A method for reducing fuel consumption of a work vehicle may include monitoring one or more loads associated with both a drive power requirement and a hydraulic power requirement for the work vehicle. In addition, the method may include actively adjusting one or more operating parameters of the work vehicle based on the monitored loads in a manner that meets the drive power requirement and the hydraulic power requirement for the work vehicle while reducing the fuel consumption of the vehicle's engine.

A method for reducing fuel consumption of a work vehicle may include monitoring one or more loads associated with both a drive power requirement and a hydraulic power requirement for the work vehicle. In addition, the method may include actively adjusting one or more operating parameters of the work vehicle based on the monitored loads in a manner that meets the drive power requirement and the hydraulic power requirement for the work vehicle while reducing the fuel consumption of the vehicle's engine.

Turbocharger systems and related methods and devices are provided for determining rotational speed of a turbocharger. A speed sensing device is mounted to a turbocharger and includes an acceleration sensing arrangement and an acoustic sensing arrangement. The speed sensing device outputs an acceleration-based speed value as the current turbo speed when the acceleration-based speed is stable, and otherwise outputs an acoustic-based speed value to as the current turbo speed if the acoustic-based speed value stable or outputs an estimated value as the current turbo speed when both of the acceleration-based and acoustic-based speeds are unstable. In exemplary embodiments, the acceleration sensing arrangement and the acoustic sensing arrangement are provided on a common substrate.

Turbocharger systems and related methods and devices are provided for determining rotational speed of a turbocharger. A speed sensing device is mounted to a turbocharger and includes an acceleration sensing arrangement and an acoustic sensing arrangement. The speed sensing device outputs an acceleration-based speed value as the current turbo speed when the acceleration-based speed is stable, and otherwise outputs an acoustic-based speed value to as the current turbo speed if the acoustic-based speed value stable or outputs an estimated value as the current turbo speed when both of the acceleration-based and acoustic-based speeds are unstable. In exemplary embodiments, the acceleration sensing arrangement and the acoustic sensing arrangement are provided on a common substrate.

A starter controller incorporated in a starter control system for controlling actuation of a first starter and a second starter to start an engine. The second starter is an alternating-current (AC) starter. The starter control system actuates the first starter in response to an engine start-up request, deactivates the first starter before completion of engine start-up, and activates the second starter while the second starter is being rotated by rotation of an engine rotary shaft. In the starter controller, a determination unit is configured to, under a condition where the engine rotary shaft is rotating after deactivation of the first starter, determine whether or not recognition of rotation of the second starter is complete. A fail-safe unit is configured to, if the recognition of rotation of the second starter is complete, perform predefined fail-safe processing responding to an abnormality in the second starter.

An illustrative embodiment of a fuel injector control system includes a driver that is configured to supply electrical power to a fuel injector. A controller is configured to control the driver by implementing a predetermined sequence of a plurality of states for an injection cycle. The plurality of states each include parameters for supplying electrical power to the fuel injector. The controller selects one of the states to implement as a next one of the states in the sequence based on a characteristic of an activation signal and information indicative of the state corresponding to the characteristic of the activation signal.

A method is disclosed for detecting a malfunction of an oxygen sensor in the exhaust gas system of an internal combustion engine having several cylinders. The cylinders are operated at the same air-fuel ratio and the resultant first output signal of the oxygen sensor is monitored. The cylinders are operated at varying air-fuel ratios and the resultant second output signal of the oxygen sensor is monitored. The first and second output signals are compared to determine whether the oxygen sensor has malfunctioned.

A method is disclosed for detecting a malfunction of an oxygen sensor in the exhaust gas system of an internal combustion engine having several cylinders. The cylinders are operated at the same air-fuel ratio and the resultant first output signal of the oxygen sensor is monitored. The cylinders are operated at varying air-fuel ratios and the resultant second output signal of the oxygen sensor is monitored. The first and second output signals are compared to determine whether the oxygen sensor has malfunctioned.

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, during a cold start, a method may include adjusting a position of a first valve disposed in an exhaust gas recirculation (EGR) passage based on an engine operating condition, the EGR passage coupled between the first exhaust manifold coupled to a first set of exhaust valves and the intake passage, upstream of a compressor. As one example, the engine operating condition may include an engine temperature or a temperature of a catalyst disposed in the exhaust passage.

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, during a cold start, a method may include adjusting a position of a first valve disposed in an exhaust gas recirculation (EGR) passage based on an engine operating condition, the EGR passage coupled between the first exhaust manifold coupled to a first set of exhaust valves and the intake passage, upstream of a compressor. As one example, the engine operating condition may include an engine temperature or a temperature of a catalyst disposed in the exhaust passage.