Research on Constant Speed Control Strategy of Water Medium Retarders for Heavy-Duty Vehicles

2019 ◽  
Author(s):  
Yulong Lei ◽  
Pengxiang Song ◽  
Yao Fu ◽  
Yuhai Wang ◽  
Yuchen Zhang
Keyword(s):  
Control Strategy ◽  
Speed Control ◽  
Constant Speed ◽  
Water Medium ◽  
Heavy Duty ◽  
Heavy Duty Vehicles

scholarly journals Design of a Road Friendly SAS System for Heavy-Duty Vehicles Based on a Fuzzy-Hybrid-ADD and GH-Control Strategy

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Jing Zhao ◽  
Pak Kin Wong ◽  
Zhengchao Xie ◽  
Xinbo Ma ◽  
Caiyang Wei
Keyword(s):  
Control Strategy ◽  
Fuzzy Controller ◽  
Numerical Results ◽  
Ride Quality ◽  
Heavy Duty ◽  
Vehicle Model ◽  
The Road ◽  
Overall Performance ◽  
Heavy Duty Vehicles ◽  
Semiactive Suspension

Semiactive suspension (SAS) system has been widely used for its outstanding performance in offering competent ride quality, road holding, and handling capacity. However, the road friendliness is also one of the crucial factors that should be attached in the design of the SAS system for heavy-duty vehicles. In this study, a fuzzy controlled hybrid-acceleration driven damper (ADD) and ground hook- (GH-) control strategy is proposed for SAS system of heavy-duty vehicles. Firstly, a quarter-vehicle model with SAS system is constructed. Then, aiming to improve the ride quality and road friendliness, a hybrid-ADD and GH-control strategy is proposed under the coordination of the fuzzy controller. Numerical results show that the ride quality and road friendliness of the SAS system with the proposed control strategy outperform those with traditional hybrid-sky hook and ground hook-control strategy. It is also verified that the proposed strategy is superior to the sole ADD approach and sole ground hook approach in improving the vehicle overall performance.

Designing the main controller of auxiliary braking systems for heavy-duty vehicles in nonemergency braking conditions

2017 ◽  
Vol 232 (9) ◽  
pp. 1605-1615 ◽  
Author(s):  
Hongpeng Zheng ◽  
Yulong Lei ◽  
Pengxiang Song
Keyword(s):  
Performance Testing ◽  
Water Medium ◽  
Heavy Duty ◽  
Control Logic ◽  
The Road ◽  
Braking System ◽  
New Type ◽  
Hydraulic Retarder ◽  
Braking Process ◽  
Heavy Duty Vehicles

With the development of the road industry, heavy-duty vehicles now require additional braking power to fulfill their braking requirements. Auxiliary braking systems, which include a hydraulic retarder and an engine brake, can provide additional braking force in nonemergency braking conditions. A water medium retarder is a new type of hydraulic retarder that can convert the kinetic energy of a vehicle into the thermal energy of coolant. This study introduces a novel auxiliary braking system involving a water medium retarder and an engine brake for heavy-duty vehicles. The specific forces of heavy-duty vehicles and the auxiliary braking system are established. The control logic of the novel auxiliary braking system is assigned, and a main controller is designed to dynamically manage the entire braking process. The main controller includes controllers A and B, which handles the engine brake and water medium retarder, respectively. The heavy-duty vehicles dynamic system model is created using MATLAB/Simulink. Upon performance testing, simulation results show that the designed main controller can effectively and rapidly manage the auxiliary braking system, thus satisfying the braking requirements in any nonemergency braking condition. Even when the slope of a road changes, the main controller can extract dynamical forces as well as acceleration parameters and fulfill the braking requirements of vehicles.

scholarly journals Dynamical Modeling of Frequency Controlled Variable Speed Parallel Multistage Centrifugal Pumps

2015 ◽  
Vol 62 (3) ◽  
pp. 347-362 ◽  
Author(s):  
Farid Khayatzadeh ◽  
Jafar Ghafouri
Keyword(s):  
Flow Rate ◽  
Control Strategy ◽  
Control Method ◽  
Speed Control ◽  
Constant Speed ◽  
Variable Step Size ◽  
Variable Speed ◽  
Centrifugal Pumps ◽  
Step Size ◽  
Pumping System

Abstract This paper presents a development of a model of a set of multistage centrifugal electro pumps including two 4 stage stainless steel centrifugal pumps, each coupled to a 4 kW three-phase induction motor, connected to a hydraulic application running under two control strategies including constant speed and variable speed methods. Each pump provides 16 m3/hr flow rate and 58mwater head at BEP (Best Efficiency Point). Dynamicity of the model causes variations in all operational parameters of pumping system in any variation on consuming flow rate. Each electro pump has been driven with a variable frequency drive utilizing frequency control method for adjusting the rotational speed under a PID control regarding to match of pumping system operational point with the consumption point to save the energy. 83% energy saving is achieved by model in variable speed control strategy comparing to constant speed control strategy. MATLAB/SIMULINK software using ode45 solver and variable step size simulates this model.

scholarly journals Safe and Ecological Speed Control for Heavy-Duty Vehicles on Long–Steep Downhill and Sharp-Curved Roads

2020 ◽  
Vol 12 (17) ◽  
pp. 6813
Author(s):  
Huifu Jiang ◽  
Wei Zhou ◽  
Chang Liu ◽  
Guosheng Zhang ◽  
Meng Hu
Keyword(s):  
Traffic Congestion ◽  
Load Transfer ◽  
Fuel Efficiency ◽  
Speed Control ◽  
Vehicle Body ◽  
Slip Angle ◽  
Heavy Duty ◽  
Speed Optimization ◽  
Near Future ◽  
Heavy Duty Vehicles

To contribute to the development of sustainable transport that is safe, eco-friendly, and efficient, this research proposed a safe and ecological speed control system for heavy-duty vehicles on long–steep downhill and sharp-curved roads under a partially connected vehicles environment consisting of connected heavy-duty vehicles (CHDVs) and conventional human-driven vehicles. This system prioritizes braking and lateral motion safety before improving fuel efficiency and ensuring traffic mobility at optimal status, and optimizes the speed trajectories of CHDVs to control the entire traffic. Speed optimization is modelled as an optimal control problem and solved by the iterative Pontryagin’s maximum principle algorithm. The simulation-based evaluation shows that the proposed system effectively reduces the peak temperature of the brake drums, the lateral slip angle of the vehicle wheels, and the lateral load transfer rate of the vehicle body; all these measurements of effectiveness are limited to safe ranges. A detailed investigation reveals that the proposed system reduces fuel consumption by up to 15.49% and inhibits the adverse effects on throughput. All benefits increase with the market penetration rate (MPR) of CHDVs and the traffic congestion level and reach significant levels under low MPRs of CHDVs. This indicates that the proposed system has good robustness for the impedance from conventional vehicles and could be implemented in the near future.

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