System for and method of working out production start plans
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHarumichi Wakiyama
Life of this patent
Estimating the term…
Abstract
An ideal production start plan is worked out from the time interval required from a production start till a shipment and a delivery term. In addition, a satisfaction degree which represents a degree of permission of a deviation from an ideal production start time instant, is obtained. When it is impossible to start production of a plurality of different product items at a time in an ideal plan, a preferential product item is determined by referring to the satisfaction degree. In this way, an actual plan is worked out from the ideal plan. The actual plan which is obtained in this way is capable of execution and close to the ideal plan.
Claims23
A computerized system for working out production start plans comprising:
- accepted order memory means for storing accepted order specifications defining a quantity and a delivery term of each ordered product item;
- production condition memory means for storing production conditions defining a time interval required from a production start until a shipment of each product item;
- ideal production start time calculating means for calculating an ideal production start time from the accepted order specifications and the production conditions;
- satisfaction degree memory means for storing a satisfaction degree corresponding to a deviation from the ideal production start time of each ordered product item relative to an actual production start time;
- actual production start time calculating means for calculating an actual production start time from the ideal production start time and the satisfaction degree;
- and
- production plan generating means for generating a production start plan based on the actual production start time.
A method of working out production start plans by a computer, comprising the steps of:
- making a preliminary retrieval of a production condition representing a time interval from a production start until a shipment of each product item and of a satisfaction degree corresponding to a deviation from an ideal production start time of each product item relative to an actual production start time;
- calculating the ideal production start time of each product item from accepted order specifications and the production condition;
- calculating an actual production start time by tracing back part of the ideal production start time and giving preference to product items with lower satisfaction degrees, when the calculated ideal production start time surpasses the production start capacity;
- and
- generating a production start plan based on the actual production start time of each product item;
- wherein the step of calculating the ideal production start time and the step of calculating the actual production start time are executed when the order specifications indicative of a quantity and a delivery term of each product item are accepted.
A computerized system for determining production start times for ordered product items, comprising:
- means for converting accepted order information into digital accepted order signals, the accepted order information embodying a quantity and delivery term of the ordered product items;
- means for converting production condition data into digital production condition signals, the production condition data embodying a time interval between starting production of the ordered product items and shipment of the ordered product items;
- means for storing the digital accepted order signals, the digital production condition signals, calculated ideal production start time data and satisfaction degree data;
- means for calculating the ideal production start time data based upon the digital accepted order signals and the digital production condition signals;
- and
- means for calculating actual production start time data based upon the calculated ideal production start time data and the satisfaction degree data, the satisfaction degree data corresponding to a deviation from the ideal production start time relative to an actual production start time for each ordered product item.
A method for controlling production in an automated manufacturing plant, comprising:
- inputting into a computer processor accepted order data embodying a quantity and delivery term of ordered product items and production condition data embodying a time interval between starting production of the ordered product items and shipment of the ordered product items;
- using the computer processor to calculate ideal production start time data based upon the accepted order data and the production condition data;
- using the computer processor to calculate actual production start time data based upon the calculated ideal production start time data and satisfaction degree data, the satisfaction degree data corresponding to a deviation from the ideal production start time relative to an actual production start time for each ordered product item;
- and
- starting production of each ordered product item in accordance with the actual start time data.
A computer-readable recording medium that stores a control program for controlling production of ordered product items, comprising:
- instructions for calculating ideal production start time data based upon accepted order information embodying a quantity and delivery term of ordered product items and production condition data embodying a time interval between starting production of the ordered product items and shipment of the ordered product items;
- instructions for calculating actual production start time data based upon the calculated ideal production start time data and satisfaction degree data, the satisfaction degree data corresponding to a deviation from the ideal production start time relative to an actual production start time for each ordered product item;
- and
- instructions for adjusting actual production start times of ordered product items based upon the calculated actual production start time data.
Dependencies are inferred from the claim text.