Heliospectra Ab

Volvo Car Corporation

Greenfish Ab

Heliospectra Ab (Publ)

Torsten Wik

Tessa Pocock

Anna-Maria Carstensen

Anton Klintberg

Kirk Clendinning

Bjorn Fridholm

Louise Almquist

Hannes Kuusisto

John Skötte

Teresa Pocock

Bjorn Linden

Felix Steimle

Daniel Bānkestad

Marcus Hedegärd

Linnéa Ahlman

Johan Lindqvist

A method for controlling a light intensity in an enclosed cultivation space, the enclosed cultivation space having a light regulating system including an artificial light source for emitting artificial light, the method comprising, detecting a first fluorescence gain and a second fluorescence gain at different light intensity operating points. If the fluorescence gain is greater when the light intensity is greater, then the light intensity setpoint can be increased. Similarly, if the gain is greater when the intensity is lower, then the setpoint can be reduced. The invention is based on the understanding that it is beneficial for plant growth to provide light at a level which corresponds to a maximum ChlF-gain. The light level which corresponds to a maximum ChlF-gain provides a good trade-off between production rate and production efficiency.

Light intensity control in an enclosed cultivation space

A method for estimating a capacity of an electrical energy storage device with higher accuracy than what is provided in the prior art. The uncertainties in measured electrical current or voltage used in the estimation of the capacity of the electrical energy storage device are at least partly compensated for by using a bias compensated capacity estimator instead of the often-used prior art capacity estimator. The accuracy of the voltage and/or electric current sensor becomes of less importance which leads to that less complicated and less costly sensors may be used and to improve accuracy of the estimated energy storage capacity. The above advantages are obtained by providing a bias compensated capacity estimator that includes at least one bias term which is related to a deviation of an expected value of an original capacity estimator from a true capacity value.

Method and system for improving battery capacity estimations

The present invention relates to a method for determining a growth status of a plant comprising chlorophyll, the method comprising the steps of: illuminating the plant () with input light including a light intensity modulation component (); detecting light emitted from the plant; determining (S) an offset light intensity () surrounding the plant, the offset light intensity being a static component of the input light; determining (S) a phase and a gain between the input light and the detected light, determining (S) a growth status of the plant based on a predetermined relationship between input light and detected light, and on the phase and the gain. The invention also relates to a corresponding system and to a computer program product.

Method and system for growth status determination of a plant

The present invention relates to a method for controlling of a growth cycle for a plant being arranged in a controlled environment and subject to light emitted by at least one artificial lighting arrangement. The invention also relates to a corresponding system device and to a computer program product.

Method for controlling a growth cycle for growing plants using state oriented control

A method and a system are provided for determining a maximum charge current or a maximum discharge current of an energy storage cell of an energy storage device. The method includes providing a predetermined upper voltage limit or lower voltage limit, and providing a time horizon as a time difference from a present time to a future time. The method also include, with a repetition time period different from the time horizon, repeating measuring a present voltage level of the energy storage cell, calculating a voltage difference between the present voltage level and the upper voltage limit or the lower voltage limit, and determining the maximum charge current or maximum discharge current corresponding to the voltage difference and a model, such that the estimated voltage is within the voltage limits.

Power and current estimation for batteries

The present invention relates to a method for artificial illumination of a plant, wherein the illumination of the plant is controlled based on the amount of light being reflected from the plant. The invention also relates to a corresponding illumination system, use of the illumination system and a computer program product.

Spectrum optimization for artificial illumination

The present invention relates to an integrated closed loop system for aquaculture in at least one culturing tank and using continuous bioreactor technology for the biological treatment and removal of organic material, nitrogen and phosphorous, comprising: an integrated, partially or wholly closed loop system for waste water treatment, where the water contains nitrogen containing compounds and/or substances, comprising at least one production unit of such nitrogen containing compounds and/or substances and using continuous bioreactor technology for the biological treatment and removal of organic matter, nitrogen and phosphorous from the said water at continuous flow, comprising: a) at least one suspended carrier bioreactor for bacterial growth under anoxic conditions to cause anaerobic denitrification, with one or several compartments, preceding b) at least one suspended-carrier bioreactor for bacterial growth under oxic conditions to cause aerobic nitrification, c) the denitrification taking place after the production unit, and d) the nitrification taking place prior to the production unit in a by-pass mode as part of the continuous flow.

Growing community of inventors

Gothenburg, Sweden

Torsten Wik