Patents by Inventor Shitomi Yanagawa

Shitomi Yanagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electric vehicle drive control apparatus, electric vehicle drive control method, and program thereof
    Patent number: 6902018
    Abstract: An electric vehicle drive control apparatus has an electric machine; a battery; an inverter that is driven in accordance with a drive signal, and that receives DC current from the battery and produces phase currents, and that supplies the phase currents to the electric machine; a battery voltage detection device that detects the battery voltage; and an electric machine torque restriction processing device that determines whether the battery voltage is higher than a threshold value, and restricts the electric machine torque if the battery voltage is higher than the threshold value. If the battery voltage becomes higher than the threshold value, the electric machine torque is restricted. Therefore, increases in the load on the inverter can be prevented.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: June 7, 2005
    Assignee: Aisin AW
    Inventors: Hideki Hisada, Kazuo Aoki, Shitomi Yanagawa
  • Electric vehicle drive control apparatus, electric vehicle drive control method, and program thereof
    Publication number: 20030034187
    Abstract: An electric vehicle drive control apparatus has an electric machine; a battery; an inverter that is driven in accordance with a drive signal, and that receives DC current from the battery and produces phase currents, and that supplies the phase currents to the electric machine; a battery voltage detection device that detects the battery voltage; and an electric machine torque restriction processing device that determines whether the battery voltage is higher than a threshold value, and restricts the electric machine torque if the battery voltage is higher than the threshold value. If the battery voltage becomes higher than the threshold value, the electric machine torque is restricted. Therefore, increases in the load on the inverter can be prevented.
    Type: Application
    Filed: July 30, 2002
    Publication date: February 20, 2003
    Applicant: AISIN AW CO., LTD.
    Inventors: Hideki Hisada, Kazuo Aoki, Shitomi Yanagawa