What are the ignition methods of gasoline engines?

[BrodyMarie]

Gasoline engines have the following ignition methods: 1. Capacitor discharge controlled by single-cylinder thyristor: mainly used in motorcycles. 2. High-voltage mechanical rotating distributor type: still used in some cars, but gradually being phased out due to high losses and requiring maintenance. 3. Computer-controlled dual-cylinder simultaneous ignition method: only used for even-numbered cylinder engines, where a pair of cylinders reaching top dead center simultaneously spark together. 4. Single-cylinder independent ignition method: each cylinder has its own ignition coil without high-voltage wires, representing the best ignition system, all using vacuum ignition. Additional information: Ignition system: A device in oil engines used to ignite the combustible mixture in the cylinder. Its function is to provide high-voltage electricity with sufficient energy to the spark plug in the order of cylinder ignition, generating sparks between the spark plug electrodes to ignite the compressed combustible mixture in the cylinder.

[StCaden]

I understand several ignition methods for gasoline engines. The most basic is the contact point system, which relies on a distributor and mechanical contacts to control spark plug ignition, but the contacts are prone to burning and aging, leading to unstable ignition. The electronic ignition system, controlled by sensors and modules, is more reliable and efficient, avoiding mechanical wear. Distributorless ignition systems, such as direct ignition, independently control ignition coils for each cylinder, providing precise and fast ignition response with reduced lag. There are also methods like capacitive discharge ignition and inductive ignition, achieved through different circuits. Modern vehicles mostly use electronically controlled ignition to improve fuel efficiency and emissions performance. Ignition system failures may cause starting difficulties or engine shaking, and regular inspection of spark plugs and wires can prevent issues.

[DelMia]

As a daily driver, the ignition method affects my driving smoothness. The old-fashioned distributor ignition starts slowly and is difficult to start in winter, while electronic ignition starts instantly with a turn of the key, making it more convenient. The reliability of ignition is crucial. If the spark plug ignition timing is off, the engine will shake, affecting power output. Nowadays, distributorless systems are popular as they reduce components, making them more compact and safer. Efficient ignition can also save fuel and lower vehicle operating costs. Poor ignition control can lead to excessive exhaust emissions or sluggish acceleration. Regular maintenance, such as checking the spark plug condition, ensures the ignition system operates properly and prevents breakdowns.

[NatalieDella]

Common ignition problems during car repair include burnt distributor contacts requiring replacement and electronic module damage causing ignition delay. Contact point systems are prone to failure, leading to startup issues, while electronic ignition with sensor monitoring is more durable. Direct ignition independently controls each spark plug, offering reliability with fewer failures. Workshops often check spark plug gaps and poor wire connections during ignition maintenance. Ignition methods affect maintenance frequency—contact point systems have higher failure rates over time, whereas electronic systems last longer. For ignition faults, first test battery voltage, then inspect spark plug condition for step-by-step troubleshooting. Modern car ignition systems integrate complex diagnostic codes to save time.