System and method for low speed lateral control of a vehicle
First Claim
1. A method for providing low speed lateral steering control for an autonomously driven or semi-autonomously driven vehicle, the method comprising:
- receiving, from at least one vehicle sensor, sensor data corresponding to a road wheel angle;
determining, by one or more data processors, a plurality of waypoints indicating a planned vehicle path of travel;
defining, by the one or more data processors, a road wheel angle search range based at least in part on a maximum road wheel angle rate;
determining, by the one or more data processors, a steering control goal using the road wheel angle that tracks and measures a difference between a current vehicle path and the planned vehicle path and defining a relationship between a steering command and a cost function, the cost function including a cost associated with a radial error and a cost associated with a heading error;
determining, by the one or more data processors, an optimal steering control signal using the road wheel angle and the steering control goal; and
providing the control signal to a steering controller.
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Abstract
A method for providing low speed lateral steering control for a vehicle is disclosed. The method includes receiving sensor data corresponding to a road wheel angle, determining a planned vehicle path of travel, defining a road wheel angle search range based on a maximum road wheel angle rate, determining a steering control goal using the road wheel angle that tracks and measures a difference between a current vehicle path and the planned vehicle path, determining an optimal steering control signal using the road wheel angle and the steering control goal and providing the control signal to a steering controller.
2 Citations
14 Claims
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1. A method for providing low speed lateral steering control for an autonomously driven or semi-autonomously driven vehicle, the method comprising:
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receiving, from at least one vehicle sensor, sensor data corresponding to a road wheel angle; determining, by one or more data processors, a plurality of waypoints indicating a planned vehicle path of travel; defining, by the one or more data processors, a road wheel angle search range based at least in part on a maximum road wheel angle rate; determining, by the one or more data processors, a steering control goal using the road wheel angle that tracks and measures a difference between a current vehicle path and the planned vehicle path and defining a relationship between a steering command and a cost function, the cost function including a cost associated with a radial error and a cost associated with a heading error; determining, by the one or more data processors, an optimal steering control signal using the road wheel angle and the steering control goal; and providing the control signal to a steering controller. - View Dependent Claims (2, 3, 4)
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5. An automotive vehicle, comprising:
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a steering system; at least one vehicle sensor; a controller electrically connected to the steering system and the at least one vehicle sensor, the controller configured to receive, from the at least one vehicle sensor, sensor data corresponding to a road wheel angle; determine a plurality of waypoints indicating a planned vehicle path of travel; define a road wheel angle search range based at least in part on a maximum road wheel angle rate; determine a steering control goal using the road wheel angle that tracks and measures a difference between a current vehicle path and the planned vehicle path and defining a relationship between a steering command and a cost function, the cost function including a cost associated with a radial error and a cost associated with a heading error; determine an optimal steering control signal using the road wheel angle and the steering control goal; and provide the control signal to the steering system. - View Dependent Claims (6, 7, 8)
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9. A method for providing low speed lateral control to an automotive vehicle, the method comprising:
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receiving, from a vehicle sensor, sensor data corresponding to a road wheel angle; determining, by one or more data processors, a plurality of waypoints indicating a planned vehicle path of travel; defining, by the one or more data processors, a road wheel angle search range based on a maximum road wheel angle rate of change; designing a steering control goal using a cost function that reduces a difference between a current vehicle path and the planned vehicle path, wherein the cost function includes a cost associated with a radial error and a cost associated with a heading error, and wherein the cost function can be expressed in a nonsingular form as a function of the road wheel angle, one or more vehicle geometric parameters, and the plurality of waypoints; determining an optimal steering control signal by minimizing the cost function subject to a constraint driven by the maximum road wheel angle rate; and providing the control signal to a steering controller. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification