# US 7,745,947 B2 · Hybrid working machine

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- Number: US 7,745,947 B2
- Document ID: US7745947B2
- Status: Granted
- Kind: B2
- Application number: 11/875,340
- Filed: 2007-10-19
- Published: 2008-04-24
- Granted: 2010-06-29
- Earliest claimed: 2006-10-20
- Assignees: Kobelco Construction Machinery Co., Ltd.
- Inventors: Masayuki Komiyama; Masayuki Kagoshima
- Web page: https://patentgrep.com/patent/US7745947B2

## CPC

- B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand
- B60K 6/48: Parallel type
- B60K 6/543: the transmission being a continuously variable transmission
- B60L 1/003: {to auxiliary motors, e.g. for pumps, compressors}
- B60L 3/0023: {Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train}
- 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
- B60L 50/16: with provision for separate direct mechanical propulsion
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- E02F 9/2075: {of the hybrid type (for vehicles in general B60W20/00)}
- 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)}
- B60L 2200/40: Working vehicles
- B60L 2240/421: Speed
- B60L 2240/423: Torque
- B60L 2240/441: Speed
- B60L 2250/24: by lever actuation
- B60L 2250/26: by pedal actuation
- B60W 2540/10: Accelerator pedal position
- B60W 2710/0644: Engine speed
- B60W 2710/081: Speed
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 10/72: Electric energy management in electromobility
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present invention is to drive a hydraulic pump and a generator motor by an engine, to electrically charge a battery by a generator action of the generator motor, and to drive the generator motor by electric power of the battery so as to assist the engine. A governor position is changed by operations of a potentiometer for accelerator and a mode selection switch so as to control rotation speed of the engine. On the premise of the above configuration, generator output is limited by a controller at the time of accelerating the engine until the rotation speed of the engine reaches set speed determined on the basis of the operations of the potentiometer for accelerator and the mode selection switch, and hence engine load is reduced so as to assist acceleration.

## Claims

### Claim 1

A hybrid working machine, comprising:
a hydraulic pump for driving a hydraulic actuator;
a generator motor for performing a generator action and a motor action;
an engine serving as a common power source for said hydraulic pump and said generator motor;
an electric storage device electrically charged by the generator action of said generator motor, the electric storage device being configured such that said generator motor is driven by electric power of the electric storage device so as to perform the motor action;
accelerator operating means for changing a fuel injection amount so as to control rotation speed of said engine; and
generator output controlling means for controlling generator output of said generator motor, wherein
said generator output controlling means for limiting the generator output in a process of accelerating the rotation speed of said engine to set speed determined on the basis of the operation of said accelerator operating means.

### Claim 2 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to limit the generator output at the time of accelerating the rotation speed of said engine until the rotation speed of said engine reaches the set speed.

### Claim 3 (depends on 2)

The hybrid working machine according to claim 2, wherein
said generator output controlling means is configured so as to release the limit of the generator output before the rotation speed of said engine reaches the set speed and after the lapse of a maximum set time preset as the sufficient duration for reaching the set speed from the beginning of acceleration.

### Claim 4 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to release the limit of the generator output at the time of accelerating said engine when the rotation speed of said engine reaches the set speed and after the lapse of a minimum set time preset as the minimum necessary duration for reaching the set speed and stabilizing from the beginning of acceleration of the rotation speed of said engine.

### Claim 5 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to release the limit of the generator output at the time of accelerating the rotation speed of said engine at the earlier timing among the following:
(I) when the rotation speed of said engine reaches the set speed and after the lapse of a minimum set time preset as the minimum necessary duration for reaching the set speed and stabilizing from the beginning of acceleration of the rotation speed of said engine; and
(II) before the rotation speed of said engine reaches the set speed and after the lapse of a maximum set time preset as the sufficient duration for reaching the set speed from the beginning of said acceleration.

### Claim 6 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to limit the generator output taking target rotation speed for controlling the rotation speed of said engine preset in relation to an operation amount of said accelerator operating means as the set speed for limiting the generator output.

### Claim 7 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to limit the generator output taking speed which is smaller than and the nearest from target rotation speed for controlling the rotation speed of said engine preset in relation to an operation amount of said accelerator operating means as the set speed.

### Claim 8 (depends on 1)

The hybrid working machine according to claim 1, wherein
said generator output controlling means is configured so as to limit the generator output taking rotation speed of said engine for limiting the generator output preset in relation to an operation amount of said accelerator operating means as the set speed, aside from target rotation speed for controlling the rotation speed of said engine.