Method for controlling a rolling mode or a freewheel mode of a vehicle
First Claim
1. A method for controlling a rolling or a freewheeling mode of a vehicle having a drive-train with a drive engine, an automatic or an automated transmission and a controllable shifting mechanism for interrupting a force flow in the drive-train, the method comprising:
- determining a current vehicle position,determining, with reference to topographical data, a first road stretch between the current vehicle position and a road stretch section ahead along which a speed limit applies,calculating, while driving with the drive-train engaged, a predicted speed variation with the force flow in the drive-train interrupted for the road stretch section ahead,determining, as a function of the predicted speed variation, a second road stretch, which the vehicle covers with the force flow interrupted until a value of the predicted speed variation at least approximately corresponds to a value of the speed limit ahead, anddetermining, taking into account the first and the second determined road stretches, a road stretch point ahead of the vehicle or a vehicle position for initiating the rolling or the freewheeling mode.
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Accused Products
Abstract
A method for controlling a rolling or a freewheeling mode of a vehicle having a drive-train with an engine, an automatic or automated transmission and controllable means for interrupting force flow in the drive-train. A current vehicle position and a first road stretch, between the current vehicle position and a road stretch section ahead along which a speed limit applies, are determined. While driving with the drive-train engaged, for the road stretch section ahead, a predicted speed variation, if the force flow in the drive-train is interrupted, is calculated and, based this speed variation, a second road stretch is determined which the vehicle, with the force flow interrupted covers, until a value of the predicted speed variation corresponds to a value of the speed limit ahead. With regard to the determined road stretches, a road stretch point for initiating the rolling or freewheeling mode is determined.
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Citations
10 Claims
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1. A method for controlling a rolling or a freewheeling mode of a vehicle having a drive-train with a drive engine, an automatic or an automated transmission and a controllable shifting mechanism for interrupting a force flow in the drive-train, the method comprising:
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determining a current vehicle position, determining, with reference to topographical data, a first road stretch between the current vehicle position and a road stretch section ahead along which a speed limit applies, calculating, while driving with the drive-train engaged, a predicted speed variation with the force flow in the drive-train interrupted for the road stretch section ahead, determining, as a function of the predicted speed variation, a second road stretch, which the vehicle covers with the force flow interrupted until a value of the predicted speed variation at least approximately corresponds to a value of the speed limit ahead, and determining, taking into account the first and the second determined road stretches, a road stretch point ahead of the vehicle or a vehicle position for initiating the rolling or the freewheeling mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. A transmission control unit of a transmission, designed to carry out steps of a method for controlling a rolling or freewheeling mode of a vehicle having a drive-train with a drive engine, an automatic or automated transmission and controllable shifting means for interrupting a force flow in the drive-train, the method including:
- determining a current vehicle position;
determining, with reference to topographical data, a first road stretch between the current vehicle position and a road stretch section ahead along which a speed limit applies;
calculating, while driving with the drive-train engaged, a predicted speed variation with the force flow in the drive-train interrupted for the road stretch section ahead;
determining, as a function of the predicted speed variation, a second road stretch, which the vehicle covers with the force flow interrupted until a value of the predicted speed variation corresponds at least approximately to a value of the speed limit ahead; and
determining, taking into account the first and the second determined road stretches, a road stretch point ahead of the vehicle or a vehicle position for initiating the rolling or freewheeling mode for interrupting the force flow in the drive-train.
- determining a current vehicle position;
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9. A control system of a vehicle, comprising a transmission control unit of a transmission, an engine control unit of a drive-train and a navigation device of the vehicle, which are interlinked with one another, wherein the transmission control unit carries out a method for controlling a rolling or freewheeling mode of a vehicle having the drive-train with a drive engine, an automatic or automated transmission and controllable shifting means for interrupting a force flow in the drive-train, the method including:
- determining a current vehicle position;
determining, with reference to topographical data, a first road stretch between the current vehicle position and a road stretch section ahead along which a speed limit applies;
calculating, while driving with the drive-train engaged, a predicted speed variation with the force flow in the drive-train interrupted for the road stretch section ahead;
determining, as a function of the predicted speed variation, a second road stretch, which the vehicle covers with the force flow interrupted until a value of the predicted speed variation corresponds at least approximately to a value of the speed limit ahead;
determining, taking into account the first and the second determined road stretches, a road stretch point ahead of the vehicle or a vehicle position for initiating the rolling or freewheeling mode for interrupting the force flow in the drive-train; and
the transmission control unit actuates shifting means for interrupting the force flow in the drive-train when the vehicle is at the road stretch point or at the vehicle position upon reaching which a force flow interruption is permitted.
- determining a current vehicle position;
Specification