Shift speed control in CVT powertrain

Mamala, Jarosław; Jantos, Jerzy

doi:10.1504/ijvd.2010.034868

Cited by 6 publications

(4 citation statements)

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“…The author's work [21] highlights the diversification of a car's energy demand in real traffic conditions resulting from the dynamics of its acceleration. This problem is also described in works [22][23][24][25] concerning increased fuel consumption because of an aggressive driving style. In road tests, significant discrepancies in the mileage fuel consumption were found, ranging from 12.44 to 31.8 (l/100 km), which translates into the recorded energy expenditure from 1.67 to 4.29 (MJ) over a distance of a 1 4 mile, depending on the dynamics of acceleration and choice gear ratios in the drivetrain.…”

Section: Introductionmentioning

confidence: 91%

Analysis of the Total Unit Energy Consumption of a Car with a Hybrid Drive System in Real Operating Conditions

2021

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The market demand for vehicles with reduced energy consumption, as well as increasingly stringent standards limiting CO2 emissions, are the focus of a large number of research works undertaken in the analysis of the energy consumption of cars in real operating conditions. Taking into account the growing share of hybrid drive units on the automotive market, the aim of the article is to analyse the total unit energy consumption of a car operating in real road conditions, equipped with an advanced hybrid drive system of the PHEV (plug-in hybrid electric vehicles) type. In this paper, special attention has been paid to the total unit energy consumption of a car resulting from the cooperation of the two independent power units, internal combustion and electric. The results obtained for the individual drive units were presented in the form of a new unit index of the car, which allows us to compare the consumption of energy obtained from fuel with the use of electricity supported from the car’s batteries, during journeys in real road conditions. The presented research results indicate a several-fold increase in the total unit energy consumption of a car powered by an internal combustion engine compared to an electric car. The values of the total unit energy consumption of the car in real road conditions for the internal combustion drive are within the range 1.25–2.95 (J/(kg · m)) in relation to the electric drive 0.27–1.1 (J/(kg · m)) in terms of instantaneous values. In terms of average values, the appropriate values for only the combustion engine are 1.54 (J/(kg · m)) and for the electric drive only are 0.45 (J/(kg · m)) which results in the internal combustion engine values being 3.4 times higher than the electric values. It is the combustion of fuel that causes the greatest increase in energy supplied from the drive unit to the car’s propulsion system in the TTW (tank to wheels) system. At the same time this component is responsible for energy losses and CO2 emissions to the environment. The results were analysed to identify the differences between the actual life cycle energy consumption of the hybrid powertrain and the WLTP (Worldwide Harmonized Light-Duty Test Procedure) homologation cycle.

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Section: Introductionmentioning

confidence: 91%

Analysis of the Total Unit Energy Consumption of a Car with a Hybrid Drive System in Real Operating Conditions

2021

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“…All those achievements are contributing to efficiency improvement and jerk reduction. In addition to those studies, various investigations have been carried out to control this gearbox by using various controls, such as proportional-integralderivative (PID) [7], linear-quadratic regulator (LQR) [8], fuzzy control [9], backstepping control [10].…”

Section: Introductionmentioning

confidence: 99%

HIL Evaluation of a Novel Real-time Energy Management System for an HEV with a Continuously Variable Transmission

Taghavipour

Alipour

2021

SV-JME

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One of the most important challenges facing automotive engineers is reducing vehicle fuel consumption and improving the drivability index. Modern hybrid electric powertrains play an important role in reducing fuel consumption. Continuously variable transmission (CVT) is an automatic transmission that can change the gear ratio seamlessly using a belt and pulleys. CVT performs with infinite gear ratios. Controlling and determining the optimal gear ratio, especially in a complex hybrid powertrain, is a major challenge. Therefore, a multi-parametric model predictive controller with real-time implementation capability is proposed that can handle the energy management task concurrently with gear shifting strategy in a parallel pre-transmission hybrid electric vehicle. The proposed controller hardware-in-the-loop (HIL) validation procedure on the high-fidelity Autonomie model shows significant improvement in fuel economy while maintaining drivability in three different driving schedules. HIL evaluation guarantees the real-time capability and the proposed controller readiness to be implemented to real-world control hardware.

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“…Under such conditions, both the fatigue crack growth rate and the crack growth direction are important . Investigations of mixed modes and their results in the energy approach are rarely presented in literature, especially those for mixed modes I + III and II + III. The results obtained for the stress approach are most often presented.…”

Section: Introductionmentioning

confidence: 99%

Fracture curves for mixed modes loading

Rozumek

2019

Mat Design & Process Comms

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The paper presents the results of experimental tests on the fatigue crack growth under tension and bending with torsion. The tests were performed for different ratios of mode I and mode II and mode I and mode III with use of parameter ΔJ. Plane specimens with stress concentrators factor were tested. In the case of mixed mode I + II, the results of the experiment shift in the direction the mode II and in the case of the mixed mode I + III in the direction the mode I. The work compared curves based on the energy parameter ΔJ and the parameter ΔK (elliptical formula) with the test results. The fracture curves obtained from experiments and calculations allow to plot the fracture surfaces for a given material and three mixed modes.

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Shift speed control in CVT powertrain

Cited by 6 publications

References 0 publications

Analysis of the Total Unit Energy Consumption of a Car with a Hybrid Drive System in Real Operating Conditions

Analysis of the Total Unit Energy Consumption of a Car with a Hybrid Drive System in Real Operating Conditions

HIL Evaluation of a Novel Real-time Energy Management System for an HEV with a Continuously Variable Transmission

Fracture curves for mixed modes loading

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