bridgwater college electronic ignition - hall effect

Bridgwater College

Electronic Ignition - Hall Effect

HALL EFFECT IGNITION

Simplified layout of Hall ignition componentsSimplified layout of Hall ignition components

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

TRIGGER VANE

MAGNET

DISTRIBUTOR

HALL SENSOR


Earths to the amplifier and Hall sensorEarths to the amplifier and Hall sensor

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH


Supply from ignition switch to coilSupply from ignition switch to coil

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH


Wire from the coil negative to the amplifierWire from the coil negative to the amplifier

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH


Live supply from ignition to the amplifierLive supply from ignition to the amplifier

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH


Ignition switch to the ‘+’ terminal of Hall sensorIgnition switch to the ‘+’ terminal of Hall sensor

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH


Wire for Hall sensor to amplifierWire for Hall sensor to amplifier

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

PLEASE STOP


Diagram shows operation of ignition simplifiedDiagram shows operation of ignition simplified

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

SW 1

When switch 1 is open the current will flow from the ignitionswitch to the coil and down to the module. The current willflow through R1 and to the base of T1 switching it on. Theignition coil will have an earth allowing it to build up it’smagnetic field (START OF DWELL).


AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

When Switch 1 is closed the electricity to the amplifier will now flowflow through SW1 to earth thus removing the base to the transistor.The ignition coil will now turn off and and the magnetic field willcollapse producing HT.

SW1

PLEASE STOP


Ignition switched on. Stage 1 coil building upIgnition switched on. Stage 1 coil building up

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

ON


Ignition switched on. Stage 3 Amplifier offIgnition switched on. Stage 3 Amplifier off

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

HT

PLEASE STOP

OFF


The heart of the Hall switch is a silicon chip. If electricity is passed through the chip and the chip is in a magnetic field a voltage is generated across the chip at 90 degrees to the current flow.

The heart of the Hall switch is a silicon chip. If electricity is passed through the chip and the chip is in a magnetic field a voltage is generated across the chip at 90 degrees to the current flow.

Hall effect voltageHall effect voltage

Silicon chip

Current flowMagnet

VM


Observe the diagram.

When the magnetic field is applied to the chip the volmeter is now reading the generated voltage.

Observe the diagram.

When the magnetic field is applied to the chip the volmeter is now reading the generated voltage.

Hall effect voltageHall effect voltage

Silicon chip

Current flowMagnet

VM

PLEASE STOP


The trigger vane contains a number of segments, the number of segments is identical to the number of engine cylinders. The trigger vane is made of soft iron.

The trigger vane contains a number of segments, the number of segments is identical to the number of engine cylinders. The trigger vane is made of soft iron.

Trigger vaneTrigger vane

Trigger vane segment


The trigger vane is fitted into the distributor below the rotor arm.

The trigger vane is fitted into the distributor below the rotor arm.

Trigger vaneTrigger vane

Trigger vane segment

PLEASE STOP


The system employs a passive or stationary magnet and Hall (vane) switch or sensor fitted in a limb of a ‘U’ shaped module.

Hall sensor components Hall sensor components

Trigger vane

Permanentmagnet

Hall sensor element

Sensor wires


The module acts as an ON/OFF switch which triggers the main amplifier.

The module acts as an ON/OFF switch which triggers the main amplifier.

Hall sensor components Hall sensor components

Trigger vane

Permanentmagnet

Sensor element

Sensor wires


OPERATION

When the solid part of the vane moves into the ‘U’ shaped gap, the hall sensor switch is turned off, thus allowing a positive supply to the amplifier.

OPERATION

When the solid part of the vane moves into the ‘U’ shaped gap, the hall sensor switch is turned off, thus allowing a positive supply to the amplifier.

Vane interrupts magnetic field


----------

----------

Sensor switch is off


The ampilfier will be switched on, thus giving the ignition coil an earth, the coil will then build up it’s magnetic field.

The width of each vane determines the dwell angle for constant dwell type amplifiers

The ampilfier will be switched on, thus giving the ignition coil an earth, the coil will then build up it’s magnetic field.

The width of each vane determines the dwell angle for constant dwell type amplifiers



----------

----------

Sensor switch is off


No interruption - magnetic field passes through sensor


Sensor switched onMagnetic field

As the vane moves out of the ‘U’ shaped gap a magnetic field will then be passed through the Hall sensor causing it to be switched on. This will now remove the positive supply to the amplifier.

As the vane moves out of the ‘U’ shaped gap a magnetic field will then be passed through the Hall sensor causing it to be switched on. This will now remove the positive supply to the amplifier.




Sensor switched onMagnetic field

The amplifier will now be turned off, thus removing the ignition coil earth.

The magnetic field inside the coil will collapse providing HT to the spark plugs.

The amplifier will now be turned off, thus removing the ignition coil earth.

The magnetic field inside the coil will collapse providing HT to the spark plugs.PLEASE STOP


The switch inside the distributor is transistor.The switch inside the distributor is transistor.

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

+

Hall switch

Transistor poweredby hall chip.

OFFMAGNET

VANE PLEASE STOP


The switch inside the distributor is transistor.The switch inside the distributor is transistor.

AMPLIFIER

R1

T1

IGNITION COIL

BATTERY

IGNITION SWITCH

+

Hall switch

Transistor poweredby hall chip.

ONMAGNET

PLEASE STOP


SYSTEM COMPONENTS

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


LIVE SUPPLY TO AMPLIFIER AND COIL

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


EARTH WIRE TO AMPLIFIER

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


WIRE FROM COIL TO AMPLIFIER

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


WIRE FROM AMPLIFIER TO ‘+’ ON ‘DIST’

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


WIRE FROM AMPLIFIER TO ‘-’ ON ‘DIST’

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


WIRE FROM AMPLIFIER TO ‘0’ ON ‘DIST’

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


Red indictates the current flow through the wires

7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V1


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V2


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V3


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V4


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V5


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V6


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V7


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V8


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V9


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V10


7 6 5 4 3 2 1

+0

15 1

AMPLIFIER

COIL

BATTERYING SW

DISTRIBUTOR

V11

bridgwater college electronic ignition - hall effect

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