Complete system
The Dynamic Drive controls the two active stabilizer bars according to the lateral acceleration levels detected. By so doing, it reduces body roll when cornering and on uneven road surfaces.
The Dynamic Drive control module calculates from the input signals the commands that need to be sent to the hydraulic motors.
The input signals are also checked for plausibility and used for system monitoring purposes.
- Pressure in the front-axle circuit
- Pressure in the rear-axle circuit
- Position of direction valve
- Lateral acceleration
- Level of oil reservoir
The most important control variable is the lateral acceleration. The following PT-CAN signals are also analyzed:
- Lateral acceleration
- Yaw angle speed
- Road speed
- Steering wheel angle
This additional information improves the system's response time.
The control module has short circuit-proof outputs for:
- Pressure control valves for front and rear axle
- Directional control valve
- Safety valve
- 5 Volts power supply of the 4 sensors (lateral acceleration, pressure sensors, front/rear axle circuit and switch position sensor)
The valves are activated via current control (pulse-width modulated signal). Signals are sent across the PT-CAN to the engine DME/DDE indicating whether additional power is required. This is the only way the power requirement can be covered, for example when idling during the commissioning procedure.
Dynamic Drive is not active with the vehicle stationary. All valves are without current. In other words, when the vehicle is stationary, the active anti-roll bars do not generate any torque. If the vehicle is leaning to one side when parked (e.g. with two wheels on the curb or unevenly loaded), the system does not perform any adjustments despite the fact that there is a measurable lateral acceleration. The Dynamic Drive comes into action at speeds upwards of approx. 15 km/h.