| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an engine brake system of an internal combustion engine which increases the maximum absorption torque in the range from an engine middle speed rotation region to an engine high speed rotation region, and to provide a method of controlling the engine brake system of an internal combustion engine. <P>SOLUTION: The engine brake system 20 of an internal combustion engine 10 includes: an intake throttle 24 and a mechanical supercharger 21 in an intake passage 12 of the internal combustion engine 10; an exhaust brake valve 25 in an exhaust passage 16; a bypass passage 22 which bypasses the mechanical supercharger 21; and a flow rate control valve 23 in the bypass passage 22. In the engine brake system 20, such a supercharging operation as to increase driving loss of the mechanical supercharger 21 is performed by controlling the valve opening degree of the flow rate control valve 23 in such a manner that the operation pressure ratio of the mechanical supercharger 21 does not exceed the limit upon the engine brake operation, and the valve opening degree of the intake throttle 24 is adjusted and controlled so as to provide a supercharging pressure providing a suction and exhaust pressure difference at which pump loss becomes maximum. <P>COPYRIGHT: (C)2012,JPO&INPIT |
