Honda Motor Co., Ltd.

Tomohisa Kaneda

Kazuhiko Kitano

Osahide Miyamoto

Koichi Fushimi

Ryuichi Mori

Hideyuki Yamanaka

Toshihiko Takaishi

Mapped data of line pressure set to any of high pressure/low pressure regions on the basis of an engine load are stored in a storage section. A determining sectiondetermines, on the basis of temperature of the hydraulic oil detected by an ATF temperature sensor, whether the mapped data the low pressure region is shifted in an enlarged direction. A state determining sectiondetermines whether a throttle valve opening degree TH of the vehicle is totally closed or whether the line pressure is currently set to low line pressure. When the low pressure region is shifted in the enlarged direction and the throttle valve opening degree TH is totally closed or the line pressure is currently set to the low line pressure, a region changing section enlarges the low pressure region of the mapped data stored in the storage section.

Line pressure control device for automatic transmission

A hydraulic pressurizer system () comprises a drive source (an engineand a motor generator), which drives a hybrid vehicle (), a mechanical oil pump (), which is driven by the drive source, an electrical motor (), which is activated by a 12V battery (), an electrical oil pump (), which is driven by the electrical motor (), and a control unit (), which activates the electrical motor (). The pressurizer further comprises a ratio-change mechanism (), which is activated by hydraulic oil supplied by the mechanical oil pump () and by the electrical oil pump () to establish a speed change ratio, at which the rotational driving force of the drive source is transmitted to wheels () with a rotational speed change. For executing a control for stopping the drive source, the control unit () executes a cleaning operation, which operates the electrical oil pump () for a predetermined time before the stopping of the drive source.

Hydraulic pressurizer system

A hydraulic pressurizer system comprises a drive source, which drives a hybrid vehicle, a mechanical oil pump, which is driven by the drive source, an electrical motor, which is activated by a 12V battery, an electrical oil pump, which is driven by the electrical motor, and a control unit, which activates the electrical motor. The pressurizer further comprises a ratio-change mechanism, which is activated by hydraulic oil supplied by the mechanical oil pump and by the electrical oil pump to establish a speed change ratio, at which the rotational driving force of the drive source is transmitted to wheels with a rotational speed change. The control unit memorizes a characteristic value, which is specified from the temperature of the hydraulic oil and from the rotational speed of the electrical motor, and a threshold value for the rotational speed of the electrical motor, which threshold value corresponds to the characteristic value.

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Wako, Japan

Tomohisa Kaneda