Isuzu Motors Limited

Wei Wu

Tatsuo Mashiko

Takao Onodera

Shigeru Ikeda

Naofumi Ochi

Takashi Haseyama

Takuro Iwashita

Atsushi Matsunuma

Toshio Miyazaki

An exhaust gas purification system has an exhaust gas purification device for purifying components in exhaust gas from an internal combustion engine. In order to recover a purification ability of the device, and in order to prevent oil dilution occurring when post injection is conducted during control that raises the temperature of exhaust gas, the system performs the following, during control; injection quantities of post injections are calculated based on previously set map data, accumulated to calculate a post injection accumulated injection amount, and, when the accumulated injection amount exceeds a predetermined value, the post injection is stopped to cease the regenerative control.

Control method of exhaust gas purification system and exhaust gas purification system

In an exhaust gas temperature raising control for recovering purification ability of an exhaust gas purification device of an internal combustion engine, the exhaust gas temperature is efficiently raised to a target level without producing white smoke. In recovery control of the exhaust gas purification device, when the temperature of the exhaust gas flowing into the exhaust gas purification device is lower than a predetermined judgment value, a first exhaust gas temperature raising control that does not include post injection but includes intake air restriction is performed, and when equal to or higher than the predetermined judgment value, a second exhaust gas temperature raising control that includes both the post injection and the intake air restriction is performed to set an intake air restriction amount in the first exhaust gas temperature raising control greater than an intake air restriction amount in the second exhaust gas temperature raising control.

Method of controlling exhaust gas purification system, and exhaust gas purification system

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.

Growing community of inventors

Fujisawa, Japan

Wei Wu