EXHAUST GAS TEMPERATURE RISE METHOD AND EXHAUST GAS TEMPERATURE RISE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas temperature rise method capable of suppressing deterioration of fuel economy even in a case of making exhaust value opening timing early.SOLUTION: In an internal combustion engine 1, provided a variable valve timing mechanism advancing or retarding opening/closing timing of suction and exhaust valves 12, 15 to a crank angle. When the internal combustion engine 1 is in a low rotation and low load state, the variable valve timing mechanism advances the opening/closing timing of the exhaust valve 15, and retards the opening/closing timing of the suction valve 12, and thereby exhausts part of combustion gas generated in an expansion stroke to an exhaust pipe 2, and suppresses pump loss in a suction stroke with combustion gas left in a cylinder 7 of the internal combustion engine 1.SELECTED DRAWING: Figure 1