Dana Heavy Vehicle Systems Group, LLC (Maumee, OH)

A vehicle driveline that comprises the first axle assembly, which has a first drive ratio. A second axle assembly in an exclusive driving engagement with the first assembly the first and second axle assemblies possessing an additional drive ratio when engaged in driving. A control system in electrical communication with the first and second axle assemblies wherein the control system is able to selectively engage the second axle assembly in conjunction with the first assembly.

This disclosure is about the auxiliary brake system specifically controls for auxiliary brake apparatuses in a system that has two or more drive wheels.

Commercial vehicles could employ both foundation brake apparatuses as well as auxiliary braking apparatuses. Service brakes are standard foundation braking systems. They can be placed close to wheel-end assemblies. They use friction to stop vehicle motion. Foundation brakes comprise however, they are not restricted to, shoe or pad type brakes like disc brakes or drum brakes.

The effect of engine downspeeding is negative on the effectiveness of a variety of auxiliary braking apparatuses. The efficiency of many auxiliary brake apparatuses is negatively related to engine speed. A system that is able to increase the speed of an engine when auxiliary braking is in operation is essential due to these facts.

In one embodiment the present disclosure offers an automobile driveline comprising a first axle assembly having an initial drive ratio and a second assembly in selective driving engagement with the first assembly. In this case, the first and second axle assemblies are equipped with a second drive ratio when in driving engagement. The vehicle driveline may also contain a control system communicating electrically between the second and first axle assemblies, in which the control system selects to engage the second axle assembly in conjunction with the first axle assembly.

In another form the disclosure described herein provides for a method of operating a driveline of a vehicle that includes providing a first axle assembly having an initial drive ratio and also providing a second assembly for selective engagement with the first axle assembly. In the event of driving engagement the second and first axle assemblies have an entirely different drive ratio. Control systems can be used to communicate with the second and first axle assemblies. A supplementary brake system could also be employed together with the control system. The procedure for operating a vehicle driveline could additionally include detecting the activation of the auxiliary braking system, and thereby involving the second axle assembly in conjunction with the first axle assembly via the control system.

The disclosure also describes the method of operating the driveline of a vehicle. It includes providing first axles with an initial drive ratio and a second one in the driving engagement mode that is selective. In this case, the first and second axle assemblies have an additional drive ratio when engaged in driving. The method of operating a vehicle driveline could also include providing the control system to be in electrical communication with the firstand second axle assemblies. A vehicle driving method may also involve the recognition of an operating parameter as well as the connection of the second assembly in conjunction with the first axle assembly through a the control system.

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