US5719768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock-up clutch control method
Assignee: Denso Corp
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Filing: 1995-12-07
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Granted: 1998-02-17
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Expires: 2015-12-07
Abstract
Abstract A lock-up clutch control method controls a torque converter comprising an input shaft through which a rotating force from an engine is input, an output shaft which outputs a driving force to the side of driving wheels and a lock-up clutch which operates in response to a hydraulic pressure. A control element controls an engaging pressure of the lock-up clutch by way of the hydraulic pressure. The engaging force of the clutch is controlled in accordance with calculated results of a target following up section for calculating a controlled variable so that a slip follows up a target slip and a control system stabilizing section for calculating the controlled variable so that the disturbance applied to the control system is compensated. Thereby, a stable control may be realized without receiving any effect of the disturbance. The disturbance may be estimated and learned for more accurate control.
Inventors
- 👤 Tsutomu Tashiro
- 👤 Yoshifumi Kato
- 👤 Tetsuji Kozaki
- 👤 Masami Fujitsuna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/14; F16H61/143; B; B60; B60W; B60W50/00; B60W2050/0001; B60W2050/0019; B60W2050/0028; B60W2050/0031; F16H2061/0075; F16H2061/0087; F16H2061/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A computer-implemented process for controlling a slip between input and output shafts of a torque converter, said method comprising the steps of: monitoring operating conditions of an engine and a turbine connected thereto to determine said slip; calculating a slip deviation between said slip and a target slip; calculating a time change in said slip; calculating a target follow-up value from said slip deviation; calculating a control system stabilizing value for compensating an effect of a disturbance applied to a control system from said slip and said time change; obtaining a controlled variable for a hydraulic pressure adjusting unit from said target follow-up value and said control system stabilizing value; and controlling said hydraulic pressure adjusting unit, which is operatively coupled to said torque converter, based on said controlled variable to control said slip.
Claim 2
Dependent Claim
134 words
A computer-implemented process for controlling a slip between input and output shafts of a torque converter, said method comprising the steps of: monitoring operating conditions of an engine and a turbine connected thereto to determine said slip; calculating a slip deviation between said slip and a target slip; calculating a time change in said slip; calculating a target follow-up value from said slip deviation; calculating a control system stabilizing value for compensating an effect of a disturbance applied to a control system from said slip and said time change; obtaining a controlled variable for a hydraulic pressure adjusting unit from said target follow-up value and said control system stabilizing value; and controlling said hydraulic pressure adjusting unit, which is operatively coupled to said torque converter, based on said controlled variable to control said slip.
Claim 3
Dependent Claim
127 words
A computer-complemented process for controlling a slip between input and output shafts of a torque converter, said method comprising the steps of: monitoring operating conditions of an engine and a turbine connected thereto to determine said slip; calculating a controlled variable for a hydraulic pressure adjusting unit; estimating, based on said controlled variable and said slip, an error from a predetermined transfer function model as a disturbance applied to an object to be controlled, said transfer function model defining a transfer function from said controlled variable to said slip; and correcting said controlled variable for said hydraulic pressure adjusting unit based on said estimated disturbance value; and controlling a hydraulic regulator operatively coupled to said torque converter based on said corrected controlled variable to control said slip.
Claim 4
Dependent Claim
127 words
A computer-complemented process for controlling a slip between input and output shafts of a torque converter, said method comprising the steps of: monitoring operating conditions of an engine and a turbine connected thereto to determine said slip; calculating a controlled variable for a hydraulic pressure adjusting unit; estimating, based on said controlled variable and said slip, an error from a predetermined transfer function model as a disturbance applied to an object to be controlled, said transfer function model defining a transfer function from said controlled variable to said slip; and correcting said controlled variable for said hydraulic pressure adjusting unit based on said estimated disturbance value; and controlling a hydraulic regulator operatively coupled to said torque converter based on said corrected controlled variable to control said slip.
Claim 5
Dependent Claim
28 words
A method according to claim 2, further comprising the step of: learning repeatedly said estimated disturbance value; and correcting said controlled variable based on said learned estimated value.
Claim 6
Dependent Claim
85 words
A method according to claim 2, wherein said controlled variable calculating step includes the steps of: calculating a slip deviation between said slip and said target slip; calculating a target follow-up amount from said slip deviation; calculating a control system stabilizing value for compensating an effect of said disturbance from said slip and said time change; and obtaining said control variable for actuating a hydraulic pressure adjusting unit operatively coupled to said torque converter from said target follow-up value and said control system stabilizing value.
Claim 7
Dependent Claim
15 words
A lock-up clutch control method according to claim 2, wherein said target slip is filtered.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |