Shift Quality Improvement through Integrated Control of Dual Clutches Pressure and Engine Speed for DCT

2014 ◽  
Author(s):  
Xiaofeng Yin ◽  
Yuan Zhong ◽  
Xiaohua Wu ◽  
Han Lu
Keyword(s):  
Quality Improvement ◽  
Engine Speed ◽  
Integrated Control ◽  
Shift Quality

Model Predictive Engine Speed Control for Transmissions With Dog Clutches

2016 ◽  
Author(s):  
Qilun Zhu ◽  
Robert Prucka ◽  
Michael Prucka ◽  
Hussein Dourra
Keyword(s):  
Engine Speed ◽  
Speed Control ◽  
Cost Effective ◽  
Combustion Stability ◽  
Design Parameters ◽  
Shift Quality ◽  
Engine Model ◽  
Prediction Horizon ◽  
Indicated Mean Effective Pressure ◽  
The Impact

The need for cost-effective fuel economy improvements has driven the introduction of automatic transmissions with an increasing number of gear ratios. Incorporation of interlocking dog clutches in these transmissions decreases package space and increases efficiency, as compared to conventional dry or wet clutches. Unlike friction based clutches, interlocking dog clutches require very precise rotational speed matching prior to engagement. Precise engine speed control is therefore critical to maintaining high shift quality. This research focuses on controlling the engine speed during a gearshift period by manipulating throttle position and combustion phasing. Model predictive control (MPC) is advantageous in this application since the speed profile of a future prediction horizon is known with relatively high confidence. The MPC can find the optimal control actions to achieve the designated speed target without invoking unnecessary actuator manipulation and violating hardware and combustion constraints. This research utilizes linear parameter varying (LPV) MPC to control the engine speed during the gearshift period. Combustion stability constraints are considered with a control oriented covariance of indicated mean effective pressure model (COV of IMEP). The proposed MPC engine speed controller is validated with a high-fidelity 0-dimensional engine model with crank angle resolution. Four case studies, based on simulation, investigate the impact of different MPC design parameters. They also demonstrate that the proposed MPC engine controller successfully achieves the speed reference tracking objective while considering combustion variation constraints.

Performance of integrated engine-CVT control considering powertrain loss and CVT response lag

2002 ◽  
Vol 216 (7) ◽  
pp. 545-553 ◽  
Author(s):  
T Kim ◽  
H Kim
Keyword(s):  
Control Algorithm ◽  
Engine Speed ◽  
Integrated Control ◽  
Optimal Operation ◽  
Control Algorithms ◽  
Acceleration Response ◽  
Engine Operation ◽  
Variable Transmission ◽  
Ratio Change ◽  
Ratio Response

In this paper, an integrated engine-continuously variable transmission (CVT) control algorithm is suggested by considering the powertrain loss and the inertia torque due to the CVT ratio change. In addition, compensation algorithms to reduce the effect of the CVT ratio response lag on the drive torque are presented. Experimental results show that the optimal engine speed compensation algorithm gives better engine operation around the optimal operation line compared with the optimal torque compensation while showing nearly the same acceleration response. The performance of the proposed integrated engine-CVT control algorithms is compared with that of conventional CVT control, and it is found that better engine operation on the optimal operation line can be achieved by using integrated control during acceleration.

Gear-Shift Control Strategy for a 6 Speed Wet-Type DCT

2013 ◽  
Vol 278-280 ◽  
pp. 1459-1465 ◽  
Author(s):  
Yan Qiong Teng ◽  
Xiao Feng Yin ◽  
De Wang Zhang
Keyword(s):  
Engine Speed ◽  
Ride Comfort ◽  
Unit Area ◽  
Control Strategies ◽  
Time Shift ◽  
Simulation Experiments ◽  
Gear Shift ◽  
Shift Quality ◽  
Shift Control

It is crucial to control the engagement of the in-coming clutch and the disengagement of the off-going clutch for the gear-shift process in order to improve the shift quality of dual clutch transmission (DCT). Aiming at the development of a 6 speed wet-type DCT, three evaluation indices of shift quality including shift time, shift jerk and friction work per unit area, were analyzed in detail. And the torque and the engine speed control strategies for the upshift and the downshift processes were discussed respectively through dividing the gear-shift process into 5 stages. The proposed strategies have been evaluated via simulation experiments of the upshift from gear position 1 to gear position 2 and downshift from gear position 2 to gear position 1, under wide-open throttle respectively. The results show that the proposed strategies can get short shift time and acceptable ride comfort, meanwhile prolong the service life of the friction elements of dual clutches.

Simulation and Analysis of Engine Speed Coordinated Control during TC + AMT Transmission Shifting Process

2013 ◽  
Vol 448-453 ◽  
pp. 3498-3507
Author(s):  
Xing Zhong Li ◽  
Yu Long Lei ◽  
Cheng Yang
Keyword(s):  
Process Simulation ◽  
Engine Speed ◽  
Time Synchronization ◽  
Simulation Models ◽  
Coordinated Control ◽  
Synchronization Process ◽  
Shift Quality ◽  
Speed Controller ◽  
Wear And Tear ◽  
Simulation Results

Coordinated engine control is an essential technology to improve shift quality. The influence of wet clutches’ towing torque in TC+AMT on shift synchronization process is analyzed, and a coordinated engine speed control strategy is proposed. Wet clutches’ towing torque and AMT shift synchronization process simulation models as well as the engine speed controller are developed by using MATLAB/Simulink. Finally the simulation of TC+AMT shifting process with wet clutches under engine speed coordinated control is carried out. The simulation results show that wet clutches’ towing torque can be used to reduce shift synchronization time, synchronization energy and the wear and tear of synchronizer as well as improving shift quality.

Control of Selectable One-Way Clutch in GM Six-Speed Automatic Transmissions

2009 ◽  
Author(s):  
Chunhao J. Lee ◽  
Farzad Samie ◽  
Chi-Kuan Kao
Keyword(s):  
Engine Speed ◽  
Control Strategies ◽  
Transmission Efficiency ◽  
Reverse Direction ◽  
Passenger Vehicle ◽  
Shift Quality ◽  
Automatic Transmissions ◽  
The One ◽  
Free Spins ◽  
Force Pressure

Automatic transmissions use one-way clutches and regular clutches to control gear shifts. Regular one-way clutch locks in one direction and free spins (freewheeling) in the other direction and thus provides good shift quality. However, a clutch is needed if the freewheeling direction needs to be locked. The advantage of a selectable one-way clutch (SOWC) is that it can be designed to act like a regular one-way clutch, fully freewheels or locks in both directions. In the GM six-speed transmissions, there is one one-way clutch which is accompanied by a clutch CB1R to control between 1st gear and reverse direction. The study is to replace the one-way clutch and CB1R clutch with simply one selectable one-way clutch in GM 6-speed transmissions (1). This will eliminate one transmission clutch, reduce weight and cost, and improve transmission efficiency. The proposed design of transmission is applied to a GM SUV and a GM passenger vehicle. Different from a regular clutch, which can be applied with force/pressure from high slippage to lock-up between two elements, a selectable one-way clutch can only be applied to a lock-up position when the slippage between two elements is near zero speed. Also, an SOWC can only be released when there is no torque or force carried by the clutch while a regular clutch can be easily released by dropping the applied force/pressure. These requirements impose challenges of the control strategies of the SOWC, especially during the scenarios such as 2–1 engine idle downshift (engine braking) and 1–2 upshift (coasting). This paper reviews hardware design, vehicle implementation, and focuses on control of the selectable one-way clutch. Vehicle results demonstrate static and rolling garage shifts, 1–2 upshifts, 2–1 and coast downshifts. Also demonstrated is the successful application of engaging 1st gear engine braking with the SOWC. This control involves coordination between the engine speed and SOWC slip speed, and the apply/release of the device.

The Research on Electronic Smart Clutch Operating System

2013 ◽  
Vol 380-384 ◽  
pp. 520-523
Author(s):  
Guan Qiang Ruan ◽  
Jian Cun Liu ◽  
Wen Chao Cheng
Keyword(s):  
Operating System ◽  
Fuel Consumption ◽  
Intelligent Systems ◽  
Engine Speed ◽  
Vehicle Handling ◽  
Shift Quality ◽  
Speed Sensor ◽  
Handicapped People

Today, the sensors are used in the different fields, especially in the automobiles and Aeronautics and Astronautics industry. Speed sensor in the car is very useful . The engine speed sensor and speed sensor are used to collect the movement of the car, which Can intelligently judge drivers true intentions of the operation, in accordance with a set of systems, intelligently solve the problem that driver can not reasonably Use the clutch. Through intelligent systems, controlling the clutch can effectively reduce the fuel consumption of the car.The system enables more intelligent operation of the vehicle, improved shift quality of the car, to improve vehicle handling and stability. Operating system with high intelligent and saving fuel is easy to operate. The operating system can effectively prevent the occurrence of car flameout. The operating system can adapt to all kinds of driver to use, especially for beginners and handicapped people to bring the gospel.

Model Predictive Engine Speed Control for Transmissions With Dog Clutches

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Qilun Zhu ◽  
Robert Prucka ◽  
Michael Prucka ◽  
Hussein Dourra
Keyword(s):  
Engine Speed ◽  
Speed Control ◽  
Cost Effective ◽  
Combustion Stability ◽  
Design Parameters ◽  
Shift Quality ◽  
Engine Model ◽  
Prediction Horizon ◽  
Indicated Mean Effective Pressure ◽  
The Impact

The need for cost-effective fuel economy improvements has driven the introduction of automatic transmissions with an increasing number of gear ratios. Incorporation of interlocking dog clutches in these transmissions decreases package space and increases efficiency, as compared to conventional dry or wet clutches. Unlike friction-based clutches, interlocking dog clutches require very precise rotational speed matching prior to engagement. Precise engine speed control is, therefore, critical to maintaining high shift quality. This research focuses on controlling the engine speed during a gearshift period by manipulating throttle position and combustion phasing. Model predictive control (MPC) is advantageous in this application since the speed profile of a future prediction horizon is known with relatively high confidence. The MPC can find the optimal control actions to achieve the designated speed target without invoking unnecessary actuator manipulation and violating hardware and combustion constraints. This research utilizes linear parameter varying (LPV) MPC to control the engine speed during the gearshift period. Combustion stability constraints are considered with a control-oriented covariance of indicated mean effective pressure model (COV of IMEP). The proposed MPC engine speed controller is validated with a high-fidelity zero-dimensional engine model with crank angle resolution. Four case studies, based on simulation, investigate the impact of different MPC design parameters. They also demonstrate that the proposed MPC engine controller successfully achieves the speed reference tracking objective while considering combustion variation constraints.

Research on Integrated Shift Control Strategy for Automatic Transmission

2016 ◽  
Vol 835 ◽  
pp. 687-692 ◽  
Author(s):  
Lin Yue Zhang ◽  
Yao Fu ◽  
Xing Zhong Li
Keyword(s):  
Control Strategy ◽  
Integrated Control ◽  
Automatic Transmission ◽  
Shift Quality ◽  
Shift Control ◽  
Output Torque ◽  
Control Target ◽  
Simulation Results ◽  
Process Engine ◽  
Control Principle

Shift process of automatic transmission is divided into torque phases and inertia phase, and the control principle of clutch to clutch shift is studied with the lever method. Then, inertia phase engine and transmission integrated control principle and entire shift process engine and transmission integrated control principle are respectively studied with taking power on up shift as study example and taking the transmission output torque fluctuations during shifting minimum as control target. Simulation results are compared to the results of power on up shift without engine and transmission integrated control, and it is proved that the transmission output torque overshoot peak with inertia phase engine and transmission integrated control strategy is decreased significantly and shifting jerks are reduced. Shift quality is improved significantly.

Sign in / Sign up

Export Citation Format

Share Document