Isuzu Motors Limited

Hiroyuki Ishikawa

Takashi Ikeda

Hitoshi Satou

Takao Onodera

Naofumi Ochi

Takashi Haseyama

Tetsuya Murata

Masahiro Kajiyama

Kenzou Yaginuma

Takayuki Mukunashi

Hiroshi Kubo

An exhaust gas purification device includes an exhaust gas after-treatment device provided in an exhaust passage of an internal combustion engine, and has an oxidation catalyst and a DPF or diesel particulate filter. The exhaust gas purification device also includes an exhaust pipe injector which feeds a fuel to the oxidation catalyst, and a control unit which controls regeneration of the filter by supplying the oxidation catalyst with the fuel from the exhaust pipe injector. The control unit determines whether the filter is in a regeneration-possible state, i.e., whether the oxidation catalyst is maintained at a high temperature allowing regeneration of the filter. If the control unit determines during regeneration control of the filter that the filter is not in the regeneration-possible state, then the control unit halts the regeneration control until the regeneration-possible state is reached.

Exhaust gas purification device of internal combustion engine

A diesel particulate filter ('DPF') system that suppresses clogging of a DPF and enhances convenience including accumulated particulate matter ('PM') quantity estimator for estimating an accumulated PM quantity in an idle state; and a long low idle forced regeneration unitthat if the accumulated PM quantity estimated by the accumulated PM quantity estimation estimator exceeds a predetermined quantity, performs long low idle forced regeneration that automatically performs regeneration of the DPF, and the long low idle forced regeneration unit, when a vehicle starts moving during long low idle forced regeneration, performs automatic regeneration of the diesel particulate filter while the vehicle is moving.

Diesel particulate filter system

A diesel particulate defuser ('DPD') is connected to an exhaust pipe of a diesel engine, an exhaust gas temperature during automatic regeneration of the DPD is detected, and the difference between the detected exhaust gas temperature and a target regeneration temperature is determined. In a case where an exhaust pipe injection amount is PID controlled based on this difference, when an exhaust brake valve is closed during traveling automatic regeneration, the exhaust pipe injection is stopped and calculation of an integral control term by the PID control is continued as long as the exhaust valve brake valve is closed, and when the exhaust brake valve is opened, the integral control term that has been continuously calculated is taken as an initial operation amount.

Exhaust gas purification system

An exhaust gas purification system with which diesel particulate filter ('DPF') regeneration can be continued even when deceleration occurs during the DPF regeneration. The system includes a regeneration deceleration period intake/exhaust control unit that, when a vehicle decelerates during the DPF regeneration, increases an exhaust gas flow rate through an exhaust pipe by controlling respective openings of an exhaust gas recirculation ('EGR') device and an intake throttle and adjusting a turbocharging amount of a high pressure stage turbocharger.

Growing community of inventors

Fujisawa, Japan

Hiroyuki Ishikawa