Method for determining a desired speed of a vehicle
AssigneeVolvo Truck Corporation
InventorsPer Johansson, Thomas Andersson, Anders Petersson
Life of this patent
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Abstract
The present invention relates to a method for determining a desired speed of a vehicle (1), preferably an autonomous vehicle. The vehicle comprises a shock absorber arrangement (2), preferably an hydraulic shock absorber arrangement, having an elastic hysteresis. The method comprises—obtaining (501) a reference value indicative of the energy dissipated by the shock absorber arrangement (2) in a reference driving condition of a vehicle and—determining (502) a speed of the vehicle for which the value indicative of the energy dissipated by the shock absorber arrangement (2) in a similar driving condition is expected to fall within a predetermined energy dissipation range, using said reference value.
Claims10
A method for determining a desired speed of a vehicle, the vehicle comprising a shock absorber arrangement having an elastic hysteresis, the method comprising:
- obtaining, by a control unit, a reference value indicative of the energy dissipated by the shock absorber arrangement in a reference driving condition of a vehicle, under a load cycle by:
- determining, by the control unit, a first set of accelerations or loads that cause one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed;
- determining, by the control unit, a second set of accelerations or loads that cause one or more displacements of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, the reference value indicative of the energy dissipated by the shock absorber arrangement using a difference between the second set of accelerations or loads that cause the one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed and the first set of accelerations or loads that cause the one or more displacement of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, using said reference value, a speed of the vehicle such that the amount of energy dissipated by the shock absorber arrangement under the reference driving condition is within a predetermined energy dissipation range.
A system for determining a desired speed of a vehicle, the vehicle comprising a shock absorber arrangement having an elastic hysteresis, the system being configured to:
- obtain, by a control unit, a reference value indicative of the energy dissipated by the shock absorber arrangement in a reference driving condition of a vehicle, under a load cycle by:
- determining, by the control unit, a first set of accelerations or loads that cause one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed;
- determining, by the control unit, a second set of accelerations or loads for that cause the one or more displacements of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, the reference value indicative of the energy dissipated by the shock absorber arrangement using a difference between the second set of accelerations or loads that cause the one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed and the first set of accelerations or loads that cause the one or more displacement of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, using said reference value, a speed of the vehicle such that the amount of energy dissipated by the shock absorber arrangement under the reference driving condition is within a predetermined energy dissipation range.
A vehicle comprising a system, the vehicle comprising a shock absorber arrangement having an elastic hysteresis, the system being configured to:
- obtain, by a control unit, a reference value indicative of the energy dissipated by the shock absorber arrangement in a reference driving condition of a vehicle, under a load cycle by:
- determining, by the control unit, a first set of accelerations or loads that cause one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed;
- determining, by the control unit, a second set of accelerations or loads that cause the one or more displacements of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, the reference value indicative of the energy dissipated by the shock absorber arrangement using a difference between the second set of accelerations or loads that cause the one or more displacements of the shock absorber arrangement when the shock absorber arrangement is compressed and the first set of accelerations or loads that cause the one or more displacement of the shock absorber arrangement when the shock absorber arrangement is expanded;
- and
- determining, by the control unit, using said reference value, a speed of the vehicle such that the amount of energy dissipated by the shock absorber arrangement under the reference driving condition is within a predetermined energy dissipation range.
Dependencies are inferred from the claim text.