• Title, Summary, Keyword: ESP(Electronic Stability Program)

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A Study on the Development of a Real Time Simulator for the ESP (Electronic Stability Program) (전자식 차체 자세 제어 장치를 위한 실시간 시뮬레이터 개발에 관한 연구)

  • Kim, Tae Un;Cheon, Seyoung;Yang, Soon Young
    • Journal of Drive and Control
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    • v.16 no.4
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    • pp.48-55
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    • 2019
  • The Electronic Stability Program (ESP), a system that improves vehicle safety, also known as YMC (Yaw Motion Controller) or VDC (Vehicle Dynamics Control), is a system that operates in unstable or sudden driving and braking situations. Developing conditions such as unstable or sudden driving and braking situations in a vehicle are very dangerous unless you are an experienced professional driver. Additionally, many repetitive tests are required to collect reliable data, and there are many variables to consider such as changes in the weather, road surface, and tire condition. To overcome this problem, in this paper, hardware and control software such as the ESP controller, vehicle engine, ABS, and TCS module, composed of three control zones, are modeled using MATLAB/SIMULINK, and the vehicle, climate, and road surface. Various environmental variables such as the driving course were modeled and studied for the real-time ESP real-time simulator that can be repeatedly tested under the same conditions.

A Study on Integrated Control of AFS and ESP for the improvement of vehicle handing performance (차량 주행성능 향상을 위한 AFS 와 ESP 의 협조제어에 관한 연구)

  • Park In-Hye;Park Ki-Hong
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.511-514
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    • 2005
  • This paper propose an advanced control strategy to improve vehicle handling and directional stability by integrating Active Front Steering(AFS) with Electronic Stability Program(ESP) . The effect of the integrated control system on the vehicle handling characteristics and directional stability is studied through a close loop computer simulation of and eight degree of freedom nonlinear vehicle model and driver model. Simulation results confirm the effectiveness of the proposed control system and the overall improvements in vehicle handling and directional stability

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CONTROL PHILOSOPHY AND ROBUSTNESS OF ELECTRONIC STABILITY PROGRAM FOR THE ENHANCEMENT OF VEHICLE STABILITY

  • Kim, D.S.;Hwang, I.Y.
    • International Journal of Automotive Technology
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    • v.7 no.2
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    • pp.201-208
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    • 2006
  • This paper describes the control philosophy of ESP(Electronic Stability Program) which consists of the stability control the fault diagnosis and the fault tolerant control. Besides the functional performance of the stability control, robustness of control and fault diagnosis is focused to avoid the unnecessary activation of the controller. The look-up tables are mentioned to have the accurate target yaw rate of the vehicle and obtained from vehicle tests for the whole operation range of the steering wheel angle and the vehicle speed. The wheel slip control with a design goal of wheel slip invariance is implemented for the yaw compensation and the target wheel slip is determined by difference between the target yaw rate and actual yaw rate. Since the ESP has a high severity level and the robust control is required, the robustness margin for the stability control is determined according to several uncertainties and the robust fault diagnosis is performed. Both computer simulation and test results are shown in this paper.

Development and Performance Evaluation of ESP Systems for Enhancing the Lateral Stability During Cornering (차량의 선회시 주행 안정성 강화를 위한 ESP 시스템 개발 및 성능 평가)

  • Boo Kwang-Suck;Song Jeong-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.10
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    • pp.1276-1283
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    • 2006
  • This study proposes two ESP systems which are designed to enhance the lateral stability of a vehicle. A BESP uses an inner rear wheel braking pressure controller, while a EBESP employs an inner rear wheel and front outer wheel braking pressure controller. The performances of the BESP and EBESP are evaluated for various road conditions and steering inputs. They reduce the slip angle and eliminate variation in the lateral acceleration, which increase the controllability and stability of the vehicle. However EBESP enhances the lateral stability and comfort. A driver model is also developed to control the steer angle input. It shows good performances because the vehicle tracks the desired lane very well.

DEVELOPMENT OF HARDWARE-IN-THE-LOOP SIMULATION SYSTEM AS A TESTBENCH FOR ESP UNIT

  • Lee, S.J.;Park, K.;Hwang, T.H.;Hwang, J.H.;Jung, Y.C.;Kim, Y.J.
    • International Journal of Automotive Technology
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    • v.8 no.2
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    • pp.203-209
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    • 2007
  • As the vehicle electronic control technology quickly grows and becomes more sophisticated, a more efficient means than the traditional in-vehicle driving test is required for the design, testing, and tuning of electronic control units (ECU). For this purpose, the hardware-in-the-loop simulation (HILS) scheme is very promising, since significant portions of actual driving test procedures can be replaced by HIL simulation. The HILS incorporates hardware components in the numerical simulation environment, and this yields results with better credibility than pure numerical simulations can offer. In this study, a HILS system has been developed for ESP (Electronic Stability Program) ECUs. The system consists of the hardware component, which that includes the hydraulic brake mechanism and an ESP ECU, the software component, which virtually implements vehicle dynamics with visualization, and the interface component, which links these two parts together. The validity of HIL simulation is largely contingent upon the accuracy of the vehicle model. To account for this, the HILS system in this research used the commercial software CarSim to generate a detailed full vehicle model, and its parameters were set by using design data, SPMD (Suspension Parameter Measurement Device) data, and data from actual vehicle tests. Using the developed HILS system, performance of a commercial ESP ECU was evaluated for a virtual vehicle under various driving conditions. This HILS system, with its reliability, will be used in various applications that include durability testing, benchmarking and comparison of commercial ECUs, and detection of fault and malfunction of ESP ECUs.

Development and Evaluation of ESP Systems for Enhancement of Vehicle Stability during Cornering (II) (차량의 선회시 주행 안정성 강화를 위한 ESP 시스템 개발 및 성능 평가 (II))

  • Song, Jeong-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.12
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    • pp.1551-1556
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    • 2006
  • Two yaw motion control systems that improve a vehicle lateral stability are proposed in this study: a rear wheel steering yaw motion controller (SESP) and an enhanced rear wheel steering yaw motion controller (ESESP). A SESP controls the rear wheels, while an ESESP steers the rear wheels and front outer wheel to allow the yaw rate to track the reference yaw rate. A 15 degree-of-freedom vehicle model, simplified steering system model, and driver model are used to evaluate the proposed SESP and ESESP. A robust anti-lock braking system (ABS) controller is also designed and developed. The performance of the SESP and ESESP are evaluated under various road conditions and driving inputs. They reduce the slip angle when braking and steering inputs are applied simultaneously, thereby increasing the controllability and stability of the vehicle on slippery roads.

Development of Hydraulic Simulation Model for ESP Real Time Simulation (전자식 차체 자세제어 장치 실시간 시뮬레이션을 위한 유압 모델 개발)

  • Cheon, Se Young;Choi, Seong Woong;Yang, Soon Yong
    • Journal of Drive and Control
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    • v.16 no.2
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    • pp.36-42
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    • 2019
  • The ESP (Electronic Stability Program) is an active control system that controls the posture of the vehicle by sensing the unstable state of the vehicle during braking, driving, or turning. The system works if the vehicle becomes unstable and it is very dangerous to develop it in the actual vehicle. For this reason, many studies have been carried out on the method of developing with simulation such as SIL / EIL. Some advanced companies have already applied it to the product development process. In this study, ESP hydraulic system and braking device model were constructed using SimulationX to build ESP SIL / EIL model. The hydraulic system model was constructed using the actual design parameters and the performance of the hydraulic model was verified by comparing with the actual vehicle test.

Failsafe Logic for a vehicle Stability Control System (차량 주행안정성 제어시스템의 자동안전 로직)

  • Min, Kyung-Chan;Lee, Gun-Bok;Yi, Kyoung-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.11
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    • pp.1685-1691
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    • 2004
  • This paper describes the fault detection and failsafe logic to be used in an Electronic Stability Program(ESP). The aim of this paper is to prevent of erroneous controls in the ESP. Developed this paper introduces the fault detection logic and evaluation of residual signals. The failsafe logic consists of four redundant sub-models, which can be used for detecting the faults in various sensors (yaw rate, lateral acceleration, steering wheel angle). We present two mathematical residual generation methods : one is a method using the average value and the other is a method using the minimum value of the each residual. We verified a failsafe logic developed using vehicle test results also we compare vehicle model based simulation results with test vehicle results.