US 12,441,176 B2
Hybrid electric vehicle
Kotaro Maeda, Nisshin (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 23, 2023, as Appl. No. 18/454,299.
Claims priority of application No. 2022-197312 (JP), filed on Dec. 9, 2022.
Prior Publication US 2024/0190237 A1, Jun. 13, 2024
Int. Cl. B60K 6/445 (2007.10); B60W 10/06 (2006.01); B60W 10/08 (2006.01); B60W 20/50 (2016.01)
CPC B60K 6/445 (2013.01) [B60W 10/06 (2013.01); B60W 10/08 (2013.01); B60W 20/50 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A hybrid electric vehicle comprising:
an engine;
a first motor;
a planetary gear in which three respective rotating elements are connected to the first motor, the engine, and a drive shaft connected to one of a front wheel and a rear wheel;
a second motor connected to the drive shaft;
a first inverter and a second inverter that drive the first motor and the second motor;
a power storage device;
a step-up converter that includes two switching elements of an upper arm and a lower arm, and a reactor, boosts power from the power storage device, and supplies the boosted power to the first inverter and the second inverter;
a third motor connected to another one of the front wheel and the rear wheel;
a third inverter that is connected to a power line between the power storage device and the step-up converter via a connection line and drives the third motor;
a disconnection device that allows the power storage device to be connected to and disconnected from the step-up converter and the third inverter; and
a control device that controls the engine, the first inverter, the second inverter, the third inverter, and the two switching elements of the step-up converter, wherein the control device
controls the engine, the first inverter, the second inverter, the third inverter, and a switching element of the upper arm of the step-up converter such that a limp home mode is executed when an abnormality in which a switching element of the lower arm of the step-up converter is short-circuited occurs and the disconnection device disconnects the power storage device from the step-up converter and the third inverter, the limp home mode being a mode in which the vehicle travels while the second motor consumes electric power generated by the first motor using power from the engine in a state in which the switching element of the upper arm of the step-up converter is turned off and three phases in the third inverter are turned on, and
stops the limp home mode when a temperature of the third motor exceeds an allowable temperature in a case in which the limp home mode is executed.