Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1993-12-21
1996-05-07
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 43, 477 46, F16H 6102, B60K 4112, B60K 4128
Patent
active
055140467
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a method for controlling an electrohydraulically operated infinitely variable transmission of a driven motor vehicle.
Conventional methods for controlling infinitely variable motor vehicle transmissions adjust the ratio of the transmission via a characteristic control curve automatically at least as a function of the position of the throttle valve and the rotational speed of the engine. In this case, the characteristic control curve is designed according to the following criteria: It must permit an operation that is either as economical as possible or an operation that is as power-oriented as possible.
In this regard, it has become known from Japanese Patent Document JP-OS 59-217050 to control an infinitely variable transmission on the basis of characteristic diagrams which are selected corresponding to a driving situation. As a result, it is achieved that the driver's requirements with respect to a consumption--favorable driving and driving performances are taken into account.
However, the internal-combustion engines which, as a rule, are used for driving the motor vehicle do not permit both criteria to be met at the same time. Frequently, there can therefore only be a compromise between two extremes because a purely consumption-optimized characteristic control curve does not offer sufficient safety reserves in critical traffic situations, and the fuel consumption is too high in the case of a power-optimized characteristic control curve.
Another possibility is the manual change-over between consumption-optimized and power-optimized characteristic control curves. However, this case, the driver must first operate a change-over switch before the corresponding switching program is made available to him. Moreover, only two extreme alternatives are offered to the driver which, however, permit only either a consumption-oriented or a power-oriented vehicle handling.
From German Patent Documents DE-PS 33 41 652 and DE 39 22 051 A1, it has become known in this context to automate this manual change-over. For this purpose, at least one accelerator pedal or throttle valve signal which is proportional to the position of the accelerator pedal is scanned and stored. By means of the scanned value, signal values which were detected earlier and were stored are continuously updated and a driving activity is calculated which evaluates a driver's driving style or his actions with respect to the control of the motor vehicle which are the result of a traffic situation. This driving activity will then be used for selectively influencing limit values for shifting decisions or for the selection of characteristic shifting curves in such a manner that the transition from the consumption-optimized shifting program to the power-optimized shifting program takes place continuously or in steps.
By means of the described devices and methods, it is therefore possible to simulate the driver's driving style by detecting a quantity which is representative of this style. However, the methods which are used as the basis can be applied to infinitely variable transmissions only to a limited degree because the latter have substantially different requirements and possibilities with respect to the control. Thus, infinitely variable transmissions, for example, permit a larger spread of the transmission ratios and allow an operation of the internal-combustion engine in virtually any possible and useful operating point.
It is therefore an object of the invention to provide a method for controlling an infinitely variable motor vehicle transmission by means of which a motor vehicle equipped with this type of transmission can be operated as optimally as possible and which is automatically adjusted to a driving style of the driver or to his actions with respect to the control of the motor vehicle caused by the traffic situation.
The principal advantages of the invention are that a method is provided for controlling an infinitely variable motor vehicle transmission which, based on a c
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Froschke Uwe
Mollers Werner
Petersmann Joseph
Seidel Willi
Stehle Heinz
Bonck Rodney H.
Dr. Ing. h.c.F. Porsche AG
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