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According to the principle of the gear overall size as small as possible, the structural analysis of multistage micro-planetary transmission is carried out. It is found that a 2K-H multistage micro-planetary gear reducer meets with the principle requirement. On this basis of the torque, power balance equations and force analysis of the basic members, the power distributions of a 2K-H multistage micro-planetary...
The rollover warning technology reported in this paper focuses on detection of heavy duty truck real-time rollover propensities. The paper suggests a new algorithm of rollover warning for heavy duty vehicle based on Kalman filter technology. Its feasibility for implementation in a heavy duty truck rollover threat detection system is demonstrated through vehicle dynamic simulation studies. The effectiveness...
This paper proposes a real-time rollover threat warning system (RWS) of heavy duty vehicle. The function of RWS is used to determine the rollover threat of heavy duty vehicle and warn the driver to adjust the operation during dangerous conditions. The paper suggests a new algorithm of rollover warning for heavy duty vehicle based on accurate PTR metric. The effectiveness of the RWS is validated by...
This paper presents a novel approach for designing robust vehicle rollover prevention controllers. The control methodology is based on guaranteeing a set of linear matrix inequality (LMI) conditions, which results in controllers that are robust stable. An active braking control is used to decrease the rollover risk of heavy vehicles. The paper also obtains the controller which can adopt the robustness...
A simplified 6-axle linear vehicle model to determine the stability control associated with tractor semi-trailers is proposed. The propose of this model is to describe the vehicle dynamics accurately so as to design the active safety controller well. Verification of the 6-axle planar model is performed by putting drastically handling maneuver inputs into the model steering, then comparing the response...
The active safety and stability of tractor semi-trailer have becoming big concern among the road transportation industry. The paper sets up a six-axle plane dynamic model for simulating the yaw/roll stability of heavy tractor semi-trailer using Matlab/Simulink. LQR controller is chosen to produce the optimum compensate yaw moment to correct the vehicle path based on the bias of yaw rate and lateral...
Heavy truck rollovers are dangerous and possibly fatal accidents. This paper discusses a robust control algorithm to improve the roll stability of heavy trucks. The controller minimizes the lateral load transfer (LTR) to reduce the rollover probability using differential braking. The paper also designs the robust controller which can adopt the robustness to variations in vehicle speed. The simulation...
Vehicle stability control for the vehicle is investigated using electro-hydraulic brake (EHB) control in this paper. It describes a vehicle stability controller based on Electro-Hydraulic Braking (EHB) System which acts on the brake system to generate a corrective yaw moment that helps the vehicle to follow the course desired by the driver. A cosimulation system for EHB has been developed in this...
An roll control algorithm of SUV based on SIA skyhook control strategy is proposed in this paper. Theoretical model is developed for the roll control of semi-active suspension of sport utility vehicle using Skyhook control algorithm. In this paper it presents a new control strategy-SIA skyhook control strategy for enhancing vehicle roll stability and does not affect the normal vehicle ride comfort...
This paper sets up a vehicle dynamic model which is used to determine rollover risk of heavy truck under various driving conditions. Using this real-time dynamic model, it proposes a new measure of performance for vehicle rollover prevention, the Load Transfer Ratio (LTR), and design the differential braking controller based on LMI robust control to prevent rollover occur. The paper also obtains the...
Active/semi-active suspension systems are getting widely accepted for their potential to improve ride comfort of passenger cars. In this work, the paper develops the model of magnetorheological fluid (MRF) damper to describe the hysteretic behaviors and damper characteristic. It used the modeling-after-test method to establish an accurate MRF-damper model, and the MRF damper model is consecutive adjustable...
The best advantage of the DYC is it can greatly improve vehicle handling and stability. It is proposed integrated control of four wheel steering systems (4WS) and direct yaw moment control. A desirable vehicle model is established with the best performance of side slip angle and yaw rate. The strategy of both the forward controller and feedback controller of tracking the desirable model is adopted...
The road-tire friction coefficient has important role in vehicle dynamic control systems like adaptive cruise control system (ACC), vehicle dynamic control (VDC), direct yaw-torque control system (DYC) etc. This paper introduces a new predictive methodology for the estimation of road-tire friction coefficient by using Dugoff tire model and the extended Kalman filter. At the same time, a simulation...
This paper proposes a chassis integrated control system theoretically utilizing SBW system by using 4WS method to improve vehicle handling and stability. With the application of integrated SBW and 4WS strategy, this paper investigates the effectiveness of the proposed control system in enhancing vehicle handling and stability. Based on the 7 DOF vehicle dynamic models, the paper have proposed integrated...
The paper sets up a simplified dynamic model for simulating the yaw/roll stability of heavy tractor-semitrailer using Matlab/Simulink. A linear quadratic regulator (LQR) based on partial-state feedback controller is used to optimize the roll stability of the vehicle. The control objective for optimizing roll stability is to be reducing the lateral load transfer rate while keeping the suspension angle...
The paper sets up a vehicle dynamic model which is used to determine rollover risk of heavy tractor-semitrailer under various driving conditions; therefore it can help the driver to react accordingly. Using this real-time dynamic model, the predictive time to rollover (PTR), which is decided by load transfer ratio (LTR) of trailer axle when it reaches its limit value, can be determined as the rollover...
The research developments and structural feature of electro-hydraulic brake (EHB) system were investigated. EHB and vehicle dynamic models were established and analyzed. The control strategy was accomplished for vehicle stability control with EHB system and verified by simulation in typical condition of steering under braking at low-friction condition. The simulation results show that the controller...
This paper presents a method of estimating vehicle states using an Unscented Kalman filter (UKF). The UKF developed estimates Vehicle motion, such as yaw rate and side slip angle, from the noisy measurement set. The vehicle state estimation using a non-linear vehicle model with Unitire tire model will be compared to the measured state which is subjected to the same tests, in order to validate the...
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