Method and apparatus for determining a valve operator position
First Claim
Patent Images
1. A method comprising the steps of:
- determining a base position for an exhaust gas recirculation valve for an internal combustion engine;
adjusting the base position based on at least one of current transient speed conditions and current transient load conditions of the internal combustion engine, yielding a valve operator position signal;
adjusting the valve operator position signal for pressure at an air intake of the internal combustion engine;
sending the valve operator position signal to the exhaust gas recirculation valve.
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Abstract
A valve operator position is determined for an exhaust gas recirculation valve (117) for an internal combustion engine (101). The valve position may be adjusted (313) for transient engine speed conditions and/or adjusted (309) for transient engine load conditions. During high transient states, the EGR valve is closed more, to allow more air to reach the cylinders of the engine, thereby improving engine performance.
15 Citations
20 Claims
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1. A method comprising the steps of:
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determining a base position for an exhaust gas recirculation valve for an internal combustion engine; adjusting the base position based on at least one of current transient speed conditions and current transient load conditions of the internal combustion engine, yielding a valve operator position signal; adjusting the valve operator position signal for pressure at an air intake of the internal combustion engine; sending the valve operator position signal to the exhaust gas recirculation valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising the steps of:
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determining a load and an engine speed for an internal combustion engine; determining at least one of a load transient multiplier based on current transient load conditions for the internal combustion engine and a speed transient multiplier based on current transient speed conditions for the internal combustion engine; determining a valve operator position for an exhaust gas recirculation valve for the internal combustion engine based on the load, the engine speed, and at least one of the load transient multiplier and the speed transient multiplier; adjusting the valve operator position for pressure at an air intake of the internal combustion engine. - View Dependent Claims (9, 10, 11)
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12. An apparatus comprising:
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an exhaust gas recirculation valve having an operator, wherein the exhaust gas recirculation valve is arranged and constructed to receive a valve operator position signal and adjust the operator to a position conveyed in the valve operator position signal; a base operator position determiner, arranged and constructed to receive an engine speed value and an engine load value and to generate a base operator position; a load transient multiplier determiner, arranged and constructed to receive the engine speed value and an engine load transient value and to generate a load transient multiplier; a speed transient multiplier determiner, arranged and constructed to receive the engine speed value and an engine speed transient value and to generate a load transient multiplier; a combiner, operably coupled to the exhaust gas recirculation valve, base operator position determiner, the load transient multiplier determiner, and the speed transient multiplier determiner, wherein the combiner is arranged and constructed to combine the base operator position, the load transient multiplier, and the load transient multiplier, yielding a desired operator position signal; a boost adjuster, arranged and constructed to adjust the desired operator position signal based on air pressure at an intake manifold; wherein the valve operator position signal is based on the desired operator position signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification