Particulate filter pressure differential detection method and apparatus

By correcting the phase difference between upstream and downstream pressure waveforms using engine speed and exhaust parameters, the method improves the accuracy of pressure difference measurement across particulate filters, enhancing the control of regeneration and maintenance processes.

JP7740542B2Active Publication Date: 2025-09-17NISSAN MOTOR CO LTD
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Patent Information

Application Number
JP2024524091
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-06-02
Publication Date
2025-09-17
Estimated Expiration
2042-06-02

AI Technical Summary

Technical Problem

Existing methods for detecting pressure differences across particulate filters in internal combustion engines fail to account for the phase difference between upstream and downstream pressure waveforms, leading to reduced accuracy in measuring pressure differences due to differing passage lengths in sensor pipes.

Method used

Correct the phase difference between upstream and downstream pressure waveforms by adjusting the detection values using a phase correction time based on engine speed and optionally exhaust gas temperature and flow rate, allowing for accurate calculation of the pressure difference across the particulate filter.

Benefits of technology

Enhances the accuracy of estimating particulate filter clogging and damage by reducing the phase-induced pressure difference, thereby improving the control of regeneration processes and filter maintenance.

✦ Generated by Eureka AI based on patent content.

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Abstract

An exhaust passage (14) of an internal combustion engine (1) is provided with a particulate filter (15). An upstream-side pressure sensor (16A) which detects the upstream-side pressure (Pin) of the particulate filter (15) and a downstream side pressure sensor (16B) which detects the downstream side pressure (Pout) of the particulate filter (15) are provided. Control of a regeneration treatment and the like are performed on the basis of an upstream / downstream pressure difference which is the difference between the upstream-side pressure and the downstream-side pressure. In order to reduce the phase difference between waveforms of both of the pressures based on an exhaust pulsation, a phase correction time (Δt) is calculated on the basis of the engine rotation speed (Ne), and, with regard to the upstream-side pressure (Pin), a pressure detection value which precedes by the phase correction time (Δt) is set as a corrected upstream-side pressure (Pinh) (S3 and S4). Then, the corrected upstream-side pressure (Pinh) and the downstream-side pressure (Pout) are used to calculate a corrected upstream / downstream pressure difference (DP) (S6).
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Citation Information

Patent Citations

  • Exhaust emission control device for engine

    JP2002371827A

  • State detection device for particulate filter

    JP2007292013A

  • Micro-particle capturing filter condition detection device

    WO2013005456A1