Sub-transmission control system for providing engine braking

Details Sub-transmission control system for providing engine braking Sub-transmission control system for providing engine braking

Filed on

1979-08-29

Date issued

1981-08-11

Examiner

Krizmanich, George H.

Patent Class

192 clutches and power-stop control

SubClass

Vortex-flow drive and clutch

SubSubClass

With brake

Other Related Categories

192 0094, 192 352, 74740, B60K 4120, F16H 3700

Type

Patent

Status

active

Patent number

042829577

Description

ABSTRACT:
In a vehicle equipped with a main transmission and, in series with it, a sub-transmission which has two speed stages, wherein the sub-transmission is automatically controlled by a main control system of a sub-transmission control system according to various operating parameters of the vehicle and the engine of the vehicle, it is proposed further to provide a sub-control system which is fed with a signal which indicates operation of the braking system of the vehicle, and which generates, when the braking system of the vehicle has been operating for longer than a first predetermined time, a shiftdown signal, which is fed to the main control system so as to override it, and so as to shift the sub-transmission positively into its lower speed stage, so as to provide good engine braking. It is further proposed to so arrange the sub-control system that, when the braking system of the vehicle is in operation, and then is put out of operation for a time which is shorter than a second predetermined time, the shiftdown signal is continuously produced without interruption.

REFERENCES:
patent: 2872000 (1959-02-01), Herndon et al.
patent: 3477313 (1969-11-01), Ringe
patent: 3523597 (1970-08-01), Lemieux
patent: 3684066 (1972-08-01), Kubo et al.
patent: 4039061 (1977-08-01), Pruvot et al.
patent: 4142613 (1979-03-01), Iijima
patent: 4181204 (1980-01-01), Ito

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