Automatic transmission and hydraulic control method therefor
AssigneesJATCO Ltd, Nissan Motor Co., Ltd.
InventorsKousuke Waku, Hideshi Wakayama, Masayuki Miyazono, Keichi Tatewaki, Seiichiro Takahashi, Yuzuru Tohta, Takashi Matsuda, Daisuke Matsumoto
Life of this patent
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Abstract
A transmission controller operates an electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during an idle stop, but operates the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is higher than the steady load, for a predetermined period when an engine stops rotating.
Claims17
An automatic transmission to be combined with an engine which performs an idle stop, comprising:
- a mechanical oil pump which is driven by power of the engine;
- an electrical oil pump;
- a starting frictional engagement element to which a hydraulic pressure produced in the mechanical oil pump or the electrical oil pump is supplied;
- and
- an idle stop associated hydraulic control unit which operates the electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during the idle stop, but operates the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is set at a load higher than the steady load, for a predetermined period when the engine stops rotating.
A hydraulic control method for an automatic transmission to be combined with an engine which performs an idle stop and including a mechanical oil pump which is driven by power of the engine, an electrical oil pump, and a starting frictional engagement element to which a hydraulic pressure produced in the mechanical oil pump or the electrical oil pump is supplied, comprising:
- operating the electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during the idle stop, but operating in a high-pressure mode, in which the operating load of the electrical oil pump is set at a load higher than the steady load, for a predetermined period when the engine stops rotating.
An automatic transmission to be combined with an engine which performs an idle stop, comprising:
- a mechanical oil pump which is driven by power of the engine;
- an electrical oil pump;
- a starting frictional engagement element to which a hydraulic pressure produced in the mechanical oil pump or the electrical oil pump is supplied;
- and
- idle stop associated hydraulic control means for operating the electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during the idle stop, but operating the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is set at a load higher than the steady load, for a predetermined period when the engine stops rotating.
Dependencies are inferred from the claim text.