What are the ignition methods for automobiles?
2 Answers
Based on the ignition methods of automobile engines, they can be divided into compression ignition and spark ignition. Below are the relevant introductions to compression ignition and spark ignition: 1. Compression ignition: This corresponds to the ignition method of diesel engines. Diesel engines use diesel as fuel. Compared to gasoline, diesel has a lower auto-ignition temperature (around 220°C), higher viscosity, and is less prone to evaporation. Additionally, diesel engines do not have spark plugs, and their compression ratio is higher than that of gasoline engines. Therefore, diesel engines rely on the compression stroke to compress the air-fuel mixture to the ignition point, causing it to auto-ignite. Hence, this ignition method is called compression ignition. 2. Spark ignition: This corresponds to the ignition method of gasoline engines. The auto-ignition temperature of gasoline (around 480°C) is higher than that of diesel, and its viscosity is lower, making it easier to evaporate. As a result, gasoline can form a uniform mixture with air outside the cylinder or be directly injected into the cylinder using a fuel injection system. Then, near the end of the compression stroke, the mixture is ignited by the spark from the spark plug. Hence, this ignition method is called spark ignition.
I've been driving for decades, and the way to start a car has changed a lot. The earliest was the traditional key ignition, where you had to insert the key into the hole on the steering column and turn it to start the engine. It was reliable but a bit cumbersome. Later came the push-button start, where the car starts by simply pressing a button on the center console as long as the key is on you. This was revolutionary in terms of convenience, saving time and reducing wear. Nowadays, new cars even have remote start, allowing you to start the car remotely with the key fob, which is great for warming up in winter or cooling down in summer. I've tried some high-end cars that can even be started via a smartphone app, but it requires a strong phone signal. Despite all these technological advancements, I still miss the feel of the key, because electronic systems can sometimes freeze or run out of battery, which can be embarrassing. I recommend regularly maintaining the key battery.
