Automotive Sensor Offset Diagnostic System

DE102021110311B4Active Publication Date: 2026-07-02GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
GM GLOBAL TECHNOLOGY OPERATIONS LLC
Filing Date
2021-04-22
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Current NOx sensor diagnostics in vehicles face challenges such as false failures due to ammonia slip during transient conditions, especially with missing SCR catalysts, and limited availability of time for diagnostics during deceleration, leading to compromised performance and non-compliance with emission standards.

Method used

A vehicle sensor offset diagnostic system that performs diagnostics during low-noise conditions, such as engine idle or after-run, using an incremental x/y approach or integral approach to compare NOx sensor readings with a model or table of expected values, and applies diagnostic criteria to ensure robustness.

Benefits of technology

The system enhances the robustness of NOx sensor diagnostics, improving compliance with emission limits and reducing false failures, thereby ensuring more accurate SCR efficiency and lower emission levels.

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Abstract

Motor vehicle sensor offset diagnostic system (10), comprising: an engine (12); an exhaust system (14) connected to the engine (12); at least one sensor (26) that detects a condition of the exhaust system (14); and an electronic control module (16) that receives sensory signals from the at least one sensor (26); wherein the electronic control module (16) is configured to perform a diagnostic run to identify states of the at least one sensor (26) in a low-noise state; wherein the at least one sensor (26) further defines a NOx sensor (34) for a selective catalytic reduction (SCR) catalyst (36) that monitors a state of the SCR catalyst (36); wherein the automotive sensor offset diagnostic system (10) is configured to compare a signal from the NOx sensor (34) with a NOx model directly or with a scalar / map or table of expected NOx at an idle state;and wherein the diagnostic run can be performed using an incremental x / y approach, comprising: Receiving a NOx sensor value (88) defining an x-value; Retrieving an offset value (90) defining a y-value, wherein the offset value (90) defines either a NOx model value (92) or an expected NOx value (94) in a table of expected NOx values; Subtracting the NOx model value (92) or the expected NOx value (94) from the NOx sensor value (88) to identify a real offset value (100); and Identifying whether the real offset value (100) is greater than a predetermined offset threshold value (104); where: if the actual offset value (100) is greater than the predetermined offset threshold (104), the x and y values ​​are incremented in one increment step until both values ​​meet predetermined calibrated values;or if the actual offset value (100) is not greater than the predetermined offset threshold value (104), only the y-value is incremented.;
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