| 摘要 |
An internal combustion engine (1) having a variable compression ratio mechanism (2) and comprising a common rail fuel injection device using a mechanically driven high-pressure fuel pump (46). The fuel pressure (P) inside the common rail (45) is read (step 1). If the maximum fuel pressure (Pmax) is exceeded (step 3) and if the difference (ΔＰ) from a target fuel pressure (tP) exceeds a threshold value (ΔＰmax) (step 4), the fuel pressure (P) is determined to have an abnormal increase and the target compression ratio for the variable compression ratio mechanism is set to the minimum compression ratio (εmin) (step 6). As a result, the rotation variation of the crank shaft (21) is reduced, therefore the variation in tension of the chain (43) is alleviated and reduction in chain (43) durability is suppressed. |
