Ratio change control in an automatic transmission with stepped r

Details Ratio change control in an automatic transmission with stepped r Ratio change control in an automatic transmission with stepped r

1984-05-02

1986-07-15

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74870, 74864, B60K 4108

Patent

active

045999171

ABSTRACT:
Automatic transmission with stepped ratios for vehicle, characterized in that it comprises a system inhibiting untimely changes to the higher ratio, which system is arranged so that, on the one hand it generates a negative acceleration curve (3) located mainly below the up shift (1) and down shift (2) curves and an increasing throttle opening curve (4) located slightly above the negative acceleration curve and, on the other hand, it only enables the shift up to the higher ratio if the value of the opening (.alpha.c) settles down, i.e. stops varying for a minimum time and if the corresponding configuration point in the plane of the vehicle speeds and throttle openings lies either between the up shift curve (1) and the negative acceleration curve (3) if the opening varies in the decreasing direction, or between the increasing opening curve (4) and the up shift curve (1) if the opening varies in the increasing direction.

REFERENCES:
patent: 3766048 (1973-12-01), Enomoto
patent: 4233862 (1980-11-01), Richard
patent: 4258591 (1981-03-01), Eckert et al.
patent: 4282780 (1981-08-01), Totani et al.
patent: 4319501 (1982-03-01), Sugimoto
patent: 4324153 (1982-04-01), Sugimoto et al.
patent: 4490790 (1984-12-01), Shinoda
patent: 4501171 (1985-02-01), Muller

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