摘要:
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.
摘要:
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. The target output torque 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.
摘要:
A method of controlling speed change of a hydraulic drive device for vehicles and a speed change device, which provide a favorable travelling efficiency and a favorable controllability. The method of controlling speed change comprises performing control through discriminating at least between power running and brake running from a magnitude of acceleration (θ) and a rotating speed of a hydraulic motor (50). At the time of power running, a change-over valve (21) may be fully opened in accordance with the rotating speed (ωout) of the hydraulic motor (50) and the magnitude of acceleration (θ). Also, the speed change device comprises a detecting sensor (61a) for the magnitude of acceleration, a motor rotating speed detecting sensor (52) for detecting a vehicle speed (V), and a control device (60) for discriminating between power running and brake running on the basis of the magnitude of acceleration (ωout) and the vehicle speed (V) for controlling.
摘要:
An engine room (35) is divided into a left room and a right room by a cooling unit (18). An intake chamber (36) is disposed at a left side and an engine and the like are disposed at a right side. A cooling heat sink (24) is provided on a side of the intake chamber (36), and a storage (26) and a controller (25) for controlling hybrid electronic devices are formed in this order in a cooling heat sink (24). Further, a cooling pump (27) for supplying cooling liquid to the cooling heat sink (24) is provided in the intake chamber (36). A radiator (31) for cooling the cooling liquid is provided in front of the cooling unit (18).
摘要:
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. The target input torque 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. The target output torque 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.
摘要:
An engine room (35) is divided into a left room and a right room by a cooling unit (18). An intake chamber (36) is disposed at a left side and an engine and the like are disposed at a right side. A cooling heat sink (24) is provided on a side of the intake chamber (36), and a storage (26) and a controller (25) for controlling hybrid electronic devices are formed in this order in a cooling heat sink (24). Further, a cooling pump (27) for supplying cooling liquid to the cooling heat sink (24) is provided in the intake chamber (36). A radiator (31) for cooling the cooling liquid is provided in front of the cooling unit (18).
摘要:
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. The target input torque 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. The target output torque 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.
摘要:
The present invention relates to a speed changing device for a hydraulic driving apparatus and a speed change control method thereof which provide excellent controllability, running efficiency and reliability without occurrence of cavitation. To this end, the device comprises a shifter selected position sensor (63a) for detecting a shift lever change, a motor rotation speed sensor (52) for detecting a rotation speed of a hydraulic motor (50), and a control device (60), and the control device (60) judges and controls either a powering control or a brake control based on the change of the shift lever selection and on the comparison of the detected motor rotation speed with a memorized motor rotation speed. In addition, a two-stage back pressure valve (23) may be provided between a directional control valve (21) and an oil tank.