| 摘要 |
The purpose of the present invention is to provide an engine with which calculation errors related to EGR gas weight can be inhibited on the basis of an operation state. Accordingly, provided is an engine 1 which is provided with an EGR device 8 for recirculating, into an intake gas, a portion of an exhaust gas as an EGR gas, said engine 1 wherein: an actual intake/exhaust gas pressure ratio À1 of an intake-gas pressure P1 to an exhaust-gas pressure P2 is calculated from the detected exhaust-gas pressure P2 and the detected intake-gas pressure P1; an estimated intake/exhaust gas pressure ratio À2 of the intake-gas pressure P1 to the exhaust-gas pressure P2 is calculated from a rotational frequency N, i.e. the engine rotational frequency, and an injection amount F, i.e. the fuel injection amount; and, in cases when the actual intake/exhaust gas pressure ratio À1 is less than a prescribed value À0, an EGR gas weight Megr is calculated on the basis of the actual intake/exhaust gas pressure ratio À1, and in cases when the actual intake/exhaust gas pressure ratio À1 is equal to or more than the prescribed value À0, the EGR gas weight Megr is calculated on the basis of the estimated intake/exhaust gas pressure ratio À2. |
