Patent ID: 8880268

Claim:
A control device for a hybrid vehicle comprising: a mode switching unit for switching a travel mode of the vehicle, between a series mode in which drive wheels are driven by power of an electric motor driven by electric power generated by a power generator driven by power of an internal combustion engine, and a parallel mode in which the drive wheels are driven by power of the internal combustion engine and power of the electric motor driven by electric power supplied from a secondary battery; an operation state detection unit for detecting an operation state of the internal combustion engine; an assumed output value calculation unit for calculating an assumed output value of the internal combustion engine assumed based on the operation state of the internal combustion engine; an actual output value calculation unit for calculating an actual output value of the internal combustion engine based on an amount of electric power generation of the power generator; and a friction torque calculation unit for subtracting the actual output value from the assumed output value to calculate friction torque when the travel mode is the series mode; wherein the friction torque calculation unit has an upper limit clip value and a lower limit clip value, when the friction torque is larger than the upper limit clip value, the friction torque is set to the upper limit clip value, and when the friction torque is smaller than the lower limit clip value, the friction torque is set to the lower limit clip value.