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Electronic stability control (ESC) system is well known as a method to assist the driver in recovering from unintended situations, such as understeering and oversteering behaviors. One of issues of this ESC is precise distribution of the brake force for generation of the vehicle yaw moment. In this paper, a new design of ESC systems is proposed. First, the model based controller with vehicle bicycle...
In the robot research field, ultrasonic sensors have been highly employed for a long time. However, the sensors have used in the limited applications for near distance measuring, because ultrasonic sensor has some following limitations: low sampling rate, short detection range, and vulnerable to environmental noise. To overcome these limitations, the goal of this research is proposing new operating...
The vehicle industry has applied active suspension system for a long time to enhance ride-quality and driving stability. However, only a small improvement is seen in the absence of a preview sensor, and thus it is an integral component in designing active suspension systems. Devices such as stereo vision, lidar, and radar systems thus far have been used when building preview information for active...
This paper suggests a position/force hybrid controller for the dry dual clutch transmission actuators that provides accurate desired clutch normal force tracking performance and also dramatically reduces clutch-transferred torque fluctuation and wheel jerk during vehicle launch and gear shifts when compared to conventional position-based controllers. The proposed controller is composed of a multiple...
This paper suggests a dry dual clutch transmission actuator controller for simultaneous kissing point identification by using multiple sliding surfaces, so that the actuator motor positions at the clutch kissing point of both clutches can be estimated during the first launching after the car starts. Such maneuver can be especially advantageous for the vehicles without ROM that keeps the recent kissing...
This study mainly focuses on the accurate estimation of the output shaft torque — and thus the clutch torque — of the automated manual transmissions as well as dual clutch transmissions, using the data available in the current production vehicles. The required information includes the nominal engine torque map and measurements of engine speed, clutch speed, and wheel speed. Utilizing the above-mentioned...
Clutch torque estimation is an important problem in automotive transmission control. The self-energizing clutch actuator system has a novel mechanism to amplify the clutch torque for reducing actuation energy. The nonlinear disturbance observer is designed such that the clutch torque is estimated with guaranteeing asymptotic convergence by using the actuation motor measurement signal. The simulation...
This paper proposes a control scheme based on robust internal-loop compensator for a clutch positioning system. The purpose of control is to achieve a precise position control of automotive dry-clutch actuator system module. Overall system consists of the electric motor and the mechanical subsystem. A set of dynamic model is developed and validated experimentally. Robust internal-loop compensator...
Information of vehicle mass is crucial for vehicle safety control. Vehicle mass value is treated as a constant value for ESP(Electronic Stability Program) and other vehicle safety controls, but it varies with the number of passengers or the weight of load vehicle carries. This paper suggests an integrated mass estimation algorithm based on a recursive least square method and parameter adaptation....
This paper suggests a modified a semi-active vehicle suspension design based on the conventional skyhook damper mechanism. The skyhook algorithm is modified using the fuzzy logic control and a 6D IMU which measures the accelerations and angular rates of the vehicle about its C.G. to observe the vertical velocities of the sprung mass of each corner. Also, the proposed scheme utilizes the spring compression...
Gearshift control is one of the main functions of automotive transmissions. The proposed control utilizes the functionality of Dual Clutch Transmissions (DCTs) that two control inputs are available incorporating each other. During gearshift operation, each clutch is controlled uni-directionally to prevent undesirable effects such as dead zone nonlinearity, saturation, and etc. Even though they have...
Automated Manual Transmission vehicles are generally equipped with the servo-actuated clutch engagement system. In that system, shift quality depends on the engaging time and controlling the clutch normal force. It is therefore crucial to pay attention to the control performance in order to guarantee smooth engagement of the clutch. This article proposes the control architecture that consists of the...
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