Sensor system, vehicle control system and driver information system for vehicle safety
First Claim
1. A sensor system comprising:
- at least one laser sensor working with self-mixing interference comprising a plurality of Vertical Cavity Surface Emitting Laser sources adapted to emit laser radiation in essentially the same direction and a corresponding plurality of integrated photodiodes adapted to detect backscattered light from the emitted laser radiation, respectively;
at least one rotation sensor; and
an analyzer circuit,wherein the at least one laser sensor is adapted to generate first measurement data using self-mixing interference resulting from a first velocity component of a vehicle, the rotation sensor is adapted to generate rotational measurement data resulting from a first rotational velocity of a first wheel of the vehicle, and the analyzer circuit is adapted to receive the first measurement data generated by the at least one laser sensor and rotational measurement data generated the rotation sensor, and is further adapted to determine the first velocity component of the vehicle and the first rotational velocity of the first wheel of the vehicle using the first measurement data and the rotational measurement data.
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Accused Products
Abstract
A sensor system is described, using self-mixing laser sensors (10) and an analyzer circuit (30) in order to determine the velocity of a vehicle, such as a car, and the rotational velocity of a wheel (20) of the car. Deviations between the velocity of the vehicle and the rotational velocity of the wheel (20) can be used to determine sliding of the wheel (20) and, finally, the traction or, more specifically, the coefficient of driving friction between the wheel (20) and the surface the car is driving on. Furthermore, a vehicle control system is described, initiating test accelerations of a wheel (20) by means of a control circuit (50) and control means (300, 400) in order to determine the coefficient of driving friction during driving. The test accelerations initiate short periods of sliding of the wheel (20) and the sliding is detected by means of the sensor system.
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Citations
16 Claims
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1. A sensor system comprising:
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at least one laser sensor working with self-mixing interference comprising a plurality of Vertical Cavity Surface Emitting Laser sources adapted to emit laser radiation in essentially the same direction and a corresponding plurality of integrated photodiodes adapted to detect backscattered light from the emitted laser radiation, respectively; at least one rotation sensor; and an analyzer circuit, wherein the at least one laser sensor is adapted to generate first measurement data using self-mixing interference resulting from a first velocity component of a vehicle, the rotation sensor is adapted to generate rotational measurement data resulting from a first rotational velocity of a first wheel of the vehicle, and the analyzer circuit is adapted to receive the first measurement data generated by the at least one laser sensor and rotational measurement data generated the rotation sensor, and is further adapted to determine the first velocity component of the vehicle and the first rotational velocity of the first wheel of the vehicle using the first measurement data and the rotational measurement data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sensor system comprising:
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at least one laser sensor working with self-mixing interference comprising a plurality of Vertical Cavity Surface Emitting Laser diodes which are adapted to emit laser radiation in essentially the same direction and to generate measurement data resulting from a first velocity component of a vehicle; at least one rotation sensor adapted to generate measurement data resulting from a first rotational velocity of a first wheel of the vehicle; and an analyzer circuit adapted to receive the measurement data generated by the at least one laser sensor and the at least one rotation sensor, and to determine the first velocity component of the vehicle and the first rotational velocity of the first wheel of the vehicle using the first measurement data and the rotational measurement data, wherein the at least one laser sensor is further adapted to generate second measurement data with self-mixing interference resulting from a second velocity component of the vehicle different from the first velocity component, and the analyzer circuit is further adapted to determine the second velocity component of the vehicle using the second measurement data. - View Dependent Claims (12, 13)
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14. A sensor system of a vehicle, the system comprising:
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a first laser sensor comprising a first laser source configured to emit laser radiation and a first integrated detector configured to detect backscattered light from a surface on which the vehicle is driving, the laser sensor being configured to generate first measurement data, using self-mixing interference, resulting from as least one velocity component of the vehicle; a second laser sensor comprising a second laser source configured to emit laser radiation and a second integrated detector configured to detect backscattered light from a surface of a wheel of the vehicle, the second laser sensor being configured to generate second measurement data, using self-mixing interference, resulting from a rotational velocity of the wheel of the vehicle; and an analyzer circuit configured to receive the first and second measurement data generated by the first and second laser sensors, respectively, and to determine the at least one velocity component of the vehicle and the first rotational velocity of the first wheel of the vehicle. - View Dependent Claims (15, 16)
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Specification