Patent ID: 9708991
Date: 2017-07-18
CPC Classifications: F02D,G01M,Y02T

Claim:
1. A method of estimating a residual mass in a cylinder after a combustion cycle, the method comprising: determining an estimated residual mass for a first combustion cycle based on an estimated residual mass for a previous combustion cycle; determining a value of a first performance variable for the first combustion cycle based only on engine data measured by one or more sensors; estimating a value of a second performance variable for the first combustion cycle based at least in part on the estimated residual mass for the first combustion cycle; determining an adaptive scaling factor for the first combustion cycle based on the determined value of the first performance variable for the first combustion cycle and the estimated value of the second performance variable for the first combustion cycle; and determining an adjusted residual mass for the first combustion cycle based on the estimated residual mass for the first combustion cycle and the adaptive scaling factor for the first combustion cycle.