INTERNAL COMBUSTION ENGINE CONTROL DEVICE

To provide an internal combustion engine control device capable of accurately learning a degree of clogging of a throttle valve in a wide opening region while reducing a computational load and a memory capacity.SOLUTION: An internal combustion engine control device calculates a clogging ratio KTHC using a first flow rate function (KTH when a throttle valve is new and KTH with maximum clogging) when a degree of clogging of a throttle valve 5 is in a reference state and a second flow rate function (estimated KTH) estimated on the basis of an intake air amount GAIR. The internal combustion engine control device is configured to: acquire sample points obtained by combining the second flow rate function with throttle valve openings TH for respective predetermined periods (step 1); calculate a learning point by averaging a plurality of sample points for each predetermined opening region (Fig.8); calculate coefficients a to c in an approximation function (formula (8)) of second flow rate function characteristics (estimated KTH characteristics) through the least-square method on the basis of the plurality of learning points (step 41); and calculate the clogging ratio KTHC on the basis of the second flow rate function characteristics approximated with the approximation function using the coefficients a to c and the first flow rate function.SELECTED DRAWING: Figure 2 【課題】スロットル弁の詰まり度合の学習を、演算負荷及びメモリ容量を低減しながら、広い開度領域にわたって精度良く行える内燃機関の制御装置を提供する。【解決手段】本発明では、スロットル弁５の詰まり度合が基準状態のときの第１流量関数（新品時ＫＴＨ、最大詰まり時ＫＴＨ）と、吸入空気量ＧＡＩＲに基づいて推定された第２流量関数（推定ＫＴＨ）を用いて、詰まり率ＫＴＨＣを算出する。所定期間ごとに、第２流量関数とスロットル弁開度ＴＨと組み合わせたサンプル点を取得し（ステップ１）、所定の開度領域ごとに複数のサンプル点を平均して学習点を算出する（図８）。複数の学習点に基づき、第２流量関数特性（推定ＫＴＨ特性）の近似関数（式（８））の係数ａ～ｃを、最小二乗法によって算出し（ステップ４１）、係数ａ～ｃを用いた近似関数で近似された第２流量関数特性と第１流量関数に基づき、詰まり率ＫＴＨＣを算出する。【選択図】図２