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Ignition system ignition coil 12131748017 12131703228 for BMW 3 Series
Products name | Ignition system ignition coil |
OE NO. | 12131748017 12131703228 |
Car make | for BMW 3 Series |
Other reference number | 12131748018 12137599219 |
Weight | 0.25KG |
Packing | Neutral packing |
Warranty | 12 months |
Shipping way | by express or sea shipping |
Three types of ignition coils
Digital Electronically Controlled Ignition System (ESA) is divided into two types: distributor type and non-distributor type (DLI) according to the structure. The distributor-type electronically controlled ignition system uses only one ignition coil to generate high-voltage electricity, and then the distributor follows the ignition sequence
is ignited by the spark plugs of each cylinder in turn. Since the on-off work of the primary coil of the ignition coil is undertaken by the electronic ignition circuit, the distributor has cancelled the breaker device and only plays the role of high-voltage power distribution.
two-cylinder ignition method
Dual-cylinder ignition method refers to the combination of two
cylinders with an ignition coil, so this ignition method can only
be used on engines with an even number of cylinders. If on a
4-cylinder engine, when two cylinder pistons approach top dead
center at the same time (one is for compression and the other is
for exhaust), the two spark plugs share the same ignition coil and
ignite at the same time. At this time, one is effective and the
other is Ineffective ignition, the former is in the high-pressure
and low-temperature mixture, and the latter is in the low-pressure
and high-temperature exhaust gas. Therefore, the resistance between
the spark plug electrodes of the two is completely different, and
the energy generated is different, resulting in a much larger
effective ignition energy. , Accounting for about 80% of the total
energy.
Single ignition method
Single ignition method is to allocate an ignition coil to each
cylinder, and the ignition coil is directly installed on the top of
the spark plug, which also eliminates the high voltage line. This
ignition method achieves precise ignition by camshaft sensors or by
monitoring cylinder compression. It is suitable for engines with
any number of cylinders, and is especially suitable for engines
with 4 valves per cylinder. Because the spark plug ignition coil
assembly can be installed in the middle of the double overhead
camshaft (DOHC), the gap space is fully utilized. Due to the
elimination of distributors and high-voltage lines, the energy
conduction loss and leakage loss are extremely small, and there is
no mechanical wear. Moreover, the ignition coil and spark plug of
each cylinder are assembled together, and the outer metal is
wrapped, which greatly reduces electromagnetic interference and can
ensure the normal engine electronic control system.
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