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DPF carbon loading computing method

A calculation method, DPF technology, applied in the direction of calculation, design optimization/simulation, special data processing applications, etc., can solve the problems of large personnel, time and cost, frequent DPF regeneration, high actual fuel consumption, etc., to save road test time, reduce Effects of R&D and Calibration Costs

Active Publication Date: 2018-10-12
CHINA NAT HEAVY DUTY TRUCK GRP HANGZHOU ENGINE
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Problems solved by technology

[0003] For DPF, the accuracy of the carbon load ECU calculation model is particularly important. If the actual carbon load is greater than the model carbon load, there is a risk of DPF overheating when DPF regeneration is triggered; if the actual carbon load is less than the model carbon load, it will cause DPF regeneration is too frequent, which leads to high actual fuel consumption and affects actual drivability
[0004] The calibration of the DPF carbon load ECU model is an important part of the national VI standard vehicle calibration, but the correction of the DPF carbon load calculation method solely by the vehicle test consumes a lot of personnel, time and cost

Method used

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Embodiment 1

[0042] see Figure 1 to Figure 6 , the present invention provides a DPF carbon loading calculation method, the carbon particles are mainly produced by the incomplete combustion of diesel oil in the combustion process of the engine, and then trapped in the DPF and gathered in the DPF, this process is collectively referred to as the carbon loading process of the DPF . The rate of this process, as well as the carbon load, is influenced by the NO in the exhaust 2 , O 2 As well as the influence of DPF temperature and exhaust gas flow, this patent model is built to simulate this process.

[0043] m Sot =∫(dm Sot -dm Rgn )dt Formula 1;

[0044] dm Rgn = m Sot *eff NO2 *eff O2 *eff T-m Formula 2;

[0045] The DPF model is built based on formula 1 and formula 2, where dm Sot is the output carbon flow of the engine module, dm Rgn NO for carbon in DPF 2 and O 2 The specific value of passive regeneration flow is calculated by formula 2. NO in formula 2 2 Effect on carbo...

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Abstract

The invention discloses a DPF carbon loading computing method, and relates to the technical field of diesel engines. According to the technical scheme, the DPF carbon loading computing method comprises the steps that 1, actual engine operation data is acquired; 2, the data acquired in the step 1 is compared with a weighing result of a DPF; and 3, the data acquired in the step 1 is put into a computing model for simulation computing. The DPF carbon loading computing method has the advantages that only a few actual bench tests and road tests need to be conducted, and the needed data is recordedand computed during the tests; by means of the computing model in the step 3, offline simulation computing is achieved, and meanwhile offline optimization without needing an engine system entity is conducted on DPF carbon loading calibration parameters; and by means of the model and the calibration method, as much as 95% of road test time, staff cost and fuel consumption can be saved, and the research and development cost and the calibration cost of the DPF product are significantly reduced.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a method for calculating DPF carbon loading. Background technique [0002] Compared with the National V technology, the National VI standard has more stringent restrictions on diesel engine emissions. In terms of post-treatment, in addition to the mainstream technology of National V SCR Only, new DOC, DPF and ASC carriers have been added to control the carbon in the exhaust gas. particle emissions. [0003] For DPF, the accuracy of the carbon load ECU calculation model is particularly important. If the actual carbon load is greater than the model carbon load, there is a risk of DPF overheating when DPF regeneration is triggered; if the actual carbon load is less than the model carbon load, it will cause DPF regeneration is too frequent, which leads to high actual fuel consumption and affects actual drivability. [0004] The calibration of the DPF carbon load ECU model is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 郭炎池晓谷宋洪伟何钦
Owner CHINA NAT HEAVY DUTY TRUCK GRP HANGZHOU ENGINE
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