Abstract: The target input shaft torque determination unit determines a target input shaft torque. The target output shaft torque determination unit determines a target output shaft torque so that a deceleration force for decelerating the vehicle is generated on the output shaft of the power transmission device in a state in which connection and disconnection states of the forward travel clutch and the reverse travel clutch are maintained at the state before the start of the shuttle action when the shuttle action is started. The torque-balance information is stored in a storage unit and defines a relationship between the target input shaft torque and the target output shaft torque to achieve a balance of the torques of a power transmission device. The command torque determination unit uses the torque-balance information to determine torque commands for the motor from the target input shaft torque and the target output shaft torque.

Abstract: A controller includes a neutral control determination unit, a forward-reverse clutch control unit, and a commanded torque setting unit. The neutral control determination unit executes quasi-neutral control when a quasi-neutral control determination condition is satisfied. The quasi-neutral control determination condition includes cases where the forward-reverse operation member is in the neutral position. The forward-reverse clutch control unit keeps the forward-travel clutch or the reverse-travel clutch engaged during the quasi-neutral control. During quasi-neutral control, the commanded torque setting unit determines a commanded torque sent to the motor so that a neutral state is set where the output torque from the power transmission device to the travel device is kept at a prescribed value regardless of the drive power output from the engine.

Abstract: A work vehicle is equipped with an engine, a hydraulic pump, a work implement, a travel device, an accelerator operating member, a work implement operating member, and a control unit. The hydraulic pump is driven by the engine. The work implement is driven by hydraulic fluid discharged from the hydraulic pump. The travel device is driven by the engine. The accelerator operating member changes the engine rotation speed. The work implement operating member operates the work implement. The control unit causes the speed of the work implement to increase by causing the engine rotation speed to increase when an operation amount of the work implement operating member is increased.

Abstract: A work implement requirement determination unit of a work vehicle determines a work implement required power based on the operation amount of a work implement operating member and the work implement pump pressure. A transmission requirement determination unit determines a transmission required power based on the vehicle speed and the operation amount of the accelerator operating member. When the sum of the work implement required power and the transmission required power is greater than a first distributable power that a predetermined preferential distribution power subtracted from a load upper limit power of the engine leaves, a distribution ratio determination unit allocates the smaller of a transmission compensation power and the transmission required power to a power transmission device and distributes the remainder of the first distributable power to the work implement pump and to a power transmission device.

Abstract: A power transmission includes first and second clutches for switching a transmission path for a driving force therein. A clutch controlling unit provided for a work vehicle is configured to switch the transmission path from one to the other of first and second modes when a speed ratio parameter reaches a mode switching threshold. The clutch controlling unit is configured to keep setting the transmission path in the other mode even when the speed ratio parameter again reaches the mode switching threshold until a switching prohibition period having a predetermined initial value expires as long as a period of time elapsed after mode switching is included in the switching prohibition period. A trigger detecting unit provided for the work vehicle is configured to make the switching prohibition period expire when detecting a predetermined operation in the switching prohibition period.

Abstract: A target-input-torque determination unit determines the target input torque on the basis of the transmission required horsepower. The target input torque is a target value for the torque to be inputted to a power-transmission device. A target-output-torque determination unit determines the target output torque, which is a target value for the torque to be outputted by the power-transmission device. A command-torque determination unit uses torque-balance information to determine command torque for the motor from the target input torque and the target output torque. The target-input-torque determination unit determines the upper limit of the target input torque on the basis of an upper-limit-target-input-torque line and the engine rotation speed. The upper-limit-target-input-torque line sets a value smaller than the target output torque of the engine determined using the engine required horsepower and the engine rotation speed for the upper-limit value of the target input torque.

Abstract: When a clutch is in the disengaged state, the predicted engagement time determining unit determines a predicted engagement time. The predicted engagement time is the predicted value for the time required from the beginning of the clutch engagement until engagement is complete. The speed ratio parameter estimating unit determines an estimated value for a speed ratio parameter after the elapse of the predicted engagement time from the current point in time. When the estimated value for the speed ratio parameter reaches a mode-switching threshold value, a clutch control unit outputs a clutch command signal for causing the clutch to engage.

Abstract: A control unit has a connection determining unit and a motor switch control unit. The connection determining unit determines whether assistance from a third motor is required or not. The third motor is set to a connected state when the connection determining unit determines that assistance from the third motor is required. The motor switch control unit controls the motor switching mechanism so that the third motor is set to a disconnected state when the connection determining unit determines that assistance from the third motor is not required.

Abstract: A work vehicle includes a control unit having a motor switch control unit and a motor command determining unit. The motor switch control unit controls a motor switching mechanism so that a third motor connects to a first motor when a first rotation speed is less than a second rotation speed. The first rotation speed is the rotation speed of the first motor corresponding to that of a rotating shaft of the third motor. The second rotation speed is the rotation speed of the second motor corresponding to that of a rotating shaft of the third motor. When the third motor is connected to the first motor, the motor command determining unit determines a command torque for the first motor and the third motor so that the command torque for the third motor is no more than the command torque for the first motor.

Abstract: A work vehicle includes a pump brake control determining unit determines that a pump brake control is to be executed for causing a braking force to be generated by using a load on a hydraulic pump during braking. A pump brake torque control unit increases a pump brake torque to correspond to the load on the hydraulic pump during the pump brake control.

Abstract: A required traction force determining part is configured to determine a required traction force corresponding to an output rotational speed based on a required traction force characteristic. A command torque determining part is configured to determine a command torque to be transmitted to a motor to obtain the required traction force. An opposite movement determining part is configured to determine that a vehicle is oppositely moving when a vehicle speed becomes a predetermined speed threshold or greater in a direction opposite to a moving direction corresponding to a position of a forward/rearward movement operating member. A traction force assisting part is configured to perform a traction force assisting control when it is determined that the vehicle is oppositely moving. The traction force assisting part is configured to increase the required traction force in the moving direction corresponding to the position of the forward/rearward movement operating member.

Abstract: A control unit of a work vehicle has a transmission requirement determination unit, a command-torque determination unit, and a tractive force limiting unit. The transmission requirement determination unit determines a required tractive force on the basis of an operating amount of an accelerator operating member. The required tractive force is a target tractive force of a travel device. The command-torque determination unit determines an output torque of the electric motor so that the tractive force of the vehicle reaches the required tractive force. The tractive force limiting unit reduces the required tractive force to a value less than a value corresponding to the operating amount of the accelerator operating member when the vehicle is excavating.

Abstract: A target-input-torque determination unit determines the target input torque on the basis of the transmission required horsepower. The target input torque is a target value for the torque to be inputted to a power-transmission device. A target-output-torque determination unit determines the target output torque, which is a target value for the torque to be outputted by the power-transmission device. A command-torque determination unit uses torque-balance information to determine command torque for the motor from the target input torque and the target output torque. The target-input-torque determination unit determines the upper limit of the target input torque on the basis of an upper-limit-target-input-torque line and the engine rotation speed. The upper-limit-target-input-torque line sets a value smaller than the target output torque of the engine determined using the engine required horsepower and the engine rotation speed for the upper-limit value of the target input torque.

Abstract: The target input shaft torque determination unit determines a target input shaft torque. The target output shaft torque determination unit determines a target output shaft torque so that a deceleration force for decelerating the vehicle is generated on the output shaft of the power transmission device in a state in which connection and disconnection states of the forward travel clutch and the reverse travel clutch are maintained at the state before the start of the shuttle action when the shuttle action is started. The torque-balance information is stored in a storage unit and defines a relationship between the target input shaft torque and the target output shaft torque to achieve a balance of the torques of a power transmission device. The command torque determination unit uses the torque-balance information to determine torque commands for the motor from the target input shaft torque and the target output shaft torque.

Abstract: The work implement requirement determination unit determines a work implement required horsepower on the basis of an operation amount of a work implement operating member and a hydraulic pressure of a hydraulic pump. A transmission requirement determination unit determines a transmission required horsepower on the basis of a vehicle speed and the operation amount of the accelerator operating member. An engine requirement determination unit determines an engine required horsepower on the basis of the work implement required horsepower and the transmission required horsepower. The required throttle determination unit determines a required throttle value based on an engine requirement.

Abstract: The power-transmission device has an input shaft, an output shaft, a gear mechanism, and a motor. The gear mechanism includes a plurality of planetary gear mechanisms and a mode-switching mechanism, and transmits the rotations of the input shaft to the output shaft. The mode-switching mechanism selectively switches the drive-power transmission path of the power-transmission device between a plurality of modes. The motor is connected to the rotating elements of the planetary gear mechanisms. A target-input-torque determination unit determines the target input torque, which is a target value for the torque to be inputted to the power-transmission device. The target-output-torque determination unit determines the target output torque, which is a target value for the torque to be outputted from the power-transmission device. The command-torque determination unit uses the torque balance information to determine torque commands to the motor from the target input torque and the target output torque.

Abstract: A temperature control system which performs control of an object whose temperature is to be controlled as accurately as possible. The system comprises: a chiller located in a fluid circulating and supplying system, for cooling a thermal fluid returning from a vacuum chamber, a first flow control valve located in the fluid circulating and supplying system in a position between the chiller and the vacuum chamber, a bypass passage for splitting and supplying thermal fluid returning from the vacuum chamber to a position between the first flow control valve and the vacuum chamber, before it reaches the chiller, a second flow control valve located in the bypass passage, and a halogen lamp heater located in the fluid circulating and supplying system in a position between a confluence point of the bypass passage and the vacuum chamber, for adjusting the temperature of the thermal fluid passing therethrough to a set temperature.

Abstract: As a basic connection information determined on the basis of a basic information determined in advance between logic elements by paying attention to the flow of data, the present invention includes a structure for transferring data from one data element to another data element, a structure for transferring data from one data element to a plurality of data elements and a structure for transferring data from a plurality of data elements to one data element, decides the sequence of unidimensional placement of sets of elements as the object of the flow of data inside a logic circuit on the basis of these structures, and automatically and quickly determine the initial placement positions of the sets of elements from the sequence thus decided.

Abstract: A method of logic simulation for simulating operation of a logic circuit by using basic signal values corresponding to states of output signals of elements of the logic circuit to be simulated and expanded signal values including the basic signal values. The logic circuit to be simulated is divided into a portion to be simulated by using the basic signal values and the expanded signal values and a portion to be simulated by using the basic signal values without using the expanded signal values. The elements for which definition of calculation method for output signal values for the input signal values including the expanded signal values is not easy are included in the latter portion, and other elements are included in the former portion.

Abstract: A computer implemented logic simulation method, for inspecting logical operations of large scale logic circuits, computes a variation of an output of at least one latch in a clock synchronized logic circuit. The clock-synchronized logic circuit contains a combination logic circuit and a plurality of logic gates. Each of the logic gates have at least one input signal and several other inputs connected to clocking signal sources of different phases. The latch is activated by the rise or fall of the clock signals for holding the output from the combination logic circuit. The method thus implements sampling instants of the output for ascertaining the logical operations of the large scale circuits.