Patent ID: 9689778
Date: 2017-06-27
CPC Classifications: G01M,G01N,Y02A

Claim:
1. A method of estimating a current soot output from an engine, the method comprising: sensing a mass flow rate of a flow of exhaust gas from the engine; defining a soot output base rate of the engine, with a controller, when the engine is operating at a reference state; calculating a soot ratio for a current operating state of the engine, with a controller; multiplying the mass flow rate, the soot output base rate, and the soot ratio together to define an estimated value of the current soot output from the engine; and controlling an exhaust gas treatment system connected to the engine, with the controller, based upon the estimated value of the current soot output from the engine; wherein the soot ratio is calculated from the equation: wherein AFRpor is an air/fuel ratio portion of the soot ratio, EGRpor is an exhaust gas recirculation portion of the soot ratio, InjPpor is a fuel injection pressure portion of the soot ratio, and InjTpor is a fuel injection timing portion of the soot ratio; wherein the air/fuel ratio portion is calculated from the equation: wherein AFR is an air/fuel ratio of the engine at the current operating state, a AFR is an AFR term coefficient for the air/fuel ratio, ƒ AFR is a functional timing value of the air/fuel ratio, and AFR base is an air/fuel ratio base value of the engine when the engine is operating at the reference state; wherein the exhaust gas recirculation portion is calculated from the equation: wherein EGR is an exhaust gas recirculation ratio of the engine at the current operating state, a EGR is an EGR term coefficient for the exhaust gas recirculation ratio, ƒ EGR is a functional timing value of the exhaust gas recirculation ratio, and EGR base is an exhaust gas recirculation base ratio of the engine when the engine is operating at the reference state; wherein the fuel injection pressure portion is calculated from the equation: wherein AFR is the air/fuel ratio of the engine at the current operating state, InjP is a fuel injection pressure of the engine at the current operating state, a InjP is an InjP term coefficient for the air/fuel ratio, ƒ InjP is a functional timing value of the fuel injection pressure of the engine, and InjP base is a fuel injection pressure base value of the engine when the engine is operating at the reference state; and wherein the fuel injection timing portion is calculated from the equation: wherein InjT is a fuel injection timing of the engine at the current operating state, ƒ InjT is a functional value of the fuel injection timing of the engine, and InjT base is a fuel injection timing base value of the engine when the engine is operating at the reference state.