| 摘要 |
<p>The purpose of the present invention is to enable the waste gate valve opening degree to be accurately estimated in a supercharged engine. For this purpose, a control device as an embodiment of the present invention acquires the estimated value of the waste gate valve opening degree corresponding to the operation amount of a waste gate valve in accordance with a predefined correspondence relationship, and, on the basis of the estimated value, derives a first relationship established between the throttle downstream pressure and the intake valve flow rate from an intake valve model. Further, on the basis of the measured value of the throttle opening degree and the measured value of the throttle upstream pressure, the control device derives a second relationship established between the throttle downstream pressure and the throttle flow rate from a throttle model. Then, on the basis of the first relationship and the second relationship, the control device calculates the estimated value of the intake valve flow rate when the intake valve flow rate and the throttle flow rate match, and on the basis of the result of the comparison between the estimated value and the measured value of the intake air flow rate, adjusts the correspondence relationship between the estimated value of the waste gate valve opening degree and the operation amount of the waste gate valve.</p> |
