| 摘要 |
PURPOSE: To suppress generating a radiation sound from a direct injection Diesel engine over a wide range of operating conditions. CONSTITUTION: In a direct injection Diesel engine, an intake air heating means (a) of heating intake air sucked to a combustion chamber is provided, and an intake air temperature control means (b) of heating intake air, so as to reduce a high frequency noise in accordance with an operating condition of the engine, is provided. |
