System and method for controlling travel of hybrid electric vehicle in an emergency
First Claim
1. A method of controlling travel of a hybrid electric vehicle in an emergency, comprising:
- determining, by a controller, whether an abnormality has occurred in a low voltage Direct Current-to-Direct Current (DC-DC) converter;
in response to determining that an abnormality has occurred in the low voltage DC-DC converter, determining, by the controller, whether voltage of a low voltage battery has deviated from an operational voltage range of a braking device;
in response to determining that the voltage of the low voltage battery has deviated from the operational voltage range of the braking device, setting, by the controller, a restricted vehicle speed which takes into account mechanical braking power; and
setting a maximum torque used to restrict a torque of a driving motor based on the set restricted vehicle speed.
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Accused Products
Abstract
Disclosed herein is a method of controlling the travel of a hybrid electric vehicle in an emergency. It is determined whether an abnormality has occurred in a low voltage Direct Current-Direct Current (DC-DC) converter. When it is determined that an abnormality has occurred in the low voltage DC-DC converter, it is determined whether the voltage of a low voltage battery has deviated from the operational voltage range of a braking device. When the voltage of the low voltage battery has deviated from the operational voltage range of the braking device, a restricted vehicle speed is set to take into account mechanical braking power. A maximum torque used to restrict the torque of a driving motor is set based on the set restricted vehicle speed.
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Citations
8 Claims
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1. A method of controlling travel of a hybrid electric vehicle in an emergency, comprising:
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determining, by a controller, whether an abnormality has occurred in a low voltage Direct Current-to-Direct Current (DC-DC) converter; in response to determining that an abnormality has occurred in the low voltage DC-DC converter, determining, by the controller, whether voltage of a low voltage battery has deviated from an operational voltage range of a braking device; in response to determining that the voltage of the low voltage battery has deviated from the operational voltage range of the braking device, setting, by the controller, a restricted vehicle speed which takes into account mechanical braking power; and setting a maximum torque used to restrict a torque of a driving motor based on the set restricted vehicle speed. - View Dependent Claims (2, 3, 4, 5)
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6. A system for controlling travel of a hybrid electric vehicle in an emergency, comprising:
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a low voltage DC-DC converter configured to convert high voltage of a high voltage battery into low voltage, and supply the low voltage to a low voltage battery; a braking device configured to receive power from the low voltage battery and then apply a braking signal to a driving motor or supply mechanical braking power using braking force; and a vehicle controller configured to, when an abnormality has occurred in the low voltage DC-DC converter and voltage of the low voltage battery has deviated from an operational voltage range of the braking device, set a restricted vehicle speed which accounts for a mechanical braking power, and set a maximum torque of the driving motor. - View Dependent Claims (7, 8)
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Specification