Bridgwater College Electronic Ignition - Hall Effect

HALL EFFECT IGNITION Simplified layout of Hall ignition components AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH TRIGGER VANE MAGNET DISTRIBUTOR HALL SENSOR

HALL EFFECT IGNITION Earths to the amplifier and Hall sensor AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH

HALL EFFECT IGNITION Supply from ignition switch to coil AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH

HALL EFFECT IGNITION Wire from the coil negative to the amplifier AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH

HALL EFFECT IGNITION Live supply from ignition to the amplifier AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH

HALL EFFECT IGNITION Ignition switch to the ‘+’ terminal of Hall sensor AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH

HALL EFFECT IGNITION Wire for Hall sensor to amplifier AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH PLEASE STOP

HALL EFFECT IGNITION Diagram 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 ignition switch to the coil and down to the module. The current will flow through R1 and to the base of T1 switching it on. The ignition coil will have an earth allowing it to build up it’s magnetic field (START OF DWELL).

HALL EFFECT IGNITION AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH When Switch 1 is closed the electricity to the amplifier will now flow flow through SW1 to earth thus removing the base to the transistor. The ignition coil will now turn off and and the magnetic field will collapse producing HT. SW1 PLEASE STOP

HALL EFFECT IGNITION Ignition switched on. Stage 1 coil building up AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH ON

HALL EFFECT IGNITION Ignition switched on. Stage 3 Amplifier off AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH HT PLEASE STOP OFF

HALL EFFECT IGNITION 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 voltage Silicon chip Current flow Magnet VM

HALL EFFECT IGNITION 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 voltage Silicon chip Current flow Magnet VM PLEASE STOP

HALL EFFECT IGNITION 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 vane Trigger vane segment

HALL EFFECT IGNITION The trigger vane is fitted into the distributor below the rotor arm. Trigger vane Trigger vane segment PLEASE STOP

HALL EFFECT IGNITION 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 Trigger vane Permanent magnet Hall sensor element Sensor wires

HALL EFFECT IGNITION The module acts as an ON/OFF switch which triggers the main amplifier. Hall sensor components Trigger vane Permanent magnet Sensor element Sensor wires

HALL EFFECT IGNITION 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

HALL EFFECT IGNITION 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 Vane interrupts magnetic field Sensor switch is off

HALL EFFECT IGNITION No interruption - magnetic field passes through sensor Sensor switched on Magnetic 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.

HALL EFFECT IGNITION No interruption - magnetic field passes through sensor Sensor switched on Magnetic 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

HALL EFFECT IGNITION The switch inside the distributor is transistor. AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH + Hall switch Transistor powered by hall chip. OFF MAGNET VANE PLEASE STOP

HALL EFFECT IGNITION The switch inside the distributor is transistor. AMPLIFIER R1 T1 IGNITION COIL BATTERY IGNITION SWITCH + Hall switch Transistor powered by hall chip. ON MAGNET PLEASE STOP

HALL EFFECT IGNITION SYSTEM COMPONENTS AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION LIVE SUPPLY TO AMPLIFIER AND COIL AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION EARTH WIRE TO AMPLIFIER AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION WIRE FROM COIL TO AMPLIFIER AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION WIRE FROM AMPLIFIER TO ‘+’ ON ‘DIST’ AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION WIRE FROM AMPLIFIER TO ‘-’ ON ‘DIST’ AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION WIRE FROM AMPLIFIER TO ‘0’ ON ‘DIST’ AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

HALL EFFECT IGNITION Red indictates the current flow through the wires AMPLIFIER COIL BATTERY ING SW DISTRIBUTOR

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