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System implementing low-reductant engine operation mode

一种还原剂、控制系统的技术，应用在发动机元件、燃烧发动机、发动机控制等方向，能够解决没有提供充足供应尿素等问题

Active Publication Date: 2009-09-16
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, the system of the '307 patent does not provide a strategy for addressing adequate supply of urea when the required supply rate of urea is not achieved, such as when the urea source is frozen and is slow to thaw.

Method used

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  • System implementing low-reductant engine operation mode
  • System implementing low-reductant engine operation mode
  • System implementing low-reductant engine operation mode

Examples

Experimental program
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Embodiment Construction

[0014] figure 1 The power unit 10 is shown having a fuel system 20 , an exhaust system 40 and an aftertreatment system 60 . For the present invention, a four-stroke diesel engine is taken as an example to describe and illustrate the power unit 10 . However, those skilled in the art will appreciate that the power unit 10 may be any other type of internal combustion engine, such as a gasoline engine, a gas fuel powered engine or a turbine engine. The power unit 10 may include an engine block 12 at least partially defining a plurality of combustion chambers 14 . In the illustrated embodiment, the power unit 10 has four combustion chambers 14 . However, it is contemplated that the power unit 10 may include a greater or lesser number of combustion chambers 14, and that the combustion chambers 14 may be arranged in an "in-line" configuration, a "V" configuration, or any other suitable configuration.

[0015] same as figure 1 As shown, the power unit 10 may include a crankshaf...

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PUM

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Abstract

A control system (80) for a power unit (10) having a supply of fuel (22) and a supply of reductant (64) is disclosed. The control system may have a first sensor (24) associated with the supply of fuel to generate a signal indicative of a quantity of fuel remaining. The control system may also have a second sensor (72) associated with the supply of reductant to generate a signal indicative of a quantity of the reductant remaining. The control system may further have a controller (82) in communication with the first and second sensors. The controller may be configured to affect operation of thepower unit such that the remaining fuel is consumed before consumption of the remaining reductant.

Description

technical field [0001] The present invention relates to engine operating modes, and more particularly, to a system for implementing an engine economizing operating mode in response to a low reductant supply level. Background technique [0002] Internal combustion engines - including diesel engines, gasoline engines, gaseous fuel powered engines, and others known in the art - emit a complex mixture of air pollutants. These air pollutants consist of gaseous compounds such as nitrogen oxides (NO x )composition. Due to the enhancement of environmental protection awareness, the exhaust emission standards have become more stringent, and the NO emitted by the engine x The amount of is adjusted according to the type of engine, the size of the engine and / or the class of the engine. To ensure compliance with regulations for these compounds, some engine manufacturers implement a strategy known as selective catalytic reduction (SCR). [0003] SCR is a method in which a gaseous or li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F02D41/22
CPCG01F23/30F01N2900/1806F02D41/401F01N2900/08G01F9/001F01N2900/1814F02D2250/36Y02T10/44F02D41/0235Y02T10/24F01N3/2066F02D41/2422F01N2610/02Y02T10/12Y02T10/40
Inventor G·E·唐纳森J·J·德里斯科尔
Owner CATERPILLAR INC
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