Comparison of Operational Characteristics in Power Split Continuously Variable Transmissions

Carl, Blake; Ivantysynova, Monika; Williams, Kyle

doi:10.4271/2006-01-3468

Cited by 38 publications

(35 citation statements)

References 6 publications

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“…The ICPS requires smaller displacement machines than an HST to accomplish the same conversion range and can consequently be realised in a relatively compact design [17]. The efficiency is also higher throughout the speed range even though there is a high amount of recirculating power at low speeds.…”

Section: Discussionmentioning

confidence: 93%

“…The OCPS is advantegeous with respect to the control effort compared to the ICPS since the vehicle speed is proportional to the variator speed ratio at low speeds [17]. It is often stated that the efficiency of an OCPS is generally higher than for an ICPS and an HST over the entire speed range [16,17].…”

Section: Discussionmentioning

confidence: 99%

“…At the full mechanical point, the speed ratio of the variator approaches infinity. This point is often designed to be the maximum speed of the vehicle to obtain a high efficiency throughout the speed range [17]. To further increase the vehicle speed, Unit 2 has to be controllable over-centre to achieve a negative speed ratio for the variator.…”

Section: Output-coupled Power-split Transmissionmentioning

confidence: 99%

“…2.6 with the input shaft to the left and the output shaft to the right. They are here simply named configuration A-C and will be denoted ICPS A-C. Configuration A (ICPS A) is the configuration traditionally referred to only as input-coupled power-split, see for instance [12,[16][17][18]. Configurations B and C are more often seen in multiple-mode transmissions.…”

Section: Input-coupled Power-split Transmissionmentioning

confidence: 99%

“…coupled power-split, see for instance [12,[16][17][18]. power is transferred through the hydraulic variator.…”

Section: Output-coupled Power-split Transmissionmentioning

confidence: 99%

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Design Automation of Complex Hydromechanical Transmissions

Pettersson¹

2013

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This thesis proposes an automated methodology for the design of complex multiple-mode hydromechanical transmissions. High fuel prices and strict emission regulations are today drivers of the development of new fuel-efficient drive transmissions for construction machinery. Hydromechanical transmissions have high energy efficiency and a wide torque/speed conversion range. They are today strong candidates to replace the fuel-thirsty torque converters conventionally used in heavy construction machines. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of different architectures. This increases the need for reliable concept evaluation in early design stages. The design of the transmission is also strongly coupled to its energy consumption and for a fair comparison between transmission concepts optimal designs are necessary.Design automation and optimisation with detailed simulation models can support the industrial engineer in the design task and increase the available knowledge early in the design process. The proposed methodology uses simulation-based optimisation to design the transmission for a specific vehicle application. Various aspects of the transmission's characteristics may be targeted, although energy efficiency is in great focus in this work. To evaluate the energy efficiency, the transmission designs are simulated using backward-facing simulations with detailed power loss models. The methodology is applicable for designing the drive transmissions of construction machines and other mobile working vehicles such as agricultural machines, forest machines and mobile mining equipment.

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Section: Discussionmentioning

confidence: 93%