A vehicle control system and a method for a vehicle running on a low friction road inhibit repetitive gear shifts of a transmission of the vehicle. The vehicle control system of the vehicle includes: one or more sensors for sensing an engine speed of the vehicle, an engine oil temperature, a position of an accelerator pedal, a lateral acceleration of the vehicle, a rotational angle of a steering wheel, or whether a low friction road running mode switch is turned on or off; and a controller for receiving sensor data from the sensors. In particular, the controller determines whether the vehicle satisfies an entry condition for performing a repetitive shift prevention control based on the sensor data, and controls a gear shift of the transmission and an engine torque to inhibit the repetitive gear shifts of the vehicle when the downshift occurs when the vehicle has satisfied the entry condition.

This vehicle control device 10 is provided with: a current gear stage selection unit 13 which selects a current gear stage, which is the gear stage of the vehicle in the present travel state; a travel segment determination unit 15 which determines the next travel segment forwards in the direction of travel of the vehicle V; and a shift control unit 17 which, in the case that the current gear stage selection unit 13 has newly selected a target gear stage lower than the current gear stage during travel of the vehicle V in the current gear stage in the current travel segment, if the next travel segment can be traveled in the current gear stage and the amount the vehicle V will lose speed after traveling the current travel segment is less than or equal to a prescribed threshold value, controls shifting of the gear stage such that downshifting from the current gear stage to the target gear stage is suppressed and the current gear stage is maintained. Even in a state in which downshifting is suppressed, if the state of the vehicle the satisfies a prescribed condition, then the shift control unit 17 controls shifting of the gear stage so as to downshift to the target gear stage without suppression of downshifting.

A transmission mode control system includes a control device that controls a transmission mode of a vehicle and a first input device that accepts a switching operation of switching from an automatic transmission mode to a manual transmission mode. The control device includes a processor and a memory. The processor executes a process including: switching the transmission mode from the manual transmission mode to the automatic transmission mode when a switching time elapses after an operation of the first input device by a driver of the vehicle; and extending the switching time by a set time when the driver performs, within a post-switching determination time after the switching time elapses, a certain operation that causes a gear ratio to change in the same direction as a change of gear ratio when the gear shift is executed in response to the operation by the driver before the switching time elapses.

A transmission which includes input and output shafts and first and second step-down devices for producing various step-down ratios. The first and second step-down devices are associated with first and second controllable clutches, respectively, in order to connect, in a torque-transmitting manner, the respective step-down device between the input shaft and the output shaft. A first gear of the transmission is obtained by actuating the first clutch and a second gear by actuating the second clutch. A method of controlling a gearshift, from the first gear to the second gear, includes the steps of determining operating condition parameters of the transmission; and determining optimized degrees of actuation of the clutches by a search process related to a transmission model that determines the degrees of actuation on the basis of operating condition parameters in relation to a predetermined optimization criterion. The transmission model is based on slip.

A method for operating a motor vehicle having a transmission (1), the method including closing a first number of shift elements and opening a second number of shift elements in each selected, force locking gear ratio of the transmission (1); closing one shift element less, and therefore opening one shift element more than in a selected, force locking gear ratio when a transmission (1) is not force locking in the sailing mode; adjusting the respectively closed and opened shift elements as a function of at least one operating condition of the motor vehicle in the sailing mode; and checking, at least on the basis of the rotational speed of the transmission input shaft (2), whether a previously closed, positively locking shift element (A, F) to be opened is actually opened in the sailing mode during adjusting of the respectively closed and opened shift elements.

A method for a more efficient use of a vehicle combustion engine during driving, the vehicle including an automatic step geared transmission. The method includes the steps of sensing current engine rotational speed and engine rotational speed increase, estimating necessary minimum upshift engine rotational speed for a coming gear upshift, registering that the engine rotational speed stops increasing without reaching the minimum upshift engine rotational speed, and where the engine rotational speed stops increasing relatively close to a maximum engine rotational speed where engine efficiency is relatively low and, automatically controlling engine output torque in order to limit the engine rotational speed to a first predetermined engine speed where engine efficiency is relatively high.

A vehicle control apparatus including a surrounding circumstances detector detecting surrounding circumstances of a self-driving vehicle and a microprocessor generating an action plan including a target path of the self-driving vehicle based on the surrounding circumstances detected and controlling a driving component so that the self-driving vehicle travels by self-driving in accordance with the action plan. The microprocessor is configured to perform calculating a hindrance time a first action plan is hindered when a second action plan is generated, determining whether the hindrance time is shorter than a predetermined time period, and controlling the driving component to keep a first state according to the first action plan when the hindrance time is shorter than the predetermined time period, while to change to a second state according to the second action plan when the hindrance time is longer than or equal to the predetermined time period.

A control system for a vehicle includes one or more controllers, wherein the control system is configured to: receive a driver gear shift request; determine if the vehicle is in a vehicle initialisation period; determine if a driver of the vehicle is actuating at least one brake of the vehicle; store the driver gear shift request in dependence-based at least in part on the determination that the vehicle is in the vehicle initialisation period and the driver is actuating at least one brake of the vehicle; determine if the vehicle initialisation period has ended; and control execution of the stored driver gear shift request when the vehicle initialisation period has ended.

A method for operating a drive train of a motor vehicle, where the drive train includes a drive aggregate, a group transmission connected between the drive aggregate and a drive output, and a separating cutch connected between the drive aggregate and the group transmission. If a speed is lower than a limit value, the separating clutch is opened and for transmission preselection one or all the other sub-transmission(s) is/are changed to a friction-force-locking condition. The separating clutch is then at least partially closed and the drive aggregate is brought to a defined rotation speed. When a friction-force-locking group transmission is required, it is checked whether a starting gearshift or a driver-desired shift for the group transmission is called for and the target rotation speed of the drive aggregate is checked. Depending on the results, the sub-transmission can be synchronized by a transmission brake or by the drive aggregate.

A multi-speed automatic transmission having a control circuit for managing a hill climb event is provided. The control circuit may detect the hill climb event, such as by identifying when an upshift from a climb gear to an upshift gear would cause deceleration on a hill. The control circuit may also respond to the hill climb event based on desired performance characteristics, including fuel economy, speed, acceleration, and other performance characteristics. In one embodiment, the control circuit responds to the hill climb event by cycling the multi-speed automatic transmission between the climb gear and the upshift gear.