Tyhjäkäynnissä

Tyhjäkäynnissä refers to the state of an engine when it is running but not engaged in any gear, meaning the vehicle is stationary. This is commonly observed when a driver stops at a traffic light or in neutral gear. The engine continues to operate, consuming fuel and producing emissions, but no power is transmitted to the wheels.

The term originates from Finnish, where "tyhjä" means empty and "käynnissä" means running or in operation. Therefore, "tyhjäkäynnissä" literally translates to "running empty." In automotive contexts, it describes the engine's idle state.

Idling is a necessary function for many vehicles, allowing electrical systems to operate, the engine to remain warm, and for a quick resumption of motion once a gear is engaged. However, prolonged idling can lead to unnecessary fuel consumption and increased pollution. Many modern vehicles incorporate features like automatic start-stop systems to mitigate the effects of excessive idling. These systems automatically shut off the engine after a short period of inactivity and restart it when the driver intends to move again. Regulations in many regions also aim to limit unnecessary idling to reduce environmental impact. Understanding the concept of tyhjäkäynnissä helps in comprehending engine operation and fuel efficiency considerations in vehicles.