Patent ID: 7792626

Claim:
An engine arrangement comprising: a first internal combustion engine; a second internal combustion engine, wherein each of the first and second engines comprises a crankshaft and at least one cylinder with a piston connected to said crankshaft; a controllable clutch arranged between the crankshafts; an engine control unit connected to and controlling the first and second engines; and sensors for monitoring at least one operating parameter for the engines, wherein: the second engine is configured to be started when a demand for output torque exceeding an available output torque from the first engine is detected; the engine control unit is configured to compare a first engine speed of the first engine and a second engine speed of the second engine, and to control the second engine to minimize the speed difference between the first and the second engine speed, and to control the relative angular position of the first and second crankshafts in relation to a sensed crankshaft position and the ignition timing sequence of the respective first and second engines; and wherein the controllable friction clutch is configured to be actuated to lock up the crankshafts of the first and second engines in at least one predetermined relative angular position.