| 摘要 |
In an intake system for an internal combustion engine having a supercharger, there are provided a first air passage and a second air passage each for conducting air from the supercharger to the engine. An air cooler is disposed in the first air passage to supply the engine with cooled air, but the second air passage leads air directly from the supercharger to the engine without cooling the air. The air flow rates in the first and the second air passages are controlled by suitable control means to supply the engine with intake air of an appropriate temperature. The control means is intended to restrict the air flow in the first air passage at low engine load to prevent the intake air from being cooled excessively. Preferably the control means is a throttle valve device which comprises a primary throttle valve disposed in a primary throttle bore communicating with the second air passage, and a secondary throttle valve disposed in a secondary throttle bore communicating with the first air passage.
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