| DTC Strategy |
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- Improper installation of wheel speed sensor
- Abnormal Rotor and wheel bearing
- Faulty Wheel speed sensor
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| Enable Conditions |
Case1 (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
- Controller counts the number of the wheel deceleration of - 100g [(-25 km/h) for 7ms]. When the numbers at each wheel exceed 56 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 140msec, controller recognize the failure
- In case that any sensor failure at other wheel was already detected, When the numbers of 100g at each wheel exceed 5 times, or When the numbers of 70g at each wheel exceed 20 times, controller 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.
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| Case2 (wrong exciter) |
- Max. wheel velocity exceeds 20 km/h and the wheel velocity is 40% of max. wheel velocity. if this condition is lasted for 2 minutes
- Max. wheel velocity exceeds 40 km/h and the wheel velocity is 60% of max. wheel velocity. if this condition is lasted for 2 minutes
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| Fail Safe |
- Only one wheel failure: Inhibit the ABS/ESC/DBC control, allow the EBD control. The ABS/ESC warning lamps are activated, the EBD warning lamp is not activated
- More than two wheels failure: The ABS/EBD/ESC/DBC functions are inhibited. The ABS/EBD/ESC warning lamps are activated
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