Electric power control apparatus for construction machine

• US 9,181,683 B2
• Filed: 07/10/2014
• Issued: 11/10/2015
• Est. Priority Date: 08/07/2013
• Status: Active Grant

• Current Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Original Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Inventors: Doi, Takayuki
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US14/328,138
• Publication Number:
  US 20150046003A1
• Time in Patent Office: 488 Days
• Field of Search: 701/22, 320/136, 320/150
• US Class Current: 1/1
• CPC Class Codes: B60K 1/00 Arrangement or mounting of electrical propulsion units B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/15 : Preventing overcharging
• CPC Class Codes: B60L 58/26 : by cooling
• CPC Class Codes: B60W 10/26 : for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/13 : in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 : Charge state
• CPC Class Codes: B60W 2510/246 : Temperature
• 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: H01M 10/425 : Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/44 : Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/482 : for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/486 : for measuring temperature
• CPC Class Codes: H01M 10/613 : Cooling or keeping cold
• CPC Class Codes: H01M 10/625 : Vehicles
• CPC Class Codes: H01M 10/6562 : with free flow by convection only
• CPC Class Codes: H01M 2220/20 : Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/00 : Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• 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
• CPC Class Codes: Y10S 903/903 : having energy storing means, e.g. battery, capacitor

Abstract

Provided is an electric power control apparatus capable of suppressing charge/discharge with respect to an electrical storage device under an anomalous condition. The electric power control apparatus includes an electrical storage device including electrical storage modules, a module-temperature detection section, a temperature-condition judgment section, an adopted-module-temperature selection section, and a charge/discharge-electric-power-upper-limit setting section. The temperature-condition judgment section makes a judgment on a temperature condition of the electrical storage device based on a temperature detected by an electrical-storage-device temperature detection section. The charge/discharge-electric-power-upper-limit setting section sets charge/discharge electric power upper limit of the electrical storage device, based on a module temperature (Tmin) which is deviated to a side of a non-steady temperature condition and selected by the adopted-module-temperature selection section, when the electrical storage device is judged to be under the non-steady temperature condition.

Claims

1. An electric power control apparatus for a construction machine, comprising:

a motor;

an electrical storage device which performs supply and receive of electric power with the motor, the electrical storage device including a plurality of electrical storage modules;

an electrical-storage-device temperature detector which detects a temperature relating to the electrical storage device;

a temperature-condition judgment section which judges whether the electrical storage device is under a predetermined non-steady temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

a module-temperature detection section which detects a plurality of module temperatures which are respective temperatures of the electrical storage modules;

an adopted-module-temperature selection section which selects a module temperature most deviated to a side of the non-steady temperature condition, from the module temperatures detected by the module-temperature detection section, as a adopted-module-temperature; and

a charge/discharge-electric-power-upper-limit setting section which sets an upper limit of charge electric power and an upper limit of discharge electric power of the electrical storage device, based on the adopted-module-temperature selected by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the non-steady temperature condition, wherein;

the non-steady temperature condition on which the temperature-condition judgment section makes a judgment includes a low temperature condition, under which the temperature detected by the electrical-storage-device temperature detector is lower than a predetermined temperature; and

the adopted-module-temperature selection section selects a lowest module temperature corresponding to a lowest temperature of the module temperatures detected by the module-temperature detection section, as the adopted-module-temperature, when the temperature-condition judgment section judges that the electrical storage device is under the low temperature condition.

2. An electric power control apparatus for a construction machine, comprising:

a motor;

an electrical storage device which performs supply and receive of electric power with the motor, the electrical storage device including a plurality of electrical storage modules;

an electrical-storage-device temperature detector which detects a temperature relating to the electrical storage device;

a temperature-condition judgment section which judges whether the electrical storage device is under a predetermined non-steady temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

a module-temperature detection section which detects a plurality of module temperatures which are respective temperatures of the electrical storage modules;

an adopted-module-temperature selection section which selects a module temperature most deviated to a side of the non-steady temperature condition, from the module temperatures detected by the module-temperature detection section, as an adopted-module-temperature; and

a charge/discharge-electric-power-upper-limit setting section which sets an upper limit of charge electric power and an upper limit of discharge electric power of the electrical storage device, based on the adopted-module-temperature selected by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the non-steady temperature condition, wherein;

the non-steady temperature condition to be determined by the temperature-condition judgment section includes a high temperature condition, under which the temperature detected by the electrical-storage-device temperature detector is higher than a predetermined temperature; and

the adopted-module-temperature selection section selects a highest module temperature corresponding to a highest temperature of the module temperatures detected by the module-temperature detection section, as the adopted-module-temperature, when the temperature-condition judgment section judges that the electrical storage device is under the high temperature condition.

3. An electric power control apparatus for a construction machine, comprising:

a motor;

an electrical storage device which performs supply and receive of electric power with the motor, the electrical storage device including a plurality of electrical storage modules;

an electrical-storage-device temperature detector which detects a temperature relating to the electrical storage device;

a temperature-condition judgment section which judges whether the electrical storage device is under a predetermined non-steady temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

a module-temperature detection section which detects a plurality of module temperatures which are respective temperatures of the electrical storage modules;

an adopted-module-temperature selection section which selects a module temperature most deviated to a side of the non-steady temperature condition, from the module temperatures detected by the module-temperature detection section, as an adopted-module-temperature; and

a charge/discharge-electric-power-upper-limit setting section which sets an upper limit of charge electric power and an upper limit of discharge electric power of the electrical storage device, based on the adopted-module-temperature selected by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the non-steady temperature condition, wherein;

the temperature-condition judgment section judges whether the electrical storage device is under a predetermined ordinary temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

the adopted-module-temperature selection section calculates an average module temperature which is an average of the module temperatures detected by the module-temperature detection section, and to select the average module temperature as the adopted-module-temperature, when the temperature-condition judgment section judges that the electrical storage device is under the ordinary temperature condition; and

the charge/discharge-electric-power-upper-limit setting section sets the upper limit of charge electric power and the upper limit of discharge electric power of the electrical storage device, based on the average module temperature calculated by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the ordinary temperature condition.

4. An electric power control apparatus for a construction machine, comprising:

a motor;

an electrical storage device which performs supply and receive of electric power with the motor, the electrical storage device including a plurality of electrical storage modules;

an electrical-storage-device temperature detector which detects a temperature relating to the electrical storage device;

a temperature-condition judgment section which judges whether the electrical storage device is under a predetermined non-steady temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

a module-temperature detection section which detects a plurality of module temperatures which are respective temperatures of the electrical storage modules;

an adopted-module-temperature selection section which selects a module temperature most deviated to a side of the non-steady temperature condition, from the module temperatures detected by the module-temperature detection section, as an adopted-module-temperature; and

a charge/discharge-electric-power-upper-limit setting section which sets an upper limit of charge electric power and an upper limit of discharge electric power of the electrical storage device, based on the adopted-module-temperature selected by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the non-steady temperature condition, wherein;

the temperature to be detected by the electrical-storage-device temperature detector is an average module temperature which is an average of the module temperatures detected by the module-temperature detection section; and

the temperature-condition judgment section stores a condition judgment threshold value for a judgment on a temperature condition of the electrical storage device and makes the judgment on the temperature condition of the electrical storage device by comparing the average module temperature detected by the electrical-storage-device temperature detector with the condition judgment threshold value.

5. An electric power control apparatus for a construction machine, comprising;

a motor;

an electrical storage device which performs supply and receive of electric power with the motor, the electrical storage device including a plurality of electrical storage modules;

an electrical-storage-device temperature detector which detects a temperature relating to the electrical storage device;

a temperature-condition judgment section which judges whether the electrical storage device is under a predetermined non-steady temperature condition, based on the temperature detected by the electrical-storage-device temperature detector;

a module-temperature detection section which detects a plurality of module temperatures which are respective temperatures of the electrical storage modules;

an adopted-module-temperature selection section which selects a module temperature most deviated to a side of the non-steady temperature condition, from the module temperatures detected by the module-temperature detection section, as an adopted-module-temperature;

a charge/discharge-electric-power-upper-limit setting section which sets an upper limit of charge electric power and an upper limit of discharge electric power of the electrical storage device, based on the adopted-module-temperature selected by the adopted-module-temperature selection section, when the temperature-condition judgment section judges that the electrical storage device is under the non-steady temperature condition; and

a fluid cooling device adapted to cool the electrical storage device by cooling fluid, wherein;

the electrical-storage-device temperature detector detects a temperature of the cooling fluid which is cooling the electrical storage device or which has cooled the electrical storage device; and

the temperature-condition judgment section stores a condition judgment threshold value for an judgment on the temperature condition of the electrical storage device and makes the judgment on the temperature condition of the electrical storage device by comparing the temperature of the cooling fluid detected by the electrical-storage-device temperature detector with the condition judgment threshold value.

6. The electric power control apparatus according to claim 5, wherein:

the fluid cooling device is adapted to cool the electrical storage device by cooling air flowed inside the electrical storage device, and the electrical-storage-device temperature detector detects an internal ambient temperature of the electrical storage device or a temperature of the cooling air discharged to an outside of the electrical storage device.

7. The electric power control apparatus according to claim 5, wherein the fluid cooling device is adapted to cool the electrical storage device by cooling water, and the electrical-storage-device temperature detector detects a temperature of the cooling water which is cooling the electrical storage device or which has cooled the electrical storage device.