System and method for testing crash avoidance technologies
First Claim
1. A Guided Soft Target (GST) system comprising:
- a subject vehicle (SV) with a SV position sensor;
a dynamic motion element (DME) with a DME position sensor wherein the DME comprises a body comprising an upper surface wherein the upper surface is adapted to support a soft-body having the size and shape of a vehicle or a portion of a vehicle, the body having at least one tapered side so as to allow the subject vehicle to drive up to and on the upper surface with minimal to no damage to the subject vehicle or the DME, the body further supported by a plurality of wheels;
a SV trajectory file representing the trajectory of the SV, comprising an array of SV waypoints and SV speeds;
a DME trajectory file representing the trajectory of the DME, comprising a second array of DME waypoints and DME speeds, each DME waypoint and DME speed corresponds to a SV waypoint and SV speed in the SV trajectory file;
a processor, adapted to perform the following steps;
(a) determine a location of the SV from the SV position sensor and the position of the DME from the DME position sensor;
(b) calculate the position of the SV along trajectory represented by the SV trajectory file and determine the SV waypoint for that position in the SV trajectory file;
(c) determine the corresponding DME waypoint from the DME trajectory file;
(d) calculate the longitudinal error of the DME; and
(e) calculate a speed compensation based on the longitudinal error.
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Abstract
A Guided Soft Target System is disclosed that includes a subject vehicle and a dynamic motion element (DME). The subject vehicle may be accelerated at an arbitrary rate to a speed corresponding to the speed in its own predetermined trajectory. Each of the DME vehicles computes its target speed as a ratio of the subject vehicle'"'"'s speed at each waypoint location, and modulates its speed control to achieve this target speed. To further compensate for timing differences along the target path, each DME computes its longitudinal error along the path relative to its target position, as dictated by the position of the subject vehicle within its own trajectory, and each DME'"'"'s target speed is modulated in order to minimize the longitudinal error along the predetermined trajectory.
22 Citations
20 Claims
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1. A Guided Soft Target (GST) system comprising:
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a subject vehicle (SV) with a SV position sensor; a dynamic motion element (DME) with a DME position sensor wherein the DME comprises a body comprising an upper surface wherein the upper surface is adapted to support a soft-body having the size and shape of a vehicle or a portion of a vehicle, the body having at least one tapered side so as to allow the subject vehicle to drive up to and on the upper surface with minimal to no damage to the subject vehicle or the DME, the body further supported by a plurality of wheels; a SV trajectory file representing the trajectory of the SV, comprising an array of SV waypoints and SV speeds; a DME trajectory file representing the trajectory of the DME, comprising a second array of DME waypoints and DME speeds, each DME waypoint and DME speed corresponds to a SV waypoint and SV speed in the SV trajectory file; a processor, adapted to perform the following steps; (a) determine a location of the SV from the SV position sensor and the position of the DME from the DME position sensor; (b) calculate the position of the SV along trajectory represented by the SV trajectory file and determine the SV waypoint for that position in the SV trajectory file; (c) determine the corresponding DME waypoint from the DME trajectory file; (d) calculate the longitudinal error of the DME; and (e) calculate a speed compensation based on the longitudinal error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling the speed of a dynamic motion element (DME) used in testing a crash avoidance technology of a subject vehicle (SV), the DME connected to a processor, wherein the processor is connected to a memory, the method comprising:
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(a) providing a DME comprising a body comprising an upper surface wherein the upper surface is adapted to support a soft-body having the size and shape of a vehicle or a portion of a vehicle, the body having at least one tapered side so as to allow the subject vehicle to drive up to and on the upper surface with minimal to no damage to the subject vehicle or the DME, the body further supported by a plurality of wheels (b) storing a SV trajectory file in the memory representing the trajectory of the SV, comprising an array of SV waypoints and SV speeds; (c) storing a DME trajectory file in the memory representing the trajectory of the DME, comprising a second array of DME waypoints and DME speeds, each DME waypoint and DME speed corresponds to a SV waypoint and SV speed in the SV trajectory file; (d) determining, by the processor, an actual location of the SV and the actual position of the DME; (d) calculating, by the processor, the position of the SV along trajectory represented by the SV trajectory file and determine the SV waypoint for that position in the SV trajectory file; (f) determining, by the processor, the corresponding DME waypoint from the DME trajectory file; (g) calculating, by the processor, the longitudinal error of the DME; and (h) calculating, by the processor, a speed compensation based on the longitudinal error. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A Dynamic Motion Element (DME) for use in testing crash avoidance technologies in a subject vehicle, the DME comprising:
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a body comprising an upper surface wherein the upper surface is adapted to support a soft-body having the size and shape of a vehicle or portion of a vehicle, the body having at least one tapered side so as to allow the subject vehicle to drive up to and on the upper surface with minimal to no damage to the subject vehicle or the DME, the body supported by a plurality of wheels, including at least one motorized wheel coupled to an electronic controller, and at least one steerable wheel coupled with the electronic controller; and wherein the electronic controller is adapted to track the trajectory of the subject vehicle, and steers the at least one steerable wheel to place the DME on a collision course with the subject vehicle. - View Dependent Claims (18, 19, 20)
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Specification