imusarjaruiskutusjärjestelmä

Imusarjaruiskutusjärjestelmä, often referred to by its English acronym CIS (Continuous Injection System), is a type of fuel injection system used in internal combustion engines. Its primary function is to deliver fuel to the engine cylinders in a controlled and continuous manner. Unlike multi-point injection systems that inject fuel at discrete intervals, the CIS system sprays fuel throughout the entire intake stroke.

The core components of a typical Imusarjaruiskutusjärjestelmä include a fuel distributor, a warm-up regulator, and an air flow meter. The fuel distributor is responsible for splitting the incoming fuel from the fuel pump and delivering it to each injector. The warm-up regulator plays a crucial role in adjusting fuel pressure during cold starts, ensuring a richer fuel mixture for easier engine ignition and smoother operation. The air flow meter measures the amount of air entering the engine, and this data is used by the fuel distributor to regulate the fuel flow accordingly, aiming to maintain an optimal air-fuel ratio.

Imusarjaruiskutusjärjestelmä systems were widely adopted in the 1970s and 1980s, particularly by European manufacturers, as an improvement over carburetors. They offered better fuel efficiency and emissions control compared to earlier technologies. However, the system's mechanical nature and lack of precise electronic control meant it was eventually superseded by more sophisticated electronic fuel injection (EFI) systems. While largely obsolete in modern vehicles, understanding the principles of CIS provides insight into the evolution of fuel delivery technologies in automobiles.