actuators and optical speed sensor and application in automatic transmission
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ACTUATORSAND OPTICAL SPEED SENSOR
AND APPLICATION IN AUTOMATIC TRANSMISSION
By guided bySARATH.P.R U.PRAKASH12402052U7
INTRODUCTIONAn actuator is a kind of motor that controls or moves
mechanisms or systems.
Actuators are extremely useful devices and have diverse range of uses in engineering.
It is operated from a source of energy usually from electric current ,hydraulic fluid pressure , pneumatic pressure.
An actuator is a mechanism by which a control system acts on environment
The control system can be an electronic system , software based..
Type of medium
Hydraulic pneumatic
electrical
ACTUATORS
HYDRAULIC ACTUATORS
PRINCIPLEPascal’s Law
“Pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid, acts upon every part of the confining vessel at right angles to its interior surfaces”.
F = P x A
Hydraulic refers to means and mechanisms of transfer of power through liquids.
Hydraulic systems convert mechanical power to fluid power , transmit the fluid power to some location , convert back this fluid power to mechanical power to do useful work.
Hydraulic systems are used when large force are required.
PARTS
CYLINDER AND PISTON
DIRECTION CONTROL VALVE
PUMP
PRESSURE RELIEF VALVE
WORKING OF HYDRAULIC ACTUATION SYSTEMΑ directional control valve controls the direction of oil flow in the system
and, therefore, the direction of motion of the cylinder piston.The valve has four ports, labeled Ρ, Τ, Α, and Β. Ρ and Τ stand for
pressure and tank (or reservoir), and Α and Β are output ports. The valve can be operated in three different positions.
Case 1: Lever is moved away from valve body
case 2 Lever is moving towards valve body
• The oil from the pump flows through path Ρ-Α of the valve to the upper end of the cylinder.
• The oil pushes the piston downward, which lowers the attached load. At the same time, the oil at the lower end of the cylinder flows back to the reservoir through path Β-Τ of the directional control valve.
case 3 : Lever is idle in position
• When the directional control valve lever is released, the valve automatically returns
to the center (neutral) position.
•In this position, all four ports are blocked and oil cannot escape from either side of
the cylinder.
•. This stops the movement of the piston and causes oil to flow from the pump back
to the reservoir through the pressure relief valve.
ADVANTAGES and DISADVANTAGESActuation of large control surface with minimal input.Variable speed and direction.overload protection.Greater load carrying capacity.Leakage may occurHigh fire riskTemperature changes alters the viscosity of the fluid.
PNEUMATIC ACTUATOR
A pneumatic actuator converts energy (typically in the form
of compressed Air) into motion. The motion can be rotary or linear,
depending on the type of actuator.
A Pneumatic actuator mainly consists of a piston, a cylinder, and valves or
ports.
Pneumatic systems are very common, and have much in common with
hydraulic systems with a few key differences
WORKING OF PNUEMATIC ACTUATORS
ADVANTAGES AND DISADVANTAGES Infinite availability of source
Safe and clean
Negligible maintenance
Low cost
Easy to leak
Potential noises
ELECTRIC MOTORS
•The physical principle of all
electric motors is that when an
electric current is passed through
a conductor (usually a coil of
wire) placed within a magnetic
field, a force is exerted on the
wire causing it to move.
COMPONENTS OF AN ELECTRIC MOTORThe principle components of an electric motor are:
• STATOR
• ROTOR
• COMMUTATOR
• BRUSHES
DC MOTORThe classic DC motor has a rotating armature in the form of an
electromagnetA rotary switch called a commutator reverses the direction of
the electric current twice every cycle, to flow through the armature so that the poles of the electromagnet push and pull against the permanent magnets on the outside of the motor
As the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet.
During that instant of switching polarity, inertia keeps the motor going in the proper direction
WORKING
PM
BRUSH
ARMATURE
COMMUTATOR
STEPPER MOTORWhat is a stepper motor?
1. Motor that moves one step at a time
2. Brushless motor
3. each step is defined by a step angle
4. Rotation of the angle is proportional to the input impulse
2
1
S
N
1
2
Outside Casing
Stator
Rotor
Internal components of a Stepper Motor
OPTICAL SPEED SENSORS
• First appeared in general motor vehicles
• It uses photocell , light emitting diode(LED) and two blade mirrored reflector to generate electrical signal
• More fast and accurate
• Located inside the speedometer head at the back of the control panel
When the vehicle is in motion the speedometer cable spins the two blade reflector
Each time the reflector rotates through the LED beam , the light is reflected to the photocell
This generates an electric signal and also electric pulses
the computer is programmed to convert the pulses to the electronic measurement of vehicle speed
OPTICAL SPEED SENSOR
Application in automatic transmissionSince the optical speed sensors are fast and accurate ,they
have wide application in automatic transmission.
Using the data from the optical speed sensors the ,the gear can be shift automatically at the desired speed.
Thus the vehicle can be operated at optimal efficiency without much skill of driver.
For the torque converter clutch operation speed sensor data is necessary.
Conclusion
Actuators have wide application in our daily life
Hydraulic ,electric and pneumatic actuators are used I almost all automobiles.
Optical speed sensors are necessary for automatic transmission.
referenceErylmaz B, Wilson BH (2000). Combining
leakage and orifice flows in a hydraulic servo valve model. J. Dynamic Systems Measurement Control, 122: 576-579
THANK YOU
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