MX2007012677A - Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system. - Google Patents
Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system.Info
- Publication number
- MX2007012677A MX2007012677A MX2007012677A MX2007012677A MX2007012677A MX 2007012677 A MX2007012677 A MX 2007012677A MX 2007012677 A MX2007012677 A MX 2007012677A MX 2007012677 A MX2007012677 A MX 2007012677A MX 2007012677 A MX2007012677 A MX 2007012677A
- Authority
- MX
- Mexico
- Prior art keywords
- pressure
- control system
- control
- feedback signal
- pulse width
- Prior art date
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- Control Of Transmission Device (AREA)
Abstract
A pulse width modulated (PWM) valve-based hydraulic control system is disclosed. In one embodiment, a feedback control system includes a controller that receives a pressure command signal and a pressure feedback signal. The controller generates a duty cycle control signal that controls a PWM valve. The PWM valve provides a control pressure Pc to control a load, such as an actuator of an automatic transmission system. A pressure sensor measures the control pressure Pc and provides the pressure feedback signal. In another embodiment, a compensator provides compensation for linear and nonlinear effects in the pressure feedback signal, based at least in part, on other inputs, such as fluid temperature. In other embodiments, a plurality of controllers are provided, and a controller is selected by a switching logic processor, or by phase-in and phase-out filters, based on the pressure feedback signal and other inputs. A re-calibration process for the Pc versus duty cycle response of the PWM valve is also disclosed. The re-calibration method updates the feedback control system processes to maintain performance despite variations due to wear, temperature, and other factors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2007012677A MX2007012677A (en) | 2007-10-12 | 2007-10-12 | Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2007012677A MX2007012677A (en) | 2007-10-12 | 2007-10-12 | Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system. |
Publications (1)
Publication Number | Publication Date |
---|---|
MX2007012677A true MX2007012677A (en) | 2009-04-13 |
Family
ID=41559248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MX2007012677A MX2007012677A (en) | 2007-10-12 | 2007-10-12 | Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system. |
Country Status (1)
Country | Link |
---|---|
MX (1) | MX2007012677A (en) |
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2007
- 2007-10-12 MX MX2007012677A patent/MX2007012677A/en active IP Right Grant
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