Control device of automatic transmission

Patent metadata

Field	Value
Publication number	US-10677345-B2
Application number	US-201916238562-A
Country	US
Kind code	B2
Filing date	Jan 3, 2019
Priority date	Jan 17, 2018
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A control device of an automatic transmission controls an automatic transmission 1 comprising a transmission mechanism 3 including a plurality of engagement elements, and a hydraulic oil supply device 4 supplying hydraulic oil to the transmission mechanism The control device of the automatic transmission comprises an engagement element control part 41 configured to use the hydraulic oil supply device to make the plurality of engagement elements change between an engaged state and a disengaged state; and a deceleration degree calculating part 42 configured to calculate a target deceleration degree of a vehicle in which the automatic transmission is provided. The engagement element control part is configured to make the engagement element in the disengaged state engage so that the vehicle decelerates if the target deceleration degree is equal to or more than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

First claim

The invention claimed is:

1. A control device of an automatic transmission for controlling an automatic transmission comprising a transmission mechanism including a plurality of engagement elements and a hydraulic oil supply device supplying hydraulic oil to the transmission mechanism, comprising:
an engagement element control part configured to use the hydraulic oil supply device to make the plurality of engagement elements change between an engaged state and a disengaged state; and
a deceleration degree calculating part configured to calculate a target deceleration degree of a vehicle in which the automatic transmission is provided,
wherein the engagement element control part is configured to make an engagement element of the plurality of engagement elements in the disengaged state engage so that the vehicle decelerates if the target deceleration degree is equal to or more than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

2. The control device of an automatic transmission according to claim 1 , wherein the engagement element control part is configured to make a state of the engagement element change so that the vehicle does not decelerate if the target deceleration degree is less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

3. The control device of an automatic transmission according to claim 1 , further comprising a temperature raising part configured to make hydraulic oil in the automatic transmission rise in temperature, wherein
the temperature raising part is configured to make hydraulic oil in the automatic transmission rise in temperature without changing a state of the engagement element if the target deceleration degree is less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

4. The control device of an automatic transmission according to claim 1 , further comprising an oil temperature calculating part configured to calculate a temperature of the hydraulic oil around the engagement element, wherein
the engagement element control part is configured to make the engagement element in the disengaged state engage so that the vehicle decelerates if the target deceleration degree is equal to or more than a predetermined value and a temperature of the hydraulic oil around the engagement element is equal to or less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

5. The control device of an automatic transmission according to claim 4 , wherein the engagement element control part is configured to change a state of the engagement element so that the vehicle does not decelerate if the target deceleration degree is less than a predetermined value and the temperature of the hydraulic oil around the engagement element is equal to or less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

6. The control device of an automatic transmission according to claim 4 , further comprising a temperature raising part configured to make hydraulic oil in the automatic transmission rise in temperature, wherein
the temperature raising part is configured to make hydraulic oil in the automatic transmission rise in temperature without changing a state of the engagement element if a temperature of the hydraulic oil around the engagement element is higher than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

7. The control device of an automatic transmission according to claim 5 , further comprising a temperature raising part configured to make hydraulic oil in the automatic transmission rise in temperature, wherein
the temperature raising part is configured to make hydraulic oil in the automatic transmission rise in temperature without changing a state of the engagement element if a temperature of the hydraulic oil around the engagement element is higher than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

8. The control device of an automatic transmission according to claim 1 , further comprising a wear calculating part configured to calculate a degree of wear of the engagement element, wherein
the engagement element control part is configured to make the engagement element in the disengaged state engage so that the vehicle decelerates if the target deceleration degree is equal to or more than a predetermined value and the degree of wear of the engagement element is equal to or less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

9. The control device of an automatic transmission according to claim 8 , wherein the engagement element control part is configured to change a state of the engagement element so that the vehicle does not decelerate if the target deceleration degree is less than a predetermined value and the degree of wear of the engagement element is equal to or less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

10. The control device of an automatic transmission according to claim 8 , further comprising a temperature raising part configured to make hydraulic oil in the automatic transmission rise in temperature, wherein
the temperature raising part is configured to make hydraulic oil in the automatic transmission rise in temperature without changing the state of the engagement element if the degree of wear of the engagement element is greater than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

11. The control device of an automatic transmission according to claim 9 , further comprising a temperature raising part configured to make hydraulic oil in the automatic transmission rise in temperature, wherein
the temperature raising part is configured to make hydraulic oil in the automatic transmission rise in temperature without changing the state of the engagement element if the degree of wear of the engagement element is greater than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

12. The control device of an automatic transmission according to claim 1 , further comprising
an oil temperature calculating part configured to calculate a temperature of the hydraulic oil around the engagement element, and
a wear calculating part configured to calculate a degree of wear of the engagement element, wherein
the engagement element control part is configured to make the engagement element in the disengaged state engage so that the vehicle decelerates if the target deceleration degree is equal to or more than a predetermined value, the temperature of the hydraulic oil around the engagement element is equal to or less than a predetermined value, and the degree of wear of the engagement element is equal to or less than a predetermined value when an increase in temperature of hydraulic oil in the automatic transmission is demanded.

13. The control device of an automatic transmission according to claim 12 , wherein the engagement element control part is configured to change a state of the engagement element so that the vehicle does not decelerate if the target deceleration degree is less than a predetermined value, the temperature of the hydraulic oil around the engagement element is equal to or less than a predetermined value, and the degre

Assignees

• Toyota Motor Co Ltd

Inventors

• Watanabe Hiroshi
• Eiraku Akira
• Morita Koji

Classifications

• F16H57/01

  Monitoring wear or stress of gearing elements, e.g. for triggering maintenance · CPC title

• F16D2500/70426

  Clutch slip · CPC title

• F16D2500/1085

  Automatic transmission · CPC title

• F16D2500/1045

  Friction clutch · CPC title

• F16H59/72

  dependent on oil characteristics, e.g. temperature, viscosity · CPC title