Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-07-10
1991-01-08
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4118
Patent
active
049826220
ABSTRACT:
A pressure control device of an automatic transmission in which duty ratio of speed gear changing solenoid is controlled, when a shift is done from D, 2 or L range to P, R or N range and back again to D, 2 or L range, such that the duty ratio is maintained at 0% to ensure a sufficiently large apply flow rate and then increased followed by a progressive decrease towards 0%. The time over which the duty ratio is maintained at 0% is shortened in an amount which is determined in accordance with the time elapsed till the shift back to the D, 2 or L range, whereby an abrupt application of the engaging hydraulic pressure to a clutch is avoided to minimize a shock which is generated at the time of shifting. When a shift is done for the first time from N to D range after turning on of the ignition switch, the time over which the duty ratio is maintained at 0% is prolonged so as to increase the rate of supply of the hydraulic oil to oil passages and hydraulic pistons of clutches for operating rotational elements of the automatic transmission, so that sufficiently large quantity of oil is maintained at the time of the first shift from N to D range shortly after the start of the engine, thereby minimizing a shock.
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Iwase Mikio
Tomino Toshihiro
Yamamoto Masanari
Aisin Aw Co. Ltd.
Wright Dirk
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