Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Tadashi Watanabe

Kohei Yoshida

Takamitsu Asanuma

Akira Kato

Kotaro Hayashi

Noriaki Kawai

Takashi Yamaguchi

Yasuaki Nakano

Takeshi Sato

Mitsumasa Yamada

Terutada Kojima

Teruo Sato

Koji Nagata

Tadashi Fukuyama

Toshio Fujimura

Masato Hattori

Takaaki Ohashi

Zenji Kuwabara

Noriyosi Toyoda

A fuel addition valve that adds fuel into the exhaust gas passage of the engine in the form of fine fuel droplets, an upstream NOx adsorption-reduction catalyst, and a downstream NOx adsorption-reduction catalyst are arranged in this order. Platinum Pt and palladium Pd, as noble metal, are supported on the downstream NOx adsorption-reduction NOx catalyst such that the ratio of the mole number of the platinum Pt to the sum of the mole numbers of the platinum Pt and the palladium Pd is approx. 50% to approx. 80%. Only platinum Pt is supported on the upstream NOx adsorption-reduction catalyst. According to this structure, even when liquid fuel is supplied into exhaust gas, NOx can be effectively released from the NOx adsorption-reduction catalyst, and further the amount of NOx that the NOx adsorption-reduction catalyst can adsorb at a low temperature increases.

Exhaust gas purification apparatus for internal combustion engine

A pilot injection device for a fuel injection pump has an accumulate piston movable in response to a fuel pressure from a pressurizing chamber of the fuel injection pump to cause a pilot injection prior to a main injection by the pump. The device is provided with a back-pressure chamber filled with fuel and having a volume variable by the movement of the accumulate piston. Air trapped in the back-pressure chamber can be removed therefrom through a hole to improve the operation characteristic of the pilot injection device.

Pilot injection device for fuel injection pump

Growing community of inventors

Toyota, Japan

Tadashi Watanabe