Patent ID: 8813492
Filing Date: 2014-08-26
Classification: F01C,F02B,F02D,F04C,Y02T

Abstract:
1. A supercharged internal combustion engine comprising: a diesel internal combustion engine having at least one combustion chamber, a supercharger for supplying air to the combustion chamber of the internal combustion engine, the supercharger includes a housing having a pair of chambers and an axial passage located adjacent one of the chambers, said axial passage having an air bypass opening open to one of the chambers and atmosphere, a pair of rotors rotatable about parallel axes located in the chambers operable to move air through the housing to atmosphere and to the combustion chamber of the engine, and an air flow control apparatus operable to vary the mass and pressure of the air supplied to the combustion chamber of the internal combustion engine responsive to the power requirements of the internal combustion engine to vary the rate of flow of air delivered to the combustion chamber of the internal combustion engine at or above the naturally aspirated rate of air flow into the combustion chamber of the internal combustion engine, said air flow control apparatus including a slide assembly axially movable in the passage in the housing for axial movement between maximum air bypass, partially air bypass and minimum air bypass positions relative to the axes of rotation of the rotors and said air bypass opening whereby a first portion of air moved by the rotors when the slide assembly is in the maximum air bypass and partially air bypass positions is directed uncompressed to atmosphere and a second portion of the air moved by the rotors is directed to the combustion chamber of the engine, an actuator operably connected to the slide assembly to selectively move the slide assembly between maximum air bypass, partially air bypass and minimum air bypass positions to vary the second portion of air directed to the combustion chamber of the internal combustion engine, thereby selectively increasing or decreasing the mass of air and associated internal compression ratio of the air moved by the rotors to the combustion chamber of the internal combustion engine, a power transmission drivably connecting the internal combustion engine to the rotors of the supercharger whereby the internal combustion engine operates the supercharger to generate a supply of air, a fuel injector for introducing fuel into the air in the combustion chamber of the internal combustion engine corresponding to the rate of flow of air delivered to the combustion chamber of the internal combustion engine by the supercharger, a sensor for providing signals representative of the load requirements of the internal combustion engine, and a control processor configured to; responsive to the signals from the sensor, provide command signals for operating the actuator and control the fuel injector to regulate the amount of fuel introduced into the combustion chamber and the timing of the fuel injection into the combustion chamber of the internal combustion engine.