초록 ▼

A technique for determining the charge air temperature within an intake manifold of an internal combustion engine of a vehicle without using a dedicated temperature sensor. The technique includes identifying a non-linear dynamic model based on the physical concepts of thermal transfer and system ide

A technique for determining the charge air temperature within an intake manifold of an internal combustion engine of a vehicle without using a dedicated temperature sensor. The technique includes identifying a non-linear dynamic model based on the physical concepts of thermal transfer and system identification technique. The charge air temperature model uses several available physical measurements from the vehicle, including inlet air temperature, engine coolant temperature, vehicle speed, manifold pressure, engine speed, exhaust gas recirculation condition, and the engine fan on/off state. The model parameters are determined based on specific vehicle characteristics, and collected data from the vehicle. The charge air temperature is predicted by the model at regular predetermined intervals from the physical measurements, the vehicle parameters and the charge air temperature from the previous time. An estimation of an initial charge air temperature when the vehicle is turned on can be obtained based on the available temperature sensor readings when vehicle is turned on and stored data of the charge temperature, and all the measured temperature readings just before the engine was turned off.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of determining a charge air temperature of a vehicle, said method comprising the steps of:determining an inlet air temperature to a manifold of the vehicle;determining an engine coolant temperature;determining a speed of the vehicle;determining a manifold absol

[ What is claimed is:] [1.]1. A method of determining a charge air temperature of a vehicle, said method comprising the steps of:determining an inlet air temperature to a manifold of the vehicle;determining an engine coolant temperature;determining a speed of the vehicle;determining a manifold absolute pressure within the manifold of the vehicle;determining a speed of the vehicle engine;determining an exhaust gas recirculation condition;determining an on/off state of a vehicle engine fan; anddetermining the charge air temperature based on heat transfer and vehicle parameters, including determining the charge air temperature by an equation that uses the inlet air temperature, the engine coolant temperature, the vehicle speed, the manifold pressure, the engine speed, the exhaust gas recirculation condition and the engine fan on/off state as inputs to the equation, wherein the step of determining the charge air temperature includes adding together several heat contribution terms, wherein a first heat contribution term is based on the engine speed, the manifold pressure and the exhaust gas recirculation condition, a second heat contribution term is based on the vehicle speed, the radiator fan on/off state, and the engine coolant temperature, a third heat contribution term is based on the vehicle speed, the radiator fan on/off state and the engine coolant temperature, and a fourth heat contribution term is based on the heat transfer of the manifold, and wherein the equation is: re f.sub.cv is a coefficient for the first term, f.sub.cd is a coefficient for the second term, f.sub.cr is a coefficient for the third term and f.sub.mr is a coefficient for the fourth term, wherein the coefficients f.sub.cv, f.sub.cd, f.sub.cr, and f.sub.mr are based on vehicle parameters, N is the engine speed, P is the intake manifold pressure, BGR is the exhaust gas recirculation condition, V.sub.s is the vehicle speed, V.sub.f is the radiator fan on/off state, T.sub.c is the engine coolant temperature and T.sub.m is the charge air temperature.