Internal combustion engine with supercharger
AssigneeMazda Motor Corporation
InventorsMitsuo Hitomi, Kenji Kashiyama, Shunji Masuda
Life of this patent
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Abstract
An internal combustion engine with a supercharger, of a reciprocating piston type, having a supercharger disposed in an intake passage, wherein the relation of a pressure ratio (.gamma.=P/Po) of pressure (P) on the discharge side of the supercharger to atmospheric pressure (Po) at the time of high load with a geometric compression ratio (.epsilon.) of the engine and a cylinder bore size (B), represented by millimeter, satisfies the following formula: .gamma..gtoreq.-0.29.epsilon.+6.0-0.022B.
Claims46
An internal combustion engine with a supercharger, of a reciprocating piston type, having a supercharger disposed in an intake passage, wherein the relation of a pressure ratio (.gamma.=P/Po) of pressure (P) on the discharge side of the supercharger to atmospheric pressure (Po) at the time of high load with a geometric compression ratio (.epsilon.) of the engine and a cylinder bore size (B), represented by millimeter, satisfies the following formula:
- .gamma..gtoreq.-0.29E+6.0-0.022B.
A supercharged internal combustion engine of a reciprocating piston type, having a supercharger disposed in an intake passage, comprising:
- an EGR means for recirculating exhaust gases into a combustion chamber in a cylinder of the engine at least at the time of high load;
- wherein said cylinder bore size is set to 70 mm or less;
- and
- wherein the relation of a geometric compression ratio .epsilon. of the engine with an EGR ratio, Re (%), in which exhaust gases are recirculated by said EGR means satisfies the following formula:
- Re.gtoreq.(9-.epsilon.).times.3.
A supercharged internal combustion engine of a reciprocating piston type, having a supercharger disposed in an intake passage, comprising:
- an EGR means for recirculating exhaust gases into a combustion chamber in a cylinder of the engine at least at the time of high load;
- wherein a speed of engine rotation, Na, which gives a piston speed Um=2.0.times.10,000 mm per second, is set to be equal to or larger than a speed of engine rotation, Nb, which reaches a mean intake mach number Mi =0.5;
- and
- wherein the relation of a geometric compression ratio .epsilon. of the engine with an EGR rate Re, represented by %, of recirculation of the exhaust gases by the EGR means satisfies the following formula:
- Re.gtoreq.(9-.epsilon.).times.3.
A supercharged internal combustion engine of a reciprocating piston type, having a supercharger disposed in an intake passage, comprising:
- an EGR means for recirculating exhaust gases into a combustion chamber in a cylinder of the engine at least at the time of high load;
- wherein a displacement of one cylinder, that is, a single chamber volume, is set to be 400 cc or less;
- wherein a ratio of a piston stroke S to said cylinder bore size B is set to S/B>1;
- and
- wherein the relation of a geometric compression ratio .epsilon. of the engine with an EGR rate Re, represented by of recirculation of the exhaust gases by the EGR means satisfies the following formula:
- Re.gtoreq.(9-.epsilon.).times.3.
An internal combustion engine of a reciprocating piston type with a supercharger, having a supercharger disposed in an intake passage,
- wherein relations of a pressure ratio .gamma. of a pressure (P) on the discharge side of said supercharger at the time of high load to atmospheric pressure (Po), a geometric compression ratio E of the engine, said cylinder bore size B (mm), and an octane value Ro of fuel satisfies the following formula:
- .gamma..gtoreq.0. 29E+0.09+0.059Ro-0.022B.
Dependencies are inferred from the claim text.