Control method and control device for an infinitely variable change-speed gear
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsEmanuel Fuchs, Bertrand Daieff
Life of this patent
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Abstract
An arrangement for controlling an infinitely variable vehicle transmission includes an adjusting element which is operable in two modes. In a first mode, the adjusting element can be actuated to select from predetermined transmission gear settings. In the second mode, it can be actuated to cause a continuous adjustment of the vehicle gear. The direction, speed and manner of such adjustment depend on the manner in which the adjusting element is actuated, and optionally vehicle operating parameters. In addition, the adjusting element can be used to select from among driving control modes based on predetermined algorithms, for achieving maximum economy or maximum performance.
Claims20
A control method for an infinitely variable change speed gear of a vehicle transmission driven by an internal-combustion engine, in which a control unit connected with a selector device carries out a control method in at least one operating mode, in which a speed-increasing ratio of the change speed gear is influenced directly by the vehicle operator by manual actuation of the selector device in one of two possible actuating directions, wherein:
- when the selector device is actuated in a first direction for a duration which is less than a given time period, the speed-increasing ratio is first adjusted toward a higher gear by a minimal adjustment that corresponds approximately to one gear jump in a step shifting transmission;
- during a continuous actuation of the selector device in the first direction, a continuous adjustment is carried out in the direction of a higher gear;
- when the selector device is actuated in a second direction for a duration which is less than the given time period, the speed-increasing ratio is first adjusted toward a lower gear by a minimal adjustment that corresponds approximately to one gear jump in a step shifting transmission;
- during a continuous actuation of the selector device in the second direction, a continuous adjustment is made in the direction of a lower gear.
A control device for an infinitely variable change speed gear of a vehicle transmission driven by an internal-combustion engine, comprising:
- a selector device which can be actuated in at least two directions;
- and
- a control unit connected with the selector device, and constructed such that, in a first operating mode, when the selector device is manually operated, the transmission of the change speed gear can be influenced directly;
- wherein,
- the control unit is constructed for:
- adjusting the speed-increasing ratio first by a minimum adjustment toward a higher gear when the selector device is actuated in a first direction for a duration which is less than a given time period;
- carrying out a continuous adjustment toward the higher gear during a continuous actuation of the selector device;
- adjusting the speed-increasing ratio first by a minimum adjustment toward a lower gear when the selector device is actuated in a second direction for a duration which is less than the given time period;
- and
- carrying out a continuous adjustment in the direction of a lower gear during a continuous actuation of the selector device in the second direction.
Dependencies are inferred from the claim text.