Gm Global Technolgoy Operations, Inc.

Scott T Feldmann

Janean Kowalkowski

Yue-Yun Wang

Michael A Smith

Sai S V Rajagopalan

Etsuko Muraji Stewart

Pratap S Murthy

Vijay A Ramappan

Michael J Lucido

Donovan L Dibble

Timothy P Philippart

Chad E Marlett

Justin Adam Shetney

Robert Gallon

Jeffrey M Hutmacher

Klaus Pochner

Ronald Joseph Kubani

Zhong Li

Jon C Wasberg

Jason J Chung

Andrew A Raftopoulos

Randy L Dufresne

Uwe Steinmann

Kea Hyuk Chang

A system includes a fuel control module and a valve control module. The fuel control module controls a fuel injector to stop fuel delivery to each cylinder of an engine in a vehicle when the vehicle is decelerating. The valve control module controls a valve actuator to actuate intake and exhaust valves of each cylinder of the engine between open and closed positions when fuel delivery to each cylinder of the engine is stopped. The valve control module controls the valve actuator to adjust an amount of airflow through each cylinder of the engine to a minimum amount when fuel delivery to each cylinder of the engine is initially stopped. The valve control module controls the valve actuator to adjust the amount of airflow through each cylinder of the engine to an amount greater than the minimum amount before fuel delivery to each cylinder of the engine is restarted.

System and method for controlling airflow through cylinders of an engine during a deceleration fuel cutoff event

A system includes a three-way catalyst (TWC) sulfur load module, a cylinder/fuel cutoff module, a fuel control module, and a valve control module. The TWC sulfur load module is configured to determine an amount of sulfur deposited on a three-way catalyst of an engine in a vehicle. The cylinder/fuel cutoff module is configured to determine whether to enable deceleration cylinder cutoff (DCCO) based on the amount of sulfur deposited on the three-way catalyst. The fuel control module is configured to control a fuel injector to selectively stop fuel injection in the engine when DCCO is enabled. The valve control module is configured to selectively maintain intake and exhaust valves of the engine in a closed position when DCCO is enabled.

System and method for controlling amount of sulfur on three-way catalyst by limiting deceleration cylinder cut off

A control system of a vehicle includes: an electric motor configured to phase rotation of an camshaft of an engine relative to rotation of a crankshaft of the engine; a current module configured to, while the engine is off: selectively transition a current signal back and forth between a first state and a second state; and a motor driver module configured to, while the engine is off: apply power to the electric motor from a battery and adjust a position of the camshaft toward a predetermined position when the current signal is in the first state; and disconnect the electric motor from the battery and allow the position of the camshaft to move away from the predetermined position when the current signal is in the second state.

Cam phaser control systems and methods for engine off conditions

A method is provided for operating a three step camshaft system during engine position sensor fault conditions. The three step camshaft has multiple cam actuators each having an actuator pin. The method includes: disposing multiple camshaft barrels on a camshaft, each barrel having a slot receiving the actuator pin of a cam actuator during camshaft barrel rotation axially displacing each camshaft barrel to a high lift lobe position, a low lift lobe position and an active fuel management (AFM) lobe position; determining if an engine position sensor is in a fault condition; identifying if the fault condition occurs simultaneously with any of the camshaft barrels positioned in the AFM lobe position; energizing selected cam actuators in communication with the camshaft barrels positioned in the AFM lobe position to axially displace the camshaft barrel away from the AFM lobe position and to the low lift lobe position.

Three step cam defaulting strategy for engine position sensors

A method, control system, and variable valve timing system are provided for controlling an actuator that can be switched into an on state and an off state with pulse width modulation. The systems and method include controls configured to determine an actual system parameter on a first time schedule and a desired system parameter on a second time schedule. On a third time schedule, a position error difference between the actual system parameter and the desired system parameter is determined. The third time schedule is configured to begin and to determine the position error difference each time that the actual system parameter is determined and each time that the desired system parameter is determined. A desired duty cycle is determined, and a duty cycle command is sent to a pulse width modulation output unit.

Device and method for fast position control of a hydraulic actuator

A system according to the principles of the present disclosure includes a valve lift determination module and a fault detection module. The valve lift determination module determines valve lift based on at least one of a first period when a valve is open and N differences between a first value of a valve lift signal generated by a valve lift sensor when the valve is closed and a second value of the valve lift signal when the valve is open, wherein N is an integer greater than one. The fault detection module detects a fault in a valve actuator based on the valve lift.

System and method for measuring valve lift and for detecting a fault in a valve actuator based on the valve lift

A vehicle includes an engine, an exhaust system, an SCR device, upstream and downstream NOx sensors, and a controller. The controller is in electrical communication with the NOx sensors, and is configured for detecting a stuck-in-range fault condition of the downstream NOx sensor during a low exhaust flow condition. The controller detects the condition, receives the upstream and downstream NOx levels from the respective upstream and downstream NOx sensors, and compares these levels to a zero or near-zero threshold when the low exhaust flow condition is active. The controller is also configured for executing a first control action when the upstream NOx level is below the threshold and the downstream NOx level exceeds the threshold, and executing a second control action when neither of the levels exceeds the threshold. A method is also disclosed for diagnosing the stuck-in-range condition.

Nitrogen oxide sensor stuck-in-range diagnostic tool

A method that includes in-vehicle systems and practices for determining whether a NOx sensor in an exhaust stream is performing properly.

Offset and slow response diagnostic methods for NOx sensors in vehicle exhaust treatment applications

A method and apparatus for controlling a diagnostic module for an exhaust gas sensor in a vehicle is provided. The exhaust gas sensor is located in an exhaust pathway in the vehicle. The diagnostic module may be configured to perform a signal range verification of an oxygen sensor portion of the exhaust gas sensor. A controller is operatively connected to the exhaust gas sensor and to the vehicle engine. The controller disables the diagnostic module when one or more entry conditions are satisfied. The entry conditions may include requiring the engine speed to be greater than a fuel cut-off threshold, the fuel cut-off threshold being the engine speed at which the fuel to the engine is terminated. The entry conditions may include: no fuel being delivered to the engine; and a vehicle exhaust brake mode being activated such that the exhaust pathway from the engine is obstructed.

Method and apparatus for controlling a diagnostic module for an exhaust gas sensor

A vehicle includes an engine having an exhaust port, an exhaust system for conditioning an engine exhaust stream, a nitrogen oxide (NOx) sensor positioned within the exhaust stream, and a controller. The controller has an out-of-range diagnostic tool for evaluating a range performance of the sensor. The controller detects a predetermined engine-on fuel shutoff event, and then temporarily disables the diagnostic tool during the fuel shutoff event. The fuel shutoff event may be a vehicle deceleration-based event. A selective catalytic reduction (SCR) device may be positioned within the exhaust system, with at least one NOx sensor positioned at the outlet of the SCR device. An additional NOx sensor may be positioned in proximity to the exhaust port. A method for use aboard the above vehicle includes detecting the engine-on fuel shutoff event via the controller, and temporarily disabling the diagnostic tool for the duration of the detected fuel shutoff event.

System and method for controlling a nitrogen oxide sensor

A method of diagnosing vehicle NOx sensor faults that includes sensing that an exhaust gas recirculating (EGR) valve is closed and that fuel flow to a vehicle engine is above a predetermined rate using an electronic control unit (ECU) located on a vehicle; recording the output received from an NOx sensor relative to an amount of fuel consumption over a period of time using the ECU; calculating the mean of the NOx sensor output relative to fuel consumption recorded over the period of time using the ECU; performing a least-squares estimation (LSE) using the ECU for more than one calculated mean based on an expected NOx sensor output; generating a NOx sensor gain for the NOx sensor using the ECU based on the LSE; and determining whether the NOx sensor gain is above or below a predetermined threshold.

Gain/amplitude diagnostics of NOx sensors

A method of monitoring a sensor of an exhaust system is provided. The method includes evaluating humidity of air entering the exhaust system; and monitoring operation of a sensor in the exhaust system based on the humidity.

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South Lyon, MI, United States of America

Scott T Feldmann