A compression-based speed limiting for a driveline including a transmission is described herein. The driveline controller detects over speeding and controls the ratio of the transmission to therefore increase compression of the prime mover and therefore limit speed.

A method of controlling uphill driving of a hybrid vehicle provided with a dual clutch transmission (DCT) may include determining, by a controller, a driving state of a vehicle on the basis of information collected from the vehicle; when the vehicle is determined as being in a uphill driving state, performing, by the controller, high torque control on an engine of the vehicle by increasing an engine torque to control the engine at a predetermined high torque engine operating point and reducing a motor torque of a motor in the vehicle to satisfy a driver request torque; and during the performing of the high torque control on the engine, comparing, by the controller, a state of charge (SOC) value of a battery with a set first SOC threshold value, and when the SOC value of the battery is less than or equal to the first SOC threshold value, performing engine and motor speed control to defend the SOC value of the battery.

A transmission includes an input shaft and an output shaft, the input shaft selectively accepting a torque input from a prime mover, and the output shaft selectively providing torque output to a driveline. A controller determines a shaft displacement angle representing an angle value of rotational displacement difference between at least two shafts of the transmission, and performs a transmission operation responsive to the shaft displacement angle.

A system and method for controlling driving of an electronic 4-wheel drive hybrid vehicle appropriately executes torque distribution and compensation to front wheels and rear wheels in each gear position to satisfy driver's requested torque depending on selected driving mode of the electronic 4-wheel drive hybrid vehicle in which an engine and a front wheel motor are connected to the front wheels and a rear wheel motor is connected to the rear wheels, thereby being capable of increasing acceleration performance when a sports mode is selected as the driving mode and realizing acceleration linearity when a comfort mode is selected as the driving mode.

A vehicle control apparatus includes an overlapping-prediction determination portion configured to determine whether or not it is predicted that, during execution of a synchronous control for placing a clutch, which is provided between an engine and an electric motor, into an engaged state, a synchronization-completion time point of the clutch overlaps with an inertia phase period in process of a shift control of a transmission, and a torque limitation portion configured, when the overlapping-prediction determination portion determines that it is predicted that the synchronization-completion time point overlaps with the inertia phase period, to execute a torque limitation by which at least one of a torque capacity of the clutch and an output torque of the engine is made smaller than when the overlapping-prediction determination portion determines that it is not predicted that the synchronization-completion time point overlaps with the inertia phase period.

A method and system for controlling clutch friction elements of an automatic transmission is provided. The method includes retrieving information about shift clutches from a data storage unit and acquiring information required to predict a temperature of a friction element for each shift clutch, deriving a predicted temperature value of a friction element for each shift clutch by using the information about the shift clutches and the information required to predict the temperature of the friction element, predicting whether or not overheating occurs for each shift clutch by comparing the derived predicted temperature value of the friction element for each shift clutch with an allowable temperature set for each shift clutch, and determining a target shift stage while avoiding the overheating clutch with a predicted temperature value exceeding the allowable temperature, through switching to an avoidance shift mode.

Systems and methods for operating a driveline disconnect clutch of a hybrid vehicle are presented. In one example, a driveline disconnect clutch pressure is measured just prior to a request to close the driveline disconnect clutch and a time duration for driveline disconnect clutch boost pressure is adjusted in response to the measured driveline disconnect clutch pressure.

The transmission control unit includes a gear ratio abnormality determination unit and a limp home control unit. The gear ratio abnormality determination unit is configured to determine that a gear ratio is abnormal when, during travelling at a predetermined gear position, a difference between an actual gear ratio, which is calculated based on a transmission input shaft rotation speed and a transmission output shaft rotation speed, and a set gear ratio at the predetermined gear position is equal to or greater than a set value. The limp home control unit is configured to, when the gear ratio abnormality determination unit determines that the gear ratio is abnormal, output a disengagement instruction for disengaging all of the plurality of friction elements, when it is confirmed that a neutral state is shifted to according to the output of the disengagement instruction, determine engagement/disengagement of a specific friction element among the plurality of friction elements based on rotation/stop information of a rotation member of the stepped transmission mechanism, and determine an evacuation gear position based on determination information on the engagement/disengagement of the specific friction element, and shift the gear position to the determined evacuation gear position.

A method for controlling wheel slip of a vehicle includes: observing and estimating equivalent inertia information of a driving system in real time based on operation information of the driving system by receiving the operation information of the driving system for driving the vehicle; calculating the compensated amount for compensating a torque command of a driving device from the equivalent inertia information of the driving system observed and estimated by a controller; compensating the torque command of the driving device by using the calculated compensated amount; and performing a control of a torque applied to a driving wheel according to the compensated torque command.

A control system for a hybrid vehicle that can reduce a power loss resulting from shifting an operating mode from motor mode to hybrid mode is provided. A transmission that is adapted to distribute torque applied to an input element to a reaction element and an output element, and to change a ratio between a first torque delivered to the reaction element and a second torque delivered to the output element. A controller is configured to start an engine in a high mode in which a torque ratio of the output element to the input element is small if the vehicle speed is higher than a threshold value, and to start the engine in a low mode in which the torque ratio is greater if the vehicle speed is lower than the threshold value.