State Estimation of a Reefer Container


Virksomhed / Organisation


Syd- og Sønderjylland

Intercontinental transport of goods has risen over the past 20 years, and with an increased demand for ripe bananas and other exotic fruits, the need for refrigeration containers are growing rapidly. Lodam Electronics A/S develop control units for such containers, and spend a great deal of time in making these as efficient as possible, as increased environmental concerns, force the end-customers to take precautions as to how large the emissions of such containers can be.
Over the past years, little effort has been put into the development of error handling, state estimation etc., as the main scope have been on developing a MIMO control system, and improving the fault detection using simple methods. This simple fault detection system provides only rough state estimates and in order to improve control and cargo safety, better estimates are required.

Project description
The purpose of this project is to develop a state estimator for a refrigeration container. The choice of estimator is up to the project group, but as a minimum it should be able to fuse five (or more) measurements, and be able to still produce an estimate, even though three sensors fail.
Our recommendation is that the project group works with developing a Kalman Filter (possibly, Extended/Unscented Kalman Filter), to produce these estimates. The advantage of the latter, is that a model of the system (accurate to within ± 0.25%) already exists, and is available for rapid prototyping. We are however, open to suggestions.
Lodam electronics a/s will provide lab facilities (consisting of two real refrigeration containers) for testing purposes of the algorithm. We deem it important, that you come to Sønderborg to see the facilities.

Further information
Please contact Kresten K. Sørensen either by e-mail: or by phone: +45 73 42 37 37.

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