Nippondenso Co., Ltd.

Denso Corporation

Toyota Jidosha Kogyo Kabushiki Kaisha

Denson Corporation

Kazuyoshi Tamaki

Yoshimasa Furuike

Takao Mitsui

Jiro Nakano

Hiromi Ariyoshi

Hironobu Ono

Hisamitsu Yamazoe

Ichita Sogabe

Takasi Hachiga

Hisami Mitsueda

Matsuju Yoshida

A map of an entire region is divided into sections of a square of 900', each of which is further divided into blocks of a square of 30', each of which is further divided into units of a square of 1', so that a region on the map can be hierarchically designated. Each section is defined with section codes of three figures; each block is defined with block codes of three figures in accordance with its relative positional relation in the section; and each unit is defined with unit codes of three figures in accordance with its relative positional relation in the block, so that each unit can be completely differentiated with an intrinsic code of nine figures composed of those three kinds of codes. As to the section code composing the intrinsic code corresponding to the predetermined region, moreover, a number of significant digits is reduced by assigning a lower number in the code system, so that the manual operations of inputting the intrinsic code of the predetermined region can be lightened.

System and method for designating points on a map using reduced

In an input buffer circuit arrangement, a comparator compares a filtered input signal applied to one input with each of a first and a second reference value preset at the other input by a first setting circuit to produce a comparison output signal. According to the comparison output signal, a second setting circuit provides a third and a fourth reference value to one input of the comparator to obtain a noise-resistive characteristic.

Input buffer circuit

In a closed loop idle engine speed control system the actual engine speed is compared with a reference idle speed during engine warm-up periods to control the amount of an air flow introduced to the engine through an auxiliary air delivery system so that the difference between the actual and reference engine speeds is reduced. The reference setting of the idle speed is varied as a function of the engine temperature in order to vary the actual engine speed in response to an increase in the engine temperature. The auxiliary air delivery system includes a linear solenoid type electromagnetic valve which comprises a spring-biased valve member normally maintained in a neutral position with respect to the valve seat to allow introduction of a predetermined amount of auxiliary air to the engine and a pair of coils energized respectively with a current representing the difference in engine speed to move the valve member in opposite directions to increase or decrease the auxiliary air supply.

Closed loop idle engine speed control with a valve operating relative to

In a method of computing and controlling the fuel injection quantity of a fuel injection system and the ignition timing of an ignition system of an international combustion engine by a microcomputer in accordance with operating conditions of the engine, a discrimination signal indicative of the presence or absence of misfiring is generated in accordance with an electric signal from the ignition system so that when misfiring occurs, even if fuel injection quantity data has already been computed, data for reducing the fuel injection quantity to zero is generated in response to the discrimination signal to stop fuel injection.

Fuel injection control method for internal combustion engines

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Nagoya, Japan

Kazuyoshi Tamaki