| 摘要 |
<p>PURPOSE:To increase output to a high level and decrease fuel consumption by setting a compression ratio to a high level and suppressing generation of knocking. CONSTITUTION:A compression ratio is set to a high value for good heat efficiency and a variable mechanism 8 for varying opening/closing timing of an intake valve is provided on an intake cam shaft 2. A control unit 9 for varying the valve closing timing of the intake valve at the time of low-rotation high-load is connected to the variable mechanism 9. The valve closing timing of the intake valve is varied at the time of low-rotation high-load, and startup timing of compression is delayed and then real compression ratio is decreased. Consequently, the compression ratio can be set to a high level while knocking is suppressed, and high output can be secured and fuel consumption is decreased.</p> |
