초록 ▼

A particulate oxidizer system for a diesel engine comprises a diesel particulate oxidizer (DPO) in the exhaust line to collect and burn particulates in the exhaust. The DPO comprises ceramic foam with a catalyst. When the quantity of particulates in the DPO reaches a predetermined value, high temper

A particulate oxidizer system for a diesel engine comprises a diesel particulate oxidizer (DPO) in the exhaust line to collect and burn particulates in the exhaust. The DPO comprises ceramic foam with a catalyst. When the quantity of particulates in the DPO reaches a predetermined value, high temperature gas containing oxygen is fed to the DPO to burn off (regenerate) the collected particulates. This is achieved by retard control of the injection timing under control of an engine control unit (ECU). A regeneration timing detection means detects the regeneration timing in the DPO. When the quantity of particulates in the DPO falls below a predetermined value, the ECU provides a signal to increase the idling revolution of the engine.

대표청구항 ▼

In a diesel engine having a fuel injection pump and fuel control means for controlling the injection volume or injection timing of said fuel injection pump, a diesel particulate oxidizer regeneration system including: a diesel particulate oxidizer disposed in an exhaust system of the diesel engine a

In a diesel engine having a fuel injection pump and fuel control means for controlling the injection volume or injection timing of said fuel injection pump, a diesel particulate oxidizer regeneration system including: a diesel particulate oxidizer disposed in an exhaust system of the diesel engine and having a trap carrier for collecting unburnt fine particles contained in exhaust gas, said trap carrier supporting an oxidation catalyst; a regeneration means for burning the unburnt fine particles collected in said diesel particulate oxidizer; a regeneration timing control means for detecting the quantity of the unburnt fine particles deposited in said diesel particulate oxidizer and providing a signal to said regeneration means for operating the latter when the detected value is above a predetermined value; and a regeneration end control means for detecting that the quantity of the unburnt fine particles collected and deposited in the diesel particulate oxidizer has become less than the predetermined value after combustion, and producing a signal for stopping the operation of said regeneration means, characterized by said regeneration timing control means being provided with a pressure detection means for detecting pressure loss of the diesel particulate oxidizer, said pressure detecting means including an exhaust pressure detecting pipe for conducting the pressure of the exhaust system of the diesel engine to a pressure sensor, and filter means disposed in said exhaust pressure detecting pipe, said filter means having a casing in which are disposed a filter for collecting particles in the exhaust gas, a water trapping wire mesh disposed closer to the exhaust passage than said filter and an exhaust pulsation reducing volume.