Toyota Jidosha Kabushiki Kaisha

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Toyota Jidosha Kaisha

Koichiro Nakatani

Shinya Hirota

Kazuhiro Itoh

Koichi Kimura

Toshiaki Tanaka

Takamitsu Asanuma

Shunsuke Toshioka

Akira Mikami

Tomoyuki Kogo

Shinobu Ishiyama

Tomoyuki Ono

Terutoshi Tomoda

Katsuhiro Ito

Yoshihiro Hisataka

Akira Yamashita

Michio Furuhashi

Yasuaki Nakano

Yoshimitsu Henda

Masayoshi Nakagawa

Kiyoshi Nakanishi

Naofumi Magarida

Kotaro Hayashi

Takanori Ueda

Takekazu Ito

Masato Gotoh

Fumiaki Hattori

Hisashi Ohki

Takenori Saoda

Shigeki Daido

Naohisa Oyama

Yukihiro Tsukasaki

Kazuhiro Mori

Hiroyuki Tominaga

Souichi Matushita

Shuji Watanabe

Haruo Ooishi

A flow rate controller of an internal combustion engine includes a flow rate change section configured by including an EGR valve, a bypass valve, and a diesel throttle, as the flow rate change section capable of changing at least one of a flow rate of exhaust gas that is recirculated to an intake system from an exhaust system of an internal combustion engine via an EGR passage and a flow rate of fresh air that flows into the internal combustion engine. In addition, an ECU is included to realize: an arrival position determining section for determining an arrival position of condensed water in the EGR passage that is moved by the EGR at least either at the time of acceleration or at the time of deceleration of the internal combustion engine; and a control section for controlling the flow rate change section on the basis of the arrival position determined by the arrival position determining section.

Flow rate controller of internal combustion engine

An engine system includes: an exhaust path through which an exhaust gas of an engine passes; an urea injection valve that injects urea into the exhaust path; a catalyst that is provided in the exhaust path on a downstream of the urea injection valve, and that selectively reduces NOx by using ammonia acting as a reducing agent, the ammonia being generated by hydrolyzing injected urea from the urea injection valve; a heating portion that is capable of heating the catalyst and the injected urea; and a control unit that performs first control, in which the urea injection valve injects urea, the heating portion heats the injected urea to generate ammonia, or second control, in which the heating portion increases a temperature of the catalyst to a temperature at which NOx can be reduced, on a basis of an amount of ammonia adsorbed on the catalyst.

Engine system

The character or nature of cooling water is correctly estimated. A cooling system for an internal combustion engine includes a radiator, a bypass passage which bypasses the radiator, a thermostat, and a control unit which changes a valve opening temperature of the thermostat. The cooling system for the internal combustion engine further includes an estimating unit which forbids valve opening of the thermostat and which estimates the character of the cooling water on the basis of temperature transition of the cooling water provided in this state.

Cooling system for internal combustion engine

A control apparatus for an internal combustion engine includes phase change means () for advancing or retarding phases of an opening timing and a closing timing of an intake valve (); duration change means () for increasing or decreasing a duration of the intake valve (); and EGR gas amount increase means () for increasing an amount of EGR gas, based on an operating state of an internal combustion engine. The control apparatus further includes intake-valve closing timing advancing means () for advancing the intake-valve closing timing when the amount of EGR gas is increased. The intake-valve closing timing advancing means () advances the intake-valve closing timing by performing a first operation that advances the phases using the phase change means (), and performing a second operation that decreases the duration using the duration change means (), and makes a timing at which the second operation is started later than a timing at which the first operation is started.

Control apparatus and control method for internal combustion engine

Disclosed is a technology that enables better reduction of NOx stored in an NOx catalyst in an exhaust gas purification system for an internal combustion engine. When NOx stored in an NOx catalyst is to be reduced, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased to a target air-fuel ratio by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine. In doing so, if the temperature of the NOx catalyst is not lower than a specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased to the target air-fuel ratio while bringing the combustion state into low temperature combustion. On the other hand, if the temperature of the NOx catalyst is lower than the specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased to the target air-fuel ratio while decreasing the quantity of EGR gas in a cylinder so that the amount of generated smoke is kept within an allowable range.

Exhaust gas purification system for internal combustion engine

An object of the present invention is to provide a technology that enables reduction of NOx stored in an NOx catalyst with improved efficiency in an exhaust gas purification system for an internal combustion engine. According to the present invention, when NOx stored in the NOx catalyst is to be reduced, if the temperature of the NOx catalyst is lower than a specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased only by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine, and if the temperature of the NOx catalyst is not lower than the specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased either only by adding reducing agent through reducing agent addition means, or by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine and adding reducing agent through the reducing agent addition means.

A control apparatus for an internal combustion engine () includes intake valve control means (). The internal combustion engine () includes a variable intake valve operating mechanism () that changes a valve opening characteristic of an intake valve (), and rich combustion is performed in the internal combustion engine () to control an exhaust gas purification catalyst () disposed in an exhaust passage (). The intake valve control means () controls the valve opening characteristic of the intake valve () to increase a flow rate of intake air in an early stage of an intake stroke when the rich combustion is performed, as compared to when non-rich combustion is performed.

During a rich spike control for an exhaust gas purification system for an internal combustion engine, a base air-fuel ratio AFb is decreased in a range where a combustion variation &#x394;CC does not exceed a permissible limit &#x394;CCL (S). When the combustion variation &#x394;CC exceeds the permissible limit &#x394;CCL, the spike base air-fuel ratio AFbs is increased (S). When the torque decrease amount &#x394;TD is above the permissible value &#x394;TDL, the spike base air-fuel ratio AFbs is decreased (S). When the combustion variation &#x394;CC is above the permissible limit &#x394;CCL, and the torque decrease amount &#x394;TD is above the permissible value &#x394;TDL, the spike base air-fuel ratio AFbs is increased, and a fuel discharge time number EN is increased (S).

Exhaust gas purification system for internal combustion engine and control method for same

First, an amount of external EGR gas is adjusted so that an amount, by which an amount of internal EGR gas is adjusted, falls within a predetermined range (Sto S), and, then, the amount of internal EGR gas is adjusted when the amount, by which the amount of internal EGR gas is adjusted, falls within the predetermined range (Sto S) in order to execute a feedback control so that an EGR rate, which indicates a proportion of EGR gas including the external EGR gas and the internal EGR gas to intake air that is supplied to the internal combustion engine, matches a target EGR rate.

Exhaust gas recirculation system and exhaust gas recirculation method for internal combustion engine

A control apparatus for an internal combustion engine, which can generate exhaust pressure pulsation at an early period while suppressing the degradation of volumetric efficiency, when a request to enhance the exhaust pressure pulsation is made in the internal combustion engine which includes a variable valve mechanism that makes variable a valve overlap period, and a variable nozzle type turbocharger.

Control apparatus for internal combustion engine

An internal combustion engine control apparatus that prevents an abrupt change in the air amount at the time of supercharger switching. The control apparatus enters a small turbo operating state in which a small turbocharger is mainly operative, during relatively low-rotation-speed and low-load side, and enters a large turbo operating state in which a large turbocharger is mainly operative, in a relatively high-rotation-speed and high-load. In the small turbo operating state, the control apparatus can exercise charging efficiency enhancement control by using a scavenging effect. Before switching from the small turbo operating state to the large turbo operating state, the control apparatus predicts whether the large turbocharger will build up its boost pressure quickly or slowly. When slow boost pressure is predicted, the control apparatus exercises charging efficiency enhancement control to provide a low degree of charging efficiency enhancement.

In a device for controlling idling stop of an engine in which the idling stop is carried out when a temperature of the engine that is about to be stopped by the idling stop is higher than a threshold value, when the start improvement device does not function normally, the idling stop is prohibited regardless of engine temperature. Thus, the problem in which the engine cannot be restarted satisfactorily does not occur.

Vehicle having idling stop control and control methods thereof

An internal combustion engine with an exhaust gas purification device is provided in which the NOx held in a NOx catalyst can be efficiently reduced and purified, and a sufficient amount of NOx can be reduced, thereby making it possible to regenerate the NOx catalyst over a wide range thereof. When processing of releasing and reducing the NOx held in the NOx catalystfor purification, light oil is injected by an addition valveso as to be supplied to the NOx catalysttogether with the exhaust gas, and after the droplet-like light oil adheres to the entire area of the NOx catalyst, the flow rate of the exhaust gas is decreased.

Exhaust gas purification device for an internal combustion engine and exhaust gas purification method for an internal combustion engine

A main particulate filter having a relatively large volume is arranged in an exhaust passage of an engine, and an auxiliary particulate filter having a relatively small volume is arranged in the exhaust passage upstream of the main particulate filter. The main and auxiliary particulate filters are arranged so that the open downstream ends of the single open end-type exhaust gas passages of the auxiliary particulate filter and the open upstream ends of the open upstream end-type exhaust gas passages of the main particulate filter substantially face each other, and the open downstream ends of the both open end-type exhaust gas passages of the auxiliary particulate filter and the closed upstream ends of the open downstream end-type exhaust gas passages of the main particulate filter substantially face each other. A catalyst having an oxidation function is carried on the auxiliary particulate filter.

Exhaust gas purification device for engine

A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device includes a particulate filter arranged in the exhaust system, which carries a catalyst for absorbing and reducing NO. The catalyst absorbs NOwhen the air-fuel ratio in the surrounding atmosphere thereof is lean and releases the absorbed NOto purify NOby reduction when the air-fuel ratio is stoichiometric or rich. The device further includes a catalytic apparatus for purifying NOarranged in the exhaust system upstream of the particulate filter, which has an oxidation function.

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Mishima, Japan

Koichiro Nakatani