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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...
Path planning problem for a vehicle group in a two-dimensional obstructed environment is addressed. The kinematics equations of the vehicles on a plane with ideal connections are considered. Then a method is proposed for planning motion paths based on the interpretation of all the neighboring objects as repellers. The method on the basis of simple algorithms implemented in design of vehicles enables...
Inspection of the structural health of the bridge column is very important task but near-water surface region is dangerous for structural health monitoring robots due to water tides and spray. The unmanned surface vehicle with vertical thrusting function was developed to attach bridge column regardless of the surface status or material for close inspection and minimizing turbulence or external flow...
In this paper, a feasibility study is conducted to estimate the pose of a vehicle based on a mono-camera using road direction signs and a public online database. The proposed algorithm uses a mono-camera to detect and segment the road direction sign and matches the detected sign image with the reference image in the database to calculate the relative pose between the road sign and the vehicle. Using...
This paper addresses the use of a subset of genetic algorithms, an artificial immune system, to increase the responsiveness and accuracy of fault tolerant control in an over-actuated vehicle. These algorithms allow both inexact a priori to be easily incorporated into a model to represent the vehicle even within dynamic fault states.
Recently, welfare vehicles are widely used by patients and elders indoors, and many welfare vehicles with free casters drive indoors. However, the vehicle with free casters may not be able to move well on gravel or dirty road as seen in rural yard. In order to expand driving area for welfare vehicles, it is necessary to apply a new mechanism on the rough road. To design compact welfare vehicles for...
We propose a small electric vehicle with a low-powered battery (7.2 V, ∼2 Ah) for use by the elderly during shopping. Accordingly, we have fabricated small sitting position-type electric vehicles in previous projects. In this study, we developed a small compact standing position ride-type electric vehicle for easy shopping. This vehicle is expected to reduce the physical burden in the getting on-off...
In this paper, road roughness model for the right and the left tracks are constructed by utilizing two methods. In the first method, from time-domain measurements the empirical auto and cross-power spectral densities of the left and the right tracks are estimated by using the Welch method. Next, the road roughness is decomposed into three stochastically independent random processes and the linear-shape...
Path tracking control for autonomous vehicle using model predictive control (MPC) algorithm maintains maneuverability by calculating a sequence of control input which minimizes a tracking error. The weakness of this method is that the performance of MPC may decrease significantly when the priori prediction model is not accurate. Therefore, it is important to keep the vehicle stable when MPC having...
To analyze the driving behavior is important for design a comfortable automatic driving. So far, conventional PID models was widely used to steer the vehicle. It had been assumed that the driver looks at the constant point in conventional PID model. However, all drivers have experiences that the gazing distance changes according to the situations. The PID gain of the steering model are modified depending...
In many cases, solving optimisation problems, in particular a dynamic optimisation problem, is time-consuming. This is due to the long time of calculation of the objective function value. For example, during optimisation of the articulated vehicle it is necessary to integrate dynamic equations of motion in the whole time interval. The paper presents an application of own algorithm (EVCA) for reduction...
The conventional steering principle (Ackerman theory) for existing steering systems of a multi-axle cane determines the steering angle of each axle by focusing on minimizing the slip angles rather than enhancing a driver's steering efficiency. Therefore, this paper proposed a LQR-based adaptive steering control algorithm of a multi-axle crane which solves the optimal steering angles to improve the...
This paper proposes a method for fused navigation of an unmanned marine surface vehicle (UMSV). The method also detects the outlier and interference of global positioning system (GPS) simultaneously. The method fuses available sensor measurements through extended Kalman filter (EKF) to find the location and attitude of the vehicle. The method uses error covariance of estimated location for detection...
This paper presents a method which detects and tracks objects for navigation of a maritime surface vehicle. The method uses stereo vision system which finds saliency map, calculates disparity and distance from the stereo vision image. The method adopts frequency-tuned saliency map and finds dissimilar area in the image with the template which is found by the salient region detection. It is possible...
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