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Steer-by-wire power steering system using actuators made transparent through use of local torque and/or force control loops

A technology of power steering and partial circuit, applied in the direction of power steering mechanism, steering mechanism, steering rod, etc., can solve the problem of unnatural feeling and so on

Pending Publication Date: 2020-10-23
JTEKT EURO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In "steer-by-wire" systems, when there is no mechanical linkage between the steering wheel and the wheels, this feeling can be particularly unnatural

Method used

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  • Steer-by-wire power steering system using actuators made transparent through use of local torque and/or force control loops
  • Steer-by-wire power steering system using actuators made transparent through use of local torque and/or force control loops
  • Steer-by-wire power steering system using actuators made transparent through use of local torque and/or force control loops

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Embodiment Construction

[0026] The invention relates to a power steering system 1 .

[0027] The power steering system 1 is intended for a vehicle, in particular a motor vehicle, preferably a wheeled motor vehicle comprising at least one steered wheel 12, which may preferably also be a drive wheel.

[0028] In a particularly preferred manner, said steered wheels 12 are front wheels of the vehicle.

[0029] Such as image 3 As shown, the power steering system 1 includes a first mechanism called "lower mechanism" 10, which includes an auxiliary motor 11 and steering wheels 12 (more preferably two steering wheels 12, in this case a left steering wheel 12L and one right steering wheel 12R), the auxiliary motor 11 acts on the steering wheel 12 to orient said steering wheel 12 in yaw.

[0030] Said lower mechanism 10 thus allows imparting a desired steering angle A12 to the steered wheels 12 .

[0031] In this case, preferably, the underlying mechanism thus forms a power mechanism intended to generate a...

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Abstract

The invention relates to a steer-by-wire power steering system (1) comprising a lower-level mechanism (10) that includes a servo motor (11) and a steered wheel (12), and an upper-level mechanism (20)that includes a steering wheel (22) and an auxiliary motor (21), the lower-level mechanism (10) being closed-loop controlled, at zero force, by a lower local loop (30) comprising a feedback branch (32) that measures or estimates an actual downstream force (F10_actual) downstream of the servo motor (11) and upstream of the point of contact (12C) between the wheel (12) and the ground (2), so as to make the servo motor (11) transparent, while the upper-level mechanism (20) is closed-loop controlled, at zero torque, by an upper local loop (40) comprising a feedback branch (42) which measures or estimates an actual driver torque (T20_actual) between the auxiliary motor (21) and the steering wheel (22) so as to make the auxiliary motor (21) transparent, the lower (30) and upper (40) local loopsbeing controlled by a single overall controller (50).

Description

technical field [0001] The present invention relates to the general field of power steering systems for vehicles. [0002] More specifically, the present invention relates to so-called "steer-by-wire" power steering systems which comprise, on the one hand, an upper mechanism comprising the steered wheels and, on the other hand, mechanically acting on the steered wheels of the vehicle to change the steering wheel. There is no mechanical transmission device between the lower mechanism of the auxiliary motor in the yaw direction (that is, the steering angle). Background technique [0003] In such steer-by-wire systems, it is known to ensure servo control in terms of the position of the underlying mechanism by measuring the angular position of the steering wheel and then defining and transmitting corresponding setpoints by means of an electrical link to the auxiliary motor, where the auxiliary An electric motor drives the lower mechanism, thereby driving the steering wheels to ...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/00
CPCB62D5/006B62D6/006B62D6/008B62D5/0475B62D7/18B62D5/003
Inventor 帕斯卡尔·穆莱尔安德烈·米凯利斯
Owner JTEKT EURO
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