Optimal idling speed control of direct-drive electric vehicle launch in consideration of drive comfort

Xiong, Ping; Gu, Chenglin

doi:10.1109/icems.2014.7013468

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…2. The initial speed when the clutch begins to be engaged to the driven side is given based on the fitted curves between the idle speed and the starting resistance force, and the relationship between them was investigated and optimized in [10]. Due to the limitation of the load capability, the negative acceleration of the load could potentially occur after clutch engagement at a fixed idle speed.…”

Section: Implementation Of Idle Speed Control With Armature Voltage Amentioning

confidence: 99%

“…Thus, a method using automatic voltage adjustment of driving motor during the clutch engagement is proposed, which is the supplement for the clutch start mode merely relying on the adjustment of idle speed in previous work [10]. Without considering the driver's intention, the track of armature voltage of the driving motor is automatically adjusted to produce a required torque and a smooth engagement at the time of clutch closure while the clutch is being engaged to the driven side.…”

Section: Introductionmentioning

confidence: 99%

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Research on torque compensation with optimal pedal throttle for direct-drive electric vehicle start-up

Xiong

2017

Teh. vjesn.

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Original scientific paper The original rigid connection between the motor and the hub is replaced with a flexible one using the clutch to connect the driving and driven sides of the driveline system. Then the paper proposes a separable process of motor start-up and load operation, based on which the scheme of idle speed control is studied. Focusing on the contradiction between the extended torque capacity and the reduced vehicle jerk merely by tuning the idle speeds, an improved solution is proposed for toque compensation by throttle adjustment during the clutch engagement. Furthermore, the method for tracking the armature voltage of the driving motor is investigated and optimized, aiming at the balance between the demanded transmitted torque and the jerk level during the starting process. Finally, effectively enhanced torque capacity of the driving motor for the vehicle start-up on the premise of the improved comfort level has been demonstrated by experiments. Keywords: armature voltage compensation; direct-drive; flexible coupling; idle speed; vehicle jerkIstraživanje kompenzacije zakretnog momenta s optimalnom prigušnicom pedale za pokretanje električnog vozila izravnog stupnja prijenosa Izvorni znanstveni članak Originalna kruta veza između motora i glavine zamijenjena je fleksibilnom uporabom spojke za povezivanje pogonskog i gonjenog vratila sustava prijenosa. U radu se zatim predstavlja odvojeni proces pokretanja i opterećenja motora na osnovu kojega se analizira shema reguliranja rada motora u praznom hodu. Fokusiranjem na probleme koordinacije povećanog kapaciteta zakretnog momenta i smanjenja trzaja automobila samo regulacijom rada motora u praznom hodu, predlaže se poboljšano rješenje kompenzacije zakretnog momenta podešavanjem napona rotora dok se spojka aktivira gonjenom stranom. Nadalje, ispituje se i optimizira metoda za označavanje napona zakretnog momenta s ciljem stvaranja balansa između traženog prijenosnog mehanizma zakretnog momenta i jačine trzaja tijekom pokretanja vozila. Konačno, eksperimentima je demonstriran učinkovito poboljšani učinak zakretnog momenta pogonskog motora kod pokretanja vozila u svrhu povećane udobnosti.Ključne riječi: elastična spojka; izravni prijenos; kompenzacija napona rotora; rad motora u praznom hodu; trzaj vozila

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Section: Implementation Of Idle Speed Control With Armature Voltage Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on torque compensation with optimal pedal throttle for direct-drive electric vehicle start-up

Xiong

2017

Teh. vjesn.

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“…The high starting current could accelerate ageing of the battery and decrease the battery life. Moreover, when the hub motor works in the braking situation, the high counter electromotive force may damage the control system [7]. Besides that, when drivers do emergency start or emergency shutdown, the rotate speed fluctuation of the hub motor directly reflects the vehicle speed.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the experiments of the clutch engagement were implemented to solve the problems in another method. Through the optimised idle speed control strategy, the electromagnetic impact could decrease by 67% and the comfort level is doubled than direct starting up without a clutch [7, 9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a novel clutch system for in‐wheel motor drive electric vehicles

2017

IET Electric Power Applications

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In-wheel motor drive electric vehicles mainly adopt fastening connection between hub and motor, so the electromagnetic impact and the mechanical impact are inevitable. The electromagnetic impact endangers the battery and the control system and the mechanical impact brings bad driving experience. Newly designed bistable electromagnetic clutches are embedded into the hub motor to realise flexible connection and avoid the impact. The goal of this study is to analyse the dynamic movement process of the clutch in order to achieve reliable torque transmission. The dynamic differential equations of the clutch coupled with the pulse power supply are presented. By using the dynamic analysis, the critical situation of the engagement is discussed and the engagement speed requirement equation is provided. The displacement curves and the acceleration curves validate the dynamic analysis and the engagement experiment verifies the reliability of the whole clutch system.

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“…The simulation and experimental results of a conventional clutch between motor and load presented in [12,13] show that the starting current and jerk in clutch coupling starts under different idle speeds can be reduced to less than 1/2 compared to direct starting, and the impulsive back electromotive force to the controller can be eliminated by detached braking (the motor stops naturally after being disconnected from the braking load). Besides, in hybrid EVs, the conventional clutch has been used to cut off the engine or electrical machine while idling to avoid spin losses and extend the life cycle of the machine [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a Permanent Magnet Bi-Stable Electro-Magnetic Clutch Unit for In-Wheel Electric Vehicle Drives

Cai

2015

Energies

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Abstract:Clutches have been used in internal combustion vehicles and concentrated electric vehicles (EVs) to smoothen impulsion while starting and shifting. This paper proposes a permanent magnet bi-stable electromagnetic clutch unit (PMBECU) which is specially introduced into in-wheel EVs to make the rigid connection between hub and wheel more flexible. Firstly, the operation principle of the PMBECU is illustrated. Then, the basic magnetic circuit model is presented and analyzed, followed by optimal design of the main structural parameters by investigating the PM leakage flux coefficient. Further, according to the basic electromagnetic characteristics of the PMBECU, the current pulse supply is put forward, and the minimum pulse width which enables the operation of the PMBECU and its dynamic characteristics are analyzed by an improved finite element method. Finally, a prototype machine is manufactured and tested to validate all the analysis results.

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Optimal idling speed control of direct-drive electric vehicle launch in consideration of drive comfort

Cited by 4 publications

References 7 publications

Research on torque compensation with optimal pedal throttle for direct-drive electric vehicle start-up

Research on torque compensation with optimal pedal throttle for direct-drive electric vehicle start-up

Dynamic analysis of a novel clutch system for in‐wheel motor drive electric vehicles

Analysis and Design of a Permanent Magnet Bi-Stable Electro-Magnetic Clutch Unit for In-Wheel Electric Vehicle Drives

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