Cruise control governor using optimal droop selection logic
First Claim
1. A cruise control governor operable to maintain a set speed of a vehicle by commanding fueling to an engine of the vehicle according to a plurality of goal droop curves, wherein at least one of the plurality of goal droop curves is dynamically defined during operation of the vehicle;
- andwherein the plurality of goal droop curves comprise;
an isochronous droop curve which coincides with the set speed and is bounded by a first point below a full torque curve of the vehicle and by a second point above a zero torque curve of the vehicle;
a top standard droop curve which is bounded by the first point and by a third point on the full torque curve;
a top dynamic droop curve which is dynamically defined during operation of the vehicle and is bounded by a fourth point on the full torque curve to the left of the third point and by a fifth point on the isochronous droop curve between the first and second points;
a bottom standard droop curve which is bounded by the second point and by a sixth point on the zero torque curve; and
a bottom dynamic droop curve which is dynamically defined during operation of the vehicle and is bounded by a seventh point on the zero torque curve to the right of the sixth point and by an eighth point on the isochronous droop curve between the second and fifth points.
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Accused Products
Abstract
A cruise control governor which is able to dynamically define and switch between various goal droop curves in order to find the best goal droop curve for use with the current vehicle driving situation. For instance, the present invention will dynamically define and select different goal droop curves when the vehicle is lugging up a hill, coasting down a hill, cruising on level ground, preparing to crest a hill, or preparing to transition off of a downhill slope.
57 Citations
9 Claims
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1. A cruise control governor operable to maintain a set speed of a vehicle by commanding fueling to an engine of the vehicle according to a plurality of goal droop curves, wherein at least one of the plurality of goal droop curves is dynamically defined during operation of the vehicle;
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wherein the plurality of goal droop curves comprise; an isochronous droop curve which coincides with the set speed and is bounded by a first point below a full torque curve of the vehicle and by a second point above a zero torque curve of the vehicle; a top standard droop curve which is bounded by the first point and by a third point on the full torque curve; a top dynamic droop curve which is dynamically defined during operation of the vehicle and is bounded by a fourth point on the full torque curve to the left of the third point and by a fifth point on the isochronous droop curve between the first and second points; a bottom standard droop curve which is bounded by the second point and by a sixth point on the zero torque curve; and a bottom dynamic droop curve which is dynamically defined during operation of the vehicle and is bounded by a seventh point on the zero torque curve to the right of the sixth point and by an eighth point on the isochronous droop curve between the second and fifth points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification