Method and system for diagnosing a four-gas sensor system
By applying a combination of stoichiometry and rich/lean air-fuel ratio modes in the engine cylinder, oxygen sensor diagnosis is simplified and accelerated, solving the problems of long diagnosis time and complexity of multi-sensor systems, and improving production efficiency and the accuracy of air-fuel ratio control.
CN122190919APending Publication Date: 2026-06-12FORD GLOBAL TECH LLC
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FORD GLOBAL TECH LLC
- Filing Date
- 2025-12-04
- Publication Date
- 2026-06-12
AI Technical Summary
Technical Problem
In the existing technology, the process of diagnosing multiple oxygen sensors is complex and time-consuming, which leads to reduced production efficiency on vehicle assembly lines and increases the complexity of the system.
Method used
By generating a combination of stoichiometry, rich air-fuel ratio, or lean air-fuel ratio in different cylinders of the engine and performing oxygen sensor diagnostics at multiple time intervals, the amount of time required to evaluate the oxygen sensor is reduced, simplifying the diagnostic process.
Benefits of technology
It achieves shorter oxygen sensor diagnostic time, reduces diagnostic complexity, allows for efficient catalytic converter operation, and improves the accuracy of air-fuel ratio control.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122190919A_ABST
Abstract
The invention provides "Methods and systems for diagnosing four oxygen sensor systems". Systems and methods for evaluating operation of a plurality of upstream and downstream oxygen sensors are disclosed. In one example, air fuel mode arrangements can be sequenced to reduce the amount of time required to evaluate upstream and downstream oxygen sensors. Oxygen sensor evaluation can be suitable for detecting sensor wiring errors and sensor degradation.
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