Boots – shoes – and leggings
Patent
1995-10-17
1998-05-05
Nguyen, Tan Q.
Boots, shoes, and leggings
364424084, 364424086, 364424094, 477 43, 395905, B60K 4120, F16H 6102
Patent
active
057484724
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process for controlling an automatic transmission according to the preamble of the first claim.
In an automatic transmission, a shift is started when a shifting characteristic is exceeded. The shifting characteristics are, for instance, a function of vehicle speed and of a position of the throttle valve. The driver usually can choose by pressing a key from three shifting programs, for instance.
DE 39 22 051 A1 has disclosed a process for control of an automatic transmission. In said publication is described how actual vehicle parameters determine a first parameter, the driving activity. The actual vehicle parameters are: engine speed, a throttle valve position, diagonal acceleration, vehicle speed and derived therefrom a longitudinal acceleration or longitudinal deceleration. The driving activity is selected from one of five shifting programs. It is disadvantageous that certain driving states are not taken into account.
This invention is based on the problem of providing a shifting system which reacts variably to specific operating conditions.
The problem is solved, according to the invention, by the fact that the driving activity is formed from at least one of the following weighted values: selector lever activity, excess engine torque, curve radius and brake activity. In comparison to the prior art, it is advantageous that the value of diagonal acceleration is eliminated. A curve radius is used instead of the diagonal acceleration. The curve radius results from a difference of, such as four, wheel speeds or a steering angle and the vehicle speed. By including the curve downshifts in curves, which are critical to safety, are effectively prevented.
A high selector lever activity characterizes a driver who intentionally reacts manually to shifting points in order to obtain an improved acceleration behavior or utilize braking action of the engine. A high excess engine torque characterizes a touring type of driver. The excess engine torque results from the difference of engine torque and the torque needed to overcome the resistance forces. The braking activity describes the period of time in which a driver neither accelerates nor brakes. This period of time begins with the change from traction to coasting and terminates with actuation of the brake. A longer period of time distinguishes a driver with a settled mode of driving. A shorter period of time identifies a pleasure driver.
In the development of the invention it is suggested that the shift program, in addition, be selected according to a second parameter. Said second parameter is composed of the driving state--city traffic, mountain driving and trailering.
In city traffic the full power of the engine is not always required in powerful engines. City traffic, with its own parameter, offers the advantage that the consumption is optimized. This is obtained, for instance, by starting the vehicle in second gear. The creep inclination of an automatic transmission is also hereby reduced. An additional step for reducing consumption is disconnection of a cylinder.
In the processes hitherto known only increased tractional resistance is detected. An identification of great tractional resistance, in mountain driving and/or trailering, offers the advantage of it being possible to react thereto by different shifting programs. In mountain driving, the transmission shifts to the next higher gear ratio at high speeds of the vehicle. Swinging shifts are thereby prevented in the case of small load positions. A swinging shift occurs when, with a constant load position, the traction of the engine after an upshift is less than the sum of the tractional resistance forces. The vehicle no longer accelerates, and the speed of the vehicle diminishes. It diminishes until exceeding a shifting characteristic for a downshift. The transmission shifts to the next lower gear ratio. Since the traction in this gear ration is greater than the tractional resistance forces, the vehicle again accelerates. It accelerates until again exceeding the shifting characteristic
REFERENCES:
patent: 3684066 (1972-08-01), Kubo et al.
patent: 4584906 (1986-04-01), Nagaoka et al.
patent: 4630508 (1986-12-01), Klatt
patent: 4862854 (1989-09-01), Oda et al.
patent: 5035160 (1991-07-01), Morita
patent: 5157609 (1992-10-01), Stehle et al.
patent: 5182710 (1993-01-01), Tomisawa
patent: 5189621 (1993-02-01), Onari et al.
patent: 5474505 (1995-12-01), Seidel et al.
patent: 5510982 (1996-04-01), Ohnishi et al.
Atz Automobiltechnische Zeitschrift, Bd. 94, Nr. 9, Sep. 1992, Suttgart de Seiten 428-438 Welter et al `Die Adaptive Getriebesteuerung fur die automatikgetriebe der BMW Fahrzeuge mit Zwolfzylindermotor` siehe Seite 432, linke Spalte, Absatz 2.2--Seite 435, linke Spalte, Absatz 2.3.4; Abbildungen 3-5, 8-11.
Patent Abstracts of Japan vol. 13, No. 567 (M-908) 15. Dec. 1989 & JP, A, 01 238 748 (Mitsubishi Electric Corp) 22. Sep. 1989 siehe Zusammenfassung.
Escher Manfred
Gruhle Wolf Dieter
Jauch Friedemann
Reiter Friedrich
Wendel Peter
Nguyen Tan Q.
ZF Friedrichshafen AG
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