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# WHEEL MISALIGNMENT DIAGNOSTICS USING IN-VEHICLE SIGNAL

IP.com Disclosure Number: IPCOM000248274D
Publication Date: 2016-Nov-14
Document File: 2 page(s) / 323K

## Publishing Venue

The IP.com Prior Art Database

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WHEEL MISALIGNMENT DIAGNOSTICS USING IN-VEHICLE SIGNAL

Given a vehicle with the wheel alignment problem, while driving on a straight path, the steering wheel will not be centered around zero, which would result in significant tire wear, so detecting misalignment in early stages is of interests.

Depending on the extent of the problem, the steering wheel will be centered around an angle but not center, call it constant offset (as shown in Figure 1). A method is proposed to use the absolute angle of the steering wheel and investigates whether a constant offset exists in the system.

Method:

The following figure shows the block diagram of the misalignment diagnostic method. The two boxes are the innovation described in this disclosure.

Figure 2: Method's Block Diagram

The method that measures the existence of angle offset is a function of frequency and is a real number between 0 and 1 at each frequency (call the number a score). The smaller the score for a particular frequency, the less likely that frequency exists in the signal. On the other hand, the higher the score for a particular frequency, the more likely that frequency exists in the signal. By comparing the score with a threshold or/and by comparing the score with the distribution of the scores for each of the categories, i.e., proper vs. not proper alignments, the misalignment can be detected.

Specifically, the method measures the existence of zero-frequency in the steering wheel angle. Shown in is the model...