Analysis of Improving Automatic Transmission Upshift Performance by Using Off-Going Clutch During Inertia Phase

Abstract The paper presents a detailed numerical and algebraic analysis of potential for improving the step ratio automatic transmission (AT) upshift performance by means of modulating the off-going clutch during the inertia phase. The numerical analysis is based on Pareto optimal frontiers obtained by using the previously developed methods for AT shift control trajectory optimization and piecewise-linear control profile parameter optimization, where the control objectives include minimization of shift time, vehicle RMS jerk, and clutch dissipated energy. The analysis concerns the following control scenarios related to inertia phase: 1) oncoming clutch control only, 2) combined action of oncoming and off-going clutch; 3) oncoming clutch control extended with engine torque reduction control, and 4) combining all three control actions. The numerical results relate to an advanced 10-speed AT and various single-step and double-step upshifts, with emphasis on 1-3 shift. The numerical analysis results are proven algebraically based on a simplified AT model represented in bond graph form. The presented analysis shows that the off-going clutch can reduce either shift time or RMS jerk index by introducing power recirculation via the two clutches, which is in turn paid for by certain increase of AT energy loss.

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A study of shift control using the clutch pressure pattern in automatic transmission

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/09544070360613246 ◽

2003 ◽

Vol 217 (4) ◽

pp. 289-298 ◽

Cited By ~ 16

Author(s):

Woosung Han ◽

Seung-Jong Yi

Keyword(s):

Dynamic Models ◽

Equations Of Motion ◽

Automatic Transmission ◽

Torque Converter ◽

Optimum Pressure ◽

Planetary Gears ◽

Transient Characteristics ◽

Engine Torque ◽

Shift Control ◽

Road Load

It is necessary to understand the overall system including engine, torque converter, multiplate clutch, band brake, one-way clutch, planetary gears, road load and tyre to analyse the performance of the vehicle powertrain. The performance of the powertrain can be analysed using dynamic models including transient characteristics and the equations of motion are derived from the dynamic models of the powertrain. In this study, the shift transient characteristics of the vehicle equipped with a Ravigneaux-type planetary gears automatic transmission has been investigated. A shift control using engine torque reduction and optimum pressure trajectory has also been investigated in order to enhance transient characteristics during shift.

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Trajectory Optimization using Piecewise Linear Approximation Dynamic Programming

AEROSPACE TECHNOLOGY JAPAN THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES ◽

10.2322/astj.14.33 ◽

2015 ◽

Vol 14 (0) ◽

pp. 33-41

Author(s):

Haruki MATSUDA ◽

Akinori HARADA ◽

Yoshikazu MIYAZAWA

Keyword(s):

Dynamic Programming ◽

Linear Approximation ◽

Trajectory Optimization ◽

Piecewise Linear ◽

Piecewise Linear Approximation

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

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407017713102 ◽

2017 ◽

Vol 232 (7) ◽

pp. 958-972

Author(s):

Erlie Wang ◽

Huiyan Chen ◽

Gang Tao ◽

Xianhui Wang ◽

Hongliang Wang

Keyword(s):

Full Range ◽

Automatic Transmission ◽

Time Estimation ◽

Computational Method ◽

Dissipated Energy ◽

Hydraulic Pressure ◽

Characteristic Analysis ◽

Loop Control ◽

Gear Shift ◽

Shift Quality

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 three-degree-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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Smooth Gear Shift Control System of Automatic Transmission Using Estimated Output Shaft Torque.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C ◽

10.1299/kikaic.61.4334 ◽

1995 ◽

Vol 61 (591) ◽

pp. 4334-4338

Author(s):

Toshimichi Minowa ◽

Hiroshi Kimura ◽

Junichi Ishii ◽

Masahiko Ibamoto

Keyword(s):

Control System ◽

Automatic Transmission ◽

Output Shaft ◽

Gear Shift ◽

Shift Control ◽

Shaft Torque

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Tracking control and robustness study of shifting process

Archives of Transport ◽

10.5604/01.3001.0012.2111 ◽

2018 ◽

Vol 46 (2) ◽

pp. 99-106

Author(s):

Xin-xin Zhao ◽

Chao Guan

Keyword(s):

Monte Carlo ◽

Monte Carlo Method ◽

Tracking Control ◽

Pid Controller ◽

Automatic Transmission ◽

Good Control ◽

Simulation Software ◽

Control Effect ◽

Engine Torque ◽

Shift Quality

Heavy dump vehicles are usually working with big load changes and bad work environment, thus change the friction performance of transmission clutches, as well as great affect the shift quality seriously, which influence the vehicle performance. Many researchers developed a lot to design a useful automatic transmission control system. Using PID tracking control and Monte Carlo method, the controller based on an dynamic model was set up to analyze the shifting process of automatic transmission and its robustness in this paper．The shift process was divided into four stages, low-gear phase, torque phase, inertia phase and high-gear phase. The model presents the process from the first gear to the second gear when the torque has big change．Since the jerk and the friction work of clutch are both related to the speed of clutch which was easier to control, it was chose as the target to control the oil pressure for satisfying the requirement of shift quality．The simulation software, Maplesim and Simulink, were used to build the vehicle model and shifting controller for simulation under different working conditions, and the maximum jerk was changed from 34 m/s3 to 12 m/s3 after the optimization. In this paper the Monte Carlo has been used to quantize and evaluate the robustness of the closed-loop system for the friction coefficients and output torque of turbine variation leading by the friction feature parameters and throttle angle changed. Monte Carlo method was used to analyze the effectiveness and robustness of PID controller, which proves that it has good control effect when the throttle is ongoing minor fluctuations. When the throttle is full opening, a quadratic optimal controller based on disturbance is designed by the method of multi-objective optimization. When it changes within 20 percent, PID controller was designed under the guidance of tracking thoughts. The results also show that the controller could still obtain better effect when the friction coefficient ranged from -40 % to 40 % as well as engine torque changed from -20 % to 20 %, which indicates the robustness of controller.

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Electronic Transmission Controls

10.4271/9780768006315 ◽

2000 ◽

Keyword(s):

Internal Combustion Engines ◽

Automatic Transmission ◽

Transmission Efficiency ◽

General Motors ◽

Navigation Systems ◽

Automotive Electronics ◽

Passenger Cars ◽

Mechatronic Systems ◽

Shift Control ◽

Continuously Variable Transmissions

The evolution of the automotive transmission has changed rapidly in the last decade, partly due to the advantages of highly sophisticated electronic controls. This evolution has resulted in modern automatic transmissions that offer more control, stability, and convenience to the driver. Electronic Transmission Controls contains 68 technical papers from SAE and other international organizations written since 1995 on this rapidly growing area of automotive electronics. This book breaks down the topic into two sections. The section on Stepped Transmissions covers recent developments in regular and 4-wheel drive transmissions from major auto manufacturers including DaimlerChrysler, General Motors, Toyota, Honda, and Ford. Technology covered in this section includes: smooth shift control; automatic transmission efficiency; mechatronic systems; fuel saving technologies; shift control using information from vehicle navigation systems; and fuzzy logic control. The section on Continuously Variable Transmissions presents papers that demonstrate that CVTs offer better efficiency than conventional transmissions. Technologies covered in this section include: powertrain control; fuel consumption improvement; development of a 2-way clutch system; internal combustion engines with CVTs in passenger cars; control and shift strategies; and CVT application to hybrid powertrains. The book concludes with a chapter on the future of electronic transmissions in automobiles.

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HYPERCHAOS IN A MODIFIED CANONICAL CHUA'S CIRCUIT

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127404009119 ◽

2004 ◽

Vol 14 (01) ◽

pp. 221-243 ◽

Cited By ~ 141

Author(s):

K. THAMILMARAN ◽

M. LAKSHMANAN ◽

A. VENKATESAN

Keyword(s):

Numerical Analysis ◽

Differential Equations ◽

Ordinary Differential Equations ◽

Laboratory Experiments ◽

System Parameter ◽

Piecewise Linear ◽

Electrical Circuit ◽

First Order ◽

Regular Behavior ◽

Linear Elements

In this paper, we present the hyperchaos dynamics of a modified canonical Chua's electrical circuit. This circuit, which is capable of realizing the behavior of every member of the Chua's family, consists of just five linear elements (resistors, inductors and capacitors), a negative conductor and a piecewise linear resistor. The route followed is a transition from regular behavior to chaos and then to hyperchaos through border-collision bifurcation, as the system parameter is varied. The hyperchaos dynamics, characterized by two positive Lyapunov exponents, is described by a set of four coupled first-order ordinary differential equations. This has been investigated extensively using laboratory experiments, Pspice simulation and numerical analysis.

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Optimal integrated energy management and shift control in parallel hybrid electric vehicles with dual-clutch transmission

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407019857419 ◽

2019 ◽

Vol 234 (2-3) ◽

pp. 599-609

Author(s):

Guoqiang Li ◽

Daniel Görges

Keyword(s):

Fuel Consumption ◽

Energy Management ◽

Electric Vehicles ◽

Hybrid Electric Vehicles ◽

Weighting Factor ◽

Engine Torque ◽

Shift Control ◽

Parallel Hybrid ◽

Power Split ◽

Hc Emissions

This paper addresses the integration of the energy management and the shift control in parallel hybrid electric vehicles with dual-clutch transmission to reduce the fuel consumption, decrease the pollutant emissions, and improve the driving comfort simultaneously. Dynamic programming with a varying weighting factor in the cost function is proposed to balance the shift frequency and the fuel consumption for the power-split control and gear schedule design. Simulation results present that the drivability can be improved with a varying weighting factor due to fewer shift events while the fuel consumption is only slightly increased compared to dynamic programming with a constant weighting factor. A shift-energy-management strategy integrating the upshift and power-split control based on a multi-objective optimization is presented where model predictive control is employed to ensure engine load rate constraints. The strategy can smoothen the engine torque through torque compensation from the electric motor to prevent engine transient emissions resulting from a sudden load change. In a simulation study, the NOx and HC emissions could be reduced by 1.4% and 2.6% with 2% increase of the overall fuel consumption for the Federal Test Procedure 75 by smoothening the engine torque. For the New European Driving Cycle, 0.9% and 1.1% reduction of NOx and HC emissions could be achieved with only 0.3% more fuel consumption.

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