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US 12,372,022 B1Granted
Exhaust system valve diagnostics
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Michiel J. Van Nieuwstadt, Chris Paul Glugla
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Abstract
Systems and methods for diagnosing operation of valves that control exhaust flow through crossover pipes are described. In one example, the diagnostics may be based on output of upstream and downstream oxygen sensors. In particular, correlation between output of an upstream oxygen sensor and a downstream oxygen sensor may be indicative of a valve not being in an expected position.
Claims8
An engine system, comprising:
- an engine including a left cylinder bank and a right cylinder bank;
- a right cylinder bank exhaust system coupled to the right cylinder bank;
- a left cylinder bank exhaust system coupled to the left cylinder bank;
- a right to left crossover pipe coupling the right cylinder bank exhaust system to the left cylinder bank exhaust system;
- a left to right crossover pipe coupling the left cylinder bank exhaust system to the right cylinder bank exhaust system;
- a right valve positioned along the right cylinder bank exhaust system;
- a left valve positioned along the left cylinder bank exhaust system;
- a left upstream oxygen sensor;
- a right upstream oxygen sensor;
- a left downstream oxygen sensor;
- a right downstream oxygen sensor;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to diagnose operation of the right valve and the left valve via a correlation coefficient generated via outputs of at least one of the left upstream oxygen sensor, the right upstream oxygen sensor, the left downstream oxygen sensor, and the right downstream oxygen sensor.
10 more elements
Dependencies are inferred from the claim text.