scholarly journals Control Speed Ratio Electro-Hydraulic System of Continuously Variable Transmission (CVT) by Robust PI Controller

2013 ◽  
pp. 561-565 ◽  
Author(s):  
Sameh Bdran ◽  
Ma Shuyuan ◽  
Samo Saifullah ◽  
Jie Huang
Keyword(s):  
Hydraulic System ◽  
Pi Controller ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Variable Transmission

Research on Control Strategy and Experiment of Electronic Mechanical Continuously Variable Transmission

2011 ◽  
Vol 88-89 ◽  
pp. 191-196
Author(s):  
Lei Zhang ◽  
Yan Chun Zhai ◽  
Hai Xin Zhao ◽  
Guan Jin Chen
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Hydraulic System ◽  
Control Algorithm ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Manufacturing Cost ◽  
Speed Governor ◽  
Continuously Variable Transmissions ◽  
Variable Transmission

Nowadays, most of continuously variable transmissions (CVT) adopt hydraulic system to exert pressure on the cone-plate, in order to realize variable speed control. Electronic Mechanical Continuously Variable Transmission (EMCVT) studied in this paper, however, used rolling screw mechanism instead of the energy-hungry hydraulic system. Mechanical speed governor controlled by electro was adopted in EMCVT to regulate speed, which not only reduced the automobile’s fuel consumption, but also brought down the transmission’s manufacturing cost and failure rate obviously. Further study on the ratio control strategy of EMCVT was made and digital PID control algorithm with target ratio tracing was raised. Moreover, an improved PID control algorithm, that was integral separation and differential precession algorithm, was given. Platform experiment of EMCVT was finished, thus, the functionality and rationality of this transmission’s mechanical structure was proved, so was the feasibility and rationality of the speed ratio control strategy.

scholarly journals Real-Time Control Strategy for CVT-Based Hybrid Electric Vehicles Considering Drivability Constraints

2019 ◽  
Vol 9 (10) ◽  
pp. 2074 ◽  
Author(s):  
Hangyang Li ◽  
Yunshan Zhou ◽  
Huanjian Xiong ◽  
Bing Fu ◽  
Zhiliang Huang
Keyword(s):  
Real Time ◽  
Fuel Consumption ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Driving Pattern ◽  
Variable Transmission ◽  
Equivalent Factor ◽  
Hybrid Electric

The energy management strategy has a great influence on the fuel economy of hybrid electric vehicles, and the equivalent consumption minimization strategy (ECMS) has proved to be a useful tool for the real-time optimal control of Hybrid Electric Vehicles (HEVs). However, the adaptation of the equivalent factor poses a major challenge in order to obtain optimal fuel consumption as well as robustness to varying driving cycles. In this paper, an adaptive-ECMS based on driving pattern recognition (DPR) is established for hybrid electric vehicles with continuously variable transmission. The learning vector quantization (LVQ) neural network model was adopted for the on-line DPR algorithm. The influence of the battery state of charge (SOC) on the optimal equivalent factor was studied under different driving patterns. On this basis, a method of adaptation of the equivalent factor was proposed by considering the type of driving pattern and the battery SOC. Besides that, in order to enhance drivability, penalty terms were introduced to constrain frequent engine on/off events and large variations of the continuously variable transmission (CVT) speed ratio. Simulation results showed that the proposed method efficiently improved the equivalent fuel consumption with charge-sustaining operations and also took into account driving comfort.

Ratio Control Strategy for an Electromechanical Continuously Variable Transmission Based on Engine Models

2011 ◽  
Vol 291-294 ◽  
pp. 2861-2865 ◽  
Author(s):  
Qiang Jiang ◽  
Hong Yi Liu ◽  
Jian Jun Hao ◽  
Yue Cheng
Keyword(s):  
Pid Control ◽  
Control Algorithm ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Vehicle Speed ◽  
Working Models ◽  
Special Character ◽  
Variable Transmission ◽  
New Type ◽  
Dynamical Coupling

Electromechanical control CVT (EM-CVT) is a new type of continuously variable transmission, and its ratio quality is an important parameter validated the performance of vehicle. In order to study the dynamical coupling technology between EM-CVT and engine under the running state of vehicle, the special character of two working models is obtained by engine experiment; according to the principle of the EM-CVT, the relation between vehicle speed and ration is theoretically analyzed. Based on the basic theory of PID control, the improved PID control algorithm is proposed for the speed ratio control of the EM-CVT, and experimental verification is made. The experimental results show that there is a significant effect on the system with this algorithm.

Theoretical Model of Metal V-Belt Drives During Rapid Ratio Changing

1999 ◽  
Vol 123 (1) ◽  
pp. 111-117 ◽  
Author(s):  
G. Carbone ◽  
L. Mangialardi ◽  
G. Mantriota
Keyword(s):  
Theoretical Model ◽  
Continuously Variable Transmission ◽  
Transient Condition ◽  
Speed Ratio ◽  
Dynamical Response ◽  
Rapid Variation ◽  
Axial Thrust ◽  
Belt Drives ◽  
Ratio Speed ◽  
Variable Transmission

Today the use of metal V-belt (MVB) on C.V.T. (continuously variable transmission) based systems is the rule in automotive applications. The great advantage of this kind of belt is the capability to resist the moving half-pulley’s high axial thrust necessary to transmit the large torque involved. This paper suggest a theoretical model of belt’s behavior during rapid ratio speed changes with the aim to represent the dynamical response of the system during the transient condition. The paper proposes a relation which correlates some easily measurable macroscopic quantities: axial thrust, torque transmitted and belt’s tensions on the slack and tight side. The metal V-belt consists of wedge-shaped plates that are supported by a flexible band, of which there are two types: the metal V-belt without clearance and the metal V-belt with clearance between plates. Our investigation is carried out for the first type of belt and under the hypothesis that there is a rapid variation of speed ratio. The result, that has been reached, allows to predict the behavior of the system and simplifies the planning of continuously variable transmission with metal V-belt.

Design of Control System for Automotive CVT Based on ATmega164P MCU

2012 ◽  
Vol 479-481 ◽  
pp. 1897-1900
Author(s):  
Yue Cheng
Keyword(s):  
Control System ◽  
Force Control ◽  
Hydraulic System ◽  
Continuously Variable Transmission ◽  
Clamping Force ◽  
Single Chip ◽  
Rotating Speed ◽  
Position Signal ◽  
Single Chip Computer ◽  
Variable Transmission

Control system and some functional circuits of automotive CVT (Continuously Variable Transmission) based on ATmega164P single chip computer were introduced in this paper. Hydraulic system of the CVT was controlled according to the throttle position signal, oil pressure, rotating speed of the engine and transmission output speed etc. This system has achieved the clamping force control of the metal belt.

scholarly journals Adaptive PI Controller for Slip controlled Belt Continuously Variable Transmission

2018 ◽  
Vol 51 (4) ◽  
pp. 101-106
Author(s):  
Florian Verbelen ◽  
Michiel Haemers ◽  
Jasper De Viaene ◽  
Stijn Derammelaere ◽  
Kurt Stockman ◽  
...  
Keyword(s):  
Pi Controller ◽  
Continuously Variable Transmission ◽  
Variable Transmission

scholarly journals Intelligent Multiobjective Slip and Speed Ratio Control of a Novel Dual-Belt Continuously Variable Transmission for Automobiles

2014 ◽  
Vol 2014 ◽  
pp. 1-17
Author(s):  
Zhengchao Xie ◽  
Pak Kin Wong ◽  
Yueqiao Chen ◽  
Ka In Wong
Keyword(s):  
Analytical Model ◽  
Fuzzy Controller ◽  
Transmission Efficiency ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Rule Base ◽  
Passenger Cars ◽  
Variable Transmission ◽  
Torque Capacity ◽  
Low Torque

Van Doorne’s continuously variable transmission (CVT) is the most popular CVT design for automotive transmission, but it is only applicable to low-power passenger cars because of its low torque capacity. To overcome this limitation of traditional single-belt CVT, a novel dual-belt Van Doorne’s CVT (DBVCVT) system, which is applicable to heavy-duty vehicles, has been previously proposed by the authors. This paper, based on the published analytical model and test rig of DBVCVT, further proposes an intelligent multiobjective fuzzy controller for slip and speed ratio control of DBVCVT. The controller aims to safely control the clamping forces of both the primary and the secondary pulleys in order to improve the transmission efficiency, achieve the accurate speed ratio, and avoid the belt slip under different engine loads and vehicle speeds. The slip, speed ratio, and transmission efficiency dynamics of DBVCVT are firstly analyzed and modeled in this paper. With the aid of a flexible objective function, the analytical model, and fuzzy logic, a Pareto rule base for fuzzy controller is developed for multiobjective DBVCVT control. Experimental results show that the proposed controller for slip and speed ratio regulation of DBVCVT is effective and performs well under different user-defined weights.

scholarly journals Analysis of continuously variable transmission for flywheel energy storage systems in vehicular application

2014 ◽  
Vol 229 (2) ◽  
pp. 273-290 ◽  
Author(s):  
Aditya Dhand ◽  
Keith Pullen
Keyword(s):  
Energy Storage ◽  
High Speed ◽  
Power Flow ◽  
Mechanical Energy ◽  
Storage System ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Flywheel Energy Storage ◽  
Energy Storage Devices ◽  
Variable Transmission

Energy storage devices are an essential part of hybrid and electric vehicles. The most commonly used ones are batteries, ultra capacitors and high speed flywheels. Among these, the flywheel is the only device that keeps the energy stored in the same form as the moving vehicle, i.e. mechanical energy. In order to connect the flywheel with the vehicle drive line, a suitable means is needed which would allow the flywheel to vary its speed continuously, in other words a continuously variable transmission (CVT) is needed. To improve the efficiency and speed ratio range of the variators, a power spilt CVT (PSCVT) can be employed. This paper discusses the kinematics of PSCVT used to connect the flywheel to the driveline. A methodology describing the characteristic equations of speed ratio, power flow and efficiency of the PSCVT for various types including power recirculating and multi regime in both directions of power flow has been presented. An example of a PSCVT for a flywheel energy storage system (FESS) is computed using the derived equations and the results compared.

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