Use of external exhaust gas recirculation (“EGR”) to improve compression release braking and method for EGR valve and system cleaning
OwnerRobb Janak, Neil Fuchsinventors
Life of this patent
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Abstract
In an internal combustion engine comprising a gas recirculation passage connecting an exhaust manifold to an intake manifold, a compression release valve, and at least one gas pulse created during a first event, a method for retarding the engine comprising the steps of opening the compression release valve, releasing at least one gas pulse into the gas recirculation passage after a first event, redirecting the at least one gas pulse into the intake manifold, and using the at least one gas pulse to increase air charge in a cylinder.
Claims14
A method for retarding an internal combustion engine, comprising the steps of:
- providing a gas recirculation passage connecting an exhaust manifold to an intake manifold;
- providing at least one compression release means associated with the gas recirculation passage and the exhaust manifold;
- creating at least one compression event;
- opening the compression release means;
- releasing the at least one compression event from the exhaust manifold into the gas recirculation passage after a first compression event;
- redirecting the first compression event into the intake manifold;
- and using the first compression event to increase air charge in a cylinder.
A gas recirculation system for improving engine braking in an internal combustion engine having an intake valve, an exhaust valve, and a cylinder, said gas recirculation system comprising:
- an exhaust manifold operatively connected to the cylinder through the exhaust valve;
- an intake manifold operatively connected to the cylinder through the intake valve;
- a gas recirculation passage connecting said exhaust manifold to said intake manifold;
- means for controlling the flow of gas from the cylinder, said flow control means operatively connected to said exhaust manifold;
- and
- a valve disposed in said gas recirculation passage having a first position for selectively recirculating gas from said exhaust manifold to said intake manifold through said gas recirculation passage during an engine braking event and a second position for directing the gas from the exhaust manifold through said flow control means.
A method of improving engine braking using gas recirculation in an internal combustion engine having an intake valve, an exhaust valve, an intake manifold, an exhaust manifold, and a cylinder, said method comprising the steps of:
- providing a first valve disposed in a gas recirculation passage connecting the exhaust manifold to the intake manifold;
- generating a gas pulse during an engine braking event;
- selectively operating the first valve during the engine braking event;
- recirculating the gas pulse to the intake manifold;
- and
- increasing the air charge in the cylinder.
Dependencies are inferred from the claim text.