Patent ID: 8049350

Claim:
An apparatus for controlling operation of a cogeneration system equipped at least with a generation unit having a generator connectable to an AC power feed line between a commercial power network and an electrical load and an internal combustion engine driving the generator, and a heat exchanger that exchanges heat with coolant of the engine with exhaust heat from the engine to warm up the coolant to be used for producing hot air or water for a thermal load, comprising: a condensate water hose installed in an exhaust system of the engine for discharging condensate water generated by condensation of moisture in exhaust gas; a hose temperature sensor installed in the condensate water hose for detecting temperature in the hose; an exhaust gas temperature sensor that detects temperature of the exhaust gas exhausted from the engine; and an exhaust gas blowout discriminator that discriminates that the exhaust gas blows out through the condensate water hose when a difference between the detected hose temperature and the detected exhaust gas temperature is found to be less than a predetermined value.