Patent application number | Description | Published |
20120205171 | CONSTRUCTION MACHINE - A construction machine that can limit consumption of battery electric power is provided. The construction machine includes: air-cooled heat exchangers | 08-16-2012 |
20130197766 | ELECTRICALLY-OPERATED CONSTRUCTION MACHINE - An electrically-operated construction machine with a battery charging operation. A lock switch provides a closed contact when a lock lever in a cab is placed in an unlock position. A feed port is disposed outside the cab to accept a cable from a commercial power source. The feed port is provided with a charge start switch . A control device has a motor control function for driving an electric motor with electrical power of a main battery when a signal is input from the lock switch. A charge control function is for charging the main battery with electrical power of the commercial power source when dictated by the charge start switch. The lock switch is wire-connected so as not to output the signal to the control device even if the closed contact is provided by the lock switch when the control device exercises charge control. | 08-01-2013 |
20130318956 | ELECTRIC CONSTRUCTION MACHINE - Provided is an electric construction machine capable of avoiding a situation where charging is difficult to achieve due to the exhaustion of a battery device. An electrically-operated hydraulic excavator includes an electric motor, a hydraulic pump that is driven by the electric motor, hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump, and a battery device that serves as an electrical power source for the electric motor. The battery device includes battery systems that each have a plurality of batteries. A selector switch makes it possible to select either one of the battery systems. An arithmetic control section of an inverter device controls connection change switches through battery controllers to change the connections of the battery systems so that electrical power is supplied to the electric motor from either the battery system or the battery system, whichever is selected by the selector switch. | 12-05-2013 |
20130325235 | ELECTROMOTIVE DRIVE DEVICE FOR CONSTRUCTION MACHINE - An electromotive drive device of an electric motor-driven mini-excavator, which is capable of lengthening its operating time, includes an electric power storage device, a motor-generator, a hydraulic pump, a plurality of directional control valves which respectively control the flow of pressurized fluid, and a plurality of operating devices which respectively operate the plurality of directional control valves. The electromotive drive device is provided with a bidirectional converter which decelerates the motor-generator to an idle revolution speed when X seconds have elapsed in a state in which the plurality of directional control valves are all not operated. The bidirectional converter performs regenerative control to convert an inertial force of a rotor of the motor-generator to power and charge the electric power storage device when it decelerates the motor-generator from a standard revolution speed to the idle revolution speed. | 12-05-2013 |
20140046552 | ELECTRIC DRIVE UNIT FOR CONSTRUCTION MACHINE - An electric drive unit for a construction machine is capable of increasing the operating time of the construction machine. The electric drive unit has an electricity storage device, a hydraulic pump of the fixed displacement type which is driven by a motor/generator, a plurality of directional control valves which respectively control the flow of hydraulic fluid supplied to a plurality of hydraulic actuators, a bidirectional converter which performs variable control on the revolution speed of the motor/generator, and an LS control device which controls the bidirectional converter so that LS differential pressure Pls equals a target value Pgr. The bidirectional converter performs regeneration control for converting the inertial force of the rotor of the motor/generator into electric power thereby charging the electricity storage device when the revolution speed of the motor/generator is decreased in response to an excess of the LS differential pressure Pls over the target value Pgr. | 02-13-2014 |
20140052350 | ELECTRIC DRIVE UNIT FOR CONSTRUCTION MACHINE - An electric drive unit for a construction machine is capable of increasing the operating time of the construction machine. The electric drive unit has an electricity storage device, a hydraulic pump of variable displacement type which is driven by a motor/generator, a regulator which performs variable control on the displacement volume of the hydraulic pump, a bidirectional converter which performs variable control on the revolution speed of the motor/generator, and an LS control device which controls the regulator and the bidirectional converter so that LS differential pressure Pls equals a target value Pgr. The bidirectional converter performs regeneration control for converting the inertial force of the rotor of the motor/generator into electric power thereby charging the electricity storage device when the revolution speed of the motor/generator is decreased in response to an excess of the LS differential pressure Pls over the target value Pgr. | 02-20-2014 |
20140117934 | ELECTRIC CONSTRUCTION MACHINE - An electric construction machine is capable of increasing a battery device charging rate in a short charging time. The battery device includes a plurality of battery systems and an inverter device which has a motor driving control function of selectively connecting one of the battery systems, converting DC power supplied from the connected battery system into AC power, and supplying the AC power to an electric motor. The inverter has a battery charging control function of selectively connecting one of the battery systems and supplying electric power from an external commercial power supply to the connected battery system. When the voltages of the battery systems are less than an upper limit value V | 05-01-2014 |
20150231974 | Electric Construction Machine - Provided is an electric construction machine adapted to prevent an electric current, after flowing in via a junction at which power transmission systems join together, from flowing into at least one connector to which an external power supply is not connected. | 08-20-2015 |