Sensor apparatus for detecting an overhang on the load of a carrier device

1. A sensor apparatus for detecting an overhanging load on a carrier device, comprising:

a sensor arrangement with at least one transmitter,

at least one receiver, and

an electronic unit for controlling the transmitter and receiver, the electronic unit configured to:

enable the at least one transmitter to emit a light barrier across a first region and across a second region, wherein the second region is separate from the first region,

enable the at least one receiver to detect the light barrier transmitted across each of the first region and the second region,

generate a first signal corresponding to an interruption of the light barrier in the first region,

generate a second signal corresponding to an interruption of the light barrier in the second region, wherein the first region corresponds to the carrier device and the second region corresponds to the load, and

compare the first and the second signals to ascertain whether the load is overhanging the carrier device.

2. The apparatus of claim 1 , wherein the electronic unit ascertains an overhanging condition by performing a logical linking operation, wherein the overhanging condition is detected if the first signal signifies the absence of the carrier device and the second signal signifies the presence of the load.

3. The apparatus of claim 1 , wherein the sensor arrangement comprises a light barrier arrangement with a number of light barriers, wherein a first light barrier is present within the first region and a second light barrier is present within the second region so that at least one light barrier in the first region is provided for detection of the carrier device and at least one light barrier in the second region is provided for detection of the load.

4. The apparatus of claim 3 , wherein the carrier device includes a deck layer for carrying the load, and at least one light barrier is arranged at a height of the deck layer.

5. The apparatus of claim 3 , wherein at least one light barrier provided in one of the first and second regions is positioned to extend obliquely with respect to a plane of the carrier device.

6. The apparatus of claim 1 , wherein a movement speed of the carrier device is known and an overhanging condition is determined by the electronic unit from a difference between a time that the first signal is generated and a time that the second signal is generated.

7. The apparatus of claim 1 , wherein the electronic unit first senses the second region and then senses the first region.

8. The apparatus of claim 1 , wherein the electronic unit generates the first and the second signals at least twice.

9. The apparatus of claim 1 , wherein the electronic unit generates the first and the second signals shifted in time in relation to one another.

10. The apparatus of claim 9 , wherein the first and the second signals are shifted in time depending upon whether an arriving front or departing front of the moving carrier device with the load is being detected.

11. The apparatus of claim 3 , wherein at least one light barrier for the first region is arranged geometrically offset in relation to at least one light barrier for the second region with respect to a direction of movement of the carrier device.

12. The apparatus as claimed in claim 1 , wherein the sensor arrangement comprises a 3D camera.

13. The apparatus of claim 1 , wherein the sensor arrangement operates on a time-of-flight principle, in which a distance covered by electromagnetic radiation emitted from the transmitter to the receiver via a reflection surface is determined by means of an evaluation of a phase of an oscillation modulated onto the electromagnetic radiation by comparison of the phase of the transmitted electromagnetic radiation with the phase of the received, reflected-back electromagnetic radiation.

14. The apparatus of claim 1 , wherein the sensor arrangement determines a distance covered by electromagnetic radiation emitted from the transmitter to the receiver via a reflection surface by means of an evaluation of the time difference between when the electromagnetic radiation is transmitted and when it is received.

15. A sensor system for detecting an overhanging load on a carrier device, comprising:

a 3-D camera with

at least one transmitter,

at least one receiver, and

an electronic unit for controlling the transmitter and receiver, wherein the electronic unit is configured to:

enable the at least one transmitter to emit electromagnetic radiation across a first region and across a second region, wherein the second region is separate from the first region,

enable the at least one receiver to detect the electromagnetic radiation transmitted across each of the first region and the second region,

generate a first signal corresponding to an interruption of the electromagnetic radiation in the first region,

generate a second signal corresponding to an interruption of the electromagnetic radiation in the second region, wherein the first region corresponds to the carrier device and the second region corresponds to the load,

independently sense the first region and the second region during movement of the carrier device, and

compare the first and the second signals to ascertain whether the load is overhanging the carrier device.

16. The sensor system of claim 15 , wherein the first and second regions are sensed simultaneously.

17. The sensor system of claim 15 , wherein the 3-D camera operates on a time-of-flight principle, in which a distance covered by the electromagnetic radiation emitted from the transmitter to the receiver via a reflection surface is determined by means of an evaluation of a phase of an oscillation modulated onto the electromagnetic radiation by comparison of the phase of the transmitted electromagnetic radiation with the phase of the received, reflected-back electromagnetic radiation.

18. A method for detecting an overhanging load on a carrier device with a sensor apparatus, comprising the steps of:

emitting an electromagnetic radiation from a transmitter across a first region and across a second region, wherein the second region is separate from the first region,

detecting the electromagnetic radiation transmitted across each of the first region and the second region with a receiver,

independently sensing the first region, defined by the carrier device, and the second region, defined by the load on the carrier device, with an electronic unit configured to control the transmitter and the receiver;

generating a first signal with the electronic unit corresponding to an interruption of the electromagnetic radiation in the first region, wherein the first signal has at least a first state, indicating the presence of the carrier, and a second state, indicating the absence of the carrier;

generating a second signal with the electronic unit corresponding to an interruption of the electromagnetic radiation in the second region, wherein the second signal has at least a first state, indicating the presence of the load, and a second state, indicating the absence of the load; and

comparing the first signal to the second signal with the electronic unit to ascertain whether the load is overhanging the carrier device.

19. The method of claim 18 wherein the step of comparing the first signal to the second signal with the electronic unit ascertains whether the load is overhanging the carrier device if the first signal indicates the absence of the carrier and the second signal indicates the presence of the load.

20. The method of claim 18 wherein:

the step of generating a first signal corresponding to the first region includes comparing the phase of the electromagnetic radiation emitted to the first region to the phase of the electromagnetic radiation received from the first region using a time-of-flight principle; and

the step of generating a second signal corresponding to the second region includes comparing the phase of the electromagnetic radiation emitted to the second region to the phase of the electromagnetic radiation received from the second region using a time-of-flight principle.