Over-loading monitoring system for electric motor in automotive engine simulating apparatus
First Claim
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1. In an apparatus for testing an automotive power transmission:
- a power plant including an electric motor;
a torque meter connected to said power plant;
an automotive power transmission connected to said torque meter and having output shaft;
a dummy load connected to said output shaft of said automotive power transmission;
a revolution speed sensor so constructed and arranged as to monitor revolution speed of said electric motor and produce a revolution speed signal indicative of said monitoring revolution speed;
said torque meter being so constructed and arranged as to monitor an output torque indicative signal indicative of said monitored output torque;
a controller connected to said torque meter and said revolution speed sensor, said controller including means for performing a first step of giving said torque indicative signal a weight which is a function of said revolution speed indicative signal and storing the result as data, a second step of repeating said first step a predetermined number of times to provide a predetermined number of said stored data, a third step of deriving a running average of said predetermined number of stored data;
a fourth step of evaluating said running average in comparison with a predetermined criterion; and
a fifth step of outputting an overloading signal in response to a result of evaluating step; and
means responsive to said over-loading signal for indicating an over-loading condition of said electric motor.
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Abstract
An over-loading detection system periodically samples a motor operating parameter, e.g. a revolution speed and an output torque at a predetermined relatively short sampling period. Based on the sampled motor operating parameter, a ratio of the output torque and a predetermined over-load rating torque is derived and stored. Over-load detection is performed with respect to a plurality of sampled ratios of the output torque and the over-load rating torque by deriving a running average and comparing the derived running average value with a predetermined threshold.
21 Citations
2 Claims
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1. In an apparatus for testing an automotive power transmission:
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a power plant including an electric motor; a torque meter connected to said power plant; an automotive power transmission connected to said torque meter and having output shaft; a dummy load connected to said output shaft of said automotive power transmission; a revolution speed sensor so constructed and arranged as to monitor revolution speed of said electric motor and produce a revolution speed signal indicative of said monitoring revolution speed; said torque meter being so constructed and arranged as to monitor an output torque indicative signal indicative of said monitored output torque; a controller connected to said torque meter and said revolution speed sensor, said controller including means for performing a first step of giving said torque indicative signal a weight which is a function of said revolution speed indicative signal and storing the result as data, a second step of repeating said first step a predetermined number of times to provide a predetermined number of said stored data, a third step of deriving a running average of said predetermined number of stored data;
a fourth step of evaluating said running average in comparison with a predetermined criterion; and
a fifth step of outputting an overloading signal in response to a result of evaluating step; andmeans responsive to said over-loading signal for indicating an over-loading condition of said electric motor.
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2. In an apparatus for testing an automotive power transmission:
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a power plant including an electric motor; a torque meter connected to said power plant; an automotive power transmission connected to said torque meter and having an output shaft of said automotive power transmission; a revolution speed sensor so constructed and arranged as to monitor revolution speed of said electric motor and produce a revolution speed signal indicative of said monitored revolution speed; said torque meter being so constructed and arranged as to monitor an output torque indicative signal indicative of said monitored output torque; a controller connected to said torque meter and said revolution speed sensor, said controller including means for performing a first step of giving said torque indicative signal a weight which is a function of said revolution speed indicative signal and storing the result as data, a second step of repeating said first step a predetermined number of times to provide a predetermined number of said stored data, a third step of deriving a running average of said predetermined number of stored data;
a fourth step of calculating a predetermined value out of said running average;
a fifth step of comparing said predetermined value with a preset criterion; and
a sixth step of outputting an over-loading signal when said predetermined value is greater than said preset criterion; andmeans responsive to said over-loading signal for indicating an over-loading condition of said electric motor.
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Specification
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Current AssigneeKabushiki Kaisha Meidensha
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Original AssigneeKabushiki Kaisha Meidensha
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InventorsGoto, Takashi, Maruki, Toshimitsu, Mizushina, Fumio, Naganuma, Yukio, Sano, Kaoru
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Primary Examiner(s)MYRACLE, JERRY
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Application NumberUS07/624,962Time in Patent Office883 DaysField of Search73/116, 73/117.2, 73/117.3, 73/118.1US Class Current73/118.02CPC Class CodesG01M 13/025 Test-benches with rotationa...H02H 7/085 against excessive load H02H...
