Patent application number | Description | Published |
20090301075 | Control Apparatus for Work Machine - A speed of a hydraulic actuator is matched with that of an electric actuator when the hydraulic actuator and the electric actuator are concurrently actuated. When determination units ( | 12-10-2009 |
20090320461 | CONTROL DEVICE OF ENGINE, CONTROL DEVICE OF ENGINE AND HYDRAULIC PUMP, AND CONTROL DEVICE OF ENGINE, HYDRAULIC PUMP, AND GENERATOR MOTOR - An object of the present invention is to operate the working machine etc. with satisfactory responsiveness as intended by the operator while enhancing engine efficiency, pump efficiency, and the like, where a first engine target revolution ncom | 12-31-2009 |
20100031650 | CONSTRUCTION MACHINE AND METHOD OF CONTROLLING CONSTRUCTION MACHINE - The present invention provides a construction machine where overheating of mounted electric devices can be prevented properly with a simple structure and a method of controlling the construction machine. For this purpose, a pump target discharge flow rate of a hydraulic pump is calculated based on an operated amount of an operating unit, a temperature of an electric device mounted on the construction machine is detected, an engine minimum speed, which is a minimum possible speed of an engine in carrying out low-speed matching for matching output of the engine and pump absorbing horsepower of the hydraulic pump to each other in a low-speed region where speed of the engine is lower than set speed, is calculated by using the detected temperature of the electric device, and a maximum value out of a corresponding speed of the pump target discharge flow rate and the engine minimum speed is generated as a candidate for an engine target speed. | 02-11-2010 |
20100064677 | WORK MACHINE - A work machine includes: hydraulic actuators | 03-18-2010 |
20100071973 | METHOD OF CONTROLLING HYBRID CONSTRUCTION MACHINE AND HYBRID CONSTRUCTION MACHINE - A method of controlling a hybrid construction machine capable of preventing a system from being rendered inoperative without increasing a capacitance of a capacitor and of inhibiting delay of a swing operation relative to an operation command at the time of swing operation, and the hybrid construction machine are provided. For this purpose, at the time of discharge of the capacitor, actual torque command values are respectively generated by referring to an assist torque limit value corresponding to capacitor voltage of a generator motor and a swing power running torque limit value corresponding to the capacitor voltage of a swing motor, as well as, at the time of charge of the capacitor, an actual target output value of the generator motor is generated. | 03-25-2010 |
20100097037 | POWER GENERATION CONTROL METHOD OF HYBRID CONSTRUCTION MACHINE AND HYBRID CONSTRUCTION MACHINE - A power generation control method of a hybrid construction machine capable of maintaining voltage of a capacitor in an appropriate range while minimizing capacitance of the capacitor and of surely preventing a system from being rendered inoperative, and the hybrid construction machine are provided. For this purpose, swing power corresponding to electric power consumed by a swing motor for swinging a part of a body relative to other parts is sequentially calculated, a value of the calculated swing power is converted to a smaller value, a power generation command of a generator motor is sequentially generated using the converted value, and the generated power generation command is output to an inverter for driving the generator motor. | 04-22-2010 |
20130073111 | Control Device for an Electric Actuator - A control device of an electric actuator adapted to perform a forward-reverse movement includes a control unit adapted to be operated in a forward direction or a reverse direction in accordance with the forward-reverse movement of the electric actuator. It also includes a pilot circuit, which is connected to the control unit and which generates a forward pilot pressure or a reverse pilot pressure in accordance with the forward operation or the reverse operation of the control unit. The control device has a differential pressure acquiring unit that acquires a differential pressure between a pilot pressure corresponding to an operation direction of the control unit and a pilot pressure, in a direction opposite to the operation direction, and it has a control command generator that generates a control command for controlling the electric actuator based on the differential pressure acquired by the differential pressure acquiring unit. The control device includes a drive controller for controlling a drive of the electric actuator based on the generated control command. | 03-21-2013 |
20140054902 | ENGINE CONTROL DEVICE OF WORK MACHINE AND ENGINE CONTROL METHOD THEREFOR - An engine control device is provided including: detection units for detecting a driving state of a work machine using a generator, target engine speed setting units for causing, on the basis of the driving state, a target engine speed set for a case where electric power generation by the generator is OFF to be the same as a target engine speed set for a case where the electric power generation by the generator is ON, and engine target output calculation units for calculating an engine target output during electric power generation OFF that can be output at most when the electric power generation by the generator is OFF, and calculates an engine target output obtained by adding an output corresponding to an electric power generation amount by the generator to the engine target output when the electric power generation by the generator is ON. | 02-27-2014 |
20140084831 | CONTROL DEVICE AND METHOD FOR CONTROLLING ELECTRIC MOTOR - A control device of an electric motor includes: an operating state setting unit configured to set an operating state; a maximum output acquiring unit configured to acquire maximum output of the electric motor that is preset according to the operating state set; a speed detecting unit configured to detect a speed of the electric motor; a torque limit value calculating unit configured to calculate a torque limit value based on the speed and the maximum output; and a torque limiting unit configured to limit torque of the electric motor by the torque limit value when accelerating the electric motor. | 03-27-2014 |
20140188373 | ENGINE CONTROL DEVICE OF WORK MACHINE AND ENGINE CONTROL METHOD THEREFOR - It is determined that assisting is required when a deviation of a target matching engine speed and a current engine speed is equal to or more than a predetermined value, and for a predetermined period of time since the time point at which it is determined that assisting is required, a target assist engine speed is set at a high rotation target matching engine speed which is more than the target matching engine speed, and thereafter the target assist engine speed is set gradually closer to the target matching engine speed, and an assist torque command value is output to the generator assisting output of the engine, and the engine speed is controlled, so that the engine speed attains the target assist engine speed. | 07-03-2014 |
20140200795 | ENGINE CONTROL DEVICE OF WORKING MACHINE, AND ENGINE CONTROL METHOD FOR THE SAME - An engine control device is provided including a detection unit for detecting the operating state of a working machine; a no-load maximum speed computation unit for computing a no-load maximum speed being an engine speed to be increased to the maximum upon a load of the working machine being released, based on the operating state; a target matching speed computation unit for computing a target matching speed being an engine speed to be increased upon a load being applied to the working machine, separately from the no-load maximum speed, based on the operating state; a target engine output computation unit for computing target engine output EL that can be outputted to the maximum, based on the operating state; and an engine control unit for controlling the engine speed between the no-load maximum speed and the target matching speed under a restriction of the target engine output. | 07-17-2014 |
20140214250 | BATTERY CHARGE/DISCHARGE CONTROL DEVICE, BATTERY CHARGE/DISCHARGE CONTROL METHOD, AND HYBRID WORKING MACHINE WITH BATTERY CHARGE/DISCHARGE CONTROL DEVICE - A battery charge/discharge control device which performs battery charge/discharge control in a working machine with a battery capable of storing electric energy generated by a generator motor coupled to an engine and driving the generator motor or at least one of other electric actuators by the stored electric energy and a controller which controls a distribution of the electric energy among the battery, the generator motor, and the electric actuator, wherein the controller performs the charge/discharge control in which the electric energy of the battery is discharged when the engine is driven and recharging to the battery is permitted on a condition that a state in which an engine speed is equal to or lower than a predetermined engine speed is maintained for a predetermined time after the battery is completely discharged. | 07-31-2014 |
20140230785 | ENGINE CONTROL APPARATUS AND CONSTRUCTION MACHINE - An engine control apparatus for controlling an engine which drives a hydraulic pump to discharge operation oil, the engine control apparatus includes: a pump driving power limit unit configured to limit pump driving power, which is power used to drive the hydraulic pump, based on pressure of the operation oil discharged by the hydraulic pump when in a state in which a part of the operation oil discharged by the hydraulic pump is released because pressure of the operation oil discharged by the hydraulic pump has become equal to or higher than preset relief pressure; and an engine output control unit configured to control output of the engine so that target speed, which is speed of the engine set as a target, becomes equal to or higher than a value of a point of time when limiting of the pump driving power is started. | 08-21-2014 |
20150081147 | HYBRID WORKING MACHINE AND METHOD OF CONTROLLING HYBRID WORKING MACHINE - A hybrid excavator includes an engine, a generator motor, a capacitor, a swing motor, a transformer, a transformer temperature sensor, a capacitor temperature sensor, and a hybrid controller. An overheat suppression control unit of the hybrid controller changes the amount of power regenerated by the swing motor supplied to the capacitor and the amount of power regenerated by the swing motor supplied to the generator motor based on a temperature of the transformer detected by the transformer temperature sensor and a temperature of the capacitor detected by the capacitor temperature sensor. | 03-19-2015 |
20150135693 | ENGINE CONTROL APPARATUS FOR WORK MACHINE AND ENGINE CONTROL METHOD THEREOF - The present invention includes an information generator to set a lever manipulation amount total sum decrease flag during a period when a lever manipulation amount total sum is decreasing, a first processor to process an engine actual output, an engine actual output latching function block to output the maximum value of the engine actual output until the present during a period in which a lever manipulation amount total sum decrease flag is not set, and output the present engine actual output during a period in which the flag is set, a second processor to output an engine target output based on the engine output, and a controller to control the engine speed under limitation of the engine target output. | 05-21-2015 |
20150202979 | BATTERY CHARGE/DISCHARGE CONTROL DEVICE, BATTERY CHARGE/DISCHARGE CONTROL METHOD, AND HYBRID WORKING MACHINE WITH BATTERY CHARGE/DISCHARGE CONTROL DEVICE - A battery charge/discharge control device which performs battery charge/discharge control in a working machine with a battery capable of storing electric energy generated by a generator motor coupled to an engine and driving the generator motor or at least one of other electric actuators by the stored electric energy and a controller which controls a distribution of the electric energy among the battery, the generator motor, and the electric actuator, wherein the controller performs the charge/discharge control in which the electric energy of the battery is discharged when the engine is driven and recharging to the battery is permitted on a condition that a state in which an engine speed is equal to or lower than a predetermined engine speed is maintained for a predetermined time after the battery is completely discharged. | 07-23-2015 |
Patent application number | Description | Published |
20090235242 | IMAGE FORMING APPARATUS, REMOTE UPDATE VERIFICATION METHOD THEREFOR AND STORAGE MEDIUM - An image forming apparatus which is capable of more reliably ensuring the operation of the apparatus having software files therein updated remotely and reducing an operational burden on the user. A ROM stores a plurality of software files. A scanner section and a printer section execute functions provided by the image forming apparatus, using the software files. An NIC section receives an update software file for updating at least one of the software files from an image processing apparatus. After a software file is updated based on the update software file received by the NIC section, a function using the updated software file is executed, a core section causes the image forming apparatus to operate in an functional check mode for checking operation of the executed function. | 09-17-2009 |
20090285586 | APPARATUS AND METHOD OF CONTROLLING INTERCHANGE BETWEEN COMPONENT PARTS IN THE APPARATUS - An apparatus which is capable of substantially prolonging the service live of each component part and preventing the degradation of apparatus specifications before and after parts interchange work by the user. A controller of the image forming apparatus detects a component part requiring interchange from among the component parts based on wear ratios of the respective component parts. The controller determines whether or not to interchange the component part requiring interchange with another component part, based on the wear ratios of the respective component parts and usage rate of the respective component positions. When it is determined that the component part requiring interchange should be interchanged with another component part, the image forming apparatus issues a parts interchange notification. | 11-19-2009 |
20110125931 | WIRELESS CONNECTION SYSTEM THAT CONNECTS HOST AND DEVICES BY RADIO, INITIAL CONNECTION METHOD THEREFOR, STORAGE MEDIUM THAT STORES CONTROL PROGRAM THEREFOR, INFORMATION PROCESSING APPARATUS AND IMAGE FORMING APPARATUS THAT CONSTITUTE THE SYSTEM - A wireless connection system capable of reducing a load on a user when constructing wireless connection environment including a host and devices. A wireless connection system comprises a host computer, a first device that has established a wireless connection with the host computer based on first association information, and a second device that has not established the wireless connection with the host computer. The host computer generates second association information for the wireless connection with the second device, and transmits the second association information to the first device by radio. The first device stores the second association information into a removable memory device when equipped with the removable memory device. The second device acquires the second association information from the removable memory device when equipped with the removable memory device that stores the second association information, and communicates with the host computer by radio based on the second association information. | 05-26-2011 |
20120140287 | PRINTING APPARATUS, DATA STORAGE METHOD, AND PROGRAM - A printing apparatus having a reprint function includes a determination unit to determine whether newly input print data are able to be stored in an empty area of a data storage area, a selection unit to, if the determination unit determines that the newly input print data are not able to be stored in the empty area of the data storage area, select print data that matches a priority deletion condition from among print data pieces that have already been stored, a change unit to change, among deletion order information indicating a deletion order of the print data pieces stored in the data storage area, a deletion order corresponding to the print data selected by the selection unit, a deletion unit to delete corresponding print data based on the deletion order information, and a storage unit configured to store the newly input print data in the empty area. | 06-07-2012 |
20150153973 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus includes execution units configured to execute predetermined functional processing, and switches to a second power state lower than a first power state. After a user selects priority on power saving or priority on convenience as a condition for switching to the second power state, the image forming apparatus receives a plurality of recovery triggers for switching to the first power state. A number of times of detection of each recovery trigger received is stored. If the user selects priority on convenience, it is determined whether the number of times of detection of each recovery trigger requiring a large power amount consumed by execution units associated with each recovery trigger falls below a predetermined threshold. If it is determined that the number of times of detection of a recovery trigger falls below the predetermined threshold, the recovery trigger may be disabled. | 06-04-2015 |