Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Jidoshokki

Denso Corporation

Koichiro Fukuda

Shunsuke Toshioka

Shinya Hirota

Kazuhiro Itoh

Yuki Bisaiji

Akira Mikami

Sakutaro Hoshi

Mikio Inoue

Takafumi Yamauchi

Taro Aoyama

Kingo Suyama

Shigeki Nakayama

Makoto Koike

Kenji Furui

Ryoichi Hibino

Satoshi Watanabe

Matsuei Ueda

Masatoshi Maruyama

Masakazu Sakata

Noriyoshi Takahashi

Takashi Endo

Atsushi Kidokoro

Takanori Nakano

Haruyuki Katayama

Kiyohiko Nagae

Akira Shichi

Ryosuke Kayanuma

Akihiko Asano

Satoru Nitta

In a hybrid vehicle, suppression of an amount of fuel consumed for reducing NOx stored in an NSR catalyst and suppression of deterioration in exhaust gas components due to unreacted fuel flowing out from the NSR catalyst are made compatible with each other. Predetermined power source control is carried out in accompany with the execution of NOx reduction processing to supply fuel to the NSR catalyst. In the predetermined power source control, an engine rotation speed of an internal combustion engine is made to decrease or an operation of the internal combustion engine is made to stop, and an electric motor is controlled so as to compensate for required torque. Further, during a period of execution of the predetermined power source control, a lower limit value of a predetermined target SOC range for an SOC of a battery is changed to a value smaller than at times other than the period of execution of the predetermined power source control.

Exhaust gas purification system for a hybrid vehicle

An exhaust purification system of an internal combustion engine includes a catalyst arranged in an exhaust passage of the internal combustion engine and able to store oxygen, a storage amount calculating part configured to calculate an oxygen storage amount of the catalyst, a poisoning amount calculating part configured to calculate a poisoning amount of the catalyst, and an oxygen amount control part configured to control an amount of oxygen supplied to the catalyst based on the oxygen storage amount and the poisoning amount.

Exhaust purification system of internal combustion engine

An exhaust gas control apparatus includes a control device controlling a urea addition valve for adding urea from an upstream side of a NOx reduction catalyst. The control device obtains an ammonia adsorption amount distribution through the NOx reduction catalyst. When an ammonia adsorption amount in a predetermined part on a downstream side equals or exceeds a predetermined threshold, the control device controls the urea addition valve to stop the urea supply or reduce the amount thereof. The urea addition valve is controlled based on an adsorption amount distribution obtained from a model on which the catalyst is divided into cells such that an ammonia adsorption amount in a first cell positioned furthest upstream equals or exceeds a predetermined threshold close to a saturation adsorption amount and an ammonia adsorption amount in a second cell positioned downstream of the first cell reaches a predetermined target value smaller than the threshold.

Exhaust gas control apparatus and control method for exhaust gas control apparatus

The purpose of the present invention is to suppress degradation of a PM sensor and a decrease in detection accuracy of the amount of PM in a configuration in which a urea addition unit and a selective reduction-type NOx catalyst (NOx catalyst) are provided downstream of a particulate filter (filter) in an internal combustion engine exhaust passage, the PM sensor being disposed downstream of the filter. According to the present invention, in an exhaust passage () of an internal combustion engine (), a first NOx catalyst () and a second NOx catalyst () are disposed downstream of a filter () successively from the upstream side along the flow of exhaust. A urea addition unit () is disposed between the filter () and the first NOx catalyst (). A PM sensor () is disposed between the first NOx catalyst () and the second NOx catalyst ().

Exhaust gas control apparatus for internal combustion engine

An exhaust gas purification system is equipped with a burner in an exhaust passage upstream of an exhaust gas purification apparatus and having a burner combustion chamber in which flame is produced. When the temperature of the exhaust gas purification apparatus is raised, the burner produces flame that extends from the interior of the burner combustion chamber to the interior of the exhaust passage when the flow rate of the exhaust gas is not higher than a predetermined flow rate, and the burner causes the size of the flame to be smaller than when it is determined that the flow rate of the exhaust gas is not higher than the predetermined flow rate or to produce flame only in the interior of the burner combustion chamber when it is determined that the flow rate of exhaust gas is higher than the predetermined flow rate.

Exhaust gas purification system for internal combustion engine

To homogeneously diffuse, in the exhaust gas, an additive that is fed into a device for purifying exhaust gas of an internal combustion engine. An upstream device for purifying exhaust gas and a downstream device for purifying exhaust gas are connected together through an exhaust pipe having a sectional area smaller than that of the upstream device for purifying exhaust gas and that of the downstream device for purifying exhaust gas, a connection passage portion is provided to connect the exhaust outlet of a catalyst in the upstream device for purifying exhaust gas to the exhaust pipe, the connection passage portion being so formed that the center axis of the upstream device for purifying exhaust gas in the direction in which the exhaust gas flows is not aligned with the center axis of the exhaust pipe in the direction in which the exhaust gas flows, injection means is arranged in the connection passage portion to inject the additive into the exhaust passage so that the additive arrives at the opposing wall surface of the connection passage portion.

Device for purifying exhaust gas of an internal combustion engine

An exhaust gas purification device for an internal combustion engine purifies exhaust gas in a first exhaust path and a second exhaust path. The device includes a confluent path. The confluent path extends from a confluent section of the first exhaust path and the second exhaust path. A first auxiliary NOx catalyst is provided in the first exhaust path. A second auxiliary NOx catalyst is provided in the second exhaust path. A main NOx catalyst is provided in the confluent path. A first addition section adds an ammonia source in a first addition amount to a section upstream of the first auxiliary NOx catalyst to supply urea water to the first auxiliary NOx catalyst. A second addition section adds an ammonia source in a second addition amount to a section upstream of the second auxiliary NOx catalyst to supply urea water to the second auxiliary NOx catalyst.

Exhaust gas purification device for internal combustion engine

An object of the present invention is to increase the flexibility in the layout of an exhaust gas purification system for an internal combustion engine including selective catalytic reduction catalyst provided in an exhaust passage of the internal combustion engine and an addition device for supplying reducing agent derived from ammonia to the selective catalytic reduction catalyst, without a deterioration of the performance in reducing nitrogen oxides. To achieve the object, the exhaust gas purification system for an internal combustion engine according to the present invention is configured to supply hydrocarbon at the same time when reducing agent derived from ammonia is supplied to the selective catalytic reduction catalyst, thereby producing reducing agent that is hard to be oxidized by a precious metal catalyst.

An exhaust emission purifier is provided and able to suppress overheating of an exhaust emission purifying catalyst and execute fuel addition promptly when fuel addition to the exhaust emission purifying catalyst is requested. In the exhaust emission purifier of an internal combustion engine, exhaust purifying cycles are repeated in order that the exhaust emission purifying catalyst is to be regulated at a target temperature, the cycle being a combination of an addition period during which fuel is added from the fuel addition valve and a halt period during which fuel addition is halted, and the fuel addition valve is manipulated such that the halt period is disposed so as to sandwich the addition period in the cycle.

Fuel addition control method applied to exhaust emission purifier of internal combustion engine and exhaust emission purifier

Utilizing the finding that the state of adsorption of NHon a selective reduction type NOx catalyst includes a weakly adsorbed state in which the adsorbed NHis useful for a reduction reaction of NOx and a strongly adsorbed state in which the adsorbed NHis not useful for the reduction reaction of NOx unless the state of adsorption is changed into the weakly adsorbed state, the apparatus of the invention includes an actual weakly-adsorbed amount-calculation NHthat is adsorbed on the selective reduction type NOx catalyst in the weakly adsorbed state, and a dispensation control portion that performs a dispensation control of the reductant dispensed by a reductant-dispensation portion, according to the actual weakly adsorbed amount calculated by the actual weakly adsorbed amount calculation portion.

Exhaust gas control apparatus and reductant dispensing method for internal combustion engine

A technique that, in an exhaust gas purification apparatus of an internal combustion engine, can avoid a decrease in a NOx purification rate by adding a reducing agent as continuously as possible, while avoiding NHfrom passing through a selective reduction type NOx catalyst to a downstream side thereof. The selective reduction type NOx catalyst has an active spot which purifies NOx by the use of NH, and an adsorption site which adsorbs NH, wherein a vicinity site, which is located in the vicinity of the active spot, and a distant site, which is located distant from the active spot, exist in the adsorption site. The addition of the reducing agent from the reducing agent addition part is controlled based on the desorption rate of NHin the vicinity site so as to continue to cause the NHadsorbed to the vicinity site to exist.

Exhaust gas purification apparatus of an internal combustion engine

In an exhaust gas purification apparatus for an internal combustion engine, the regeneration of a filter and the purification of NOx are made compatible with each other while suppressing an excessive supply of HC. The apparatus includes a first exhaust gas purification unit for purifying NOx, a second exhaust gas purification unit arranged in series with the first exhaust gas purification unit for collecting PM, HC supply units for supplying HC to the first exhaust gas purification unit and the second exhaust gas purification unit, respectively, and a priority decision unit for deciding priority between supplying HC to the first exhaust gas purification unit and supplying HC to the second exhaust gas purification unit, wherein an amount of HC to be supplied to a lower priority one is made smaller when a request for supplying HC to the first exhaust gas purification unit and a request for supplying HC to the second exhaust gas purification unit overlap with each other than when the HC supplying requests do not overlap with each other.

Exhaust gas purification apparatus for internal combustion engine

An exhaust emission purifier able to suppress overheats of an exhaust emission purifying catalyst and execute fuel addition promptly when fuel addition to the exhaust emission purifying catalyst is requested is provided. In the exhaust emission purifier of an internal combustion engine including exhaust emission purifying catalyst of purifying exhaust emission of an internal combustion engine and a fuel addition valve of adding fuel from upstream of the exhaust emission purifying catalyst, cycles are repeated in order that the exhaust emission purifying catalyst is to be regulated at a target temperature, the cycle being a combination of an addition period during which fuel is added from the fuel addition valve and a halt period during which fuel addition is halted, and the fuel addition valve is manipulated such that the halt period is disposed so as to sandwich the addition period in the cycle. The length of the pre-addition halt period disposed before the addition period is varied in accordance with the temperature of the exhaust emission purifying catalyst at the start point of the cycle.

In an exhaust gas purification apparatus for an internal combustion engine, reducing agent is diffused and the exhaust resistance is made small. The apparatus includes a reducing agent addition valve that injects reducing agent, a reducing agent addition valve mount portion that has a space in which the reducing agent addition valve injects the reducing agent outside a stream of exhaust gas flowing in an exhaust passage of an internal combustion engine and on which the reducing agent addition valve is mounted, and an impingement portion that is provided in the reducing agent addition valve mount portion and on which the reducing agent injected through the reducing agent addition valve impinges, wherein the direction of injection of the reducing agent from the reducing agent addition valve is oriented toward the impingement portion, and toward downstream of the reducing agent addition valve with respect to the exhaust gas flow.

In an exhaust gas control apparatus for an internal combustion engine () of the invention, including an exhaust gas control catalyst () which purifies exhaust gas released from the internal combustion engine (), and a fuel supply valve () which supplies fuel to a portion upstream of the exhaust gas control catalyst (), the fuel supply valve () is operated such that a cycle formed by combining a fuel supply period in which fuel is supplied from the fuel supply valve () and a fuel supply stopped period in which fuel is not supplied is repeatedly performed in order to control the temperature of the exhaust gas control catalyst () to the target temperature. The arrangement of the fuel supply period and the fuel supply stopped period is controlled such that the temperature of the exhaust gas control catalyst () at each of a starting point (P) and an ending poring (P) of each cycle is equal to the target temperature.

Fuel supply control method applied to exhaust gas control apparatus for internal combustion engine and exhaust gas control apparatus to which the method is applied

Growing community of inventors

Numazu, Japan

Koichiro Fukuda