Apparatus, system, and vehicle control apparatus

Patent metadata

Field	Value
Publication number	US-11614131-B2
Application number	US-202117370632-A
Country	US
Kind code	B2
Filing date	Jul 8, 2021
Priority date	Aug 6, 2020
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

An apparatus to be applied to a vehicle including a transmission configured to execute a gear shifting operation for changing a gear ratio by engaging or disengaging friction engagement elements having friction members pushed by a piston that moves through hydraulic pressure supply to an oil chamber, the apparatus including: a memory storing mapping data for defining mapping, the mapping including a pressure variable and a period variable as input variables, the mapping including a stroke amount as an output variable, the pressure variable indicating a waiting pressure, the period variable indicating a waiting period; and a processor configured to: acquire values of the input variables, and calculate a value of the output variable by inputting, to the mapping, the acquired values of the input variables.

First claim

What is claimed is:

1. An apparatus to be applied to a vehicle including a transmission configured to execute a gear shifting operation for changing a gear ratio between an on-board prime mover and a driving wheel by engaging or disengaging friction engagement elements having friction members pushed by a piston that moves through hydraulic pressure supply to an oil chamber, the apparatus comprising:
a memory storing mapping data for defining mapping, the mapping including a pressure variable and a period variable as input variables, the mapping including a stroke amount as an output variable, the pressure variable indicating a waiting pressure, the period variable indicating a waiting period, a hydraulic pressure supplied to the oil chamber for pack filling to bring the disengaged friction engagement elements into a state immediately before engagement being defined as the waiting pressure, a movement amount of the piston during a period from the hydraulic pressure supply to the oil chamber to completion of the pack filling is defined as the stroke amount of the piston, the period required from the hydraulic pressure supply to the oil chamber to the completion of the pack filling is defined as the waiting period; and
a processor configured to execute steps of:
acquiring values of the input variables, and
calculating a value of the output variable by inputting, to the mapping, the acquired values of the input variables, and
reducing wear of the friction members when the stroke amount calculated by the processor is larger than a reference stroke amount calculated based on a total traveling distance of the vehicle,
wherein the step of reducing wear of the friction members includes shortening an engagement period of relative rotation between first plates and second plates of the friction members.

2. The apparatus according to claim 1 , wherein the input variables include an oil temperature variable indicating a temperature of hydraulic oil supplied to the oil chamber.

3. The apparatus according to claim 1 , wherein the waiting pressure is a pressure to be changed to increase as an output torque of the on-board prime mover increases, and
the input variables include a torque variable indicating the output torque.

4. The apparatus according to claim 1 , wherein the transmission includes a plurality of the friction engagement elements, and
the input variables include a gear shifting variable indicating the friction engagement elements engaged in gear shifting.

5. The apparatus according to claim 1 , wherein a period from the hydraulic pressure supply to the oil chamber to a start of an inertia phase in a process of gear shifting is acquired as the period variable.

6. The apparatus according to claim 1 , wherein the processor is further configured to execute a step of calculating a wear amount of the friction members by subtracting an initial value of the stroke amount from the stroke amount calculated by the processor.

7. The apparatus according to claim 1 , wherein shortening the engagement period includes executing a process for increasing a rate of increase in the hydraulic pressure in a sweep control to be executed in the engagement period.

8. A system comprising:
a memory storing mapping data for defining mapping, the mapping including a pressure variable and a period variable as input variables, the mapping including a stroke amount as an output variable, the pressure variable indicating a waiting pressure, the period variable indicating a waiting period, in a vehicle including a transmission configured to execute a gear shifting operation for changing a gear ratio between an on-board prime mover and a driving wheel by engaging or disengaging friction engagement elements having friction members pushed by a piston that moves through hydraulic pressure supply to an oil chamber, a hydraulic pressure supplied to the oil chamber for pack filling to bring the disengaged friction engagement elements into a state immediately before engagement being defined as the waiting pressure, a movement amount of the piston during a period from the hydraulic pressure supply to the oil chamber to completion of the pack filling is defined as the stroke amount of the piston, the period required from the hydraulic pressure supply to the oil chamber to the completion of the pack filling is defined as the waiting period;
a first processor provided in the vehicle; and
a second processor provided outside the vehicle,
wherein the first processor is configured to execute steps of:
acquiring values of the input variables,
transmitting acquired data,
receiving a result of calculation from the second processor, and
reducing wear of the friction members when the stroke amount calculated by the second processor is larger than a reference stroke amount calculated based on a total traveling distance of the vehicle, and

the second processor is configured to execute steps of:
receiving data transmitted by the first processor,
calculating, as the result of calculation, a value of the output variable by inputting, to the mapping, the acquired values of the input variables, and
transmitting the result of calculation, and

the step of reducing wear of the friction members includes shortening an engagement period of relative rotation between first plates and second plates of the friction members.

9. The system according to claim 8 , wherein shortening the engagement period includes executing a process for increasing a rate of increase in the hydraulic pressure in a sweep control to be executed in the engagement period.

10. A vehicle control apparatus comprising a first processor configured to execute steps of:
acquiring values of input variables,
transmitting acquired data, and
receiving a result of calculation from a second processor, and
reducing wear of friction members when a stroke amount calculated by a second processor is larger than a reference stroke amount calculated based on a total traveling distance of a vehicle,
wherein the step of reducing wear of the friction members includes shortening an engagement period of relative rotation between first plates and second plates of the friction members.

11. The vehicle control apparatus according to claim 10 , wherein shortening the engagement period includes executing a process for increasing a rate of increase in the hydraulic pressure in a sweep control to be executed in the engagement period.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tabata Atsushi
• Okuda Koichi
• Fujii Kota
• Imamura Ken

Classifications

• F16D2500/7041

  Position · CPC title

• F16D2500/5023

  Determination of the clutch wear · CPC title

• F16D2500/3024

  Pressure · CPC title

• F16D25/0638

  with more than two discs, e.g. multiple lamellae · CPC title

• F16D48/062 Primary

  of a clutch system with a plurality of fluid actuated clutches · CPC title