Method and system for predicting a future position of a vehicle using numerical integration
First Claim
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1. A method for predicting a future position of an automotive vehicle having a steering control comprising the steps of:
- determining the position of the vehicle at time T0,determining the translational and rotational speeds of the vehicle at time T0,determining the translational and rotational accelerations of the vehicle at time T0,determining an angle of the steering control at time T0,creating a mathematical model of the vehicle using the position, speeds, accelerations and steering control angle at time T0,calculating the position of the vehicle at a horizon time T0+Th through numerical integration of the mathematical model,wherein said calculating step further comprises the steps of;
calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a first order of accuracy utilizing a step size Tstep,calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a second order of accuracy,determining a truncation error between the first and second order of the calculated position of the vehicle at time T0+Th,adjusting Tstep as a function of the determined truncation error.
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Abstract
A method and system for predicting a future position of a horizon time Th of an automotive vehicle. The method determines the position of the vehicle at time T0 using GPS and the speed, acceleration and angle of the steering wheel at time T0 from appropriate sensors on the vehicle. A nonlinear mathematical model utilizing these factors is then created while the position of the vehicle at time T0+Th is determined through numerical integration of the mathematical model using an adjustable step size Tstep. The step Tstep is modified adaptively in accordance with the accuracy requirements of the vehicle.
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Citations
19 Claims
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1. A method for predicting a future position of an automotive vehicle having a steering control comprising the steps of:
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determining the position of the vehicle at time T0, determining the translational and rotational speeds of the vehicle at time T0, determining the translational and rotational accelerations of the vehicle at time T0, determining an angle of the steering control at time T0, creating a mathematical model of the vehicle using the position, speeds, accelerations and steering control angle at time T0, calculating the position of the vehicle at a horizon time T0+Th through numerical integration of the mathematical model, wherein said calculating step further comprises the steps of; calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a first order of accuracy utilizing a step size Tstep, calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a second order of accuracy, determining a truncation error between the first and second order of the calculated position of the vehicle at time T0+Th, adjusting Tstep as a function of the determined truncation error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for predicting a future position of an automotive vehicle having a steering control comprising:
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means for determining the position of the vehicle at time T0, means for determining the translational and rotational speeds of the vehicle at time T0, means for determining the translational and rotational accelerations of the vehicle at time T0, means for determining an angle of the steering control at time T0, means for creating a mathematical model of the vehicle using the position, speeds, accelerations and steering control angle at time T0, means for calculating the position of the vehicle at a horizon time T0+Th through numerical integration of the mathematical model, wherein said means for calculating further comprises; means for calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a first order of accuracy using step size Tstep, means for calculating the position of the vehicle at time T0+Th through numerical integration of the mathematical model of a second order of accuracy, means for determining a truncation error between the first and second order of the calculated position of the vehicle at time T0+Th, means for adjusting Tstep as a function of the determined truncation error. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification