Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1998-10-21
2000-08-01
Estremsky, Sherry L.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477154, 477155, F16H 6106
Patent
active
060959487
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a process for operating a vehicle transmission, particularly for control of an automatic vehicle transmission, and also a control or regulating system for conducting the process.
2. Description of Prior Art
Processes for operating or for control of automatic vehicle transmissions are already known from the following documents:
In automatic vehicle transmissions, it is known how to adjust the pressure of the operating medium, which serves for actuating the friction elements of the transmission, as a function of different operating parameters of the motor vehicle. In the process disclosed in DE 1,932,986 C, pressure is adjusted by means of an electronic control via pre-given pressure characteristics. An equilibration of parameter changes as a consequence of serial scatter or alternation effects cannot be achieved thereby. Friction values of discs, characteristics of pressure controllers or springs, as well as the momentum yielded by the engine, however, are continually subjected to this type of scatter, whereby, on the one hand, fluctuations in the quality of shifting have been produced, but on the other hand, high requirements are placed on tolerances of the parts applied or used. This has a very unfavorable effect on cost.
In the design disclosed in DE 3,205,767 C, closed control circuits were used. These, however, have the disadvantage that a regulated quantity calculating the necessary dynamics is required. Basically, stability problems are to be expected in the control system of engine transmissions due to the dead times present in the entire operating leg, and thus clear repetivie errors must be taken into the bargain before the control can be correctly engaged, and this is reflected in poor comfort during shifting.
A pressure controller for an automatic transmission control for vehicles is known from DE 3,025,054 A1, in which a desired shift time is applied for changing gears as a function of the load. The actually occurring shift time is measured and compared with the stored theoretical shift time. Fluctuations occur hereby, a correcting value is entered in a correcting register, which is added in a change of gear to pressure characteristics, which originally are stored in memory and serve for the purpose of controlling the pressure during the change in gear.
In the case of a process for the electronic control of an automatic vehicle transmission, as described in EP 0 176,750 B2, correcting values are calculated and applied as a function of the load and rpm, so that an exact adaptation to different load [and] rpm conditions can be produced. The theoretical and actual values for the characterizing quantities as well as the correction values formed are placed in load-rpm characteristic diagrams, whereby the actual values are formed by taking the mean of the individual values from several shift processes, so that the previous correction value is maintained until the averaging process is completed, and after conducting the correction, the actual values for the mean are referred to the theoretical values for modifying the correction value.
A process is described in EP 0 435,371 B1 for controlling the change in an automatic transmission of a vehicle from a torque transmission device operated by fluid pressure and transmitting reduced torque, which device is assigned to low speed conditions, up to a torque transmission device operated by fluid pressure and transmitting an increasing torque, which [device] is assigned to high speed conditions, if the engine choke is essentially closed. The outgoing torque transmission device is thus simultaneously or essentially simultaneously disengaged when the incoming torque transmission device is engaged. The transmission has an input, an output, and a turbine, which is coupled with the drive engine by means of the input. The process described in this publication thus comprises the following named steps. The filling trough is applied at the incoming torque transmission device for a [certain] f
REFERENCES:
patent: 4967385 (1990-10-01), Brekkestran et al.
patent: 5072390 (1991-12-01), Lentz et al.
patent: 5547437 (1996-08-01), Kamada et al.
Depping Herbert
Haberle Friedrich
Maier Wilfried
Rotter Erwin
Schonhaar Thomas
Estremsky Sherry L.
Playtex Products Inc.
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