US 5,479,343 AGranted

Production planning system

AssigneeHitachi, Ltd.

InventorsHideaki Matoba, Mitsuhiro Enomoto, Masahiro Watanabe, Takahiro Tsukishima

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Abstract

In a production planning system, the explosion of a product to parts is performed by a specification check device and a design passage judgement device. An MRP calculation control device, a leadtime forecasting device, an MRP explosion calculation device, a work load calculation device and a data input/output device cooperate to estimate a shop load and to calculate a leadtime with a work load and a production capacity taken into consideration, thereby drawing up a production plan. A problem area analysis device analyzes a problematical area in the production plan to display it by graphics of the data input/output device. Various adjustment devices carry out the adjustment of the production plan through a graphic interface.

Claims29

Dependent claims

A production planning system comprising a data input/output device having a data input/output display and operation processing function, a leadtime forecasting device for forecasting a leadtime from a production capacity and a work load, a material requirement planning (MRP) explosion calculation device for performing an MRP calculation from the leadtime and from data for performing an MRP explosion calculation and outputting a result of the MRP calculation, a work load calculation device for calculating a work load from the result of the MRP calculation, an MRP calculation control device for controlling operation of said leadtime forecasting device, said MRP explosion calculation device and said work load calculation device, a problem area analysis device for analyzing and outputting a problematical area from an output of said MRP explosion calculation device in accordance with an instruction from said data input/output device, a production capacity adjustment device for changing a production capacity in accordance with an instruction from said data input/output device to make an output instruction to said MRP explosion calculation device, and a data retention device, whereby a possibility of execution of a production plan is judged by making a production schedule simulation through a calculation of a leadtime with a work load and a production capacity of each process being taken into consideration.

A production plan adjusting system comprising:

a problem area analysis device for analyzing the distribution of each of a capacity and a load at each shop in a production plan on the basis of given production plan data and constraint condition data and detecting, in the case where an overload state in which a load exceeds a capacity is generated, a problematical area of generation of the overload state to produce analysis data;
a constraint relaxation judgement device for judging whether or not a plan in an inexecutable state is adjustable within a range of constraint conditions including the upper and lower limits of a total working time in a plan period and the upper and lower limits of a daily working time;
an efficient constraint relaxation selection device for selecting, when the adjustment within the range of constraint conditions is determined as being impossible, the kind of relaxation of the constraint conditions for effecting the cancellation of said overload state;
a constraint relaxation adjustment formulation device for formulating a first adjustment method based on the relaxation of the constraint conditions;
an efficient in-constraint adjustment selection device for selecting, when the adjustment within the range of constraint conditions is determined as being possible, a second adjustment method for effecting the cancellation of said overload state within the range of constraint conditions;
an in-constraint adjustment formulation device for formulating said second adjustment method within the range of constraint conditions;
and
an adjustment formulation control device for controlling the sequence of operations of said problematical area analysis device, said constraint relaxation judgement device, said efficient constraint relaxation selection device and said efficient in-constraint adjustment selection device;
whereby there is provided a function by which in order to turn an inexecutable production plan into an executable production plan, the allotted state of each of a capacity and a load at each shop is analyzed to make the analysis of a problematical area, thereby judging the necessity of the relaxation of the constraint conditions, and a production plan adjusting method with the relaxation of the constraint conditions taken into consideration and a production plan adjusting method within the range of constraint conditions are respectively formulated in the case where the relaxation of the constraint conditions is determined as being necessary and in the case where the relaxation of the constraint conditions is determined as being unnecessary.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/059,227Filed 10 May 1993 · continuation in part
Priority: JP 2-32230528 Nov 1990
Granted: 26 Dec 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06Q 10/06
Administration; Management: resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation…
G05B 19/41865
Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible…:…
G06Q
Information and communication technology [ict] specially adapted for administrative, commercial, financial, managerial
G05B
Control or regulating systems in general