EA4-x NTC 0x0A5(0-5) WheelImbalanceRejection

Nexteer Confidential

NTC Overview
NTC 0x0A5.(0-5) Wheel Imbalance Rejection

Description:

• •This diagnostic logs a when computed wheel imbalance rejection command has any of the following features 

• • –Exceeds maximum threshold  

  • –DC trend in cancellation command 

  • –Frequency of cancellation is incorrect 

  • –Wheel Speed inputs are incorrect 

  • –Persistance of cancellation command  

Diagnostic Overview:

• •The system function is designed to produce an cancellation command at appropriate frequency, amplitude and phase. If any of the thresholds with respect to amplitude, frequency or phase are exceeded, a diagnostic flag is set 

• •The diagnostic flag shuts down the wheel imbalance cancellation output wither immediately or through controlled ramping depending upon the type of fault 

• •The diagnostic shall also attempt to recover from the fault. Throughout the entire recovery, the final cancellation output shall be zero.    

• •This fault is a recovarable fault and shall reset all the internal variables to start producing the cancellation output from scratch. 

Typical Fault Response:  

• •Response for this diagnostic is F3. 

• •This fault is recoverable once the values fall within an ignition cycle.
  
   

Probable Sources
(Most to Least Probable):

• •Improper wheel speeds information from serial communication 

• •Maximum magnitude due to very high wheel imbalance  

• •DC Trend in generated cancellation command