Patent US5530647A successfully refreshed from Google Patents.
US5530647A
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Method of dynamically determining oil change intervals for internal combustion engines
Assignee: Thermo King Corp
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Filing: 1994-07-25
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Granted: 1996-06-25
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Expires: 2014-07-25
Abstract
Abstract A method of dynamically determining engine oil change intervals for an internal combustion engine having selectable high and low operating speeds HS and LS, respectively. The method includes the steps of accumulating operating time THS of the internal combustion engine at speed HS, accumulating operating time TLS of the internal combustion engine at speed LS, calculating a high speed factor HSF as a function of the accumulated engine operating time THS, and calculating a low speed factor LSF as a function of the accumulated engine operating time TLS. The method then sums the high speed and slow speed factors HSF and LSF to provide a sum S which is compared with a predetermined constant K1. A signal indicating the engine oil should be changed is provided when the comparison step finds the sum S has reached the predetermined constant K1. In a preferred embodiment, the method also includes the step of detecting when the engine oil of the internal combustion engine has been changed, and the step of resetting the accumulated high and low speed operating times THS and TLS, respectively, when the detecting step detects that the engine oil has been changed.
Inventors
- 👤 Thomas R. Sem
- 👤 Jay L. Hanson
- 👤 Doyle G. Herrig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:33
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/10; G; G07; G07C; G07C5/00; G07C5/006; F01M2011/14; F01M2011/1486; F16; F16N; F16N2230/00; F16N2230/02; F16N2260/00; F16N2260/02; F16N2260/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
207 words
A method of dynamically determining engine oil change intervals for an internal combustion engine having selectable high and low operating speeds HS and LS, respectively, comprising the steps of: accumulating operating time THS of the internal combustion engine at speed HS, accumulating operating time TLS of the internal combustion engine at speed LS, calculating a high speed factor HSF as a function of the accumulated engine operating time THS, calculating a low speed factor LSF as a function of the accumulated engine operating time TLS, detecting when the engine oil of the internal combustion engine has been changed, including the steps of sequentially detecting (i) a drop in engine oil level below a predetermined level and (ii) an increase in engine oil level above a predetermined level, resetting the accumulated high and low speed operating times THS and TLS, respectively, when the detecting step detects that the engine oil has been changed, summing the high speed and low speed factors HSF and LSF to provide a sum S, providing a predetermined constant K1, comparing the sum S with the predetermined constant K1, and providing a signal indicating the engine oil should be changed when the comparison step finds the sum S has reached the predetermined constant K1.
Claim 2
Independent Claim
207 words
A method of dynamically determining engine oil change intervals for an internal combustion engine having selectable high and low operating speeds HS and LS, respectively, comprising the steps of: accumulating operating time THS of the internal combustion engine at speed HS, accumulating operating time TLS of the internal combustion engine at speed LS, calculating a high speed factor HSF as a function of the accumulated engine operating time THS, calculating a low speed factor LSF as a function of the accumulated engine operating time TLS, detecting when the engine oil of the internal combustion engine has been changed, including the steps of sequentially detecting (i) a drop in engine oil level below a predetermined level and (ii) an increase in engine oil level above a predetermined level, resetting the accumulated high and low speed operating times THS and TLS, respectively, when the detecting step detects that the engine oil has been changed, summing the high speed and low speed factors HSF and LSF to provide a sum S, providing a predetermined constant K1, comparing the sum S with the predetermined constant K1, and providing a signal indicating the engine oil should be changed when the comparison step finds the sum S has reached the predetermined constant K1.
Claim 3
Dependent Claim
83 words
The method of claim 1 wherein the step of calculating the high speed factor HSF includes the steps of providing a predetermined constant K2 having a value greater than unity, and multiplying the accumulated high speed operating time THS with the predetermined constant K2, and the step of calculating the low speed factor LSF includes the steps of providing a predetermined constant K3 having a value less than unity, and multiplying the accumulated low speed operating time TLS with the predetermined constant K3.
Claim 4
Dependent Claim
97 words
The method of claim 1 wherein the step of calculating the high speed factor HSF includes the steps of providing a predetermined constant K2, and multiplying the accumulated high speed operating time THS with the predetermined constant K2, and the step of calculating the low speed factor LSF includes the steps of providing a predetermined constant K3, and multiplying the accumulated low speed operating time TLS with the predetermined constant K3, with the values of the constants K2 and K3 being selected such that the value of constant K2 is about twice the value of constant K3.
Claim 5
Dependent Claim
62 words
The method of claim 1 wherein the step of calculating the high speed factor HSF multiplies the accumulated high speed operating time THS with predetermined constant K2 having a value of about 1.67, and the step of calculating the low speed factor LSF multiplies the accumulated low speed operating time TLS with a predetermined constant K3 having a value of about 0.83.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein the value of the predetermined constant K1 is the oil change interval in hours using first and second predetermined percentages of high speed and low speed operating time, respectively.
Claim 7
Dependent Claim
34 words
The method of claim 5 wherein the predetermined percentages of high speed and low speed operating time are about 20% and 80%, respectively, and the value of the predetermined constant K1 is about 1500.
Claim 8
Independent Claim
222 words
A method of dynamically determining engine oil change intervals for an internal combustion engine having selectable high and low operating speeds HS and LS, respectively, comprising the steps of: accumulating operating time THS of the internal combustion engine at speed HS, accumulating operating time TLS of the internal combustion engine at speed LS, calculating a high speed factor HSF as a function of the accumulated engine operating time THS, calculating a low speed factor LSF as a function of the accumulated engine operating time TLS, detecting when the engine oil of the internal combustion engine has been changed during an engine off cycle, including the steps of sequentially detecting (i) a drop in engine oil level below a predetermined level which persists for at least a predetermined period of time and (ii) an increase in engine oil level above a predetermined level, resetting the accumulated high and low speed operating times THS and TLS, respectively, when the detecting step detects that the engine oil has been changed, summing the high speed and low speed factors HSF and LSF to provide a sum S, providing a predetermined constant K1, comparing the sum S with the predetermined constant K1, and providing a signal indicating the engine oil should be changed when the comparison step finds the sum S has reached the predetermined constant K1.
Claim 9
Independent Claim
222 words
A method of dynamically determining engine oil change intervals for an internal combustion engine having selectable high and low operating speeds HS and LS, respectively, comprising the steps of: accumulating operating time THS of the internal combustion engine at speed HS, accumulating operating time TLS of the internal combustion engine at speed LS, calculating a high speed factor HSF as a function of the accumulated engine operating time THS, calculating a low speed factor LSF as a function of the accumulated engine operating time TLS, detecting when the engine oil of the internal combustion engine has been changed during an engine off cycle, including the steps of sequentially detecting (i) a drop in engine oil level below a predetermined level which persists for at least a predetermined period of time and (ii) an increase in engine oil level above a predetermined level, resetting the accumulated high and low speed operating times THS and TLS, respectively, when the detecting step detects that the engine oil has been changed, summing the high speed and low speed factors HSF and LSF to provide a sum S, providing a predetermined constant K1, comparing the sum S with the predetermined constant K1, and providing a signal indicating the engine oil should be changed when the comparison step finds the sum S has reached the predetermined constant K1.
Claim 10
Dependent Claim
83 words
The method of claim 7 wherein the step of calculating the high speed factor HSF includes the steps of providing a predetermined constant K2 having a value greater than unity, and multiplying the accumulated high speed operating time THS with the predetermined constant K2, and the step of calculating the low speed factor LSF includes the steps of providing a predetermined constant K3 having a value less than unity, and multiplying the accumulated low speed operating time TLS with the predetermined constant K3.
Claim 11
Dependent Claim
97 words
The method of claim 7 wherein the step of calculating the high speed factor HSF includes the steps of providing a predetermined constant K2, and multiplying the accumulated high speed operating time THS with the predetermined constant K2, and the step of calculating the low speed factor LSF includes the steps of providing a predetermined constant K3, and multiplying the accumulated low speed operating time TLS with the predetermined constant K3, with the values of the constants K2 and K3 being selected such that the value of constant K2 is about twice the value of constant K3.
Claim 12
Dependent Claim
62 words
The method of claim 7 wherein the step of calculating the high speed factor HSF multiplies the accumulated high speed operating time THS with predetermined constant K2 having a value of about 1.67, and the step of calculating the low speed factor LSF multiplies the accumulated low speed operating time TLS with a predetermined constant K3 having a value of about 0.83.
Claim 13
Dependent Claim
35 words
The method of claim 7 wherein the value of the predetermined constant K1 is the oil change interval in hours using first and second predetermined percentages of high speed and low speed operating time, respectively.
Claim 14
Dependent Claim
34 words
The method of claim 11 wherein the predetermined percentages of high speed and low speed operating time are about 20% and 80%, respectively, and the value of the predetermined constant K1 is about 1500.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-06-25 | 1999-12-25 | 2000-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-25 | 2003-12-25 | 2004-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-25 | 2007-12-25 | 2008-06-25 | $7700.00 | Window Closed / Lapsed |