초록 ▼

The invention uses the supersonic blast occurring when the exhaust is opened in an internal combustion engine having a variable volume combustion chamber. A transfer conduit is provided between the exhaust pipe and the intake pipe, the volume of this conduit being greater than the cubic capacity of

The invention uses the supersonic blast occurring when the exhaust is opened in an internal combustion engine having a variable volume combustion chamber. A transfer conduit is provided between the exhaust pipe and the intake pipe, the volume of this conduit being greater than the cubic capacity of the cylinder, as well as a supply channel and a discharge channel, of a smaller section than the conduit, between this latter and the combustive air intake manifold and the burnt gas exhaust manifold. The invention applies principally to supercharged diesel engines with low compression rate.

대표청구항 ▼

In a supercharged internal combustion engine, comprising: a number n of work chambers, particularly n cylinders, n being an integer at least equal to two, with n intake pipes, for the intake of at least air under pressure into each work chamber, means for providing fuel to each of said work chambers

In a supercharged internal combustion engine, comprising: a number n of work chambers, particularly n cylinders, n being an integer at least equal to two, with n intake pipes, for the intake of at least air under pressure into each work chamber, means for providing fuel to each of said work chambers, and n exhaust pipes for discharge of burnt gases outside each work chamber and an associated blast wave produced by a combustion explosion occurring therein, a common intake manifold for the n work chambers of the engine for admitting air under pressure in said engine, and a common exhaust manifold for the n work chambers of the engine for discharging the burnt gases outside the engine, a turbine receiving the burnt gases from said common exhaust manifold and, a compressor driven by said turbine fed by atmospheric air and delivering air under pressure to said common intake manifold, the improvement consisting in providing said engine with a number n of transfer conduits, each conduit connecting directly an associated one of said exhaust pipes to an associated one of said intake pipes, each one of said n exhaust pipes being connected to one of said n intake pipes of a different work chamber, and the volume of each one of said n transfer conduits being at least equal to that of the associated work chambers connected thereto, and including n pairs of passages, each pair of passages putting in permanent communication each of said n transfer conduits with each of said intake and exhaust manifolds such that an exhaust passage of each pair is disposed in vicinity of an associated one of said exhaust pipes and an intake passage of each pair is disposed in vicinity of an associated one of said intake pipes, flow permeability from the intake manifold to the exhaust manifold being successively in series through each of said intake passages, the corresponding transfer conduit and the corresponding exhaust passage allowing in operation the substantially complete discharge towards the exhaust manifold of the burnt gases produced during a preceding cycle in the work chamber associated with said last mentioned exhaust passage and forced into said last mentioned transfer conduit from the exhaust pipe of such associated chamber and the replacement of these gases by at least air under pressure coming from the intake manifold during a period of the engine operating cycle during which said exhaust pipe of such associated chamber and said intake pipe of such associated chamber are each substantially isolated from such associated chamber wherein said passages are designed to reduce to a minimum the radiation, towards the intake and exhaust manifolds, of the blast wave which appears during the opening of the exhaust valve of said chamber and follows said transfer conduit, and wherein said respective passages comprise opening means communicating an inside of such associated conduits with an inside of the corresponding manifold through which said associated conduit passes, the opening means of said exhaust passages having a section less than that of the opening means of said intake passages.