Honda Motor Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Takahide Watanabe

Naoyuki Kubo

Keiichiro Nakamura

Masahiko Mizuguchi

Masazumi Yamamoto

Hiroki Sanuki

The disclosure reduces the number of factors to be considered in the switching control of the shift stages, thereby simplifying the switching control. In a control device of an automatic transmission, when a detection part detects that a shift position has been switched from one of a forward range and a reverse range to the other, among multiple hydraulic friction engagement mechanisms, a hydraulic pressure command value is fixed for the hydraulic friction engagement mechanisms that do not change the engaged state between the forward range and the reverse range, and the hydraulic pressure command value is variable based on a hydraulic pressure supplied to the hydraulic friction engagement mechanisms for the hydraulic friction engagement mechanisms that change the engaged state between the forward range and the reverse range.

Control device of automatic transmission

An apparatus of an automatic transmission includes a control unit controlling engagement and release of engaging mechanisms. One of the engaging mechanisms is a mechanical engaging mechanism which can be switched to a first state and a second state in which rotation of a rotational element in both directions is restricted. In a reverse range, the mechanical engaging mechanism is set in the second state. If a shift range is switched to the reverse range when the mechanical engaging mechanism is in the first state, the control unit starts engagement corresponding to the reverse range after executing preparation processing. If the shift range is switched from the reverse range to a forward range in the preparation processing, the control unit establishes a forward gear range by controlling the engaging mechanisms according to a degree of progress of the preparation processing.

Control apparatus

An automatic transmission includes hydraulic friction engaging mechanisms for establishing a plurality of gears, at least one control valve for controlling oil pressures of hydraulic oils supplied to the engaging mechanisms, an oil pressure detection unit for detecting the oil pressure of the hydraulic oil supplied by the control valve, a learning unit for learning a correction value of an instructed oil pressure to the control valve such that an engaging time becomes a target engaging time, and a determination unit which determines, based on a difference between the instructed oil pressure to the valve and an oil pressure detection result obtained by the detection unit from the hydraulic oil supplied by the valve in correspondence with the instructed oil pressure, whether to exclude a control result by the instructed oil pressure from a learning target of the learning unit.

Automatic transmission

A spool valve includes a valve housing and a spool. The valve housing includes a spool hole, a first oil passage, and a second oil passage. The first oil passage has a first port, a second port and a third port that are open to the spool hole. The second oil passage has a fourth port, a fifth port and a sixth port that are open to the spool hole. The spool includes a first oil groove, a second oil groove, a third oil groove, a fourth oil groove, a first communication passage, and a second communication passage. The spool is slidable in the spool hole to switch communication of the third oil groove with the second port and the third port and to switch communication of the fourth oil groove with the fifth port and the sixth port.

Spool valve

A gas insulated electrical apparatus in which electric devices for three phases are housed within a common gas-filled vessel includes a first and a second curved wall spaced apart from each other by a first distance and a third and a fourth curved wall connected between the first and second curved walls and spaced apart from each other by a second distance smaller than the first distance to define a substantially oval cross-sectional shape. The electric devices are arranged in a row extending between the first and second walls. The first and second curved walls may have a first radius of curvature and the third and fourth curved walls may have a second radius of curvature larger than the first radius of curvature.

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Wako, Japan

Takahide Watanabe