Patent ID: 9708994
Date: 2017-07-18
CPC Classifications: F02D,Y02T

Claim:
1. A method of controlling combustion in an internal combustion engine with exhaust after treatment device, wherein upon detection of a request for a regeneration event of said exhaust after treatment device, a regeneration combustion mode comprising a pilot injection and a retarded main injection is operated, the method comprising the steps of: determining a desired torque to be produced by the engine; determining a maximum injected fuel quantity given by a stored smoke-limit map; determining a retard threshold as a maximum timing retard of the start of the main injection that will provide the desired torque without exceeding the maximum injected fuel quantity given by the stored smoke-limit map; and controlling the timing of the start of said main injection so that its retard is later than an injection timing that provides the best torque with the greatest efficiency and is not later than the retard threshold to provide the desired torque, while controlling an injected fuel quantity to provide the desired torque and to not exceed the maximum injected fuel quantity given by the stored smoke-limit map.