192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1986-06-18
1987-08-11
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0092, 192 331, 192 362, 74733, B60K 4128
Patent
active
046855483
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a control system for a pressure operated clutch adapted to be engaged under speed synchronized conditions to smoothly transmit torque to a change speed gear unit.
Control systems of the foregoing type are known and used for most variable friction clutches, including dry and wet clutches in association with various vehicle gear transmissions. Often, a fluid torque converter having a by-pass clutch associated therewith is disposed between the engine and the speed synchronized clutch as disclosed for example in German Pat. No. 33 05 999. The use of such control systems enables manual gear shift control by inexperienced drivers under most difficult conditions to a qualitively acceptable degree in so far as road traction is concerned. However, such control systems do not as yet enable gear shift control by an inexperienced driver with satifactory quality in so far as torque reversing gear shifts are concerned.
It is therefore an object of the present invention to provide a control system for a pressure operated clutch associated with a reduction gear unit, wherein speed synchronization between clutch elements is achieved for good quality drive ratio change operation under driver control, including those drive ratio changes which involve a reversal of torque.
SUMMARY OF THE INVENTION
In accordance with the present invention, speed adjustment of the clutch elements of the gear shift transmission clutch engageable after each gear shift operation is completed, is effected with the assistance of the transmission driving engine in an automatic speed synchronizing operational mode.
As a result of engine idling and rotation of the output shaft of the gear unit at a high speed following torque reversing gear shifts, a relatively large speed differential between the input and output shafts of the gear unit occurs. Such differential speed condition is remedied by automatic engine acceleration of the drive train between the engine and the clutch by simply actuating the engine fuel control to thereby achieve a substantial improvement in the gear shift characteristic. Various factors affect such corrective action through the engine fuel control including for example the turbine of the torque converter disposed in the drive train between the engine and the clutch and the rotational speed of the input shaft of the gear unit. Such rotational speeds are compared through an electronic unit to generate a corrective fuel controlling signal command of a duration sufficient for an increasing turbine speed to exceed the speed of the input shaft to the gear unit by a correction factor.
In order to avoid any interruption in the corrective signal command, generation of such command is limited to a gear shift from neutral to a low drive ratio. Detection of such shift condition is effected electrically to simply signal the electronic unit.
The corrective signal command for fuel control actuation is applied advantageously through an automatic operating arrangement at the fuel injection pump or superimposed on the throttle control linkage so as not to interfere with manual driver control and avoid unnecessary duplication of parts already associated with the existing fuel control system for the engine.
Where fuel control actuation by the driver is effected through a fuel control system having a gas pedal mechanically connected to a control lever for the fuel injection pump, for example, then the superimposed automatic operating arrangement may advantageously involve use of a pressure medium in a piston-cylinder mechanism. If the control lever of the fuel injection pump is operated however by a so-called electronic gas pedal, then the corrective command issued from the electronic unit 5 may be directly superimposed on the electronic gas pedal of such fuel control system.
BRIEF DESCRIPTION OF DRAWING FIGURES
Further details of the invention will be explained on the basis of an embodiment shown by way of example in the accompanying drawings, in which:
FIG. 1 is a side elevation view of
REFERENCES:
patent: 3129795 (1964-04-01), Goeschel et al.
patent: 3645366 (1972-02-01), Numazawa et al.
patent: 3876028 (1975-04-01), Asano et al.
patent: 4344513 (1982-08-01), Etienne
patent: 4505368 (1985-03-01), Ackerman et al.
patent: 4601369 (1986-07-01), Hattori et al.
Patent Abstracts of Japan, Band 7, No. 141 (M-223) (1286) Jun. 21, 1983 & JP, A, 56150935 (Mitsubishi K.K.) 3/1983.
Bieber Gerold
Holtermann Otto
Torbusch Klaus
Krizmanich George H.
Zahnradfabrik Friedrichshafen AG
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