Method and apparatus configured to maintain a desired engine emissions level
AssigneeCaterpillar Inc.
InventorsDarryl D. Baldwin, Sean R. Strubhar, Choy Yap
Life of this patent
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Abstract
The present invention is configured to maintain a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack is disclosed. The method includes the steps of establishing a desired emissions level, establishing an engine speed, establishing an engine load, establishing at least one characteristic of one of an intake air and an exhaust gas, and determining a fuel command in response to the engine speed, the engine load, and the desired emissions level, the fuel command resulting in the engine maintaining the desired emissions level.
Claims35
A method of maintaining a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack, comprising:
- establishing a desired emissions level;
- establishing an engine speed;
- establishing an engine load;
- establishing a pressure of an exhaust gas;
- establishing a temperature of an intake air;
- establishing a humidity of an intake air;
- determining a fuel command in response to said engine speed, said engine load, said desired emissions level, and said temperature, and said humidity of the intake air and said pressure of said exhaust gas, said fuel command resulting in the engine maintaining the desired emissions level.
A method of maintaining a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack, comprising the steps of:
- establishing a desired emissions level;
- establishing a desired rated oxygen exhaust level in response to said desired emissions level;
- establishing an engine speed;
- establishing an engine load;
- establishing an intake manifold temperature;
- establishing a stack pressure;
- determining a fuel command in response to said desired rated oxygen exhaust level, said engine speed, said engine load, said intake manifold temperature, and said stack pressure;
- thereby maintaining the desired emissions level.
A method of maintaining a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack, comprising:
- establishing a desired emissions level;
- establishing a desired rated oxygen exhaust level in response to said desired emissions level;
- establishing an engine speed;
- establishing an engine load;
- establishing an intake manifold temperature;
- measuring a specific humidity;
- establishing a pressure of the exhaust stack;
- determining a fuel command in response to said desired rated oxygen exhaust level, said engine speed, said engine load, said intake manifold temperature, and said stack pressure.
An apparatus configured to maintain a desired emissions level for an engine having an intake manifold and an exhaust manifold, and an exhaust stack, comprising:
- a speed sensing device configured to sense a speed of the engine and responsively generate a speed signal;
- an intake manifold temperature sensing device configured to sense a temperature of the intake manifold and responsively generate a temperature signal;
- a pressure sensing device configured to sense a pressure of the exhaust stack and responsively generate a pressure signal;
- a controller configured to receive said speed signal, said temperature signal, and said pressure signal, establish a desired rated oxygen level, establish an engine load, and determine a fuel command in response to said desired rated oxygen exhaust level, said engine speed, said engine load, said intake manifold temperature, and said stack pressure.
A method of operating an engine, comprising:
- determining a humidity of an intake air;
- determining a pressure of an exhaust mixture;
- determining a temperature of an intake air;
- determining an engine speed;
- determining an engine load;
- determining an oxygen concentration of an exhaust mixture as a function of the humidity of the intake air and pressure of the exhaust mixture;
- and
- determining a fuel command for the engine as a function of the oxygen concentration of the exhaust mixture.
A method for operating an engine, comprising:
- determining a humidity of an intake air;
- determining a pressure of an exhaust mixture;
- and
- determining a level of oxygen of an exhaust of the engine as a function of the humidity of the intake air and pressure of the exhaust mixture.
A method for operating an engine, comprising:
- determining a humidity of an intake air;
- determining a pressure of an exhaust mixture;
- and
- adjusting an air to fuel ratio of the engine as function of the humidity of the intake air and the pressure of the exhaust mixture.
Dependencies are inferred from the claim text.