Method and an arrangement for controlling an automatic transmission

An arrangement for controlling an automatic transmission of a motor vehicle driven by means of an internal-combustion engine, comprising:

• a first generator that determines a position of a power control element of the internal-combustion engine;
• a second generator that determines a rotational engine speed of the internal-combustion engine and at least one characteristic shifting diagram for automatic determination of a ratio of a transmission connected behind the internal-combustion engine from the signals of the second generator;
• a third generator that determines a reaction of the vehicle to the position of the power control element;
• a first comparator coupled to the first and third generators and that relates the signal for the position of the power control element to the signal for the reaction of the vehicle thereto;
• a second comparator coupled to the first comparator that determines a deviation of the signal of the first comparator from a signal of the first comparator which exists during a normal drive on a level surface in a sense of an exceeding and a falling-below said signal existing during the normal drive;
• and
• a displacing device which acts upon the characteristic shifting diagram to displace the ratios as a function of the deviation so as to result in higher rotational engine speeds.

An arrangement for controlling an automatically shifting stepped transmission of a motor vehicle driven by an internal-combustion engine, comprising:

• a first generator that determines a position of a power control element of the internal-combustion engine;
• a second generator that determines rotational engine speed of the internal-combustion engine;
• a plurality of characteristic shifting diagrams which cover a range between a consumption-optimal and a power-optimal operation of the internal-combustion engine and by which, at least as a function of the position of the power control element and of the rotational engine speed, ratios are automatically selected, said plurality of characteristic shifting diagrams differing in the position of the characteristic shifting curves at which a change of the ratio takes place;
• means for determining the relationship of the position of the power control element to the reaction of the vehicle, said means including several characteristic diagrams of which one is used, in accordance with the adjusted ratio, for determination of an intermediate quantity as a function of a change of the vehicle speed and the position of the power control element;
• means for multiplying the intermediate quantity with a factor which is a function of the driving speed and which continuously reduces the value of the intermediate quantity as the driving speed increases;
• a first order delay line filter that filters said intermediate quantity;
• and
• means for selecting, for the displacement of the ratio, the characteristic shifting diagram to be used according to the filtered intermediate quantity, such that with an increasing intermediate quantity characteristic, shifting diagrams are selected which increasingly cover the power-optimal operation.

An arrangement for controlling an automatically shifting continuous transmission of a motor vehicle driven by an internal-combustion engine, comprising:

• a first generator for determining the position of a power control element of the internal-combustion engine;
• a second generator for determining the rotational engine speed of the internal-combustion engine;
• a plurality of characteristic shifting diagrams which cover a range between a consumption-optimal and a power-optimal operation of the internal-combustion engine and by which, at least as a function of the position of the power control element and of the rotational engine speed, ratios are automatically selected;
• means for determining a relationship of the position of the power control element to the reaction of the vehicle, said means including several characteristic diagrams of which one is used, in accordance with the adjusted ratio, for determination of an intermediate quantity as a function of a change of the vehicle speed and the position of the power control element;
• means for multiplying the intermediate quantity with a factor which is a function of the driving speed and which continuously reduces the value of the intermediate quantity as the driving speed increases,
• a first order delay line filter which filters said intermediate quantity;
• and
• means for selecting, for the displacement of the ratio, the characteristic control curve to be used according to the filtered intermediate quantity, such that with an increasing intermediate quantity characteristic control curves are selected which increasingly cover the power-optimal operation.