Design and Development of a Functional Safety Compliant Electric Power Steering System

Lee, Kyung-Jung; Lee, Kiho; Moon, Chanwoo; Chang, Hyun‐Kyung; Ahn, Hyun-Sik

doi:10.5370/jeet.2015.10.4.1915

Cited by 4 publications

(2 citation statements)

References 11 publications

(12 reference statements)

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“…According to the motor theory, the following expression is given:

where

is the magnetic field strength of the motor stator,

and

are positive number dependent on the magnetic field strength

is speed of the motor shaft,

is the motor torque. Assuming that

is constant, then

and

are constants, and denoted as

and

, respectively [ 21 , 22 ].…”

Section: Model Of Eps Systemsmentioning

confidence: 99%

Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems

Tang

2018

Sensors

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This paper presents a complete control strategy of the active return-to-center (RTC) control for electric power steering (EPS) systems. We first establish the mathematical model of the EPS system and analyze the source and influence of the self-aligning torque (SAT). Second, based on the feedback signals of steering column torque and steering wheel angle, we give the trigger conditions of a state switch between the steering assist state and the RTC state. In order to avoid the sudden change of the output torque for the driving motor when the state switches frequently between the steering assist state and the RTC state, we design an undisturbed state switching logic algorithm. This state switching logic algorithm ensures that the output value of the RTC controller is set to an initial value and increases in given steps up to a maximum value after entering the RTC state, and the output value of the RTC controller will reduce in given steps down to zero when exiting the RTC state. This therefore ensures smooth switch control between the two states and improves the driver’s steering feeling. Third, we design the RTC controller, which depends upon the feedback signals of the steering wheel angle and the angular velocity. In addition, the controller increases the auxiliary control function of the RTC torque based on vehicle speed. The experimental results show that the active RTC control method does not affect the basic assist characteristics, which effectively reduces the residual angle of the steering wheel at low vehicle speed and improves the RTC performance of the vehicle.

show abstract

“…According to the motor theory, the following expression is given:

where

is the magnetic field strength of the motor stator,

and

are positive number dependent on the magnetic field strength

is speed of the motor shaft,

is the motor torque. Assuming that

is constant, then

and

are constants, and denoted as

and

, respectively [ 21 , 22 ].…”

Section: Model Of Eps Systemsmentioning

confidence: 99%

Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems

Tang

2018

Sensors

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show abstract

“…The main research directions in this field include designing, developing, determining, and verifying a control system. 11,12 The SIL evaluation process is a combination of the probability of failure per hour (PFH), the severity of injury, the exposure time to the hazard, the possibility of avoiding the hazard, and the occurrence probability. The SIL evaluation method merges the concepts of fault analysis and failure probability in reliability engineering.…”

Section: Related Workmentioning

confidence: 99%

Safety integrity level evaluation of nuclear centrifugal pump based on performance degradation data

Zhao

Wang

2018

Advances in Mechanical Engineering

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To reduce personnel and equipment risks related to centrifugal pumps in nuclear power plants, safety integrity level for centrifugal pumps must be evaluated. The safety integrity level evaluation methods in the IEC 61508 standard depend on statistical historical failure-dependent data and static threshold. However, for centrifugal pumps in nuclear power plants, the statistical historical failure-dependent data are insufficient, and the static threshold is not easily determined, especially under dynamically changing operation conditions. To overcome the aforementioned problems, this article proposes a safety integrity level evaluation method for centrifugal pumps based on the performance degradation data. This method constructs a Wiener degradation model to describe the degradation process of centrifugal pumps. The degradation trajectories in the upcoming cycles are predicted using a particle filter algorithm. The degradation trajectories with high credibility are selected based on reputation index. The failure time of each selected degradation trajectory is judged using catastrophe theory. The safety integrity levels are defined by performance degradation threshold on demand. Experiments are performed using the simulation data and the component cooling water pump condition-monitoring data set. By comparing to the risk matrix analysis recommended in the IEC 61508 standard, the proposed method is more reasonable and obeys the rule of the bathtub-shaped curve.

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Equivalent Circuit Analysis of Induction Motors Considering Magnetic Saturation for Automotive Applications

Kim

Han

Kim

2020

J. Electr. Eng. Technol.

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Design and Development of a Functional Safety Compliant Electric Power Steering System

Cited by 4 publications

References 11 publications

Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems

Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems

Safety integrity level evaluation of nuclear centrifugal pump based on performance degradation data

Equivalent Circuit Analysis of Induction Motors Considering Magnetic Saturation for Automotive Applications

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