気化器の空燃比応答特性に由来するエンジンの自励振動 : 第3報,記述関数法による安定判別

概要

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The authors have developed a mathematical formulation of the lean hunting phenomenon in which time-varying air-fuel ratio is expressed by a nonlinear differential equation. Also included is the equation of motion for the crankshaft in which engine torque is expressed by a parabolic function peaking at the optimal air-fuel ratio. In this paper, in an effort to to develop a different mathematical formulation of the phenomenon, the lag in air-fuel ratio response is represented by the translated function, and the saturation characteristic of engine torque is represented by a cubic function. To exploit the simplicity of linear analysis, the describing function method is employed for the stability analysis. The Nyquist diagram is drawn to examine stability criterion, and a simple equation to predict the period of limit cycle is derived.
一般社団法人日本機械学会の論文
1995-03-25