Functions Used In Vehicle's Behavior Stabilization Control
| VDC function | The VDC determines the drivers intention from the data provided by the steering angle sensor, braking pressure sensor, engine-related sensors and other relevant sources and recognizes the result as the target vehicle behavior. At the same time, it determines the vehicles actual behavior from the data provided by the yaw-rate sensor, lateral G sensor, ABS sensor and other relevant sources. Then, the module compares the target and actual vehicle behaviors to estimate how the vehicle is running (whether it under-steers, oversteers, slips or is in other condition), and based on the result, performs braking control of individual wheels, engine output control and AWD control as necessary to correct the vehicle's running condition. |
| TCS function | The TCS constantly receives signals from the relevant sensors to monitor the vehicle speed. When the running wheels slip exceeding a certain limit, it performs braking control of individual wheels, engine output control and AWD control as required to maintain optimal traction and adequate side force. |
| ABS function | The ABS constantly receives signals from the relevant sensors to monitor the vehicle speed. When the slip of wheels during braking exceeds a certain limit, it performs braking control of individual wheels and AWD control as required to maintain optimal traction and adequate side force. |
- "Braking control" is effected by the VDCCM as follows:
The VDCCM calculates the required braking force for each wheel and sends signals to the VDC hydraulic unit. The hydraulic units motor pump is then operated to generate the required hydraulic pressure. Further, it controls the hydraulic units solenoid valves to increase, maintain or decrease the hydraulic pressure applied to the brake wheel cylinder as required.
When the brakes are applied by the driver, however, the braking force is controlled by the hydraulic pressure resulting from the driver's action.
- "Engine output control" is effected by the VDCCM as follows:
The VDCCM calculates the target engine output for each condition, and compares it with the current engine output. Based on the result of comparison, it determines the number of cylinders for which fuel injection is to be stopped and sends a command to the engine control module. The targeted engine output is then achieved.
- "AWD control" is effected by the VDCCM as follows:
When necessary, the VDCCM sends a command to the automatic transmission control module. According to the command, the transmission control module controls the transfer clutch so that the torque is distributed between the front and rear axles optimally.