Abstract: The present disclosure describes a roof-mounted airbag apparatus in a vehicle. The vehicle includes a roof, an instrument panel, and two passenger seats in a front row. The airbag apparatus includes an inflator and an airbag that is fluidly coupled to the inflator. The airbag is inflatable and deployable from the roof in an interior of the vehicle between the passenger seats and the instrument panel, and includes a cavity.

Abstract: An engine system having a reductant delivery and storage system is described. In one example, a physical condition associated with a reductant storage device is correlated with a characteristic of a fluid stored in the reductant storage device to determine the availability and make-up of the stored fluid. In response, engine operation may be adjusted.

Abstract: A method of operating an internal combustion engine having a reductant delivery and storage system in an emission control system, comprising coordinating a physical condition associated with a reductant storage device, wherein the physical condition may correspond to a measure of liquid stored in the reductant storage device, with a characteristic of a fluid stored in the reductant storage device to determine the availability and make-up of the stored fluid, wherein at least one of the physical condition and the property of the stored fluid is determined by a plurality of sensors; and adjusting engine operation based on said coordinating the condition associated with the reductant storage device with the property of the stored fluid.