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公开(公告)号：US20230011239A1
公开(公告)日：2023-01-12
申请号：US17756861
申请日：2020-10-13
Applicant: KYB Corporation
Inventor： Tsuyoshi HIRONAKA , Midori NAGASHIMA , Ken TSUKUI , Kazuya MUROTA
Abstract: A working fluid supply system is provided with: a first oil pump and a second oil pump driven by an engine; a switching valve configured to cause a discharge passage of the second oil pump to communicate with at least one of a supply passage and a first drain passage; and a controller configured to switch the switching valve. The controller is configured to switch the switching valve by spending a switching time that is set in accordance with a degree of pressure variation predicted to be caused in the supply passage when the switching valve is switched instantaneously.
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公开(公告)号：US20220389944A1
公开(公告)日：2022-12-08
申请号：US17755763
申请日：2020-10-13
Applicant: KYB Corporation
Inventor： Tsuyoshi HIRONAKA , Midori NAGASHIMA , Ken TSUKUI , Kazuya MUROTA
Abstract: A working-fluid supply system includes: a first pump and a second pump driven by an engine; a first switching valve capable of switching a supply target of the second pump to either one of the discharge side and the suction side of the first pump; a first switching control unit configured to perform a switching control of the first switching valve; and a first pressure control unit configured to perform a control such that pressure on the suction side of the first pump becomes a predetermined first pressure when the first switching valve is switched such that the supply target of the second pump becomes the suction side of the first pump.
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公开(公告)号：US20210341054A1
公开(公告)日：2021-11-04
申请号：US17285004
申请日：2019-10-21
Applicant: KYB Corporation
Inventor： Kazuya MUROTA
Abstract: A working fluid supply device is provided with: a first oil pump and a second oil pump driven by an engine; a third oil pump driven by an electric motor; a first unloading valve configured to shift the second oil pump to a no-load operation state; and a controller configured to control a supply state of working oil to an automatic transmission. The controller sets the supply state to a supply state selected from: a first supply state in which the working oil is supplied only from the first oil pump; a second supply state in which the working oil is supplied from the first oil pump and the third oil pump; a third supply state in which the working oil is supplied from the first oil pump and the second oil pump; and a fourth supply state in which the working oil is supplied from the first oil pump, the second oil pump, and the third oil pump.
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