Shift control of a 2-speed dual clutch transmission for electric vehicle

Hong, Sungwha; Ahn, Sunghyun; Kim, Beakyou; Lee, Heera; Kim, Hyunsoo

doi:10.1109/vppc.2012.6422510

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…The second group are gear transmissions. Among the numerous solutions the Dual-Clutch [38] or planetary gear [39] systems seem to be particularly easy to adapt for electric drives. Their control systems for electric drives will be virtually the same as in the case of combustion drives to which they are dedicated.…”

Section: Discussionmentioning

confidence: 99%

The use of variable-speed mechanical transmission in electric drives

Hajduga

Kieracińska

2017

The Archives of Automotive Engineering – Archiwum Motoryzacji

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Pojazdy z napędem elektrycznym są dziś realną alternatywą dla pojazdów spalinowych. Pomimo ich niewątpliwych zalet istotną niedogodnością jest ich ograniczony zasięg jazdy, który silnie zależy od warunków eksploatacji. Celowe, zatem wydaje się dostosowanie konfiguracji napędu elektrycznego w taki sposób, aby bez względu na warunki eksploatacji napęd uzyskiwał możliwie wysokie sprawności, co wpłynie na zmniejszenie zużycia energii, bez konieczności zwiększania pojemności energetycznej baterii elektrochemicznej. W artykule przedstawiono wpływ zastosowania przekładni wielobiegowej na zużycie energii elektrycznej. Dzięki wyposażeniu napędu elektrycznego w przekładnie wielobiegową istnieje możliwość dopasowania parametrów pracy maszyny elektrycznej do warunków obciążenia w taki sposób, by sprawność jej pracy znajdowała się możliwie blisko obszaru najwyższej sprawności. W celu weryfikacji wpływu zastosowania dodatkowego elementu w układzie napędowym na zużycie energii przeprowadzono komputerowe badania symulacyjne. W badaniach porównano dwie struktury różniące się zastosowaną przekładnią, tj, w pierwszej konfiguracji zastosowano przekładnię o stałym przełożeniu zaś w drugiej konfiguracji przekładnię pozwalającą na wybór trzech przełożeń. Uzyskane na drodze symulacji komputerowych wyniki potwierdziły pozytywny wpływ przekładni wielobiegowej na zużycie energii zarówno w miejskich jak i pozamiejskich warunkach eksploatacji, przy czym w pierwszym przypadku zmniejszeni to było znaczące. Wskazuje to wyraźnie, że w przypadku pojazdów eksploatowanych w miastach korzystne jest zastosowanie napędu elektrycznego wyposażonego w przekładnię wielobiegową.

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Section: Discussionmentioning

confidence: 99%

The use of variable-speed mechanical transmission in electric drives

Hajduga

Kieracińska

2017

The Archives of Automotive Engineering – Archiwum Motoryzacji

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“…Sfarni et al (2008) reports about steeper cushion spring characteristic with wear. From a graph in Hong et al (2012) the normal force can be seen to be speed dependent. The speed dependency is said to be due to centrifugal forces acting on the diaphragm spring in Dolcini et al (2010).…”

Section: Clutch Variablesmentioning

confidence: 99%

Dry Clutch Modeling, Estimation, and Control

Myklebust

2014

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The graph on the cover is based on data from Figure 4 in Paper D. Actuator position, time, and clutch torque are on the axes and the coloring depends on the clutch disc temperature. The details are left as an exercise to the reader. The drawing in the background pictures a clutch disc.Typeset with L A T E X 2 ε Printed by LiU-Tryck, Linköping, Sweden 2014 "A mathematical model does not have to be exact; it just has to be close enough to provide better results than can be obtained by common sense." -Herbert A. Simon AbstractIncreasing demands on comfort, performance, and fuel efficiency in vehicles lead to more complex transmission solutions. One such solution is the Automated Manual Transmission (AMT). It works just like an ordinary manual transmission but the clutch and the gear selection are computer controlled. In this way high efficiency can be accomplished with increased comfort and performance. To be able to control and fully utilize an AMT, it is of great importance to have knowledge about how torque is transmitted in the clutch. The transmitted torque in a slipping dry clutch is therefore studied in a series of experiments with Heavy Duty Trucks (HDT). It is shown that material expansion with temperature can explain torque variations up to 900 Nm for the same clutch actuator position. A dynamic clutch temperature model that can describe the torque variations is developed. The dynamic model is validated in experiments, and shown to reduce the error in transmitted torque from 7 % to 3 % of the maximum engine torque compared to a static model. Since all modeling, parameter estimation, and validation are performed with production HDTs, i.e. production sensors only, it is straightforward to implement the model in a production HDT following the presented methodology.The clutch model is extended with lock-up/break-a-part dynamics and an extra state describing wear. The former is done using a state machine and the latter uses a slow random walk for a parameter corresponding to the thickness of the clutch disc. Two observability analyses are made: one with production sensors, and one with a torque sensor in addition to the production sensors. The analyses show that, in both cases, the temperature states and the wear state are observable both during slipping of the clutch and when it is fully closed. The latter is possible since a sensor measures the actuator position. The unknown offset in the torque sensor is possible to observe (at all times) if the model is further augmented with engine inertia dynamics. An Extended Kalman Filter (EKF) is developed and evaluated on measurement data for both cases. The estimated states converge from poor initial values, enabling prediction of the translation of the torque transmissibility curve and sensor offset. The computational complexity of the EKF is low and it is thus suitable for real-time applications.The clutch model is also integrated into a driveline model capable of capturing vehicle shuffle (longitudinal speed oscillations) and engine torque fluctuations. Parameter...

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“…As a result, the two-speed transmission scheme in the assembly of electric vehicles has become a hotspot. [1][2][3][4][5][6][7][8] Xi et al 9 designed a three-speed automatic manual transmission (AMT) with a planetary gear structure for electric buses in Beijing Olympic Games, improved the economy of the vehicle by 9%, and shortened the acceleration time from 0 to 50 km/h by 18% compared to the two-speed planetary gear transmission device. Then, Huang et al 10 developed a two-speed automatic transmission for electric vehicles, which reduced the requirements for maximum torque and maximum speed of the driving motor, optimized the working speed range of the motor, improved the driveline efficiency, and achieved a high shifting quality.…”

Section: Introductionmentioning

confidence: 99%

Forward design of the hydraulic system for the two-speed electric drive automatic transmission

Yue

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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The two-speed electric drive automatic transmission (2EDAT) is an effective scheme to improve the economy and power performance of electric vehicles. It is significant to carry out forward design, valve body improvement, and oil circuit optimization of the hydraulic system for 2EDAT. In the study, the functional requirement of 2EDAT hydraulic system was firstly analyzed and key parameters were calculated to determine the principle design of the hydraulic system. Then, the simulation model of the hydraulic system was established in the multidisciplinary dynamic simulation platform ITI-SimulationX and the changes in the pressure of the main oil circuit, the clutch oil pressure, and the cooling and lubrication flow in the shift process of the hydraulic system were simulated and analyzed. Furthermore, according to the principle scheme and constraint conditions of the whole machine, the overall layout and the hydraulic valve plate of the hydraulic system were designed and the valve plate and hydraulic system were tested on the bench. The test results of clutch pressure were 5.73%–13.12% lower than the designed value and did not meet the design requirements. Finally, according to test results, the processing defects of the pressure reducing valve were mitigated and the main oil circuit was optimized for another test of the valve plate and the hydraulic system. The test results of clutch pressure were 0.35%–8.60% higher than the designed value and met the design requirements. The results showed that the optimized hydraulic system realized the better control effects on the main oil pressure and clutch oil pressure in the shift process, including the fast and accurate clutch shift response, the sufficient cooling and lubrication flow, and smooth working conditions.

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Shift control of a 2-speed dual clutch transmission for electric vehicle

Cited by 18 publications

References 3 publications

The use of variable-speed mechanical transmission in electric drives

The use of variable-speed mechanical transmission in electric drives

Dry Clutch Modeling, Estimation, and Control

Forward design of the hydraulic system for the two-speed electric drive automatic transmission

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