Sensor assembly and apparatus

1. A sensor assembly comprising:

a housing;

an angle sensor provided in the housing; and

a moisture sensor provided in the housing,

wherein the moisture sensor comprises a ground electrode, a first input electrode, a second input electrode, and a control unit electrically connected to the ground electrode, the first input electrode, and the second input electrode to detect moisture,

the ground electrode, the first input electrode, and the second input electrode extend downward from the housing,

a lower end of the ground electrode, a lower end of the first input electrode, and a lower end of the second input electrode are exposed to an outside of the housing, and

the first input electrode extends downward to a different level compared to the second input electrode.

2. The sensor assembly according to claim 1 , wherein the first input electrode extends further downward compared to the second input electrode.

3. The sensor assembly according to claim 2 , wherein the ground electrode extends downward to a same level as the first input electrode.

4. The sensor assembly according to claim 1 , wherein the control unit is further configured to:

detect a first input-electrode voltage between the ground electrode and the first input electrode;

detect a second input-electrode voltage between the ground electrode and the second input electrode; and

output a water level detection signal based on the first input-electrode voltage and the second input-electrode voltage.

5. The sensor assembly according to claim 4 , wherein the control unit is configured to:

compare the first input-electrode voltage with a first reference voltage and

output a first water level detection signal.

6. The sensor assembly according to claim 4 , wherein the control unit is configured to:

compare the second input-electrode voltage with a second reference voltage and

output a second water level detection signal.

7. The sensor assembly according to claim 1 , wherein the control unit is further configured to:

detect a first input-electrode current between the ground electrode and the first input electrode;

detect a second input-electrode current between the ground electrode and the second input electrode; and

output a water level detection signal based on the first input-electrode current and the second input-electrode current.

8. The sensor assembly according to claim 1 , wherein the moisture sensor further comprises a third input electrode,

wherein the third input electrode extends downward from the housing,

a lower end of the third input electrode is exposed to the outside of the housing, and

the first input electrode, the second input electrode, and the third input electrode extend downward to varying levels, distinct from one another.

9. The sensor assembly according to claim 1 , wherein the moisture sensor further comprises a third input electrode,

the first input electrode extends further downward compared to the second input electrode, and

the second input electrode extends further downward compared to the third input electrode.

10. The sensor assembly according to claim 1 , wherein the moisture sensor further comprises an electrode protection part which is configured to encompass sides of the ground electrode, the first input electrode, and the second input electrode, with an open lower end.

11. An apparatus comprising:

a pinion shaft coupled to a rack housing in which a rack bar is installed and provided with a pinion gear engaged with a rack gear; and

a sensor assembly accommodated in the rack housing and coupled to the pinion shaft to detect a rotation angle of the pinion shaft,

wherein the sensor assembly comprises a housing, an angle sensor provided in the housing, and a moisture sensor provided in the housing,

the moisture sensor comprises a ground electrode, a first input electrode, a second input electrode, and a control unit electrically connected to the ground electrode, the first input electrode, and the second input electrode to detect moisture,

the ground electrode, the first input electrode, and the second input electrode extend downward from the housing,

a lower end of the ground electrode, a lower end of the first input electrode, and a lower end of the second input electrode are exposed to an outside of the housing, and

a height of the lower end of the first input electrode and a height of the lower end of the second input electrode, both measured from a bottom inner surface of a moisture storage tank of the rack housing, are different from each other.

12. The apparatus according to claim 11 , wherein the height of the lower end of the first input electrode is lower than the height of the lower end of the second input electrode.

13. The apparatus according to claim 12 , wherein a height of the lower end of the ground electrode measured from the bottom inner surface of the moisture storage tank of the rack housing is equal to the height of the lower end of the first input electrode.

14. The apparatus according to claim 11 , wherein the control unit is further configured to:

detect a first input-electrode voltage between the ground electrode and the first input electrode;

detect a second input-electrode voltage between the ground electrode and the second input electrode; and

output a water level detection signal based on the first input-electrode voltage and the second input-electrode voltage.

15. The apparatus according to claim 14 , wherein the control unit is configured to:

compare the first input-electrode voltage with a first reference voltage and

output a first water level detection signal.

16. The apparatus according to claim 14 , wherein the control unit is configured to:

compare the second input-electrode voltage with a second reference voltage and

output a second water level detection signal.

17. The apparatus according to claim 11 , wherein the lower end of the ground electrode, the lower end of the first input electrode, and the lower end of the second input electrode are arranged to be exposed in the water storage tank to collect moisture introduced into the rack housing.

18. A moisture detecting method performed by a sensor assembly comprising a housing, an angle sensor provided in the housing, and a moisture sensor provided in the housing, wherein the moisture sensor comprises a ground electrode, a first input electrode, a second input electrode, and a control unit, wherein the control unit is connected to the ground electrode, the first input electrode, and the second input electrode to detect the moisture, wherein the ground electrode, the first input electrode, and the second input electrode extend downward from the housing, wherein a lower end of the ground electrode, a lower end of the first input electrode, and a lower end of the second input electrode are exposed to an outside of the housing, and wherein the first input electrode extends downward to a different level compared to the second inpot electrode, the moisture detecting method comprising:

detecting a first input-electrode voltage between the ground electrode and the first input electrode;

detecting a second input-electrode voltage between the ground electrode and the second input electrode; and

outputting a water level detection signal based on the first input-electrode voltage and the second input-electrode voltage.

19. The moisture detecting method according to claim 18 , wherein the outputting of the water level detection signal comprises outputting a first water level detection signal by comparing the first input-electrode voltage with a first reference voltage.

20. The moisture detecting method according to claim 18 , wherein the outputting of the water level detection signal comprises outputting a second water level detection signal by comparing the second input-electrode voltage with a second reference voltage.