Electronic Air Suspension: Notes
The Electronic Air Suspension (EAS) is a versatile microprocessor controlled system that exploits advantages of air suspension. It provides a variable spring rate which achieves near constant ride frequency for all load conditions, providing:
- Improved Ride Quality
- Continuity Of Ride Quality, Laden Or Unladen
- Constant Ride Height
- Improved Headlight Levelling
The function of the EAS system is to provide five height modes, each of which is automatically maintained at given height by system logic with minimum of driver involvement. Vehicle height is sensed by four rotary potentiometer type height sensors. Vehicle height information from each potentiometer signals ECU to adjust each air spring by switching solenoid valves to hold, add or release air. The system provides five height settings and automatic self leveling as follows:
- Standard
783-797 mm, measured from center of wheel opening to ground. - Low Profile
20 mm below standard. - Access
60 mm below standard. - High Profile
40 mm above standard. - Extended Profile
20-30 mm above high profile.