# US 2017/0282907 A1 · Construction Machine

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- Number: US 2017/0282907 A1
- Document ID: US20170282907A1
- Status: Published application
- Kind: A1
- Application number: 15/508,132
- Filed: 2015-12-03
- Published: 2017-10-05
- Earliest claimed: 2014-12-03
- Assignees: Hitachi Construction Machinery Co., Ltd.
- Applicants: Hitachi Construction Machinery Co., Ltd.
- Inventors: Katsumasa UJI; Yuichiro MORITA; Kouichi SHIBATA
- Web page: https://patentgrep.com/patent/US20170282907A1

## CPC

- B60W 20/40: Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)}
- B60W 20/13: in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60W 30/192: Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
- F02D 29/04: peculiar to engines driving pumps
- F02D 41/062: {for starting (F02D41/061 takes precedence)}
- F02N 11/0862: {characterised by the electrical power supply means, e.g. battery}
- B60K 6/485: Motor-assist type
- B60K 2006/268: {Electric drive motor starts the engine, i.e. used as starter motor}
- 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 10/26: for electrical energy, e.g. batteries or capacitors
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 50/14: Means for informing the driver, warning the driver or prompting a driver intervention
- B60W 2050/0094: {of control units}
- B60W 2300/17: Construction vehicles, e.g. graders, excavators
- B60W 2510/244: Charge state
- B60W 2510/30: Auxiliary equipments
- B60W 2540/215: Selection or confirmation of options
- E02F 9/20: Drives; Control devices (gearings in general F16H; controlling in general G05; electric multi-motor drives H02K, H02P)
- 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)}
- F02D 29/00: Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D 29/02: peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
- F02D 29/06: peculiar to engines driving electric generators
- Y02T 10/62: Hybrid vehicles
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y10S 903/903: having energy storing means, e.g. battery, capacitor
- 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
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

At the time of starting up an engine (9) using an assist motor generator (10), a main controller (28) lowers a lower limit value in a charge/discharge range of an electricity storage device (19) from a first lower limit value (min1) to a second lower limit value (min2) through an energy management control part (28B). The main controller (28) heightens the lower limit value in the charge/discharge range of an electricity storage device (19) from the second lower limit value (min2) to the first lower limit value (min1) when the start of the engine (9) is completed. Further, the main controller (28) displays engine stop prohibition information on a display device (30) when the start of the engine (9) is completed and when an SOC of the electricity storage device (19) falls below the first lower limit value (min1).

## Claims

### Claim at position 1

1-5. (canceled)

### Claim 6

A construction machine comprising:
an engine;
an electric motor connected mechanically to said engine;
a hydraulic pump connected mechanically to said engine;
an electricity storage device connected electrically to said electric motor;
a power remaining amount detecting unit that detects a power remaining amount in said electricity storage device; and
a charge/discharge range setting unit that defines a range of the power remaining amount in which a charge/discharge of said electricity storage device is made possible as a charge/discharge range, further comprising:
an engine start control device that lowers a lower limit value of the charge/discharge range defined by said charge/discharge range setting unit when said engine starts up using said electric motor, wherein
said engine start control device includes an information output unit that outputs engine stop prohibition information for a notice to an operator when it is determined whether or not said engine is during start-up,
when it is determined that said engine is during start-up, it is determined whether or not the start of said engine is completed, and
when it is determined that the start of said engine is completed and when it is determined that the power remaining amount detected by said power remaining amount detecting unit is insufficient to a power remaining amount necessary for the next engine start.

### Claim 7 (depends on 6)

The construction machine according to claim 6, wherein
said information output unit outputs the engine stop prohibition information when it is determined that the start of said engine is completed and when the power remaining amount detected by said power remaining amount detecting unit falls below the lower limit value in the charge/discharge range of said electricity storage device.

### Claim 8 (depends on 6)

The construction machine according to claim 6, wherein
said information output unit outputs the engine stop prohibition information when it is determined that the start of said engine is completed and when the power remaining amount detected by said power remaining amount detecting unit falls below a threshold value set to be lower than the lower limit value in the charge/discharge range of said electricity storage device.

### Claim 9 (depends on 6)

The construction machine according to claim 6, further comprising:
a hydraulic actuator to be driven by pressurized oil delivered from said hydraulic pump; and
a lock device for switching effectiveness and ineffectiveness of a drive command to said hydraulic actuator, wherein
said information output unit does not output the engine stop prohibition information when the drive command is effective.

### Claim 10 (depends on 9)

The construction machine according to claim 9, further comprising:
an operating device that outputs the drive command to said hydraulic actuator, wherein
said information output unit does not output the engine stop prohibition information when said operating device is in operation.