| 摘要 |
<p>A vehicular system (70) includes a controller (92) and an electric motor (94) in signal communication with the controller (92) for receiving current and rotating at speed; while the controller (92) includes a first function (18) responsive to a signal indicative of the speed of the electric motor (94), a filter (14) responsive to a signal indicative of the heat generation rate of the vehicular system (70), a second function (16) in signal communication with the first function (18) and the filter (14), and a limit calculation function (26, 126) in signal communication with the second function (16) for providing a motor current limit (10, 110, 210) responsive to the second function (16); wherein a method for controlling the vehicular system (70) includes receiving a signal indicative of the heat generation rate of the vehicular system (70), receiving a signal indicative of a speed of the electric motor (94), providing a scale factor or an overload value in response to the received signal indicative of speed, filtering the received signal indicative of heat generation rate in correspondence with a time constant, processing the filtered signal by executing a multiplication by the scale factor or a comparison with the overload value to produce a signal indicative of compliance with a duty cycle requirement, and calculating a motor current limit in correspondence with the processed signal to thereby protect the system from thermal overload while maximizing its performance.
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