Method for determining a transmission ratio for an automatic transmission arranged in a drive train of a motor vehicle
AssigneeRobert Bosch GmbH
InventorsMarko Poljansek, Rasmus Frei
Life of this patent
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Abstract
The invention relates to a method for determining a transmission ratio for an automatic transmission arranged in the drive train of a motor vehicle. Operating parameters of the vehicle and especially of equipment arranged in the drive train are made available in a control apparatus to determine the transmission ratio. The invention provides that the transmission ratio (i) of the transmission is determined in dependence upon an instantaneous vehicle load.
Claims19
A method of determining a transmission ratio (i) for an automatic transmission mounted in the drive train of a motor vehicle, the method comprising the steps of:
- providing a control apparatus wherein operating parameters of the motor vehicle are made available to determine the transmission ratio (i);
- determining the transmission ratio (i) of said automatic transmission in dependence upon an instantaneous load of said motor vehicle with said instantaneous load of said motor vehicle being included in a characteristic line (KLDKI) for a throttle flap position (DKI);
- and,
- determining the characteristic line (KLDKI, KLDKI,c) in dependence upon an acceleration (a) of said motor vehicle with said acceleration (a) being an index for the instantaneous load of said motor vehicle.
A method of determining a transmission ratio (i) for an automatic transmission mounted as part of equipment in the drive train of a motor vehicle, the method comprising the steps of:
- providing a control apparatus wherein operating parameters of the motor vehicle are made available to determine the transmission ratio (i);
- making operating parameters of said equipment available in said control apparatus to determine said transmission ratio (i);
- determining the transmission ratio (i) of said automatic transmission in dependence upon an instantaneous load of said motor vehicle with said instantaneous load of said vehicle being included in a characteristic line (KLDKI) for a throttle flap position (DKI);
- and,
- determining a corrected characteristic line (KLDKI,c) for determining said transmission ratio (i) utilizing the computation rule:
- KL DKI , c = KL DKI · ( ( S + R ) · DKI max - S · DKI ) DKI max
- wherein:
- S is a spread;
- R is a residual factor;
- and,
- DKImax is a maximum throttle flap position.
Dependencies are inferred from the claim text.