Control of the setting of the ignition and timing
The engine ECU controls the individual ignition coils of the cylinders to obtain an optimum ignition setting at all times in relation to the driving conditions
Diagram of the configuration of the system
"a" motors control relay
"b" battery
"c" air flow meter
"d" intake air temperature sensor
"e" manifold absolute pressure sensor
"f" coolant temperature sensor
"g" inlet camshaft position sensor
"h" exhaust camshaft position sensor
"j" crankshaft angle sensor
"k" accelerator pedal position sensor
"l" knock sensor
"m" IG switch
"n" engine ECU
"p" numbering of the cylinders
"q" spark plug
"r" ignition coil
Starting
The plugs are supplied at the same time in accordance with an ignition setting based on the engine coolant temperature on starting (base setting)
Outside the starting phase
The plugs are supplied at intervals determined by the base ignition setting (based on the quantity of inlet air and the engine speed) to which corrections have been made. the system bases the duration of the supply current on the battery voltage
Ignition setting (outside the starting phase)
"s" crankshaft angle sensor signal
"t" inlet camshaft position sensor signal
"u" exhaust camshaft position sensor signal
"s" crankshaft angle sensor signal
"t" inlet camshaft position sensor signal
"u" exhaust camshaft position sensor signal
"s" crankshaft angle sensor signal
"t" inlet camshaft position sensor signal
"u" exhaust camshaft position sensor signal
"H" = HIGH
"B" = low
| no. No1 cylinder | compression (*) | combustion | exhaust | inlet |
|---|---|---|---|---|
| no. No2 cylinder | inlet | compression (*) | combustion | exhaust |
| no. No3 cylinder | exhaust | inlet | compression (*) | combustion |
| no. No4 cylinder | combustion | exhaust | inlet | compression (*) |
List of the main corrections made to the ignition setting and duration of current controls
| reference: correction | summary |
|---|---|
| correction: temperature of the air inducted | a correction is made in relation to the temperature of the inlet air. the higher the temperature of the inlet air, the greater the ignition retard |
| correction: engine coolant temperature | a correction is made in relation to the temperature of the engine coolant. the lower the temperature of the engine coolant, the greater the ignition advance |
| correction: knock | a correction is made in relation to the engine knocking; the more significant the knocking, the greater the ignition retard |
| correction: stabilisation of the idle | a correction is made in relation to the fluctuations in the idle speed |