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.

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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
Application number
MX2007012677A
Other languages
Spanish (es)
Inventor
David E Herbert
Ananthakrishnan Surianarayanan
Mark L Dell Eva
Original Assignee
Eaton Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Priority to MX2007012677A priority Critical patent/MX2007012677A/en
Publication of MX2007012677A publication Critical patent/MX2007012677A/en

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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.
MX2007012677A 2007-10-12 2007-10-12 Mode selection and switching logic in a closed-loop pulse width modulation valve-based transmission control system. MX2007012677A (en)

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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