Delivery unit for a liquid additive with a temperature sensor, method for checking the operating state of a delivery unit and motor vehicle having a delivery unit
View Patent ↗A delivery unit for delivering a liquid additive in a motor vehicle, includes at least one temperature sensor for contactlessly measuring a temperature at least at one measurement point in the delivery unit. The temperature sensor and the measurement point have a spacing therebetween and a radiation channel which is free from fixtures is provided between the temperature sensor and the measurement point. A method for checking the operating state of a delivery unit and a motor vehicle having a delivery unit are also provided.
1. A delivery unit for delivering a liquid additive in a motor vehicle, the delivery unit comprising:
at least one measurement point in the delivery unit;
at least one temperature sensor configured to contactlessly measure a temperature at said at least one measurement point;
said at least one temperature sensor and said at least one measurement point being separated from each other by a spacing;
a pump configured to deliver the additive, said pump having an outer surface on which said at least one measurement point is disposed; and
a radiation channel disposed between said at least one temperature sensor and said at least one measurement point and being free of fixtures.
2. The delivery unit according to claim 1 , wherein said at least one temperature sensor is an infra-red sensor.
3. The delivery unit according to claim 1 , wherein said spacing between said at least one measurement point and said at least one temperature sensor is at least 2 cm [centimeters].
4. The delivery unit according to claim 1 , which further comprises:
a sensor support;
said at least one measurement point including different measurement points in the delivery unit; and
said at least one temperature sensor including a plurality of temperature sensors disposed in common on said sensor support and configured to measure temperatures at said different measurement points.
5. The delivery unit according to claim 1 , wherein:
said at least one measurement point includes different measurement points spaced apart from one another in the delivery unit;
said at least one temperature sensor is one temperature sensor; and
radiation channels being free of fixtures are each disposed between said one temperature sensor and a respective one of said different measurement points permitting temperatures at said different measurement points to be monitored by said one temperature sensor.
6. The delivery unit according to claim 1 , which further comprises at least one heater configured to heat additive present in the delivery unit.
7. The delivery unit according to claim 1 , which further comprises a panel for fastening electronic components, said at least one temperature sensor being fastened to said panel.
8. A motor vehicle, comprising:
an internal combustion engine;
an exhaust-gas treatment device configured to purify exhaust gases of said internal combustion engine; and
a delivery unit according to claim 1 configured to deliver a liquid additive into said exhaust-gas treatment device.
9. A delivery unit for delivering a liquid additive in a motor vehicle, the delivery unit comprising:
a delivery unit housing having a pump disposed therein;
at least one measurement point in the delivery unit housing;
at least one temperature sensor configured to contactlessly measure a temperature at said at least one measurement point;
said at least one temperature sensor and said at least one measurement point being separated from each other by a spacing; and
a radiation channel disposed between said at least one temperature sensor and said at least one measurement point and being free of fixtures.
10. The delivery unit according to claim 9 , which further comprises at least one heater configured to heat additive present in the delivery unit, said at least one heater being disposed inside said housing.