Welcome to the National Transport Library Catalogue

Normal view MARC view

Driveline modeling and control Pettersson, Magnus

By: Series: Linköping Studies in Science and Technology. Dissertation ; 484Publication details: Linköping Linköping University. Vehicular Systems, 1997ISBN:
  • 9178719372
Subject(s): Online resources: Dissertation note: Diss. Linköping : Linköping University. Vehicular Systems, 1997 Abstract: A vehicular drivline is the system used to transfer engine torque to the wheels. Resonance in the elastic parts of the driveline are important to handle when control of the engine and the transmission is optimized. Gear shifting by engine control is a new approach for automatic gear shifting with disengaging the clutch replaced by engine control. Resonances are exited in an uncontrolled driveline if the time for shifting to neutral gear is decreased. This leads to problems with disengaging the old gear and synchronizing speeds for engaging the new gear. Internal driveline torque control is a novel idea for handling resonances and increasing the shift quality. By estimating the transmitted torque and controlling it to zero by engine control, the gear can systematically be disengaged with minimized driver disturbances and faster speed synchronization. Field trials show fast shifts to neutral gear, despite disturbances and driveline oscillations at the start of the gear shift. The control scheme is simple and robust against variations among different gears. Futhermore damping of driveline resonanes can be obtained with and observer in combination with a PID feedback structure, despite the higher order driveline system. Traditional diesel engine speed control maintains a well damped engine speed set by the driver. However, the resonance modes of the driveline are easily excited by accelerator-position changes or by road disturbances. A speed-control strategy is proposed that includes the behavior of the driveline, and reduces driveline resonances and vehicle shuffle by engine control. Implementation shows significant reduction also when facing nonlinear torque limitations from maximum torque and diesel smoke delimiters. A basis for both applications is a driveline model with a drive-shaft flexibility, and an analysis of the control problem. The model captures the first main resonance model of the driveline and is sufficiently detailed for control design. Futhermore, the response time of the diesel engine is shown to be sufficient for reducing the first resonance mode.
Item type: Dissertation
No physical items for this record

Diss. Linköping : Linköping University. Vehicular Systems, 1997

A vehicular drivline is the system used to transfer engine torque to the wheels. Resonance in the elastic parts of the driveline are important to handle when control of the engine and the transmission is optimized. Gear shifting by engine control is a new approach for automatic gear shifting with disengaging the clutch replaced by engine control. Resonances are exited in an uncontrolled driveline if the time for shifting to neutral gear is decreased. This leads to problems with disengaging the old gear and synchronizing speeds for engaging the new gear. Internal driveline torque control is a novel idea for handling resonances and increasing the shift quality. By estimating the transmitted torque and controlling it to zero by engine control, the gear can systematically be disengaged with minimized driver disturbances and faster speed synchronization. Field trials show fast shifts to neutral gear, despite disturbances and driveline oscillations at the start of the gear shift. The control scheme is simple and robust against variations among different gears. Futhermore damping of driveline resonanes can be obtained with and observer in combination with a PID feedback structure, despite the higher order driveline system. Traditional diesel engine speed control maintains a well damped engine speed set by the driver. However, the resonance modes of the driveline are easily excited by accelerator-position changes or by road disturbances. A speed-control strategy is proposed that includes the behavior of the driveline, and reduces driveline resonances and vehicle shuffle by engine control. Implementation shows significant reduction also when facing nonlinear torque limitations from maximum torque and diesel smoke delimiters. A basis for both applications is a driveline model with a drive-shaft flexibility, and an analysis of the control problem. The model captures the first main resonance model of the driveline and is sufficiently detailed for control design. Futhermore, the response time of the diesel engine is shown to be sufficient for reducing the first resonance mode.