Ford Global Technolgoies, LLC

David Robert Nader

Michael Igor Kluzner

Robert Joseph Jerger

Christopher Kirk Davey

Brien Lloyd Fulton

Paul Martin Niessen

Jason Ronald Smith

David Curtis Ives

Dean Pennala

Gopal Krishna Chamarthi

Michael John Cullen

Michael James Uhrich

Frank M Korpics

Michael Daniel Shane

Ziad Zaghati

Michiel Jacques Van Nieuwstadt

Robert Roy Jentz

Jeffrey Scott Hepburn

Devesh Upadhyay

Kenneth John Behr

James Matthew Kindree

Donald Fenwick Dickison

Chris Riffle

Paul Raymond Willette

Robert Sarow Baskins

Robert Eloy Gonzales

Anand J Shah

A method for operating a turbocharged engine is disclosed. In one example, during a first condition an engine operation is adjusted in response to a turbocharger expansion ratio exceeding a first limit and during a second condition an engine operation is adjusted in response to the turbocharger expansion ratio exceeding a second limit that differs from the first limit. Degradation of the engine may be reduced under some engine operating conditions by adjusting engine operation in response to the turbocharger expansion ratio.

Method and system for limiting output of a boosted engine

Various systems and methods are described for detecting ammonia slip. In one example method, an exhaust system with two NOx sensors uses transient responses of the NOx sensors to allocate tailpipe NOx sensor output to NOx and NHlevels therein. An ammonia slip detection counter with gains is included that determines a probability of NOx and NHbased on the measured sensor activities that are further processed by a controller to adjust one or more parameters based on the allocation and changes of sensor output.

Enhanced real-time ammonia slip detection

A method for diagnosing a performance issue in a vehicle system having a diesel engine, a fuel system, and an on-board diagnostic system. The method includes cranking the engine, and, if a pressure sensed in the fuel system during or after the engine cranking differs by a threshold amount from the pressure sensed during a previous operation of the engine, indicating excessive fuel viscosity in the on-board diagnostic system.

Detection of diesel fuel gelling

A method for operating a turbocharged engine is disclosed. In one example, an engine operation is adjusted in response to a turbocharger expansion ratio. Degradation of the engine may be reduced under some engine operating conditions by adjusting engine operation in response to the turbocharger expansion ratio.

A system for determining a temperature of exhaust gases from an engine is provided. The system includes an exhaust gas sensor having an electric heating coil. The sensor communicates with exhaust gases from the engine. The system further includes an electrical circuit for generating a signal indicative of the resistance of the heating coil when the coil is not energized. Finally, the system includes a controller receiving the signal and calculating the temperature of the exhaust gases based on the signal.

Exhaust gas temperature measurement utilizing an exhaust gas sensor

A method for determining the effectiveness of a catalyst to remove emissions from the exhaust of an internal combustion engine. The method includes measuring an upstream time history of a signal produced by an exhaust gas oxygen sensor upstream of the converter and a time history of an exhaust gas oxygen sensor disposed downstream of the converter. The time histories vary between a lean air-fuel ratio signal level and a rich air-fuel ratio signal level. A time delay is determined between the upstream time history and the downstream time history during transitions in such time histories from the lean air-fuel ratio signal level to the rich air-fuel ratio signal level. The determined time delay is compared with a reference time delay to determine the efficiency of the converter. The converter is determined to be ineffective if the converter as been determined to be potentially ineffective and the time delay is determined to be less than the reference time delay.

On-board diagnostic catalyst monitoring system

A method of determining the type of fuel being burned in an engine by analyzing the signal provided by a exhaust gas oxygen sensor signal is disclosed. The determination is based on the ratio of the value of certain characteristics of the signal during the lean and rich portions of the signal.

Method and apparatus for inferring fuel mixture

A control system and method for controlling an engine ( ) of an automotive vehicle having a catalyst ( ) and controller ( ) is set forth herein. The controller ( ) is configured to determine a first exhaust flow rate and a second exhaust flow rate based on a flow rate of the exhaust gases. The controller is further configured to determine a first temperature (T1) of exhaust gases associated with the first exhaust flow rate based on a steady state temperature and an amount of heat transferred from the exhaust gases associated with the first exhaust flow rate to an exhaust system. The controller is further configured to determine a second temperature of exhaust gases associated with the second exhaust flow rate based on the steady state temperature. The controller is further configured to determine the catalytic converter temperature based on the first temperature and the second temperature.

Method and apparatus for determining a temperature of an emission catalyst

A method for determining the effectiveness of a catalyst having both first, relatively high oxidizable material provided to remove emissions from the exhaust of an internal combustion engine and a second, relatively low oxidizable material provided to remove emissions from such exhaust. The method includes measure a difference in oxygen content upstream and downstream of the catalyst while the engine is producing the exhaust to determine the effectiveness of the first material and determining the effectiveness of the second material by comparing time delay in a property of the exhaust as such exhaust passes through the catalyst. In one embodiment, the property of the exhaust is the oxygen content in such exhaust. In one embodiment, the effectiveness of the second material is measured after the first material is determined to be ineffective.

A catalytic monitoring method for an engine having two engine banks of which each coupled to one of two catalytic converters using first and second exhaust gas oxygen sensors respectively, upstream and downstream of one catalytic converter. Third and fourth exhaust gas oxygen sensors are respectively coupled upstream and downstream of the other catalytic converter. Switch ratios are determined for each of the engine banks based on the switching ratios of each upstream and downstream pair of exhaust gas oxygen sensors. A combination of the switch ratios is used to determine overall catalytic converter system performance.

Catalytic monitoring method

Method and system are provided for monitoring performance of a catalytic converter coupled to an exhaust of an internal combustion engine supplied with fuel from a fuel tank where the fuel can include a first fuel and second fuel in concentrations that vary from one refueling to the next. A ratio indicative of catalytic converter exhaust gas conversion efficiency is determined from signals provided by an exhaust gas sensor disposed upstream and an exhaust gas sensor disposed downstream relative to the catalytic converter, and a ratio threshold value indicative of a malfunctioning catalytic converter is adjusted in dependence on the concentration of one of the first fuel and second fuel in the fuel in the fuel tank.

Method for catalyst monitoring using flex fuel

A method of detecting catalytic converter deterioration based on the ratio of the arc length or the number of transitions of signals from sensors upstream and downstream of the converter where ratio determination is restricted to predefined air mass ranges within corresponding predefined engine speed/load ranges in order to avoid areas of engine speed and load instability that might impair test to test repeatability of the deterioration detection.

Method and system for monitoring a catalytic converter

A catalytic monitoring method for an engine having two engine banks of which each coupled to one of two catalytic converters using first and second exhaust gas oxygen sensors, respectively upstream and downstream of one catalytic converter. Third and fourth exhaust gas oxygen sensors are respectively coupled upstream and downstream of the other catalytic converter. Switch ratios are determined for each of the engine banks based on the switching ratios of each upstream and downstream pair of exhaust gas oxygen sensors. A combination of the switch ratios is used to determine overall catalytic converter system performance.

EGR system for an internal combustion engine (105) comprises an EGR valve (150) disposed in an EGR recirculation conduit (125) involves estimating exhaust gas temperature at an engine exhaust manifold. An exhaust gas temperature drop between the exhaust manifold and the EGR valve is estimated and a time constant is determined that models the exhaust gas temperature as a function of EGR mass flow rate so that exhaust gas temperature at the EGR valve can be estimated by adjusting the estimated exhaust gas temperature at the exhaust manifold by the exhaust gas temperature drop and the time constant.

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Farmington Hills, MI, United States of America

David Robert Nader