Device for controlling engine speed using dual governors
First Claim
1. An apparatus for controlling the minimum and maximum speed of an engine, the apparatus comprising:
- a minimum speed governor;
a maximum speed governor;
data processing means operable to provide a low idle speed error signal to the minimum speed governor, the low idle speed error signal being based on the difference between a desired low idle speed and engine speed;
the data processing means being further operable to provide a high idle speed error signal to the maximum speed governor, the high idle speed error signal being based on the difference between a desired high idle speed and engine speed;
the minimum speed governor being operable to provide a low idle fuel quantity signal; and
the maximum speed governor being operable to provide a high idle fuel quantity signal.
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Abstract
The present invention is an apparatus for controlling the fuel rate to an engine using the throttle position, and for controlling the speed of the engine using decision logic to choose the best alternative among candidate fuel levels. A minimum speed governor determines a minimum fuel level at a predetermined low idle engine speed, a maximum speed governor determines a maximum fuel level at a predetermined high idle engine speed, and at least one fuel rate map is used to determine fuel level based on various engine operating parameters. Each governor outputs a fuel quantity signal based on the difference between the corresponding desired engine speed and the actual engine speed. The fuel rate map may be a multi-dimensional data table that provides fuel quantity signals to optimize engine performance based on the throttle position, engine speed, boost pressure, and other engine operating states. The fuel quantity signals from the lookup tables and the maximum speed governor are compared and the minimum value is chosen. The minimum value is then compared to the fuel quantity signal from the minimum speed governor, and the maximum value between these signals is provided as the output signal from the speed governor portion of the engine'"'"'s electronic control module.
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Citations
20 Claims
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1. An apparatus for controlling the minimum and maximum speed of an engine, the apparatus comprising:
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a minimum speed governor; a maximum speed governor; data processing means operable to provide a low idle speed error signal to the minimum speed governor, the low idle speed error signal being based on the difference between a desired low idle speed and engine speed; the data processing means being further operable to provide a high idle speed error signal to the maximum speed governor, the high idle speed error signal being based on the difference between a desired high idle speed and engine speed; the minimum speed governor being operable to provide a low idle fuel quantity signal; and the maximum speed governor being operable to provide a high idle fuel quantity signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for controlling the minimum and maximum speed of an engine, the apparatus comprising:
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a minimum speed governor operable to output a low idle fuel quantity signal based on a desired low idle speed signal; a maximum speed governor operable to output a high idle fuel quantity signal based on a desired high idle speed signal; and means for selecting between the high idle fuel quantity signal and the low idle fuel quantity signal to provide a governor output fuel quantity signal to the engine. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for controlling the idle speed of a diesel engine, the apparatus comprising:
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an electronic control module operable to compute a high idle speed error signal based on engine speed and a desired high idle speed, the electronic control module being further operable to input the high idle speed error signal to a maximum speed governor, wherein the maximum speed governor includes a control law operable to generate a high idle fuel quantity signal based on the high idle speed error signal; the electronic control module being further operable to compute a low idle speed error signal based on engine speed and a desired low idle speed, the electronic control module being further operable to input the low idle speed error signal to a minimum speed governor, wherein the minimum speed governor includes a control law operable to generate a low idle fuel quantity signal based on the low idle speed error signal; and means for selecting between the high idle fuel quantity signal and the low idle fuel quantity signal to provide a governor output fuel quantity signal to the engine. - View Dependent Claims (19, 20)
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Specification