A shift device includes a knob that is rotatable to select one of a plurality of gear modes of a transmission of a vehicle and a cam member that engages a portion of the knob in a rotation direction of the knob. The cam member rotates integrally with the knob only when engaged with the portion of the knob. The shift device further includes a drive source that rotates the cam member and a controller. The controller controls the drive source to rotate the knob to an operation position corresponding to a predetermined gear mode if a particular condition is satisfied. The controller decreases a voltage applied to the drive source when the cam member is rotated in at least a pre-engagement section until the cam member engages the portion of the knob from the voltage applied when the cam member is rotated in other sections.

A speed changing device includes a control unit (60) that: has a manual mode in which a clutch is engaged and disengaged by operating a clutch lever (4b) and an automatic mode in which the clutch is engaged and disengaged without the clutch lever (4b) being operated and is able to change a setting to the manual mode and the automatic mode; and is configured to signal mode misrecognition when it is determined that mode misrecognition has occurred.

Gear position estimation techniques for a manual transmission of a vehicle include estimating a gear ratio of the manual transmission based on measured speeds of the vehicle and its torque generating system and when the estimated gear ratio is not within a threshold amount from any known gear ratios of the manual transmission, detecting at least two gear shifts of the manual transmission and determining a set of possible axle/tire ratios each indicative of a ratio of an axle ratio of the vehicle to a tire circumference of the vehicle after each gear shift, wherein each set includes values based on the measured torque generating system and vehicle speeds and each of the known gear ratios of the manual transmission, selecting and utilizing one of the possible axle/tire ratios that is common across all of the sets of possible axle/tire ratios.

Gear position estimation techniques for a manual transmission of a vehicle include estimating a gear ratio of the manual transmission based on measured speeds of the vehicle and its torque generating system and when the estimated gear ratio is not within a threshold amount from any known gear ratios of the manual transmission, detecting at least two gear shifts of the manual transmission and determining a set of possible axle/tire ratios each indicative of a ratio of an axle ratio of the vehicle to a tire circumference of the vehicle after each gear shift, wherein each set includes values based on the measured torque generating system and vehicle speeds and each of the known gear ratios of the manual transmission, selecting and utilizing one of the possible axle/tire ratios that is common across all of the sets of possible axle/tire ratios.

A controller includes: an automatic shifting control section that carries out automatic shifting control in which a shifting actuator is driven in response to a predetermined automatic shifting command; and an assist control section that, when a predetermined assist condition is met, carries out assist control in which the shifting actuator is driven to assist motion of a manual shifting power transmission mechanism actuated upon operation of a shifting operation member by a driver.

Gear position estimation techniques for a manual transmission of a vehicle include estimating a gear ratio of the manual transmission based on measured speeds of the vehicle and its torque generating system and when the estimated gear ratio is not within a threshold amount from any known gear ratios of the manual transmission, detecting at least two gear shifts of the manual transmission and determining a set of possible axle/tire ratios each indicative of a ratio of an axle ratio of the vehicle to a tire circumference of the vehicle after each gear shift, wherein each set includes values based on the measured torque generating system and vehicle speeds and each of the known gear ratios of the manual transmission, selecting and utilizing one of the possible axle/tire ratios that is common across all of the sets of possible axle/tire ratios.

Gear position estimation techniques for a manual transmission of a vehicle include estimating a gear ratio of the manual transmission based on measured speeds of the vehicle and its torque generating system and when the estimated gear ratio is not within a threshold amount from any known gear ratios of the manual transmission, detecting at least two gear shifts of the manual transmission and determining a set of possible axle/tire ratios each indicative of a ratio of an axle ratio of the vehicle to a tire circumference of the vehicle after each gear shift, wherein each set includes values based on the measured torque generating system and vehicle speeds and each of the known gear ratios of the manual transmission, selecting and utilizing one of the possible axle/tire ratios that is common across all of the sets of possible axle/tire ratios.

A method of operating a powertrain system during coasting operation, wherein the powertrain system includes a driveline component (e.g., a transmission, drive shaft, differential, axle or wheel) having an output torque profile. The method includes: (i) determining a desired output torque transition profile for the driveline component between a first transition point before an end of a first state, and a second transition point after a beginning of a second state; and (ii) in response to a braking torque request, generating a friction braking torque command to operate a friction braking system, and adjusting the friction braking torque command during a transitional state between the first and second transition points by an amount corresponding to a difference between a magnitude of the output torque profile and a magnitude of the desired output torque transition profile.

A method of operating a powertrain system during coasting operation, wherein the powertrain system includes a driveline component (e.g., a transmission, drive shaft, differential, axle or wheel) having an output torque profile. The method includes: (i) determining a desired output torque transition profile for the driveline component between a first transition point before an end of a first state, and a second transition point after a beginning of a second state; and (ii) in response to a braking torque request, generating a friction braking torque command to operate a friction braking system, and adjusting the friction braking torque command during a transitional state between the first and second transition points by an amount corresponding to a difference between a magnitude of the output torque profile and a magnitude of the desired output torque transition profile.

A shift range control device includes: multiple controllers that communicate with each other and control driving of a motor. The multiple controllers share control information, and include a first controller and a second controller. When the control information of the first controller is different from the control information of the second controller, one of the first controller and the second controller is set as a continuation controller, and a different one of the first controller and the second controller is set as a stop controller. The stop controller stops the drive control. The continuation controller performs the drive control of the motor.