Exhaust gas purification system in plateau

An exhaust gas purification system, high-altitude technology, applied in the direction of exhaust treatment, electrical control, exhaust device, etc., can solve the problems of torque drop, torque rise, damage to drivability, etc., and achieve the effect of maintaining drivability

CN102906381BActive Publication Date: 2015-07-29ISUZU MOTORS LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-07-29

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Abstract

Provided is an exhaust gas purification system in an upland area capable of maintaining engine performance when a vehicle travels in a normal drive mode in an upland area, securing the amount of oxygen required for post-injection when the vehicle is in a regeneration mode, and switching between the normal mode and the regeneration mode without causing incongruity. When a DPD 25 of the vehicle traveling in the normal drive mode in the upland area is to be automatically regenerated by raising the temperature of exhaust gas from a diesel engine 10, the exhaust gas purification system determines an upland full-load injection quantity from the atmospheric pressure in the upland area and an engine speed while the vehicle is in motion and drives the vehicle with the injection quantity determined. The exhaust gas purification system determines, during the regeneration mode, an upland drive regeneration injection quantity obtained by decreasing the upland full-load injection quantity on the basis of the quantity required for the post-injection. The injection quantity is gradually decreased from the upland full-load injection quantity to the upland regeneration drive injection quantity when the vehicle shifts from the normal drive mode in the upland area to the upland regeneration mode, so that the decreased quantity is used for the post-injection. After the regeneration is completed, the injection quantity is increased from the upland regeneration drive injection quantity to the upland full-load injection quantity.
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Description

technical field

[0001] The present invention relates to an exhaust gas purification system that captures PM (Particulate Matter: Particulate Matter) in exhaust gas of a diesel engine and purifies NOx to exhaust the exhaust gas. In particular, it relates to a system capable of regenerating DPD at high altitudes without degrading normal driving performance. Exhaust gas purification system in the plateau. Background technique

[0002] As an exhaust gas purification system that purifies and exhausts the exhaust gas of a diesel engine, an exhaust gas purification system that connects a DPD (Diesel Particulate Defuser; Diesel Particulate Eliminator) and an SCR (Selective Catalytic Reduction) device to the exhaust pipe has been developed. system.

[0003] In this exhaust gas purification system, PM in the exhaust gas is captured by the DPD. In addition, in the exhaust gas purification system, through the SCR system equipped with the SCR device, the ammonia water stored in the ure...

Examples

Embodiment Construction

[0029] Hereinafter, a preferred embodiment of the present invention will be described in detail based on the drawings.

[0030] exist figure 1 In this process, the intake manifold 11 and exhaust manifold 12 of the diesel engine 10 are respectively connected to the compressor 14 and the turbine 15 of the supercharger 13, and the air from the upstream side intake pipe 16a is boosted by the compressor 14 and passes through the downstream The intercooler 17 of the side intake pipe 16b is cooled, and is supplied from the intake manifold 11 to the diesel engine 10 via the intake throttle valve 18, and the exhaust gas from the diesel engine 10 drives the turbine 15, and then exhausts it to Exhaust pipe 20.

[0031] An air flow sensor (MAF) 19 for measuring an intake air amount is provided in the upstream intake pipe 16 a , and the air flow sensor (MAF) controls the opening of the intake throttle valve 18 to adjust the intake air amount. In addition, the exhaust pipe 20 and the upst...