Apparatus and method for preventing overheating of exhaust purification filter

a technology apparatus, which is applied in mechanical apparatus, electrical control, machines/engines, etc., can solve the problems of exhaust purification filter overheating or deterioration, and the exhaust purification filter is more likely to overheat, so as to effectively prevent the exhaust purification filter of an internal combustion engine from overheating
US20060016180A1Inactive Publication Date: 2006-01-26TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2006-01-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

An apparatus for preventing a filter for purifying exhaust gas emitted by a vehicle diesel engine from overheating is provided. The filter filters particulate matter in exhaust gas. Particulate matter that is accumulated in the filter through filtering is burned and purified by executing a temperature increase process in which the filter is heated. The apparatus includes an electronic control unit as overheat prevention means. During the temperature increase process, the overheat prevention means executes an increase process for increasing the flow rate of exhaust gas when the filter is likely to overheat. As a result, the filter is effectively prevented from overheating.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an apparatus and a method for preventing overheating of an exhaust purification filter that is provided in the exhaust system of an internal combustion engine, which exhaust purification filter filters particulate matter in exhaust gas, and burns and purifies particulate matter accumulated during the filtering.

[0002] Japanese Laid-Open Patent Publication No. 2002-371889 discloses a technique for purifying exhaust gas, in which a NOx storage reduction catalyst is disposed in the exhaust system of an internal combustion engine. In the configuration of the publication, exhaust gas is set to reducing atmosphere when the internal combustion engine is decelerating, so that NOx stored in a catalyst is reduced. When setting exhaust gas to reducing atmosphere, the intake flow rate is reduced or the amount of exhaust gas recirculation is increased.

[0003] Instead of or in addition to the catalyst, an exhaust purification fil...

Claims

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