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A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method includes varying a relative amount of engine exhaust in air pressurized in the boost tank based on engine operating conditions, and

A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method includes varying a relative amount of engine exhaust in air pressurized in the boost tank based on engine operating conditions, and discharging the air pressurized in the boost tank to the intake manifold.

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1. A method for providing air to a cylinder of an engine including a compressor and a boost tank, comprising: varying a relative amount of engine exhaust in air pressurized in the boost tank based on operating conditions, including admitting a compressor effluent to the boost tank when a waste gate

1. A method for providing air to a cylinder of an engine including a compressor and a boost tank, comprising: varying a relative amount of engine exhaust in air pressurized in the boost tank based on operating conditions, including admitting a compressor effluent to the boost tank when a waste gate of a turbine is closed;discharging the air pressurized in the boost tank to an intake manifold; anddirect injecting fuel into the cylinder. 2. A method for providing air to a cylinder of an engine including a turbocharger compressor and a boost tank selectably coupled to an intake manifold, comprising: varying a relative amount of engine exhaust in air pressurized in the boost tank based on engine operating conditions, including admitting an effluent of the turbocharger compressor to the boost tank when a waste gate of a turbine is closed, the turbocharger compressor mechanically coupled to the turbine; anddischarging the air pressurized in the boost tank to the intake manifold. 3. The method of claim 2, wherein varying the relative amount of engine exhaust comprises admitting an effluent of an air pump distinct from the compressor to the boost tank; and wherein the air pump is one or more of an electrically driven air pump, an engine-shaft driven air pump, a wheel-driven air pump, an air- or exhaust-driven pressure amplifier, and an unfueled cylinder of the engine. 4. The method of claim 2, wherein varying the relative amount of engine exhaust comprises admitting an effluent of an air pump distinct from the compressor to the boost tank; and wherein the air pump is configurable for vacuum or pressure operation, the method further comprising actuating one or more valves coupled to the air pump to configure the air pump for pressure operation. 5. The method of claim 4, wherein admitting the effluent of the air pump comprises admitting the effluent selectively, based on a pressure in a vacuum reservoir coupled to the air pump. 6. The method of claim 2, wherein varying the relative amount of engine exhaust comprises admitting an effluent of an air pump distinct from the compressor to the boost tank; and wherein admitting the effluent of the air pump comprises admitting the effluent selectively, based on an engine torque demand. 7. A method for providing air to a cylinder of an engine including a turbocharger compressor and a boost tank selectably coupled to an intake manifold comprising: varying a relative amount of engine exhaust in air pressurized in the boost tank based on engine operating conditions including admitting an effluent of an air pump distinct from the turbocharger compressor to the boost tank selectively, based on an availability of stationary electrical grid power; anddischarging the air pressurized in the boost tank to the intake manifold.