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Method for operating post injections of fuel in an internal combustion engine

A technology of post injection and operation method, applied in the direction of internal combustion piston engine, combustion engine, mechanical equipment, etc., can solve problems such as cost impact of engine control unit

Inactive Publication Date: 2015-01-21
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] This huge number of correction parameters naturally leads to a lot of work in the correction development, especially in terms of time and resources, and also has a cost impact on the engine control unit, for example in the use of RAM memory

Method used

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  • Method for operating post injections of fuel in an internal combustion engine
  • Method for operating post injections of fuel in an internal combustion engine

Examples

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Embodiment Construction

[0061] now refer to Figure 1-2 The figures in the figure describe the preferred embodiment of the present invention.

[0062] exist figure 1 In , an engine 60 is schematically shown together with a diesel oxidation catalyst (Diesel Oxidation Catalyst, DOC) 50 having an inlet 61 and an outlet 64 . The outlet 64 of the DOC is connected to a downstream diesel particulate filter 63 , the method being used to operate the regeneration cycle of this particulate filter 63 .

[0063] In order to implement the method of an embodiment of the invention, a model of a diesel oxidation catalyst (DOC) and in particular its thermal behavior under various conditions of use has been established. By increasing the HC in the exhaust, the DOC becomes a heat generator. This principle is used to achieve a temperature increase to regenerate the DPF 63 . The HC content in the exhaust gas is controlled by post-fuel injection and, in the described embodiment, by the correct amount of injected fuel. ...

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Abstract

A method is provided for operating an engine. The engine is configured to post inject a quantity of fuel into a combustion chamber and includes, but is not limited to a Diesel Oxidation Catalyst (DOC) that has an inlet and an outlet. The method includes, but is not limited to determining an open loop post injection quantity qpost-OL of fuel as a function of a target temperature TOtarget for the Diesel Oxidation Catalyst (DOC) outlet, the step of determining the current temperature TO at the Diesel Oxidation Catalyst (DOC) outlet and the step of determining, for the temperature TO, a closed loop post injection quantity qpost-CL of fuel needed for correcting the open loop post injection quantity qpost-OL for determining a correct post injection fuel quantity qpost needed to match the desired DOC heat release related to the target temperature TOtarget when operating the engine system.

Description

technical field [0001] The invention relates to a method for operating fuel post injection in an internal combustion engine. The method may be used to perform diesel particulate filter regeneration. Background technique [0002] A Diesel Particulate Filter (also referred to in this specification as DPF) is known as a device positioned in the exhaust line of a diesel engine; the device is used to trap soot in order to clean the exhaust gas and to meet certain regulatory emission limits. [0003] The electronic system that manages the engine can recognize when the filter is full; at this point it will command the so-called DPF regeneration process: a process that essentially empties the filter based on the automatic combustion of soot inside the trap itself. The DPF is regenerated by raising the exhaust gas temperature (up to 600°C) for a short period (about 10 minutes). The frequency of this regeneration process is usually related to DPF loading time or mileage, and can var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/025F01N9/00
CPCF01N13/009F01N2430/085Y02T10/44F02D41/029F02D41/405F01N3/023F01N3/103Y02T10/40F01N3/035F02D41/0245
Inventor 斯蒂法诺·卡萨尼
Owner GM GLOBAL TECH OPERATIONS LLC