ADS Damper Valve

Y51 and Y52 Damper Valve






Y53 Damper Valve






Y54 Damper Valve


NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

TASK
Adapt damping force to road surface

LOCATION
Between spring strut and spring actuator

DESIGN OF DAMPER VALVE





The damper valve (Y51, Y52, Y53, Y54) consists of the housing (a) and the 2-piston/reed valve packages (by The spring-loaded (c) solenoid valve pistons and the solenoids in the upper section of the housing are located above these. The valve pistons and solenoids form the solenoid valve units (y1, y2)

If the solenoid valve coils (y1, y2) are not actuated, the spring loaded solenoid valve pistons (y1, y2) keep the bores under them closed. The oil is displaced via the reed valve package (b) and the transverse oil gallery in the housing (a)

If, for example, a solenoid valve coil (y1) is actuated, the solenoid valve piston (y1) leaves the bore open and the oil can flow over it. The oil is only slightly throttled via the piston/reed valve package (b)

The damping force steps are achieved by means of the different arrangements of reed valve packages and the actuation of the solenoid valves.

FUNCTION OF DAMPER VALVE





Four damping force stages can be achieved via the actuation of the adaptive damping system (ADS) control module.

Damping Force Stage 1
For a soft ride with small body movements and slight longitudinal and lateral acceleration. In damping force stage 1 both solenoid valves y1 and y2 are opened, which means the highest proportion of oil can bypass the reed valves. The soft tension and pressure stage are achieved as a result.

Damping Force Stage 2
This is achieved by the reed valves in the valve piston. If the body moves downwards, the solenoid valve y2 is opened and the solenoid valve y1 is closed. The reed valves (a = hard pressure and b = soft tension) in the solenoid valve piston y1 cause a hard Pressure stage and a soft tension stage.

Damping Force Stage 3
This is achieved by the reed valves in the valve piston. If the body moves upwards, the solenoid valve y1 is opened and the solenoid valve y2 is closed. The reed valves (c = hard tension and d = soft pressure) in the solenoid valve piston y2 cause a hard tension stage and a soft pressure stage.

Damping Force Stage 4 (Safe Driving Stage)
For increased safe driving with high longitudinal and lateral accelerations of the vehicle. Both solenoid valves y1 and y2 are closed, the reed valves (a = hard pressure and c = hard tension) cause a hard pressure and tension stage. This damping force stage is also switched on in the event of ADS system faults and is displayed by means of the adaptive damping system (ADS) malfunction indicator lamp (A1e27) in the instrument cluster.






SWITCHING CONDITIONS OF DAMPING FORCE STAGES