Engine control apparatus

An engine control apparatus comprising:

• an intake condition measuring device which is formed by means supplying a heating current to a temperature sensing element in accordance with a start pulse signal synchronous with the engine rotation, automatically stopping the supply of the heating current when the temperature of the element rises to a predetermined value, and generating an output pulse signal having a width T corresponding to the period during which the heating current has been supplied to the element;
• means for detecting a number of engine rotations;
• a plurality of map memory means for storing, in the form of a one-dimensional map, a plurality of functions f.sub.n (N), respectively, determined based on the number of engine rotations;
• interpolation calculation means which, by using said plurality of map memory means, performs interpolation calculation of the numerical values of functions f.sub.n (N), based on the number of engine rotations detected by said engine rotation number detecting means, for determining a plurality of coefficients a.sub.n in a polynomial approximation of ##EQU6## which expresses an intake air flow rate per engine rotation G/N by means of width T of the output pulse signal of the intake condition measuring device;
• fuel injection quantity calculation means for calculating the intake air flow rate per engine rotation G/N, on the basis of the numerical values of functions f.sub.n (N), calculated by the interpolation calculation means for determining the coefficients a.sub.n, and the width T of the output pulse signal of the intake condition measuring device, and by using the polynomial approximation ##EQU7## and for calculating a fuel injection quantity on the basis of the calculated intake air flow rate per engine rotation G/N;
• and
• fuel injection means for supplying an engine with a quantity of fuel corresponding to the fuel injection quantity calculated by the fuel injection quantity calculation means.