Method for suppressing vibrations in the drive train of a motor
First Claim
1. A method for suppressing vibration in the drive train of a motor vehicle, which comprises:
- detecting an rpm of a vehicle engine;
deriving an rpm gradient from the rpm and evaluating the rpm gradient;
reducing torque of the engine by varying an ignition angle if impermissible vibration is detected; and
controlling the torque reduction as a function of an upper and a lower limit value for the rpm gradient by;
retarding the ignition angle if the rpm gradient drops below the lower limit value;
switching back to an initial performance graph if the rpm gradient exceeds the upper limit value;
predetermining the upper and the lower limit values as a function of the engine rpm; and
resetting the ignition angle to an original value after a predetermined maximum time has been exceeded, even if the upper limit value has not been exceeded by the rpm gradient.
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Accused Products
Abstract
A method for suppressing vibration in the drive train of a motor vehicle includes detecting an rpm of a vehicle engine; deriving an rpm gradient from the rpm and evaluating the rpm gradient; and reducing torque of the engine by varying an ignition angle if impermissible vibration is detected, wherein the torque reduction is controlled as a function of an upper and a lower limit value for the rpm gradient. The ignition angle is retarded if the rpm gradient drops below the lower limit value; switching back to an initial performance graph takes place if the rpm gradient exceeds the upper limit value; and the upper and the lower limit values are predetermined as a function of the engine rpm.
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Citations
8 Claims
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1. A method for suppressing vibration in the drive train of a motor vehicle, which comprises:
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detecting an rpm of a vehicle engine; deriving an rpm gradient from the rpm and evaluating the rpm gradient; reducing torque of the engine by varying an ignition angle if impermissible vibration is detected; and controlling the torque reduction as a function of an upper and a lower limit value for the rpm gradient by; retarding the ignition angle if the rpm gradient drops below the lower limit value; switching back to an initial performance graph if the rpm gradient exceeds the upper limit value; predetermining the upper and the lower limit values as a function of the engine rpm; and resetting the ignition angle to an original value after a predetermined maximum time has been exceeded, even if the upper limit value has not been exceeded by the rpm gradient. - View Dependent Claims (5)
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2. A method for suppressing vibration in the drive train of a motor vehicle, which comprises:
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detecting an rpm of a vehicle engine;
deriving an rpm gradient from the rpm and evaluating the rpm gradient;reducing torque of the engine by varying an ignition angle if impermissible vibration is detected; and controlling the torque reduction as a function of an upper and a lower limit value for the rpm gradient by; retarding the ignition angle if the rpm gradient drops below the lower limit value; switching back to an initial performance graph if the rpm gradient exceeds the upper limit value; predetermining the upper and the lower limit values as a function of the engine rpm; and setting a minimum ignition angle below which the ignition angle is not retarded in the retarding step.
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3. A method for suppressing vibration in the drive train of a motor vehicle, which comprises:
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detecting an rpm of a vehicle engine; deriving an rpm gradient from the rpm and evaluating the rpm gradient; reducing torque of the engine by varying an ignition angle if impermissible vibration is detected; and controlling the torque reduction as a function of an upper and a lower limit value for the rpm gradient by; retarding the ignition angle if the rpm gradient drops below the lower limit value; switching back to an initial performance graph if the rpm gradient exceeds the upper limit value; predetermining the upper and the lower limit values as a function of the engine rpm; and limiting a speed of change with which the ignition angle is adjusted.
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4. A method for suppressing vibration in the drive train of a motor vehicle, which comprises:
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detecting an rpm of a vehicle engine; deriving an rpm gradient from the rpm and evaluating the rpm gradient; reducing torque of the engine by varying an ignition angle if impermissible vibration is detected; and controlling the torque reduction as a function of an upper and a lower limit value for the rpm gradient by; retarding the ignition angle if the rpm gradient drops below the lower limit value; switching back to an initial performance graph if the rpm gradient exceeds the upper limit value; predetermining the upper and the lower limit values as a function of the engine rpm; and setting the lower limit value to higher values and setting the upper limit value to lower values at higher rpm, than at lower rpm. - View Dependent Claims (6, 7, 8)
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Specification