Abstract: There is provided an electric power steering apparatus having an electric motor 12 for generating a steering assist torque to a steering mechanism and a motor control part 24 for controlling the electric motor 12 by a pulse-width modulating signal in accordance with a current command value corresponding to a steering torque. The motor control part 24 has a motor torque detection part 67 detecting a motor torque, a motor torque change rate detection part 68 calculating a motor torque change rate, and a duty ratio limiting part 64 fixing a duty ratio of the pulse-width modulating signal to a predetermined value for limiting a torque transmitted to a torque transmitting member disposed between a steering shaft of a steering mechanism and a steering road wheel when a calculated torque change rate is not less than a threshold value for judging a steering limit position.

Abstract: In an automatic transmission in which an input shaft torque of the automatic transmission is estimated from an engine torque and an oil pressure during a period of gear change is controlled corresponding to the input shaft torque, the estimation value of the input shaft torque is held to a value immediately before a gear change judgment until a period of time from the gear change judgment until a changing speed of an engine rotation speed exceeds a predetermined value, and when the changing speed exceeds the predetermined value, an estimation value of the engine torque is processed by a low pass filter having a time constant corresponding to the engine rotation speed, thereby the estimation value of the input shaft torque based on the estimation value of the engine torque passing through the low pass filter.

Abstract: A gearshift controller for an automatic transmission comprises an input shaft torque estimating portion for estimating the input shaft torque, a torque dividing ratio setting portion for setting the torque dividing ratio for each friction member of each gear range, and a desired torque calculating portion for calculating the desired torque of each friction member on the basis of the input shaft torque and the torque dividing ratio, and a desired hydraulic fluid calculating portion for calculating the desired hydraulic fluid pressure for each friction member on the basis of the desired torque of the each friction member, and a hydraulic fluid controlling portion for providing the desired hydraulic fluid pressure to each friction member.