Methods and systems for diagnosing non-deactivated valves of disabled engine cylinders
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United States of America Patent
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Jan 24, 2023
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Jan 25, 2022
filing date -
Jan 25, 2022
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Abstract
Methods and systems are provided for a diagnostic routine of a variable displacement engine (VDE) of a vehicle to detect non-deactivated valves of deactivated cylinders due to a degraded valve deactivation mechanism. In one example, a method comprises, during operation of the VDE with one or more cylinders of the VDE deactivated, calculating a variation in a fast-sampled signal outputted by one or more exhaust gas oxygen (EGO) sensors of the VDE over a plurality of engine cycles; determining that the variation is greater than the threshold variation; and in response, indicating that valves of the one or more cylinders are not deactivated. A second method comprises estimating a throttle air flow rate and an engine air flow rate of the VDE; and indicating non-deactivated valves of one or more deactivated cylinders if the throttle air flow rate exceeds the engine air flow rate by a threshold.
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Patent Owner(s)
- FORD GLOBAL TECHNOLOGIES, LLC
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- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Grant, Kathleen | Farmington Hills, US | 3 | 60 |
Hughes, Scott Richard | Bloomfield Hills, US | 4 | 39 |
Kiwan, Rani | Canton, US | 46 | 47 |
Krach, Adam | Canton, US | 16 | 8 |
Shimon, Richard | Troy, US | 4 | 61 |
Wyman, David | Dearborn, US | 8 | 119 |
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