Fuzzy logic method and system for adjustment of priority rating of work in process in a production line
First Claim
1. A method of operating a manufacturing control system for computer control of work flow in an automatic manufacturing production line with a plurality of work stations at which the progress of work is monitored, by the steps comprising,assigning priority ratings (PR) to each lot of WIP materials with said priority ratings (PR) ranging from a low priority rating to a high priority rating,making fuzzy logic tests of parameters of lots of WIP materials and making adjustments based upon said tests as follows:
- a) measuring the velocity of work flow parameter and adjusting PR rating as a function of said velocity,b) testing whether a lot exceeds a maximum time and increasing the PR rating if the lot exceeds said maximum time,c) batching when higher priority lots are absent, then upgrading the priority rating (PR) of said lot, andd) testing whether a Kanban is below target and if so, then upgrading the PR rating.
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Abstract
In a manufacturing control system for computer control of work flow in an automatic manufacturing production line with a plurality of work stations at which the progress of work is monitored, priority ratings are assigned to each lot of WIP materials with the priority ratings ranging from low to high. The priority rating of a lot increases as a function of increasing queue time, and as a function of the difference comprising the expected date out minus commitment date. The priority rating is reset to a default value after the lot is run. The passage of WIP materials is clocked to measure depletion and accumulation of material at a work station with increases in priority rating as a function of the difference of target velocity minus actual velocity of work with an increase of one priority rating level as the cumulative value of the difference exceeds a predetermined percentage.
112 Citations
33 Claims
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1. A method of operating a manufacturing control system for computer control of work flow in an automatic manufacturing production line with a plurality of work stations at which the progress of work is monitored, by the steps comprising,
assigning priority ratings (PR) to each lot of WIP materials with said priority ratings (PR) ranging from a low priority rating to a high priority rating, making fuzzy logic tests of parameters of lots of WIP materials and making adjustments based upon said tests as follows: -
a) measuring the velocity of work flow parameter and adjusting PR rating as a function of said velocity, b) testing whether a lot exceeds a maximum time and increasing the PR rating if the lot exceeds said maximum time, c) batching when higher priority lots are absent, then upgrading the priority rating (PR) of said lot, and d) testing whether a Kanban is below target and if so, then upgrading the PR rating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A manufacturing control system providing computer control of work flow in an automatic manufacturing production line with a plurality of work stations at which the progress of work is monitored, by the means comprising:
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means for assigning priority ratings to each lot of WIP materials with said priority ratings ranging from a low priority rating to a high priority rating, means for providing an increase in the priority rating of a lot as a function of increasing queue time, means for providing an increase in the priority rating of a lot as a function of the difference expected date out minus commitment date, and means for resetting to a default priority rating, after the lot is run. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification