Abstract: Vehicles, transmissions, and methods of dampening oscillations at an output shaft of a transmission are disclosed. A vehicle includes a chassis, a plurality of wheels coupled to the chassis, and a powertrain mounted to the chassis that includes a transmission. The transmission includes an input shaft to receive torque from a drive unit, an output shaft to transmit torque to a load, at least one torque-transmitting mechanism coupled between the input shaft and the output shaft, and a control system having an output speed sensor to provide an input signal indicative of a rotational speed of the output shaft and a controller communicatively coupled to the output speed sensor.

Abstract: Systems and/or methods for determining the natural frequencies of rotating machinery systems, including complex rotating machinery systems such as the powertrains of vehicles powered by internal combustion engines, are disclosed. Embodiments include receiving information from a sensor related to the rotation of a component in the drivetrain (such as a rotating toothed gear), calculating a velocity of the component, calculating a transformed velocity of the component (such as by using a Fast Fourier Transform), selecting one or more shaft orders desired for analysis (such as those based on a predetermined set of likely shaft orders), selecting the amplitudes of the select shaft orders, normalizing the amplitudes, mapping the normalized amplitudes to the Hertz domain, calculating local maxima of the normalized amplitudes, and/or identifying frequencies associated with the calculated local maxima. Additional embodiments include repeating the procedures and identifying clusters of local maxima.

Abstract: Vehicles, transmissions, and methods of dampening oscillations at an output shaft of a transmission are disclosed. A vehicle includes a chassis, a plurality of wheels coupled to the chassis, and a powertrain mounted to the chassis that includes a transmission. The transmission includes an input shaft to receive torque from a drive unit, an output shaft to transmit torque to a load, at least one torque-transmitting mechanism coupled between the input shaft and the output shaft, and a control system having an output speed sensor to provide an input signal indicative of a rotational speed of the output shaft and a controller communicatively coupled to the output speed sensor.

Abstract: Vehicles, transmissions, and methods of dampening oscillations at an output shaft of a transmission are disclosed. A vehicle includes a chassis, a plurality of wheels coupled to the chassis, and a powertrain mounted to the chassis that includes a transmission. The transmission includes an input shaft to receive torque from a drive unit, an output shaft to transmit torque to a load, at least one torque-transmitting mechanism coupled between the input shaft and the output shaft, and a control system having an output speed sensor to provide an input signal indicative of a rotational speed of the output shaft and a controller communicatively coupled to the output speed sensor.

Abstract: An apparatus for determining a deterioration of a NOx sensor response rate in an internal combustion engine system includes an engine control module configured to stop fueling to an internal combustion engine during motoring of the internal combustion engine. The apparatus also includes a signal monitoring module configured to monitor a NOx sensor signal after the engine control module stops fueling to the internal combustion engine during motoring of the engine and store NOx sensor signal data corresponding to the monitored NOx sensor signal. Additionally, the apparatus includes a time constant module that is configured to determine a time constant of the NOx sensor response after the engine control module stops fueling. The apparatus further includes a response rate deterioration module configured to determine a response rate deterioration value of the NOx sensor based at least partially on the determined time constant.

Abstract: In one embodiment, an apparatus for determining a deterioration of a NOx sensor response rate in an internal combustion engine system includes an engine control module configured to stop fueling to an internal combustion engine during motoring of the internal combustion engine. The apparatus also includes a signal monitoring module configured to monitor a NOx sensor signal after the engine control module stops fueling to the internal combustion engine during motoring of the engine and store NOx sensor signal data corresponding to the monitored NOx sensor signal. Additionally, the apparatus includes a time constant module that is configured to determine a time constant of the NOx sensor response after the engine control module stops fueling. The apparatus further includes a response rate deterioration module configured to determine a response rate deterioration value of the NOx sensor based at least partially on the determined time constant.