Nippon Soken, Inc.

Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Nippan Soken, Inc.

Hisasi Kawai

Tokio Kohama

Hideki Obayashi

Toshikazu Ina

Tsuneyuki Egami

Toshihiko Igashira

Seiji Morino

Norihito Tokura

Kazuhiro Sakurai

Takaharu Idogaki

Takeshi Matsui

Kyo Hattori

Hidetaka Nohira

Takashi Shigematsu

Kiyonori Sekiguchi

Toru Yoshinaga

Akira Nishimatsu

Kenzi Iwamoto

Kazuo Iwase

Kiyoshi Kobashi

Takeshi Tanaka

Norio Omori

Seiko Abe

Ikuo Hayashi

Hideya Fujisawa

Yutaka Kawashima

Ritsu Katsuoka

Yasuyuki Sakakibara

Kenji Kanehara

Masakazu Ninomiya

Yasuhiro Ikuta

Kouichi Mori

Koichi Moriguchi

Nobutaka Mizuno

Mitiyasu Moritugu

Daisaku Sawada

Setsuo Tokoro

Shunzo Yamaguchi

Ken Nomura

Kunimasa Yoshimura

Syuzaburou Tashiro

Ryuichi Matushiro

Norihiko Nakamura

Muneaki Matsumoto

Masaaki Tanaka

Kimitaka Saito

Toshimitsu Ito

Masahiro Goto

Seizi Huzino

Michio Kawagoe

Akihiro Izawa

Mitsumasa Yamada

Naoki Umeda

Akira Fukami

Yoshiyasu Ito

Michihiro Ohashi

Yasuhiko Ishida

Masakatsu Sanada

Hisashi Ohki

Minoru Iwata

Eiji Hashimoto

Tsutomu Saito

Masayoshi Tokoro

Tooru Kosuda

Osamu Nakano

Takao Komoda

Mitsuyuki Ugajin

Makoto Kuroyanagi

Hiroshi Hamaguchi

Masakazu Yoshida

Makio Hamanishi

Syuzaburo Tashiro

Hitoshi Kanmura

Kazutaka Hasegawa

Takayoshi Ito

Mitiaki Ujihashi

Souichi Matsusita

Takaharu Odogaki

Masato Soumiya

Hiroshi Sada

An electrostrictive actuator which can be used, e.g., in a distributor type fuel injection device of a diesel engine has an electrostrictive actuator for generating an electric charge upon reception of a load and an electric circuit unit connected to the electrostrictive actuator. The electric circuit unit has an electric charge changing means for changing the electric charge of the electrostrictive actuator in the state of generation of electric charge due to a load exerted on the electrostrictive actuator and thereby constricting the electrostrictive actuator, and an electrical charging means for charging the electrostrictive actuator in the state of constriction due to the operation of the electric charge changing means when the load exerted on the electrostrictive actuator is reduced and thereby extending the electrostrictive actuator.

Electrostrictive actuator device and fuel injection device using same

A road surface detecting device has a rotary sensor for detecting the passage of teeth formed in an outer surface of a circular plate at regular intervals, which is connected to an axle of a vehicle and rotates thereabout, and generates an output signal pulsing every time when said teeth pass the rotary sensor. The output signal is inputted to a microcomputer. The microcomputer calculates period variations of the pulsing output signal and an average value of a predetermined number of the period variations. When the average value is not less than a predetermined value, the road surface is determined as being in a bad condition and when the average value is less than the predetermined value, the road surface is determined as being in a good condition; when the average value is less than the predetermined value and the most recently calculating period variation is not less than a predetermined period variation, the road surface is determined as being a rough area on a good road.

Road surface detecting device for vehicle

A road surface detecting device has a circular plate connected with an axle of a vehicle so as to be rotated with said axle, and has a large number of teeth at regular intervals in its outer periphery. A rotary sensor detecting the passage of the teeth of the circular plate, and generates a pulse signal, and a microcomputer receive the pulse signal. The microcomputer calculates instantaneous speeds of a wheel from the period of the pulse signal and calculates an average value of a plurality of instantaneous speeds obtained in the predetermined rotations of a wheel another average value of a plurality of instantaneous speeds obtained in the next predetermined rotations of a wheel is also calculated as a presumed speed of a vehicle based on one and another average values. The microcomputer then calculates an absolute value of a difference between the instantaneous speeds in the predetermined rotations after next of a wheel and the presumed speed of vehicle, cancels an absolute value of an oldest difference every time when an absolute value of a newest difference is obtained, and calculates a successive integrated value by adding absolute values of a predetermined number of differences to one another. The microcomputer determines the road surface condition to be a bad condition when the successive integrated value is not less than a predetermined value or as a good condition when the successive integrated value is not more than the predetermined value.

Road surface detecting device

In an apparatus for detecting abnormal variation of wheels of a vehicle, a plurality of rotation sensors detect variations in rotation speeds of a plurality of wheels during running of the vehicle. Detection signals produced from the plurality of rotation sensors are converted into arithmetic operation signals by means of a signal converter. An arithmetic operation processor is responsive to the arithmetic operation signals from the signal converter to compute rates of variations in the rotation speeds. The arithmetic operation processor also compares the computed rates of variations with each other to decide whether wheels exist which have a rate of variation abnormally deviating from rates of variations of the other wheels. An alarm unit is responsive to decision signals from the arithmetic operation processor to alert abnormality of the wheels having the abnormally deviating variation rate.

Apparatus for detecting abnormal variations of wheels of vehicle

A drive circuit for an electrostrictive element actuator for a fuel injection apparatus of a diesel engine. The drive circuit has a condenser adapted to be charged with electric charges generated by the electrostrictive element actuator; a combination of an electric charge transferring switching element and a rectifier element for becoming conductive in a first period and charging electric charges generated by the electrostrictive element actuator to the condenser; and a combination of an electric charge returning switching element and a rectifier element for becoming conductive in a second period, other than the first period, and returning electric charges stored in the condenser to the electrostrictive element actuator.

Drive circuit of electrostrictive element actuator in diesel engine fuel

The flow rate of intake air in an engine, engine speed, and automobile speed are detected. The speed-change ratio of a transmission is determined and adjusted in response to a signal which is proportional to the detected intake air flow rate and inversely proportional to the detected engine speed, and in response to the detected automobile speed.

Automatic transmission control system for an automobile

Disclosed is a local area network for a vehicle which comprises a plurality of terminal stations each having an input/output port for various signals, a main-loop formed by series connection of the terminal stations and transmission lines, a sub-loop arranged in parallel to the main-loop and formed by series connection of the terminal stations and transmission lines, and controllers. One of the terminal stations receives a large amount of information such as an audio signal from an audio transmitter and one of the other terminal stations supplies a large amount of information such as an audio signal to an audio receiver. When the main-loop is in a normal operation state, the main-loop operates as a token-passing system and the sub-loop acts as a direct transmission route from one of the terminal stations to another terminal station, and when the main-loop is in an abnormal operation state, the main-loop is coupled with the sub-loop and the transmitting of information such as an audio signal is stopped, and simultaneously, the sub-loop is switched to the token-passing system. Thus, the double loops, i.e., the main-loop and the sub-loop, are effectively utilized. In addition, any decrease in the reliability of various signals transmission when a failure of the main-loop occurs, can be prevented.

Local area network for vehicle

In an ignition device for an internal combustion engine, the ignition device comprises: three closed circuits including first, second and third closed circuits, each circuit having at least a DC power source, a primary coil and a switching transistor; an ignition coil having three primary coils and a secondary coil; an ignition command signal generating means producing first and second ignition command signals, the first ignition command signal being applied to the third closed circuit and the second ignition command signal being applied to the control circuit; and a control circuit for causing the first and second switching elements to push-pull operate based on the input timing of the second ignition command signal.

Ignition device for an internal combustion engine

A device for measuring the flow rate of air includes an electric heater arranged in a path of the air flow and a temperature compensation resistor arranged at a distance from the heater in the path of the air flow, the resistance of the resistor being changed according to the temperature of the air. A selective current supply unit supplied the heater with a current having a current value selected from one of two, large and small, current values. A temperature selection unit selects a plurality of temperature values of the electric heater according to the change of the resistance of the temperature compensation resistor. A current value switching unit switches the current level of the selective current supply under the condition that one of the selected temperature values is attained or maintained. The flow rate of the air is measured by a time measurement unit for measuring the time required for the change of temperature between the plurality of temperature values due to the change of the temperature of the electric heater caused by the switching by the current value switching unit.

Device for measuring flow rate of air

In an internal combustion engine, a plurality of engine rotational speeds are detected at predetermined timings for every firing stroke in one cylinder of the engine, and an engine speed variation is calculated as a variation between the square of one of the engine rotational speed and the square of another of the engine rotational speed. A process is performed upon the sequence of the engine speed variations, thus determining an engine combustion state by the processed result.

Method and apparatus for detecting combustion variations in internal

A displacement sensor is provided with first and second piezoelectric elements, a pair of electrodes at one and the other ends of each of the first and the second piezoelectric elements; a permanent magnet mechanically fixed to one end of the first piezoelectric element; a small piece mechanically fixed to one end of the second piezoelectric element and having almost the same weight as that of the permanent magnet; and a base plate to which the other ends of the first and the second piezoelectric elements are mechanically fixed; wherein the electrodes provided at the other end of each of the first and the second piezoelectric elements are electrically connected, and the electrodes provided at one end of each of the first and the second piezoelectric elements are used as output terminals. Also, a pair of small pieces made of a magnetic material and a non-magnetic material can be used instead of the above permanent magnet and small piece.

Displacement sensor including a magnetically responsive member and a

The apparatus includes an ignition instruction signal generating unit for repeatedly generating a first ignition instruction signal instructing an AC discharging duration and a second ignition instruction signal instructing the current flow time of a first primary coil at each ignition timing; and an ignition control circuit unit for causing the first and second switching elements to perform a push-pull operation for a predetermined period of time upon reception of a given ignition instruction signal. When it is detected from a current detection signal from the current detection element upon reception of the first ignition instruction signal that the current of one of the first and second closed circuits has reached a predetermined value, a signal for turning OFF the one of the first and second closed circuits is supplied to one of the first and second switching elements and a signal for turning ON the other closed circuit is supplied to the other switching element so as to enable the push-pull operation of the switching elements. Accordingly, one of the switching elements is turned ON in response to the second ignition instruction signal for the current flow time of the primary thereby, and is then turned OFF. Thus, an ignition timing can be determined precisely, and a sufficiently high voltage can be obtained.

Apparatus for controlling ignition in internal combustion engine

An electromagnetic rotary driving device including a rotor of a permanent magnet arranged in a hole formed in a bored stator core block of a stator core, made from magnetic material. The air gap formed between the bored block of the stator core and the rotor in the direction parallel with the magnetic path in the stator core is relatively long, while the air gap formed between the bored block of the stator core and the rotor in the direction perpendicular to the magnetic path in the stator core is relatively short. In this device, the angle of rotation of the rotor is continuously changed by the current flowing through the coil of the stator without requiring a spring for return motion.

Electromagnetic rotary driving device

A rotary drive apparatus includes: a bar yoke, a coil mounted on the bar yoke, and a cylindrical case, having a magnetic property for receiving the coil and the bar yoke therein. The cylindrical case has at least one salient-pole portion formed on the inside thereof in the vicinity of a portion where the coil is received. The rotary drive apparatus also includes a rotary member facing the salient-pole portion and spaced from the bar yoke and the salient-pole portion by a predetermined gap, so that the rotary member rotates between the bar yoke and the salient-pole portion, and is provided with at least one magnet having opposite magnetic polarities and arranged along the circumference of the rotary member and facing the salient-pole portion. The salient-pole portion, the magnet, and an end-of-the-yoke member form a magnetic circuit. The rotary member is rotated in response to magnetic flux generated at the end of the bar yoke by applying an electric current to the coil.

Electric rotary drive apparatus operable in a magnetic cylinder

Growing community of inventors

Toyohashi, Japan

Hisasi Kawai