Shift characteristics of a bilateral Harpoon-shift synchronizer for electric vehicles equipped with clutchless AMTs

Mo, Wenwei; Wu, Jinglai; Walker, Paul; Zhang, Nong

doi:10.1016/j.ymssp.2020.107166

Cited by 16 publications

(14 citation statements)

References 40 publications

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“…-Shifting mechanism was not explained in details. The latest works related to gearshifting mechanism and its control are described in [41][42][43][44][45][46][47][48][49][50]. Researchers in [41][42][43] argued that criteria for the EV motor to operate efficiently is not just the application of the multispeed discrete transmission but also smooth gearshifting process with minimum jerking and actuation power usage.…”

Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

“…The latest works related to gearshifting mechanism and its control are described in [41][42][43][44][45][46][47][48][49][50]. Researchers in [41][42][43] argued that criteria for the EV motor to operate efficiently is not just the application of the multispeed discrete transmission but also smooth gearshifting process with minimum jerking and actuation power usage. Reference [44], on the other hand, explained jerking effects in relation to friction clutch, one-way clutch and types of the driveline.…”

Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

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Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

et al. 2022

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Electric vehicles (EV) are quickly gaining a foothold in global markets due to their zero tailpipe emissions and increasing practicality in terms of battery technologies. However, even though EV powertrains emit zero emissions during driving, their efficiency has not been fully optimized, particularly due the commonly used single-speed transmission. Hence, this paper provides an extensive review on the latest works carried out to optimize the power flow in EV powertrains using multispeed discrete transmission, continuously variable transmission and multi-motor configurations. The relevant literatures were shortlisted using a keyword search related to EV powertrain in the ScienceDirect and Scopus databases. The review focused on the related literatures published from 2018 onwards. The publications were reviewed in terms of the methodologies applied to optimize the powertrain for efficiency and driving performance. Next, the significant findings from these literatures were discussed and compared. Finally, based on the review, several future key research areas in EV powertrain efficiency and performance are highlighted.

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Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

et al. 2022

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“…The AMT dynamic model under neutral gear position is shown in Figure 1. The dynamic equation of AMT dynamic model under neutral gear position can be expressed as Equation (1) 𝑀𝑋 ̇+ 𝐶𝑋 = 𝐹 (1) where 𝑀 is the mass matrix expressed as 𝑀 = [𝐽 𝑖 𝐽 𝑜 ] 𝑇 , 𝑋 is the velocity matrix expressed as 𝑋 = [𝜔 𝑖 𝜔 𝑜 ] 𝑇 , 𝐶 is damping matrix expressed as 𝐶 = [𝐶 𝑖 𝐶 𝑜 ] 𝑇 , and 𝐹 is force matrix expressed as 𝐹 = [𝑇 𝑖 𝑇 𝑜 ] 𝑇 . The main parameters of Equation ( 1) are listed in Table 1.…”

Section: Amt Dynamic Analysismentioning

confidence: 99%

“…Synchronizers are widely used in cars and light-duty vehicles to improve shifting quality and reduce shifting time [1,2]. However, they cannot be widely used in heavyduty vehicles limited by manufacturing technology and the strength of materials [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

2021

Processes

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A countershaft brake is used as a transmission brake (TB) to realize synchronous shifting by reducing the automated mechanical transmission (AMT) input shaft’s speed rapidly. This process is performed to reduce shifting time and improve shifting quality for heavy-duty vehicles equipped with AMT without synchronizer. To improve controlled synchronous shifting, the AMT input shaft’s equivalent resistance torque and the TB’s characteristic parameters are studied. An AMT dynamic model under neutral gear position is analyzed during the synchronous control interval. A dynamic model of the countershaft brake is discussed, and its control flow is given. The parameter identification method of the AMT input shaft’s equivalent resistance torque is given on the basis of the least squares algorithm. The parameter identification of the TB’s characteristic parameters is proposed on the basis of the recursive least squares method (RLSM). Experimental results show that the recursive estimations of the TB’s characteristic parameters under different duty cycles of the TB solenoid valve, including brake torque estimation, estimation accuracy, and braking intensity estimation, can be effectively estimated. The research provides some reliable evidence to further study the synchronous shifting control schedule for heavy-duty vehicles with AMT.

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“…The effectiveness of the control algorithm was verified through a shift experiment. In [29], motor active synchronization technology, based on a PID algorithm, was used to assist in the engagement of the synchronizer. At present, there have been few studies that considered the stability and rapidity of the control algorithm in motor active synchronization technology.…”

Section: Introductionmentioning

confidence: 99%

Gear Shift Coordinated Control Strategy Based on Motor Rotary Velocity Regulation for a Novel Hybrid Electric Vehicle

et al. 2021

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This paper proposes a novel hybrid power system to improve the shift quality of a hybrid electric vehicle (HEV). After selecting a typical shift scheme, the study focused on the motor rotary velocity control algorithm and coordinated control strategy for the motor and clutch. The effects of various control algorithms on different target rotary velocities were analyzed, and a proportional-integral-derivative (PID)–bang-bang–fuzzy compound intelligent algorithm for a motor rotary velocity control system was investigated. In addition, to address the problems of the long synchronizing time required for the rotary velocity and large sliding friction work, which affect the shift quality during the process of engaging the clutch, a coordinated control strategy for the motor rotary velocity and clutch oil pressure was investigated. The research results showed that, compared with a gear shift coordinated control strategy based on a PID control algorithm, the strategy based on the PID–bang-bang–fuzzy compound intelligent control algorithm proposed here reduced the shift time and clutch slipping friction work by 35.7% and 19.2%, respectively.

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Shift characteristics of a bilateral Harpoon-shift synchronizer for electric vehicles equipped with clutchless AMTs

Cited by 16 publications

References 40 publications

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

Gear Shift Coordinated Control Strategy Based on Motor Rotary Velocity Regulation for a Novel Hybrid Electric Vehicle

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