Patent ID: 9574971
Date: 2017-02-21
CPC Classifications: F02D,G01M

Claim:
1. A method for assessing a cold start emission reduction (CSER) strategy applied to an engine system, the method comprising: determining a first accumulation value based on an estimated output signal that would result from applying a first control command to the engine system; determining a second accumulation value based on a measured output signal resulting from applying a second control command that implements the CSER strategy to the engine system; comparing the first accumulation value and the second accumulation value; and determining whether the applying the second command to the engine system achieved a performance threshold of the CSER strategy based on the comparing, wherein the comparing comprises determining whether a difference between the first accumulation value and the second accumulation value is greater than a threshold value, wherein it is determined that the applying the second command to the engine system achieved the performance threshold if the difference is greater than the threshold value, wherein it is determined that the applying the second command to the engine system did not achieve the performance threshold if the difference is less than or equal to the threshold value, and wherein the first accumulation value includes an estimated air mass of exhaust gas that has been recirculated to the engine system, the second accumulation value includes a measured air mass of exhaust gas that has been recirculated to the engine system, and the second control command controls an actual flow rate of an exhaust gas from an engine of the engine system to recirculate back to the engine.