System and method for engine valve lash calibration

Patent metadata

Field	Value
Publication number	US-11268411-B2
Application number	US-202016894357-A
Country	US
Kind code	B2
Filing date	Jun 5, 2020
Priority date	Jun 5, 2020
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A method for adjusting a valve lash in an internal combustion engine includes receiving a first signal generated by a sensor secured to the internal combustion engine, the first signal being indicative of a closing of a valve, receiving a second signal indicative of at least one of an engine speed of the internal combustion engine or a position of a camshaft of the internal combustion engine, and automatically determining an adjusted amount of lash associated with the valve based on the received first signal and the received second signal. The method also includes comparing the adjusted amount of lash to at least one predetermined threshold, and providing, in response to determining that the adjusted amount of lash is greater than the at least one predetermined threshold, a valve lash re-adjustment notification.

First claim

What is claimed is:

1. A method for adjusting a valve lash in an internal combustion engine, the method comprising:
receiving a first signal generated by a sensor secured to the internal combustion engine, the first signal being indicative of a closing of a valve;
receiving a second signal indicative of at least one of an engine speed of the internal combustion engine or a position of a camshaft of the internal combustion engine;
automatically determining an adjusted amount of lash associated with the valve based on the received first signal and the received second signal;
comparing the adjusted amount of lash to at least one predetermined threshold;
providing, in response to determining that the adjusted amount of lash is greater than the at least one predetermined threshold, a valve lash re-adjustment notification; and
wirelessly transmitting the notification for inclusion as a part of a service maintenance record for the internal combustion engine.

2. The method of claim 1 , wherein the first signal is a vibration signal.

3. The method of claim 1 , wherein the second signal is an engine status signal indicative of the engine speed of the internal combustion engine.

4. The method of claim 1 , wherein comparing the adjusted amount of lash comprises comparing the adjusted amount of lash to a first predetermined threshold and a second predetermined threshold.

5. The method of claim 4 , wherein the first predetermined threshold corresponds to a need to correct the adjusted valve lash, and the second predetermined threshold corresponds to a need to discontinue operation of the internal combustion engine.

6. The method of claim 1 , further comprising:
providing, in response to determining that the adjusted amount of lash is not greater than the at least one predetermined threshold, a notification indicating that the adjusted amount of lash is acceptable.

7. The method of claim 1 , further comprising:
receiving respective vibration signals from a plurality of sensors associated with respective ones of the plurality of individual cylinders.

8. The method of claim 1 , wherein receiving the second signal includes receiving the engine speed and the position of the camshaft of the internal combustion engine from an engine control module.

9. A system for adjusting a valve lash in an internal combustion engine, comprising:
at least one processor; and
at least one non-transitory computer readable medium storing instructions which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
receiving a first signal generated by a sensor secured to the internal combustion engine, the first signal being indicative of a closing of a valve;
receiving a second signal indicative of at least one of an engine speed of the internal combustion engine or a position of a camshaft of the internal combustion engine;
automatically determining an adjusted amount of lash associated with the valve based on the received first signal and the received second signal;
comparing the adjusted amount of lash to at least one predetermined threshold; and
providing, in response to determining that the adjusted amount of lash is greater than the at least one predetermined threshold, a valve lash re-adjustment notification,
wherein comparing the adjusted amount of lash comprises comparing the adjusted amount of lash to a first predetermined threshold and a second predetermined threshold, wherein the first predetermined threshold corresponds to a need to correct the adjusted valve lash, and the second predetermined threshold corresponds to a need to discontinue operation of the internal combustion engine.

10. The system of claim 9 , wherein the first signal is a vibration signal.

11. The system of claim 9 , wherein the second signal is an engine status signal.

12. The system of claim 9 , the operations further comprising:
providing, in response to determining that the adjusted amount of lash is not greater than the at least one predetermined threshold, a notification indicating that the adjusted amount of lash is acceptable.

13. The system of claim 9 , the operations further comprising:
automatically determining, by the at least one processor, an adjusted amount of lash associated with each of a plurality of individual cylinders.

14. A method for calibrating a valve lash in an internal combustion engine, the method comprising:
receiving a first signal indicative of a closing of a valve of the internal combustion engine following an adjustment in an amount of the valve lash in the internal combustion engine;
receiving a second signal indicative of at least one of an engine speed of the internal combustion engine or a position of a camshaft of the internal combustion engine;
determining a magnitude of the adjusted amount of valve lash based on at least the received first signal and the received second signal;
comparing the magnitude of the adjusted amount of valve lash to a lash adjustment map; and
transmitting, based on the comparison between the magnitude of the adjusted amount of valve lash and the lash adjustment map, a valve lash re-adjustment notification,
wherein the lash adjustment map includes at least a first predetermined threshold and a second predetermined threshold, wherein the first predetermined threshold corresponds to a need to modify the adjusted valve lash, and the second predetermined threshold corresponds to a need to discontinue operation of the internal combustion engine.

15. The method of claim 14 , further comprising:
providing, in response to determining that the amount of lash is not greater than the at least one predetermined threshold, a notification indicating that the adjusted amount of lash is acceptable.

16. The method of claim 14 , wherein the first signal is a vibration signal.

17. The method of claim 14 , wherein the second signal is an engine status signal.

Assignees

• Caterpillar Inc

Inventors

• Lu Yifeng
• Zhang Yanchai
• Dong Zhaoxu
• Pauli Nathan S
• Hu Xuefei
• Nalla Purna C
• Young Brian W
• Siegle James D

Classifications

• G07C5/085

  using electronic data carriers · CPC title

• F01L1/20 Primary

  Adjusting or compensating clearance · CPC title

• F02B77/082

  relating to valves · CPC title

• F01L2820/045

  Valve lift · CPC title

• F01L2820/042

  Crankshafts position · CPC title