PEC synchronizing fuel injection and firing order function

S07.52-3019-06

Task

 Determining (synchronizing) the fuel injection and firing order of the fuel injectors (Y16 - Y19) and the ignition coils (R9, R39) when the engine is started

Features

– The fuel injectors are combined into 2 groups (Y16+Y19 and Y17+Y18) in respect of actuation and are actuated twice by the PEC control module (A13) during each cycle (720° crank angle).

– The ignition coils (R9, R39) supply ignition voltage to 2 spark plugs each (E83+E86, E84+E85) and are actuated twice by the PEC control module (A13) during each cycle (720° crank angle).

A13 PEC control module

B73 Crankshaft position sensor

E83-E86 Spark plugs

R9 Ignition coil 1 (cylinders 1+4)

R39 Ignition coil 2 (cylinders 2+3)

Y16-Y19 Fuel injectors

S07.52-3028-06

Function

The PEC control module (A13) analyzes the signal (a) supplied by the crankshaft position sensor (B73) and detects cylinders 1+4 and 2+3 on the basis of the signal pattern and combines the injectors (Y16 - Y19) into groups for actuation. The segment of the driven plate/flywheel (b) with permanent magnet (e) are used for detecting cylinders 2+3.

a Signal of crankshaft position sensor

b Segments of driven plate/flywheel

c Front edge of segment

d Rear edge of segment

e Permanent magnet

f Ignition TDC of cylinder 1

S07.52-3029-06

Fuel injection/ignition chart

Induction

Compression

Power

Exhaust

Ignition spark (compr. stroke)

Ignition spark (exhaust stroke)

Injection (1st part quantity)

Injection (2nd part quantity)