fluid logic control systems presentation .ppt

fluid logic control systems

1. FLUID LOGIC CONTROL
SYSTEMS
By:
Mohammed AL-akhali
Mechatronics Engineering

2. INTRODUCTION
Fluid logic control systems use logic devices that switch a fluid,
usually air, from one outlet of the device to another outlet.The
output of a fluid logic device is either ON or OFF as it is rapidly
switched from one state to the other by the application of a
control signal.
Devices that use a fluid for control logic purposes are broadly
classified as either moving-part logic (MPL) devices or fluidic
devices.

3. Moving-Part Logic
Moving-Part logic are miniature valve-type devices, which—by
the action of internal moving parts-perform switching operations
in fluid logic control circuits.
MPL are typically available as spool, poppet, and diaphragm
valves, which can be actuated by means of mechanical
displacement, electric voltage, or fluid pressure.
Moving-part logic circuits provide a variety of logic control
functions for controlling the operation of fluid power systems.

4. INTRODUCTION
Moving-part logic circuits use four major logic control functions:
I.AND Function
II.OR Function
III.NOT Function
IV.MEMORY Function

5. AND Function
AND function,requires two
control signals must exist in
order to obtain an

6. OR Function
An OR circuit is one in
which a control signal at
any one valve will
produce an output. Thus,
all control signals must be
off in order for the output
not to exist.

7. NOT Function
In a NOT function, the output is ON only when the single input control
signal A is OFF, and vice versa.

8. MEMORY Function
MEMORY is the ability of a control system to retain information as to
where a signal it has received originated. MEMORY circuit, which
operates as follows: If control signal A is momentarily applied, output C
will come on. Conversely, if control signal B is momentarily applied, the
output will exist at D

9. INTRODUCTION

10. THANK YOU……
.

11. Fluidic Devices
Fluidic devices use a completely different technique for
providing control logic capability as compared to MPL devices.
Fluidics is the technology that uses fluid flow phenomena in
components and circuits to perform a variety of control
functions such as sensing, logic, memory, and timing. The
concepts of fluidics are basically simple. They involve the effect
of one fluid stream meeting another to change its direction of
flow and the effect of a fluid stream sticking to a wall.

12. Fluidic Devices
Since fluidic components have no moving parts, they virtually
do not wear out.
However, component malfunction can occur due to clogging of
critical flow passageways if contaminants in the air supply are
not eliminated by proper filtration.