# US 2012/0233995 A1 · Hybrid operating machine

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- Number: US 2012/0233995 A1
- Document ID: US20120233995A1
- Status: Published application
- Kind: A1
- Application number: 13/512,850
- Filed: 2011-04-22
- Published: 2012-09-20
- Earliest claimed: 2010-05-20
- Assignees: Kayaba Industry Co., Ltd.
- Inventors: Haruhiko Kawasaki; Masahiro Egawa
- Web page: https://patentgrep.com/patent/US20120233995A1

## CPC

- E02F 9/2217: {with energy recovery arrangements, e.g. using accumulators, flywheels}
- E02F 9/2075: {of the hybrid type (for vehicles in general B60W20/00)}
- E02F 9/2235: {including an electronic controller}
- E02F 9/2282: {Systems using center bypass type changeover valves}
- E02F 9/2285: {Pilot-operated systems}
- E02F 9/2292: {Systems with two or more pumps}
- E02F 9/2296: {Systems with a variable displacement pump}
- F15B 2211/20515: Electric motor
- F15B 2211/20523: Internal combustion engine
- F15B 2211/20576: with multiple pumps
- F15B 2211/265: Control of multiple pressure sources
- F15B 2211/88: Control measures for saving energy
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

A controller determines whether or not a control valve for controlling the supply of pressure fluid from a main pump to an actuator is at a neutral position, detects input power of a hydraulic motor rotated by return oil from the actuator, and narrows the opening of a proportional electromagnetic throttle valve when the control valve is at the neutral position and the input power of the hydraulic motor is in excess of a first threshold value.

## Claims

### Claim 1

A hybrid operating machine, comprising:
a main pump;
an engine which drives the main pump;
a variable-capacity assist pump connected to a discharge side of the main pump via a joint passage;
a tilting angle controller which controls a tilting angle of the assist pump,
a proportional electromagnetic throttle valve provided in the joint passage;
an actuator;
a control valve which controls the supply of pressure fluid from the main pump to the actuator;
a variable-capacity hydraulic motor which is rotated by return oil from the actuator;
a motor generator connected to the assist pump and the hydraulic motor;
a battery connected to the motor generator; and
a controller which is connected to the tilting angle controller and the proportional electromagnetic throttle valve, determines whether or not the control valve is at a neutral position, detects input power of the hydraulic motor rotated by the return oil from the actuator and narrows the opening of the proportional electromagnetic throttle valve when the control valve is at the neutral position and the input power of the hydraulic motor is in excess of a first threshold value.

### Claim 2 (depends on 1)

The hybrid operating machine according to claim 1, wherein:
the controller narrows the opening of the proportional electromagnetic throttle valve and controls the tilting angle controller to increase the tilting angle of the assist pump when the input power of the hydraulic motor is in excess of the first threshold value.

### Claim 3 (depends on 1)

The hybrid operating machine according to claim 1, wherein:
the controller controls the tilting angle controller to maximize the tilting angle of the assist pump and closes the proportional electromagnetic throttle valve when power to the hydraulic motor is in excess of a second threshold value smaller than the first threshold value after the elapse of a set time following the narrowing of the opening of the proportional electromagnetic throttle valve.