Importance

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Abstract

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, a system for a vehicle having a main power unit (MPU) coupled to an alternator, and an auxiliary power unit (APU), and the APU is 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 that when executed during operation of the vehicle cause the controller to initiate operation of the APU in response to at least one of: a state of charge (SOC) of a battery of the vehicle being below a determined SOC threshold level, and the MPU is not in operation, and a drain load is applied to the battery that will deplete the battery to a SOC level that is less than the determined SOC threshold level in less time than a determined period, and the MPU is not in operation, and an air pressure level of an air reservoir of the vehicle is below a determined air pressure threshold level, and the MPU is not in operation.

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First Claim