CPC H02J 9/061 (2013.01) [H02J 7/342 (2020.01); H02J 2207/10 (2020.01)] | 7 Claims |
1. A backup power supply system for a shift-by-wire system, the backup power supply system comprising:
a power storage unit configured to, when a mains power supply that supplies power to the shift-by-wire system goes out of order, supply power to the shift-by-wire system; and
a control unit configured to, when at least one of a first condition or a second condition is satisfied, output an instruction signal to the shift-by-wire system, the instruction signal instructing that a shift range of an automatic transmission be changed into a parking range,
the first condition requiring that duration for which output voltage of the mains power supply remains equal to or less than a first voltage threshold value be longer than a first duration,
the second condition requiring that duration for which the output voltage of the mains power supply remains equal to or less than a second voltage threshold value be longer than a second duration, the second voltage threshold value being smaller than the first voltage threshold value, the second duration being shorter than the first duration.
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