Abstract: An engine diagnostic system includes a control system having a controller operatively connected to an engine. A monitoring system has a sensor operatively connected to the engine. A diagnostic system is operatively connected to the engine. The diagnostic system is configured to implement a sensor diagnostic procedure that includes a sensor health test. The sensor health test includes comparing a measured value of a sensor to an expected value and determining the health of the sensor based on the difference between the measured value and the expected value. The sensor diagnostic procedure can also include telematics data analysis.

Abstract: A fresh air and exhaust gas control method for an engine includes monitoring parameters of an engine in an operational state using a plurality of sensors and generating engine state estimates using an engine observer model. The engine observer model represents an intake manifold volume, an exhaust manifold volume, and a charge air cooler volume. The method also includes generating a turbocharger rotational speed estimate using a turbocharger model and calculating a fresh air flow correction factor. The method further includes determining a desired air throttle position and a desired EGR valve position based on setpoint commands, the monitored engine parameters, the fresh air flow correction factor, the engine state estimates, and the turbocharger rotational speed estimate. The method additionally includes adjusting the air throttle based on the desired air throttle position and adjusting the EGR valve based on the desired EGR valve position.

Abstract: A variable geometry turbocharger control method includes monitoring parameters of an engine using a plurality of sensors and generating engine state estimates using an engine observer model. The engine observer model represents the intake manifold volume, the exhaust manifold volume, and the charge air cooler volume. The engine state estimates are based on the monitored engine parameters from the plurality of sensors. The method also includes calculating a turbine intake correction factor based on the differences between the measured engine states and the engine state estimates and inputting the turbine intake correction factor to the engine observer model. The method further includes determining a desired turbocharger vane position based on setpoint commands, the monitored engine parameters, the turbine intake correction factor, and the engine state estimates.

Abstract: A machine includes an engine and a governor operable to control an operating speed of the engine along a first droop curve such that the operating speed is a function of an operating load of the engine. The first droop curve includes a first region that defines a first slope, a second region that defines a second slope different from the first slope, and a transition point located at an intersection of the first region and the second region. The machine further includes a controller in communication with the governor. The controller is configured to determine an average operating load of the engine over a predetermined time period, adjust the location of the transition point based at least in part on the average operating load to create a second droop curve, and operate the engine based on the second droop curve.

Abstract: An engine diagnostic system includes a control system having a controller operatively connected to an engine. A monitoring system has a sensor operatively connected to the engine. A diagnostic system is operatively connected to the engine. The diagnostic system is configured to implement a sensor diagnostic procedure that includes a sensor health test. The sensor health test includes comparing a measured value of a sensor to an expected value and determining the health of the sensor based on the difference between the measured value and the expected value. The sensor diagnostic procedure can also include telematics data analysis.

Abstract: A variable geometry turbocharger control method and system for an engine air system with a variable geometry turbocharger having adjustable vanes. The method includes monitoring engine parameters; generating engine state estimates using an engine observer model; generating measured engine states based on the monitored engine parameters; computing observer error based on the differences between the measured and modeled engine states; generating model correction factors; and generating commands for adjusting the vane positions of the variable geometry turbocharger. An inverse engine observer model can generate the desired variable geometry turbocharger vane positions. The method can include generating feedback actuator commands in generating the desired variable geometry turbocharger vane positions. The correction factors can include fresh air, EGR and/or turbine mass flow correction factors.

Abstract: The inverse engine model or feed forward controller 310 takes the controlled state estimates 324 generated by the engine observer model 304, the model corrections 320 generated by the observer controller 306, desired state inputs 322 and various system parameters 326 and calculates desired engine state commands 330 and feed forward mass flow terms 332 to achieve the desired D/A and F/A values included in the desired state inputs 322. A fresh air and exhaust gas control method for an engine includes monitoring parameters of an engine in an operational state using a plurality of sensors and generating engine state estimates using an engine observer model. The engine observer model represents an intake manifold volume, an exhaust manifold volume, and a charge air cooler volume. The method also includes generating a turbocharger rotational speed estimate using a turbocharger model and calculating a fresh air flow correction factor.

Abstract: A machine includes an engine and a governor operable to control an operating speed of the engine along a first droop curve such that the operating speed is a function of an operating load of the engine. The first droop curve includes a first region that defines a first slope, a second region that defines a second slope different from the first slope, and a transition point located at an intersection of the first region and the second region. The machine further includes a controller in communication with the governor. The controller is configured to determine an average operating load of the engine over a predetermined time period, adjust the location of the transition point based at least in part on the average operating load to create a second droop curve, and operate the engine based on the second droop curve.

Abstract: An exhaust gas recirculation (EGR) flow correction system and method are disclosed for an engine air system with air and EGR inputs to a mixer. The system includes three temperature sensors to measure temperatures of the air input, EGR input, and mixer output; and an air system model computing EGR flow corrections using the three temperatures. Air system can include intake manifold, charge air cooler (CAC), air throttle, EGR cooler and EGR valve, with first sensor between CAC and air throttle, second sensor between EGR cooler and EGR valve, third sensor in intake manifold. Air system model can estimate mass flows through air and EGR inputs, estimate intake manifold temperature at third sensor, estimate intake manifold temperature error, and compute EGR corrections based on temperature error. Air system model can estimate CAC and EGR cooler outlet temperatures, and mixer input temperature.

Abstract: Controlling an exhaust gas temperature of an engine. An electronic control unit receives a parameter setpoint command, monitors parameters of an engine using a plurality of sensors, receives measured engine states based on the monitored engine parameters from the plurality of sensors, generates measured engine state estimates and controlled engine state estimates using an engine observer model, determines an observer error based on a difference between the measured engine states and the measured engine state estimates, generates model corrections based on the observer error, generates a desired exhaust throttle valve position using an inverse engine model based on the parameter setpoint command, the controlled engine state estimates, and the model corrections, and adjusts a position of the exhaust throttle valve based on the desired exhaust throttle position.

Abstract: A work vehicle including an engine, configured to supply power for driving a ground engaging traction device, and a hybrid power system to drive a powertrain. An engine controller is operatively coupled to the engine and is configured to generate a hybrid torque command received by a hybrid powertrain controller operatively coupled to the engine controller. The hybrid powertrain controller is configured to generate an available hybrid torque signal and a desired hybrid torque signal both of which are configured to be received by the engine controller. The engine controller generates an engine command signal configured to command the engine to operate at a commanded engine torque, in response to the available hybrid torque signal and the desired hybrid torque signal.

Abstract: Controlling an exhaust gas temperature of an engine. An electronic control unit receives a parameter setpoint command, monitors parameters of an engine using a plurality of sensors, receives measured engine states based on the monitored engine parameters from the plurality of sensors, generates measured engine state estimates and controlled engine state estimates using an engine observer model, determines an observer error based on a difference between the measured engine states and the measured engine state estimates, generates model corrections based on the observer error, generates a desired exhaust throttle valve position using an inverse engine model based on the parameter setpoint command, the controlled engine state estimates, and the model corrections, and adjusts a position of the exhaust throttle valve based on the desired exhaust throttle position.

Abstract: A system including a vessel, an image capturing device, and a processor. The vessel at least partially contacts a liquid, wherein the liquid has a liquid surface that is defined by a quantity of the liquid, a shape of the vessel, and an orientation of the vessel relative to a horizontal plane. The image capturing device is spaced apart from the liquid surface and captures an image thereof. The processor is in communication with the image capturing device for analyzing a characteristic of the image and determining an attribute of the liquid therefrom.

Abstract: System and method of treating exhaust gas from an internal combustion engine using selective catalytic injection and a modulated supply of diesel exhaust fluid. The modulated supply of diesel exhaust fluid induces variations in nitrogen oxides exiting a selective catalytic reduction chamber. An electronic control unit inputs a signal from a sensor that senses the variations in nitrogen oxides. The signal is filtered at the modulation frequency to isolate peak-to-peak variations in the signal caused by the modulated diesel exhaust fluid supply. Based on whether the peak-to-peak variations are above a threshold thus indicating a predominance of nitrogen oxides over reductant, the electronic control unit adjusts the supply of diesel exhaust fluid.

Abstract: An exhaust gas recirculation (EGR) flow correction system and method are disclosed for an engine air system with air and EGR inputs to a mixer. The system includes three temperature sensors to measure temperatures of the air input, EGR input, and mixer output; and an air system model computing EGR flow corrections using the three temperatures. Air system can include intake manifold, charge air cooler (CAC), air throttle, EGR cooler and EGR valve, with first sensor between CAC and air throttle, second sensor between EGR cooler and EGR valve, third sensor in intake manifold. Air system model can estimate mass flows through air and EGR inputs, estimate intake manifold temperature at third sensor, estimate intake manifold temperature error, and compute EGR corrections based on temperature error. Air system model can estimate CAC and EGR cooler outlet temperatures, and mixer input temperature.

Abstract: A system including a container, an imaging structure, an image capturing device, and a processor. The container at least partially surrounds a liquid. The liquid has a liquid surface that is defined by a quantity of the liquid in the container, a shape of the container, and an orientation of the container relative to a horizontal plane. The imaging structure is positioned in the container. The image capturing device captures an image of the liquid surface and the imaging structure. The processor is in communication with the image capturing device for analyzing a characteristic of the image, and for determining an attribute therefrom.

Abstract: A work vehicle including an engine, configured to supply power for driving a ground engaging traction device, and a hybrid power system to drive a powertrain. An engine controller is operatively coupled to the engine and is configured to generate a hybrid torque command received by a hybrid powertrain controller operatively coupled to the engine controller. The hybrid powertrain controller is configured to generate an available hybrid torque signal and a desired hybrid torque signal both of which are configured to be received by the engine controller. The engine controller generates an engine command signal configured to command the engine to operate at a commanded engine torque, in response to the available hybrid torque signal and the desired hybrid torque signal.

Abstract: A fresh air and exhaust gas control method and system for an engine air system with an air throttle and exhaust gas recirculation (EGR) valve. The method includes monitoring engine parameters; generating engine state estimates using an engine observer model; generating measured engine states based on the monitored engine parameters; computing observer error based on the differences between the measured and modeled engine states; generating model correction factors; and generating commands for adjusting the air throttle and EGR valve. An inverse engine observer model can generate the desired air throttle and EGR valve positions. The method can include generating feedback actuator commands in generating the desired air throttle and EGR valve positions. The correction factors can include fresh air, EGR and/or turbine mass flow correction factors.

Abstract: A variable geometry turbocharger control method and system for an engine air system with a variable geometry turbocharger having adjustable vanes. The method includes monitoring engine parameters; generating engine state estimates using an engine observer model; generating measured engine states based on the monitored engine parameters; computing observer error based on the differences between the measured and modeled engine states; generating model correction factors; and generating commands for adjusting the vane positions of the variable geometry turbocharger. An inverse engine observer model can generate the desired variable geometry turbocharger vane positions. The method can include generating feedback actuator commands in generating the desired variable geometry turbocharger vane positions. The correction factors can include fresh air, EGR and/or turbine mass flow correction factors.

Abstract: A system is described for modeling various states of an operating engine and the adjustment of one or more operating characteristics of the engine based upon such modeling. A representative rate of change of a system mass for an engine is determined based upon, at least in part, a first state equation. A first representative mass flow approximating a mass flow across a throttle is determined based upon, at least in part, a second state equation. A second representative mass flow approximating a mass flow across an exhaust gas recirculation valve is determined based upon, at least in part, a third state equation. Determining the first representative mass flow includes specifying a throttle time constant modifier for the second state equation. Determining the second representative mass flow includes specifying an exhaust gas recirculation valve time constant modifier for the third state equation.