Device and method for determining a mapping of the torque transmitted by a clutch in an automobile and hill-start assistance system for an automobile equipped with such device
First Claim
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1. A device for determining, while a vehicle is running, a mapping of torque transmitted by a clutch fitted to the vehicle as a function of a position of a clutch control member, the device comprising:
- the mapping of torque transmitted by a clutch, the mapping being stored in a memory of an electronic control unit, the mapping including torque values between a minimum torque and a maximum torque as a function of the position of the clutch control member, the torque values being divided into a predetermined number of ranges with an average torque being determined for each of the ranges; and
updating means for updating the mapping as a function of position thresholds of the clutch control member, the position thresholds including a top threshold, which is a position of the clutch control member where the torque value is the maximum torque, a bottom threshold, which is a position of the clutch control member where the torque value is the minimum torque, and an intermediate threshold, which is a position of the clutch control member between the top threshold and the bottom threshold,wherein the updating means comprises computing means for modifying values of the position thresholds as a function of the minimum and maximum values of positions of the clutch control member recorded in the mapping, and of current values of the position thresholds, such that the torque values covered by each of the ranges changes when the top and bottom position thresholds change.
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Abstract
A device for determining, when driving a vehicle, a mapping of torque transmitted by a clutch of the automobile based on a position of a clutch control member. The device includes a mechanism updating the mapping based on position thresholds of the clutch control member. The updating modifies values of the thresholds based on minimum and maximum values of the positions of the control member stored in the mapping and on current values of the thresholds.
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Citations
10 Claims
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1. A device for determining, while a vehicle is running, a mapping of torque transmitted by a clutch fitted to the vehicle as a function of a position of a clutch control member, the device comprising:
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the mapping of torque transmitted by a clutch, the mapping being stored in a memory of an electronic control unit, the mapping including torque values between a minimum torque and a maximum torque as a function of the position of the clutch control member, the torque values being divided into a predetermined number of ranges with an average torque being determined for each of the ranges; and updating means for updating the mapping as a function of position thresholds of the clutch control member, the position thresholds including a top threshold, which is a position of the clutch control member where the torque value is the maximum torque, a bottom threshold, which is a position of the clutch control member where the torque value is the minimum torque, and an intermediate threshold, which is a position of the clutch control member between the top threshold and the bottom threshold, wherein the updating means comprises computing means for modifying values of the position thresholds as a function of the minimum and maximum values of positions of the clutch control member recorded in the mapping, and of current values of the position thresholds, such that the torque values covered by each of the ranges changes when the top and bottom position thresholds change. - View Dependent Claims (2, 3, 4, 9, 10)
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5. A system for assisting a hill start of a motor vehicle, comprising:
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a device for determining, while the vehicle is running, a mapping of torque transmitted by a clutch fitted to the vehicle as a function of a position of a clutch control member, the device comprising; the mapping of torque transmitted by a clutch, the mapping being stored in a memory of an electronic control unit, the mapping including torque values between a minimum torque and a maximum torque as a function of the position of the clutch control member, the torque values being divided into a predetermined number of ranges with an average torque being determined for each of the ranges, and updating means for updating the mapping as a function of position thresholds of the clutch control member, the position thresholds including a top threshold, which is a position of the clutch control member where the torque value is the maximum torque, a bottom threshold, which is a position of the clutch control member where the torque value is the minimum torque, and an intermediate threshold, which is a position of the clutch control member between the top threshold and the bottom threshold, wherein the updating means comprises computing means for modifying values of the position thresholds as a function of the minimum and maximum values of positions of the clutch control member recorded in the mapping, and of current values of the position thresholds, such that the torque values covered by each of the ranges changes when the top and bottom position thresholds change, a slope sensor; a controlled braking device; means for controlling the braking device; and means for estimating the torque to be supplied by the clutch to overcome forces of gravity, and a comparator of the torque to be supplied and of the torque supplied by the clutch, available in the mapping. - View Dependent Claims (6, 7)
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8. A method for determining a mapping of torque transmitted by a clutch fitted to a motor vehicle, as a function of a position of a clutch control member, comprising:
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mapping of torque transmitted by the clutch, the mapping being stored in a memory of an electronic control unit, the mapping including torque values between a minimum torque and a maximum torque as a function of the position of the clutch control member, the torque values being divided into a predetermined number of ranges with an average torque being determined for each of the ranges; and updating the mapping, while the vehicle is running, based on position thresholds of the clutch control member, the position thresholds including a top threshold, which is a position of the clutch control member where the torque value is the maximum torque, a bottom threshold, which is a position of the clutch control member where the torque value is the minimum torque, and an intermediate threshold, which is a position of the clutch control member between the top threshold and the bottom threshold, wherein during the updating, values of the position thresholds are modified as a function of minimum and maximum values of positions of the clutch control member recorded in the mapping, and of current values of the position thresholds, such that the torque values covered by each of the ranges changes when the top and bottom position thresholds change.
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Specification