Six-stroke internal combustion engine valve activation system and method for operating such engine

摘要

An engine combustion cylinder is fluidly connectable to an intake system through an intake valve and to an exhaust system through an exhaust valve. A valve activation system is to activate the intake valve and the exhaust valve. The valve activation system is responsive to a controller providing command signals to the valve activation system such that, when the engine operates in a six-stroke combustion cycle, the intake valve is opened during a recompression stroke to allow a portion of the products from the first combustion stroke to exit the combustion cylinder and enter into the intake system.

主权项

1. An internal combustion engine having a combustion cylinder, which operates on a combustion cycle that includes an intake stroke, during which air is admitted into the combustion cylinder, a compression stroke, during which the air in the combustion cylinder is compressed and fuel is added, a first combustion stroke, a recompression stroke, during which products from the first combustion stroke are compressed in the combustion cylinder and additional fuel is added, a second combustion stroke, and an exhaust stroke, the engine comprising:
an intake system including an intake collector in fluid communication with the combustion cylinder; an exhaust system including an exhaust collector in fluid communication with the combustion cylinder; a recirculation system including a recirculation passage connected to the combustion cylinder via a recirculation runner; at least one intake valve disposed to selectively fluidly connect the combustion cylinder with the intake system; at least one exhaust valve disposed to selectively fluidly connect the combustion cylinder with the exhaust system; a recirculation valve disposed to selectively fluidly connect the combustion system with the recirculation runner; a valve activation system configured to activate the at least one intake valve, the recirculation valve, and the at least one exhaust valve; and a controller associated with the internal combustion engine is configured to provide command signals to the valve activation system, such that:
the at least one intake valve is opened during the recompression stroke to allow a portion of the products from the first combustion stroke to exit the combustion cylinder and enter into the intake collector, andthe recirculation valve is opened during the recompression stroke to allow an additional portion of the products to enter into the recirculation passage.