US 5,474,045 AGranted

Engine control device

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsAkira Demizu, Masakazu Sugai, Hitoshi Inoue, Ryoji Nishiyama, Hideaki Katashiba

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Abstract

An engine control device comprises: crank angle sensor provided for the cylinders of an engine; cylinder internal pressure sensor for detecting the internal pressures of the cylinders according to the output signals of the crank angle sensor; pressure normalizing unit for normalizing the cylinder internal pressures thus detected, according to the cylinder internal pressure which is obtained when the engine is in standard state; engine speed detector; charge efficiency calculating unit for calculating the charge efficiencies of the cylinders by using the output signals of the pressure normalizing unit and the engine speed detector; operating condition detecting unit for detecting the outputs of the pressure normalizing unit and the engine speed detector as operating conditions, calculation control unit for calculating the air/fuel ratio and the ignition timing of each cylinder according to the operating conditions; and adjusting unit for adjusting the air/fuel ratios and ignition timing of the cylinders according to the output of the calculation control unit, thereby to control the air/fuel ratios and ignition timing of the cylinders with high accuracy.

Claims9

Dependent claims

A control device for controlling an engine having a plurality of cylinders, comprising:

crank angle detecting means for detecting predetermined crank angles of said engine;
cylinder internal pressure detecting means for detecting the internal pressures of said cylinders according to output signals provided by said crank angle detecting means;
pressure normalizing means for normalizing, according to a predetermined reference cylinder internal pressure, said cylinder internal pressures measured by said cylinder internal pressure detecting means;
engine speed detecting means for detecting a revolving speed of said engine;
means for obtaining values corresponding to charge air quantities of said cylinders by using an engine speed detected by said engine speed detecting means and said cylinder internal pressures normalized by said pressure normalizing means;
operating condition detecting means for detecting said values thus obtained and said engine speed as operating conditions;
calculation control means for calculating the air/fuel ratios and the ignition timing of said cylinders according to said operating conditions;
air/fuel ratio adjusting means for adjusting the air fuel ratio of said engine according to said air/fuel ratios calculated by said calculation control means;
and
ignition timing adjusting means for adjusting the ignition timing of said cylinders according to said ignition timing calculated by said calculation control means.

7 more elements

Dependencies are inferred from the claim text.