摘要:
A continuously variable transmission includes a hydrodynamic device, such as a fluid coupling or a torque converter, having a lock-up clutch. The reduction ratio of the continuously variable transmission is controlled by a shift motor. The shift motor is controlled such that each of rotary positions thereof corresponds uniquely to a desired optimum reduction ratio. Upon detecting a state wherein a rapid down shift is needed, the lock-up clutch is temporarily disengaged to allow the hydrodynamic device to slip during the rapid down shift.
摘要:
A continuously variable transmission includes a V-belt running over a drive pulley and a driven pulley. Upon rapid shifting in reduction ratio, a line pressure is increased temporarily to provide a proper V-belt gripping force to prevent slipping of the V-belt.
摘要:
The reduction ratio of a continuously variable transmission is controlled by a stepper motor. The stepper motor is controlled such that each of rotary positions thereof corresponds uniquely to a desired optimum reduction ratio indicative signal indicative of a desired optimum reduction ratio. The desired optimum reduction ratio indicative signal is generated for operating condition of an automotive vehicle.
摘要:
A method and an apparatus for controlling the reduction ratio of a continuously variable transmission are disclosed wherein normally the reduction ratio is controlled in response to a desired optimum reduction ratio indicative signal obtained by retrieving the data stored in a memory versus engine load and vehicle speed, but when more vehicle acceleration is needed, the reduction ratio is controlled by a corrected desired optimum reduction ratio indicative signal to increase the reduction ratio.
摘要:
A control system for a continuously variable V-belt transmission is disclosed wherein for the purpose of preventing an undesirable rapid drop in pressure in a cylinder chamber of a drive pulley a flow restrictor is provided to restrict the flow of oil discharged from the cylinder chamber upon rapid change in reduction ratio of the continuously variable V-belt transmission.
摘要:
The reduction ratio of a continuously variable transmission is controlled by a shift motor. The shift motor is controlled such that each of rotary positions thereof corresponds uniquely to a desired optimum reduction ratio. Upon detecting a state wherein a rapid shifting is needed, the shift motor is rotated at an increased revolution speed as compared to a normal revolution speed.
摘要:
A method and an apparatus controls a reduction ratio of a continuously variable transmission of an automotive vehicle, wherein the reduction ratio is increased when the depression degree of the accelerator pedal is increased rapidly for ensuring quick acceleration. When the depression degree of the accelerator pedal is decreased rapidly, the reduction ratio is held for a predetermined period of time. Under this condition, the reduction ratio may be controlled to accomplish a predetermined deceleration.
摘要:
A method and an apparatus for controlling the reduction ratio of a continuously variable transmission are disclosed wherein when an actual engine coolant temperature indicative signal is greater than or equal to a predetermined value indicative signal, a desired optimum reduction ratio signal is obtained by retrieving the desired optimum reduction ratio signal data stored in a memory versus an engine load and a vehicle speed. When the actual engine coolant temperature indicative signal is less than the predetermined value indicatiive signal, the same desired optimum reduction ratio signal data are retrieved based on a corrected signal which is obtained by correcting an engine load indicative signal or a vehicle speed indicative signal in order to provide a larger reduction ratio. Alternatively, another optimum reduction ratio signal data are retrieved when the actual engine coolant temperature indicative signal is less than the predetermined value indicative signal.
摘要:
The method features in that the speed at which a shift actuator operates in effecting an upshifting is slower than the speed at which the shift actuator operates in effecting a downshifting.
摘要:
A starting valve has a start fluid pressure regulating state and a complete engagement fluid pressure regulating state and supplies a regulated fluid pressure to a hydraulic clutch. A shift operating mechanism comprises a rod movable within a reduction ratio select range and an overstroke range. A complete engagement control valve has a spool operatively connected with the rod. When the rod is disposed within the reduction ratio select range, the complete engagement control valve renders the starting valve operable in the complete engagement fluid pressure regulating state, while when the rod is disposed within the overstroke range, the complete engagement control valve renders the starting valve operable in the start fluid pressure regulating state.