Sprung mass estimating apparatus

Details Sprung mass estimating apparatus Sprung mass estimating apparatus

1999-06-15

2000-04-25

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

701 38, 280 55, 280 5505, 280 5515, 248550, 248636, B60G 2300, B60G 2100

Patent

active

060554711

ABSTRACT:
A sprung mass estimating apparatus applied to a vehicle having a suspension device detects a sprung mass acceleration "a" and an amount of relative displacement "s" of a sprung member relative to an unsprung member by using an acceleration sensor and a stroke sensor, respectively. The apparatus calculates a relative velocity ds/dt based on the amount of relative displacement "s". The apparatus then derives a damping force F corresponding to the relative velocity ds/dt and a set switch level of the damping coefficient, with reference to a damping force characteristic table. Based on a data row a(k), a data row s(k) and a data row F(k) (where k=1, 2, . . . , N) indicating sprung mass accelerations "a", amounts of relative displacement "s", and damping forces F obtained over such a sufficiently long time that the ratio .beta. of the spring constant to the sprung mass M can be considered constant, the apparatus calculates a sprung mass M. Therefore, the apparatus is able to estimate a sprung mass even during a vehicle travel, without requiring a complicated construction.

REFERENCES:
patent: 4700971 (1987-10-01), Doi et al.
patent: 4969662 (1990-11-01), Stuart
patent: 5732370 (1998-03-01), Boyle et al.
patent: 5781873 (1998-07-01), Sasaki

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