A multi-speed planetary transmission is operable in at least nine forward speed ratios, at least one reverse speed ratio, and at least one neutral speed ratio. A hydraulic control system for the transmission includes a hydraulic default control system and is operable to a default configuration when a default condition occurs during operation of the transmission. The hydraulic control system defaults to a forward default gear ratio during operation of the transmission in a first forward speed ratio and defaults to a default neutral speed ratio during operation of the transmission in a reverse speed ratio when a default condition occurs. The default condition may be a transmission control module (“TCM”) power failure.

A valve system for a hydraulic emergency driving gear function of a hydraulic control unit for a motor vehicle automatic transmission includes a position valve (104) with a first piston slide (120) and an electromagnetic pressure regulator (86) having a decreasing characteristic curve. The first piston slide (120) is preloaded in a first position. When the first piston slide (120) is in a second position, the electromagnetic pressure regulator (86) is configured for connecting a system pressure-carrying line (18) of the motor vehicle automatic transmission to a first emergency driving gear clutch (12) of the motor vehicle automatic transmission and to a second emergency driving gear clutch (15) of the motor vehicle automatic transmission, whereby the first emergency driving gear clutch (12) and the second emergency driving gear clutch (15) are actuated, so that an emergency driving gear of the motor vehicle automatic transmission is engaged.

A shift range control device switches a shift range by controlling driving of an actuator. A plurality of control units are configured to control the driving of the actuator. A plurality of monitoring control units are correspondingly provided for the plurality of control units, and configured to monitor the corresponding control units. The driving of the actuator is controlled by one of the control units, which is in a normal state. When an abnormality occurs in the one of the control units being used to control the driving of the actuator, the one is switched to another one of the control units to control the driving of the actuator.

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.

A control apparatus of a transmission includes a hydraulic pressure circuit, an abnormality detector, and a controller. The transmission performs shifting operation of the transmission. The controller controls the shifting operation by controlling, as a first control operation, a control pressure adjusting value to allow a line pressure and a control pressure to have a correlation with each other and by using, as a value of the line pressure, a value calculated on a basis of a detected value of the control pressure. The controller controls the shifting operation by controlling, as a second control operation, the control pressure adjusting valve to allow the line pressure and the control pressure to have a correlation with each other and by using, as a value of the control pressure, a value calculated on a basis of a detected value of the line pressure.

A control apparatus of a continuously variable transmission includes a shifting controller and a detector. The continuously variable transmission includes a hydraulic pressure supplier and a continuously variable transmission unit. The continuously variable transmission unit is able to perform continuously variable shifting by a hydraulic pressure in the hydraulic pressure supplier. The shifting controller causes, when the detector detects an abnormality, the hydraulic pressure in the hydraulic pressure supplier to fall within a range that is equal to or greater than a first value and less than a second value. The first value is a value at which minimal operation performed by the continuously variable transmission unit is available. The second value is a value upon normal operation before the detector detects the abnormality.

A method for operating a motor vehicle with a prime mover (1), a transmission (2), a driven end (14), and a parking lock system (19) is provided. A shift element (9) of the transmission (2) and a parking lock actuator (21) of the parking lock system (19) utilize a common pressure control. When the shift element (9) is actuated with the aid of a pressure control effecting an at least partial engagement of the shift element (9) and when the pressure control is less than a limiting value for holding the parking lock system (19) in the disengaged position, the method includes monitoring a parking lock sensor (23) to determine whether the parking lock sensor (23) detects a movement of the parking lock actuator (21) or a signal corresponding to the movement of the parking lock actuator (21) despite a parking lock detent (22) having been actuated for locking.

A hydraulic system for a vehicle transmission with at least two friction elements, the system comprising a first hydraulic circuit comprising a pump for supplying hydraulic fluid to the first hydraulic circuit. A flow restriction may be provided in the first hydraulic circuit between an output of the pump and a sump for providing leakage of hydraulic fluid into the sump. Further, a second hydraulic circuit comprising a second pump may be arranged, wherein the hydraulic pressure in the first circuit is higher compared to the second circuit. A flow control element operated using hydraulic pressure from the first circuit may be arranged for controlling flow/pressure in the second circuit. Further, the hydraulic system may be arranged for generating a line pressure, wherein an actuator for engaging a park lock system may be connected to the first hydraulic circuit for enabling direct actuation by means of the line pressure.

A control apparatus for a vehicle drive-force transmitting apparatus including a gear mechanism and a continuously-variable transmission mechanism and defining first and second drive-force transmitting paths. When the continuously-variable transmission mechanism is in a failure state in which an actual gear ratio of the continuously-variable transmission mechanism is not the highest gear ratio as a target gear ratio, the control apparatus sets the target gear ratio to a transient target gear ratio that is gradually changed toward the highest gear ratio, for causing the actual gear ratio to be gradually changed toward the highest gear ratio. A rate of change of the transient target gear ratio is higher in a state in which a drive force is transmitted through the first drive-force transmitting path by the gear mechanism, than in a state in which the drive force is transmitted through the second drive-force transmitting path by the continuously-variable transmission mechanism.

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.