| 摘要 |
PROBLEM TO BE SOLVED: To suppress current/voltage variations caused by driving a solenoid and further easily restrain noise generation caused by driving the solenoid. SOLUTION: There is provided a transmission controller 1 equipped with a control means which drives a plurality of the solenoids 2 for transmission control using a plurality of switching elements 6 subjected to on-off control governed by a PWM signal output from a microcomputer 5 and performs over excitation control and chopping control during an on-state of the solenoid. The control means supplies PWM signals 7a, 7b, 7c to each of the switching elements 6 for driving the solenoid 2 with the phases of the PWM signals 7a, 7b, 7c equally displaced by 360°/N resulting from dividing 360°by N, the number of driving circuits of the solenoids and besides performs control of drive so that frequencies for driving the solenoids approximates to an upper limit of audio frequency or exceeds the upper limit. COPYRIGHT: (C)2008,JPO&INPIT
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