Methods and systems for assessing vehicle transmissions

A method for assessing a vehicle transmission having a resolver and a motor, the method comprising the steps of:

• running the motor at an approximately constant speed for a predetermined amount of time;
• measuring preliminary data while the motor is running, the preliminary data pertaining to a wobble error of the resolver;
• performing a Fourier transform of the preliminary data pertaining to the wobble error, generating transformed data;
• normalizing the preliminary data, generating normalized data;
• and
• assessing the vehicle transmission using the transformed data generated via the Fourier transform, wherein the step of assessing the vehicle transmission comprises assessing whether the vehicle transmission is acceptable using the normalized data.

A system for assessing a vehicle transmission having a resolver, the system comprising:

• a memory configured to store preliminary data pertaining to an error of the resolver, the memory further configured to store a predetermined value;
• and
• a processor coupled to the memory and configured to:
• determine a harmonic characteristic of the error, comprising:
• determining an upper peak value for the error from the preliminary data;
• determining a lower peak value for the error from the preliminary data;
• and
• assess the vehicle transmission using the harmonic characteristic of the error, comprising:
• determining that the vehicle transmission is acceptable if a difference between the upper peak and the lower peak values for the error is less than the predetermined value;
• and
• determining that the vehicle transmission is unacceptable if a difference between the upper peak and the lower peak values for the error is not less than the predetermined value.