Abstract: A vehicle power system includes a motor, a battery, and one or more controllers. The motor is configured to propel the vehicle. The battery is configured to supply power to the motor. The one or more controllers are programmed to, responsive to detecting a wheel slip or a longitudinal tractive force being outside a preferred range, adjust an accelerator pedal mapping such that a same amount of accelerator pedal travel before the adjustment corresponds to an amount of mechanical power output by the motor that is different than an amount of mechanical power output by the motor after the adjustment.

Abstract: A humidification system for a fuel cell may include a condenser configured to receive fluid output from a cathode of the fuel cell and cool the fluid to extract water from it. A heat exchanger operable to transfer heat from a heat source to an airflow flowing through the heat exchanger may also be included. When the heated airflow is brought into contact with at least some of the extracted water, the airflow is humidified prior to its entering the cathode.

Abstract: An apparatus for delivering a primary fuel stream to a fuel cell stack is provided. The apparatus includes an ejector that is configured to receive the primary fuel stream from a fuel supply. The apparatus is further configured to receive the recirculated fuel stream from the fuel cell stack to provide a combined fluid stream for delivery to the fuel cell stack. The ejector includes an elastic conduit for varying a flow of the combined fluid stream based on a power level of the fuel cell stack.

Abstract: A humidification system for a fuel cell may include a condenser configured to receive fluid output from a cathode of the fuel cell and cool the fluid to extract water from it. A heat exchanger operable to transfer heat from a heat source to an airflow flowing through the heat exchanger may also be included. When the heated airflow is brought into contact with at least some of the extracted water, the airflow is humidified prior to its entering the cathode.

Abstract: An apparatus for delivering a primary fuel stream to a fuel cell stack is provided. The apparatus includes an ejector that is configured to receive the primary fuel stream from a fuel supply. The apparatus is further configured to receive the recirculated fuel stream from the fuel cell stack to provide a combined fluid stream for delivery to the fuel cell stack. The ejector includes an elastic conduit for varying a flow of the combined fluid stream based on a power level of the fuel cell stack.

Abstract: The present application describes methods and apparatuses for reducing stick-slip in drilling operations. An example apparatus may include a cylindrical tool body and a first roller disposed on an outer surface of the cylindrical tool body at a first location. The first roller may be at least partially disposed within a first cavity at the first location. The apparatus may also include a second roller disposed on the outer surface of the cylindrical tool body at a second location. The second location may be offset laterally and circumferentially from the first location on the cylindrical tool body. The second roller may be at least partially disposed within a second cavity at the second location.

Abstract: A cooling system for an internal combustion engine, comprising a first, high temperature, cooling circuit coupled to an engine for cooling the engine, where a first coolant circulates in the first circuit; and a second, low temperature, cooling circuit coupled to a plurality of devices for cooling the plurality of devices, where a second coolant circulates in the second circuit, the second cooling circuit includes a plurality of radiator segments, the coolant circulating in the second cooling circuit may exit at different radiator segments of the plurality of radiator segments producing coolant streams of different cooling temperatures for cooling different devices of the plurality of devices.

Abstract: A technique includes providing power to a group fuel cell system components and providing sensors to monitor conditions of the fuel cell system. The status of each sensor is associated with a switch, and the switches are serially coupled together. The delivery of power to the fuel cell system components is regulated in response to states of the switches.

Abstract: A technique includes providing power to a group fuel cell system components and providing sensors to monitor conditions of the fuel cell system. The status of each sensor is associated with a switch, and the switches are serially coupled together. The delivery of power to the fuel cell system components is regulated in response to states of the switches.