| 摘要 |
<p>PURPOSE:To control supercharging pressure desirably through the setting of specified conditions by providing a release valve on one of the two pressure leading passages communicating from an actuator with an air supply passage on the downstream side of a compressor. CONSTITUTION:At an ordinary temperature, a closing valve 94 is in closing operation to intercept a second pressure leading passage 92 and supercharge pressure in an air supply passage 4 on the downstream side of a compressor 10 acts only on a first pressure chamber 64, and a waste gate valve 34 opens or closes according to the balance with a closing spring 70. At a low temperature, thrust quantity of a rod 68 lacks up conventionally, but the closing valve 94 performs opening action and a second pressure leading passage 92 is communicated. Supercharged pressure in the air supply passage 4 at the downstream side of the compressor 10 is acting on both first pressure chamber 64 and second pressure chamber 66. Thereby, it is possible to control the supercharge pressure set value set under ordinary temperature so as never to exceed at a low temperature.</p> |
