Patents by Inventor Tatsuya Sahashi

Tatsuya Sahashi 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).

  • Control apparatus for automatic transmission and control method thereof
    Patent number: 8538647
    Abstract: In an operation of controlling an automatic transmission, an engagement pressure for each hydraulic servo in a normal operation is determined so that none of friction engagement elements slips at each shift speed in the normal operation, and so that in case of a failure in which the friction engagement element that is supposed to be disengaged in the normal operation is engaged, one of the friction engagement elements slips, and thus one of the shift speeds is established. In the control operation, upon detection of a failure state in which a gear ratio after a shift operation is a gear ratio of a shift speed different from a shift speed to be established, the slipping friction engagement element is disengaged, and the shift speed that is different from the shift speed to be established is temporarily retained.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: September 17, 2013
    Assignee: Aisin AW Co., Ltd.
    Inventors: Tatsuya Sahashi, Shin-ichirou Murakami, Masaki Nishide, Tatsuya Oba
  • CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD THEREOF
    Publication number: 20120010794
    Abstract: In an operation of controlling an automatic transmission, an engagement pressure for each hydraulic servo in a normal operation is determined so that none of friction engagement elements slips at each shift speed in the normal operation, and so that in case of a failure in which the friction engagement element that is supposed to be disengaged in the normal operation is engaged, one of the friction engagement elements slips, and thus one of the shift speeds is established. In the control operation, upon detection of a failure state in which a gear ratio after a shift operation is a gear ratio of a shift speed different from a shift speed to be established, the slipping friction engagement element is disengaged, and the shift speed that is different from the shift speed to be established is temporarily retained.
    Type: Application
    Filed: August 27, 2010
    Publication date: January 12, 2012
    Applicant: AISIN AW CO., LTD.
    Inventors: Tatsuya Sahashi, Shin-ichirou Murakami, Masaki Nishide, Tatsuya Oba