Isuzu Motors Limited

Atsushi Matsunuma

Takao Onodera

Takashi Haseyama

Takuro Iwashita

Shigeru Ikeda

Wei Wu

Tatsuo Mashiko

Toshio Miyazaki

The present invention provides an engine exhaust gas purification device comprising a filter B provided in an exhaust passage () of an engine () for trapping particulate matter contained in the exhaust gas, a catalyst A for regenerating the filter B by burning the particulate matter trapped in the filter B, an EGR valve () provided in an EGR passage () linking the intake side and exhaust side of the engine, an injector () for injecting fuel into a cylinder, and control unit () for controlling the injector () and EGR valve (). During regeneration of the filter B, the control unit () close the EGR valve () when fuel injection from the injector () is controlled to supply unburned fuel components to the catalyst A, and open the EGR valve () when no fuel is injected from the injector () upon a request for speed reduction or the like. In so doing, residual unburned fuel components in the EGR passage () are scavenged by air.

Engine exhaust gas purification device

A method and system providing a vehicle condition detection means (C) for detecting the stopped and traveling state of a vehicle, and when the vehicle condition detection means (C) detects that the vehicle has stopped during operation of an exhaust gas temperature raising means (C), closing an exhaust gas throttling valve () in addition to continuing the operation of the exhaust gas temperature raising means (C), and subsequently, when the vehicle's traveling state is detected, opening the exhaust gas throttling valve () and continuing the operation of the exhaust gas temperature raising means (C). Accordingly, in terms of the regeneration of a continuous regeneration-type DPF device () capable of significantly reducing the frequency with which the driver is urged to stop the vehicle and perform forced regeneration, the exhaust gas can be efficiently maintained at a high temperature, and reliable burning of PM is possible even for driving patterns featuring frequent waiting at traffic signals in urban areas, even upon transition to the stationary idling condition during automatic traveling regeneration.

Control method for an exhaust gas purification system and an exhaust gas purification system

Growing community of inventors

Fujisawa, Japan

Atsushi Matsunuma