Isuzu Motors Limited

Takuro Iwashita

Takao Onodera

Tatsuo Mashiko

Takashi Haseyama

Kenji Hagio

Yoshinobu Watanabe

Shigeru Ikeda

Tetsuya Murata

Wei Wu

Atsushi Matsunuma

Hitoshi Sato

Masashi Gabe

Naofumi Ochi

Masanobu Minezawa

Takashi Ikeda

Hitoshi Satou

Yoshihisa Tashiro

Toshio Miyazaki

Hidetaka Shibata

Takeshi Igarashi

A recovery control system that allows a dosing valve to recover from a malfunction to a normal state, or a liquid feed line through which urea solution is fed to recover from clogging to a normal state. An abnormality detector detects an abnormality of the dosing valve and a recovery controller controls a supply module to feed urea solution in the dosing valve back to an urea tank when the abnormality detector detects the abnormality.

Recovery control system

In forced regeneration control of an exhaust gas purification device a number of data for injection control, such as a number of meshes of a data map and a number of data maps for multi injection control, is decreased while occurrence of torque shock, which is a rapid fluctuation of a generated torque, is avoided. In this forced regeneration control, when an operation state of an internal combustion engine is a high-load operation state, the normal injection control by stopping the multi injection is carried out and, according to a rotation speed and a load of the internal combustion engine, a region for control is divided into a multi-injection control region, a transition region, and a normal injection control region. In the transition region, data for injection control obtained by interpolation of data for injection control on the multi-injection control region side and data for injection control on the normal injection control region side is used.

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

In emergency regeneration, i.e., after a judgment is made that purification is insufficient after ending forced regeneration, forced regeneration has expired before completion, or when a pressure difference across a diesel particulate filter exceeds a predetermined first judging pressure difference when traveling distance of a vehicle is shorter than a predetermined distance, an alarm for urging manual regeneration is issued. When manual regeneration is designated thereafter by the vehicle's user, manual regeneration is performed. When predetermined conditions are satisfied before receiving a designation of manual regeneration, automatic regeneration is performed.

Exhaust emission purification method and exhaust emission purification system

At regeneration control while a vehicle mounting an internal combustion engine () is parked, both an exhaust throttle valve () and an exhaust brake valve () are used and if a catalyst temperature index temperature (Tg) is lower than a predetermined first determining temperature (Tc), first exhaust gas temperature rise control is conducted that the exhaust brake valve () is set to a fully closed side and multiple injection is carried out in in-cylinder fuel injection control, while if a catalyst temperature index temperature (Tg) is equal to the predetermined first determining temperature (Tc) or above, second exhaust gas temperature rise control is conducted that the exhaust brake valve () is set to an open side, the exhaust throttle valve () is set to the fully closed side, and post injection is carried out in the in-cylinder fuel injection control. By this arrangement, while temperature rise efficiency of an exhaust gas flowing into a DPF () is enhanced, forced regeneration is carried out efficiently in a short time with avoiding overheat or abnormal combustion at the regeneration control of the DPF () while the vehicle is parked.

In regeneration control, when the catalyst temperature index temperature (Tg) using the temperature of the oxidation catalyst () as an index is below a predetermined first determination temperature (Tc), the engine speed of idling is brought to a predetermined first target engine speed (Nei) which is higher than the engine speed of idling (Nei) in the ordinary operation, and, further, multi-injection is carried out. On the other hand, when the catalyst temperature index temperature (Tg) is the predetermined first determination temperature (Tc) or above, the engine speed of idling is brought to a predetermined second target engine speed (Nei), which is lower than the predetermined first target engine speed (Nei) and is higher than the engine speed of idling (Nei) in ordinary operation, and, further, post injection is carried out, followed by raising of the temperature of an exhaust gas flown into a DPF apparatus () to a predetermined second determination temperature (Tc). According to the above constitution, in the regeneration control of the DPF apparatus () in an internal combustion engine (), the regeneration can be forcibly carried out with high efficiency while enhancing the temperature rise efficiency of the exhaust gas, and, at the same time, excessive rise in the exhaust temperature, a deterioration in fuel consumption, and the occurrence of noise are suppressed.

Method for controlling exhaust gas purification system and exhaust gas purification system

A fuel injection control device that prevents a misfire is provided. The fuel injection control device comprises: target injection amount determination meansfor determining a target injection amount of each fuel injection, so that the amount of fuel to be supplied to a cylinder in one combustion cycle is supplied in a plurality of fuel injections; and fuel injection correction amount determination meansfor determining a fuel correction amount of one combustion cycle, wherein the fuel injection correction amount determination meansdistributes the correction amount among each fuel injection in accordance with the ratio of a target injection amount of each fuel injection in the cylinder.

Fuel injection control device

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

To provide an exhaust gas purifying system capable of forcibly regenerating DPF by efficiently raising the temperature of exhaust gas even when an exhaust gas temperature is very low at the time of low load and low engine speed such as an idling operation. In an exhaust purifying system () having an exhaust throttling valve () and a DPF () in an exhaust passage and having regeneration control means (P) for regenerating the DPF (), the regeneration control means (P) is provided with an exhaust gas temperature detection means (P), a fuel injection control means (P), and an exhaust throttling control means (P) and includes regeneration control for performing the exhaust gas temperature raising control through the multistage delay injection by the fuel injection control means (P) and through the exhaust throttling of the exhaust throttling valve ().

Growing community of inventors

Fujisawa, Japan

Takuro Iwashita