Method and device for controlling a cruise control governor in a vehicle
First Claim
1. A method for controlling 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, where the 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 engine and by a second point above a zero torque curve of the engine;
a top droop curve which is bounded by the first point and by a third point on the full torque curve;
a bottom droop curve which is bounded by the second point and by a fourth point on the zero torque curve, the method comprising the steps of;
performing command according to the droop curves;
registering that the vehicle soon will enter an uphill slope;
estimating in a vehicle position before entering the uphill slope if a downshift in a transmission of the vehicle will occur when travelling the uphill slope during a coming time period (testimation);
if the downshift is estimated to occur then performing a fuel saving action during the time period in order to avoid the downshift, where the fuel saving action being to during the time period performing command according to a second isochronous curve instead of performing command according to at least one of or both of the top and bottom droop curves.
1 Assignment
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Accused Products
Abstract
A method for controlling a cruise control operable to maintain a set speed of a vehicle according to a plurality of goal droop curves is provided. The goal droop curves include: an isochronous droop curve; a top droop curve; and a bottom droop curve. The method includes performing command according to the droop curves; registering that the vehicle soon will enter an uphill slope; estimating in a vehicle position before entering the uphill slope if a downshift in a transmission of the vehicle will occur when traveling the uphill slope during a coming time period (testimation); if the downshift is estimated to occur then performing a fuel saving action during the time period in order to avoid the downshift. The fuel saving action is one of an adaptation of transmission downshifting limits or to during the time period performing command according to a second isochronous curve.
8 Citations
16 Claims
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1. A method for controlling 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, where the goal droop curves comprise:
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an isochronous droop curve which coincides with the set speed and is bounded by a first point below a full torque curve of the engine and by a second point above a zero torque curve of the engine; a top droop curve which is bounded by the first point and by a third point on the full torque curve; a bottom droop curve which is bounded by the second point and by a fourth point on the zero torque curve, the method comprising the steps of; performing command according to the droop curves; registering that the vehicle soon will enter an uphill slope; estimating in a vehicle position before entering the uphill slope if a downshift in a transmission of the vehicle will occur when travelling the uphill slope during a coming time period (testimation); if the downshift is estimated to occur then performing a fuel saving action during the time period in order to avoid the downshift, where the fuel saving action being to during the time period performing command according to a second isochronous curve instead of performing command according to at least one of or both of the top and bottom droop curves. - View Dependent Claims (2, 3, 4, 7, 8, 9, 10, 11)
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5. A method for controlling 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, where the goal droop curves comprise;
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an isochronous droop curve which coincides with the set speed and is bounded by a first point below a full torque curve of the engine and by a second point above a zero torque curve of the engine; a top droop curve which is hounded by the first point and by a third point on the full torque curve; a bottom droop curve which is bounded by the second point and by a fourth point on the zero torque curve, the method comprising the steps of; performing command according to the droop curves; registering that the vehicle soon will enter an uphill slope; estimating in a vehicle position before entering the uphill slope if a downshift in a transmission of the vehicle will occur when travelling the uphill slope during a coming time period (testimation); if the downshift is estimated to occur then performing a fuel saving action during the time period in order to avoid the downshift, where the fuel saving action being an adaptation of downshifting limits of the transmission in order to avoid downshifting limits to occur at or above the top droop curve. - View Dependent Claims (6, 12, 13, 14, 15, 16)
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Specification