Abstract: External air is drawn through a HVAC unit from an exterior air intake and recirculated air through a recirculation air inlet. An air intake management system includes first and second variable speed blowers and an air flow regulator. The air flow regulator defines a number of flow paths through which either exterior or recirculated air is drawn by either the first blower or the second blower. A valve arrangement regulates the flow of air through at least one of the flow paths. Control of the valves and the operating speeds of the blowers enables the amount and relative proportions of the external and recirculated air passing through the HVAC unit to be controlled. One air flow path for external air is permanently open and has an air mass flow sensor to monitor the flow of air.

Abstract: A vehicle seat assembly including a vehicle seat mounted on a spring suspension system, the seat assembly having a safe mode into which it can be placed when the seat is unoccupied to avoid damage to the spring suspension system due to forces generated within the suspension system of an unoccupied seat. The seat assembly is configured to be placed in communication with a control system of an associated vehicle in which it is mounted and to invoke the safe mode in dependence on the vehicle being placed in a predetermined operating mode of the vehicle which is indicative that the seat will be unoccupied.

Abstract: A sensor assembly for mounting a microphone to an aperture of a vehicle trim panel. The microphone is in a housing with an opening permitting ambient sound to reach the microphone. A sound channel has a grid portion in the form of a first radially extending flange at a first end and an engagement portion in the form of a second radially extending flange at the other end which engages a T-slot recess on the underside of the housing. When the engagement portion engages with the T-slot recess and slides to a closed end of the recess, the sound passage is aligned with the microphone.

Abstract: A sensor assembly for mounting a microphone to an aperture of a vehicle trim panel. The microphone is in a housing with an opening permitting ambient sound to reach the microphone. A sound channel has a grid portion in the form of a first radially extending flange at a first end and an engagement portion in the form of a second radially extending flange at the other end which engages a T-slot recess on the underside of the housing. When the engagement portion engages with the T-slot recess and slides to a closed end of the recess, the sound passage is aligned with the microphone.

Abstract: A switching device for use on an agricultural vehicle such as an agricultural tractor. The switching device has first and second switches, wherein the second switch is mounted on or carried by the first switch. The switches can be operated in different directions, to allow control of different variables by an operator. In a preferred aspect, the first and second switches are used to control related variables. As the second switch is provided on the first switch, accordingly an operator can easily interpret the control of the related variables, without having to look at the switching device.