Does CDI ignition need battery?
AC-CDI is fitted to the majority of bikes, generators, chainsaws etc. Requires no battery at all for the engine to start and run. The energy comes direct from the flywheel generator. DC-CDI however requires a low voltage supply (typically 12 V).
What’s the difference between CDI and ECU?
When there is no triggering signal the charging circuit is re-connected to charge the capacitor. The CDI referenced in some models of Polaris is controlled by the ECU (electronic control unit). The ECU is an electronic switch which stops the flow of current in an inductive discharge ignition system.
How does a capacitor discharge ignition ( CDI ) system work?
Working principle a CDI System. A capacitor discharge ignition works by passing an electrical current over a capacitor. This type of ignition builds up a charge quickly. A CDI ignition starts by generating a charge and storing it up before sending it out to the spark plug in order to ignite the engine.
Why are CDI ignition systems used on IC engines?
There appears to be a lot of misunderstanding and confusion about the capacitor discharge ignition systems used today on most small IC engines. The reason for the popularity of CDI systems is that they are easier to miniaturize than the old fashioned but rugged magneto setups as found for instance on the B&S lawn mowers.
How does a CDI pulse transformer ignition system work?
In a CDI ignition system,a storage capacitor is charged to a high voltage (a few hundred volts) by the flywheel charging coil and, at the proper moment quickly discharged into the primary winding of the ignition coil,which is actually a stepup pulse-transformer.
How does the spark timing on a CDI work?
The spark timing is controlled by a small trigger coil located in close proximity to the flywheel which generates a low voltage pulse (actually two, a positive and a negative one), as the fly wheel magnet passes by.
Working principle a CDI System. A capacitor discharge ignition works by passing an electrical current over a capacitor. This type of ignition builds up a charge quickly. A CDI ignition starts by generating a charge and storing it up before sending it out to the spark plug in order to ignite the engine.
There appears to be a lot of misunderstanding and confusion about the capacitor discharge ignition systems used today on most small IC engines. The reason for the popularity of CDI systems is that they are easier to miniaturize than the old fashioned but rugged magneto setups as found for instance on the B&S lawn mowers.
What happens when you turn off the CDI on a motor?
When we want to shut down the motor engine, we have two switches the key switch or the kill switch. The switches ground out the charging circuit so the entire charging pulse is sent to the ground. Since the CDI can no longer charge, it will cease to provide the spark and the engine will slow to a stop.
In a CDI ignition system,a storage capacitor is charged to a high voltage (a few hundred volts) by the flywheel charging coil and, at the proper moment quickly discharged into the primary winding of the ignition coil,which is actually a stepup pulse-transformer.