	US 12,187,136 B2
	Method for determining an optimized torque distribution to the drive wheels of a road vehicle and relative road vehicle
Alessandro Flumeri, Modena (IT); Francesca Mincigrucci, Modena (IT); and Stefano Varisco, Modena (IT)
Assigned to FERRARI S.P.A., Modena (IT)
Filed by FERRARI S.p.A., Modena (IT)
Filed on Jul. 25, 2022, as Appl. No. 17/872,413.
Claims priority of application No. 102021000021065 (IT), filed on Aug. 4, 2021.
Prior Publication US 2023/0051786 A1, Feb. 16, 2023
Int. Cl. B60L 15/20 (2006.01); B60K 1/02 (2006.01); B60L 15/32 (2006.01)

CPC B60L 15/2036 (2013.01) [B60K 1/02 (2013.01); B60L 15/32 (2013.01); B60L 2240/16 (2013.01); B60L 2240/18 (2013.01); B60L 2240/22 (2013.01); B60L 2240/24 (2013.01); B60L 2240/423 (2013.01); B60L 2260/28 (2013.01)]

14 Claims

1. A method for determining an optimized torque distribution to wheels (2, 3) of a road vehicle (1); the road vehicle (1) comprising an actuator (A, 5) for each of the wheels (2, 3) to independently control a torque (TFR, TFL, TRR, TRL) associated with each wheel; the method comprising:

determining once a first table (ST′) of torque distribution between a front axle (FA) and a rear axle (RA) of the road vehicle (1), which provides a first curve (DC′) representative of a first torque distribution factor (AWDS) as a function of a variation of longitudinal dynamics of longitudinal acceleration and longitudinal speed (Ax, Vx), respectively, of the road vehicle (1);

determining once a second (ST″ and a third (ST″) torque distribution table between a right (2, 3) wheel and a left (2, 3) wheel, respectively, of the rear (RA) axle and the front (FA) axle of the road vehicle (1), wherein the second and third torque distribution tables (ST″, ST″) provide second and third curves (DC″, DC″), respectively, representative of a second torque distribution factor (RLS) and a third (RLS′) torque distribution factor as a function of the variation of the longitudinal dynamics of the road vehicle (1);

detecting a current state of the longitudinal dynamics of the road vehicle (1) while driving through a curve;

using the first, second and third torque distribution tables (ST′, ST″, ST″) to determine a present value of the first torque distribution factor (AWDS), the second torque distribution factor (RLS) and the third torque distribution factor (RLS′), respectively, based on the present longitudinal (Vx) speed and the present longitudinal (Ax) acceleration of the road vehicle (1);

wherein the first torque distribution factor (AWDS), the second torque distribution factor (RLS) and third torque distribution factor (RLS′) distribution factors are configured to maximize, for a current longitudinal speed (Vx) and current longitudinal acceleration (Ax), a lateral acceleration (Ay) of the road vehicle (1);

determining a point (PM) of maximum performance in order to calculate a point of the first, second or third curve (DC′, DC″, DC″′) by imposing a steering angle and an attitude angle (β) of the road vehicle (1) and calculating the maximum of the lateral acceleration (Ay) of the road vehicle (1) under said conditions;

wherein the point (PM) of maximum performance is determined by an intersection of a first curve (CIA) iso of the steering angle and a second curve (CIB) iso of the attitude angle.