Device for controlling driving mode and method for controlling driving mode using the same

1. A method for controlling an operation mode of engine implementing a cylinder deactivation (CDA) by a controller, the method comprising:

determining an operation state signal of engine;

determining whether a CDA operation is available by using the operation state signal,

calculating a fuel consumption prediction value and an exhaust temperature prediction value in the CDA operation when the CDA operation is available; and

determining an engine operation whether to enter a CDA mode by using at least one of the fuel consumption prediction value and the exhaust temperature prediction value,

wherein the calculating the fuel consumption prediction value includes:

determining a first fuel consumption prediction value in a normal mode and a second fuel consumption prediction value in the CDA mode, and

predicting a fuel consumption duration time when the second fuel consumption prediction value in the CDA mode is greater than the first fuel consumption prediction value in the normal mode,

wherein the determining the engine operation whether to enter the CDA mode includes determining to enter the CDA mode when the fuel consumption duration time is equal to or greater than a threshold value.

2. The method of claim 1 , wherein the operation state signal of the vehicle includes at least one of an engine speed, a fuel amount, an atmospheric pressure, an atmospheric temperature, a coolant temperature, an oil pressure, and an oil temperature.

3. The method of claim 2 , wherein the determining the exhaust temperature prediction value includes:

determining a first exhaust temperature prediction value in the normal mode and a second exhaust temperature prediction value in the CDA mode.

4. The method of claim 3 , wherein the determining the exhaust temperature prediction value further includes:

predicting an exhaust temperature increasing duration time when the second exhaust temperature prediction value in the CDA mode is greater than the first exhaust temperature prediction value in the normal mode.

5. The method of claim 4 , wherein the determining whether to enter the CDA mode includes:

determining to enter the CDA mode when the exhaust temperature increasing duration time is equal to or greater than a threshold value.

6. A device for controlling an operation mode of engine, comprising:

a calculation unit configured to calculate a fuel consumption prediction value in a cylinder deactivation (CDA) operation of the engine, and

a controller configured to determine whether the CDA operation is available, and to determine an engine operation whether or not entering a CDA mode,

wherein the calculation unit includes:

a fuel consumption calculation unit configured to determine a first fuel consumption prediction value in a normal mode and a second fuel consumption prediction value in the CDA mode; and

a fuel consumption duration time calculation unit configured to determine a fuel consumption duration time when the second fuel consumption prediction value is greater than the first fuel consumption prediction value, and

wherein the controller determines to enter the CDA mode when the fuel consumption duration time is equal to or greater than a threshold value.

7. The device of claim 6 , wherein the calculation unit further includes:

an exhaust temperature calculation unit configured to determine an exhaust temperature prediction value by the CDA operation, and determine a first exhaust temperature prediction value in the normal mode and a second exhaust temperature prediction value in the CDA mode.

8. The device of claim 7 , wherein the calculation unit further includes:

an exhaust temperature duration time calculation unit configured to determine an exhaust temperature increasing duration time when the second exhaust temperature prediction value is greater than the first exhaust temperature prediction value.

9. The device of claim 8 , wherein the controller determines to enter the CDA mode when the exhaust temperature increasing duration time is equal to or greater than a threshold value.