Water injection device, in particular of an internal combustion engine, and method for operating such a water injection device
A water injection device, in particular of an internal combustion engine, includes a water tank for storing water, a conveying element connected to the water tank for conveying water, at least one water injector connected to the conveying element for injecting water, and a water quality and water fill level detection device for detecting a quality of the water in the water tank and a fill level of the water tank.
1. A water injection device comprising:
a water tank configured to store water;
a conveying element connected to the water tank and configured to convey water;
at least one water injector connected to the conveying element and configured to inject water; and
a water quality and water level detection device configured to detect a quality of water in the water tank and a fill level of the water tank,
wherein the water quality and water level detection device includes a first ultrasonic sensor, which is configured to determine a density of the water to detect the water quality.
2. The water injection device as claimed in claim 1 , wherein:
the water quality and water level detection device includes an electrochemical sensor having two electrodes disposed in the water tank;
a first electrode of the two electrodes is equipped with a capacitor; and
in order to detect the water quality, the water quality and water level detection device is configured to determine a conductivity of the water based on charging and discharging of the capacitor.
3. The water injection device as claimed in claim 2 , wherein the water quality and water level detection device is configured to apply a voltage pulse to the two electrodes to charge the capacitor.
4. The water injection device as claimed in claim 2 , wherein the water quality and water level detection device is configured to determine the conductivity cyclically.
5. The water injection device as claimed in claim 2 , wherein the water quality and water level detection device is configured to determine the conductivity of the water only at a known fill level if the fill level is greater than a predetermined fill level.
6. The water injection device as claimed in claim 1 , wherein the water quality and water level detection device includes a second ultrasonic sensor configured to determine the fill level of the water tank for a known density of the water from a transition time of an ultrasonic pulse up to the surface of the water.
7. The water injection device as claimed in claim 6 , wherein:
the water quality and water level detection device includes a temperature sensor configured to detect a temperature of the water; and
the temperature of the water is taken into account when determining the fill level.
8. The water injection device as claimed in claim 1 , wherein:
the water quality and water level detection device includes a float element and a sensor; and
the sensor is configured to determine a position of the float element.
9. The water injection device as claimed in claim 1 , wherein the water injection device is of an internal combustion engine.
10. A water injection device comprising:
a water tank configured to store water;
a conveying element connected to the water tank and configured to convey water;
at least one water injector connected to the conveying element and configured to inject water; and
a water quality and water level detection device configured to detect a quality of water in the water tank and a fill level of the water tank,
wherein the water quality and water level detection device includes a second ultrasonic sensor configured to determine the fill level of the water tank for a known density of the water from a transition time of an ultrasonic pulse up to the surface of the water.
11. A water injection device comprising:
a water tank configured to store water;
a conveying element connected to the water tank and configured to convey water;
at least one water injector connected to the conveying element and configured to inject water; and
a water quality and water level detection device configured to detect a quality of water in the water tank and a fill level of the water tank,
the water quality and water level detection device includes a float element and a sensor; and
the sensor is configured to determine a position of the float element.