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A carbon load calculation method and calculation module based on oxygen concentration changes

A calculation method and technology of carbon load, applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, machines/engines, etc. Normal level and other problems, to achieve the effect of simple and easy to implement control method, ensure normal operation, and protect from being blocked

Active Publication Date: 2020-10-30
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The quality of oil products or diesel filters in the market is not up to standard, which will often lead to failures such as wear of injector holes, blockage of injection holes, and sticking of injectors; failures such as engine supercharger, air intake and intercooling pipeline leakage and blockage; these oils Failures related to the gas circuit will cause the actual fuel injection volume or the actual intake air volume to change, thereby affecting the combustion, causing the soot emission in the engine exhaust to exceed or fall below the normal level (that is, causing the oxygen concentration in the engine exhaust to change)
[0003] In the current control strategy, the change of the engine soot level caused by the failure of the engine oil circuit and gas circuit is not considered
Therefore, when the oil circuit and air circuit fail, the original DPF carbon load estimation (calculated value of the original carbon load model) is inaccurate, and cannot correctly enter the subsequent regeneration process (after the accumulated carbon load of the DPF filter reaches a certain level, the carbon loading process)
When the actual fuel injection volume increases or the actual air intake volume decreases, the soot level in the exhaust gas increases, the carbon load is underestimated, and the vehicle continues to drive, which will cause the DPF filter to be blocked, the vehicle power is insufficient, and the carrier of the DPF filter move back
When the model estimates that regeneration is required, the actual carbon load level inside the DPF filter has exceeded the safe regeneration threshold. If regeneration is performed at this time, the temperature is too high, resulting in excessive thermal stress, which will burn the carrier
In the market, DPF filter clogging, carrier burning, and carrier moving backward frequently occur

Method used

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  • A carbon load calculation method and calculation module based on oxygen concentration changes
  • A carbon load calculation method and calculation module based on oxygen concentration changes
  • A carbon load calculation method and calculation module based on oxygen concentration changes

Examples

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Embodiment 1

[0045] Depend on Figure 1 to Figure 3 Commonly shown, a carbon loading calculation method based on changes in oxygen concentration, specifically includes the following steps:

[0046] S1. Find the oxygen concentration set value ratO2_set under the current working condition from the pre-calibrated oxygen concentration MAP map based on the engine speed n under the current working condition and the fuel injection quantity q of the injector.

[0047]Among them, step S1 includes: performing engine bench tests based on different simulated working conditions, and calibrate the characteristic curves of speed n, fuel injection quantity q and oxygen concentration under different working conditions, and the characteristic curve is defined as the oxygen concentration MAP diagram; The concentration MAP map is pre-stored in the engine electronic control unit for easy search and call.

[0048] S2. The oxygen sensor measures the actual oxygen concentration value ratO2_act under the current ...

Embodiment 2

[0063] The idea of ​​the second embodiment is basically the same as that of the first embodiment, the only difference is that the original carbon load model calculation value soot_base is more accurate, and only the difference will be described in detail below.

[0064] Depend on Figure 4 As shown, step S4 includes:

[0065] S40. Carry out engine bench tests based on different simulated working conditions, and calibrate the characteristic curves of the pressure difference at both ends of the DPF filter, the engine exhaust gas flow rate and the carbon accumulation rate under different working conditions, or calibrate the speed n, injection The characteristic curve of fuel quantity q and carbon accumulation rate; the characteristic curve is defined as a carbon accumulation rate MAP map; the carbon accumulation rate MAP map is pre-stored in the engine electronic control unit for easy search and call.

[0066] S41. Based on the pressure difference at both ends of the DPF filter ...

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Abstract

The invention discloses a carbon loading calculation method and calculation module based on oxygen concentration change. The calculation method comprises the following steps of searching an oxygen concentration setting value under a current working condition from an oxygen concentration MAP graph based on a rotating speed n of an engine and the oil injection quantity q of a fuel injector under thecurrent working condition; acquiring oxygen concentration deviation according to an oxygen concentration actual value and the oxygen concentration setting value; searching a model correction coefficient fac under the current working condition from a model correction MAP graph based on the oxygen concentration deviation and the oil injection quantity q; and acquiring a corrected carbon loading model calculation value according to an original carbon loading model calculation value and the model correction coefficient fac. The calculation module comprises an information acquisition unit, an oxygen concentration setting value determining unit, an oxygen concentration deviation determining unit, a correction unit and a corrected carbon loading model calculation unit which all implement the above steps. According to the carbon loading calculation method and calculation module based on oxygen concentration change, the DPF accumulated carbon loading amount can be accurately calculated, properregeneration is facilitated, a DPF filter is protected from blockage and damage, and normal operation of a vehicle is ensured.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and in particular relates to a carbon load calculation method and a calculation module based on changes in oxygen concentration. Background technique [0002] The quality of oil products or diesel filters in the market is not up to standard, which will often lead to failures such as wear of injector holes, blockage of injection holes, and sticking of injectors; failures such as engine supercharger, air intake and intercooling pipeline leakage and blockage; these oils Any failure related to the gas circuit will cause the actual fuel injection volume or the actual intake air volume to change, thereby affecting the combustion, causing the soot emission in the engine exhaust to exceed or fall below the normal level (that is, causing the oxygen concentration in the engine exhaust to change). [0003] In the current control strategy, the change of the engine soot level c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N11/00F01N3/023
CPCF01N3/023F01N9/002F01N9/005F01N11/007F01N2560/025Y02T10/40
Inventor 秦春红于洪峰庄明超潘伟
Owner WEICHAI POWER CO LTD