Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1990-03-30
1992-03-03
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
3644241, 74867, B60K 4106
Patent
active
050921991
ABSTRACT:
A hydraulic control apparatus for an automatic transmission has friction elements for performing a downshift by releasing one friction engaging element and engaging another. The apparatus includes duty control valves connected to the friction engaging elements, duty solenoid valves connected to oil lines for supplying pilot hydraulic pressure to the duty control valves, and control means. In a case where a release duty signal is outputted to one duty solenoid valve to control the pilot hydraulic pressure to thereby release the one friction engaging element, and downshift is a power-on downshift, the control means raises the duty ratio of the other duty solenoid valve to a predetermined valve to raise engaging hydraulic pressure supplied to the other friction element when rotational speed of the transmission input shaft is greater than a difference between the product of output shaft rotational speed and low-side gear ratio and a rotational speed commensurate with a delay in engine speed upturn.
REFERENCES:
patent: 4041809 (1977-08-01), Dick et al.
patent: 4370903 (1983-02-01), Stroh et al.
patent: 4527678 (1985-07-01), Pierce et al.
patent: 4667540 (1987-05-01), Yagi
patent: 4680988 (1987-07-01), Mori
patent: 4942530 (1990-07-01), Boda et al.
patent: 4953090 (1990-08-01), Narita
patent: 4955259 (1990-09-01), Narita
Goto Shigeki
Saitou Yoshitami
Aisin Seiki Kabushiki Kaisha
Herrmann Allan D.
Levi Benjamin
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