Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Nippondenso Co., Ltd.

Nippon Soken, Inc.

Norio Shibata

Kenji Goto

Yukihide Hashiguchi

Nobuki Uchitani

Mamoru Yoshioka

Shigeo Hayashi

Takashi Kato

Naoji Sakakibara

Nobuyuki Hashimoto

Kenichi Harada

Kouichi Osawa

Hidemi Ohnaka

Shinichi Abe

Hideaki Mizuno

Yasuo Takahara

Tatsumi Furukubo

Tatsuyoshi Kamohara

Kouichi Satoya

Shizuo Yamada

Ken Mifuji

An irregular combustion determining device comprising a variation detecting unit, a first determining unit, and a second determining unit. The variation detecting unit detects a variation in an engine speed on the basis of two successive engine speed detected at predetermined crank angles. The first determining unit determines that an irregular combustion has occurred when the variation in the engine speed detected by the variation detecting unit is larger than a predetermined first variation in the engine speed. When the first determining unit determines that an irregular combustion has occurred, at the next detection of the variation in the engine speed by the variation detecting unit, the second determining unit determines that an irregular combustion has occurred when the variation in the engine speed detected by the variation detecting unit is larger than the predetermined second variation in the engine speed which is smaller than the predetermined first variation in the engine speed.

Irregular combustion determining device for an internal combustion engine

A diagnosis device for an exhaust gas recycling device diagnoses whether or not an exhaust gas recycling device is operating normally; the temperature of an exhaust gas recycling passage is detected by a temperature detection means, a decision is made by an exhaust gas recycling operating region detection means whether or not the operating region is such as to carry out exhaust gas recycling, when a decision is made that the operating region is such as to carry out exhaust gas recycling a counter is incremented and when otherwise is decremented, and a decision that the exhaust gas recycling is not being carried out normally, that is that the exhaust gas recycling device has failed, is made when the count value of this counter is at least a certain value and the temperature of the exhaust gas recycling passage is not more than a certain value.

Diagnosis device for exhaust gas recycling device of internal combustion

A diagnosing apparatus for diagnosing first and second vacuum switches and a throttle switch of an exhaust gas purification apparatus. The diagnosing apparatus includes first and second vacuum switches, a throttle switch, an engine speed sensor, and a computer. The second vacuum switch outputs a signal when the value of vacuum is greater than 80 mm Hg vacuum. The second vacuum switch outputs a signal when the value of vacuum is less than 350 mm Hg vacuum. The throttle switch outputs a signal when the throttle valve is open more than 9 degrees. The engine speed sensor detects an engine revolution number. A predetermined relationship is stored in the computer of the diagnosing apparatus and the relationship includes at least three ranges or areas. The computer determines whether the detected engine revolution number is within a first range when the output of the second vacuum switch is contrary to an output forecasted or predicted in accordance with the outputs of the first vacuum switch and the throttle switch on the basis of the predetermined relationship, whereby the diagnosing apparatus does not diagnose any of switches as out of order when the engine revolution number is within the first or range.

Apparatus and a method for diagnosing an exhaust gas purification system

In an internal combustion engine having a carburetor fuel system wherein an amount of air bleeding is mixed with the fuel by a feedback control for adjusting an air-fuel ratio, the amount of air bleeding is regulated within a range defined by a minimum guard value and a maximum guard value, the maximum guard value is adjusted to a smaller value than the maximum guard value, and the feedback control is not interrupted when the engine is cold, the engine is in an acceleration state, and the air fuel ratio is lean.

Method and apparatus for controlling air-fuel ratio in internal

An internal combustion engine provided with a device for cutting fuel during deceleration and a purge system for selectively opening and closing a fuel passageway from a charcoal canister to an intake system of the engine in accordance with the operating condition of the engine. The purge system is operated so that the passageway is closed when the fuel is cut, and the purge system is operated so that the passageway is opened and closed in accordance with the operating condition of the engine when the engine is in a deceleration condition other than the particular condition where the fuel is cut.

System for controlling vaporized fuel in an internal combustion engine

A secondary air supply device for introducing, by utilizing the exhaust gas pulsations, a flow of secondary air into the exhaust gas to after-burn the unburned combustibles comprises a secondary air supply conduit including an inlet section having a reduced flow area and an exit section having an enlarged flow area. This enables an increase of the frequency of resonance of the secondary air supply conduit without reducing the length thereof, so that the amplitude of the pressure pulsation in the secondary air supply conduit is extended to cause the pressure pulsation to occur at least in part in the negative pressure range at a high engine speed, thereby assuring the supply of secondary air even during the high speed operating condition of the engine.

Secondary air supply device for an internal combustion engine exhaust

An exhaust gas recirculation system for an internal combustion engine in which an exhaust gas control valve and a pressure regulating valve is constructed as one body to facilitate the mounting of the system on the engine and to improve the response characteristic of the system. Also, the chamber of the pressure regulating valve opposite to the chamber for receiving the exhaust gas is subjected to a pressure which is controlled in corresponding to the state of engine operation such as load, engine speed or the like, so that the rate of the exhaust gas recirculation is controlled in accordance with the state of engine operation.

Exhaust gas recirculation system

Disclosed is an internal combustion engine having a charcoal canister. The float chamber of the carburetor is connected to the canister via an evaporated fuel vapor passage. The carburetor has therein a slow fuel passage connected to the slow port which opens into the intake passage of the engine. The slow fuel passage is opened and, at the same time, the evaporated fuel vapor passage is closed by means of a single electromagnetic valve when the ignition switch is turned to the ON condition.

Evaporated fuel vapor control device for use in an internal combustion

Disclosed is a secondary air control device disposed in a system for supplying secondary air into an exhaust system of an internal combustion engine for purifying exhaust gas emitted from the engine. The secondary air control device comprises a first valve device actuated by an ON-OFF vacuum signal for stepwisely controlling the flow of secondary air in response to the ON-OFF vacuum signal, and; a second valve device, which is a delay system with a predetermined delay time, actuated by the ON-OFF vacuum signal for controlling the flow of secondary air. Accordingly, the secondary air control device can control the flow of secondary air, which comprises a step flow generated by the first valve device, and a delayed flow generated by the second valve device, in accordance with the ON-OFF vacuum signal.

Secondary air control valve device

An electrothermally operated valve which comprises a housing provided thereon with first and second ports and with a hermetic chamber in communication with the respective ports, a bimetallic element having a stationary end secured to an inner wall of the housing and a movable end, a cut-off valve including a valve body fixed on the movable end of the bimetallic element to co-operate with one of the first and second ports, and a heating coil coupled with the bimetallic element and adapted to be connected with a source of electricity. When the bimetallic element is heated upon energization of the heating coil, deflection of the bimetallic element is assisted by snap action to open the cut-off valve so as to communicate the first and second ports to each other through the hermetic chamber.

Electrothermally operated valve

Disclosed is a secondary air control valve device for feeding secondary air controlled in correspondence with the engine load into an exhaust system having a catalytic converter for reducing hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NO.sub.x) contained in exhaust gas emitted from an internal combustion engine. The device is simple in construction and can vary the predetermined amount of secondary air in correspondence with the changes of the characteristic of the catalyzer which may vary as the catalyzer is activated, so that the amount of the secondary air is controlled for maintaining the highest converting efficiency for a long duration of use of the vehicle which has this device mounted thereon.

A system for supplying secondary air into the exhaust system of internal combustion engines having in combination two parallel systems, one feeding air depending upon exhaust gas pressure pulsation and the other feeding air depending upon intake vacuum pulsation.

Secondary air supply system for internal combustion engines

A non-return air flow system for supplying secondary air into the exhaust system of internal combustion engines by utilizing pulsating flow of exhaust gases in the exhaust system, wherein the critical valve opening pressure for a check valve incorporated in the non-return system is varied in accordance with intake air flow rate of the engine so that supply of secondary air is effected in proportion to air intake of the engine.

A flow rate control mechanism for use in controlling the flow rate of exhaust gases in an exhaust gas re-circulating system of an internal combustion engine. This mechanism includes a swirl flow chamber having a circular cross section, a first nozzle and a second nozzle, the former of which is open through the inner wall of the swirl flow chamber therein in the direction normal thereto and the latter of which is open through inner wall of the swirl flow chamber therein in the direction tangential thereto. The latter nozzle is positioned close to the opening of the former or first nozzle. The first nozzle directed in the normal direction extracts part of exhaust gases through an exhaust manifold, while the second nozzle directed in the tangential direction is communicated with atmosphere. The opening of the first nozzle is close to the opening of the second nozzle, so that the pressure at the opening of the first nozzle approximates the atmospheric pressure. As a result, the flow rate of exhaust gases which having been extracted through the exhaust manifold and fed into the flow rate control mechanism will be proportional to the square root of the exhaust gas pressure. On the other hand, the flow rate of intake air will be proportional to the square root of the exhaust gas pressure. Thus, the exhaust gases at a flow rate proportional to that of intake air is introduced into the swirl flow chamber, so that the both gases are mixed therein and fed into an intake manifold.

Flow rate control mechanism for use in exhaust gas re-circulating system

An improved air flow direction control valve particularly adapted for use with an exhaust gas purifying system on an internal combustion engine to control the direction of flow of air to be mixed into exhaust gas for effecting additional combustion of the uncombusted constituents therein. The valve essentially comprises a pair of valve members selectively operable to open one of two main outlets and a diaphragm operated shaft for selectively operating the two valve members upon movement between a first and a second position. The shaft is formed with a pair of shoulders which define a reduced diameter shaft portion therebetween, and the two valve members encircle the reduced diameter shaft portion in an oppositely facing relation. The reduced diameter shaft portion is slidable relative to the two valve members and upon movement of the shaft axially into its first position, one of the shoulders thereof is engageable with the first valve member to open the first main outlet, while the other shoulder is engageable with the second valve member to open the second main outlet upon movement of the shaft into its second position. At least one coil spring is provided for urging either of the valve members not engaged by the corresponding shaft shoulder, into a position to keep the corresponding valve outlet closed. The valve further includes a third valve member which is resiliently supported to close an auxiliary valve outlet. According to one embodiment of the invention, the third valve member is operated independently of the shaft, while according to another embodiment, it is operationally associated with the shaft.

Growing community of inventors

Susono, Japan

Norio Shibata