Patent ID: 6115664
Filing Date: 2000-09-05
Classification: F02D

Abstract:
Method of estimating a total charge entering cylinders of an internal combustion engine where the total charge comprises the sum of an air charge and an EGR charge, comprising:a) determining a linear total charge versus MAP reference function at selected engine speeds and a reference barometric pressure value, reference engine coolant temperature value, and reference manifold air charge temperature value,b) determining a current barometric pressure value,c) determining a current engine coolant temperature value,d) determining a current manifold air charge temperature value,e) adjusting an intercept of said function with a total charge axis for current barometric pressure value different from said reference barometric pressure value,f) adjusting a slope of said function for current engine coolant temperature value and current manifold air charge temperature value different from said reference engine coolant temperature value and said reference manifold air charge temperaturevalue, andg) determining an adjusted total charge at a current engine speed based on the adjusted intercept and the adjusted slope of said function.