Differential pressure pipeline icing delayed diagnostic method for gasoline engine particulate filter

A particle trap and diagnostic method technology, which is applied in the field of icing delay diagnosis of the differential pressure pipeline of the gasoline engine particulate trap, can solve problems such as blockage, abnormal pressure differential measurement value, misdiagnosis, etc., and achieve high accuracy and reference The effect of value, high accuracy, and simplified calculation difficulty

Active Publication Date: 2019-11-19
DONGFENG MOTOR CORP HUBEI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, gasoline engines use particulate filter (GPF Gasoline Particle FilThr) to deal with particulate matter emissions, but GPF, especially chassis-type GPF, when it works at a temperature below 0°C, exhaust moisture accumulates during operation and shuts down due to moisture condensation on the pressure. The differential pipeline channel will become clogged over time, resulting in abnormal differential pressure measurement values. If the differential pressure value in this state is used to diagnose the differential pressure sensor, a misdiagnosis will occur.

Method used

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  • Differential pressure pipeline icing delayed diagnostic method for gasoline engine particulate filter
  • Differential pressure pipeline icing delayed diagnostic method for gasoline engine particulate filter

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Embodiment 1

[0084] Icing will only occur during parking. When the actual ambient temperature Th is less than the freezing temperature set point T1 and the time exceeds t1, it is considered that the differential pressure pipeline of the particulate filter may be icing. If there is a possibility of icing, Then it enters the judgment of melting ice state, where the cumulative calculation time t1 starts to accumulate only after the latest shutdown, if the vehicle is started and then stops, the cumulative time will be restarted from zero after the temperature condition is met, such as the T1-t1 two-dimensional table As shown, for the judgment of the ambient temperature T1, when the ambient temperature is equal to -20°C, the pipeline may freeze after the vehicle stops for 240 minutes, if it is at -25°C, then after (180+240) / 2 parking time There is a possibility of pipeline freezing, and so on, and the meanings of Table 2 and Table 3 are similar.

Embodiment 2

[0086] In the case of judging that the pipeline is icing, whether to melt the ice or not needs to be judged from two steps: the natural ice melting of the environment and the exhaust heating and melting of the ice. The vehicle engine ECU monitors the ambient temperature. The speed of ice will be different, and the speed of melting ice will be slower as the ambient temperature is lower. Such as the T2-t2 two-dimensional table, which can accurately describe the ice-melting time at different temperatures, t2 only starts to accumulate time when the temperature is higher than the minimum temperature in Table 2 (such as 10°C in the example) after the shutdown state, once the vehicle starts or the temperature If the temperature is lower than T2, the time will be accumulated again from zero after the temperature condition is met, and the non-icing flag will be true when the ice melting is judged to be completed, and the judgment of the exhaust temperature in the next step will be enter...

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Abstract

The invention relates to the technical field of automobile control and particularly relates to a differential pressure pipeline icing delayed diagnostic method for a gasoline engine particulate filter. A differential pressure value is monitored, the environment temperature Th, the exhaust temperature Tp, the parting duration and the starting duration data are collected at the same time and compared with a T1-t1 two-dimensional table and/or T2-t2 two-dimensional table and/or a T3-t3 two-dimensional table, and whether a differential pressure pipeline of a vehicle is iced or not is judged; when the practically-measured differential pressure value exceeds a given upper limit value or a given lower limit value and if it is judged that the differential pressure pipeline is iced, fault alarming of a differential pressure sensor is delayed; if it is judged that the differential pressure pipeline is not iced, fault alarming of the differential pressure sensor is carried out immediately; and thevehicle can judge the icing condition of the differential pressure pipeline icing at different parking environment temperatures according to practical environment conditions so as to avoid error diagnosis to the differential pressure sensor when the differential pressure pipeline is blocked.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a method for diagnosing the icing delay of a differential pressure pipeline of a gasoline engine particulate trap. Background technique [0002] At present, gasoline engines use particulate filter (GPF Gasoline Particle FilThr) to deal with particulate matter emissions, but GPF, especially chassis-type GPF, when it works at a temperature below 0°C, exhaust moisture accumulates during operation and shuts down due to moisture condensation on the pressure. The differential pipeline channel will become blocked over time, resulting in abnormal differential pressure measurement values. If the differential pressure value in this state is used to diagnose the differential pressure sensor, a misdiagnosis will occur. Contents of the invention [0003] The object of the present invention is to aim at the defects of the prior art, and provide a method for diagnosing delayed icin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08F01N11/00
CPCF01N11/002F02B77/08Y02T10/40
Inventor 陈龙龙永生李儒龙王伟程晓军
Owner DONGFENG MOTOR CORP HUBEI
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