Control system for selectively switchable two/four wheel drive a

Details Control system for selectively switchable two/four wheel drive a Control system for selectively switchable two/four wheel drive a

1985-07-24

1987-07-14

Herrmann, Allan D.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74868, 74740, B60K 4104

Patent

active

046794506

ABSTRACT:
A transmission control system for an automatic transmission for a vehicle having a main transmission unit which provides a plurality of speed stages and an auxiliary transmission unit which is connected in series with the main transmission unit and provides two very different speed reduction ratios such as 1 and 3 such as desirable for a transmission selectively operative in a two wheel drive operational mode or in a four wheel drive operational mode, the auxiliary transmission being manually switched over between the two different speed reduction ratios, wherein there is provided a means for controlling the auxiliary transmission unit to override the manual control of the auxiliary transmission in a manner only to prevent switching over of the auxiliary transmission unit to the larger speed reduction ratio according to at least one parameter with regard to operational conditions of the vehicle and also according to which of the plurality of speed stages the main transmission unit is set.

REFERENCES:
patent: 3963085 (1976-06-01), Vinton
patent: 4324153 (1982-04-01), Sugimoto et al.
patent: 4411174 (1983-10-01), Yokoi et al.
patent: 4444073 (1984-04-01), Moroto et al.
patent: 4481877 (1984-11-01), Takano et al.
patent: 4503927 (1985-03-01), Hayakawa et al.
patent: 4552036 (1985-11-01), Takano et al.

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