Oil pressure learning method of automatic transmission, control device thereof, and control system thereof

A control device of an automatic transmission, the automatic transmission being mounted on a vehicle, connected to a power source of the vehicle, and including at least one of a brake and a clutch as a friction engaging element, the control device comprising:

• a storage device configured to store relational regulation data used for regulating a relationship between a state of the vehicle and an oil pressure command value, which is a pressure of oil supplied to the automatic transmission when the friction engaging element that switches gear stages of the automatic transmission is engaged;
• and
• an execution device configured to:
• acquire the state of the vehicle;
• supply, when the friction engaging element that switches the gear stages of the automatic transmission is engaged, oil to the automatic transmission such that the value of the pressure of the supplied oil is set to the oil pressure command value determined by the acquired state of the vehicle and the relational regulation data;
• calculate, when the friction engaging element is engaged, as a specific variable, at least one of a variable representing an amount in which a detected input rotation speed of the automatic transmission exceeds a target input rotation speed of the automatic transmission, a variable representing a gear-shift time from a start of switching of the gear stages to a completion of the switching, and a variable representing an amount of heat generated in the automatic transmission;
• calculate a reward in a manner in which the reward has a larger value when the acquired specific variable satisfies a criterion than when the acquired specific variable does not satisfy the criterion;
• update the relational regulation data by inputting, to an update mapping determined in advance, the calculated reward and the oil pressure command value, the reward being calculated when the friction engaging element is engaged;
• and
• calculate a torque variable having a value that is increased as an amount of change in an input torque of the automatic transmission is increased when the friction engaging element is engaged, wherein:
• the update mapping outputs the relational regulation data that is updated to increase an expected profit for the reward when the friction engaging element is engaged according to the relational regulation data;
• and
• the execution device is configured to, when the amount of change in the input torque represented by the calculated torque variable is equal to or greater than a predetermined value that is determined in advance, regulate a change in the relational regulation data, the amount of change in the input torque being calculated when the friction engaging element is engaged.

A control system of an automatic transmission, the automatic transmission being mounted on a vehicle, connected to a power source of the vehicle, and including at least one of a brake and a clutch as a friction engaging element, the control system comprising:

• a storage device configured to store relational regulation data used for regulating a relationship between the state of the vehicle and an oil pressure command value, which is a pressure of oil supplied to the automatic transmission when the friction engaging element that switches gear stages of the automatic transmission is engaged;
• a first execution device mounted on the vehicle;
• and
• a second execution device, which is separate from the first execution device, wherein:
• the first execution device is configured to:
• acquire a state of the vehicle;
• and
• supply, when the friction engaging element that switches the gear stages of the automatic transmission is engaged, oil to the automatic transmission such that the value of the pressure of the supplied oil is set to the oil pressure command value determined by the acquired state of the vehicle and the relational regulation data,
• at least one of the first execution device and the second execution device is configured to:
• calculate, when the friction engaging element is engaged, as a specific variable, at least one of a variable representing an amount in which a detected input rotation speed of the automatic transmission exceeds a target input rotation speed of the automatic transmission, a variable representing a gear-shift time from a start of switching of the gear stages to a completion of the switching, and a variable representing an amount of heat generated in the automatic transmission;
• and
• calculate a reward in a manner in which the reward has a larger value when the acquired specific variable satisfies a criterion than when the acquired specific variable does not satisfy the criterion,
• the second execution device is configured to update the relational regulation data by inputting, to an update mapping determined in advance, the calculated reward and the oil pressure command value, the reward being calculated when the friction engaging element is engaged, and
• at least one of the first execution device and the second execution device is configured to calculate a torque variable having a value that is increased as an amount of change in an input torque of the automatic transmission is increased when the friction engaging element is engaged, wherein:
• the update mapping outputs the relational regulation data that is updated to increase an expected profit for the reward when the friction engaging element is engaged according to the relational regulation data;
• and
• the second execution device is configured to, when the amount of change in the input torque represented by the calculated torque variable is equal to or greater than a predetermined value that is determined in advance, regulate a change in the relational regulation data, the amount of change in the input torque being calculated when the friction engaging element is engaged.