| DTC Strategy |
|
- Improper installation of wheel speed sensor
- Abnormal Rotor and wheel bearing
- Faulty Wheel speed sensor
- Wrong type of wheel speed sensor
|
| Enable Conditions |
Case 1 (Speed jump) |
- Controller counts the number of the wheel acceleration of 100g[ (25 km/h) for 7ms]. When the numbers at one wheel exceed 56 times, or When the numbers at more two wheels exceed 5 times, controller recognize the failure
- Controller counts the number of the wheel acceleration of 70g[ (17.5 km/h) for 7ms]. When the numbers at one wheel exceed 126 times, or When the numbers at more two wheels exceed 20 times, controller recognize the failure
- The wheel deceleration of -100g[ (-25 km/h) for 7ms] causes the controller to start monitoring this failure and to compare the wheel velocity with the vehicle velocity from next cycle. When its difference of -100g is continued for more than 140 msec, controller recognize the failure
- Controller counts the occurrence number of the wheel acceleration of ±28g.[ (7 km/h) for 1ms] If the number exceeds 60 at one wheel, ECU recognize the failure
- The counter of speed jump is cleared every 30min.
- This monitoring is performed for the period that the velocity of each wheel exceeds 2 km/h. (1.2 mph)
|
| Case 2 (wrong exciter, Missing Teeth) |
- In case that three wheel speeds are above 15 km/h (9.3 mph) and in specific range and another wheel speed is out of specific range longer than 20 second
- In case that two wheel speeds are above 15 km/h (9.3 mph) and in specific range and other wheel speed (s) is (are) out of specific range longer than 60 seconds
- In case that min Wheel Speed is less than 40% of Max Wheel Speed which is over than 20 km/h and less than 40 km/h for more than 2min.
|
| Case 3 (Wheel Sensor type Mis-installation) |
- A failure is detected if the signal is detected as a smart wheel sensor signal 200 times consecutively on the wheel that is set as active wheel sensor
- A failure is detected if the signal is detected as an invalid signal (is not smart wheel sensor signal) 200 times consecutively on the wheel that is set as smart wheel sensor
- The failure is detected when wheel speed is 5~60 km/h
|
| Fail Safe |
- Only one wheel failure: Inhibit the ABS/ESP (ESC)/DBC/AVH control, allow the EBD control. The ABS/ESP (ESC)/DBC/AVH warning lamps are activated, the EBD warning lamp is not activated
- More than two wheels failure: The ABS/EBD/ESP (ESC)/DBC/AVH functions are inhibited. The ABS/EBD/ESP (ESC)/DBC/AVH warning lamps are activated
|