A method of adjusting an estimated value of the height of the gravity center of a vehicle
AssigneeVolvo Truck Corporation
InventorsJean-Baptiste DORAY, Frédéric BEHOUCHE, Fabrice RANC
Life of this patent
Estimating the term…
Abstract
A method for adjusting an estimated height of the center of gravity (HCOG) value of a vehicle includes concomitant calculations, based on parameters dependent on the HCOG value and parameters independent from the HCOG value. The method further comprises the adjustment of a parameter related to the HCOG value.
Claims10
A method for adjusting an estimated height of the center of gravity (HCOG) value of a vehicle V, comprising a front axle and a rear axle, the method comprising the steps of:
- a) Determining the slippage rate (RF) for the wheels of a front axle and the slippage rate (RR) for the wheels of a rear axle during a braking period,
- b) Deducing from the slippage rate (RF) and (RR) determined in step a), the reference value (ΔNref) corresponding to the difference between the normal force (NF) applied to the wheels of the front axle and the normal force (NR) applied to the wheels of the rear axle, using parameters independent from the HCOG value,
- c) Determining the difference (ΔN) between the normal forces applied to the wheels of the front axle and the normal forces applied to the wheels of the rear axle, using a variable parameter (YG), related to the height of the gravity center,
- d) Comparing (ΔN) determined in step c) with (ΔNref) determined in step b),
- e) adjusting the variable parameter (YG),
- f) Adjusting the HCOG value according to (YG) determined in step e).
A method according to 4, wherein the normal forces (NF), (NR) are deduced in step b3) according to the formulae (2a) and (2b)
- AF
- =
- TF
- NF
- (
- 2
-
- a
- )
- AR
- =
- TR
- NR
- (
- 2
-
- b
- )
- Wherein
- (AF), (AR), denote the adherence determined in step b1)
- (TF), (TR) denote the tangential forces determined in step b2), and
- (NF), (NR), respectively denote the normal forces at the front wheels and at the rear wheels.
Dependencies are inferred from the claim text.