| CPC B60W 20/13 (2016.01) [B60W 20/15 (2016.01); B60W 30/19 (2013.01); B60W 2510/10 (2013.01)] | 6 Claims |
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1. A hybrid vehicle, comprising:
an engine;
a first rotating electrical machine;
a second rotating electrical machine connected to a drive wheel via an output shaft;
a planetary gear set configured to mechanically couple the engine, the first rotating electrical machine, and the output shaft and transmit torque among the engine, the first rotating electrical machine, and the output shaft;
a battery;
a power converter configured to convert electric power among the battery, the first rotating electrical machine, and the second rotating electrical machine;
a relay electrically connected between the battery and the power converter;
an auxiliary load;
a DC-to-DC converter electrically connected between the relay and the auxiliary load;
an auxiliary battery configured to supply electric power to the auxiliary load;
a first controller configured to calculate allowable charging power of the battery and allowable discharging power of the battery and output calculation results; and
a second controller configured to control the engine and the power converter according to the allowable charging power and the allowable discharging power received from the first controller, the second controller having, as control modes, a normal mode in which the relay is closed and the battery and the power converter are electrically connected and a batteryless drive mode in which the relay is opened to cause the hybrid vehicle to move with the battery electrically disconnected from the power converter, and the second controller being configured to select the batteryless drive mode when at least one of magnitude of the allowable charging power and magnitude of the allowable discharging power become smaller than a first predetermined value, wherein
the second controller is configured to perform constant voltage control of the DC-to-DC converter during the normal mode, and
the second controller further has, as the control mode, a constant power mode in which the second controller performs constant power control of the DC-to-DC converter and is configured to select the constant power mode when at least one of the magnitude of the allowable charging power and the magnitude of the allowable discharging power becomes smaller than a second predetermined value that is equal to or larger than the first predetermined value.
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