A vehicle travel control method and a vehicle travel control device carries out a downshift control of an automatic transmission when a vehicle speed increases from a set vehicle speed during a constant speed travel control by at least a first prescribed value. Subsequent downshift control of the automatic transmission is prohibited upon determining the vehicle speed has increased from the set vehicle speed by at least the first prescribed value due to an operation of an operating element by the driver during constant speed travel control. Downshift control of the automatic transmission is executed upon determining insufficient deceleration of the vehicle exists where the driver is not operating the accelerator pedal during prohibition of the downshift control.

The present invention provides a transmission control device for a vehicle capable of changing a threshold of a shift map for determining shift-up, thereby preventing occurrence of the shift-up during depression of an accelerator and preventing occurrence of a torque interruption. In a transmission control device for a vehicle 1 including a T/M-ECU 50 which automatically performs shift control for switching a plurality of shift gears of a transmission 20 for shift-up or shift-down, the T/M-ECU 50 has a shift threshold setting unit 54 which sets a shift threshold to be used for the shift control, on the basis of an operation plan or a surrounding state of the vehicle 1, and the shift threshold setting unit 54 sets the shift threshold to perform the shift control on the transmission 20 so as not to perform the shift-up of the transmission 20 during acceleration of the vehicle 1.

An ECU determines whether or not a road surface changes from a low μ road surface to a high μ road surface based on image data obtained by a camera sense. When the ECU determines that the accelerator pedal operation amount deceases greatly in a predetermined determination period from a time point at which a drive wheel slip state occurs in a case where the ECU determines that the road surface changes from the low μ road surface to the high μ road surface, it prohibits upshift operation of an automatic transmission over a predetermined period from that time point.

A human-powered vehicle control device controls the transmission that changes the transmission ratio of a human-powered vehicle. The control device includes an electronic controller that switches between a first control state for controlling the transmission to change the transmission ratio in accordance with a first prescribed set of conditions, and a second control state for controlling the transmission to suppress the change of the transmission ratio as compared with if the electronic controller is in the first control state, in accordance with at least one of the motion state of the body of the human-powered vehicle, the steering state of the human-powered vehicle, the surface conditions of a travel path on which the human-powered vehicle travels, and a pedaling preparation state related to the pedals of the human-powered vehicle.

The invention relates to an operating method for an automatic transmission, particularly for an automatic variable-speed transmission and/or dual-clutch transmission, for a motor vehicle. The automatic transmission can be operated in a cost-effective manner, particularly with reduced component wear and increased service life, and/or the driving comfort of the vehicle can be improved such that when lifting of at least one driven vehicle wheel off the roadway during braking is detected by the operating method, then for the length of said braking process, in the event of an incomplete gear change into a gear of the transmission, the engagement of a gear is prevented and/or the beginning of a gear change into a gear of the transmission is prevented.

This vehicle control device 10 is provided with: a current gear stage selection unit 13 which, on the basis of the travel resistance of the vehicle, selects a current gear stage, which is the gear stage of the vehicle in the current travel segment where the vehicle is traveling; a next gear stage selection unit 16 which selects a next gear stage, which will be the gear stage of the vehicle in the next travel segment, forwards in the travel direction of the vehicle, having a road slope different from that of the current travel segment; and a shift control unit 17 which, if during travel of the vehicle in the current travel segment in the current gear stage, the current gear stage selection unit 13 has newly selected a target gear stage higher than the next gear stage, controls shifting such that upshifting from the current gear stage to the target gear stage is suppressed and the current gear stage is maintained. If, in a state in which upshifting is suppressed, the engine rotation speed reaches or exceeds a prescribed value during travel in the current travel segment, the shift control unit 17 controls shifting so as to upshift to the target gear stage without suppression of upshifting.

The disclosure provides a vehicle and a method for controlling the vehicle. The vehicle includes: an engine; a transmission configured to transmit power from the engine to drive wheels; a deceleration factor detection device configured to detect a deceleration factor that is present ahead of the vehicle; and an electronic control unit configured to maintain a speed ratio of the transmission as a current speed ratio on condition that the deceleration factor is detected by the deceleration factor detection device, and change the speed ratio stepwise to a lower speed side than the current speed ratio and maintain the changed speed ratio, in response to a deceleration request from a driver.

A method of controlling an automated manual transmission system having a transmission and a shifter is provided. The shifter includes a Drive Mode, a Low Mode and at least one of a Manual Mode and a Hold Mold. The Drive Mode automatically selects a default gear of the transmission and automatically performs all upshifts and downshifts. The Manual Mode permits an operator to manually select an upshift and a downshift of the transmission. The Hold Mode permits an operator to maintain a current operating gear. Control determines whether the shifter is in one of the Manual Mode and the Hold Mode. Control determines whether a vehicle operating condition is outside of a predetermined threshold. Control operates the transmission in Drive Mode based on the vehicle operating condition being outside of the predetermined threshold irrespective of the shifter being in one of the Low Mode, Manual Mode or Hold Modes.

An apparatus and method for controlling a transmission of a vehicle, may include a determination device that determines whether a curve is present within a predetermined distance ahead of the vehicle, based on information regarding a road ahead of the vehicle, a calculation device that determines lateral acceleration of the vehicle based on information regarding the curve and information regarding a state of the vehicle and determines a pattern correction coefficient based on the predicted lateral acceleration, a pattern correction device that corrects a preset gear-shift pattern based on the pattern correction coefficient, and a controller that is configured to control the transmission based on the corrected gear-shift pattern when the vehicle enters the curve.

A control apparatus for a drive-force transmitting apparatus that defines a first drive-force transmitting path that is to be established by engagements of a first frictional engagement device and a dog clutch and a second drive-force transmitting path in which a lower gear ratio is provided than in the first drive-force transmitting path. In a second running mode with the second drive-force transmitting path being established, the control apparatus places the dog clutch in a released state when a vehicle running speed is higher than a first speed value, and places the dog clutch in an engaged state when the running speed is not higher than the first speed value. Further, in the second running mode, the control apparatus inhibits the dog clutch from being switched to the released state when an accumulated heat quantity in a synchromesh mechanism of the dog clutch is larger than a first quantity value.