Development of Smooth Up-Shift Control Technology for Automatic Transmissions with Integrated Control of Engine and Automatic Transmission

Tokura, Takaaki; Asami, Tomohiro; Hasegawa, Yoshio; Sugimura, Toshio; Kono, Katsumi; Aoki, Kenji

doi:10.4271/2007-01-1310

Cited by 10 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent analysis has shown that the transmission gear shift performance can be improved during the upshift by simply adding a brief input torque (e.g. an engine torque) modulation scheme, 17,18 as well as an optimized clutch-to-clutch control strategy. 16 The alternative approach for an AT-based parallel HEV has recently been studied using electric motor speed control, instead of engine torque control, because the control response of most electric motors is much faster than that of an engine.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Systematic gear shift model for an automatic-transmission-based parallel hybrid electric vehicle

Kim

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

This paper presents a new systematic gear shift modelling approach for the real-time powertrain control and simulation of a multi-stepped automatic-transmission-based powertrain system such as parallel-type hybrid electric vehicles. The power/on 1 ! 2 upshift modelling of a six-speed automatic transmision which is the main element of a Lepelletier-type planetary gear set is first performed to illustrate the procedure of the proposed gear shift modelling. A condensed algebraic formulation of the gear shift for each state is derived for a computationally efficient calculation based on the system matrix obtained from all governing equations. Finally, a non-linear shift simulation and brief open-loop shift control using MATLAB/Stateflow Ò are performed to demonstrate the effectiveness of the proposed gear shift model.

show abstract

Section: Simulation Results and Discussionmentioning

confidence: 99%

Systematic gear shift model for an automatic-transmission-based parallel hybrid electric vehicle

Kim

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…However, considering only the kinematic of the transmission system and using Newton's second law, it is possible to calculate all torques applied on the different planetary gearset components in order to describe the rotational dynamics. This approach, referred to as the matrix method in [7], is more efficient for the analysis of larger and more complex transmissions systems and is used in Paper 7 as well as [77]. Figure 2.3: Schematic illustration of the transmission torque during an engine controlled gearshift in an AMT system.…”

Section: Modeling For At Gear Shift Controlmentioning

confidence: 99%

Modeling and Optimal Control of Heavy-Duty Powertrains

Nezhadali

2016

View full text Add to dashboard Cite

The cover: The background photo on the cover shows the Roxen lake with Linköping on it's horizon. At the begining of my very first presentation in Linz 2013, I introduced the city of my studies with this picture. I wanted to finish with the same picture which will remind me of my 7 years in Linköping whenever I look at this dissertation. The graphic figure on top of the background, shows the feasible regions of operation for two subsystems, and two sets of state trajectories. More about this is described at the end of chapter 2. Typeset with L A T E X 2εPrinted by LiU-Tryck, Linköping, Sweden 2016 To Samira and my parents i AbstractHeavy duty powertrains are complex systems with components from various domains, different response times during transient operations and different efficient operating ranges. To ensure efficient transient operation of a powertrain, e.g. with low fuel consumption or short transient duration, it is important to come up with proper control strategies. In this dissertation, optimal control theory is used to calculate and analyze efficient heavy duty powertrain controls during transient operations in different applications. This is enabled by first developing control ready models, usable for multi-phase optimal control problem formulations, and then using numerical optimal control methods to calculate the optimal transients.Optimal control analysis of a wheel loader operating in a repetitive loading cycle is the first studied application. Increasing fuel efficiency or reducing the operation time in such repetitive loading cycles sums up to large savings over longer periods of time. Load lifting and vehicle traction consume almost all of the power produced by a diesel engine during wheel loader operation. Physical models are developed for these subsystems where the dynamics are described by differential equations. The model parameters are tuned and fuel consumption estimation is validated against measured values from real wheel loader operation. The sensitivity of wheel loader trajectory with respect to constrains such as the angle at which the wheel loader reaches the unloading position is also analyzed. A time and fuel optimal trajectory map is calculated for various unloading positions. Moreover, the importance of simultaneous optimization of wheel loader trajectory and the component transients is shown via a side to side comparison between measured fuel consumption and trajectories versus optimal control results.In another application, optimal control is used to calculate efficient gear shift controls for a heavy duty Automatic Transmission system. A modeling and optimal control framework is developed for a nine speed automatic transmission. Solving optimal control problems using the developed model, time and jerk efficient transient for simultaneous disengagement of off-going and engagement of in-coming shift actuators are obtained and the results are analyzed.Optimal controls of a diesel-electric powertrain during a gear shift in an Automated Manual Transmission system are calcula...

show abstract

“…In conventional automatic transmission of the passenger cars, the torque shock can be reduced by the clutch slip control using the electronically controlled proportional valve. 15,16,24,25 However, this requires additional cost and accurate control of the clutch pressure. In the tractor, shift quality is not as important in passenger cars and therefore if we can reduce the torque variation using the on/off valves, manufacturing cost can be considerably reduced.…”

Section: Sub-shift Clutch Control and Hsu Stroke Durationmentioning

confidence: 99%

Development of a sub-shift control algorithm for an agricultural tractor with hydro-mechanical transmission

Ahn

Choi

Kim

et al. 2016

Advances in Mechanical Engineering

View full text Add to dashboard Cite

A sub-shift control algorithm was proposed for an agricultural tractor with hydro-mechanical transmission. The hydromechanical transmission investigated in this study consists of a hydro-static unit and planetary gear sets which provide a continuously variable transmission function and four sub-shift gears. The sub-shift needs to be carried out at the hydrostatic unit stroke where the speed of the off-going and oncoming clutches is synchronized. To reduce the hydro-static unit stroke error due to the nonlinear characteristic, the hysteresis characteristic was investigated in the test bench and a hysteresis compensator was developed. Using the compensator in the feedforward loop, a hydro-static unit stroke control algorithm was proposed and validated via experiment. To prevent the torque interruption during the sub-shift, a time delay of the off-going clutch was proposed. In addition, a hydro-static unit stroke duration which maintains the target stroke during the sub-shift was suggested to reduce the speed difference between the clutch plates. The sub-shift control algorithm including the hysteresis compensation, time delay of the off-going clutch, and hydro-static unit stroke duration was evaluated via experiment. It was found from the experimental results that the sub-shift was performed smoothly without the torque interruption, even in the acceleration state when large inertial torque change occurred.

show abstract

Development of Smooth Up-Shift Control Technology for Automatic Transmissions with Integrated Control of Engine and Automatic Transmission

Cited by 10 publications

References 0 publications

Systematic gear shift model for an automatic-transmission-based parallel hybrid electric vehicle

Systematic gear shift model for an automatic-transmission-based parallel hybrid electric vehicle

Modeling and Optimal Control of Heavy-Duty Powertrains

Development of a sub-shift control algorithm for an agricultural tractor with hydro-mechanical transmission

Contact Info

Product

Resources

About