Method and system for on vehicle compressed air generation

A vehicle system, comprising:

• an engine comprising a first cylinder bank comprising a plurality of first cylinders and a second cylinder bank comprising a plurality of second cylinders;
• a first exhaust passage configured to receive exhaust from only the plurality of first cylinders;
• a second exhaust passage configured to receive exhaust from only the plurality of second cylinders;
• a first catalyst arranged in the first exhaust passage and a second catalyst arranged in the second exhaust passage;
• a first junction arranged downstream of the first catalyst in the first exhaust passage relative to a direction of exhaust flow;
• a first exhaust branch extending from the first junction to the second exhaust passage, wherein a first exhaust valve is arranged in the first exhaust branch;
• a second exhaust branch extending from the first junction to a boost device, wherein a second exhaust valve is arranged in the second exhaust branch;
• and
• the boost device fluidly coupled to the second exhaust branch via a first inlet, the boost device further comprising a first outlet configured to expel exhaust air received from the first inlet to a portion of the second exhaust passage adjacent to a tailpipe downstream of a third junction at which the first exhaust branch and the second exhaust passage intersect, and wherein the boost device further comprises a second inlet configured to admit ambient air and a second outlet configured to expel compressed ambient air to a tank.

A method, comprising:

• flowing exhaust air from a plurality of first cylinders to a first inlet of a boost device and expelling the exhaust air via a first outlet;
• flowing a gas to the boost device via a second inlet and expelling compressed ambient air to a tank via a second outlet, wherein the tank is configured to drive an air tool, the boost device arranged in a first exhaust passage;
• and
• flowing exhaust gas from a plurality of second cylinders to a second exhaust passage, wherein the plurality of second cylinders are fueled and the plurality of first cylinders are free of fuel during a compressed air mode.