Patent ID: 6622548
Filing Date: 2003-09-23
Classification: F02D,G01K,G01M

Abstract:
An apparatus for estimating a plurality of gas temperatures in an engine of a vehicle, comprising:an exhaust temperature estimator configured to receive a velocity of the vehicle and an air mass flow rate, said exhaust temperature estimator configured to estimate an exhaust gas temperature based at least upon said velocity of the vehicle and said air mass flow rate; a first recirculated engine exhaust gas (EGR) temperature estimator coupled to said exhaust temperature estimator, said first EGR temperature estimator configured to receive said exhaust gas temperature from said exhaust temperature estimator and further configured to receive an EGR mass flow rate, said first EGR temperature estimator configured to estimate an EGR gas temperature at an EGR valve of the engine based at least upon said exhaust gas temperature and said EGR mass flow rate; a second EGR temperature estimator coupled to said exhaust temperature estimator, said second EGR temperature estimator configured to receive said exhaust gas temperature from said exhaust temperature estimator and further configured to receive said EGR mass flow rate, said second EGR temperature estimator configured to estimate an EGR gas temperature at a throttle body of the engine based at least upon said exhaust gas temperature and said EGR mass flow rate; and a charge temperature estimator coupled to said second EGR temperature estimator, said charge temperature estimator configured to receive said EGR gas temperature at said throttle body from said second EGR temperature estimator, said charge temperature estimator further configured to receive said velocity of the vehicle and said EGR mass flow rate, said charge temperature estimator configured to estimate a charge gas temperature based at least upon said EGR gas temperature at said throttle body, said velocity of the vehicle, and said EGR mass flow rate.