CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

When an alcohol mixed fuel is supplied to an internal combustion engine, the magnitude of the alcohol concentration (more specifically, ethanol concentration Cetha) is determined (step 1005), and the magnitude of an operation state temperature (more specifically, cooling water temperature THW) is determined on the basis of said determination (step 1015). When the alcohol concentration is high and the operation state temperature is low, the generation of intermediate products (more specifically, aldehydes), which are alcohol oxides contained in unburned alcohol mixed fuel, is promoted, and the intermediate products generated are trapped in an intake passage by opening an intake valve in the expansion stroke of the internal combustion engine (step 1055).

主权项

1. A control device for an internal combustion engine including: a combustion chamber, an intake passage through which air drawn into the combustion chamber flows; an intake valve disposed in the intake passage; a cylinder injection device that directly injects a fuel containing at least gasoline into the combustion chamber; and a variable valve mechanism that continuously changes opening/closing timing and an opening amount of the intake valve, the control device comprising:
an intermediate product generation amount estimating device that estimates a generation amount of an intermediate product that is generated from an unburned portion of the fuel supplied to the combustion chamber, wherein after the cylinder injection device injects the fuel into the combustion chamber, the variable valve mechanism opens the intake valve in a large valve opening amount for a predetermined time period when a generation amount of the intermediate product that is estimated by the intermediate product generation amount estimating device is large, and the variable valve mechanism opens the intake valve in a small valve opening amount for the predetermined time period when the generation amount of the intermediate product that is estimated by the intermediate product generation amount estimating device is small.