Nappikäynnistystä

Nappikäynnistys, also known as push-button start, is a feature found in modern vehicles that allows the engine to be started and stopped without the need for a traditional key. Instead of inserting a key into an ignition cylinder and turning it, the driver presses a button to initiate the engine's startup sequence. This system is typically paired with a keyless entry fob or smart key that the vehicle detects is present within a certain range.

When the driver enters the vehicle with the recognized key fob, the system becomes active. To start the engine, the driver usually needs to press the brake pedal (for automatic transmissions) or clutch pedal (for manual transmissions) and then press the start button. The vehicle's computer then verifies the presence of the key fob and sends the necessary signals to the starter motor and fuel system to ignite the engine. To stop the engine, the driver simply presses the start button again, often while the vehicle is in park or neutral and the parking brake is engaged.

Nappikäynnistystä offers several advantages, including convenience and a more streamlined interior design by eliminating the need for a traditional ignition switch. It also contributes to vehicle security, as the system relies on the proximity of the correct key fob, making it more difficult to start the car without authorization. However, some older or less sophisticated systems have faced criticism regarding their susceptibility to relay attacks, where thieves can amplify the signal of the key fob to unlock and start the vehicle. Manufacturers have since implemented more advanced anti-theft technologies to mitigate these risks.