Diagnostic systems and methods of a continuously variable transmission

Patent metadata

Field	Value
Publication number	US-10672207-B2
Application number	US-201815876343-A
Country	US
Kind code	B2
Filing date	Jan 22, 2018
Priority date	Jan 20, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A diagnostic system of a vehicle for diagnosing a drive belt of a continuously variable transmission. A diagnostic circuit detects or predicts a fault of the drive belt based on an operating parameter received from a sensor associated with the vehicle during a predetermined diagnostic period.

First claim

What is claimed is:

1. A vehicle diagnostic method of a vehicle including an internal combustion engine and a continuously variable transmission (CVT) operatively coupled to the internal combustion engine, the method comprising the steps of:
detecting at least one engine crankshaft acceleration variation event of the vehicle using a detection circuit;
determining at least one operating parameter received from one or more sensors associated with an operation of the CVT using a monitoring circuit; and
determining based on the at least one operating parameter when the at least one detected engine crankshaft acceleration variation is related to a fault of the drive belt of the CVT using an alert circuit.

2. The diagnostic method of claim 1 , further comprising including an environmental condition parameter as the at least one operating parameter, wherein the environmental condition parameter includes at least one of a fuel state signal, an engine coolant temperature signal, a drive belt temperature signal, and a clutch state signal.

3. The diagnostic method of claim 1 , further comprising including an engine-based parameter as the at least one operating parameter, wherein the engine-based parameter is related to at least one of a crankshaft acceleration signal, an engine torque signal, and a transmission gear position signal.

4. The diagnostic method of claim 1 , further comprising including a driveline-based parameter as the at least one operating parameter, wherein the driveline-based parameter is related to at least one of a vehicle speed signal, an engine speed signal, and a wheel speed signal.

5. The diagnostic method of claim 1 , further comprising detecting the at least one engine crankshaft acceleration variation event by measuring an acceleration or deceleration rate of a crankshaft acceleration signal.

6. The diagnostic method of claim 1 , further comprising performing a first correction method for determining whether the engine crankshaft acceleration variation event is caused by a belt slipping event or an engine combustion misfire event based on a single occurrence of the at least one engine crankshaft acceleration variation event.

7. The diagnostic method of claim 1 , further comprising performing a second correction method for determining whether the engine crankshaft acceleration variation event is caused by a belt slipping event or an engine combustion misfire event based on a plurality of occurrences of the at least one engine crankshaft acceleration variation event.

8. The method of claim 1 , wherein the step of detecting at least one engine crankshaft acceleration variation event of the vehicle using the detection circuit includes detecting a plurality of engine crankshaft acceleration variation events.

9. The method of claim 8 , further comprising the steps of
determining a frequency of the plurality of engine crankshaft acceleration variation events;
determining a CVT belt interaction frequency of a drive belt of the CVT; and
classifying the plurality of engine crankshaft acceleration variation events as one of an engine misfire event and a CVT belt damage event based on a comparison of the frequency to the CVT belt interaction frequency.

10. The diagnostic method of claim 1 , further comprising detecting the at least one engine crankshaft acceleration variation event based on a variation pattern of the operating parameter measured during a predetermined time period.

11. The diagnostic method of claim 10 , further comprising determining whether a frequency of the variation pattern is greater than a predetermined threshold.

12. The diagnostic method of claim 10 , further comprising determining whether a pattern time period of the variation pattern is greater than a predetermined time period.

13. The diagnostic method of claim 10 , further comprising determining whether a magnitude of the variation pattern.

14. A vehicle diagnostic method of a vehicle including an internal combustion engine and a continuously variable transmission (CVT) operatively coupled to the internal combustion engine, the method comprising the steps of:
determining at least one operating parameter received from one or more sensors associated with an operation of the CVT using a monitoring circuit;
detecting at least one belt slipping event of a drive belt of the CVT using a detection circuit;
determining based on the at least one operating parameter when the at least one detected belt slipping event is related to an impending fault of the drive belt of the CVT using an alert circuit; and
notifying the impending fault of the drive belt before belt or driveline damage of the vehicle occurs using the alert circuit.

15. The diagnostic method of claim 14 , further comprising generating an information signal related to the impending fault of the drive belt.

16. The diagnostic method of claim 14 , further comprising providing an option to override a user input by adjusting at least one value of the at least one operating parameter.

17. The diagnostic method of claim 14 , further comprising detecting the at least one belt slipping event by the detection circuit in at least one of a retroactive control mode and an active control mode.

18. The diagnostic method of claim 14 , further comprising receiving a desired vehicle input parameter using the monitoring circuit.

19. The diagnostic method of claim 14 , further comprising including an environmental condition parameter as the at least one operating parameter.

20. The diagnostic method of claim 14 , further comprising including an engine-based parameter as the at least one operating parameter.

21. The diagnostic method of claim 14 , further comprising including a driveline-based parameter as the at least one operating parameter.

22. The diagnostic method of claim 14 , further comprising detecting the belt slipping event based on a comparison of an engine-based parameter and a driveline-based parameter for predicting the impending fault of the drive belt.

23. The diagnostic method of claim 22 , further comprising determining whether at least one of the engine-based parameter and the driveline-based parameter is greater than a predetermined threshold.

24. The diagnostic method of claim 22 , further comprising informing the at least one detected belt slipping event using a display; and automatically adjusting the at least one operating parameter based on a predetermined table.

25. A vehicle diagnostic method of a vehicle including an internal combustion engine and a continuously variable transmission (CVT) operatively coupled to the internal combustion engine, the method comprising the steps of:
determining at least one operating parameter received from one or more sensors associated with an operation of the CVT using a monitoring circuit;
detecting at least one critical belt life event of a drive belt of the CVT using a detection circuit;
determining based on the at least one operating parameter when the at least one detected critical belt life event is related to a fault of the drive belt of the CVT using an alert circuit; and
generating an information signal related to a life of the drive belt using the alert circuit.

26. The diagnostic method of claim 25 , further comprising including an environmental condition parameter as the at least one operating parameter, wherein the environmental condition parameter includes a temperature signal.

27.

Assignees

• Polaris Inc

Inventors

• Carlson Ryan D
• Gillingham Brian R
• Kuhl Amery D
• Kallis John F
• Herrala Bruce E
• Grajkowski Karl J
• Oakden-Graus Jonathon P
• Nelson Stephen L

Classifications

• B60W50/0205 Primary

  Diagnosing or detecting failures; Failure detection models · CPC title

• F16H2057/014

  of friction elements in transmissions · CPC title

• F16H63/50

  Signals to an engine or motor · CPC title

• F16H57/01

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

• F16H2061/1208

  with diagnostic check cycles; Monitoring of failures · CPC title