Gm Global Technolgoy Operations, Inc.

Other

Stephen Paul Levijoki

John W Siekkinen

Christopher E Whitney

Yue-Yun Wang

David N Hayden

Brett B Thompson

James M Perrin

Scott R Jeffrey

Michael John Dokter

Janean Kowalkowski

Paul Jasinkiewicz

Justin Adam Shetney

Cheryl Jeanette Stark

Scott R Gordon

Eric E Klauser

Thomas J Majcher

Anthony H Heap

Igor Anilovich

Layne K Wiggins

John F Van Gilder

James L Worthing

Charles Solbrig

Chaitanya Sankavaram

Rebecca J Darr

Shiming Duan

Shouxian Ren

J Michael Gwidt

Robert J Genslak

Eric M Hall

Gary Robert Cygan, Jr

Michele Bilancia

Steve L Melby

John Coppola

Christopher Harold Knieper

Morena Bruno

Daniel A Bialas

Bin Xu

Dean G Sorrell

Edward Stuteville

Bradley C Gibson

Jeffry A Helmick

Pulasti Bandara

Nicola Pisu

Paul William Rasmussen

Todar Kuzmanov

Nicholas Sup

Robert E Heger

Gionata Cimini

Damon Grimwood

A method of controlling intake and exhaust cam phase in an internal combustion engine includes sensing an engine speed and an engine load of the internal combustion engine, sensing or estimating a wall temperature of a cylinder of the internal combustion engine, utilizing the engine speed and the engine load in one or more lookup tables based on the cylinder wall temperature to determine intake phaser constraint values and exhaust phaser constraint values for cold operation of the internal combustion engine, and transitioning the intake phaser constraint values and the exhaust phaser constraint values for cold operation to intake phaser constraint values and exhaust phaser constraint values based on one or more lookup tables for normal hot operation of the internal combustion engine.

Method of cam phase control based on cylinder wall temperature

A vehicle throttle control system includes a torque control system providing a desired torque for a throttle valve. A conversion module converts the desired torque to a desired throttle area and converts the desired throttle area to a target throttle position. A selection module determines which one of multiple MPC controllers should be used based on a current position of the throttle valve. A prediction module determines future state values using a mathematical model of a throttle body. A cost module determines a first cost for a first set of MPC target throttle duty cycle values. A control module identifies optimal sets of target throttle motor duty cycle values for each of the MPC controllers. The multiple MPC controllers control operation of a throttle valve duty cycle to achieve a target throttle opening area based on a first one of the target throttle motor duty cycle values.

Electronic throttle control using model predictive control

A method to determine reference actuator positions for a gasoline engine, includes entering a base torque request, a known spark advance, a known CAM position and a known exhaust gas recirculation (EGR) valve position into an inverse torque model to generate a first iteration desired air per cylinder (APC) value. The first iteration desired APC value is passed through a deadband filter to produce a filtered first iteration desired APC signal. A Predicted As Cal (PAC) spark advance is calculated for the filtered first iteration desired APC value. The PAC spark advance and the base torque request are modified, and data from a first lookup table is entered to generate a second iteration desired APC value.

Method to determine reference airflow actuator positions for a gasoline engine

A diagnostic system for an engine of a vehicle includes a temperature determination module, a comparison module, and a fault indication module. The temperature determination module receives an indication of whether one or more cylinders within the engine are deactivated and selects a first temperature threshold based on the indication. The comparison module selectively determines whether a temperature of engine coolant is less than the first temperature threshold. The fault indication module diagnoses a fault in response to the comparison module determining that the temperature of the engine coolant is less than the first temperature threshold.

Minimum power consumption for cool down diagnostic based on cylinder deactivation

A method of phasing the opening and closing of internal combustion engine intake and exhaust valves relative to the rotation of the crankshaft is based upon changes in engine speed, engine load and ambient relative humidity. During certain conditions of higher humidity, in order to maintain good combustion stability and thus overall engine operation, it is necessary to reduce intake and exhaust valve overlap by adjusting the phase of the intake and exhaust camshafts. This is achieved by utilizing a set of cam position reference values and constraints based upon engine speed, engine load and humidity that are contained in lookup tables that adjust and limit cam position and valve overlap. Generally speaking, in order to maintain optimum engine performance, intake and exhaust valve overlap is reduced with higher ambient humidity and vice versa.

Method of controlling camshaft phase based on humidity

A method of conducting prognosis for an airflow management system for a combustion engine includes adjusting a throttle body valve position control signal in response to a detected airflow variation and monitoring an airflow variation compensation (AVC) value corresponding to a degree of adjustment of the control signal. The method also includes generating a throttle body coking severity metric based on at least a plurality of residual error values and the AVC value, and executing at least one response action based on the throttle body coking severity metric exceeding a predetermined threshold.

Combustion engine airflow management systems and methods

A method for controlling engine torque in a vehicle during a default throttle condition includes determining whether a throttle of the engine is in a default throttle condition, determining whether the engine is producing more torque than desired if the throttle of the engine is in the default throttle condition, and applying an accessory load to the engine if the engine is producing more torque than desired in the default throttle condition.

Method and controller for engine torque control in a vehicle during a default throttle condition

A catalyst control system includes a stop and start module that, during a period that the vehicle is ON between (i) a first time when the vehicle is turned ON and (i) a second time when the vehicle is next turned OFF, selectively shuts down and starts a spark ignition engine of the vehicle. A catalyst light off (CLO) control module initiates a first CLO event for a first engine startup during the period and, when a temperature of a catalyst that receives exhaust output by the engine is less than a predetermined temperature, selectively initiates a second CLO event for a second engine startup during the period. A fuel control module richens fueling of the engine during the first and second CLO events of the period. A spark control module retards spark timing of the engine during the first and second CLO events of the period.

Systems and methods for multiple catalyst light off events during drive cycle

A method of controlling intake and exhaust cam phase in an internal combustion engine for optimal HVAC performance in a motor vehicle includes requesting a cabin heating value, sensing an engine speed and an engine load of the internal combustion engine, utilizing the cabin heating value, the engine speed and the engine load in one or more lookup tables to determine intake phaser constraint values and exhaust phaser constraint values for cabin heating, and transitioning the intake phaser constraint values and the exhaust phaser constraint values for cabin heating to intake phaser constraint values and exhaust phaser constraint values based on one or more lookup tables for normal operation without a cabin heating request.

Method of engine cam control for cabin heating

A selective catalytic reduction (SCR) system includes a first sensor that determines a first concentration of NO, a second sensor that determines a second concentration of NOand NH, and a fault determination module. The fault determination module diagnoses a fault in at least one of a dosing agent and a catalyst in an SCR device based on the first and second concentrations.

Diagnostic systems and methods for selective catalytic reduction (SCR) systems based on NOx sensor feedback

A system according to the principles of the present disclosure includes an error count module and a sensor diagnostic module. The error count module increases an error count when an actual air/fuel ratio generated by an oxygen sensor monitoring an exhaust system of an engine is different than a desired air/fuel ratio. The error count module selectively adjusts a rate at which the error count is increased based on an ambient temperature. The sensor diagnostic module diagnoses a fault in the oxygen sensor when the error count is greater than a first predetermined count.

System and method for diagnosing a fault in an oxygen sensor based on ambient temperature

A diagnostic system of a vehicle includes an impedance module and a diagnostic module. The impedance module determines an impedance of a sensing element of an exhaust gas oxygen sensor based on a response of the sensing element to a change in current through the sensing element. The diagnostic module selectively diagnoses a fault associated with the exhaust gas oxygen sensor based on the impedance of the sensing element.

Fault diagnostic systems and methods using oxygen sensor impedance

A control system for a selective catalytic reduction (SCR) system includes a dosing control module, a comparison module, and a status determination module. The dosing control module controls a dosing system to inject a desired amount of ammonia into exhaust gas at a first location in an exhaust stream. The comparison module compares a measured amount of ammonia in the exhaust gas to the desired amount of ammonia, wherein the measured amount of ammonia is measured at a second location downstream from the first location and upstream from or within an SCR catalyst. The status determination module determines a pass/fail status of a component of the dosing system based on the comparison between the measured amount of ammonia and the desired amount of ammonia.

System and method for determining selective catalytic reduction dosing system performance using an ammonia sensor

A system according to the principles of the present disclosure includes a pump control module and a pump diagnostic module. The pump control module commands a water pump to switch between on and off, wherein the water pump circulates coolant through an engine when the water pump switches on as commanded. The pump diagnostic module diagnoses a fault in the water pump based on a change in a crankshaft speed of the engine when the water pump is commanded to switch between on and off.

System and method for diagnosing a fault in a switchable water pump for an engine based on a change in crankshaft speed

A system according to the principles of the present disclosure includes a diagnostic execution module and a diagnostic disabling module. The diagnostic execution module diagnoses a fault in at least one of an oxygen sensor and a catalytic converter based on input received from the oxygen sensor. The diagnostic disabling module disables the diagnosing based on at least one of a temperature of the catalytic converter and a mass flow rate of air flowing through the catalytic converter.

Diagnostic system and method for an oxygen sensor positioned downstream from a catalytic converter

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Swartz Creek, MI, United States of America

Stephen Paul Levijoki