| 摘要 |
A closed-loop PWM current control for force motor applications in which temperature induced impedance variations are compensated for without adversely affecting the transient response of the control. In generating the force motor PWM duty cycle, the control employs a digital integration of the sampled current error which, in addition to the usual pole, creates a zero which tracks and cancels the force motor pole. As a result, the undesired transient response characteristic associated with the interaction between the filter and force motor poles is avoided. The gain coefficients employed in the filter are chosen in relation to a measure of the force motor temperature so that the cancellation occurs throughout the range of expected temperature variation. Since the force motor is submersed in the transmission fluid, the temperature of the force motor is accurately represented by a measure of the fluid temperature.
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