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AssigneeMazda Motor Corporation
InventorsYoshitaka Nomoto, Hirofumi Yamauchi, Shigeru Sakurai, Kenji Ohkubo, Hideaki Kurita, Kunihiro Yagi
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An internal combustion engine is provided in its exhaust system with a particulate filter for trapping combustible particulates contained in exhaust gas. A combustion promoting material injection device is provided for injecting a material for promoting combustion of the combustible particulates into the exhaust system upstream of the particulate filter. Further there are provided a bypass exhaust passage which bypasses the combustion promoting material injection device and the particulate filter, and a flow control valve which controls the amount of exhaust gas flowing through the bypass exhaust passage to control the amount of exhaust gas flowing into the particulate filter when said combustion promoting material is to be injected from the injecting device. When the combustion promoting material is injected, the flow control valve controls the amount of exhaust gas flowing into the particulate filter so that the combustion promoting material can uniformly adhere to the surface of the combustible particulates over the entire area thereof and so that the combustion temperature of the combustible particulates is prevented from rising abnormally high.
An exhaust gas cleaning system for an internal combustion engine comprising a particulate filter which is provided in the exhaust system of the engine to trap combustible particulates contained in exhaust gas discharged from the engine, a combustion promoting material injecting device which is disposed in the exhaust system upstream of the particulate filter to inject a combustion promoting material for promoting combustion of the combustible particulates trapped by the particulate filter, a bypass exhaust passage which connects a portion of the exhaust passage upstream of the combustion promoting material injecting device and a portion of the same downstream of the particulate filter bypassing the combustion promoting material injecting device and the particulate filter, a control valve means for controlling flow of the exhaust gas into the particulate filter, and a control means which controls the time the combustion promoting material injecting device injects the combustion promoting material and controls the control valve means so that the amount of the exhaust gas flowing into the filter is adjusted to a preset amount while the combustion promoting material injecting device injects the combustion promoting material.
Dependencies are inferred from the claim text.