CONTROL APPARATUS FOR CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A control apparatus for a continuously variable transmission is capable of continuously changing an output of an internal combustion engine mounted on a vehicle and allowing a transmission mode to be switchable between a continuous transmission mode in which a transmission ratio is set continuously and a stepped transmission mode in which the transmission ratio is set stepwise. A transmission mode selector is configured to change the transmission mode in such a manner that in a case where the stepped transmission mode is selected, when a engine rotation speed reaches a first predetermined rotation speed, then falls below a second predetermined rotation speed which is lower than the first predetermined rotation speed, and further falls below a third predetermined rotation speed, the transmission mode is switched from the stepped transmission mode to the continuous transmission mode.

主权项

1. A control apparatus for a continuously variable transmission, the control apparatus being capable of continuously changing an output of an internal combustion engine mounted on a vehicle and allowing a transmission mode to be switchable between a continuous transmission mode in which a transmission ratio is set continuously and a stepped transmission mode in which the transmission ratio is set stepwise, the control apparatus comprising:
a driving condition parameter detector configured to detect a driving condition parameter which indicates a driving condition of the vehicle; an engine rotation speed detector configured to detect an engine rotation speed; a drive feeling setting device to set a drive feeling for the vehicle; a predetermined rotation speed setting device configured to set one of a first predetermined rotation speed, a second predetermined rotation speed and a third predetermined rotation speed according to a setting condition for drive feeling in the drive feeling setting device; a transmission mode selector configured to select one of the continuous transmission mode and the stepped transmission mode as the transmission mode; and a transmission ratio controller configured to control the transmission ratio according to the driving condition parameter detected by the driving condition parameter detector and the transmission mode selected by the transmission mode selector, the transmission ratio controller being configured to control the transmission ratio in such a manner that in a case where the stepped transmission mode is selected, when the engine rotation speed reaches the first predetermined rotation speed, the transmission ratio is controlled at a value for a higher speed, different from a value before the engine rotation speed reaches the first predetermined rotation speed so that the engine rotation speed becomes lower than the first predetermined rotation speed, wherein the transmission mode selector is configured to change the transmission mode in such a manner that in a case where the stepped transmission mode is selected, when the engine rotation speed reaches the first predetermined rotation speed, then falls below the second predetermined rotation speed which is lower than the first predetermined rotation speed, and further falls below the third predetermined rotation speed, the transmission mode is switched from the stepped transmission mode to the continuous transmission mode.