4438results about "Clutches" patented technology

A hydraulic circuit may include a proportional control solenoid valve controlling hydraulic pressure such that an operating hydraulic pressure required by the friction member is supplied to the friction member; a supply hydraulic path connecting the proportional control solenoid valve with the friction member, and adapted to supply hydraulic pressure controlled by the proportional control solenoid valve to the friction member; and a switch valve disposed in the supply hydraulic path so as to selectively open / close the supply hydraulic path.

A hybrid vehicle drive control system has a first clutch interposed between an engine and a motor / generator, a transmission including several gear position clutches arranged between the motor / generator and a drive wheel, and a controller. The controller selectively starts the engine using torque from the first clutch during a mode drive change from an electric drive mode to a hybrid drive mode. When an engine start command occurs during the drive mode change, the controller selects the engaged gear position clutch that has the maximum torque transfer capacity from the engaged clutches constituting a vehicle running gear occurring during an engine starting process as a second clutch to be controlled. Then the controller executes a slip control of the second clutch when the first clutch is being connected to start the engine during the mode change from the electric drive mode to the hybrid drive mode.

The present invention makes it possible to start the engine when switching from the electric driving (EV) mode to the hybrid (HEV) mode without feeling of torque loss and with low impact. At t1 when the EV→HEV mode switching request increases with the acceleration, the control is started using the mode 2301b, and the transmission torque capacity tTc1 of the first clutch for HEV is increased for driving force control. Before the second clutch for EV&HEV starts to slip, The PTO shaft of the engine is started to rotate by the drag of the first clutch. In the mode 2301b, the second clutch transmission torque capacity tTc2 is maintained at the maximum driving force evTmax in the EV mode. Switch to mode 2303 at t2 when the second clutch starts to slip, and determine tTc2 so that the second clutch slips and start the engine caused by the drag of the first clutch, and tTc1 is determined to maintain the increase in driving force and the stability of the second clutch slide.

A method for controlling the drive unit of a vehicle in which an extended overrun mode having reduced fuel consumption and reduced pollutant emission is possible. A free-wheel mode in which the vehicle operates with the clutch disengaged is set as a function of a driving situation or an operating state of the drive unit. An output variable of the drive unit, such as torque or vehicle speed, is set to a constant value during the transition between an engaged-clutch travel mode and a free-wheel mode.

A method of controlling the timing of the shift events of a dual clutch transmission that includes the steps of sensing the current output speed of the transmission, determining the time required to complete each possible shift event within the transmission, and determining an output speed modification value for each possible shift event. The method also includes the steps of determining a modified shift point output speed for each possible shift event by summing the determined output speed modification value with a predetermined shift pattern output speed, and commanding the shift when the current output speed reaches the determined modified shift point output speed.

A hybrid vehicle drive control system is configured to perform engine startup when switching from an electric drive mode to a hybrid drive mode, without creating a sense of output torque loss. In particular, a controller selectively controls a first clutch disposed between the engine and the motor / generator and a second clutch disposed between the motor / generator and a drive wheel to switch between an electric drive mode in which the first clutch is released and the second clutch is engaged, and a hybrid drive mode in which both the first and second clutches are engaged. The controller sets the second torque transfer capacity to a value that is more than zero and less than the target motor / generator torque of the motor / generator when switching from the electric drive mode to the hybrid drive mode and when starting the engine.