko
• Application Number:
  US15/103,346
• Publication Number:
  US 20160312443A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: B60Y 2300/437 Control of engine valves
• CPC Class Codes: B60Y 2300/54 Engine overload, high loads on engine
• CPC Class Codes: B60Y 2300/55 Engine low load mode
• CPC Class Codes: B60Y 2400/14 Hydraulic energy storages, e.g. hydraulic accumulators
• CPC Class Codes: B60Y 2400/301 for position or displacement
• CPC Class Codes: B60Y 2400/306 Pressure sensors
• CPC Class Codes: B60Y 2400/406 Hydraulic actuators
• CPC Class Codes: B60Y 2400/60 Electric Machines, e.g. motors or generators
• CPC Class Codes: E02F 9/0875 Arrangement of valve arrangements on superstructures arrangement of hydraulic hoses E02F9/2275 takes precedence; valves per se E02F9/2267
• 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 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• CPC Class Codes: E02F 9/226 Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• CPC Class Codes: E02F 9/2267 Valves or distributors position of valves arrangements on upper-structures E02F9/0875
• CPC Class Codes: E02F 9/2271 Actuators and supports therefor and protection therefor
• CPC Class Codes: E02F 9/2282 Systems using center bypass type changeover valves
• 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: E02F 9/267 : Diagnosing or detecting failure of vehicles
• CPC Class Codes: F15B 21/14 : Energy-recuperation means
• CPC Class Codes: F15B 2211/40515 : with variable throttles or orifices
• CPC Class Codes: F15B 2211/41527 : being connected to an output member and a directional control valve
• CPC Class Codes: F15B 2211/426 : electrically or electronically
• CPC Class Codes: F15B 2211/50554 : the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
• CPC Class Codes: F15B 2211/6313 : the pressure being a load pressure
• CPC Class Codes: F15B 2211/6658 : Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode
• CPC Class Codes: F15B 2211/7053 : Double-acting output members
• CPC Class Codes: F15B 2211/7058 : Rotary output members
• CPC Class Codes: F15B 2211/7135 : Combinations of output members of different types, e.g. single-acting cylinders with rotary motors

Abstract

A control system of a hybrid construction machine includes a main pump for discharging working fluid and driving an actuator, a regeneration motor driven by the working fluid discharged from the actuator through a first regeneration passage, a rotational electric machine drivable by the regeneration motor, and a regeneration passage switching valve having a tank communication position that allows the first regeneration passage to communicate with a tank when a flow-in amount of the working fluid inside the first regeneration passage into the regeneration motor exceeds a defined value.

Claims

1. A control system of a hybrid construction machine, comprising:

a main pump configured to discharge working fluid and drive an actuator;

a regeneration motor configured to be driven by the working fluid discharged from the actuator through a first regeneration passage;

a rotational electric machine drivable by the regeneration motor; and

a regeneration passage switching valve having a tank communication position that allows the first regeneration passage to communicate with a tank when a flow-in amount of the working fluid inside the first regeneration passage into the regeneration motor exceeds a defined value.

2. The control system of the hybrid construction machine according to claim 1, further comprising:

a pressure detector configured to detect a pressure of the working fluid guided to the regeneration motor;

a solenoid valve configured to be switchable to supply a pilot pressure for switching the regeneration passage switching valve to the tank communication position; and

a controller configured to output a signal for switching the solenoid valve to supply the pilot pressure when a pressure detected by the pressure detector reaches a pressure within the defined value.

3. The control system of the hybrid construction machine according to claim 1, wherein

the regeneration passage switching valve is switched to the tank communication position even when the inside of the first regeneration passage becomes a negative pressure.

4. The control system of the hybrid construction machine according to claim 1, further comprising:

a circuitry system having an operation valve for supplying and discharging the working fluid supplied from the main pump to the actuator via a main passage;

a main relief valve configured to maintain a working fluid pressure of the main passage to not more than a main relief pressure; and

a second regeneration passage branched out between the main pump and the operation valve of the main passage and connected to the first regeneration passage, wherein

the regeneration passage switching valve has a regeneration position that allows the second regeneration passage to communicate with the first regeneration passage when the working fluid pressure of the main passage reaches a set pressure lower than the main relief pressure while the actuator is being operated.

5. The control system of the hybrid construction machine according to claim 4, further comprising:

a throttle connected downstream of the operation valve of the main passage, the throttle being configured to generate a pilot pressure transmitted to a regulator for controlling a capacity of the main pump; and

a main passage switching valve interposed between the operation valve and the throttle in the main passage, capable of opening and closing the main passage, wherein

the main passage switching valve is switched to a closed position when the regeneration passage switching valve is switched to the regeneration position.