Transmission Clutch Fill Control Using a Customized Dynamic Programming Method

2009 American Control Conference

2009

This paper presents the modeling and control design of a new fully flexible engine valve actuation system which is an enabler for camless engines. Unlike existing electromechanical or servo actuated electro-hydraulic valve actuation systems, precise valve motion control is achieved with a hydromechanical internal feedback mechanism. This feedback mechanism can be turned on or off in real-time using simple two state valves which helps reduce the system cost and enables mass production. Since the external control only activates or deactivates the internal feedback mechanism, the trajectory of the entire closed-loop system is purely dependent on the design parameters of the internal feedback system. A mathematical model of the system is developed to evaluate the effect of each of the design parameters. The "Area-schedule" is identified as the key design feature which affects the trajectory of the closedloop system. It needs to be designed systematically to optimize the performance of the system as well as improve its robustness. By treating this feature as the feedback control variable, the design problem is transformed into a nonlinear optimal control problem which is later solved using the numerical dynamic programming method. The effectiveness of the designed areaschedules is verified with simulations.

Section: B Optimization Of the Area-schedulementioning

confidence: 99%

“…The improved dynamic programming method presented in [15] is thus used for the solution of the reduced order optimization problem. The parameter A spool (t) is the control input which needs to be optimized to control the trajectory of X act , V act and P a .…”

Section: Dynamic Programming Using a Reduced Order Modelmentioning

confidence: 99%

Modeling and control design of a camless valve actuation system

Gillella

2009 American Control Conference

2009

“…To convert DP into a finite computational problem, the standard method is to use state space quantization [8,[11][12][13]. By applying this approach, the state space is discretized into finite grids according to…”

Section: Application Of Dynamic Programming To the Optimal Clutch Engmentioning

confidence: 99%

“…This process is called clutch fill and engagement. The dynamics associated with clutch engagement can be modelled as [8,9]…”

Section: Hydraulic Clutch Actuator Modelmentioning

confidence: 99%

“…In this section, the application of the conventional numerical DP for the clutch engagement control problem is discussed. To convert DP into a finite computational problem, the standard method is to use state space quantization [8,[11][12][13]. By applying this approach, the state space is discretized into finite grids according to…”

Section: Application Of Dynamic Programming To the Optimal Clutch Engagement Controlmentioning

confidence: 99%

See 1 more Smart Citation

Modelling, control, and hardware-in-the-loop simulation of an automated manual transmission

Song

Proceedings of the Institution of Mechanical Engineers, Part D:

Yang

et al. 2009

To enable a realistic automated manual transmission (AMT) system performance evaluation and rapid prototyping, this paper focuses on constructing a practical Simulink model and a hardware-in-the-loop (HIL) real-time simulation. The working principle and dynamic characteristics of the AMT system are first explored. The driveline, the engine control, and the dry clutch are modelled and analysed. In particular, a dynamic model for the hydraulic clutch actuator that is currently used in the actual transmissions is developed. To evaluate the performance and operation characteristics of the AMT system, the control methodology to ensure desirable performance is studied. The gearshift control logic and the proportionalintegral-derivative-based clutch control are analysed and implemented. Based on the dynamic model and the controller, a Simulink model is developed and implemented into an HIL realtime simulator to enable rapid prototyping. In addition, to realize an energy-efficient and smooth clutch engagement, the possibility of using the dynamic programming method to generate the optimal clutch and engine torque control inputs is investigated as well. In particular, the controllability of the AMT system is studied to determine the number of control inputs necessary for optimal control. To this end, the simulation and experiment results in the HIL environment are presented.

Modeling, analysis, and optimal design of the automotive transmission ball capsule system

Song

Zulkefli

2009 American Control Conference

et al. 2009

Self Cite

Clutch shift control is critical for the performance and fuel economy of automotive transmission, including both automatic and hybrid transmissions. Among all the factors that influence clutch shift control, clutch fill and clutch engagement are crucial to realize a fast and smooth clutch shift. When the clutch is not engaged, the fluid held by the centrifugal force inside of the clutch chamber, which introduces additional pressure that will affect the subsequent clutch fill and engagement processes, should be released. To realize this function, a ball capsule system is introduced and mounted on the clutch chamber. When the clutch is ready to be filled for engagement, the ball capsule needs to close quickly and remain closed until the clutch is disengaged. It's also desirable to have appropriate closing velocity for the ball capsule to minimize noise and wear. In this paper, we will model the ball capsule dynamics and reveal its intrinsic positive feedback structure, which is considered to be the key to realize a fast response, and design the optimal shape of the capsule to achieve the desired performance.