Engine lubrication system

Patent metadata

Field	Value
Publication number	US-10988141-B2
Application number	US-202016930368-A
Country	US
Kind code	B2
Filing date	Jul 16, 2020
Priority date	Jul 25, 2019
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

An engine lubrication system including: an oil pump configured to be driven by an engine; an oil jet mechanism configured to inject oil pressure-fed by the oil pump to a piston; and circuitry configured to set a target hydraulic pressure of the oil injected from the oil jet mechanism according to an operation state of the engine; determine a hydraulic pressure state of the oil injected from the oil jet mechanism; and change a gear stage of the automatic transmission to a lower gear stage in a case that a predetermined condition between the determined hydraulic pressure state and the target hydraulic pressure is satisfied.

First claim

The invention claimed is:

1. An engine lubrication system comprising:
an oil pump configured to be driven by an engine;
an oil jet mechanism configured to inject oil pressure-fed by the oil pump to a piston of the engine; and
circuitry configured to
set a target hydraulic pressure of the oil injected from the oil jet mechanism according to an operation state of the engine;
determine a hydraulic pressure state of the oil injected from the oil jet mechanism; and
change a gear stage of the automatic transmission to a lower gear stage in a case that a predetermined condition is satisfied, wherein the predetermined condition includes the determined hydraulic pressure being below the target hydraulic pressure.

2. The engine lubrication system of claim 1 , further comprising:
the automatic transmission.

3. The engine lubrication system of claim 1 , further comprising:
one or more sensors configured to detect the hydraulic pressure of the oil injected from the oil jet mechanism.

4. The engine lubrication system of claim 3 , wherein
the predetermined condition is satisfied in a case that a deviation between the detected hydraulic pressure and the target hydraulic pressure is equal to or larger than a threshold value for a predetermined period of time.

5. The engine lubrication system of claim 1 , further comprising:
a sensor configured to detect a temperature of the oil injected from the oil jet mechanism.

6. The engine lubrication system of claim 5 , wherein
the circuitry is configured to perform control to return the gear stage, which has been changed to the lower gear stage, to a higher gear stage in a case that the detected oil temperature is equal to or higher than a set temperature.

7. The engine lubrication system of claim 5 , wherein
the predetermined condition includes the detected oil temperature being less than the set temperature.

8. The engine lubrication system of claim 1 , further comprising:
a gear shift map used for setting a gear stage of the automatic transmission based on one of plural gear shift lines defined with a vehicle speed and a load as parameters.

9. The engine lubrication system of claim 8 , wherein the circuitry is configured to control shifting at least one gear shift line of the plural gear shift lines to a higher speed in a case that the predetermined condition is satisfied.

10. The engine lubrication system according to claim 8 , wherein
the circuitry is configured to control shifting the gear shift line for a highest gear stage among the plural gear shift lines to a higher speed in a case that the predetermined condition is satisfied.

11. The engine lubrication system of claim 1 , further comprising:
one or more sensors configured to detect an oil temperature of the automatic transmission.

12. The engine lubrication system of claim 11 , wherein
the circuitry is configured to perform control to return the gear stage, which has been changed to the lower gear stage, to the original gear stage in a case that the detected oil temperature of the automatic transmission is equal to or higher than an automatic transmission set temperature.

13. The engine lubrication system according to claim 11 , wherein
the circuitry is configured to perform control to reduce engine output in a case that the detected oil temperature is equal to or higher than an automatic transmission set temperature.

14. A vehicle comprising:
an engine;
an automatic transmission;
an oil pump configured to be driven by the engine;
an oil jet mechanism configured to inject oil pressure-fed by the oil pump to a piston; and
circuitry configured to
determine a target hydraulic pressure of the oil injected from the oil jet mechanism based on an operation state of the engine;
detect a hydraulic pressure of the oil injected from the oil jet mechanism; and
change a gear stage of the automatic transmission to a lower gear stage in a case that a predetermined condition is satisfied, wherein the predetermined condition included the determined hydraulic pressure being below the target hydraulic pressure.

15. The vehicle of claim 14 , wherein
the predetermined condition is satisfied in a case that a deviation between the detected hydraulic pressure and the target hydraulic pressure is equal to or larger than a threshold value for a predetermined period of time.

16. A method performed by an engine lubrication system including an oil pump configured to be drive by an engine, and an oil jet mechanism configured to inject oil pressure-fed by the oil pump to a piston of the engine, the method comprising:
setting a target hydraulic pressure of the oil injected from the oil jet mechanism according to an operation state of the engine;
detecting a hydraulic pressure state of the oil injected from the oil jet mechanism; and
changing a gear stage of the automatic transmission to a lower gear stage in a case that a predetermined condition is satisfied, wherein the predetermined condition includes the determined hydraulic pressure being below the target hydraulic pressure.

17. The method of claim 16 , wherein
the predetermined condition is satisfied in a case that a deviation between the detected hydraulic pressure and the target hydraulic pressure is equal to or larger than a threshold value for a predetermined period of time.

Assignees

• Mazda Motor

Inventors

• Honda Kenta
• Hashimoto Masanori
• Fukuda Daisuke
• Yamada Atsushi
• Shimo Daisuke

Classifications

• F16H59/78

  Temperature · CPC title

• F16H2061/0227

  Shift map selection, i.e. methods for controlling selection between different shift maps, e.g. to initiate switch to a map for up-hill driving · CPC title

• B60W2510/1075

  fluid pressure, e.g. oil pressure · CPC title

• F16H61/0213

  characterised by the method for generating shift signals · CPC title

• F16H2061/0232

  Selecting ratios for bringing engine into a particular state, e.g. for fast warming up or for reducing exhaust emissions · CPC title