VEHICLE SPEED SENSOR DEVICE, ABS APPARATUS INCLUDING SAME, AND OPERATING METHOD THEREOF

1 . A vehicle speed sensor device, comprising:

a rechargeable battery;

a speed sensor configured to receive power from the battery and measure a rotational speed of a wheel bearing to generate a speed signal; and

a wireless signal transmitter configured to transmit the speed signal to an electronic controller through wireless communication.

2 . The vehicle speed sensor device according to claim 1 , wherein a transmission period of the speed signal is 50 μs or less.

3 . The vehicle speed sensor device according to claim 1 , further comprising:

a self-generator configured to be able to generate power from rotation of the wheel bearing and charge the battery using the generated power.

4 . The vehicle speed sensor device according to claim 3 , further comprising:

an external power supply module configured to supply power to the battery.

5 . The vehicle speed sensor device according to claim 4 , wherein:

the external power supply module comprises a capacitor capable of storing the power generated by the self-generator; and

the capacitor is configured to charge the battery when an output current of the self-generator is less than or equal to a predetermined value.

6 . The vehicle speed sensor device according to claim 5 , wherein:

the external power supply module further comprises a first wireless power transceiver connected to the capacitor and configured to transmit the power of the capacitor in a wireless manner; and

the vehicle speed sensor device further comprises a second wireless power transceiver configured to receive the power from the first wireless power transceiver provided in the external power supply module in a wireless manner and charge the battery using the received power.

7 . The vehicle speed sensor device according to claim 5 , wherein the self-generator is configured to charge the battery using the generated power when a charging level of the battery is less than or equal to a predetermined level and charge the capacitor using the generated power when the charging level of the battery exceeds the predetermined level.

8 . The vehicle speed sensor device according to claim 5 , wherein the external power supply module comprises one or more energy harvesting parts configured to convert an ambient energy source into power and store the converted power in the capacitor.

9 . The vehicle speed sensor device according to claim 8 , wherein the energy harvesting part comprises a piezoelectric element installed at a suspension and configured to generate power from a displacement of the suspension.

10 . The vehicle speed sensor device according to claim 8 , wherein the energy harvesting part comprises a photovoltaic element installed on an outer surface of the vehicle and configured to generate power from sunlight.

11 . An anti-lock brake system (ABS) apparatus having the vehicle speed sensor device according to any one of claims 1 to 10 , the ABS apparatus comprising:

the electronic controller,

wherein the electronic controller recognizes whether slip of a vehicle occurs using the speed signal transmitted from the wireless signal transmitter of the vehicle speed sensor device through wireless communication and controls a braking force of the vehicle based on whether the slip occurs.

12 . An operating method of a vehicle speed sensor device, comprising:

charging a rechargeable battery;

measuring a rotational speed of a wheel bearing via a speed sensor receiving power supplied from the battery and then generating a speed signal; and

transmitting the speed signal to an electronic controller via a wireless signal transmitter through wireless communication.

13 . The operating method according to claim 12 , wherein a transmission period of the speed signal is 50 μs or less.

14 . The operating method according to claim 12 , further comprising:

generating power from rotation of the wheel bearing through a self-generator; and

charging the battery using the power.

15 . The operating method according to claim 14 , further comprising:

supplying the power to the battery through an external power supply module.

16 . The operating method according to claim 15 , further comprising:

storing the power generated by the self-generator in a capacitor provided in the external power supply module; and

charging the battery by the capacitor when an output current of the self-generator is less than or equal to a predetermined value.

17 . The operating method according to claim 16 , wherein charging the battery by the capacitor comprises:

transmitting the power of the capacitor in a wireless manner by a first wireless power transceiver connected to the capacitor and provided in the external power supply module;

receiving the power from the first wireless power transceiver in a wireless manner by a second wireless power transceiver; and

charging the battery using the received power.

18 . The operating method according to claim 16 , further comprising:

charging the battery using the power generated by the self-generator when a charging level of the battery is less than or equal to a predetermined level; and

charging the capacitor using the power generated by the self-generator when the charging level of the battery exceeds the predetermined level.

19 . The operating method according to claim 16 , further comprising:

converting an ambient energy source into power by one or more energy harvesting parts provided in the external power supply module and storing the converted power in the capacitor.

20 . The operating method according to claim 19 , wherein converting of the ambient energy source into power by one or more energy harvesting and storing the converted power in the capacitor comprises:

generating power from a displacement of the suspension by a piezoelectric element installed at a suspension; and

storing the generated power in the capacitor.

21 . The operating method according to claim 19 , wherein converting of the ambient energy source into power by one or more energy harvesting and storing the converted power in the capacitor comprises:

generating power from sunlight by a photovoltaic element installed on an outer surface of a vehicle; and

storing the generated power in the capacitor.

22 . An operating method of an anti-lock brake system (ABS) apparatus having the operations of operating method of a vehicle speed sensor device according to any one of claims 12 to 21 , wherein the ABS apparatus comprises an electronic controller, the operating method comprising:

recognizing whether slip of a vehicle using the speed signal transmitted from the wireless signal transmitter of the vehicle speed sensor device through wireless communication; and

controlling a braking force of the vehicle based on whether the slip occurs.