System and method for estimating the driving style of a vehicle
First Claim
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1. A system for estimating a driving style of a vehicle, comprising:
- a device for measuring vehicle longitudinal acceleration (ax) and lateral acceleration (ay) along a measuring path;
a memory module in which admissible limit values pairs of the longitudinal and lateral accelerations are memorized so to form a closed admissible acceleration curve in a longitudinal acceleration-lateral acceleration plane;
an elaboration module configured for;
associating to each measured longitudinal acceleration-lateral acceleration pair of the vehicle a corresponding longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve;
providing an indication of the driving style on a basis of a trend of position of the measured longitudinal acceleration-lateral acceleration pair with respect to the corresponding longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve along the measuring path,wherein the elaboration module comprises a calculation module for calculating;
a first distance (D1) along a line between a point representing the longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve and an axes origin of a longitudinal acceleration-lateral acceleration plane;
a second distance (D2) along a line between a point representing the measured longitudinal acceleration-lateral acceleration pair and the axes origin of the longitudinal acceleration-lateral acceleration plane;
a safety index (SI, Cia) representing the driving style on a basis of a comparison between trends of the first distance (D1) and the second distance (D2) along the measuring path, andwherein the calculation module is further configured to determine;
an ideal accelerations module (AImod), calculated as a minimum between the first (D1) and second (D2) distances;
a real accelerations module (ARmod), calculated as a sum of the ideal accelerations module (AImod) with a penalty coefficient (Cp) which increases when a difference between the second (D2) and the first (D1) distances increases and which is null if the second distance (D2) is less than or equal to the first distance (D1);
an ideal accelerations module integral (IAI) in a time domain corresponding to the measuring path; and
the real accelerations module integral (IAR) in the time domain corresponding to the measuring path;
the safety index (SI, Cia) representing the driving style on a basis of a difference between the real accelerations module integral (IAR) and the ideal accelerations module integral (IAI).
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Abstract
A system (1) and method estimates the driving style of a vehicle. The system includes;
- a device for measuring the longitudinal acceleration (ax) and lateral acceleration (ay) of a vehicle along a measuring path;
- a memory module (7) in which pairs of the admissible limit values of the longitudinal and lateral accelerations are stored. Such values implement an admissible acceleration curve, closed in a longitudinal acceleration-lateral acceleration plane;
- an elaboration module (6) configured for:
- associating to each measured longitudinal acceleration-lateral acceleration pair of the vehicle a corresponding longitudinal acceleration-lateral acceleration pair on said admissible acceleration curve; and
- providing an indication of the driving style on the basis of the trend of position of the measured longitudinal acceleration-lateral acceleration pair with respect to the corresponding longitudinal acceleration-lateral acceleration pair on the admissible acceleration curve along the measuring path.
3 Citations
11 Claims
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1. A system for estimating a driving style of a vehicle, comprising:
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a device for measuring vehicle longitudinal acceleration (ax) and lateral acceleration (ay) along a measuring path; a memory module in which admissible limit values pairs of the longitudinal and lateral accelerations are memorized so to form a closed admissible acceleration curve in a longitudinal acceleration-lateral acceleration plane; an elaboration module configured for; associating to each measured longitudinal acceleration-lateral acceleration pair of the vehicle a corresponding longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve; providing an indication of the driving style on a basis of a trend of position of the measured longitudinal acceleration-lateral acceleration pair with respect to the corresponding longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve along the measuring path, wherein the elaboration module comprises a calculation module for calculating; a first distance (D1) along a line between a point representing the longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve and an axes origin of a longitudinal acceleration-lateral acceleration plane; a second distance (D2) along a line between a point representing the measured longitudinal acceleration-lateral acceleration pair and the axes origin of the longitudinal acceleration-lateral acceleration plane; a safety index (SI, Cia) representing the driving style on a basis of a comparison between trends of the first distance (D1) and the second distance (D2) along the measuring path, and wherein the calculation module is further configured to determine; an ideal accelerations module (AImod), calculated as a minimum between the first (D1) and second (D2) distances; a real accelerations module (ARmod), calculated as a sum of the ideal accelerations module (AImod) with a penalty coefficient (Cp) which increases when a difference between the second (D2) and the first (D1) distances increases and which is null if the second distance (D2) is less than or equal to the first distance (D1); an ideal accelerations module integral (IAI) in a time domain corresponding to the measuring path; and the real accelerations module integral (IAR) in the time domain corresponding to the measuring path; the safety index (SI, Cia) representing the driving style on a basis of a difference between the real accelerations module integral (IAR) and the ideal accelerations module integral (IAI). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for estimating a driving style of a vehicle, comprising the steps of:
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measuring a longitudinal acceleration (ax) and a lateral acceleration (ay) of the vehicle along a measuring path; associating to each measured longitudinal acceleration-lateral acceleration pair of the vehicle a corresponding longitudinal acceleration-lateral acceleration pair on a closed admissible acceleration curve in a longitudinal acceleration-lateral acceleration plane; providing an indication of the driving style on a basis of a trend of a position of the measured longitudinal acceleration-lateral acceleration pair with respect to the corresponding longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve along the measuring path, wherein the step of providing an indication of the driving style comprises the steps of; calculating a first distance (D1) along a line between a point representing the longitudinal acceleration-lateral acceleration pair on the closed admissible acceleration curve and a longitudinal acceleration-lateral acceleration plane axes origin; calculating a second distance (D2) along a line between a point representing the measured longitudinal acceleration-lateral acceleration pair and the longitudinal acceleration-lateral acceleration plane axes origin; determining a safety index (SI, Cia), representing the driving style on a basis of a comparison between trends of the first distance (D1) and the second distance (D2) in a time domain corresponding to the measuring path; determining an ideal accelerations module (AImod), calculated as a minimum between the first (D1) and second (D2) distances; determining a real accelerations module (ARmod), calculated as a sum of an ideal accelerations module (AImod) with a penalty coefficient (Cp), which increases when a difference between the second (D2) and the first (D1) distances increases and which is null if the second distance (D2) is less than or equal to the first distance (D1); calculating an ideal accelerations module integral (IAI) in the time domain corresponding to the measuring path; calculating a real accelerations module integral (IAR) in the time domain corresponding to the measuring path; and determining the safety index (SI, Cia), representing the driving style on a basis of a difference between the real accelerations module integral (IAR) and the ideal accelerations module integral (IAI). - View Dependent Claims (9, 10, 11)
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Specification