Coasting – Next Generation Start/Stop Systems

Müller, Norbert; Strauß, Steffen; Tumback, Stefan; Christ, Ansgar

doi:10.1365/s38313-011-0084-3

Cited by 6 publications

(2 citation statements)

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“…In addition to that, the sudden voltage spike seen across an inductive load when its supply voltage is suddenly reduced or removed will be possibly eliminated by the implementation of 'detached braking' (the driving motor is disengaged from the vehicle load and its rotor spins freely until friction slows it to a stop). Also, with the inclusion of clutch within a vehicle, a reduction in coasting loss can be realized by disengaging the driving motor from the vehicle load [6]. clutch is introduced into the driveline of the direct-drive propulsion system for the purpose of achieving a flexible connection between the motor and the hub.…”

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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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: 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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“…Muller et al [13] propose Stop/Start Coasting, that is, the Bosch concept, in which the fuel injection is turned off during the coasting; however, the combustion engine must be decoupled from the powertrain by opening the clutch or shifting into neutral gear in order to avoid negative engine torque during coasting. Disconnecting the engine from the powertrain, while turning off the fuel injection, prevents the engine from rotating.…”

Section: Introductionmentioning

confidence: 99%

Fuel Efficiency by Coasting in the Vehicle

Shakouri

Ordys

Darnell

et al. 2013

International Journal of Vehicular Technology

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This paper investigates the possibility of improving the fuel efficiency by decreasing the engine speed during the coasting phase of the vehicle. The proposed approach is stimulated by the fact that the engine losses increase with the engine speed. If the engine speed is retained low, the engine losses will be reduced and subsequently the tractive torque will be increased, enabling the vehicle to remain moving for longer duration while coasting. By increasing the time period of the coasting the fuel efficiency can be increased, especially travelling downhill, since it can benefit from the kinematic energy stored in the vehicle to continue coasting for a longer duration. It is already industry standard practice to cut fuel during coasting and refuel at low engine speed. The substantial difference proposed in this paper is the controlled reduction of engine speed during this phase and thus reduction in the engine losses, resulting in improved fuel economy. The simulation model is tested and the results illustrating an improvement to the fuel efficiency through the proposed method are presented. Some results of the experimental tests with a real vehicle through the proposed strategy are also presented in the paper.

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