Chery A11 2003 Repair Manual page 649

4. Ignition system
Ignition system is a grouped electronic control ignition system (1—4 cylinders in one
group, 2—3 cylinders in the other group). The ignition system is integrated with fuel
injection system, which is an electronic system with a built-in power supply module, and
canprovide with all kinds of optimal ignition value Upon input instaneous physical
parameters related with engine operating condition, all kinds of optimal ignition values can
be wrote into program via a managing circuit.
ECU controls 2 primary coils on and off. Secondary coil will generate a high voltage
due to secondary induction when primary coil current is suddenly cut off, and 1-4 cylinder
and 2-3 cylinder spark plugs connected to secondary coil final terminal via ignition wire
will obtain high voltage and therefore firing is achieved.
Basic ignition advance angle is regulated and determined upon engine coolant
temperature and air temperature. Under most conditions, ECU dynamically compensate
basic ignition advance angle upon engine rotational speed and air intake manifold absolute
pressure to obtain optimum ignition advance angle. Under a very low engine idle speed
condition, ignition advance angle keep constant.
(2) Static state high voltage output ignition coil
Fig 10 Ignition Coil Schematic
1. Cylinder-1 ignition terminal
ignition terminal
The system uses a closed magnetic circuit coil packed in a plastic container with a coat
of epoxy outside, which has special ability of non-electric conduct, mechanicalness, thermal
characteristic and high temperature resistance. The part of primary coil near iron core
lessens the flow of magnetic current causing secondary coupling can reach maximum and
has the following capabilities:
- High ignition voltage storage;
-High energy transmission performance of secondary coil;
-Long ignition duration;
- Rapid secondary voltage increasing
(3) Knock sensor
High temperature, mechanical parts aging and wearing, low octane gasoline etc may be
possible knock causes. Since knock may damage engine, to prevent continuous knock,,
2. cylinder-2 ignition terminal 3. cylinder-3