Interrelated power delivery controls – including engine control – Clutch control – Condition responsive control
Patent
1994-10-17
1997-10-07
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Clutch control
Condition responsive control
477 62, 477169, 477180, 192 33, B60K 4102, F16H 6114
Patent
active
056741553
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of regulating a torque transmitting system which is operatively connected with the output of a prime mover, such as an internal combustion engine, and is drivingly connected with an automatic transmission by an output shaft. The system comprises a hydrodynamic power transmission, a friction clutch in parallel with the power transmission, a measured value detecting system and a central computer unit. The application of force to the friction clutch, and hence the torque which is being transmitted by the friction clutch, is designed to be or is purposefully made variable in cooperation with the central computer unit.
The invention further relates to a lock-up clutch for the hydrodynamic power transmission in a torque transmitting system of the above-outlined character. The hydrodynamic power transmission comprises a pump wheel, a turbine wheel, a guide wheel and a power transmission cover which is centered relative to the rotational axis, which is non-rotatably connected with the pump wheel and which surrounds or confines the turbine wheel. An annular piston which is centered between the cover of the power transmission and the turbine wheel has a radially outer portion provided with a conical friction surface and a radially inner portion constituting a sealing hub mounted on a complementary sealing hub which is non-rotatably connected with the turbine wheel.
Methods of regulating torque transmitting systems which involve selective adjustment of a pressure differential between the plenum chambers of a friction clutch, which is disposed in parallel with and bridges a hydrodynamic torque transmission or converter, and wherein the selective adjustment determines the magnitude of torque which is transmitted by the friction clutch, are known in the art.
For example, published German patent application No. 31 30 871 describes a regulating method in connection with a torque transmitting system of the above outlined character. The method involves a measurement of the slippage or slip between the input and the output, a comparison with predetermined desired magnitudes of slippage, and a compensation for detected differences, if any. The compensation involves a change of the pressure differential between the fluids in the two chambers of the friction clutch. Thus, the method involves a regulating procedure based on a conventional regulation of slip.
U.S. Pat. No. 5,029,087 also discloses a regulating method in connection with a hydrodynamic torque transmission or hydrokinetic torque converter which is disposed in parallel with a friction clutch. The patent proposes to determine the slip at the clutch, to compare the thus determined slip with predetermined magnitudes of slip, and to vary the pressure differential between the two plenum chambers of the friction clutch in response to detection of deviations of slip from predetermined values. Thus, here again, one deals with a typical regulation of slip which involves a compensation for detected deviations from predetermined values of slip.
U.S. Pat. No. 4,577,737 discloses a method of influencing a torque transmitting system of the above-outlined character. The patent proposes to directly monitor the transmission of torque by a hydrodynamic power transmission or converter by resorting to a torque sensor, and the transmission of torque is selected depending upon the operating conditions of the prime mover. The engagement of the friction clutch which bridges the hydrodynamic power transmission is regulated in such a way that one ensures the transmission of the required torque.
Of course, if one resorts to the just-outlined torque regulating method, the torque which is being transmitted by the power transmission and the resulting slip can be monitored and influenced only after they develop. To this extent, this method also involves a regulating principle which is related to the regulation of slip, even though the patented method involves influencing the torque which is to be transmitted by the power transmission.
REFERENCES:
patent: 4577737 (1986-03-01), Niikura et al.
patent: 4580668 (1986-04-01), Pickard et al.
patent: 4725951 (1988-02-01), Niikura
patent: 4969545 (1990-11-01), Hayashi
patent: 5029087 (1991-07-01), Cowan et al.
patent: 5226513 (1993-07-01), Shibayama
Herzog Klaus
Otto Dieter
Pfund Thomas
Rink Anton
Estremsky Sherry Lynn
LuK Gebriebe-Systeme GmbH
Marmor Charles A.
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