US 12,240,521 B2
Method for fine-tuning a variable-gear steering column, and vehicle comprising a variable-gear power steering system
Pierre Larminy, Billy Sous les Cotes (FR); and André Michelis, Chonas l'Amballan (FR)
Assigned to JTEKT EUROPE, Irigny (FR)
Filed by JTEKT EUROPE, Irigny (FR)
Filed on Nov. 12, 2021, as Appl. No. 17/525,588.
Claims priority of application No. 20/11601 (FR), filed on Nov. 12, 2020.
Prior Publication US 2022/0144340 A1, May 12, 2022
Int. Cl. B62D 15/02 (2006.01)
CPC B62D 15/024 (2013.01) 8 Claims
OG exemplary drawing
 
1. A method for configuring a variable-gear steering column of a power steering system of a vehicle, the method comprising:
fine-tuning a relationship defining a gear ratio G of the variable-gear steering column according to a speed V of the vehicle, the gear ratio defining respectively a ratio between a position of a rack of the power steering system and an angular position of a steering wheel of the power steering system, or a ratio between an angular position of a steering wheel of the power steering system and a position of a rack of the power steering system, or a ratio between an angular position of a steering wheel of the power steering system and a yaw angular position of the steered wheels of the power steering system, the fine tuning comprising:
characterizing a desired handling of the vehicle for a first speed V1 of the vehicle and of characterizing a desired stability of the vehicle for a second speed V2 of the vehicle;
determining a first value G1 of the gear ratio allowing obtaining the desired handling at the first speed V1 of the vehicle, and a second value G2 of the gear ratio allowing obtaining the desired stability at the second speed V2 of the vehicle,
calculating a first parameter p1 and a second parameter p2 according to the first speed V1, the second speed V2, the first value G1 and the second value G2, so that the relationship between the gear ratio and the speed of the vehicle is defined by an equation
G=(p2+p1/V)n, with n=1 or n=−1
when the speed of the vehicle is comprised between a first threshold and a second threshold.