How does the engine work? Working principle of variable valve

The camshaft is a component in a piston engine. Its role is to control the opening and closing actions of the valve. Driven by the crankshaft, the camshaft continuously rotates, and the cam continuously presses the valve (rocker arm or ejector rod), thereby realizing the function of controlling the opening and closing of the intake valve and the exhaust valve.

Does the automatic engine start and stop function save fuel or ruin the car?

The engine automatic start-stop technology actually appeared in the 1930s, but it was not widely used in traditional cars until the mid-1980s. In 1984, the automatic start-stop technology was first applied to Volkswagen Golf diesel engines. Subsequently, many car brands have a strong interest in the technology, and began to trial install the system in small batches, such as Fiat Mazda, Honda, Citroen, GM and so on. In 2007, this technology began to be applied in large quantities on BMW models.

Open the engine cover, you can also do these vehicle detection, it is recommended to collect!

Many car owners find that the car is a bit wrong and like to open the engine cover (also called the engine compartment cover), “check” some, but in fact many car owners do not understand the structure of the engine compartment, some car owners do not even open it, When it finally opened, I looked at it a little bit at a loss. The following will tell the majority of car owners, after opening the engine cover, what tests can you do?