A line pressure control method for a dual-clutch transmission (DCT), may include a hydraulic-pressure-decreasing operation of interrupting, by a controller, the supply of current to an electric oil pump and estimating a decrease in a line pressure using a line pressure model based on a pressure accumulator mounted in a hydraulic pressure line, a pump-driving operation of, when the estimated line pressure is equal to or less than a predetermined lower-limit value, driving, by the controller, the electric oil pump, and a hydraulic-pressure-increasing operation of determining, by the controller, the line pressure based on the current supplied to the electric oil pump and to determine whether the determined line pressure is equal to or greater than a predetermined upper-limit value.

A transmission controller of a toroidal continuously variable transmission includes a gain setting unit that adjusts a gain of closed-loop control for calculating a target value of a roller position in accordance with a change in a rotation speed of a disc in a first rotation speed range and a second rotation speed range higher than the first rotation speed range. The gain setting unit changes, in the first rotation speed range, the gain so that sensitivity of the closed-loop control decreases with an increase in the rotation speed, and changes, in the second rotation speed range, the gain so that a rate of decrease in the sensitivity of the closed-loop control with the increase in the rotation speed is smaller than that in the first rotation speed range.

A shift control method for a hybrid vehicle having a dual clutch transmission may include an undershoot determination step of determining, by a controller, whether the amount of undershoot occurring during an inertia phase of power-off upshift is equal to or greater than a prescribed reference amount, a response-starting step of starting, by the controller, when the amount of undershoot is equal to or greater than the prescribed reference amount, coordinated engine torque control using a first coordinated torque, which is determined as the larger one of engine model torque determined from a model and engine map torque obtained from a map in a response to clutch slippage, and a response-maintaining step of determining, by the controller, second coordinated torque to control the engine and controlling engine torque until the inertia phase is completed.

A line pressure control method for a dual-clutch transmission (DCT), may include a hydraulic-pressure-decreasing operation of interrupting, by a controller, the supply of current to an electric oil pump and estimating a decrease in a line pressure using a line pressure model based on a pressure accumulator mounted in a hydraulic pressure line, a pump-driving operation of, when the estimated line pressure is equal to or less than a predetermined lower-limit value, driving, by the controller, the electric oil pump, and a hydraulic-pressure-increasing operation of determining, by the controller, the line pressure based on the current supplied to the electric oil pump and to determine whether the determined line pressure is equal to or greater than a predetermined upper-limit value.

An arrangement for determining a vehicle speed behaviour model for a leading vehicle, where the leading vehicle drives along a path in front of a trailing host vehicle and where the determination is done by a control unit in the host vehicle, where the host vehicle includes an arrangement for measuring the time gap to the leading vehicle, an arrangement for measuring the speed of the host vehicle, an arrangement for obtaining external information regarding an upcoming change in a road condition, where the control unit is adapted for monitoring the change in vehicle speed of the leading vehicle, and for determining a vehicle speed behaviour model for the leading vehicle based on the monitored change in vehicle speed of the leading vehicle. The vehicle speed behaviour of a leading vehicle can be used by the host vehicle to optimize the fuel consumption, the comfort and the safety of the host vehicle.

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 the dynamically expanding play correction according to a method for hysteresis compensation for an actuator and for a shift fork which is movable by this actuator via an electric motor having a rotor and a stator and which guides a gearshift sleeve, by means of a cellular automaton, wherein a torque ripple of the actuator and a mechanical displacement of the gearshift sleeve are compensated independently of one another or in combination by means of a learning algorithm.

A method for CVT low oil pressure input clutch fill compensation includesperforming a garage shift when a modeled fill pressure is equal to a commanded modeled fill pressure. Then the line pressure is checked to determine if it is less than the commanded fill pressure when performing the garage shift. If so, then the modeled fill pressure is set to the line pressure and the primary and secondary actual pulley pressures are read by sensing devices. Next, the primary and secondary commanded pulley pressures are checked to determine if they are greater than the modeled fill pressure. If so, then a first dPressure value for the flow rate model based on the lowest of the modeled fill pressure, the primary actual pulley pressure, or the secondary actual pulley pressure is determined and it is used to compensate the flow rate model.

A method for CVT low oil pressure input clutch fill compensation includesperforming a garage shift when a modeled fill pressure is equal to a commanded modeled fill pressure. Then the line pressure is checked to determine if it is less than the commanded fill pressure when performing the garage shift. If so, then the modeled fill pressure is set to the line pressure and the primary and secondary actual pulley pressures are read by sensing devices. Next, the primary and secondary commanded pulley pressures are checked to determine if they are greater than the modeled fill pressure. If so, then a first dPressure value for the flow rate model based on the lowest of the modeled fill pressure, the primary actual pulley pressure, or the secondary actual pulley pressure is determined and it is used to compensate the flow rate model.

Provided herein is a computer-implemented system for a ball-planetary variator (CVP) having a plurality of tiltable balls supported in a carrier, the computer-implemented system including: a digital processing device including an operating system configured to perform executable instructions and a memory device; a computer program including instructions executable by the digital processing device and including a shift actuator controller configured to control a plurality of operating conditions of the CVP; and a plurality of sensors configured to monitor the operating conditions of the CVP including: a CVP speed ratio setpoint and an input torque to the CVP. The shift actuator controller includes an actuator force model configured to provide a shift force setpoint based on the CVP speed ratio set point and the input torque to the CVP and commands a change in a carrier position of the CVP based at least in part on the shift force setpoint.