System and method for determining vehicle component conditions
First Claim
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1. A method for determining vehicle component conditions, comprising:
- storing diagnostic functions that map one or more features of motor current measurements to different door conditions, wherein each door condition comprises a problem with operation of a vehicle door;
obtaining the motor current measurements for a door over a predetermined time period;
identifying at least one open and close cycle of the door during the predetermined time period comprising movement of the door from an open state to a closed state or a closed state to an open state;
selecting the motor current measurements occurring during the at least one open and close cycle;
calculating the features from the motor current measurements obtained during the at least one open and close cycle, comprising one of;
performing;
dividing the at least one open and close cycle into at least three different states, wherein each state is identified using a different predetermined rule based on one or more of motor current, door commands, and operating state;
identifying the motor current measurements for each state; and
calculating statistical measurements as the features for each state in the at least one open and close cycle; and
performing;
plotting the motor current measurements for the at least one open and close cycle on a graph;
fitting a mathematical function to the plotted motor current measurements for the at least one open and close cycle; and
identifying coefficients of the fitted mathematical function of the motor current measurements as the features;
analyzing the features of the motor current measurements by mapping the features to one or more door conditions via the stored diagnostic functions; and
identifying from the different door conditions at least one problem with the door based on the analyzed features that correspond with the door condition for that problem.
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Abstract
A system and method for determining vehicle component conditions are provided. A function that maps features to door conditions is stored. Motor current measurements are obtained for a door over a predetermined time period. The features of the motor current measurements are determined based on the stored function. The features are then analyzed by mapping the features to one or more door conditions via a predetermined function. At least one condition of the door is determined based on the analyzed features.
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Citations
5 Claims
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1. A method for determining vehicle component conditions, comprising:
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storing diagnostic functions that map one or more features of motor current measurements to different door conditions, wherein each door condition comprises a problem with operation of a vehicle door; obtaining the motor current measurements for a door over a predetermined time period; identifying at least one open and close cycle of the door during the predetermined time period comprising movement of the door from an open state to a closed state or a closed state to an open state; selecting the motor current measurements occurring during the at least one open and close cycle; calculating the features from the motor current measurements obtained during the at least one open and close cycle, comprising one of; performing; dividing the at least one open and close cycle into at least three different states, wherein each state is identified using a different predetermined rule based on one or more of motor current, door commands, and operating state; identifying the motor current measurements for each state; and calculating statistical measurements as the features for each state in the at least one open and close cycle; and performing; plotting the motor current measurements for the at least one open and close cycle on a graph; fitting a mathematical function to the plotted motor current measurements for the at least one open and close cycle; and identifying coefficients of the fitted mathematical function of the motor current measurements as the features; analyzing the features of the motor current measurements by mapping the features to one or more door conditions via the stored diagnostic functions; and identifying from the different door conditions at least one problem with the door based on the analyzed features that correspond with the door condition for that problem. - View Dependent Claims (2, 3, 4, 5)
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Specification