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Method for estimating oxygen concentration downstream of diesel oxidation catalyst

An oxidation catalysis, converter technology, applied in electrical control, measuring devices, scientific instruments, etc., can solve problems such as unsatisfactory management of oxygen levels, inaccurate measurement of oxygen sensors, and no control system to measure oxygen concentration.

Inactive Publication Date: 2011-03-30
GM GLOBAL TECH OPERATIONS LLC
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Problems solved by technology

[0022] However, there are practically no control systems available for measuring and controlling the oxygen concentration downstream of the diesel oxidation catalytic converter, perhaps because control systems that rely on oxygen sensing technology have many drawbacks
[0023] In fact, the control systems described are generally satisfactory for managing steady state or slowly changing oxygen levels, but not for rapidly changing oxygen levels that may be found at some point within a diesel engine system
In addition, a wide range of oxygen sensing technologies are known to be affected by temperature and pressure conditions such that they often require proper compensation in order to produce accurate oxygen concentration information
[0024] Furthermore, oxygen sensor measurements are inaccurate when the sensor is operating under conditions with high concentrations of hydrocarbons within the exhaust stream, which is the case for DPF regeneration conditions

Method used

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  • Method for estimating oxygen concentration downstream of diesel oxidation catalyst
  • Method for estimating oxygen concentration downstream of diesel oxidation catalyst
  • Method for estimating oxygen concentration downstream of diesel oxidation catalyst

Examples

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Embodiment Construction

[0052] The preferred embodiment of the present invention is applied in figure 1 A turbocharged diesel engine system usually labeled 1.

[0053] A diesel engine system 1 includes an engine 2 having an intake manifold 3 and an exhaust manifold 4 each comprising Multiple runners.

[0054] The intake manifold 3 is located at the end of the intake line 30 and the exhaust manifold 4 is located at the beginning of the exhaust line 40 .

[0055] The air intake line 30 comprises an inlet 31 which takes in air substantially at atmospheric pressure. Downstream of the inlet 31 , a known turbocharger 5 is located in the intake line 30 for compressing the air flow and for supplying it to an intercooler 32 . Further downstream, the intake line 30 includes an intake throttle valve 33 , which is electrically controllable for varying the intake restriction.

[0056] Exhaust gas is expelled from each cylinder of the engine 2 to a corresponding plurality of runners, and enters an exhaust manifo...

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Abstract

A method is disclosed for estimating oxygen concentration downstream of a diesel oxidation catalyst (COC) 6 within a diesel engine system 1 having an intake manifold 3, a combustion chamber and an exhaust manifold 4, the diesel oxidation catalyst 6 being located in the exhaust line upstream of a diesel particulate filter (DPF) 7. The method comprises determining unburned fuel mass flow ejected from the combustion chamber, determining air mass fraction in the exhaust manifold 4, estimating air mass fraction downstream the diesel oxidation catalyst 6 as a function of the unburned fuel mass flow and the air mass fraction in the exhaust manifold 4, and estimating oxygen concentration downstream the diesel oxidation catalyst 6 as a function of the estimated air mass fraction downstream the diesel oxidation catalyst 6.

Description

technical field [0001] The present invention relates to the estimation of oxygen concentration downstream of a diesel oxidation catalytic converter (DOC) in a diesel engine system. Background technique [0002] A diesel engine system generally includes an intake manifold, at least one combustion chamber, an exhaust manifold and an exhaust line provided with a diesel oxidation catalytic converter (DOC). The diesel oxidation catalytic converter is conventionally provided for degrading residual hydrocarbons and carbon oxides which are formed during the combustion process of the engine and which are contained in the exhaust gas flow. [0003] In order to comply with stricter emission regulations, most diesel engine systems are also equipped with a diesel particulate filter (DPF), which is located in the exhaust line downstream of the DOC to capture and remove diesel particles from the exhaust flow substance (soot). [0004] Diesel particulate filters typically include a housin...

Claims

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Application Information

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IPC IPC(8): G01N15/06F01N9/00F02M25/07
CPCF02D41/1458F02D2200/0616F02D41/405F01N3/103F02D41/187F01N2900/14F01N13/02F01N11/00F01N9/005Y02T10/44F02D41/029Y02T10/47F01N13/009Y02T10/40F01N3/023F01N9/002
Inventor 伊戈尔·赞恩蒂西莫内·巴贝罗斯蒂法诺·卡萨尼
Owner GM GLOBAL TECH OPERATIONS LLC
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