Raider V6-3.7L SOHC (2006)
The strength of the magnetic field is the primary force that determines the speed of operation in a particular solenoid design. A stronger magnetic field
will cause the plunger to move at a greater speed than a weaker one. There are basically two ways to increase the force of the magnetic field:
1. Increase the amount of current applied to the coil
or
2. Increase the number of turns of wire in the coil. The most common practice is to increase the number of turns by using thin wire that can
completely fill the available space within the solenoid housing. The strength of the spring and the length of the plunger also contribute to the
response speed possible by a particular solenoid design.
A solenoid can also be described by the method by which it is controlled. Some of the possibilities include variable force, pulse-width modulated,
constant ON, or duty cycle. The variable force and pulse-width modulated versions utilize similar methods to control the current flow through the
solenoid to position the solenoid plunger at a desired position somewhere between full ON and full OFF. The constant ON and duty cycled
versions control the voltage across the solenoid to allow either full flow or no flow through the solenoid's valve.
OPERATION
When an electrical current is applied to the solenoid coil, a magnetic field is created which produces an attraction to the plunger, causing the plunger
to move and work against the spring pressure and the load applied by the fluid the valve is controlling. The plunger is normally directly attached to the
valve which it is to operate. When the current is removed from the coil, the attraction is removed and the plunger will return to its original position due
to spring pressure.
The plunger is made of a conductive material and accomplishes this movement by providing a path for the magnetic field to flow. By keeping the air
gap between the plunger and the coil to the minimum necessary to allow free movement of the plunger, the magnetic field is maximized.
Assembly - Transmission Solenoid/Pressure Switch
ASSEMBLY - TRANSMISSION SOLENOID/PRESSURE SWITCH
DESCRIPTION
