Exhaust gas recirculation system
AssigneeDetroit Diesel Corporation
InventorFabien G. Redon
Life of this patent
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Abstract
An exhaust gas recirculation (EGR) system and method for simple and rapid introduction of EGR gas to an internal combustion engine include a pump, tank, and valve connected to the engine. Exhaust gas is pressurized by operation of the pump under predetermined operating conditions and stored in the tank. The valve is selectively controlled to meter amounts of the EGR gas to the engine. The EGR tank can be separate or integrally formed within tubing used to direct EGR gas flow.
Claims22
An exhaust gas recirculation (EGR) system for introduction of EGR gas to a turbocharged internal combustion engine, the system comprising:
- an EGR pump located downstream from a turbine of the turbocharged engine for pressurizing EGR exhaust gas received from the turbine;
- an EGR tank for storing pressurized exhaust gas;
- and
- an EGR valve to introduce stored EGR gas to an intake manifold that then delivers the introduced EGR gas to intake ports of the engine.
An exhaust gas recirculation (EGR) method for metering EGR gas to a turbocharged engine, the method comprising:
- receiving EGR gas from a turbine of the turbocharged engine;
- pressurizing the received EGR gas;
- storing the pressurized EGR gas in an EGR tank;
- and
- controlling an EGR valve to introduce the stored EGR gas to an intake manifold of the engine that then delivers the EGR gas to intake ports of the engine.
A method for controlling exhaust gas recirculation (EGR) in a multi-cylinder internal combustion engine having an EGR circuit for redirecting a portion of exhaust gas downstream from a turbocharger to an EGR pump and pressurized EGR gas storage area, the engine including a single EGR valve for selectively delivering stored EGR gas to an intake manifold upstream of cylinder intake ports, the method comprising:
- determining a desired stored EGR pressure based on current engine operating conditions;
- and
- controlling the EGR pump based on the desired stored EGR pressure.
A computer readable storage medium having stored data representing instructions executable by a computer for controlling exhaust gas recirculation (EGR) in a multi-cylinder internal combustion engine having an EGR circuit for redirecting a portion of exhaust gas downstream from a turbocharger to an EGR pump and pressurized EGR gas storage area, the engine including a single EGR valve for selectively delivering stored EGR gas to an intake manifold upstream of cylinder intake ports, the computer readable storage medium comprising:
- instructions for determining a desired stored EGR pressure based on current engine operating conditions;
- and
- instructions for controlling the EGR pump based on the desired stored EGR pressure.
Dependencies are inferred from the claim text.