Control apparatus and control method for continuously variable transmission

A control apparatus for a continuously variable transmission including a hydraulic clutch by which driving power between a power source and a driving wheel is switched to either a transmission state or a non-transmission state based on an occupant's operation, the control apparatus comprising:

• a reducing unit for temporarily reducing a hydraulic pressure supplied to said clutch such that said clutch waits in said non-transmission state, when an occupant performs an operation of switching said clutch from said non-transmission state to said transmission state before a predetermined time period has elapsed since said power source started up;
• and
• a control unit for, when the hydraulic pressure supplied to said clutch is increased after temporary reduction by said reducing unit, controlling at least any one of an amount of increase in the hydraulic pressure supplied to said clutch and a time period for which the hydraulic pressure supplied to said clutch is increased, based on a state related to a control response of said clutch at an end of said temporary reduction,
• said control unit determining that the control response of said clutch is high and decreasing at least any one of the amount of increase in the hydraulic pressure supplied to said clutch and the time period for which the hydraulic pressure supplied to said clutch is increased, more greatly when a duration of said temporary reduction is long than when the duration of said temporary reduction is short.

A control apparatus for a continuously variable transmission including a hydraulic clutch by which driving power between a power source and a driving wheel is switched to either a transmission state or a non-transmission state based on an occupant's operation, the control apparatus comprising:

• a reducing unit for temporarily reducing a hydraulic pressure supplied to said clutch such that said clutch waits in said non-transmission state, when an occupant performs an operation of switching said clutch from said non-transmission state to said transmission state before a predetermined time period has elapsed since said power source started up;
• and
• a control unit for, when the hydraulic pressure supplied to said clutch is increased after temporary reduction by said reducing unit, controlling at least any one of an amount of increase in the hydraulic pressure supplied to said clutch and a time period for which the hydraulic pressure supplied to said clutch is increased, based on a state related to a control response of said clutch at an end of said temporary reduction,
• said reducing unit temporarily reducing the hydraulic pressure supplied to said clutch, for a time period from a first timing when the operation of switching said clutch to said transmission state is performed to a second timing when said predetermined time period has elapsed since said power source started up, and
• said control unit detecting a time period from startup of said power source to said first timing, and when the hydraulic pressure supplied to said clutch is increased after said second timing, said control unit decreasing at least any one of the amount of increase in the hydraulic pressure supplied to said clutch and the time period for which the hydraulic pressure supplied to said clutch is increased, more greatly when the time period from startup of said power source to said first timing is short than when the time period from startup of said power source to said first timing is long.

A control method executed by a control apparatus for a continuously variable transmission including a hydraulic clutch by which driving power between a power source and a driving wheel is switched to either a transmission state or a non-transmission state based on an occupant's operation, the control method comprising the steps of

• temporarily reducing a hydraulic pressure supplied to said clutch such that said clutch waits in said non-transmission state, when an occupant performs an operation of switching said clutch from said non-transmission state to said transmission state before a predetermined time period has elapsed since said power source started up;
• and
• when the hydraulic pressure supplied to said clutch is increased after temporary reduction by said step of temporarily reducing a hydraulic pressure supplied to said clutch, controlling at least any one of an amount of increase in the hydraulic pressure supplied to said clutch and a time period for which the hydraulic pressure supplied to said clutch is increased, based on a state related to a control response of said clutch at an end of said temporary reduction,
• said step of controlling at least any one of an amount of increase in the hydraulic pressure supplied to said clutch and a time period for which the hydraulic pressure supplied to said clutch is increased including the step of determining that the control response of said clutch is high and decreasing at least any one of the amount of increase in the hydraulic pressure supplied to said clutch and the time period for which the hydraulic pressure supplied to said clutch is increased, more greatly when a duration of said temporary reduction is long than when the duration of said temporary reduction is short.

A control method executed by a control apparatus for a continuously variable transmission including a hydraulic clutch by which driving power between a power source and a driving wheel is switched to either a transmission state or a non-transmission state based on an occupant's operation, the control method comprising the steps of

• temporarily reducing a hydraulic pressure supplied to said clutch such that said clutch waits in said non-transmission state, when an occupant performs an operation of switching said clutch from said non-transmission state to said transmission state before a predetermined time period has elapsed since said power source started up;
• and
• when the hydraulic pressure supplied to said clutch is increased after temporary reduction by said step of temporarily reducing a hydraulic pressure supplied to said clutch, controlling at least any one of an amount of increase in the hydraulic pressure supplied to said clutch and a time period for which the hydraulic pressure supplied to said clutch is increased, based on a state related to a control response of said clutch at an end of said temporary reduction,
• said step of temporarily reducing a hydraulic pressure supplied to said clutch including the step of temporarily reducing the hydraulic pressure supplied to said clutch, for a time period from a first timing when the operation of switching said clutch to said transmission state is performed to a second timing when said predetermined time period has elapsed since said power source started up, and said step of controlling including the steps of
• detecting a time period from startup of said power source to said first timing, and
• when the hydraulic pressure supplied to said clutch is increased after said second timing, decreasing at least any one of the amount of increase in the hydraulic pressure supplied to said clutch and the time period for which the hydraulic pressure supplied to said clutch is increased, more greatly when the time period from startup of said power source to said first timing is short than when the time period from startup of said power source to said first timing is long.