An exhaust gas purifying equipment for a diesel engine having a first continuous regeneration type DPF (12) in an exhaust passage (7) of an engine (2), a second continuous regeneration type DPF (13) in a bypass passage (101), a switching valve (102) for switching the flow path of an exhaust gas, an
An exhaust gas purifying equipment for a diesel engine having a first continuous regeneration type DPF (12) in an exhaust passage (7) of an engine (2), a second continuous regeneration type DPF (13) in a bypass passage (101), a switching valve (102) for switching the flow path of an exhaust gas, an exhaust temperature raising means, an exhaust temperature area detector, and a controller controlling the exhaust temperature raising means and the switching valve (102), wherein the controller operates the exhaust temperature raising means and at the same time executes the post-injection, and, furthermore, controls the switching valve (102) so that the exhaust gas passes through the second continuous regeneration type DPF (13), in the case where the exhaust temperature area of an engine (2) detected by the exhaust temperature area detector is in an extremely low temperature area (Z2) of which the exhaust temperature is lower than that of a predetermined temperature area. Thereby, even under an environment such as a very cold land, the PM collected by the DPF can be made burn steadily and continuously over the whole operating range of an in-vehicle diesel engine.
대표청구항▼
What is claimed is: 1. An exhaust gas purifying equipment for an engine comprising: a first filter disposed in an exhaust passage of the engine; a second filter disposed in a bypass passage upstream of the first filter; a detector detecting the exhaust temperature area of the engine; a switching va
What is claimed is: 1. An exhaust gas purifying equipment for an engine comprising: a first filter disposed in an exhaust passage of the engine; a second filter disposed in a bypass passage upstream of the first filter; a detector detecting the exhaust temperature area of the engine; a switching valve; and a controller controlling an exhaust temperature and the switching valve in correspondence to the exhaust temperature area of the engine detected by the detector, the controller executing a post-injection, and furthermore controlling the switching valve so that the exhaust gas passes through the second filter, in the case where the exhaust temperature area of the engine detected by the detector is an extremely low temperature area of which the exhaust temperature is lower than that of a predetermined temperature area, wherein the second filter has a capacity which is smaller than that of the first filter, and the second filter is disposed downstream of the exhaust manifold. 2. An exhaust gas purifying equipment for a diesel engine, comprising: a first continuous regeneration type diesel particulate filter disposed in an exhaust passage of an engine; a bypass passage bypassing the exhaust passage at the upstream of the first continuous regeneration type diesel particulate filter; a second continuous regeneration type diesel particulate filter disposed in the bypass passage; a switching valve for switching the flow path of an exhaust gas disposed in said exhaust passage between the bypass passages; exhaust temperature raising means for raising the exhaust temperature of the engine; exhaust temperature area detection means for detecting the exhaust temperature area of the engine; and control means for controlling the exhaust temperature raising means and the switching valve in correspondence to the exhaust temperature area of the engine detected by the exhaust temperature area detection means, the control means operating the exhaust temperature raising means, executing a post-injection, and furthermore controlling the switching valve so that the exhaust gas passes through the second continuous regeneration type diesel particulate filter, in the case where the exhaust temperature area of the engine detected by the exhaust temperature area detection means is an extremely low temperature area of which the exhaust temperature is lower than that of a predetermined temperature area, wherein the second continuous regeneration type DPF has a capacity which is composed smaller than that of the first continuous regeneration type DPF and the second continuous regeneration type DPF is disposed substantially just downstream of the exhaust manifold. 3. The exhaust gas purifying equipment for the diesel engine in claim 2, wherein the control means operates the exhaust temperature raising means and at the same time, without executing the post-injection control, controls the switching valve so that the exhaust gas passes through the second continuous regeneration type diesel particulate filter, in the case where the exhaust temperature area of the engine detected by the exhaust temperature area detection means is in the low temperature area, but in the area of which the exhaust temperature is higher than that of the extremely low temperature area. 4. The exhaust gas purifying equipment for a diesel engine in claim 2, wherein the post-injection is performed in the range of 80�� BTDC to 120�� BTDC. 5. The exhaust gas purifying equipment for a diesel engine in claim 2, wherein the post-injection quantity is set to 10% to 20% of the main injection quantity.
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이 특허에 인용된 특허 (8)
Webb Cynthia Chaffin, Active porous medium aftertreatment control system.
Wade Wallace R. (Farmington Hills MI) Rao Vemulapalli D. N. (Bloomfield Township ; Oakland County both of MI), Filtration system for diesel engine exhaust-II.
Bluhm, Kurt; Loerch, Henning, Method for the post-treatment of exhaust gases by subsequent injection of fuel in a diesel-type internal combustion engine provided with a pre-catalyst and a particle filter.
Hepburn, Jeffrey Scott; Ruona, William Charles; Fulton, Brien Lloyd; Surnilla, Gopichandra; Kurtz, Eric Matthew, Methods and systems for emission system control.
Hepburn, Jeffrey Scott; Ruona, William Charles; Fulton, Brien Lloyd; Surnilla, Gopichandra; Kurtz, Eric Matthew, Methods and systems for emission system control.
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