Ignition Key

Ignition Key


Ignition key is used to start the car, quite obviously :)

 Ignition key is used in vehicles to turn the ignition switch that connects the battery to the ignition system and other electrical devices.





There are different types or designs of ignition keys, which can perform multiple functions other than just using for starting the engine.



                                                              Tesla's car shaped key



 

 

Ignition Switch


Ignition switch is the place where ignition key is inserted to start the vehicle.
But, it has more functions than simply starting the vehicle.
A basic ignition has 4 positions.
  • Lock
  • Accessory
  • ON
  • Start

 

 

Lock

Ignition key can be removed only from Lock position.
This is to prevent the steering getting locked if the driver switches off the engine while vehicle is running (like in downhills, or accidental turning off the key)

 At this position,
  • All the engine electrical connections are disabled.
  • Steering lock is enabled.
  • If vehicle is fitted with Immobilizer or any anti-theft system, these will be active even at Lock position.
  • Indicators / park light can be turned on.
  • Some manufacturers allow entertainment systems to be switched on at Lock position also.
 

Accessory

This position allows vehicle electrical accessories such as blower fan, headlight, power window, sun-roof,  to be On. This is mainly for passenger convenience. But prolonged use of any of these will drain the battery.

Sophisticated vehicles have battery monitoring systems, which will turn-off accessories automatically if the battery voltage goes below energy required for starter motor to start the vehicle.

ON

When the switch is turned to the "On" position all lamps on the instrument panel will illuminate.
This is called lamp self-test, just to test the operation of the lamps, whether working correctly or not.


Start

The "Start" position activates the starter motor, which enables the engine to crank and start the engine.


Immobilizer

Remote/passive entry system


starter relay control
starter motor

fly wheel
clutch
clutch switch

acc pedal
throttle position sensor
stepper motor for throttle control
vehicle speed sensor

brake - disc/drum/engine brake

engine -
map sensor
maf sensor
crankshaft position sensor
hall effect sensor
stepper motor for idle speed control
coolant temperature sensor

transmission types
AT/MT/AMT/CVT
gear position sensor

exhaust -
lambda sensor
knock sensor

ignition coil
spark plug
injectors
fuel pump

cruise control

start-stop system
driver/ passenger door switches
hood switch
battery sensors

CAN
UDS

wiper motor
parking sensors

* All image sources - Google.com




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