Ford Global Technolgoies, LLC

Adam Krach

John Eric Rollinger

Sumanth Reddy Dadam

Robert Roy Jentz

Patrick Edward Smithberger

Edward Doemer

Andrew Paul Bagnasco

Michael Bastanipour

Sitaram Rejeti

Jose Francisco Martinez Leyva

Michael Scott Christensen

Douglas Raymond Martin

Nicholas Herhusky

Michael Casedy

Gladys Galicia

Rani Kiwan

Hassene Jammoussi

Matthew Carpenter

Tyler DeWine

Luis Juarez

Michiel Jacques Van Nieuwstadt

Adam Nathan Banker

Michael Howard Shelby

Alexander O'Connor Gibson

Amey Y Karnik

Adam J Richards

Peter John Grutter

Tyler Kelly

Allen Joseph Lehmen

Scott Steadmon Thompson

Eric A Luehrsen

Michael Joseph Giunta

Jamie Charles Hanshaw

Vinod Kumar Ravi

M Scott Christensen

Rob Ciarrocchi

Rommel Racelis

Katherine Jane Brewer

Nicholas Edward McCubbin

Michael Stephen Sweppy

Joshua Schumaker

Dave Hagner

Rohit Bhat

Kirk Pulay

Scott Richard Hughes

Richard Shimon

Aakash Puntambekar

Russell Senior

Erzabeth J Holcombe

Kathleen Arlow Grant

Derek Kempton Ward

Alex Fischer

Martin Kampe

Andrew Couzens

Jonathan Saville

David Wyman

Bill Courtney

Vaibhav Khanna

Peter Turpel

Hussein Saab

Methods and systems are provided for implementing a diagnostic technique for a positive crankcase ventilation (PCV) assembly. In one example, the method includes generating an estimated crankcase pressure at the location of a crankcase pressure sensor based on a nominal model and a faulted model of a PCV system that is generated by a controller. The method further includes diagnosing a PCV system component based on a difference between the estimated crankcase pressure and an input from the crankcase pressure sensor; and responsive to the crankcase pressure sensor having a faulted diagnosis, triggering a sensor degradation indicator.

Method and system for positive crankcase ventilation (PCV) diagnostics

A method and system for monitoring an exhaust gas sensor coupled in an engine exhaust is provided. In one example, the method determines an estimate of an exhaust gas oxygen sensor time constant according to a correlation between a rate of change of a Lambda value and a system time constant.

System and method for diagnosing an exhaust gas sensor

Methods and systems are provided for diagnosing a stuck Active Transmission Warmup (ATWU) valve. In one example, a method for an ATWU valve monitoring routine of a vehicle comprises determining a temperature difference between an engine coolant temperature (ECT) and a transmission fluid temperature (TFT) over a duration before the ATWU valve is commanded from a closed position to an open position or from the open position to the closed position comparing a rate of change of the TFT before and after the ATWU valve is commanded to the open position or the closed position; and indicating a stuck ATWU valve based on at least one of the temperature difference, the TFT rate of change comparison, or a combination thereof, based on a calibration parameter.

Systems and methods for diagnosing stuck ATWU valve

A method and system for monitoring an exhaust gas sensor coupled in an engine exhaust is provided. In one example, the method determines an estimate of an exhaust gas oxygen sensor time constant according to a comparison of air/fuel ratios and a system time constant.

Methods and systems are provided for EGR valve diagnostic. In one example, a method includes providing a correction to a position of the EGR valve to compensate for an altitude of the vehicle. The compensation is based on a comparison of a pressure ratio to a curve rationalized with a barometric pressure.

Methods and systems for EGR system

Methods and systems are provided for an exhaust gas recirculation (EGR) system. In one example, a method includes determining a present EGR valve offset and an historical EGR valve offset and comparing the present EGR valve offset and the historical EGR valve offset to determine a presence of an EGR leak.

Systems and methods for diagnosing operation of a transmission warm-up valve are presented. In one example, the transmission warm-up valve is commanded to an open position and an estimated transmission fluid temperature is compared to an actual transmission fluid temperature to determine whether or not the transmission warm-up valve is operating as commanded.

Methods and systems for diagnosing transmission warm-up valve

A vehicle includes an internal combustion engine having a plurality of cylinders, a sensor configured to generate a sensor signal correlated with an air-fuel ratio of first and second cylinders of the plurality of cylinders, and a controller in communication with the sensor and programmed to monitor the air-fuel ratio of the first cylinder in response to an indication that air-fuel ratio measurements of the first cylinder satisfy predetermined criteria for current engine operating conditions while air-fuel ratio measurements of the second cylinder do not satisfy the predetermined criteria for the current engine operating conditions.

Vehicle control with individual engine cylinder enablement for air-fuel ratio imbalance monitoring and detection

Systems and methods for determining which of an intake valve and an exhaust valve is to be deactivated first when an engine is operated in a variable displacement mode. In one example, an exhaust valve of the cylinder is deactivated before an intake valve of the cylinder when the engine is operated in a static variable displacement operating mode.

System and method for deactivating engine cylinders

Systems and methods for determining whether or not a temperature sensor is degraded are presented. In one example, a determination of degradation of the temperature sensor is based on a difference between a temperature determined from output of the temperature sensor and an estimate of a temperature of a pressure sensor.

Method and system for rationalizing a temperature within an engine system

Methods and systems are provided for diagnostics of exhaust gas recirculation (EGR) components including an EGR pressure sensor. In one example, a method for an exhaust gas recirculation (EGR) system of a vehicle comprises diagnosing an excessive EGR flow rate via an MAP-MAF strategy, the MAP-MAF strategy including estimating an EGR flow rate based on a difference between an output of a manifold absolute pressure (MAP) sensor of the vehicle and an output of a mass airflow (MAF) sensor of the vehicle; and in response to stable intrusive conditions being met, intrusively commanding an EGR valve of the EGR system to a closed position to confirm the diagnosed excessive EGR flow rate. If the excessive flow is detected after the EGR valve is commanded to the closed position, a diagnostic code may be set.

Method for detecting excessive EGR flow

Methods and systems are provided for diagnostics of exhaust gas recirculation (EGR) components including an EGR pressure sensor. In one example, a method may include comparing a current relationship between an output of the EGR pressure sensor and a manifold air pressure (MAP) and a pre-calibrated relation between the output of the EGR pressure sensor and the MAP to detect degradation of the EGR pressure sensor.

EGR system diagnostics

A method for monitoring a secondary airflow (SAIR) system in an engine includes determining degradation of the SAIR system adding a SAIR to downstream of an engine cylinder exhaust based on a comparison of the SAIR before and after a shutdown of a SAIR pump, the SAIR calculated from a fuel injection amount, an exhaust air-fuel ratio, and an engine intake airflow. In this way, SAIR at the exhaust manifold can be monitored utilizing existing onboard sensors and technology, thereby maintaining OBD and emissions monitoring, reducing engine emissions, and maintaining costs.

Systems and methods for operating an engine including a secondary air system

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.

Methods and systems for diagnosing non-deactivated valves of disabled engine cylinders

A method and a system for diagnosing positive crankcase ventilation (PCV) systems are disclosed. In one example, the method diagnoses a PCV system based on a pressure that may be observed during engine cranking. In another example, the PCV system is diagnosed during vehicle driving conditions after the engine exits cranking.

System and method for diagnosing a crankcase ventilation system

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Canton, MI, United States of America

Adam Krach