A novel magneto-rheological fluid dual-clutch design for two-speed transmission of electric vehicles

Zhang, Huan; Du, Haiping; Sun, Shuaishuai; Zhao, Jin; Ning, Donghong; Li, Weihua; Wang, Yafei

doi:10.1088/1361-665x/ac0674

Cited by 8 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MRF valves can achieve extremely fast on/off switching through applying/removing external electromagnetic field, but they are always accompanied by a pressure drop about 4 MPa and their nominal flow rate is rather small (<8 l min −1 ) [13,[16][17][18], which are more suitable for use as damping elements in mechanical systems. The shear mode of MRF, which can achieve high torque transmission has been applied to vehicle clutches [19,20]. This mode also provides new insights for enhancing the performance of high-speed on/off valve actuators.…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of high-speed on/off valve based on energy-coupled actuator

Dai,

Yang,

Xiong

2024

Smart Mater. Struct.

View full text Add to dashboard Cite

The development digital hydraulics demands higher performance on high-speed on/off valves. In order to fully exploit the energy saving advantages of digital hydraulics, advanced high-speed valves are expected to possess a fast response and a large nominal flow rate simultaneously. Energy-coupled-actuator (ECA) utilizes the shear working mode of magnetic rheological fluid (MRF) to achieve reciprocating motion of the valve spool through the coupling/decoupling of a pair of disks and a translational piece and its driving force is not affected by the valve spool’s position. The reported advantages of ECA meets the design requirements of actuators for high-speed on/off valve. This study gives the detailed design proposal of high-speed valve based on ECA (ECAV). The work also established a multi-physics coupled model for ECAV, calculated the key parameters of the valve driving system, and predicted the switching performance of ECAV. Finally, a prototype of ECAV with updated sealing solution between the actuator and valve block was fabricated and experimental tested. The results indicate that for current ECAV prototype successfully established 40L/min@5bar (1.5mm stroke) using response time less than 7ms. Moreover, the prototype only consumed 14ms to reach a long stroke of 5mm with a significantly increased ratio of stroke over response time.

show abstract

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of high-speed on/off valve based on energy-coupled actuator

Dai,

Yang,

Xiong

2024

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…In 1948, Rabinow [1] invented a smart material called magnetorheological fluids (MRFs hereinafter), which consists of advantages, MRF has broad applications in fields such as vehicles [2][3][4], polishing [5][6][7][8], vibration isolation [9][10][11], mechanical transmission [12], military, and aerospace [13].…”

Section: Introductionmentioning

confidence: 99%

A capacitive method and experiment for measurement of sedimentation of magnetorheological fluid

Xie,

Li,

Yang

et al. 2023

Smart Mater. Struct.

View full text Add to dashboard Cite

Sedimentation is one of the key issues in the practical engineering applications of magnetorheological fluids (MRFs). Testing and evaluation of the suspension stability of MRFs should be a prerequisite procedure before their applications. There are a few reported methods of measurement of sedimentation of MRFs. The opaque zone below the mudline, especially the sediment zone at the bottom in the MRF column, is the true key factor that affects the applications of MRF due to the possible irreversibility caused by the caking of the sediment zone. This study proposes a novel capacitive method on the basis of the change in dielectric constant resulting from the change in concentration of the magnetic metal particles of MRF upon sedimentation. First, an analytic model was established to present a positive correlation between the dielectric constant and volume fraction of particles throughout the entire MRF column and the theoretical expression of the dielectric constant of MRF in a test tube was obtained. Second, a capacitive sensor and the relevant experimental set-up were designed and fabricated. Especially, the effect of eccentricity error of the capacitor sensor structure on the measuremnt was analyzed. Then, a sedimentation experiment for prepared MRF samples was carried out, and the testing results were discussed and verified by a visual mudline observation of the supernatant zone, indicating the feasibility of testing and evaluating the suspension stability of MRF by the capacitive method.

show abstract

“…Under the action of no external magnetic field, the MRF behaves as a Newtonian fluid. In contrast, the MRF changes from free flow without a magnetic field to solid-like flow, showing the characteristics of Bingham fluid with high viscosity, under the action of the external magnetic field [19,20]. Therefore, MRFT technology has the advantages of both easy and stepless speed ratio regulation, simple control, fast response, and small volume [21].…”

Section: Introductionmentioning

confidence: 99%

A Driving-Adapt Strategy for the Electric Vehicle with Magneto-Rheological Fluid Transmission Considering the Powertrain Characteristics

Liao

Ning

Wang

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

The additional energy consumption caused by the incompatibility between existing electric vehicle (EV) powertrain characteristics and driving conditions inevitably curbs the promotion and development of EVs. Hence, there is an urgent demand for the driving-adapt strategy, which aims to minimize EV energy consumption due to both powertrain characteristics and driving conditions. In order to fully explore the EV driving-adapt potential, this paper equips the EV with a magneto-rheological fluid transmission (MRFT). First, an EV dynamics analysis of the driving conditions, the powertrain model considering the energy transmission process, and the driving-adapt transmission model considering magneto-rheological fluid (MRF) is conducted to clarify the quantitative relation between the driving conditions and the powertrain. Second, a driving-adapt optimization strategy in the specific driving condition is proposed. Finally, the results and discussions are executed to study (i) the determination of the MRFT fixed speed ratio and variable speed ratio range, (ii) the application potential analysis of the proposed strategy, and (iii) the feasibility analysis of the proposed strategy. The results indicate that (i) the urban driving condition has higher requirements for the MRFT, (ii) EVs equipped with MRFT achieve the expected driving performance at the most states of charge (SOCs) and environmental temperatures, except for the SOC lower than 10%, and (iii) the driving time with efficiency greater than 80% can be increased by the MRFT from 10.1% to 58.7% and from 66.8% to 88.8% in the urban and suburban driving conditions, respectively. Thus, the proposed driving-adapt strategy for the EV equipped with the MRFT has the potential to alleviate or eliminate the traffic problems caused by the incompatibility of the EV powertrain characteristics and the driving conditions.

show abstract

A novel magneto-rheological fluid dual-clutch design for two-speed transmission of electric vehicles

Cited by 8 publications

References 38 publications

Design and performance analysis of high-speed on/off valve based on energy-coupled actuator

Design and performance analysis of high-speed on/off valve based on energy-coupled actuator

A capacitive method and experiment for measurement of sedimentation of magnetorheological fluid

A Driving-Adapt Strategy for the Electric Vehicle with Magneto-Rheological Fluid Transmission Considering the Powertrain Characteristics

Contact Info

Product

Resources

About