Hydraulic pressure supply control apparatus for automobile
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKazuaki Nakamura, Toshimitsu Sato
Life of this patent
Estimating the term…
Abstract
In one embodiment, a hydraulic pressure control circuit (4) of an automatic transmission includes a mechanical oil pump (MOP) and an electrical oil pump (EOP). The discharge side of the electrical oil pump (EOP) is caused to be in communication with the direct upstream side of a hydraulic pressure servo of a first clutch (C1) via a shunt hydraulic pressure supply passage (430). At the time of idle reduction, a linear solenoid (411) on the upstream side of the first clutch (C1) is caused to enter a forced closure state, thus preventing oil from the electrical oil pump (EOP) from flowing to a manual shift valve (410) side.
Claims16
A hydraulic pressure supply control apparatus provided in an automobile that performs internal combustion engine automatic stop control in which driving of an internal combustion engine is stopped in a case in which a predetermined internal combustion engine automatic stop condition is established, the hydraulic pressure supply control apparatus comprising:
- a friction engaging unit including a startup friction engaging element;
- a hydraulic pressure control unit for hydraulic pressure adjustment that is connected to the friction engaging unit via a hydraulic pressure passage;
- a hydraulic pressure supply source that supplies hydraulic pressure for engaging the startup friction engaging element;
- a shunt hydraulic pressure supply passage that directly supplies hydraulic pressure from the hydraulic pressure supply source to the friction engaging unit without causing the hydraulic pressure to pass through the hydraulic pressure control unit;
- and
- a valve mechanism closing portion that, when executing the internal combustion engine automatic stop control, forcibly causes at least one of existing valve mechanisms respectively included in the friction engaging unit and the hydraulic pressure control unit to enter a closed state so as to suppress a flow of hydraulic oil from the hydraulic pressure supply source into the hydraulic pressure control unit via the friction engaging unit.
Dependencies are inferred from the claim text.