System and method of controlling exhaust temperature

A method of modulating air supply to a combustion chamber of an internal combustion engine to regenerate a clean emission module at an engine load of 20-90%, the method comprising:

• providing a flow of air from an air inlet to a compressor via a first passage;
• providing a flow of compressed air from the compressor to the combustion chamber of the engine via a second passage;
• and
• adjusting a flow control device provided between the compressor and the combustion chamber to selectively reduce an amount of compressed air provided to the combustion chamber such that the air to fuel ratio in the combustion chamber is between 15:1 and 18:1 during a regeneration period.

An internal combustion engine system comprising:

• an engine defining a combustion chamber
• a clean emission module fluidly connected to an exhaust conduit from combustion chamber;
• and
• an air supply unit configured to supply air into the combustion chamber, the air supply unit including:
• a compressor configured to receive air from an air inlet via a first passage, the compressor further configured to supply compressed air into the combustion chamber via a second passage;
• a flow control device provided between the compressor and the combustion chamber of the engine, the flow control device being configured to selectively reduce the supply of compressed air into the combustion chamber;
• and
• a controller operatively coupled to the flow control device and configured to control the flow control device based on a predetermined engine parameter such that an air to fuel ratio in the combustion chamber is maintained between 15:1 to 18:1 at 20-90% engine load during a regeneration period for the clean emissions module.