Abstract: An antenna driving apparatus drives an antenna by applying to the antenna a drive voltage having a rectangular waveform switching between a high voltage value and a low voltage value in a predetermined cycle. The antenna driving apparatus includes a high-voltage side switch, a low-voltage side switch, a duty ratio acquisition unit, a drive voltage application unit and a duty ratio switching unit. The duty ratio acquisition unit acquires a set value of a duty ratio as a time ratio at which the drive voltage is at the high voltage value in the rectangular waveform. The drive voltage application unit applies to the antenna the drive voltage by repeating execution of turning the high-voltage side switch into the nonconductive state. The duty ratio switching unit alternately executes switching of the duty ratio between a first duty ratio and a second duty ratio.

Abstract: A circuit fault detection apparatus includes an AD conversion circuit, a corrector, first and second determination devices, and a fault detector. The AD conversion circuit detects a voltage corresponding to a current or a voltage applied to the circuit fault detection element, and converts the voltage to a digital value. The corrector corrects a measurement value to a corrected measurement value. The first determination device determines whether or not the electric circuit has the fault, based on a comparison between an uncorrected measurement value and an uncorrected threshold value. The second determination device determines whether the electric circuit has the fault, based on a comparison between the corrected measurement value and a corrected threshold value. The fault detector detects the fault in the electric circuit, based on a condition that at least one of the first or second determination devices determines that the electric circuit has the fault.

Abstract: A circuit fault detection apparatus includes an AD conversion circuit, a corrector, a threshold value setting device and a fault detector. The AD conversion circuit detects a voltage corresponding to a current flowing through a circuit fault detection element connected to the electric circuit or a voltage applied to the circuit fault detection element, and converts the voltage to a digital value. The corrector corrects the digital value or a measurement value as a voltage value representative of the digital value to a corrected measurement value. The threshold value setting device sets a threshold value closer to a normal value side than a limit value of the corrected measurement value determined based on a convertible range of the AD conversion circuit. The fault detector detects whether the fault occurs in the electric circuit, based on comparison between the threshold value and the corrected measurement value.

Abstract: A circuit fault detection apparatus includes an AD conversion circuit, a corrector, first and second determination devices, and a fault detector. The AD conversion circuit detects a voltage corresponding to a current or a voltage applied to the circuit fault detection element, and converts the voltage to a digital value. The corrector corrects a measurement value to a corrected measurement value. The first determination device determines whether or not the electric circuit has the fault, based on a comparison between an uncorrected measurement value and an uncorrected threshold value. The second determination device determines whether the electric circuit has the fault, based on a comparison between the corrected measurement value and a corrected threshold value. The fault detector detects the fault in the electric circuit, based on a condition that at least one of the first or second determination devices determines that the electric circuit has the fault.

Abstract: An antenna driving apparatus drives an antenna by applying to the antenna a drive voltage having a rectangular waveform switching between a high voltage value and a low voltage value in a predetermined cycle. The antenna driving apparatus includes a high-voltage side switch, a low-voltage side switch, a duty ratio acquisition unit, a drive voltage application unit and a duty ratio switching unit. The duty ratio acquisition unit acquires a set value of a duty ratio as a time ratio at which the drive voltage is at the high voltage value in the rectangular waveform. The drive voltage application unit applies to the antenna the drive voltage by repeating execution of turning the high-voltage side switch into the nonconductive state. The duty ratio switching unit alternately executes switching of the duty ratio between a first duty ratio and a second duty ratio.

Abstract: A laser sensor is located close to a rotation axis of a vehicle door and configured to emit a laser beam to a surface of the vehicle door and accept reflected light reflected from an obstacle for scanning a scanning plane shifted in a door-opening direction, in which the vehicle door is openable. A determination section determines whether an obstacle, which is possible to make contact with the vehicle door, exists in the door-opening direction of the vehicle door, based on a result of emission and acceptance of the laser beam of the laser sensor. An opening regulating section regulates an opening of the vehicle door in response to determination of the determination section that the obstacle exists.

Abstract: A distance measuring sensor is arranged to a vehicle door, and measures a distance to an object in a direction corresponding to a scanning angle. A memory stores a standard angle and a comparison distance corresponding to the scanning angle. A distance-shortest scanning angle is defined by the shortest value of the measured distance. When the distance-shortest scanning angle is different from the standard angle, the scanning angle is corrected. The object is determined to be an obstacle having a possibility to contact with the door, when the measured distance is equal to or shorter than a corrected comparison distance corresponding to the corrected scanning angle.

Abstract: A laser sensor projects laser light in the downward direction. If the laser sensor does not receive any laser light reflected by an obstacle or the ground, it is determined that the obstacle is present in the direction of projection of the laser light. It is thus possible to detect the presence of the obstacle, which will at least affect the opening of the vehicle door.

Abstract: A laser sensor projects laser light in the downward direction. If the laser sensor does not receive any laser light reflected by an obstacle or the ground, it is determined that the obstacle is present in the direction of projection of the laser light. It is thus possible to detect the presence of the obstacle, which will at least affect the opening of the vehicle door.

Abstract: A distance measuring sensor is arranged to a vehicle door, and measures a distance to an object in a direction corresponding to a scanning angle. A memory stores a standard angle and a comparison distance corresponding to the scanning angle. A distance-shortest scanning angle is defined by the shortest value of the measured distance. When the distance-shortest scanning angle is different from the standard angle, the scanning angle is corrected. The object is determined to be an obstacle having a possibility to contact with the door, when the measured distance is equal to or shorter than a corrected comparison distance corresponding to the corrected scanning angle.

Abstract: A laser sensor is located close to a rotation axis of a vehicle door and configured to emit a laser beam to a surface of the vehicle door and accept reflected light reflected from an obstacle for scanning a scanning plane shifted in a door-opening direction, in which the vehicle door is openable. A determination section determines whether an obstacle, which is possible to make contact with the vehicle door, exists in the door-opening direction of the vehicle door, based on a result of emission and acceptance of the laser beam of the laser sensor. An opening regulating section regulates an opening of the vehicle door in response to determination of the determination section that the obstacle exists.