Abstract: An apparatus for reducing noise from a work machine is disclosed. The work machine includes a location determining device for determining the location of the work machine within a work site and a memory device for storing desired noise levels for each location within the work site. The work machine further includes a control unit for determining the location of the work machine from the location determining device and reading the desired noise level for the location from the memory device. The control unit further places the work machine in a normal mode of operation if the desired noise level exceeds a threshold noise level and places the work machine in a reduced noise mode of operation if the desired noise level falls below the threshold noise level. A method for reducing noise from a work machine is also disclosed.

Abstract: An apparatus for reducing noise from a work machine is disclosed. The work machine includes a location determining device for determining the location of the work machine within a work site and a memory device for storing desired noise levels for each location within the work site. The work machine further includes a control unit for determining the location of the work machine from the location determining device and reading the desired noise level for the location from the memory device. The control unit further places the work machine in a normal mode of operation if the desired noise level exceeds a threshold noise level and places the work machine in a reduced noise mode of operation if the desired noise level falls below the threshold noise level. A method for reducing noise from a work machine is also disclosed.

Abstract: An apparatus and method for automatically reducing engine exhaust noise from a dump truck including a heated bed without the additional requirement of diverting the flow of exhaust through a separate muffler apparatus. An engine noise reduction system associated with the truck includes an engine control unit for controlling high idle engine speed parameters of the truck engine. When the truck bed is raised upwardly from an initial lowered position to release a material load from the bed, or hydraulics associated with the truck bed are actuated to raise the bed, the engine control unit automatically lowers the high idle engine speed of the truck engine to reduce engine noise from the truck engine. The high idle engine speed of the truck engine is automatically reset to the standard setting when the truck bed returns to the initial lowered position.