Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Kabushiki Kaisha Toyota Jidoshokki

Matsuei Ueda

Shigeki Nakayama

Kazuhisa Inagaki

Shinya Hirota

Takashi Koyama

Harufumi Muto

Shunsuke Toshioka

Akira Mikami

Makoto Koike

Ryoichi Hibino

Takafumi Yamauchi

Taro Aoyama

Koichiro Fukuda

Taku Ibuki

Yoshifumi Wakisaka

Kiyomi Nakakita

Koji Kitano

Satoshi Takamoto

Masatoshi Maruyama

Ryo Hasegawa

Sakutaro Hoshi

Masakazu Sakata

Atsushi Nagai

Kohei Mori

Takashi Endo

Akira Shichi

Makoto Nagaoka

Akihiko Asano

Takato Ikedo

Hitoshi Hosaki

A catalyst state estimation apparatus includes a first sensor, a memory and a processor. The first sensor is configured to acquire information about a catalyst that removes a toxic substance in an exhaust gas, the first sensor being provided in a main passage into which the exhaust gas flows from an internal combustion engine. The memory is configured to previously store a catalyst state estimation model that includes at least one mathematical model. The processor is configured to estimate a removal performance of the catalyst by applying the information about the catalyst acquired by the first sensor to the catalyst state estimation model.

Catalyst state estimation apparatus, catalyst state estimation method with information processing apparatus, and non-transitory recording medium in which program is stored

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

In a gas-mixture-nonuniformity acquisition apparatus for an internal combustion engine, the nonuniformity of fuel concentration within a gas mixture is acquired under the assumption that, in a process in which a cylinder interior gas taken into a combustion chamber of the engine and fuel injected into the combustion chamber mix together to form a gas mixture, a collision reaction repeatedly takes place within the gas mixture in such a manner that, due to collision of two gas volumes having different fuel mass ratios, respective portions of the two gas volumes mix together, and the mixed portions separate from the corresponding gas volumes and form a portion or the entirety of another gas volume having a fuel mass ratio different from those of the two gas volumes.

Gas-mixture-nonuniformity acquisition apparatus and gas-mixture-state acquisition apparatus for internal combustion engine

A gas-mixture-ignition-time estimation apparatus for an internal combustion engine estimates the temperature of a premixed gas mixture for PCCI combustion (i.e., cylinder interior temperature Tg), while relating it to the angle CA, on the basis of a state quantity of the cylinder interior gas at the time of start of compression (CAin) (heat energy of the cylinder interior gas at the time of start of compression), the amount of a change in the state quantity of the cylinder interior gas attributable to compression in a compression stroke (minute piston work), and the heat generation quantity of a cool flame generated in PCCI combustion prior to autoignition (hot flame) (cool flame heat generation quantity Aqlto). A time when the cylinder interior temperature Tg reaches a predetermined autoignition start temperature Tig is estimated as an autoignition start time (Caig) of the premixed gas mixture related to PCCI combustion. Since the cool flame heat generation quantity Oqlto is taken into consideration, the autoignition start time related to PCCI combustion can be estimated accurately.

Gas-mixture-ignition-time estimation apparatus for internal combustion engine, and control apparatus for internal combustion engine

Growing community of inventors

Nisshin, Japan

Matsuei Ueda