Precipitation detection

1. A method, comprising:

determining, from sensor data in a vehicle, an amount of precipitation on a windshield, a type of precipitation, and a speed of the vehicle;

determining an amount of precipitation on a ground surface based on the amount of precipitation on the windshield and the speed of the vehicle;

determining a total amount of precipitation including a sum of the amount of precipitation on the windshield and the amount of precipitation on the ground; and

actuating a component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.

2. The method of claim 1 , further comprising:

determining a wiper speed based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle;

wherein actuating the component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, includes actuating the component based on the wiper speed.

3. The method of claim 2 , wherein the component is a wiper, and actuating the component includes actuating the wiper according to the wiper speed.

4. The method of claim 2 , further comprising:

determining a second wiper speed based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle;

wherein actuating the component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, includes actuating the component based on the second wiper speed.

5. The method of claim 2 , further comprising determining the wiper speed based further on an accuracy range of a precipitation sensor.

6. The method of claim 1 , wherein the component is one or both of a vehicle powertrain component and a vehicle brake component, and actuating the component includes changing the speed of the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.

7. The method of claim 1 , further comprising:

determining a wind speed relative to the vehicle;

determining the amount of precipitation on the ground based further on the wind speed;

wherein actuating the component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, further includes actuating the component based on the wind speed.

8. The method of claim 1 , wherein the component is a vehicle steering component, and actuating the component includes activating the vehicle steering component.

9. A system, comprising a processor; and a memory, the memory storing instructions executable by the processor to:

determine, from sensor data in a vehicle, an amount of precipitation on a windshield, a type of precipitation, and a speed of the vehicle;

determine an amount of precipitation on a ground surface based on the amount of precipitation on the windshield and the speed of the vehicle;

determine a total amount of precipitation including a sum of the amount of precipitation on the windshield and the amount of precipitation on the ground; and

actuate a component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.

10. The system of claim 9 , wherein the processor is further programmed to determine a wiper speed based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, and to actuate the component based on the wiper speed.

11. The system of claim 10 , wherein the component is a wiper, and the processor is further programmed to actuate the wiper according to the wiper speed.

12. The system of claim 10 , wherein the processor is further programmed to determine a second wiper speed based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, and to actuate the component based on the second wiper speed.

13. The method of claim 2 , further comprising determining the wiper speed based further on an accuracy range of a precipitation sensor.

14. The system of claim 9 , wherein the component is one or both of a vehicle powertrain component and a vehicle brake component, and wherein the processor is further programmed to change the speed of the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.

15. The system of claim 9 , wherein the processor is further programmed to determine a wind speed relative to the vehicle, determine the amount of precipitation on the ground based further on the wind speed, and to actuate the component based further on the wind speed.

16. The system of claim 9 , wherein the component is a vehicle steering component, and the processor is further programmed to activate the vehicle steering component.

17. A system comprising;

a wiper;

an actuator arranged to move the wiper; and

a processor programmed to:

determine, from sensor data in a vehicle, an amount of precipitation on a windshield, a type of precipitation, and a speed of the vehicle;

determine an amount of precipitation on a ground surface based on the amount of precipitation on the windshield and the speed of the vehicle;

determine a total amount of precipitation including a sum of the amount of precipitation on the windshield and the amount of precipitation on the ground; and

actuate a component in the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.

18. The system of claim 17 , wherein the processor is further programmed to determine a wiper speed based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle, and actuate the component based on the wiper speed.

19. The method of claim 2 , further comprising determining the wiper speed based further on an accuracy range of a precipitation sensor.

20. The system of claim 17 , wherein the component is one or both of a vehicle powertrain component and a vehicle brake component, and the processor is further programmed to change the speed of the vehicle based on the total amount of precipitation, the type of precipitation, and the speed of the vehicle.