US 2008/0185254 A1 · FLUID MODEL CONTROL OF ELECTRO-VISCOUS FAN CLUTCH

Abstract

Accordingly, a control system for controlling a viscous clutch of a fan is provided. The control system includes a delta speed module that determines one of an over speed condition, an under speed condition, and a steady state condition based on a desired fan speed and an actual fan speed. A mode module determines a mode of the clutch based on the one of the over-speed condition, the under-speed condition, and the steady state condition, wherein the mode is one of a pump in mode, a pump out mode, and a closed loop mode. A valve control module that controls an operational state of the clutch valve based on the mode.

Claims21

Dependent claims

A control system for controlling a clutch valve of a viscous clutch fan system comprising:

a delta speed module that determines one of an over speed condition, an under speed condition, and a steady state condition based on a desired fan speed and an actual fan speed;
a mode module that determines a mode of the clutch based on the one of the over-speed condition, the under-speed condition, and the steady state condition, wherein the mode is one of a pump in mode, a pump out mode, and a closed loop mode;
and
a valve control module that controls an operational state of the clutch valve based on the mode.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

11/671,928Filed 6 Feb 2007

Published

7 Aug 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

F16D 48/066
Control by electric or electronic means, e.g. of fluid pressure: control of fluid pressure, e.g. using an accumulator
F16D 2500/1026
Actuator: hydraulic
F16D 2500/10418
Clutch position: accessory clutch, e.g. cooling fan, air conditioning
F16D 2500/10468
Clutch type: fluid adhesion clutch

Fluid model control of electro-viscous fan clutch

Life of this patent

Fluid model control of electro-viscous fan clutch

Life of this patent

Abstract

Claims21