Chuanxue Song

Study on the Composite ABS Control of Vehicles with Four Electric Wheels

Proposed a composite ABS control method for vehicles with four electric wheels, and simulated the method. By analyzing the characteristic curves of the four in-wheel electric motors, and some typical braking force distribution methods of composite braking for EV, a braking force distribution method for four-electric-wheel EV is presented. The method combined the ideal braking force distribution curve, and considered the ECE braking regulations, so it can guarantee both the braking stability and the energy recovery. Furthermore, a composite ABS control method was proposed base on the braking force distribution method. The composite ABS control method is a control method that the electric motor ABS control works together with the hydraulic ABS control. Both of the two modes of ABS control logic were using logic threshold control method. The model of the electric-wheel vehicle were established with AMESim, and the model of the composite ABS controller were built with Simulink. Co-simulation were carried out. Through analysis, a number of parameters curves were obtained. It proves that the composite ABS control method for four-wheel electric vehicles can effectively control the slip rate, and ensure braking stability.

Modeling and Simulation of Automotive Four-Channel Hydraulic ABS Based on AMESim and Simulink/Stateflow

Four-wheel automobile co-simulation model with AMESim and Simulink/Stateflow was established. Vehicle model was established with AMESim. Also, using AMESim we established a four-channel hydraulic system including ABS hydraulic modulator. The ABS controller model was established with Simulink/Stateflow. Co-simulation model simulates the vehicle braking performance on low adhesion road. Simulation result shows that ABS controller can effectively improve the vehicles braking stability and performance. Therefore, the simulation method can be used in developing ABS system in the future.

Evaluation of Influence of Motorized Wheels on Contact Force and Comfort for Electric Vehicle

Volatile oil prices and increased environmental sensitivity together with political concerns have moved the attention of governments, automobile manufacturers and customers to alternative power trains. From the actual point of view the most promising concepts for future passenger cars are based on the conversion of electrical into mechanical energy. In-wheel motors are an interesting concept towards vehicle electrification that provides also high potentials to improve vehicle dynamics and handling. Nevertheless in-wheel motors increase the unsprung mass worsening vehicle comfort and safety. All kinds of motorized-wheel structures are analyzed. For the unitary motorized wheel, since increasing the unsprung mass of vehicle, it adds adverse effects on the vehicle road holding performance and vehicle comfortableness. To decrease the adverse effect for unsprung mass increasing, a method by attaching the motor in the wheel through springs and dampers of exclusive use is brought out. It is verified that the vibration of EV with suspended-motor motorized-wheel is better than the EV with detached-motorized wheel. For high cost of suspended in-wheel motor, The effect of increasing of unsprung mass by using integral motor is analyzed by simulation with whole vehicle model. The more unsprung mass of integral motor deteriorates the vehicle comfort and vibration performance at low excitation frequency of road. But it is improved by using integral motor at higher excitation frequency of road, while unsprung mass is increased by using integral motor. The fluctuation amplitude of vibration at high frequency is much more big than at low frequency. In this view, the conclusion that in-wheel motor integrated into wheels is acceptable structural concept for electric vehicle with motorized wheels with lower cost than suspended in-wheel motor is achieved

Research on Vehicle Electronic Stability Control Method

Electronic stability control system (ESC) is one of the advanced active safety technology for modern vehicles. The active yaw-moment control (AYC) is one of the most important parts of ESC to enhance vehicle active safety. The control method with combination of logic threshold and PID method is brought out. The PID parameters are generated by logic threshold method through the controller adjusting parameters. The wheel brake torque to keep vehicle stable is calculated by PD controller. The self-correcting threshold of PD control algorithm has the merit of decreasing calculation processes and increasing computation speed. The results of simulation show that the proposed algorithm can be used to control the vehicle more stably under various conditions.

A Composite ABS Control Method for EV with Four Independently-Driving Wheels

A new composite ABS control method for EV with four independently-driving wheels is presented. Combinating the best braking energy recovery strategy and the ideal braking force distribution control strategy, we designed a new strategy of braking force distribution for EV with four independently-driving wheels, and proposed a new composite ABS control method based on cooperative work of electric motor ABS and hydraulic ABS. A co-simulation model was built with AMESim and Simulink/Stateflow, and simulation was carried out. Simulation result indicates that the new control method can satisfy the braking requirements and improve the braking stability, and it could be a developing direction of EV ABS system.

Controll algorithm of combination with logic gate and PID control for vehicle electronic stability control

the electronic stability control system is one of most advanced active safety technology for modern vehicles. It enhances vehicle active safety effectively. The control algorithm of combination with logic gate and PID control is brought out. The PID parameters are produced by logic gate control and the wheel brake torque to keep vehicle stabilization is outputted by PID method. The method possess of the merit of decreasing computation process and increasing computation speed. Simulation results show that the proposed control algorithm can be used to control the vehicle more stably under various conditions.

Influence of In-Wheel Motor Structure about the Contact and Comfort for Electric Vehicle

All kinds of motorized-wheel structures are analyzed. For the unitary motorized wheel, since increasing the unsprung mass of vehicle, it adds adverse effects on the vehicle road holding performance and vehicle comfortableness. To decrease the adverse effect for unsprung mass increasing, a method by attaching the motor in the wheel through springs and dampers of exclusive use is brought out. It is verified that the vibration of EV with suspended-motor motorized-wheel is as well as the EV with detached-motorized wheel.

Development of CAN Card Driver Module Using S-Function in xPC Target

With xPC Target we can convert a PC compatible computer into a real-time system and build a hardware in-loop test bench of ESP system based on CAN bus technology. It will be more convenient and faster than traditional way. Since there is not a drive module of CAN PCI-1680U which could be invoked directly in xPC Target, by using S-function, the article compiled a drive module which can be invoked in xPC Target and used in ESP hardware-in-loop test bench, and achieved the CAN telecommunication between ECU and sensors.