Nippondenso Co., Ltd.

Teruyoshi Itoh

Katsuharu Hosoe

Takeshi Matsui

Hiroshi Haraguchi

Toshiharu Iwata

Ryosuke Tachi

Hirotoshi Nakamura

Kou Narita

Toshihisa Yamamoto

Takao Nojiri

A vehicular information storage device includes an EEPROM, an extracting device which processes and extracts vehicle information, a determination device which determines from among regions set beforehand the region of the extracted information, and a counting device for incrementing a counter in correspondence with the region determined by the determination device. The needed information is extracted properly at a predetermined period along with the determination of the region where such information belongs. Further, the EEPROM used by the system is composed of three data regions with all three data regions set to a reset state at an initial state. The data regions are decremented sequentially at a minimum period required by a measurement parameter. Since updating from '1' to '0' is possible for individual cells and there is no need for resetting, processing time is reduced. Also, when data in one of the data regions is determined to be irregular due to, e.g., a power outage, it can be restored using the count values of the two other data regions.

Vehicular information storage device and power outage-resistant storage

A method and a system for controlling the ignition timing of internal combustion engines, or more in particular for preventing engine over-revolutions by reducing the engine speed when it becomes excessively high. The ignition timing control system is realized by a microcomputer, so that when the engine speed exceeds a predetermined high level, ignition stop operations by an ignition stop unit and ignition retard operations by a retarded ignition unit are repeated as many times as determined by the number of cylinders involved to reduce the engine speed. When the engine speed is in a predetermined high range, the ignition retardation is controlled by feedback in accordance with the engine speed, and further controlled in combination with the ignition stop as required. The method and system according to the invention is suitably used for a multi-cylinder internal combustion engine having an ignition system of electronic distribution type with a carburetor and a simultaneous ignition coil.

Ignition timing control system for internal combustion engines

In a knocking discriminating system for an internal combustion engine, a knocking detecting signal obtained from a knocking sensor is passed through a band-pass filter for obtaining a sinusoidal waveform of approximately 8 KHz. The sinusoidal waveform signal is then applied to an A/D converter, the operational timing of which is controlled by a microcomputer, so that only a part of the knocking detecting signal nearby the peak portion is converted into digital values. A discrimination level is prepared from the average value of the digital values, and the knocking status is discriminated by comparing the maximum value of the digital values thus converted with the discriminating level.

Knocking detecting apparatus for internal combustion engines

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Kariya, Japan

Teruyoshi Itoh