×

Method of determining the engine charge temperature for fuel and spark control of an internal combustion engine

  • US 6,286,366 B1
  • Filed: 11/11/1998
  • Issued: 09/11/2001
  • Est. Priority Date: 11/11/1998
  • Status: Expired due to Term
First Claim
Patent Images

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; and

    determining 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;



    Tm


    t
    =



    fcv

    (N,P,EGR)






    (Tm-Tin)
    +fcd

    (Vs,Vf,Tc)


    (To+Tin)
    +




    fcr

    (Vs,Vf,Tc)


    Tck4
    +fmr

    Tmk4
    where fcv is a coefficient for the first term, fcd is a coefficient for the second term, fcr is a coefficient for the third term and fmr is a coefficient for the fourth term, wherein the coefficients fcv, fcd, fcr, and fmr are based on vehicle parameters, N is the engine speed, P is the intake manifold pressure, BGR is the exhaust gas recirculation condition, Vs is the vehicle speed, Vf is the radiator fan on/off state, Tc is the engine coolant temperature and Tm is the charge air temperature.

View all claims
  • 21 Assignments
Timeline View
Assignment View
    ×
    ×