A control apparatus for controlling a regenerative operation of a vehicle motor
includes a vehicle motor as a drive source of a vehicle, an energy storage device,
including plural cells, for storing regenerative energy generated by a regenerative
operation of the vehicle motor, and a total voltage measuring device for measuring
a total voltage that is a sum of inter-terminal voltages of the plural cells, a
cell voltage judgment device for determining whether the inter-terminal voltage
of any one of the plural cells exceeds a predetermined regeneration limitation
voltage, a total voltage estimating device for determining, when it is determined
by the cell voltage judgment device that the inter-terminal voltage of any one
of the cells exceeds the predetermined regeneration limitation voltage, an estimated
total voltage which is defined as a total voltage at a time when the inter-terminal
voltage of the one of the cells reaches a regeneration prohibition voltage that
is higher than the predetermined regenerative operation limiting voltage, and a
control device for setting an amount of regeneration depending on a difference
between the estimated total voltage determined by the total voltage estimating
device and the total voltage measured by the total voltage measuring device.