Feedback control method for internal combustion engine

Abstract

Abstract PURPOSE:To control a rotation speed at a high speed with high precision, by a method wherein, based on a mathematical model determined in a way that the dynamic physical model of an internal combustion engine is digitized by sampling at each specified crank angle, a feedback control amount is decided. CONSTITUTION:A rotation speed omega of an engine 2 and an intake air pressure P are detected, omega<2> is determined by means of a multiplying part M2. Based on a methematical model in that, in a linear computing part M3, a dynamic physical model is digitized by sampling at each specified crank angle, two omega<2> and a first feedback amount Fa relating P is determined. A deviation er between a square value omega<2> and a square value omegar<2> of a target rotation speed by a set part M1 is orderly added by means of an adder M4. A multiplying part M5 multiplies an element fa relating to an orderly adding value of an optimum feedback gain F by a multiplying part M5 to determine a second feedback amount fa. SIGMAer. The two feedback amounts are added to determine a control amount S/omega, and by multiplying omega by means of a multiplier M6 to determine a control amount S by means of which an intake air amount is regulated. This constitution enables control of a rotation speed with high precision.

Inventors

• 👤 Akira Ohata
• 👤 明 大畠

Bibliographic Details