Electronic car bumper
First Claim
1. An electronic car bumper comprising:
- a plurality of sensors, provided in a car bumper, each including sensor plates, a first loading coil coupled to one of said sensor plates, and a first divided capacitor coupled to said loading coil;
a reference resonance circuit including a reference capacitor, a second loading coil coupled to said reference capacitor and a second divided capacitor coupled to said second loading coil;
an oscillator which selectively drives any one of said sensors and said reference resonance circuit through a switch device;
a detector for detecting an output of said oscillating portion;
a discriminator for discriminating an output of said detector and providing a corresponding discriminating signal as a first output associated with said sensors and a second output associated with said reference resonance circuit;
a synchronous means for switching said switch device and said first and second outputs of said discriminator in synchronization;
a direct current amplifier for amplifying the first output of said discriminator associated with said sensors, in which an output of the amplifier is adjusted to a point at zero as a reference voltage according to the second output of said discriminator portion associated with said reference resonance circuit; and
a comparator which compares an output of said direct current amplifier with a threshold reference which is adjusted according to said reference voltage.
1 Assignment
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Accused Products
Abstract
A plurality of sensitive high-frequency proximity switches are provided in the bumper of a car and obstacles can be accurately identified. The electronic car bumper includes: a plurality of sensor portions each having sensor plates, first loading coils, and a divided capacitor, and a reference resonance circuit having a reference capacitor, a second loading coil and a divided capacitor. An oscillator drives each of the sensor portions and the reference resonance circuit through switching devices, and a detector detects an output of the oscillator. A discrimination portion discriminates an output of the detector and provides a discriminated signal to an output portion corresponding to the sensors and the reference resonance circuit. A synchronous device switches the switching device and the discriminator portion in synchronization. A direct current amplifier has an output which is adjusted to a point at zero as a reference voltage for the output corresponding to the reference resonance circuit, and a comparator is adjusted to a threshold reference according to the reference voltage.
76 Citations
14 Claims
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1. An electronic car bumper comprising:
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a plurality of sensors, provided in a car bumper, each including sensor plates, a first loading coil coupled to one of said sensor plates, and a first divided capacitor coupled to said loading coil; a reference resonance circuit including a reference capacitor, a second loading coil coupled to said reference capacitor and a second divided capacitor coupled to said second loading coil; an oscillator which selectively drives any one of said sensors and said reference resonance circuit through a switch device; a detector for detecting an output of said oscillating portion; a discriminator for discriminating an output of said detector and providing a corresponding discriminating signal as a first output associated with said sensors and a second output associated with said reference resonance circuit; a synchronous means for switching said switch device and said first and second outputs of said discriminator in synchronization; a direct current amplifier for amplifying the first output of said discriminator associated with said sensors, in which an output of the amplifier is adjusted to a point at zero as a reference voltage according to the second output of said discriminator portion associated with said reference resonance circuit; and a comparator which compares an output of said direct current amplifier with a threshold reference which is adjusted according to said reference voltage. - View Dependent Claims (2, 3, 4)
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5. An electronic car bumper comprising:
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a plurality of sensors, located in a car bumper, each comprising sensor plates and a first loading coil connected to one of said sensor plates; a reference resonance circuit comprising a reference capacitor and a second loading coil connected to said reference capacitor; a plurality of oscillators respectively connected to said plurality of sensors and said reference resonance circuit; a plurality of first switches respectively connecting said plurality of oscillators to a power supply; a discriminating portion for discriminating and gating outputs of said plurality of oscillators corresponding to said plurality of sensors and said reference resonance circuit through a plurality of second switches; a synchronous means for switching said first and second switches in synchronization; and comparators which are connected to said plurality of second switches and which compare outputs corresponding to said plurality of sensors with a reference voltage corresponding to an output from said reference resonance circuit. - View Dependent Claims (6, 7)
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8. An electronic car bumper employing a high-frequency proximity switch including sensor plates comprising:
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parallel first and second plate electrodes which confront each other and are mounted in a bumper of a car, said first plate electrode confronting an object to be detected and including at least spaced apart first and second sub-plate electrodes each being parallel to and confronting said second plate electrode; an oscillation circuit and a tuning circuit respectively connected to said first and second sub-plate electrodes; a detector which detects a high-frequency output generated from said tuning circuit caused by a high-frequency current flowing in said oscillation circuit; and a means for detecting an obstacle according to a change of the high-frequency output. - View Dependent Claims (9, 10, 11, 12)
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13. An electronic car bumper employing a high-frequency proximity switch, which comprises:
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a main sensor portion having sensing plates composed of parallel plate electrodes directed toward an object sensing area; and a sub-sensor portion having sensing plates composed of parallel electrodes directed either vertically downward or obliquely downward relative to the object sensing area; wherein said main sensor portion and said sub-sensor portion are arranged such that a part of a ground surface within a sensitivity distribution range of said main sensor portion is included within a sensitivity distribution range of said sub-sensor portion after movement of said electronic car bumper along the ground surface so as to remove, from a detection signal obtained from an oscillation output of said main sensor portion, noise caused by unevenness of the ground surface and obtained from an oscillation output of said sub-sensor portion.
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14. An electronic car bumper employing a high-frequency proximity switch, which comprises:
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a main sensor portion having sensing plates composed of parallel electrodes directed toward an object sensing area and being mounted in a car bumper; a sub-sensor portion having sensing plates composed of parallel electrodes directed either vertically downward or obliquely downward relative to the object sensing area and being mounted in the car bumper; a first oscillator connected to said main sensor portion; a second oscillator connected to said sub-sensor portion; a first detector for detecting an output of said first oscillator; a second detector for detecting an output of said second oscillator; a first automatic resetting-type amplifier for amplifying an output of said first detector; a second automatic resetting-type amplifier for amplifying an output of said second detector; a first comparator outputting a detection signal by comparing the output from said first automatic resetting-type amplifier with a first reference signal; and a second comparator outputting a reset pulse by comparing the output from said second automatic resetting-type amplifier with a second reference signal so as to input the reset pulse to said first automatic resetting-type amplifier.
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Specification