DUAL FUEL ENGINE CONTROL UNIT

PROBLEM TO BE SOLVED: To provide a multi-mode engine system comprising a first mode in which the engine is fuelled by a first fuel, and a second mode in which the engine is fuelled by a second fuel, or by a mixture of the first and second fuels.SOLUTION: The multi-mode engine system comprises a first engine control unit (ECU) for controlling the flow of the first fuel in the first mode, a plurality of first sensors for emitting first input signals dependent on detected values of the first variable, and a second ECU, wherein the first ECU comprises: a signal receiving part for receiving the first input signals, and an output part for emitting a first output signal which depends on the first input signal and decides an amount of the first fuel supplied to the engine, and the second ECU is adapted to modify the first output signal in the second mode to produce a first modified signal which decides the amount of the first fuel supplied to the engine in the second mode and a second calculated signal which decides an amount of second fuel supplied to the engine in the second mode.