Object detection device for an automotive vehicle
First Claim
1. A detection device for detecting an object in a detection area of an automotive vehicle comprising:
- at least a pair of sensor pads, each sensor pad serving as an electric field transmitter, an electric field receiver and an impedance measurer; and
a driven rail impedance measuring system including an inverter, an oscillator, a power supply rail driver with two DC voltage offset follower amplifier outputs for power supply rails of the inverter and a plurality of switches, the driven rail impedance measuring system changing a sensor pad function from the electric field transmitter to the electric field receiver or the impedance measurer by connecting or disconnecting the oscillator to or from an input of the power supply rail driver of the inverter;
an object being detected in the detection area when there is a capacitance variation or an impedance variation between the sensor pads of the at least one pair.
1 Assignment
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Accused Products
Abstract
A detection device for detecting an object by measuring the capacitance variation of the detection device includes at least a pair of sensor pads, each sensor pad being able to transmit or to receive an electric field. Each sensor pad can be used to measure the impedance variation of the pad, each sensor pad being driven by a driven rail impedance measuring system including an inverter, an oscillator, a power supply rail driver and switches, the measuring system being able to change the sensor pad function from electric field transmitter to electric field receiver or impedance measurer by turning on and off the oscillator to the input of the power supply rail driver of the inverter.
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Citations
12 Claims
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1. A detection device for detecting an object in a detection area of an automotive vehicle comprising:
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at least a pair of sensor pads, each sensor pad serving as an electric field transmitter, an electric field receiver and an impedance measurer; and a driven rail impedance measuring system including an inverter, an oscillator, a power supply rail driver with two DC voltage offset follower amplifier outputs for power supply rails of the inverter and a plurality of switches, the driven rail impedance measuring system changing a sensor pad function from the electric field transmitter to the electric field receiver or the impedance measurer by connecting or disconnecting the oscillator to or from an input of the power supply rail driver of the inverter; an object being detected in the detection area when there is a capacitance variation or an impedance variation between the sensor pads of the at least one pair. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification