Toyota Jidosha Kogyo Kabushiki Kaisha

Nippondenso Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Mitsuo Kawai

Nobuyuki Kobayashi

Keiji Aoki

Tokuta Inoue

Shinji Ikeda

Mamoru Kobashi

Masaomi Nagase

Toshimitsu Sakai

Hironobu Ono

Haruo Watanabe

Kunio Endo

Kohichi Hasegawa

Kiyohumi Mizuno

Masahiko Miyahara

Mamoru Takata

Shigehiko Ito

Yoshikazu Motogami

Hisashi Matsumoto

Hiroyuki Hoshiba

A combustion process sensor for detecting combustion processes occurring in a combustion chamber of an engine has a generally tubular mounting casing to be screwed into a threaded hole in the combustion chamber wall and a quartz-glass rod axially extending in the mounting casing and held in position therein. The casing includes two axially aligned generally tubular members rigidly secured together at their own ends. The quartz-glass rod has a first portion remote from a sensing end thereof adapted to be exposed to combustion flame in the combustion chamber, and a second portion between the first portion and the sensing end. The first portion is secured to one of the two tubular members of the casing, while the second portion is supported from the casing only by a vibration damping material disposed in engagement with the outer peripheral surface of the quartz-glass rod and the inner peripheral surface of the casing.

Combustion process sensor

An apparatus for diagnosing a malfunction of an electronic control system including sensors for electrically sensing conditions of sensing points of a vehicle and an electronic calculation unit for determining an energizing condition of an actuator for controlling a vehicle operation in accordance with output signals from the sensors is disclosed. The malfunction diagnosing apparatus is inserted intermediate of wires which connect the sensors or the actuator and the electronic control system, and when a voltage or current level on any wire assumes a non-steady state, the malfunction diagnosing apparatus determines that a malfunction has occurred at a portion associated with that wire and memorizes and holds the occurrence of the malfunction.

Malfunction diagnosing apparatus for electronic control system for

Disclosed is a basic air-fuel ratio adjustment method and an apparatus for an internal combustion engine. The adjustment of the basic air-fuel ratio is performed by measuring a signal level corresponding to the level of an air-fuel ratio compensation signal of the engine while the feedback control operation for compensating an error of the air-fuel ratio of the engine is being stopped, by measuring the average level of the air-fuel ratio compensation signal when the feedback control is in operation, and by adjusting the means for presetting the basic air-fuel ratio of the air-fuel mixture fed into the engine so that the difference between the measured signal level and the measured average signal level becomes equal to a predetermined value. Thus, the adjustment of the basic air-fuel ratio can be very easily performed. Furthermore, a high accuracy of the adjustment can be easily obtained.

Basic air-fuel ratio adjustment method and apparatus

An oxygen detector of the type having a tubular ceramic or zirconia electrode covered with a very thin platinum layer and a cylindrical protective cover for the electrode, the cover having a plurality of small openings arranged in its cylindrical wall to be substantially more dense on one side thereof than on the diametrically opposite side thereof, the detector being adapted to be positively mounted to make the aforementioned opposite side face upstream of the gas stream in which the detector is positioned.

Oxygen detector

A control system for a power dividing type hydraulic transmission in which the motive power supplied from an engine is transmitted mechanically. Part of the motive power is converted to hydraulic power by hydraulic pump motors to obtain infinitely variable speed ratios. The transmission includes a hydraulic pressure control system that operates by the use of electrically controlled solenoid valves. The control system detects the rotational speeds of an input and an output shaft, and when the speed ratio between the shafts is smaller than the mode converting speed ratio, a first solenoid valve is operated to engage a first clutch. When the speed ratio is greater than the mode converting speed ratio, a second solenoid valve is operated to engage a second clutch. The engagement of the clutches is timed so that both clutches are not coincidentally disengaged.

Hydraulic transmission control device

An improved fuel control apparatus for installation on an automobile engine equipped with an electronically controlled fuel injection system and a catalytic exhaust gas purifying system to prevent excess uncombusted fuel from being carried over into the catalytic purifier and burning therein with a resultant damage thereto. The apparatus essentially comprises a plurality of solenoid valves each associated with one of a plurality of fuel injection nozzles, a device for alternately energizing the solenoid valves to close to selectively stop the supply of fuel to one of the fuel injection nozzles upon elevation of the purifier temperature above a predetermined level, and a device for detecting the temperature of the catalytic purifier and transmitting only in case of elevation of the purifier temperature above a predetermined level a signal which enables the solenoid valve energizing device to function.

Fuel control apparatus for an automobile engine equipped with an

There is provided an electronically controlled fuel injection system comprising a temperature fuel enrichment circuit for generating, in accordance with the output signal of an internal combustion engine temperature sensor, an output signal corresponding to a temperature fuel enrichment characteristic to provide the required fuel enrichment for cold operation, and fuel injection means for injecting an increased quantity of fuel in accordance with the output signal of the temperature fuel enrichment circuit. The system is additionally provided with a revolution compensation circuit for generating a revolution signal corresponding to the number of engine revolutions per minute for continuously decreasing the temperature fuel enrichment characteristic of the temperature fuel enrichment circuit in accordance with increase in the number of engine revolutions per minute. In this way, an improved fuel consumption characteristic is ensured during the warmup period and the underfeeding of fuel under the idling operation is eliminated, and moreover the fuel enrichment is smoothly accomplished to suit changes in the driving conditions of the vehicle.

Electronically controlled fuel injection system

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Toyota, Japan

Mitsuo Kawai