Various methods and systems are provided for an auxiliary power unit of a vehicle. In one example, a system for a vehicle having a main power unit (MPU) coupled to an alternator and an auxiliary power unit (APU) configured to provide power to one or more hotel loads of the vehicle comprises: a controller with computer readable instructions stored in non-transitory memory executable to initiate operation of the APU in response to a drain load being applied to a battery of the vehicle that will deplete the battery to a state of charge (SOC) level that is less than a determined SOC threshold level in less time than a determined period, and the MPU is not in operation.

A system and method are for managing the energy supplied to a transport vehicle. A first and a second source of energy provide electrical energy to power at least one piece of consumer equipment of the vehicle. An intermediate energy transmission system receives electrical energy provided by at least one of the two sources of energy and transfers it to the at least one piece of consumer equipment. An energy conversion-control system applies, at the input of the intermediate energy transmission system, the electrical energy to be provided, adjusted depending on the operational state of the first source of energy and on an input signal indicative of an operational state of the second source. The first source of energy includes an internal combustion engine connected to a permanent-magnet alternator that is placed between the internal combustion engine and the energy conversion-control system.

A system and method are for managing the energy supplied to a transport vehicle. A first and a second source of energy provide electrical energy to power at least one piece of consumer equipment of the vehicle. An intermediate energy transmission system receives electrical energy provided by at least one of the two sources of energy and transfers it to the at least one piece of consumer equipment. An energy conversion-control system applies, at the input of the intermediate energy transmission system, the electrical energy to be provided, adjusted depending on the operational state of the first source of energy and on an input signal indicative of an operational state of the second source. The first source of energy includes an internal combustion engine connected to a permanent-magnet alternator that is placed between the internal combustion engine and the energy conversion-control system.

Various methods and systems are provided for a radial turbocharger. In one example, the turbocharger comprises a turbine case housing a turbine wheel and a compressor case housing a compressor wheel, the turbine case including a vaneless turbine nozzle integrated into the turbine case, a bearing case surrounding a shaft connecting the turbine wheel to the compressor wheel and arranged between the turbine case and compressor case, a plurality of long bolts arranged around a circumference of the turbine case, and a plurality of slots arranged around a circumference of the turbine case, a slot length of each slot extending in a radial direction and adapted to receive a dowel pin having a diameter smaller than the slot length, where each dowel pin, via a corresponding slot, couples the bearing case to the turbine case.

Various methods and systems are provided for a radial turbocharger. In one example, the turbocharger comprises a turbine case housing a turbine wheel and a compressor case housing a compressor wheel, the turbine case including a vaneless turbine nozzle integrated into the turbine case, a bearing case surrounding a shaft connecting the turbine wheel to the compressor wheel and arranged between the turbine case and compressor case, a plurality of long bolts arranged around a circumference of the turbine case, and a plurality of slots arranged around a circumference of the turbine case, a slot length of each slot extending in a radial direction and adapted to receive a dowel pin having a diameter smaller than the slot length, where each dowel pin, via a corresponding slot, couples the bearing case to the turbine case.

A method that includes coupling an external, removable fuel pressurization system to a fuel system of a vehicle while the vehicle remains in a confined space. The fuel system of the vehicle is pressurized with the fuel pressurization system while the vehicle remains in the confined space and without activating an engine of the vehicle. Decay of pressure of the fuel system is monitored following pressurization of the fuel system, and one or more of a leak, or a replaceable component, of the fuel system of the vehicle is detected based on at least in part on the decay of pressure that are monitored.

Various methods and systems are provided for an auxiliary power unit of a vehicle that provides electrical power and compressed air while a main engine of the vehicle is not running. In one example, an auxiliary power unit (APU) comprises: an engine, an alternator, and a compressor, all mounted to a common base frame in a triangular arrangement with the alternator and compressor arranged adjacent to one another and each of the alternator and compressor rotationally coupled with the engine through a gearbox spaced between the engine and each of the compressor and alternator.

Various methods and systems are provided for an auxiliary power unit of a vehicle that provides electrical power and compressed air while a main engine of the vehicle is not running. In one example, an auxiliary power unit (APU) comprises: an engine, an alternator, and a compressor, all mounted to a common base frame in a triangular arrangement with the alternator and compressor arranged adjacent to one another and each of the alternator and compressor rotationally coupled with the engine through a gearbox spaced between the engine and each of the compressor and alternator.

Various systems are provided for an electric turbocharger. As one example, an electric turbocharger includes a turbine casing housing a turbine wheel and a compressor casing housing a compressor wheel, a bearing casing surrounding a shaft connecting the turbine wheel and the compressor wheel, the bearing casing split into a turbine bearing casing, compressor bearing casing, and a stator casing, the stator casing positioned between the turbine bearing casing and compressor bearing casing and housing an electric motor mounted on and around the shaft, and a plurality of bolts, each bolt of the plurality of bolts extending parallel to the shaft and from an outer face of the compressor bearing casing, through the stator casing and turbine bearing casing, and into the turbine casing.

Various systems are provided for an electric turbocharger. As one example, an electric turbocharger includes a turbine casing housing a turbine wheel and a compressor casing housing a compressor wheel, a bearing casing surrounding a shaft connecting the turbine wheel and the compressor wheel, the bearing casing split into a turbine bearing casing, compressor bearing casing, and a stator casing, the stator casing positioned between the turbine bearing casing and compressor bearing casing and housing an electric motor mounted on and around the shaft, and a plurality of bolts, each bolt of the plurality of bolts extending parallel to the shaft and from an outer face of the compressor bearing casing, through the stator casing and turbine bearing casing, and into the turbine casing.