Hydraulic shift controller for an automatic transmission having

Details Hydraulic shift controller for an automatic transmission having Hydraulic shift controller for an automatic transmission having

1986-04-22

1987-10-20

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74740, 74752C, B60K 4106

Patent

active

047005912

ABSTRACT:
A hydraulic controller for the hydraulic pressure in an automatic transmission for a vehicle, which includes at least a first transmission section capable of automatically shifting gears in association with at least vehicle speed and engine load, and a second transmission section capable of automatically shifting between the lower gear side and the higher gear side, and being arranged on a output side of the first transmission section, and the first transmission section and the second transmission section are simultaneously or alternately shifted, to thereby achieve multi-gear shifts, wherein the hydraulic pressure of a frictionally engaging device for shifting the second transmission section into the high gear side at the time of the shift is varied in accordance with output shaft torque of the first transmission section. With this arrangement, the high gear shift of the second transmission section can be carried out by optimal acting forces for the respective shifts, so that a balance between improvements in the durability of the frictionally engaging device and reduction of shift shocks can be satisfactorily maintained.

REFERENCES:
patent: 4043223 (1977-08-01), Ohnuma et al.
patent: 4098148 (1978-07-01), Wayman
patent: 4129051 (1978-12-01), Shindo et al.
patent: 4304153 (1981-12-01), Moroto et al.
patent: 4368650 (1983-01-01), Numazawa et al.
patent: 4388844 (1983-06-01), Arai et al.
patent: 4406181 (1983-09-01), Kubo et al.
patent: 4476747 (1984-10-01), Kawamoto

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