Method for detecting a malfunction of a differential pressure sensor or a pressure sensor pair

DE102020214627B4Active Publication Date: 2026-07-23VOLKSWAGEN AG
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Patent Information

Application Number
DE102020214627
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-11-20
Publication Date
2026-07-23
Estimated Expiration
2040-11-20

AI Technical Summary

Technical Problem

Existing methods for detecting malfunctions in differential pressure sensors or pressure sensor pairs, such as blockages, icing, leaks, or hose swaps, are inadequate, leading to potential damage to vehicle components like particle filters and turbochargers due to incorrect pressure measurements.

Method used

A method that utilizes a differential pressure signal and a reference differential pressure signal, based on a reference model, to detect malfunctions by calculating gradients and integrals of these signals, and checking for conditions like hose swaps or pressure sensor interchanges, ensuring accurate pressure measurements.

Benefits of technology

This method effectively identifies malfunctions in differential pressure sensors, preventing damage to vehicle components by ensuring correct pressure readings and maintaining the integrity of the measurement system.

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Abstract

Method for detecting a malfunction of a differential pressure sensor (115) or a pressure sensor pair (214, 215) based on a differential pressure signal (Δp(t)) of the differential pressure sensor (115) or the pressure sensor pair (214, 215) and a reference differential pressure signal (pr(t)) to detect a malfunction of the differential pressure sensor (115) or the pressure sensor pair (214, 215), wherein the detection of a malfunction further comprises calculating (S407, S503) a gradient of the differential pressure signal (dΔp(t)) and calculating a gradient of the reference differential pressure signal (dpr(t)), forming a first integral value (I(dpr)) by integrating the gradient of the reference differential pressure signal (dpr(t)) over a time interval (T) and forming a second integral value (I(dΔp)) by Integrating the gradient of the differential pressure signal (d&Dgr;p(t)) over the time interval (T), comparing the first integral value (I(dpr)) with a first threshold (c1) and the second integral value (I(d&Dgr;p)) with a second threshold (c2), detecting a malfunction if the first integral value (I(dpr)) exceeds the first threshold (c1) and the second integral value (I(d&Dgr;p)) does not exceed the second threshold (c2), and outputting a success message or an error message in the error memory management depending on the result of the malfunction detection.;
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Citation Information

Patent Citations

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    DE102014209718A1

  • Method for determining the state of at least one line

    DE102017010511A1

  • Method and device for diagnosing a differential pressure sensor of a particulate filter

    DE102017220130A1

  • Method and device for diagnosing a differential pressure sensor of a particulate filter

    DE102017222313A1

  • Method for verifying the plausibility of a pressure sensor

    DE102018215195A1