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SUSPENSION CONTROL SYSTEM OPERATION

id021400112500

## During Leveling Operation

• During shock absorber expansion, the inlet check valve opens due to negative pressure created in the pump chamber, and oil is drawn into the pump chamber from the low-pressure chamber. During shock absorber contraction, oil pressure in the pump chamber forces the outlet check valve to open, and oil in the pump chamber flows through the pump cylinder into the high-pressure chamber. Due to this expansion and contraction while driving, rod reaction force increases, and the vehicle height returns to the designated load level. Also, similar to a regular shock absorber, damping is performed while driving with the damping valve.

1 | Pump chamber
2 | Outlet check valve
3 | Inlet check valve
4 | Low-pressure chamber
5 | Damping valve
6 | High-pressure chamber
7 | Leveling operation (expansion)
8 | Leveling operation (contraction)

## Leveling Operation Completed

• When the vehicle height returns to the designated load level, the volume of oil in the high-pressure chamber increases and the piston rises. This causes the pump chamber and the high-pressure chamber to be connected at the pump rod notch, and the expansion or contraction is completed.

1 | Pump chamber
2 | Piston
3 | Pump rod notch
4 | High-pressure chamber

## During Unloading Of Passengers And Cargo

• When the vehicle height is higher than the designated load level, oil flows back into the low-pressure chamber from the high-pressure chamber via the pump rod leveling port. As a result, pressure in the high-pressure chamber decreases, rod reaction force is reduced, and the vehicle height returns to the designated load level.

1 | Leveling port
2 | Low-pressure chamber
3 | High-pressure chamber