A control apparatus for a vehicle makes the vehicle travel without depending on operation of a shift operation apparatus by a driver, even in a case where a detection abnormality by which a shift operation position of the shift operation apparatus becomes indefinite has occurred.

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 back-up control unit of a back-up power source device executes: a battery failure determination process of determining whether or not a battery failure has been detected by a failure detecting unit; when it is determined that battery failure has been detected in the battery failure determination process, a switching instruction determination process for determining, on the basis of an instruction signal from a monitor circuit, whether or not an instruction to switch to a P range has been made by a user; and when it is determined that a switching instruction has been made in the switching instruction determination process, a shifting instruction process for starting power supply from a back-up power source to a shift control unit and instructing the shift control unit to shift to the P range.

A method of controlling a multispeed transmission includes providing a transmission controller, a plurality of ranges of the transmission of which at least one of the plurality of ranges is defined as a limiting range, and a communication link. The transmission is operated in a first range of the plurality of ranges and the method includes detecting a loss of communication over the communication link between the transmission controller and another controller. The method also includes determining if the first range is defined as the limiting range when communication is lost and commanding a shift from the first range to a second range of the plurality of ranges which is not defined as the limiting range. The method further includes controlling the shift from the first range to the second range.

A transmission control apparatus for controlling a vehicle's transmission. The apparatus includes (i) a control motor mechanically connected to the transmission's selector drum and is actuable to rotate the selector drum, (ii) a torque sensor which senses torque applied to the selector drum by the control motor, (iii) a controller configured to control the control motor based on signals received from the torque sensor to control the engagement/disengagement of the dog clutches; and (iv) a cam indexer connected to the selector drum. The cam indexer includes (i) a cam sprocket having one gear detent corresponding to each of gear engagement position of the selector drum, and one neutral detent corresponding to each neutral position of the selector drum, and (ii) a cam follower that engages with the gear detents and biases the selector drum into either a corresponding gear engagement position or a corresponding neutral position.

A shift-by-wire type control device whose control target is an automatic transmission including a parking lock mechanism, the shift-by-wire type control device includes an electronic control unit that controls the automatic transmission in response to an instruction to select a shift range when selection of the shift range based on an operation on a to-be-operated part is performed.

A method of controlling a multispeed transmission includes providing a transmission controller, a plurality of ranges of the transmission of which at least one of the plurality of ranges is defined as a limiting range, and a communication link. The transmission is operated in a first range of the plurality of ranges and the method includes detecting a loss of communication over the communication link between the transmission controller and another controller. The method also includes determining if the first range is defined as the limiting range when communication is lost and commanding a shift from the first range to a second range of the plurality of ranges which is not defined as the limiting range. The method further includes controlling the shift from the first range to the second range.

A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method including: comparing a temperature of the electric oil pump with a first threshold; and restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.

A method for operating a drive train having a power generator, a mechanical power transmission device, and a power receiver wherein the power transmission device is monitored to detect mechanical damage and/or the development of mechanical damage to the power transmission device, wherein detected damage and/or detected damage development is localized and the power generator, the power transmission device, and/or the power receiver are/is controlled such that a mechanical load at the localized damage location and/or damage development location is selectively reduced. A program product including program code sections with which such a method is feasible when the program product is executed on a programmable controller, a computer, or other programmable device.

The present invention is a control device for an automatic transmission, the control device being adapted to control the automatic transmission including a torque converter and a stepped transmission mechanism provided on a power transmission route from the torque converter to drive wheels, wherein while a non-driving range of the automatic transmission is selected, determination on interlock in the stepped transmission mechanism is executed on the basis of deceleration of an output shaft of the stepped transmission mechanism and a change in the torque converter.