Mitsubishi Electric Corporation

Akiyoshi Katayama

Takashi Matsumoto

Hitoshi Inoue

Morio Fujiwara

A device includes: actual-intake-pipe-pressure detection unit (); estimated-intake-pipe-pressure detection unit () for calculating an estimated intake pipe pressure based on a rotation speed of the engine and an opening degree of a throttle valve; pressure difference calculation unit () for calculating a pressure difference between the actual and estimated intake pipe pressures; pressure difference integration unit () for integrating the pressure difference with respect to time; pumping brake detection unit () for determining that a pumping brake operation is performed when a integral value is equal to or more than a first determination value; and throttle valve control unit () for carrying out control for the pumping brake during the pumping brake operation based on a result of the determination by the pumping brake detection unit (), and carrying out ordinary control otherwise.

Pumping brake detection and control device and method for internal combustion engine

An ignition timing control apparatus can obtain high output torque without generating output torque loss, and avoid the deterioration of audibility due to successive knock occurrences. A cylinder specific ignition timing setting section includes a reference ignition timing control section, and a cylinder specific correction value setting section having correction values of the same number as that of engine cylinders. The reference ignition timing control section calculates reference ignition timing common to all the cylinders and uniformly controls the ignition timings of all the cylinders to a retard angle side to prevent the occurrence of successive knocks. The cylinder specific correction value setting section calculates cylinder specific correction values to compensate for variation in the cylinder specific optimal ignition timings, and sets the cylinder specific correction values for cylinders other than those whose knock frequency becomes equal to a predetermined value or more so as to advance their ignition timings.

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Kobe, Japan

Akiyoshi Katayama