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An air-fuel ratio control apparatus for an internal combustion engine operates a signal of inner pressure of cylinder and a signal of crank angle position to obtain the maximum value of a rate of pressure increase in an ignition cycle or the mean value of the maximum values in a predetermined number

An air-fuel ratio control apparatus for an internal combustion engine operates a signal of inner pressure of cylinder and a signal of crank angle position to obtain the maximum value of a rate of pressure increase in an ignition cycle or the mean value of the maximum values in a predetermined number of cycles, whereby a fuel injection quantity is controlled by using said value. An exhaust gas temperature may be used as well as the signals of the inner pressure of cylinder and the crank angle. In this case, a fuel injection quantity is controlled on the basis of a state quantity obtained by calculating the inner pressure of cylinder and a temperature of exhaust gas.

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An air-fuel ratio control apparatus for an internal combustion engine adapted to measure an intake air quantity and an engine revolution number to thereby calculate a basic fuel injection quantity based on said measured intake air quantity and said engine revolution number and to output an instructi

An air-fuel ratio control apparatus for an internal combustion engine adapted to measure an intake air quantity and an engine revolution number to thereby calculate a basic fuel injection quantity based on said measured intake air quantity and said engine revolution number and to output an instruction signal to inject an amount of fuel to a cylinder, which comprises a pressure detecting means to detect an inner pressure of cylinder, a crank angle detecting means to detect a crank angle of the engine, and a control device which is adapted to receive the output signals of said pressure detecting means and said crank angle detecting means so as to obtain the maximum value of a rate of pressure increase in an ignition cycle of the engine or the mean value of the maximum values in a predetermined number of cycles of the engine, and to control a fuel injection quantity in response to the thus obtained maximum value or the mean value. An air-fuel ratio control apparatus for an internal combustion engine adapted to measure an intake air quantity and an engine revolution number to thereby calculate a basic fuel injection quantity based on said measured intake air quantity and said engine revolution number and to output an instruction signal to inject an amount of fuel to a cylinder, which comprises a pressure detecting means to detect an inner pressure of cylinder, a crank angle detecting means to detect a crank angle of the engine, an exhaust gas temperature detecting means to detect a temperature of exhaust gas and a control device which is adapted to receive the output signals of said pressure detecting means, said crank angle detecting means and said exhaust gas temperature detecting means, to calculate a state quantity based on the signals of said inner pressure of cylinder in an ignition cycle, and to control a fuel injection quantity by using said state quantity and a value of exhaust gas temperature Te obtained by the output of said exhaust gas temperature detecting means.