The History of Allison Automatic Transmissions For On-Highway Trucks and Buses

Harmon, K. B.

doi:10.4271/982791

Cited by 5 publications

(4 citation statements)

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“…The relative slipping speed of brake C4 is in the opposite direction to the turbine speed, which is considered as the positive direction; therefore, the friction torque of the active disc of C4 is a positive value. From equation (13), with increasing oil pressure of brake C4, both the transmitted torque of brake C5 and the output torque decrease. When the pressure of C4 increases to the critical point where T C5 equals zero, the pressure of C5 must be controlled to zero quickly, and the torque phase is over; then…”

Section: Dynamic Analysis Of the Power-on Upshiftmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11] The operating conditions of a vehicle are complicated and time varying; this requires the control system to have a good robustness. With the continuous progress in manufacturing technology, electronic technology, computer technology, control technology and information networking technology, associated with the development of the AT, a variety of control strategies such as sliding-mode control, [10][11][12] closed-loop adaptive control, 13,14 optimal control, 15,16 neural network control, 17 model predictive control 18,19 and other modern control technologies [20][21][22][23] have been explored for shift control with clutch slipping in the laboratory or by manufacturers. However, most studies of modern control technologies in the literature focus on a sedan AT and seldom on a high-power AT.…”

Section: Introductionmentioning

confidence: 99%

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Unified modelling and control for the power-on gear shift of a planetary transmission

Wang

Chen

Tao

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Estimation of the oil hydraulic pressure for the gear-shift elements can be useful for the development of closed-loop control of the automatic transmission fitted to a heavy off-highway vehicle for a good gear-shift quality, to reduce the dissipated energy and the vehicular shift jerk in complex working conditions. The unified dynamic model for a threedegree-of-freedom planetary automatic transmission is presented, and the power-on upshift from first gear to second gear is considered as an example. The unified model is more efficient than the conventional model for the dynamic analysis; furthermore, it provides a computational method for the inertia of the transmission when in gear. From a phased characteristic analysis, real-time estimation of the oil pressure for the gear-shift elements in the sliding process, i.e. the torque phase and the inertia phase, is addressed; then the improved control scheme for the power-on upshift from first gear to second gear is developed and validated using a heavy off-highway vehicle equipped with a high-power full-range speed-regulating diesel engine. The experimental results show that the model-based oil pressure estimation is able to reflect the dynamic characteristics of the system in changing conditions, and the corresponding control strategy can improve the gear-shift quality and the vehicular performance effectively.

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Section: Dynamic Analysis Of the Power-on Upshiftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unified modelling and control for the power-on gear shift of a planetary transmission

Wang

Chen

Tao

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…For example, six clutch elements are needed for a six-speed automatic transmission with three PGSs based on the switched-input method such as ZF HP500 [6]. However, only five clutch elements are needed for that based on the variable structure method such as Allison HD4060 [7]. However, there are a limited number of studies related to the varying structure theory to guide design of planetary transmission systems.…”

Section: Introductionmentioning

confidence: 97%

Design of Multiple Operating Degrees-of-Freedom Planetary Gear Trains With Variable Structure

Peng

Hu²,

Xie

et al. 2015

Journal of Mechanical Design

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To obtain multiple speed ratios, a synthesis methodology of planetary gear trains (PGTs) with multiple operating degrees of freedom (DOFs) is proposed based on the variable structure method. Variable structure of PGT is accomplished by changing the fixed interconnection edge. First, PGTs with two operating DOFs are synthesized with a deduction method based on the relationship between the number of planetary gear sets (PGSs) and number of fixed interconnection edges. Next, connection characteristics of fixed interconnection edges are defined as frequency of utilization to construct original speed ratios of the two operating DOFs schemes. The connection characteristics are then obtained based on the power-flow analysis. PGT graph model with connection characteristic is built to provide guidance in the design of varying structure. Finally, multi-speed PGTs with multiple operating DOFs are synthesized based on the graph model and lever analogy. A design example for three-PGS PGTs is considered to highlight capabilities of the variable structure method.

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“…Since the equivalent effect radius and number of friction pairs are constants, while the friction coefficient and the clutch pressure keep changing, the author finds that controlling the process of the clutch filltime/ramping off is a great strategy [2].…”

Section: Theory Analysismentioning

confidence: 99%

Research on Self-adaptive Control Technology in Lockup Process of Automatic Transmission

Tong¹,

Liu²

2016

Proceedings of the 2016 International Conference on Mechanics, Materials and Structural Engineering

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Abstract. In order to research the torque converter lockup process and improve the quality, the lockup process system of Electronic Automatic Transmission is analyzed. The lockup process is analyzed detailed and the rule of lockup process is gotten and at the same time the rule of clutch filltime/ramping off is researched. Research shows it can improve the quality of lockup process using the different control strategy in different phases. It is necessary to use the control strategy. Through a test, the process of the clutch fill-time/ramping off, open-loop and closed-loop of adaptive is researched. After using the control strategy, the lockup quality is improved.

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The History of Allison Automatic Transmissions For On-Highway Trucks and Buses

Cited by 5 publications

References 0 publications

Unified modelling and control for the power-on gear shift of a planetary transmission

Unified modelling and control for the power-on gear shift of a planetary transmission

Design of Multiple Operating Degrees-of-Freedom Planetary Gear Trains With Variable Structure

Research on Self-adaptive Control Technology in Lockup Process of Automatic Transmission

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