Emissions control for an engine system

An engine system, comprising:

• an internal combustion engine having a fuel injector;
• and
• a control system configured to:
• inject fuel to the internal combustion engine from the fuel injector;
• and
• during at least an operating condition, limit injected fuel based on estimated engine airflow to a smoke-fuel limit, the smoke-fuel limit transiently adjusted from a first smoke-fuel limit to a second smoke-fuel limit based on a duration operating at the smoke-fuel limit.

An engine system, comprising:

• a diesel-fueled internal combustion engine having a common rail fuel injector and an exhaust system without a smoke sensor;
• and
• a control system configured to:
• inject fuel to the engine from the common rail fuel injector into a cylinder of the engine, where an amount of fuel to be injected is based on an estimated engine airflow, and where the control system estimates the amount of fuel actually injected, and further limit injected fuel based on the estimated fuel actually injected based on a smoke-fuel limit, the smoke-fuel limit only transiently adjusted from a first smoke-fuel limit to a second smoke-fuel limit based on a duration operating at the smoke-fuel limit.