Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Oglieve, Callum; Mohammadpour, Mahdi; Rahnejat, Homer

doi:10.1177/0954407017702985

Cited by 41 publications

(44 citation statements)

References 14 publications

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“…The presented shifting strategy employed by Oglieve et al [12] to validate the model against the NEDC model was to shift at a fixed engine speed of 2450 rpm using the original transmission and a 5-speed gearbox. The two shifting strategies applied in current simulations examine, for each given time step, all combinations of gear and CVT speed ratios as well as bypassing the CVT straight to the 5 speed gearbox via a clutch mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…The original 5 speed gearbox in [12] was used as a baseline to compare what improvement other systems could gain in fuel economy and NOx emissions. The shifting strategy was to minimise the fuel consumption, this was done by calculating the fuel consumption for each gear and selecting the gear with the lowest fuel but within engine torque and speed constraints such as redline and keeping above a minimum engine speed.…”

Section: Optimising 5-speed and 6-speed Transmissionsmentioning

confidence: 99%

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Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Walker

Huerta

Oglieve

et al. 2019

IJPT

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Fuel economy is a growing concern for both manufacturers within the automotive sector and consumers. Increasing government legislation is driving towards greener vehicles with reduced CO2 and NOx emissions and greater fuel economy, especially within urban environments. Manufacturers use new technologies in their powertrain systems to tackle these problems. This paper simulates and evaluates the performance of using a half toroidal CVT in series with a conventional multi-speed transmission, by analysing different shifting strategies to optimise fuel consumption and NOx emissions over the NEDC using this novel approach. The results show an 8.83% increase in fuel economy and up to an 11.34% reduction in NOx emissions is possible using this arrangement. The introduction of CVT adds a further 1.18% increase in fuel economy and 3.59% decrease in NOx emissions. The paper concludes that this novel arrangement should be considered by automotive manufacturers as a solution for improvements to powertrain technology.

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Section: Resultsmentioning

confidence: 99%

Section: Optimising 5-speed and 6-speed Transmissionsmentioning

confidence: 99%

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Walker

Huerta

Oglieve

et al. 2019

IJPT

Self Cite

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“…The efficiency (η) of the gearbox can be calculated from the power flow. The expression is represented 34 as equation (14), where τ ik is torque of driver gear, ω ik is angular velocity of the driver gear and ω ok is angular velocity of driven gear at k-th stage. It has been determined from the analysis that the power efficiency value for gear ratio 3.46 is 97.5 %.…”

Section: Power Flow Analysis and Efficiency Calculationmentioning

confidence: 99%

“…The efficiency (Z) of the gearbox can be calculated from the power flow. The expression is represented 34 as equation 14, where ik is torque of driver gear, ! ik is angular velocity of the driver gear and !…”

Section: Power Flow Analysis and Efficiency Calculationmentioning

confidence: 99%

A heuristic synthesis of multistage planetary gearbox layout for automotive transmission

Bhattacharjee

Bhola

Dan

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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The automatic transmission system is very crucial for the high-speed vehicles, where the planetary or epicyclic gearbox is a standard feature. With the increase in design intricacies of planetary gearbox, mathematical modelling has become complex in nature and therefore there is a need for modelling of multistage planetary gearbox including the shifting scheme. A random search-based synthesis of three degrees of freedom (DOF) high-speed planetary gearbox has been presented in this paper, which derives an efficient gear shifting mechanism through designing the transmission schematic of eight speed gearboxes compounded with four planetary gear sets. Furthermore, with the help of lever analogy, the transmission power flow and relative power efficiency have been determined to analyse the gearbox design. A simulation-based testing and validation have been performed which show the proposed model is efficient and produces satisfactory shift quality through better torque characteristics while shifting the gears. A new heuristic method to determine suitable compounding arrangement, based on mechanism enumeration, for designing a gearbox layout is proposed here. An important finding on automotive gear shift quality due to closer gear ratio is also reported in this work.

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“…Moreover, new technologies for automated manual transmission (AMT) have been developed, because it combines advantages in fuel consumption, driving comfort and shifting quality comparing to a manual transmission [7]. The powertrain influence is discussed in [8] that present a multi‐objective optimisation of the vehicle gearbox, considering 4, 5 and 6 speeds configurations gearboxes, that results in 7.5% reduction in fuel consumption and 6.75% less nitrogen oxide (NOx) emissions. Furthermore, [9] monitors the vehicle emissions by GPS data, that enables definition of the engine regime, once the majority of the tailpipe emission is generated in the cold engine conditions.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy gear shifting control optimisation to improve vehicle performance, fuel consumption and engine emissions

Eckert

Santiciolli

Yamashita

et al. 2019

IET Control Theory & Applications

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Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Cited by 41 publications

References 14 publications

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

Fuel consumption and emission reduction by using a CVT in series with conventional multi-speed transmission

A heuristic synthesis of multistage planetary gearbox layout for automotive transmission

Fuzzy gear shifting control optimisation to improve vehicle performance, fuel consumption and engine emissions

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