Vehicle driveline balancing
First Claim
1. A method of balancing a driveshaft assembled into an automotive vehicle having a transmission coupled to an engine and the driveshaft, extending between the transmission and a drive axle, having drive wheels mounted thereon, comprising the steps of:
- (a) determining a frequency response function at a first end and a frequency response function at a second end of the driveshaft;
(b) determining the critical value of frequency response and lag angle for each of the frequency response functions and their corresponding critical frequencies;
(c) determining a first critical speed for the drive wheels of the vehicle corresponding to the first end of the driveshaft;
(d) rotating the drive wheels at the first critical speed;
(e) measuring vibrational acceleration and acceleration phase angle corresponding to the vibrational acceleration at the first end of the driveshaft;
(f) calculating a value of imbalance for the first end; and
(g) calculating an amount of mass to add to the first end of the driveshaft to correct the imbalance and the mass phase angle at which to place the mass.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and system for balancing an automotive vehicle driveline (10) after it has been installed into a vehicle (8). An impact hammer and a system analyzer (36) are used to determine a frequency response function at each end of a driveshaft (16). From this, a critical frequency of rotation is determined for the driveshaft (16) for that particular model of vehicle (8) and driveline (10). Each vehicle (8) that comes off of an assembly line can now have a balance test performed on it using accelerometers (44 and 46) and a phase angle measurement. Combining the measurement with the frequency response function, the imbalance of the driveline is determined and compared to a predetermined limit to determine if correction masses need to be added. If so, a determination of the amount of mass needed and the orientation is made.
24 Citations
15 Claims
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1. A method of balancing a driveshaft assembled into an automotive vehicle having a transmission coupled to an engine and the driveshaft, extending between the transmission and a drive axle, having drive wheels mounted thereon, comprising the steps of:
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(a) determining a frequency response function at a first end and a frequency response function at a second end of the driveshaft; (b) determining the critical value of frequency response and lag angle for each of the frequency response functions and their corresponding critical frequencies; (c) determining a first critical speed for the drive wheels of the vehicle corresponding to the first end of the driveshaft; (d) rotating the drive wheels at the first critical speed; (e) measuring vibrational acceleration and acceleration phase angle corresponding to the vibrational acceleration at the first end of the driveshaft; (f) calculating a value of imbalance for the first end; and (g) calculating an amount of mass to add to the first end of the driveshaft to correct the imbalance and the mass phase angle at which to place the mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An automotive vehicle driveline balancing system for balancing a driveshaft having at least one piece that is assembled into an automotive vehicle having a transmission coupled to an engine and the driveshaft, extending between the transmission and a drive axle, having drive wheels mounted thereon, the system comprising:
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means for determining a frequency response function at a first end and a frequency response function at a second end of the driveshaft; means for determining the critical value of frequency response and lag angle for each of the frequency response functions and their corresponding critical frequencies; means for determining a first critical speed for the drive wheels of the vehicle for the first end of the driveshaft; means for rotating the drive wheels at the first critical speed; means for measuring vibrational acceleration and acceleration phase angle corresponding to the vibrational acceleration at the first end of the driveshaft; means for calculating a value of imbalance for the first end; and means for calculating an amount of mass to add to the first end of the driveshaft to correct the imbalance and a mass phase angle at which to place the mass. - View Dependent Claims (14, 15)
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Specification