Hybrid vehicles

The hybrid vehicle uses gear upshifts and engine torque control to prevent inverter switching during battery disconnection, ensuring continuous operation and power supply to critical systems.

JP2026087184APending Publication Date: 2026-05-27TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Applications
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2024-11-15
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

In hybrid vehicles with an engine, automatic transmission, and a power-generating electric motor, maintaining a shut-down state for the inverter during battery disconnection is challenging, particularly when the electric motor's rotational speed necessitates square wave control to supply power to systems like air conditioning and low-voltage systems.

Method used

The hybrid vehicle employs a control device to control the automatic transmission to shift up a gear when the electric motor's rotational speed exceeds a predetermined speed and increase engine torque when power output is insufficient, preventing inverter switching to square wave control mode and ensuring continuous operation without the high-voltage battery.

Benefits of technology

This approach maintains inverter shutdown during battery disconnection, avoiding square wave control and ensuring power sufficiency by upshifting gears and increasing engine torque, thus maintaining vehicle functionality.

✦ Generated by Eureka AI based on patent content.

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Abstract

During standby operation when the battery is disconnected, the inverter that drives the electric motor will remain in a shut-down state. [Solution] During emergency driving, when the high-voltage battery is disconnected and the inverter driving the electric motor is shut down, if the rotational speed of the electric motor reaches a predetermined rotational speed or higher, the automatic transmission is controlled to shift up a gear, and if the torque output to the drive shaft is less than the target torque that should be output to the drive shaft, the engine is controlled to increase the torque output from the engine, thereby performing electric motor rotational speed control.
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Citation Information

Patent Citations

  • Control device of vehicle

    JP2014217112A