Patent ID: 9008949
Filing Date: 2015-04-14
Classification: F01N,F02D,Y02T

Abstract:
1. A soot discharge estimating device for an internal combustion engine comprising: a steady discharge amount acquisition device that acquires a steady discharge amount of soot on the basis of a previously stored relation between discharge amount of soot discharged from the internal combustion engine and at least operation speed and fuel injection amount of the internal combustion engine in the case where the internal combustion engine is in a steady operation state, and respective current values of the operation speed and the fuel injection amount; a steady value acquisition device that acquires a steady value of a mist equivalence ratio at a timing of starting ignition, the mist equivalence ratio being a value based upon a ratio of a fuel amount to an air quantity in a fuel mist, on the basis of a previously stored relation between a value of a predetermined parameter that represents an operation state of the internal combustion engine and the value of the mist equivalence ratio at the time of starting ignition in the case where the internal combustion engine is in the steady operation state, wherein the value of the mist equivalence ratio at the time of starting ignition is obtained on the basis of an ignition delay period that is a period between a time of starting fuel injection and the time of starting ignition, and a current value of the predetermined parameter; a transient value acquisition device that acquires a current value of the ignition delay period, and acquires a transient value of the mist equivalence ratio at the time of starting ignition based upon at least the acquired current value of the ignition delay period, wherein the transient value is a current value of the mist equivalence ratio at the time of starting ignition; a transient correction value calculation device that calculates a transient correction value regarding the discharge amount of soot from a steady characteristic value and a transient characteristic value, the steady characteristic value being obtained on the basis of the steady value of the mist equivalence ratio at the time of starting ignition and a previously stored characteristic that represents a change in the discharge amount of soot with the value of the mist equivalence ratio, and the transient characteristic value being obtained on the basis of the transient value of the mist equivalence ratio at the time of starting ignition and the characteristic; and a soot discharge amount estimation device that estimates the discharge amount of soot on the basis of the steady discharge amount and the transient correction value.