US 2017/0247048 A1Published application

Steering Control Device

AssigneeJtekt Corporation

InventorsIsao NAMIKAWA, Terutaka TAMAIZUMI

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Abstract

A steering control device capable of transmitting road surface state to a driver is provided. An ideal vehicle model computes first spring reaction force torque based on a target pinion angle and second spring reaction force torque based on at least lateral acceleration as components of a spring component of a steering assist force. The ideal vehicle model combines the first and second spring reaction force torques with specified proportions of use to compute the spring component. The ideal vehicle model decides the proportions of use of the first and second spring reaction force torques on the basis of a distribution gain set in accordance with the difference value between the first and second spring reaction force torques. The ideal vehicle model increases the proportion of use of the second spring reaction force torque as the difference value between the first and second spring reaction force torques is increased.

Claims6

Dependent claims

A steering control device that controls a motor that serves as a generation source for a drive force to be applied to a steering mechanism of a vehicle on the basis of an assist command value computed in accordance with a steering operation, comprising:

a first computation circuit that computes a basic component of the assist command value in accordance with at least steering torque;
and
a second computation circuit that computes a compensation component for the basic component through feedback control in which an actual rotational angle of a rotary body that rotates through the steering operation is caused to coincide with a target rotational angle calculated in accordance with the basic component, wherein
the second computation circuit computes, on the basis of at least the target rotational angle, a first reaction force component for the basic component that is used to compute the target rotational angle,
and the second computation circuit computes, on the basis of a state amount that reflects vehicle behavior or a road surface state, a second reaction force component for the basic component that is used to compute the target rotational angle,
and the second computation circuit, in a case where a difference value between the first reaction force component and the second reaction force component is increased, increases a proportion of use of the second reaction force component compared to that before the difference value is increased.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/434,162Filed 16 Feb 2017
Priority: JP 2016-03552226 Feb 2016
Published: 31 Aug 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B62D 5/0463
Controlling the motor: calculating assisting torque from the motor based on driver input
B62D 3/12
Mechanical: of rack-and-pinion type
B62D 5/0412
Electric motor acting on the steering column: the axes of motor and steering column being parallel
B62D 6/006
Computing target steering angles for front or rear wheels: using a measured or estimated road friction coefficient

Family

US 9,889,879 B2Related patent
US 2017/0247048 A1This patent

From the US filing history. Foreign family members aren’t listed.

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