Load fill sensor system for grain storage vessels
A system for remotely indicating the level of grain being loaded into a grain trailer. Plural vertically oriented sensing strips are affixed to a trailer's hopper(s) sidewall of the trailer's hopper(s) at spaced locations. Signals from transducer elements on the strips are delivered to an electronics module on the trailer's forward wall. The electronics module includes a multiplexer for sampling the state of the strip transducers and a wireless transmitter for relaying the state data to a receiver and microprocessor in the cab of a towing vehicle. The microprocessor presents a visual display of height reached by the grain in a hopper as loading continues. Following system calibration where a pixel count of the load being displayed and a measured net weight of the load are determined using a scale, a calibration factor corresponding to the weight-per-pixel is stored for use in computing the weight and volume of subsequent loads.
1. A method of determining the weight of a load of grain being loaded into a transport trailer comprising the steps of:
(a) providing a plurality of elongated sensing strips, each having a plurality of regularly, longitudinally spaced transducers thereon;
(b) affixing said sensing strips vertically to a wall of the transport trailer at laterally spaced locations;
(c) providing an electronic module including a multiplexer connected to the transducers on the plurality of sensing strips and a wireless transmitter for transmitting transducer state data to a remote location;
(d) providing at the remote location a computer having a wireless receiver and a graphics display panel;
(e) presenting on the graphics display panel an image of the level of grain in the transport trailer based on the transducer state data;
(f) counting the number of pixels in said image;
(g) obtaining a calibration factor by weighing gross and tare weights of the transport trailer to obtain a net load weight and dividing the net load weight by the pixel count to obtain a weight-per-pixel value; and
(h) thereafter using the calibration factor and a pixel count for subsequent trailer loads to determine the weight of the subsequent loads.
2. The method of claim 1 and further including the step of computing the volume of the subsequent trailer loads by dividing the weight of the subsequent loads by a known weight-per-bushel of the grain involved.
3. The method of claim 1 and further including the step of maintaining a running log of the amount of grain transported from a field during predetermined time periods in the computer.