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US 2026/0063512 A1Published application
Diagnostic for oxygen sensors in dual exhaust paths
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Chris Paul Glugla
Life of this patent
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Abstract
Systems and methods for diagnosing operation of four oxygen sensors of an engine that includes crossover pipes are described. The four oxygen sensors may include a left cylinder bank upstream oxygen sensor, a right cylinder bank upstream oxygen sensor, a left cylinder bank downstream oxygen sensor, and a right cylinder bank downstream oxygen sensor.
Claims20
An oxygen sensor diagnostic method, comprising:
- via a controller, adjusting a first valve configured to adjust flow of exhaust through a first crossover pipe;
- and
- identifying degradation of a sole oxygen sensor in response to an operating state of the first valve and in response to output of a first outer loop fuel controller correction value.
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 left upstream oxygen sensor, the right upstream oxygen sensor, the left downstream oxygen sensor, and the right downstream oxygen sensor via adjusting operating states of the right valve, the left valve, and outputs of two outer loop fuel controllers generated via the controller.
10 more elements
An oxygen sensor diagnostic method, comprising:
- via a controller, identifying a presence or absence of oxygen sensor degradation for four oxygen sensors according to outputs of two outer loop fuel controllers and operating states of a first valve and a second valve.
Dependencies are inferred from the claim text.