INTAKE AIR UNDERCOOLING PREVENTIVE DEVICE AT ENGINE SPEED REDUCTION TIME FOR INTERNAL COMBUSTION ENGINE HAVING INTERCOOLER

摘要

PURPOSE: To effectively prevent undercooling of intake air at engine speed reduction time, and prevent a misfire from being caused when an ignition delay becomes large by constituting so that cooling performance of an intercooler can be reduced by actuating an intercooler cooling performance changing means when a speed reduction condition of an engine is detected. CONSTITUTION: An intercooler cooling performance changing means 4 composed of an opening-closing valve 4A to open and close an air taking-in port 11 is arranged in the air taking-in port 11 of a hood 10 of a vehicle, and this is controller through an intercooler cooling performance reducing means 6 composed of an accelerator pedal 6A according to output of an engine speed reduction condition detecting means 5 composed of an accelerator pedal 5A. That is, when the accelerator pedal 5A is turned off, the air taking-in port 11 is closed by the opening-closing valve 4A. Or it is squeezed, and outside air blown against an intercooler 3 is reduced thereby, and intake air cooling performance of the intercooler 3 is reduced. On the other hand, when the accelerator pedal 5A is turned on, the opening-closing valve 4A is opened.