| 摘要 |
<p>The present invention relates to a two-step turbocharger device, capable of supplying additional air to a cylinder by using a compressor, but supplying the air to the cylinder by compressing the air twice by using a high voltage turbocharger and a low voltage turbocharger. The present invention forms a new type of cooling water control method, capable of bypassing cooling water supplied to a water-cooling type compressor housing of the low voltage turbocharger in a low speed section after the start of an engine by including a thermostat in a path for supplying and collecting the cooling water to the water-cooling type compressor housing. Therefore, the two-step turbocharger is capable of improving durability and mileage by fundamentally preventing a compression air heating phenomenon occurring in a low-speed section.</p> |
