초록 ▼

A control for a continuously variable transmission provides an improved transient performance by restraining proportional and integral terms when an error exceeds a predetermined value range. This is effective in suppressing an overshoot in driver pulley revolution speed in approaching to its target

A control for a continuously variable transmission provides an improved transient performance by restraining proportional and integral terms when an error exceeds a predetermined value range. This is effective in suppressing an overshoot in driver pulley revolution speed in approaching to its target speed. This control is provided with a safeguard against break down of a vehicle speed sensor such that the above mentioned restrain is removed when the vehicle speed indicative signal should drop to zero during running of the vehicle.

대표청구항 ▼

A control for a continuously variable transmission of a vehicle, wherein a shift in reduction ratio in the transmission is controlled by a shift actuator, the control comprising: means for detecting a vehicle speed of the vehicle and generating a vehicle speed indicative signal; means for determinin

A control for a continuously variable transmission of a vehicle, wherein a shift in reduction ratio in the transmission is controlled by a shift actuator, the control comprising: means for detecting a vehicle speed of the vehicle and generating a vehicle speed indicative signal; means for determining a target value of a predetermined variable indicative of the reduction ratio in the continuously variable transmission; means for detecting an actual value of the predetermined reduction ratio indicative variable; means for determining a feed-forward control value of the shift actuator in response to at least said vehicle speed indicative signal; means for calculating an error between said target value determined and said actual value detected, and for generating said calculated error as an error indicative signal when said calculated error falls in a first predetermined range which is defined by a first predetermined limit value and a second predetermined limit value, said error calculating means generating one of said first and second limit values as said error indicative signal when said calculated error fails to fall in said first predetermined range; means for determining a feed-back control value based on said error indicative signal, said feed-back control value including a proportional term variable with said error indicative signal; and means for controlling the shift actuator in response to a sum of said feed-forward and feed-back control values.