Down shift control with power of planetary-type automatic transmission for a heavy-duty vehicle

Wang, Erlie; Meng, Fei

doi:10.1016/j.ymssp.2021.107828

Cited by 15 publications

(3 citation statements)

References 22 publications

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“…Therefore, in order to maintain a stable output speed before and after shifting, the input speed should logically decrease regularly. Power on downshift usually occurs when climbing a hill or resistance increasing 19 , the changes of speed and transmission ratio are shown in the Fig. 2 b.…”

Section: Shifting Process Analysismentioning

confidence: 99%

Research on shifting process control of automatic transmission

Zou

Wang

Zhong

et al. 2022

Sci Rep

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The shift quality of an automatic transmission directly affects the human-perceived comfort and the durability of the automatic transmission. In general, the inconsistency caused by manufacturing errors, life-cycle changes, or other changes in hydraulic characteristics are the main reason affecting the shift quality, which should be compensated by adaptive control in the shifting process. In this paper, we first provide an in-depth analysis of the relationship between proportional solenoid current, clutch pressure, speed and torque in the shifting process control. Then we propose two efficient adaptive control strategies for the torque phase and inertia phase, respectively. Both algorithms are tested and verified on a riot utility vehicle. The experimental results indicate that the adaptive control strategies proposed in this paper can effectively compensate the engine flare and the clutch tie-up of the torque phase, and keep the inertia phase within a proper time range.

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Section: Shifting Process Analysismentioning

confidence: 99%

Research on shifting process control of automatic transmission

Zou

Wang

Zhong

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Meanwhile, to guarantee the normal operation of transmission, the assessment of the vehicle transmission performance is necessary [2,3] and performance improvement will be achieved nally. With the help of the rotating parts, such as gears, shafts, and bearings, tracked vehicle transmission could realize di erent functions, such as straight driving, steering, and braking [4]. In the process of vehicle power transmission, power loss is inevitable.…”

Section: Introductionmentioning

confidence: 99%

An Approach for Performance Assessment of Tracked Vehicle Transmission Based on the Median-Rank Weight and the Least-Square Support Vector Machine

Zou

Zhang

Yan

et al. 2022

Mathematical Problems in Engineering

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Transmission efficiency is one of the important indicators for the performance assessment of the tracked vehicle transmission device. Considering the influence of many factors in the transmission process at the straight driving mode, an approach for constructing the normalized comprehensive performance assessment indicator is proposed based on the median rank of no-load power loss and the median rank of transmission efficiency. Then, the performance assessment of the single tracked vehicle transmission device is performed with the least-square support vector machine (LSSVM). The results show that the stable comprehensive performance assessment indicator could be obtained in the first 10 speed measurement points, and the performance state of the vehicle transmission device is identified according to the criterion.

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“…In Ref. [12]- [13], a dual-motor powertrain coupled with a planetary gear or a shaft-fixed gear unit is presented. Its mode switching relies on the exact action of two clutches and a synchronizer sleeve.…”

Section: Introductionmentioning

confidence: 99%

Gearshift Control in Engagement Process of Dual-Motor Coaxial Propulsion System for Electric Bus

Lin

et al. 2022

IEEE Access

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Considering single-motor drive system cannot meet the requirements of high-performance electric buses for Beijing Winter Olympics, a dual-motor coaxial propulsion system based on single planet gear set is developed. At the same time, a shift control method based on hierarchical linear quadratic regulator (HLQR) algorithm is designed to improve the poor shift quality caused by the rapid change of output shaft speed in the shift process. In this method, the upper controller adopts robust tracking linear quadratic regulator algorithm to control the speed change rate of the output shaft in the process of gear shifting, so as to reduce the load of gear shifting actuator in the process of gear shifting; the lower controller adopts disturbance suppression linear quadratic regulator algorithm to control the shifting force and improve the adaptability of the system to disturbance conditions Through simulation analysis, the performances of hierarchical linear quadratic regulator algorithm, optimal control algorithm based on variational method and PI algorithm in the process of gear shifting were comparatively analyzed. Simulation results showed that the hierarchical linear quadratic regulator algorithm exhibited a better performance in gear control than the other two algorithms. In addition, a large number of bench test results also proved that compared with PI algorithm, hierarchical linear quadratic regulator algorithm reduced vehicle impact by 19.17% and reduced the shift force by 32.48% in the sacrifice of shift time by 5.03%.

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Down shift control with power of planetary-type automatic transmission for a heavy-duty vehicle

Cited by 15 publications

References 22 publications

Research on shifting process control of automatic transmission

Research on shifting process control of automatic transmission

An Approach for Performance Assessment of Tracked Vehicle Transmission Based on the Median-Rank Weight and the Least-Square Support Vector Machine

Gearshift Control in Engagement Process of Dual-Motor Coaxial Propulsion System for Electric Bus

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