Abstract: An exhaust system (10) for a dual fuel engine comprising a catalyst assembly comprising a first catalyst (4) comprising a methane oxidizing catalyst and a second catalyst (6) comprising a selective catalytic reduction catalyst, the first catalyst (4) being positioned upstream of the second catalyst (6).

Abstract: An exhaust system (10) for a dual fuel engine, which engine is adapted to operate in a first mode in which the engine is fuelled entirely by a liquid fuel, and a second mode in which the engine is fuelled predominately by a gaseous fuel, the system comprising a first oxidation catalyst (22), a first temperature sensor (30) adapted to measure a core temperature of the first oxidation catalyst, and a controller (32) for controlling whether the engine operates in the first mode or the second mode, wherein the first temperature sensor is operatively connectable to the controller such that the controller prevents the engine from running in the second mode if the core temperature of the first oxidation catalyst is below a predetermined temperature.

Abstract: A multi-mode engine system comprising a first mode in which the engine is fuelled substantially entirely by a first fuel, and a second mode in which the engine is fuelled substantially entirely by a second fuel, or by a mixture of the first and second fuels, the engine comprising: a first engine control unit (ECU) for controlling the flow of the first fuel into the engine when the engine is operating in the first mode; and a second ECU operatively connected to the first ECU; wherein the first ECU comprises: a signal receiver for receiving the first input signals, and an output for emitting a first output signal; and the second ECU being adapted to modify the first output signal when the engine is running in the second mode to produce a first modified signal and a second calculated signal.

Abstract: A multi-mode engine system comprising an engine adapted to operate in a plurality of different modes including a first mode in which the engine is fuelled substantially entirely by a first fuel, and a second mode in which the engine is fuelled substantially entirely by a second fuel, or by a mixture of the first and second fuels, the engine comprising: a first engine control unit (ECU) for controlling the flow of the first fuel into the engine when the engine is operating in the first mode; a plurality of first sensors operatively connected to the first ECU, each of which first sensors is adapted to sense a first variable, and to emit a first input signal dependent on a value of the sensed first variable; and a second ECU operatively connected to the first ECU; wherein the first ECU comprises: a signal receiver for receiving the first input signals, and an output for emitting a first output signal dependent on the first input signals, which first output signal determines the amount of first fuel supplied to t

Abstract: An exhaust system (10) for a dual fuel engine comprising a catalyst assembly comprising a first catalyst (4) comprising a methane oxidising catalyst and a second catalyst (6) comprising a selective catalytic reduction catalyst, the first catalyst (4) being positioned upstream of the second catalyst (6).