Apparatus for determining failure of vehicle antenna
View Patent ↗An on-vehicle device has a receiving antenna for receiving a radio signal from a mobile device, a receiving circuit for returning an electric signal obtained by conversion by the receiving antenna to the original state, a control unit for determining whether a received signal from the receiving circuit is correct or incorrect, a driving circuit that is driven in response to a driving signal from the control unit and supplies antenna current to a vehicle antenna, and a detector for detecting whether the vehicle antenna operates normally. A detection signal of the detector is fed back to the control unit through the receiving circuit, and the failure determination of the vehicle antenna is performed.
1. An on-vehicle device comprising:
a receiving antenna for receiving a radio signal from a mobile device;
a receiving circuit for returning an electric signal obtained by conversion by the receiving antenna to a state of an original transmitted signal supplied from the mobile device;
a control unit for determining whether a received signal from the receiving circuit is correct or incorrect;
a driving circuit that is driven in response to a driving signal from the control unit and supplies antenna current to a vehicle antenna; and
a detector for detecting whether the vehicle antenna operates normally,
wherein the detector is formed of a capacitor, and
wherein, when a detection signal of the detector for detecting a failure of the vehicle antenna is fed back to the control unit, the control unit determines a failure of the vehicle antenna based on the detection signal.
2. The on-vehicle device of claim 1 , wherein
one end of the capacitor is connected to a midpoint between the driving circuit and the vehicle antenna, and the other end of the capacitor is connected to the input side of the receiving circuit.
3. The on-vehicle device of claim 1 , wherein
the control unit stops operation of the driving circuit when the control unit determines that the vehicle antenna is failed.
4. The on-vehicle device of claim 1 , wherein
the control unit performs announcement when the control unit determines that the vehicle antenna is failed.