METHOD AND SYSTEM FOR DETERMINING DIESEL ENGINE AIRFLOW IN AN ENGINE USING A LATE INTAKE VALVE CLOSURE STRATEGY

摘要

A method can determine diesel engine airflow in a diesel internal combustion engine using a late intake valve closure (LIVC) strategy. The method includes monitoring the air temperature in an intake manifold to determine an intake manifold air temperature; monitoring a coolant temperature; and determining the air temperature in an intake port of a diesel internal combustion engine. The method includes monitoring the air pressure in the intake manifold and monitoring the engine speed of the diesel internal combustion engine. Moreover, the method includes determining the air density in the diesel internal combustion engine and determining a diesel engine airflow; and determining an intake valve closure crank angle. The method additionally includes determining an adjusted diesel engine airflow based on the diesel engine airflow, engine speed, and intake valve closure crank angle.

主权项

1. A method for determining an adjusted diesel engine airflow in a diesel internal combustion engine using a late intake valve closure (LIVC) strategy, the method comprising:
monitoring air temperature in an intake manifold to determine an intake manifold air temperature; monitoring a coolant temperature; determining an air temperature in an intake port of the diesel internal combustion engine, wherein the intake port is in fluid communication with the intake manifold, and the air temperature in the intake port is based on the intake manifold air temperature and the coolant temperature; monitoring an air pressure in the intake manifold; monitoring an engine speed of the diesel internal combustion engine; determining an air density in the diesel internal combustion engine based on the air pressure in the intake manifold and the air temperature in the intake port; determining a diesel engine airflow based on the air density and the engine speed; determining an intake valve closure timing with respect to a crankshaft position of the diesel internal combustion engine in order to determine an intake valve closure crank angle, wherein an intake valve closure occurs after a piston of the diesel internal combustion engine reaches a bottom dead center of a compression stroke; and determining the adjusted diesel engine airflow based on the diesel engine airflow, the engine speed, and the intake valve closure crank angle.