CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A control device for an internal combustion engine which does not require fitting of a feed forward term on an occasion of calculation of a fuel amount to be supplied at a time of temperature raising control is provided. According to the present embodiment, by feed forward control using a steady-state DPF model and a steady-state CCO model, a basic amount (feed forward term) of a fuel amount Qinj that is added from a fuel injector 20 in the temperature raising control can be calculated. Namely, the feed forward term can be calculated without depending on a control map. If the feed forward term can be calculated without depending on the control map, fitting of the feed forward term with use of the controlling map is not required.

主权项

1. A control device for an internal combustion engine, comprising:
a first purifying device that is provided in an exhaust passage of the internal combustion engine and has an oxidation catalyst function; a second purifying device that is provided downstream of the first purifying device, in the exhaust passage; a fuel supply device that supplies fuel to upstream of the first purifying device; and a control device that controls a temperature of the second purifying device to a target temperature by controlling a fuel supply amount from the fuel supply device, wherein the control device comprises a first model that is constructed based on a relation of a heat balance established in the first purifying device, and a second model that is constructed based on a relation of a heat balance established in the second purifying device, the first model and the second model are constructed on a precondition that all of the fuel supplied from the fuel supply device is converted into heat in the first purifying device, and all of the converted heat contributes to raising a temperature of the first purifying device, and the control device is configured to calculate the temperature of the first purifying device by inputting the target temperature into the second model and calculate the fuel supply amount by inputting the calculated temperature into the first model.