Abstract: An oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system includes a controller having a first oxygen sensor input configured and disposed to receive a first oxygen sensor value upstream of an oxidation catalyst (OC) device and a second oxygen sensor input configured to receive a second oxygen sensor value downstream of the OC device. The controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values.

Abstract: A turbocharger controller includes a turbocharger compressor temperature module having a compressor inlet air temperature input, and a turbocharger compressor pressure module including a compressor inlet pressure input and a compressor outlet pressure input. A memory module includes a compressor outlet temperature calibration map and a compressor pressure ratio look-up table. A turbocharger boost pressure ratio control module is operatively connected to the turbocharger compressor temperature module, the turbocharger compressor pressure module, and the memory module. The turbocharger boost pressure ratio control module is configured to selectively compare compressor outlet pressure and compressor inlet pressure with values in the compressor ratio look-up table to determine a turbocharger boost pressure set point establishing a desired compressor outlet temperature.

Abstract: An oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system includes a controller having a first oxygen sensor input configured and disposed to receive a first oxygen sensor value upstream of an oxidation catalyst (OC) device and a second oxygen sensor input configured to receive a second oxygen sensor value downstream of the OC device. The controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values.

Abstract: 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.

Abstract: A system according to the principles of the present disclosure includes an exhaust braking enabling module, a driver torque module, and an engine actuator control module. The exhaust braking enabling module selectively enables exhaust braking based on driver input and independent of an accelerator pedal position. The driver torque module selectively determines a driver torque request based on a powertrain braking torque capacity when exhaust braking is enabled. The engine actuator control module controls fuel delivery to cylinders of an engine and a vane position of a turbocharger based on the driver torque request.

Abstract: A vehicle includes an engine having cylinders in fluid communication with an intake air flow, a mass air flow (MAF) sensor positioned with respect to the intake air flow which outputs a pulse train signal describing the frequency of the intake air flow, and a controller. The controller includes a calibrated non-linear conversion curve recorded in memory. The controller executes a method to convert the frequency data into a corresponding mass air flow using the calibrated non-linear conversion curve, determines the instantaneous mass air flow value at each leading or trailing edge of the pulse train signal, and accumulates the instantaneous mass air flow values over a calibrated duration. A time-weighted average of the accumulated mass air flow values is then used to execute a control action. The controller includes a host computer device and memory storing the curve and instructions for executing the method.

Abstract: A method for adjusting an oxygen sensor measurement within an exhaust gas feedstream output from an internal combustion engine based on humidity includes monitoring relative humidity of ambient air obtained from a humidity sensor. Specific humidity at the oxygen sensor is modeled based on the relative humidity. The oxygen sensor measurement is adjusted based on the modeled specific humidity at the oxygen sensor.

Abstract: 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.

Abstract: A method for controlling an exhaust-braking engine maneuver includes driving a compressor by a turbine so that the compressor receives and compresses an intake stream of fluid to produce a stream of compressed fluid. The method also includes receiving a stream of engine working fluid that includes the stream of compressed fluid, and discharging, to an exhaust system, an exhaust stream comprising the stream of engine working fluid. A stream of scavenged exhaust fluid comprising at least a portion of the exhaust stream is received, and work is extracted from the stream of scavenged exhaust fluid by the turbine to drive the compressor. The variable turbine nozzle and an intake throttle valve are modulated so as to satisfy one or more turbine control criterion and one or more compressor control criterion.

Abstract: A method of controlling a diesel engine includes sensing a speed of the diesel engine, and closing a throttle of the diesel engine when the sensed speed of the diesel engine is equal to or greater than a maximum allowable engine speed to prevent oxygen from entering an intake manifold of the diesel engine, thereby preventing combustion and stopping the operation of the diesel engine. An Exhaust Gas Recirculation (EGR) valve is actuated to regulate circulation of exhaust gas from the diesel engine through the intake manifold to control pressure within the intake manifold to prevent damage to other engine components from excessive positive or negative pressure.

Abstract: A method of regenerating a diesel particulate filter (DPF) may include operating a vehicle including a diesel engine at an idle condition and applying a load to the diesel engine during the idle condition to increase an exhaust temperature of the diesel engine relative to a nominal idle condition. The increased exhaust temperature may regenerate a diesel particulate filter of the diesel engine during the idle condition.

Abstract: A method and system for preventing vehicle movement during start-up arising from a false-neutral indication. Using signals from one or more wheel speed sensors of the vehicle, a vehicle processor determines if the vehicle is moving during start-up, and if so, outputs a termination signal to shut-down the vehicle before any additional movement occurs.

Abstract: A post injection control system for regulating diesel particulate regeneration of a diesel particulate filter (DPF) with a diesel engine includes a mass airflow sensor that generates a mass airflow signal. A temperature sensor senses the temperature of exhaust and generates an exhaust temperature signal. And a control module commands post injection at a post injection value determined from the mass airflow signal and at a post injection rate determined from the exhaust temperature signal.

Abstract: A method and system for preventing vehicle movement during start-up arising from a false-neutral indication. Using signals from one or more wheel speed sensors of the vehicle, a vehicle processor determines if the vehicle is moving during start-up, and if so, outputs a termination signal to shut-down the vehicle before any additional movement occurs.

Abstract: A diesel engine system having an exhaust system with a catalyst and a diesel particulate filter includes a first module that determines a light-off temperature of the catalyst based on an exhaust flow rate (EFR) through the exhaust system and a second module that selectively generates an enable signal based on the light-off temperature and a catalyst temperature. A DPF regeneration sequence is enabled based on said enable signal.

Abstract: A control system for particulate filters is provided. The control system for a particulate filter includes a clean filter estimating module that estimates a clean pressure based on a first pressure in the particulate filter within a predetermined period of a regeneration event. A soot prediction module estimates a level of soot in the particulate filter based on a comparison of the first pressure and a second pressure in the particulate filter received after the predetermined period.

Abstract: A method of regenerating a diesel particulate filter (DPF) may include operating a vehicle including a diesel engine at an idle condition and applying a load to the diesel engine during the idle condition to increase an exhaust temperature of the diesel engine relative to a nominal idle condition. The increased exhaust temperature may regenerate a diesel particulate filter of the diesel engine during the idle condition.

Abstract: A control system for particulate filters is provided. The control system for a particulate filter includes a clean filter estimating module that estimates a clean pressure based on a first pressure in the particulate filter within a predetermined period of a regeneration event. A soot prediction module estimates a level of soot in the particulate filter based on a comparison of the first pressure and a second pressure in the particulate filter received after the predetermined period.