Control strategy for computer-controlled steering
First Claim
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1. A method for controlling a steering assembly of a vehicle comprising the steps of:
- analyzing a current vehicle driving-scenario as indicated by signals from a plurality of sensors;
determining a desired steering wheel resist torque that should be felt by a driver of the vehicle, said desired steering wheel resist torque based upon the current vehicle driving-scenario;
sensing an actual steering wheel resist torque that is be felt by the vehicle driver;
comparing the actual steering wheel resist torque with the desired steering wheel resist torque;
calculating a steering assist force which is required to be applied to the steering assembly in order to make the actual steering wheel resist torque substantially equal to the desired steering wheel resist torque; and
activating a motor to apply the steering assist force to the steering assembly.
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Abstract
A steering system and control system for controlling an assist force imposed to the steering assembly of a vehicle, so as to deliver a steering wheel resist torque that can be felt by the vehicle driver and a method for the same, wherein the actual steering wheel resist torque is compared with a desired steering wheel resist torque, whereupon the actual steering wheel resist torque is adapted to be substantially the same as the desired steering wheel resist torque through adapting the amount of said assist force.
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Citations
12 Claims
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1. A method for controlling a steering assembly of a vehicle comprising the steps of:
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analyzing a current vehicle driving-scenario as indicated by signals from a plurality of sensors;
determining a desired steering wheel resist torque that should be felt by a driver of the vehicle, said desired steering wheel resist torque based upon the current vehicle driving-scenario;
sensing an actual steering wheel resist torque that is be felt by the vehicle driver;
comparing the actual steering wheel resist torque with the desired steering wheel resist torque;
calculating a steering assist force which is required to be applied to the steering assembly in order to make the actual steering wheel resist torque substantially equal to the desired steering wheel resist torque; and
activating a motor to apply the steering assist force to the steering assembly. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for a steering assembly of a vehicle comprising:
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a plurality of sensors operative to detect vehicle parameters and generate signals indicating a current vehicle driving-scenario;
a generator operatively connected to the plurality of sensors to receive the signals and calculate a desired steering wheel resist torque that should be felt by a driver of the vehicle;
a torque estimator measuring an actual resist torque felt by the driver;
a comparator receiving the desired steering wheel resist torque from the generator and receiving the actual resist torque from the torque estimator and calculating a difference signal therefrom;
at least one controller receiving the difference signal and calculating a steering assist force which is required to be applied to the steering assembly in order to make the actual steering wheel resist torque substantially equal to the desired steering wheel resist torque; and
a motor to apply the steering assist force to the steering assembly. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification