Method and device for measuring the angle of rotation of the steering shaft of a motor vehicle
First Claim
1. A method for measuring the angle of rotation of a steering shaft of a motor vehicle with an angular position sensor emitting a signal varying between two extremes and representing the relative position of the shaft, comprising the steps of:
- measuring the speed VV of the vehicle;
comparing the speed VV to a predetermined speed VM;
zeroing a shaft rotation counter for counting rotations of the shaft when VV is greater than VM;
detecting the direction of movement of the shaft to a position corresponding to an extreme of the signal emitted by the sensor, in order to increment or decrement the counter according to the direction detected; and
combining the number of turns recorded in the counter with the current signal emitted by the sensor in order to form a signal representing the angle of rotation of the steering shaft.
1 Assignment
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Accused Products
Abstract
The method consists in measuring the speed, VV, of the vehicle, in comparing the current speed, VV, to a predetermined speed, VM, in order to zero a shaft turn counter when, VV, is greater than, VM. VM, is updated to the value, VV, when, VV, is greater than, VM. The direction of movement of a steering shaft in the vehicle into a position corresponding to an extreme of the signal emitted by an angular position sensor coupled to the shaft and sensitive to the angular position of the shaft during one turn is detected, in order to increment or decrement the counter according to the direction detected. The number of turns recorded is combined with the current signal, VS, emitted by the sensor in order to form a signal representing the angle of rotation of the steering shaft, during several turns. The implementation of the method is a device for controlling, for example, an adaptable suspension for a motor vehicle.
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Citations
17 Claims
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1. A method for measuring the angle of rotation of a steering shaft of a motor vehicle with an angular position sensor emitting a signal varying between two extremes and representing the relative position of the shaft, comprising the steps of:
- measuring the speed VV of the vehicle;
comparing the speed VV to a predetermined speed VM;
zeroing a shaft rotation counter for counting rotations of the shaft when VV is greater than VM;
detecting the direction of movement of the shaft to a position corresponding to an extreme of the signal emitted by the sensor, in order to increment or decrement the counter according to the direction detected; and
combining the number of turns recorded in the counter with the current signal emitted by the sensor in order to form a signal representing the angle of rotation of the steering shaft. - View Dependent Claims (2, 3, 4, 5)
- measuring the speed VV of the vehicle;
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6. A device for measuring the angle of rotation of a steering shaft of a motor vehicle, having an angular position sensor coupled in rotation with the steering shaft so as to emit a signal, VS, varying between two extremes and representing the relative position of the shaft, comprising:
- a speed sensor for measuring the speed, VV, of the vehicle;
a shaft rotation counter for recording the number of turns of the steering shaft;
a comparator for comparing the speed, VV, of the vehicle to a predetermined speed, VM, the comparator having an output;
means for zeroing the counter when VV is greater than VM;
means for detecting the movement and the direction of rotation of the steering shaft to an angular position corresponding to an extreme of the signal emitted by the sensor;
means for incrementing or decrementing the counter according to the direction detected; and
means for combining the count of the counter and the signal, VS, emitted by the sensor in order to form a signal representing the angle of rotation of the steering shaft. - View Dependent Claims (7, 8, 9, 10, 11)
- a speed sensor for measuring the speed, VV, of the vehicle;
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12. A device for implementing a method for measuring the angle of rotation of a steering shaft of a motor vehicle with an angular position sensor which emits a signal varying between two extremes and representing the relative position of the shaft, comprising:
- an angular position sensor coupled in rotation with the steering shaft so as to emit a signal, VS, representing the relative position of the shaft during one turn;
a speed sensor on the vehicle for measuring the speed, VV, of the vehicle and outputting a signal representative thereof;
a shaft rotation counter;
a comparator for receiving the speed, VV, of the vehicle and a predetermined speed, VM;
means for zeroing the shaft rotation counter when VV is greater than VM, the shaft rotation counter connected to an output of the comparator;
means for detecting the movement and the direction of rotation of the steering shaft to an angular position corresponding to an extreme of the signal emitted by the angular position sensor;
means for incrementing or decrementing the counter according to the direction detected; and
means for combining the count of the counter and the signal, VS, emitted by the angular position sensor in order to form a signal representing the angle of rotation of the steering shaft. - View Dependent Claims (13, 14, 15, 16, 17)
- an angular position sensor coupled in rotation with the steering shaft so as to emit a signal, VS, representing the relative position of the shaft during one turn;
Specification