Transmission control device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorNaofumi Nishida
Life of this patent
Estimating the term…
Abstract
An output is calculated using, as an input, a measured value of a pump discharge pressure in a neural network having the pump discharge pressure as the input and a pump rotational speed as the output. A leakage degree of oil of the hydraulic circuit of a transmission is estimated based on a difference obtained by subtracting a measured value of the pump rotational speed from the calculated value of the output. Learning of the neural network is performed using, as teacher data, the measured values of the pump discharge pressure and the pump rotational speed in the transmission in which the leakage degree of oil is within an allowable range.
Claims9
A transmission control device for controlling a transmission mounted on a vehicle and equipped with a hydraulic circuit including an oil pump, a speed change mechanism that operates by receiving supply of oil to perform a shift operation of the transmission, and a hydraulic pressure control mechanism that controls an amount of oil supplied from the oil pump to the speed change mechanism, the transmission control device comprising:
- an execution device;
- and
- a storage device,
- wherein one of a state quantity indicating a discharge flow rate of oil of the oil pump and a state quantity indicating a discharge pressure of oil of the oil pump is an input-side evaluation state quantity and another is an output-side evaluation state quantity,
- a neural network having the input-side evaluation state quantity as an input and the output-side evaluation state quantity as an output is stored in the storage device,
- learning of the neural network is performed using, as teacher data, a measured value of the input-side evaluation state quantity in the transmission in which a leakage degree of oil is within an allowable range and a measured value of the output-side evaluation state quantity at a time of measurement of the input-side evaluation state quantity, and
- wherein the execution device executes
- a measurement process of measuring the input-side evaluation state quantity and the output-side evaluation state quantity,
- an arithmetic process of calculating an output of the neural network using the measured value of the input-side evaluation state quantity in the measurement process as the input,
- an estimation process of estimating the leakage degree of the hydraulic circuit based on a difference between a calculated value of the output of the neural network in the arithmetic process and the measured value of the output-side evaluation state quantity in the measurement process, and
- an output process of outputting an estimation result of the leakage degree in the estimation process.
Dependencies are inferred from the claim text.