Method and apparatus for adjusting and maintaining the height of a spring-action passenger seat

An apparatus for adjusting and maintaining the absolute seating surface height of a spring-action passenger seat, independent of interference factors, particularly in a motor vehicle, comprising:

• a) means for adjusting a first, stationary basic component of the absolute seating surface height value;
• b) means for adjusting a second, quasi-stationary regulation component of the absolute seating surface height value;
• c) a resiliency regulation mechanism controlling the means for adjusting the second, quasi-stationary regulation component to allow dampened oscillations of the seat around a reference value for the second, quasi-stationary regulation component;
• and
• d) a measurement device continuously detecting the value of the second, quasi-stationary regulation component and deriving a time average value of the second quasi-stationary regulation component from the measurement values and providing this time average value to the regulation mechanism, wherein said regulation mechanism controls said means for adjusting the second, quasi-stationary regulation component so that the time average value of the second quasi-stationary regulation component of the absolute seating surface height approaches the value of the reference value independent of the actual weight of a person resting on the seat.