Electric vehicles

The electric vehicle uses a drive and heat transfer system to manage motor power loss, stabilizing torque and reducing noise and vibration, ensuring comfortable operation and efficient heating without compromising vehicle comfort.

JP7868531B2Active Publication Date: 2026-06-02TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2023-02-24
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing electric vehicles face comfort issues due to increased vibrations and operating sounds from the motor when power loss increases, particularly at low speeds or when stopped, compromising the vehicle's interior comfort.

Method used

The electric vehicle incorporates a drive unit, control unit, and heat transfer unit to manage power loss in the AC motor, utilizing heat generated by the motor to heat objects while minimizing comfort compromise by controlling the d-axis current and current advance angle to maintain torque stability and reduce noise and vibration.

Benefits of technology

Effectively heats the vehicle's components using motor heat without compromising interior comfort by stabilizing torque and reducing noise and vibration, especially at low speeds or when stopped, while allowing high-speed travel with minimal comfort impact.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To heat a heating target by utilizing heat from a motor while suppressing a situation where comfort in a vehicle cabin is impaired.SOLUTION: A vehicle 1 includes: a motor M and an inverter 20, an ECU 100, and a circulation circuit 55. The circulation circuit 55 transfers heat generated due to power loss in the motor M and the inverter 20 to a power storage device B. When a predetermined heat request condition for requesting an increase in the heat transferred to the power storage device B is satisfied, the ECU 100 executes loss increase control to control the motor M and the inverter 20 so that the power loss increases as compared to when the heat request condition is not satisfied. When an index value related to a rotation speed of the motor M is less than a first threshold, the loss increase control includes first control to make a d-axis current of the motor M larger than a reference d-axis current which is the d-axis current when the heat request condition is not satisfied.SELECTED DRAWING: Figure 1
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