Model based control for a pressure control type CVT

Ryu, Wansik; Nam, Juhyun; Lee, Young Hee; Kim, Hyunsoo

doi:10.1504/ijvd.2005.008470

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…Based on the difference between current ratio and the target ratio, the fuzzy controller calculates PWM (pulse width modulate) output, controlling the proportional valve in order to regulate the hydraulic cylinder to achieve the ratio control [14,15]. Without the addition of CVT sensors, the online fault diagnostic ways of model-based ratio control system is explored [16,17]. Firstly, the global and local output prediction models are developed based on the collection of data.…”

Section: Studying the Methods Of Cvt Fault Diagnosismentioning

confidence: 99%

Research on Fault Diagnostic System in CVT Based on UDS

Wang

Zhou

Quan

2014

Advances in Mechanical Engineering

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A communication model of diagnostic network and implementation of unified diagnostic services (UDS) based on controller area network (CAN) bus are presented in this paper, and fault diagnostic function of transmission control unit (TCU), USB-(universal serial bus-) CAN hardware and software modules, and fault diagnostic software based on personal computer (PC) are designed. Model diagnostic method is applied on ratio control, and fault diagnostic system is tested in vehicle.

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Section: Studying the Methods Of Cvt Fault Diagnosismentioning

confidence: 99%

Research on Fault Diagnostic System in CVT Based on UDS

Wang

Zhou

Quan

2014

Advances in Mechanical Engineering

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“…On the other hand, a pressure control system actively controls the primary clamping force, reducing belt slippage. Despite being an easier way of controlling the speed ratio, pressure control systems have not been widely implemented due to the accurate information required about the relation between primary thrust, torque and speed ratio [8]. Development of electronically controlled CVTs has pushed the research into pressure control systems into a wider prominence.…”

Section: Control Approachesmentioning

confidence: 99%

Model Based Pressure Control of a Push Belt Continuously Variable Transmission

Alzuwayer¹,

Singh²,

Muralidharan³

et al. 2016

MME

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A Continuously Variable Transmission (CVT) is a type of transmissions that provides a continuous range of speed ratios, thus it allows increasing the overall powertrain efficiency by running the engine at the optimal operating points. This paper investigates implementing a model based hydraulic pressure controller to achieve the desired CVT gear ratio. A map of desired gear ratios was estimated using the Optimal Operating Line (OOL) strategy, which minimizes the engine fuel consumption according to a defined cost function and a set of systems constraints. The controller was implemented in a complete vehicle model that includes driver, powertrain and road load models. The model was subjected to two different driving cycles and the results demonstrate the effectiveness of the control strategy and the pressure controller in keeping the engine at the most efficient operating regions.

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“…The contact pressure between the V-belt and the pulleys is also higher than the minimum pressure required, which further increases the wear. Decreasing the clamping force is then a solution to improve the transmission efficiency, but as mentioned, too low clamping force will lead to large slip value, and the system will become unstable [1][2][3]. Besides, it is noted that if the clamping force is increased to avoid the slip, the speed ratio must be changed slightly.…”

Section: Introductionmentioning

confidence: 99%

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

Xie

Wong

Chen

et al. 2014

Mathematical Problems in Engineering

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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.

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Model based control for a pressure control type CVT

Cited by 10 publications

References 3 publications

Research on Fault Diagnostic System in CVT Based on UDS

Research on Fault Diagnostic System in CVT Based on UDS

Model Based Pressure Control of a Push Belt Continuously Variable Transmission

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

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