Over-loading monitoring system for electric motor in automotive engine simulating apparatus
AssigneeMeidensha Corporation
InventorsKaoru Sano, Fumio Mizushina, Takashi Goto, Toshimitsu Maruki, Yukio Naganuma
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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.
Claims2
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.
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 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;
- and
- means responsive to said over-loading signal for indicating an over-loading condition of said electric motor.
Dependencies are inferred from the claim text.