Gm Global Technolgoy Operations, Inc.

Ping Ge

Zhiping Steven Liu

Anupam Gangopadhyay

Yue-Yun Wang

Martino A Casetti

B Jerry Song

Gongshin Qi

Ibrahim Haskara

Min Sun

Gregory Paul Matthews

Shifang Li

Darrell W Burleigh

Zhijian James Wu

Carnell E Williams

Yun Xiao

Steven D Stiles

Anthony Barnard Will

Ryu Hariyoshi

Donald R Meyer

A method and system for estimating air mass per cylinder of an internal combustion engine is provided. An output signal from a MAF sensor is digitally processed to provide an estimate air mass per cylinder (APC). The system includes the MAF sensor; a data acquisition unit configured to receive an output signal from the MAF sensor and produce a sampled signal having a sampling rate greater than one sample per firing event; a multiple band pass (MBP) filter configured to remove signal components caused by airflow pulsations and oscillations through the MAF sensor; an envelope detector configured to detect the lower and upper envelopes of the MBP filtered signal; a MAF estimator configured to estimate a mass airflow based on the detected lower and upper envelopes; a signal decimator; a low pass filter; and a APC converter to converted the low pass filtered signal into an estimated APC.

Method and system for estimating mass airflow using a mass airflow sensor

A fuel vapor control system for a vehicle includes a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle. A purge valve opens to allow fuel vapor flow to an intake system of an engine and closes to prevent fuel vapor flow to the intake system of the engine. An electrical pump pumps fuel vapor from the fuel vapor canister to the purge valve. A vent valve allows fresh air flow to the vapor canister when the vent valve is open and prevents fresh air flow to the vapor canister when the vent valve is closed. A purge control module controls a speed of the electrical pump, opening of the purge valve, and opening of the vent valve.

Purge pump control systems and methods

An exhaust aftertreatment system including a selective catalytic reduction device (SCR), a NOx sensor and a reductant injection system is described. A method for controlling the reductant injection system to inject reductant into the exhaust gas feedstream upstream relative to the SCR includes monitoring engine operation, and determining an initial reductant dosing rate responsive to the engine operation. A dosing perturbation is induced in the reductant dosing rate. The exhaust gas feedstream is monitored via the NOx sensor, and a reductant dosing correction term is determined based upon the monitoring. A final dosing rate for controlling the reductant injection system is determined based upon the initial reductant dosing rate, the dosing perturbation, and the reductant dosing correction term.

Method and apparatus for controlling reductant injection into an exhaust gas feedstream of an internal combustion engine

A method for controlling a turbine of an engine system to achieve a desired boost pressure is provided. The method determines a desired exhaust gas pressure based on the desired boost pressure by using a model for a power balance between the turbine and a compressor of the engine system. The method generates a base command for controlling a position of a vane of the turbine based on a ratio of the desired exhaust gas pressure to a measured turbine outlet pressure.

Turbine expansion ratio estimation for model-based boost control

A method is provided for generating rapid light-off for a diesel oxidation catalyst (DOC) close-coupled to a compression-ignition engine. The engine includes an intake passage in fluid communication with a combustion chamber, a throttle for controlling a flow of intake air through the intake passage, and an exhaust passage configured to channel an exhaust gas from the combustion chamber to the DOC. The method includes starting the engine to commence a warm-up thereof and regulating the throttle to restrict supply of the intake airflow to the combustion chamber. The method additionally includes injecting a predetermined amount of fuel into the combustion chamber during the engine's exhaust cycle such that the injected fuel is carried by the exhaust gas and burned in the exhaust passage. Regulating the throttle and injecting fuel during the warm-up of the engine together increase temperature of the exhaust gas for rapid light-off of the close-coupled DOC.

Increased exhaust temperature warm-up for a rapid light-off of a close-coupled diesel oxidation catalyst

An engine includes an intake manifold mixing an intake air flow and an exhaust gas recirculation flow to provide an intake charge flow. A method to estimate an intake charge temperature of the intake charge includes monitoring system conditions for the engine, determining an effect of the mixing upon a specific heat coefficient of the intake charge flow based upon the monitored system conditions, estimating the intake charge temperature based upon the effect of the mixing upon the specific heat coefficient of the intake charge flow and the monitored system conditions, and controlling the engine based upon the estimated intake charge temperature.

System and method to estimate intake charge temperature for internal combustion engines

A turbocharger control system for a high-pressure turbocharger and a low-pressure turbocharger includes a turbo mode determination module and a transition control module. The turbo mode determination module determines a transition from a dual turbo mode to a single turbo mode. The high-pressure turbocharger is active in the dual turbo mode and idle in the single turbo mode. The transition control module determines a turbine efficiency of the high-pressure turbocharger and controls the high-pressure turbocharger during the transition based on a predetermined maximum turbine efficiency equation.

Turbocharger control systems and methods for improved transient performance

A system for a sequential turbocharger includes a mode selection module, a feed-forward selection module, and a control loop module. The mode selection module generates a control mode signal based on an engine speed signal, an engine torque signal, and an engine mode signal. The control mode signal indicates one of an open-loop control mode and a closed-loop control mode. The feed-forward selection module determines a feed-forward value based on the control mode signal, the engine speed signal, and the engine torque signal. The control loop module determines a loop control value at least one of based on the feed-forward value, a variable geometry turbine (VGT) control signal, and an error signal; and based on a bypass valve (BPV) control signal and the error signal when the control mode signal transitions from the open-loop control mode to the closed-loop control mode.

Mode transition systems and methods for a sequential turbocharger

A method of controlling a turbocharger for an engine and a control system for the same includes a variable nozzle turbine control module operating a variable nozzle turbine of a high pressure turbocharger closed loop in a first load-engine speed region. The system also includes a high pressure turbine bypass valve control module operating a high pressure turbine bypass valve in a closed position in a first load-engine speed region. The variable nozzle turbine control module operates a variable nozzle turbine closed loop in a second load-engine speed region between the first load-speed region and a third load speed region. The high pressure turbine bypass valve module operates the high pressure turbine bypass valve in a transient region in the second load-engine speed region. The variable nozzle turbine control module operates the variable nozzle turbine open loop. The high pressure turbine bypass valve control module operates a high pressure turbine bypass valve in an open position in a third load-engine speed region.

System and method for controlling a two-stage series sequential turbocharger using bypass valve leakage control

An engine control system comprises a current control module and a solenoid actuator module. The current control module determines a duty cycle based on a desired current through a solenoid of an engine system and a resistance of the solenoid and corrects the resistance based on an actual current through the solenoid. The solenoid actuator module actuates the solenoid based on the duty cycle.

Solenoid current control with direct forward prediction and iterative backward state estimation

A method of controlling a series turbocharger for an engine and a control system for the same includes a boost determination module determining a first predicted boost pressure for a first position of a variable geometry turbine when a high pressure turbine bypass valve is in an open position. The boost determination module determines a second boost pressure for a second position of the variable geometry when the high pressure turbine bypass valve is in the open position. A desired boost module determines a desired boost. A comparison module determines when the desired boost signal is between the first predicted boost pressure and the second predicted boost pressure. A bypass valve control module closes the high pressure turbine bypass valve when the desired boost signal is between the first predicted boost pressure and the second predicted boost pressure.

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Northville Township, MI, United States of America

Ping Ge