Method of avoiding low cycle fatigue failure of turbochargers
First Claim
1. A method of avoiding low cycle fatigue failure of a turbocharger for an internal combustion engine having an electronic control module comprising the steps of:
- counting the number of cycles the speed of the turbocharger exceeds a high predetermined speed for a period of time and then drops below a lower predetermined speed for a period of time;
determining an allowable number of said speed cycles that the turbocharger can experience without low cycle fatigue failure;
comparing the counted number of speed cycles to the allowed number of speed cycles; and
providing a signal that will alert an operator that the turbocharger is approaching low cycle fatigue failure.
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Accused Products
Abstract
A method of avoiding low cycle fatigue failure of a turbocharger for an internal combustion engine having an electronic control module comprising the steps of: counting the number of cycles the speed of the engine and the fuel rate exceed a predetermined combination for a period of time and then drop below a lower predetermined combination for a period of time, determining an allowable number of said speed cycles that the turbocharger can experience without low cycle fatigue failure, comparing the counted number of speed cycles to the allowed number of speed cycles, providing an indication of the percentage of the counted speed cycles compared to the allowable number of speed cycles, and providing a signal that will alert an operator that the turbocharger is approaching low cycle fatigue failure.
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Citations
17 Claims
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1. A method of avoiding low cycle fatigue failure of a turbocharger for an internal combustion engine having an electronic control module comprising the steps of:
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counting the number of cycles the speed of the turbocharger exceeds a high predetermined speed for a period of time and then drops below a lower predetermined speed for a period of time; determining an allowable number of said speed cycles that the turbocharger can experience without low cycle fatigue failure; comparing the counted number of speed cycles to the allowed number of speed cycles; and providing a signal that will alert an operator that the turbocharger is approaching low cycle fatigue failure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electronic control module for an internal combustion engine having a turbocharger, wherein the control module counts the number of cycles the speed of the turbocharger exceeds a high predetermined speed for a period of time and then drops below a lower predetermined speed for a period of time;
- is provided with an allowable number of said speed cycles that the turbocharger can experience without low cycle fatigue failure;
compares the counted number of speed cycles to the allowed number of speed cycles; and
provides a signal that will alert an operator that the turbocharger is approaching low cycle fatigue failure. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- is provided with an allowable number of said speed cycles that the turbocharger can experience without low cycle fatigue failure;
Specification