received by the International Bureau on 29 March 2018 (29.03.2018)

What is claimed is:

1. (Currently Amended) A multi-cylinder opposed piston engine system comprising:

at least one opposed piston cylinder ( 103) into which a mixture of combustible fuel and air is provided via an intake manifold ( 130) of an engine (100) to drive at least one crankshaft (1 14, 1 16);

at least one of: an oxygen sensor (132); a nitrogen oxide sensor ( 134); and a pressure sensor (1 18), both the oxygen sensor and the nitrogen oxide sensor being located within an exhaust passageway (146) of the at least one opposed piston cylinder ( 103), and the pressure sensor being in communication with the at least one opposed piston cylinder (103); and an engine control unit (102) operably coupled to the at least one of the oxygen sensor (132) and nitrogen oxide sensor (134) and operable to:

receive data from the at least one of the oxygen sensor (132) and nitrogen oxide sensor (134); and

adjust at least one operating condition of the multi-cylinder opposed piston engine system in response to the received data, the at least one operating condition relating to at least one of: a fuel injection timing, a fuel injection quantity, and an injection mix of at least two different fuel types.

2. (Original) The multi-cylinder opposed piston engine system of claim 1, wherein the adjusted at least one operating condition comprises one or more parameters relating to at least one of: a cylinder air, fuel, or ignition operation of the engine (100).

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3. (Withdrawn) A multi-cylinder opposed piston engine system comprising: at least one opposed piston cylinder ( 103) into which a mixture of combustible fuel and air is provided via an intake manifold (130) of an engine ( 100) to drive a first crankshaft (1 14) and a second crankshaft ( 1 16);

a first torque sensor (120, 122) coupled to one of the first crankshaft (1 14) and the second crankshaft (1 16); and

an engine control unit ( 102) operably coupled to the first torque sensor (120, 122) and operable to:

receive data from the first torque sensor (120, 122); and

adjust at least one operating condition of the multi-cylinder opposed piston engine system in response to the received data.

4. (Withdrawn) The multi -cylinder opposed piston engine system of claim 3 comprising:

a first noise, vibration, and harshness sensor (150) coupled to the first crankshaft (1 14); and

a second noise, vibration, and harshness sensor ( 152) coupled to the second crankshaft (1 16), wherein the engine control unit ( 102) is operably coupled to the first noise, vibration, and harshness sensor ( 150) and to the second noise, vibration, and harshness sensor (152).

5. (Withdrawn) A method of controlling a multi -cylinder opposed piston engine system, the method comprising:

receiving data from a first torque sensor (120) and a first speed sensor ( 124) each coupled to a first crankshaft (1 14);

2 receiving data from a second torque sensor ( 122) and a second speed sensor (126) each coupled to a second crankshaft (1 16); and

adjusting at least one operating condition of the multi-cylinder opposed piston engine system in response to the data received from the first torque sensor (120), the first speed sensor (124), the second torque sensor ( 122), and the second speed sensor ( 126).

6. (Withdrawn) The method of claim 5, further comprising determining at least one unacceptable engine operating condition in response to the received data, wherein adjusting the at least one operating condition of the multi-cylinder opposed piston engine system comprises adjusting at least one individual cylinder air, fuel, or ignition operation in response to the determined at least one unacceptable engine operating condition.

7. (Currently Amended) A method of controlling a multi -cylinder opposed piston engine system, the method comprising:

receiving data from at least one of an oxygen sensor (132) and a nitrogen oxide sensor (134) located within an exhaust passageway (146) of at least one opposed piston cylinder (103); and

adjusting at least one operating condition of the multi-cylinder opposed piston engine system in response to the received data, the at least one operating condition relating to at least one of: a fuel injection timing, a fuel injection quantity, and an injection mix of at least two different fuel types.

8. (Original) The method of claim 7, wherein adjusting the at least one operating condition of the multi-cylinder opposed piston engine system comprises adjusting at least one of fueling and air handling of a first opposed piston cylinder (202) to reduce output torque

3 variations between the first opposed piston cylinder (202) and a second opposed piston cylinder (204).

9. (Currently Amended) A multi-cylinder opposed piston engine system comprising:

at least two opposed piston cylinders (202, 204, 206) into which a mixture of combustible fuel and air is provided via intake ports (208, 210, 212) of an engine (100), and from which exhaust gases are released via exhaust ports (214, 216, 218);

at least one of: an oxygen sensor (236) and a nitrogen oxide sensor (238) located within an exhaust passageway downstream of an after treatment device (140) of the engine (100); and

an engine control unit ( 102) operably coupled to the at least one of: the oxygen sensor (236) and the nitrogen oxide sensor (238) and operable to:

receive data from the at least one of: the oxygen sensor (236) and the nitrogen oxide sensor (238); and

adjust at least one operating condition of the multi-cylinder opposed piston engine system in response to the received data.

10. (Canceled)

1 1. (Currently Amended) The multi -cylinder opposed piston engine system of claim 9, wherein the engine control unit ( 102) is operable to receive the data associated with a corresponding opposed piston cylinder (202, 204, 206) of the engine (100).

12-16. (Canceled)

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17. (Currently Amended) A method of controlling a multi -cylinder opposed piston engine system, the method comprising:

providing at least two opposed piston cylinders (202, 204, 206) into which a mixture of combustible fuel and air is provided via intake ports (208, 210, 212) of an engine ( 100), and from which exhaust gases are released via exhaust ports (214, 216, 218);

disposing at least one of: an oxygen sensor (236) and a nitrogen oxide sensor (238) within an exhaust passageway downstream of an after treatment device ( 140) of the engine (100);

operably coupling an engine control unit (102) to the at least one of: the oxygen sensor (236) and the nitrogen oxide sensor (238);

receiving data from the at least one of: the oxygen sensor (236) and the nitrogen oxide sensor (238); and

adjusting at least one operating condition of the multi-cylinder opposed piston engine system in response to the received data.

18-20. (Canceled)

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