Gm Global Technolgoy Operations, Inc.

Ford Global Technolgoies, LLC

Delphi Technologies, Inc.

Chrysler Group LLC

Andrew Paul Bagnasco

Mario Anthony Santillo

Adam Krach

Allen B Rayl, Jr

Jonathan T Shibata

Raymond Claude Turin

Jose Francisco Martinez Leyva

Tyler DeWine

Hassene Jammoussi

Joshua D Cowgill

Kenneth J Cinpinski

Joseph R Dulzo

Ian J Macewen

Steven Ward Majors

Gladys Galicia

Joseph Norman Ulrey

Robert Roy Jentz

Jun-Mo Kang

Michael James Uhrich

Mrdjan J Jankovic

Sanjeev Manubhai Naik

Vijay A Ramappan

Ronald Jay Pierik

Rani Kiwan

Michael Igor Kluzner

Craig D Marriott

Kenneth John Behr

Sergio E Garcia

Zhijian James Wu

Sergio Quelhas

Yue-Ming Chen

Gregory J York

Michael Casedy

Scott R Jeffrey

Liyun Zheng

Matthew A Wiles

Sitaram Rejeti

Peter Kafarnik

Patrick Edward Smithberger

Edward George Himes

Michael J Steckler

Joshua Schumaker

Krishnendu Kar

Thomas J Majcher

Christopher Weber

Paul Raymond Willette

Edward Fredericks

Derk Geurts

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

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.

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

A method and system for monitoring an exhaust gas sensor coupled in an engine exhaust is provided. In one example, the method adjusts an estimate of an exhaust gas oxygen sensor delay time based on a fuel injection ramping time. The fuel injection ramping time compensates for fuel that is injected to the engine while the engine enters or exits a fuel cut-off mode.

System and method for exhaust gas sensor monitoring

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 enabling diagnostics of an exhaust catalyst regardless of a level of oxygen stored in the catalyst. In one example, a method may include initiating diagnostics of the catalyst in response to an oxygen sensor coupled downstream of the catalyst recording a measurement that crosses a stoichiometric air-fuel ratio output more than a threshold number of times.

Methods and systems for catalyst monitoring enablement

Systems and methods for operating an engine that includes an oxygen sensor and one or more fuel injectors for each engine cylinder are described. In one example, lines describing a relationship between a fuel mass multiplier and a coefficient of a function describing output of an oxygen sensor to a step change in fuel mass are a basis for determining air-fuel imbalance of engine cylinders.

Methods and system for determining engine air-fuel ratio imbalance

Methods and systems are provided for diagnosing the presence or absence of a catalyst substrate within a catalyst can or housing. The methods and systems described a persistence of excitation metric that is a basis for judging whether or not the catalyst can is empty. If it is determined that the catalyst can or housing is empty, mitigating control actions may be performed via a controller.

Method and system for improving detecting an empty catalyst housing

Methods and systems are provided for diagnosing operation of a catalyst in the presence of oxygen sensor degradation over a vehicle life cycle. The methods and systems described herein filter the output of one oxygen sensor according to a time constant of a different oxygen sensor so that determination of a catalyst index ratio is compensated for oxygen sensor degradation.

Method and system for improving diagnosis of a catalyst

Methods and systems are provided for differentiating an exhaust air leak from a catalyst monitor sensor degraded with a slow-response. In one example, a pressure proximate an exhaust system particulate filter less than a threshold pressure may indicate an exhaust air leak and responsive to the indication of the exhaust air leak, the thresholds for monitoring the catalyst monitor sensor response may be adjusted. In this way, the impact of an exhaust air leak on catalyst monitor output may be accounted for so that subsequent monitoring for threshold catalyst may continue to be performed accurately in the presence of an exhaust air leak.

Systems and methods for detecting exhaust air leak

Fueling to one cylinder of an engine is selectively adjusted based on a correction associated with the cylinder. An instability module increments a counter value when the correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values. The instability module selectively generates a first indicator based on the counter value. A variance of imbalance values can be determined based on samples of an exhaust gas oxygen signal. Two variances are determined: one variance with adjustment based on the correction, one without adjustment based on the correction. A variance checking module selectively generates a second indicator based on the first and second variances. A re-synchronization module re-synchronizes the imbalance values with the cylinders, respectively, in response to generation of the first indicator and/or the second indicator.

Imbalance re-synchronization control systems and methods

A system according to the principles of the present disclosure includes a timing control module and a diagnostic module. The timing control module controls engine valve timing by sending fluid to an advancing chamber of a cam phaser to adjust the cam phaser to an advanced position and by sending fluid to a retarding chamber of the cam phaser to adjust the cam phaser to a retarded position. The diagnostic module identifies a fault in a variable valve lift (VVL) mechanism based on a first difference between an advancing pressure of the advancing chamber and a retarding pressure of the retarding chamber.

Diagnostic system and method for a variable valve lift mechanism

A technique can include receiving, at a controller for a vehicle, the controller including one or more processors, a signal indicative of a pressure in an intake manifold of an engine of the vehicle. The vehicle can include a supercharger configured to supply pressurized air to the intake manifold. The supercharger can be driven by a crankshaft of the engine via a belt. The technique can include estimating, at the controller, a frequency of the signal to obtain an estimated frequency. The technique can include determining, at the controller, whether the belt is slipping based on a comparison between the estimated frequency and a predetermined frequency. The technique can also include outputting, at the controller, a notification when the belt is determined to be slipping.

Techniques for detecting supercharger belt slip

A control system for an engine is presented. The control system can include a transition period waveform monitor module, a stuck fuel injector detection module, and a fuel injection control module. The transition period waveform monitor module measures an electrical signal of a fuel injector upon deactivation of the fuel injector. The stuck fuel injector detection module detects a stuck fuel injector when an accumulated deviation of the electrical signal from a parameterized estimated reference waveform is outside of a predetermined range. The fuel injection control module controls fuel injection in the engine based on the detection of the stuck fuel injector.

System and method for detecting a stuck fuel injector

A system for diagnosing a switchable roller finger follower (SRFF) and an oil control valve (OCV) includes a signal monitoring module and a fault detection module. The signal monitoring module receives at least one of an individual cylinder fuel correction (ICFC) signal and an air/fuel ratio imbalance (AFIM) signal when: an engine speed signal is within a predetermined range of speed; an engine load signal is within a predetermined range of load; and a charcoal canister vapor signal is within a predetermined range of flow rate. The fault detection module detects a fault of at least one of a SRFF and an OCV based on an exhaust gas recirculation value and at least one of the ICFC and AFIM signals. The ICFC and AFIM signals are generated based on: an engine position signal; and at least one of an oxygen signal and a wide range air fuel signal.

Systems and methods for diagnosing valve lift mechanisms and oil control valves of camshaft lift systems

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Plymouth, MI, United States of America

Andrew Paul Bagnasco