Boots – shoes – and leggings
Patent
1991-01-18
1994-02-01
Black, Thomas G.
Boots, shoes, and leggings
74866, 192 52, 192 358, G06F 1550, F16D 1106
Patent
active
052837386
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process and an apparatus for control of a clutch.
BACKGROUND OF THE INVENTION
DE-OS 34 38 594 disclosed a control mechanism for a clutch in which the speeds of the engine and the input and output speeds of the transmission are detected and processed in an electronic clutch control for slip modulation of the clutch.
The slip control switch itself, which modulates the actuator for the clutch, takes place depending only on the input speed of the engine and the transmission. The output speed of the transmission, which is proportional to the velocity of the vehicle, is used only for determining the vehicle downtime or a sequence velocity.
However, in many transmission controls, especially in automatic transmissions for passenger cars, the transmission input speed is not directly known, since no adequate sensors are placed on the output shaft of the clutch or on the turbine shaft in the case of automatic transmissions with a hydrodynamic torque converter. But the output speed of the turbine or the clutch can obviously be calculated from the ever-present velocity of the vehicle which corresponds to the output speed of the transmission and from the equally known gear ratio in the transmission. But during a gear change, which lasts a certain period of time, the gear ratio is not defined so that the output speed of the clutch cannot be so simply calculated.
SUMMARY OF THE INVENTION
Therefore, the problem to be solved by the invention is to develop further a control mechanism for a clutch in a manner such that, even without knowing the clutch output speed, a gear change of good quality results without detracting from the comfort or without spinning the engine.
With the specification of certain parameters for the pressure modulation of the clutch, it is possible, for example, to lower the clutch pressure at the beginning of the gear change and keep it constant for the duration of the change. Thereby the slip is increased and the change made more comfortable. But it is also possible, for a further improvement, to load-dependently modulate the lowering of the load for the entire duration of the gear change. While these simple solutions work without a return signal of measured magnitudes, higher demands can be satisfied by determining the virtual clutch output speed, then using the speed, in combination with the ever-present engine speed, for slip control regulation during the gear change operation. With both fundamental possibilities, the slip of the clutch and therewith the quality of the gear change can be modulated.
During the idle time, which is always present during the introduction of a change of gear and remains present until the shifting elements act--loading time--, the slip should be kept constant. The improvement in the gear shift is thus accomplished by simple means. By a time-dependent or also load-dependent control of the pressure, it is possible at relatively low expense to improve further the adaptation to the consecutive adjusting operation in the new gear, and also possible to vary the load changes in accordance with the torque, the change of torque, or also the position of the throttle valve, for example.
The slip regulation, which is introduced during one gear, is effected with the values of the ever-present engine speed and of the clutch output speed calculated from the transmission output speed and the gear ratio, and it can be continued in the same fashion by determining the virtual clutch output speed for the period of time in which no gear is introduced. At the same time, the determination can be advantageously effected from the transmission output speed and virtual gear ratio which, in another embodiment, is calculated from the old and the new ratio according to a transition period function. For a further improvement in the change of a gear, it is possible to set the slip nominal value, which enters in the slip regulation when a gear is introduced, still higher. This can take place periodically for a further improvement depending also on the load. Another improvem
REFERENCES:
patent: 4428467 (1984-01-01), Hiramatsu
patent: 4577737 (1986-03-01), Nikura et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4662488 (1987-05-01), Hiramatsu et al.
patent: 4724939 (1988-02-01), Lockhart et al.
patent: 4783957 (1988-11-01), Harris
patent: 4947970 (1990-08-01), Miller et al.
patent: 5010990 (1991-04-01), Yoshimura et al.
patent: 5029087 (1991-07-01), Cowan et al.
patent: 5069319 (1991-12-01), Makabe
patent: 5176234 (1993-01-01), Reik et al.
Patent Abstracts of Japan, vol. 7, No. 1, M183, abstract from JP 57-160723, pub. Oct. 4, 1982 Aishin Seiki K.K.
Gruhle Wolf-Dieter
Runge Wolfgang
Schwab Manfred
Black Thomas G.
Louis-Jacques Jacques H.
Zahnradfabrik Friedrichshafen AG
LandOfFree
Process and device for controlling a clutch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for controlling a clutch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for controlling a clutch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-584253