Turbochargers are increasingly used in diesel engines for buses, significantly improving the engine's air intake efficiency. By using turbochargers, diesel engines achieve higher power output, reduced fuel consumption, and lower emissions. This not only enhances indicated power, effective power, and mechanical efficiency but also significantly improves the economy of high-load operations. The short ignition delay and low pressure rise rate of turbochargers reduce combustion noise, making them particularly advantageous for bus diesel engines that frequently operate at full load and high speed. Turbocharging is a key technology for meeting Euro emissions standards in buses.