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DE-102022205254-B4 - Steering control device and steering control method

DE102022205254B4DE 102022205254 B4DE102022205254 B4DE 102022205254B4DE-102022205254-B4

Abstract

Steering control device (10) comprising: a receiver (110) that receives engine torque from an engine torque sensor provided in a host vehicle; and a control device (120) that makes it possible to drive a steering gear in a compliance zone, to calculate a friction of the steering gear based on the engine torque obtained by driving the steering gear, to determine a state of the steering gear based on the calculated friction and to issue a notification to a driver about the state of the steering gear, where the compliance zone is set to a range of engine positions in which a rack does not move even though the steering gear is driven. wherein the control device (120) controls the steering gear so that it is driven in the compliance zone before the host vehicle is steered by the driver, wherein the control device (120) determines that the steering gear is in a normal state when the calculated friction is less than a predetermined first reference value and greater than a predetermined second reference value, characterized in that the control device (120) stores the calculated friction and, if a result of the comparison between stored frictions shows that the friction is gradually increasing, determines that the steering gear has rust formations.

Inventors

  • Jong Chun WON

Assignees

  • HL MANDO CORPORATION

Dates

Publication Date
20260513
Application Date
20220525
Priority Date
20210528

Claims (8)

  1. Steering control device (10) comprising: a receiver (110) which receives an engine torque from an engine torque sensor provided in a host vehicle; and a control device (120) that enables a steering gear to be driven in a compliance zone, calculates the friction of the steering gear based on the engine torque obtained by driving the steering gear, determines the state of the steering gear based on the calculated friction, and issues a notification to a driver about the state of the steering gear, wherein the compliance zone is set to a range of engine positions in which a rack is not moved although the steering gear is driven, wherein the control device (120) controls the steering gear so that it is driven in the compliance zone before the host vehicle is steered by the driver, wherein the control device (120) determines that the steering gear is in a normal state when the calculated friction is less than a predetermined first reference value and greater than a predetermined second reference value, characterized in that the control device (120) stores the calculated friction and, if a result of the comparison between stored frictions shows that the friction is gradually increasing, determines that the steering gear has rust formations exhibits.
  2. Steering control device (10) according Claim 1 , characterized in that the control device (120) detects that the steering gear is damaged when the calculated friction is a preset first reference value or more.
  3. Steering control device (10) according Claim 1 or 2 , characterized in that the receiver (110) further receives a temperature from a temperature sensor provided in the host vehicle, and wherein the control device (120) determines that the state of the steering gear is an increase in friction due to a low temperature when the calculated friction is a preset first reference value or more and the temperature is a preset temperature or less.
  4. Steering control device (10) according to one of the Claims 1 until 3 , characterized in that the control device (120) detects that the steering gear is worn when the calculated friction is a preset second reference value or less.
  5. Steering control procedure comprising: an information reception step (S510) that receives an engine torque from an engine torque sensor provided in a host vehicle; a friction calculation step (S520) that enables a steering gear to be driven in a compliance zone and a steering gear friction to be calculated based on the engine torque obtained by driving the steering gear; and a state determination step (S530) that a state of the steering gear is determined based on the calculated friction, wherein the compliance zone is set to a range of engine positions in which a rack is not moved although the steering gear is driven, wherein the state determination step (S530) controls the steering gear so that it is driven in the compliance zone before the host vehicle is steered by the driver, wherein the state determination step (S530) determines that the steering gear is in a normal state when the calculated friction is less than a predetermined first reference value and greater than a predetermined second reference value, characterized in that the state determination step (S530) stores the calculated friction and, if a result of the comparison between stored frictions shows that the friction is gradually increasing, determines that the steering gear is rusting.
  6. Steering control procedure according to Claim 5 , characterized in that the condition determination step (S530) determines that the steering gear is damaged if the calculated friction is a preset first reference value or higher.
  7. Steering control procedure according to Claim 5 or 6 , characterized in that the information reception step (S510) further receives a temperature from a temperature sensor provided in the host vehicle, and wherein the state determination step (S530) determines that the state of the steering gear is an increase in friction due to a low temperature when the calculated friction is a preset first reference value or more and the temperature is a preset temperature or less.
  8. Steering control procedure according to one of the Claims 5 until 7 , characterized in that the condition determination step (S530) determines that the steering gear is worn when the calculated friction is a preset second reference value or less.

Description

BACKGROUND The present invention relates to a steering control device according to the preamble of claim 1 and to a steering control method according to the preamble of claim 5. Area Description of the related technique The electric steering device detects the steering torque generated by the rotation of the steering wheel and controls the motor so that it provides steering assistance proportional to the detected steering torque, thereby controlling the steering of the vehicle. In electronic power steering, the steering torque generated by turning the steering wheel is transmitted to the rack via the rack-and-pinion mechanism, and the power steering assistance generated by the motor, which depends on the steering torque, is also transmitted to the rack. In other words, the power steering assistance generated by the motor is added to the steering torque generated by the steering wheel, causing the rack to move axially and thus steering the vehicle. In such an electronic power steering system, a reduction in friction between several components, such as the rack and pinion mechanism or the reduction gear of the mechanism comprising the device, can occur, for example, due to wear on the components or decreasing fastening force, which can occur with increasing vehicle mileage. Another example is that the rack and pinion mechanism or the reduction gear can develop rust, thereby increasing friction between several parts of the mechanism. (From the generic publication) DE 10 2014 201 952 A1 A method for detecting increased friction in a servo-assisted rack and pinion steering system is known, in which an electric servomotor is coupled to a rack and pinion of the steering system via a ball screw drive. The electric servomotor is supplied with a test current of a predetermined current strength, and any change in the position of a rotor of the electric servomotor resulting from this current is recorded. The recorded change in position is then compared with a predetermined expected change in position, and a state of friction is determined based on the result. Further methods for determining a changed state of friction are described in [reference to be added]. DE 10 2013 220 519 A1 and DE 10 2018 217 474 A1 known. An increase or decrease in friction between the internal components of the electronic power steering system can cause the driver to experience an unpleasant sensation when steering. The aforementioned problems are solved by a steering control device with the features of claim 1, and by a steering control method with the features of claim 5. Possible embodiments are set forth in the dependent claims. In one aspect, the disclosure provides for a steering control device which, in particular, comprises a receiver that receives engine torque from an engine torque sensor provided in a host vehicle, and a control device that enables a steering gear to be driven within a compliance zone, which calculates the friction of the steering gear based on the engine torque received by driving the steering gear, determines a state of the steering gear based on the calculated friction, and outputs a message to a driver regarding the state of the steering gear. In another aspect, the disclosure provides for a steering control method which includes, in particular, an information reception step that receives an engine torque from an engine torque sensor provided in a host vehicle, a friction calculation step that enables a steering gear to be driven in a compliance zone and that calculates a friction of the steering gear based on the engine torque received by the drive of the steering gear, and a state determination step that determines a state of the steering gear based on the calculated friction. According to the disclosure, the steering control device and the method can calculate and quantify the friction of the steering gear and determine the condition of the steering gear according to the calculated friction. DESCRIPTION OF THE DRAWINGS The foregoing and further tasks, features and advantages of the disclosure will become clearer from the following detailed description when it is taken into account together with the accompanying drawings, in which: 1 a block diagram illustrating a steering control device according to an embodiment of the disclosure; 2 a schematic representation of a steering control system according to an exemplary embodiment; 3 and 4 The views shown are an example of calculating friction using a compliance zone according to an embodiment; 5 a flowchart illustrating a steering control procedure according to an embodiment of the disclosure; 6 a flowchart that illustrates step S520 in more detail according to an exemplary embodiment; and 7 a view that shows step S530 in more detail according to an exemplary embodiment. DETAILED DESCRIPTION In the following description of examples or embodiments of the disclosure, reference is made to the accompanying drawings, which show specific examples or embodiments that can