Patent application number | Description | Published |
20110112712 | CARGO HANDLING CONTROLLER FOR CARGO HANDLING VEHICLE - A cargo handling controller includes a rotation speed setting unit, an engine control unit, a memory, a rotation speed detection unit, a deviation calculator, an assistance amount setting unit, and a generator-motor control unit. The deviation calculator calculates a deviation of a feedback control rotation speed, which is determined from a target engine rotation speed stored in the memory a predetermined time earlier, and an actual rotation speed of the generator-motor, which is detected by the rotation speed detection unit. The assistance amount setting unit obtains a generator-motor assistance amount in accordance with the deviation. The generator-motor control unit sends a drive signal that is in accordance with the generator-motor assistance amount to the generator-motor. | 05-12-2011 |
20110118922 | DRIVE CONTROLLER FOR CARGO HANDLING VEHICLE - A drive controller for a cargo handling vehicle including an engine, a generator motor, a cargo handling pump, a cargo handling actuator, a travel motor, and a battery. The drive controller includes an engine control unit, a rotation speed detection unit, a deviation calculation unit, and a power generation control unit. The engine control unit controls the engine in accordance with a command rotation speed. The rotation speed detection unit detects an actual rotation speed of the engine. The deviation calculation unit calculates a rotation speed deviation of the command rotation speed for the engine and the actual rotation speed of the engine. The power generation control unit controls the generator motor in accordance with the rotation speed deviation so as to limit power generated by the generator motor to drive the travel motor. | 05-19-2011 |
20110128662 | POWER SUPPLY CONTROL APPARATUS - A power supply control apparatus for controlling a power supply unit including a battery and a load is provided. The power supply control apparatus includes a main relay and a ground relay, a pre-charge relay, an inrush current limiting resistor, a first relay control section, and a time measurement section. The main relay and the ground relay are connected between the battery and the load. The pre-charge relay is connected in parallel with one of the main relay and the ground relay. The inrush current limiting resistor is connected in series with the pre-charge relay, and limits an inrush current from the battery to the load. The first relay control section temporarily turns ON the pre-charge relay and turns ON the main relay and the ground relay upon receiving a power supply connection request from the outside, and turns OFF the main relay and the ground relay upon receiving a power supply interruption request from the outside. The time measurement section chooses a time point in the period from when the pre-charge relay is turned ON to when it is turned OFF, and measures the elapsed time from the chosen time point. Before the elapsed time measured by the time measurement section reaches a predetermined reference period, the first relay control section does not turn OFF the main relay and the ground relay, but maintains the relays ON, even when receiving the power supply interruption request. | 06-02-2011 |
20110137502 | HYBRID INDUSTRIAL VEHICLE - A hybrid industrial vehicle including an engine, generator motor, battery, and a travel motor. A first generated power computation unit computes a deceleration rate based required generated power based on the travel power and charge power of the battery. A second generated power computation unit computes an actual power based required generated power based on used power used by the travel motor and the charge power of the battery. A generated power control unit controls the generator motor so that the generated power of the generator motor becomes equal to a total generated power determined from the deceleration rate based required generated power and actual power based required generated power. An engine rotation speed control unit controls rotation speed of the engine to be greater than or equal to a required cargo handling engine rotation speed. | 06-09-2011 |
20110137503 | TRAVEL CONTROLLER FOR INDUSTRIAL VEHICLE - A travel controller for a hybrid forklift includes an acceleration command reference value generation unit, an acceleration limit value generation unit, an acceleration command value determination unit, and a travel motor control unit. The acceleration command reference value generation unit obtains an acceleration command reference value. The acceleration limit value generation unit obtains an acceleration limit value that limits an acceleration command value to a range that prevents discharge power of the battery from exceeding a battery discharge power limit value. The acceleration command value determination unit determines the acceleration command value for the travel motor from the acceleration command reference value and the acceleration limit value. The travel motor control unit controls the travel motor with the acceleration command value. | 06-09-2011 |
20140331659 | INDUSTRIAL VEHICLE AND METHOD FOR CONTROLLING INDUSTRIAL VEHICLE - An industrial vehicle includes a hydraulic mechanism, an operation lever, and a pump, a hydraulic control valve unit, a lever operation detector, an internal combustion engine controller, and a valve controller that controls the hydraulic control valve unit. When the lever operation detector detects the operation of the operation lever under a situation in which a speed of the internal combustion engine is less than or equal to a predetermined speed, the valve controller operates the hydraulic control valve unit to discharge the hydraulic oil without supplying the hydraulic oil to the hydraulic mechanism and instructs the internal combustion engine controller to increase the speed of the internal combustion engine, and subsequently operates the hydraulic control valve unit to supply the hydraulic mechanism with the hydraulic oil. | 11-13-2014 |
20140336002 | INDUSTRIAL VEHICLE AND METHOD FOR CONTROLLING INDUSTRIAL VEHICLE - An industrial vehicle that includes an engine, a hydraulic actuator, a hydraulic pump, and an instruction member operated to instruct operation of the hydraulic actuator. A supply passage supplies hydraulic oil to the hydraulic actuator. A return passage returns return the hydraulic oil to an oil tank. A controller compares an engine speed and a predetermined comparison threshold value. When the engine speed is less than the comparison threshold value, the controller opens the return passage. The comparison threshold value includes a first threshold value and a second threshold value that is lower than the first threshold value. In response to the operation of the instruction member, the controller opens the return passage, performs revving control to increase the engine speed, and changes the comparison threshold value from the first threshold value to the second threshold value. | 11-13-2014 |
20150259184 | TRAVELING CONTROL DEVICE FOR INDUSTRIAL VEHICLE - A vehicle control device controls a maximum velocity of a forklift by restricting a maximum speed of an engine. Further, the vehicle control device monitors a vehicle velocity. When the vehicle velocity is equal to or higher than a restriction triggering vehicle velocity obtained by subtracting a predetermined velocity from the maximum velocity, the vehicle control device restricts the maximum speed of the engine. | 09-17-2015 |