Method of controlling an internal combustion engine
AssigneeDetroit Diesel Corporation
InventorsOliver A. Warner, Mark A. Zurawski, Andrew May
Life of this patent
Estimating the term…
Abstract
A method of controlling an internal combustion engine when the engine is operating in an engine braking mode is provided. The engine operates in the engine braking mode and an exhaust valve for the cylinder is prematurely opened to dissipate power. The method includes controlling airflow to at least one cylinder based on a comparison of a desired mass airflow rate and an actual mass airflow rate such that the actual mass airflow rate tracks the desired mass airflow rate.
Claims20
A method of controlling an internal combustion engine when the engine is operating in an engine braking mode, the engine having at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the method comprising:
- determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- comparing the desired mass airflow rate to the actual mass airflow rate:
- and
- controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein determining the actual mass airflow rate further comprises:
- determining an engine speed;
- determining an intake manifold air pressure;
- determining an intake manifold air temperature;
- determining a number of braking cylinders;
- determining a correction factor based on the number of braking cylinders;
- and
- determining the actual mass airflow rate based on the engine speed, the intake manifold air pressure, the intake manifold air temperature, and the correction factor.
A method of controlling an internal combustion engine when the engine is operating in an engine braking mode, the engine having at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the method comprising:
- determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- comparing the desired mass airflow rate to the actual mass airflow rate;
- and
- controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein the engine includes a variable geometry turbocharger, and wherein controlling the airflow further comprises:
- varying the geometry of the turbocharger based on the comparison.
A method of controlling an internal combustion engine when the engine is operating in an engine braking mode, the engine having, at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the method comprising:
- determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- comparing the desired mass airflow rate to the actual mass airflow rate;
- and
- controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein determining the desired mass airflow rate further comprises:
- determining a plurality of braking levels based on engine operating conditions;
- selecting a desired braking level from the plurality of braking levels;
- determining an engine speed;
- and
- determining the desired mass air flow rate based on the desired braking level, and the engine speed.
An internal combustion engine having an engine controller including a computer readable storage medium having instructions stored thereon that direct the engine controller to perform a method of controlling the internal combustion engine when the engine is operating in an engine braking mode, the engine having at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the medium further comprising:
- instructions for determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- instructions for determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- instructions for comparing the desired mass airflow rate to the actual mass airflow rate;
- and
- instructions for controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein the instructions for determining the actual mass airflow rate further comprise:
- instructions for determining an engine speed;
- instructions for determining an intake manifold air pressure;
- instructions for determining an intake manifold air temperature;
- instructions for determining a number of braking cylinders;
- instructions for determining a correction factor based on the number of braking cylinders;
- and
- instructions for determining the actual mass airflow rate based on the engine speed, the intake manifold air pressure, the intake manifold air temperature, and the correction factor.
An internal combustion engine having an engine controller including a computer readable storage medium having instructions stored thereon that direct the engine controller to perform a method of controlling the internal combustion engine when the engine is operating in an engine braking mode, the engine having at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the medium further comprising:
- instructions for determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- instructions for determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- instructions for comparing the desired mass airflow rate to the actual mass airflow rate:
- and
- instructions for controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein the engine includes a variable geometry turbocharger, and wherein the instructions for controlling the airflow further comprise:
- instructions for varying the geometry of the turbocharger based on the comparison.
An internal combustion engine having an engine controller including a computer readable storage medium having instructions stored thereon that direct the engine controller to perform a method of controlling the internal combustion engine when the engine is operating in an engine braking mode, the engine having at least one cylinder and an intake manifold that supplies a controllable airflow to the at least one cylinder, wherein when the engine is operating in the engine braking mode an exhaust valve for the cylinder is prematurely opened to dissipate power, the medium further comprising:
- instructions for determining a desired mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode;
- instructions for determining an actual mass airflow rate to the at least one cylinder when the engine is operating in the engine braking mode:
- instructions for comparing the desired mass airflow rate to the actual mass airflow rate;
- and
- instructions for controlling the airflow based on the comparison such that the actual mass airflow rate tracks the desired mass airflow rate, wherein the instructions for determining the desired mass airflow rate further comprise:
- instructions for determining a plurality of braking levels based on engine operating conditions;
- instructions for selecting a desired braking level from the plurality of braking levels;
- instructions for determining an engine speed;
- and
- instructions for determining the desired mass air flow rate based on the desired braking level, and the engine speed.
Dependencies are inferred from the claim text.