Simulation and Control of an Automotive Dry Clutch

Abstract-In this paper the dynamic behavior and control of an automotive dry clutch is analyzed. Thereto, a straightforward model of the clutch is embedded within a dynamic model of an automotive powertrain comprising an internal combustion engine, drivetrain and wheels moving a vehicle through tire-road adhesion. The engagement of the clutch is illustrated using the model best suited for simulation, based on work of Karnopp. These simulation results are used for conceiving a decoupling controller for the engine and clutch torque. Simulation results with the controller show significant improvement over the un-controlled case in terms of vehicle launch comfort. A modified controller is proposed that results in even more appreciated drive comfort while not deteriorating other system behavior

"Connect & drive" C&D C-ACC for reducing congestion dynamics

This paper concentrates on a recently started project (Q4-2008), entitled "Connect &amp; Drive" (C&amp;D) defined in The Netherlands and subsidized by government funding. This project combines Adaptive Cruise Control techniques, vehicle-to-vehicle and vehicle-to-infrastructure communication to dampen congestion dynamics. This is termed "Cooperative Adaptive Cruise Control" (CACC). The use of this Advanced Driver Assistant (ADA) system will result in currently unforeseeable benefits on emissions and congestions, particularly since they are mutually enforcing mechanisms. The paper describes the Connect &amp; Drive definition, motivation for this definition and some preliminary expected results on congestion damping. Furthermore, the underlying research and development work that is currently ongoing in The Netherlands within the framework of the Connect &amp; Drive project is also briefly addressed throughout the paper.</p

Coordinated control of the Zero Inertia Powertrain

X+200hlm.;24c

New concepts for control of power transients in flywheel assisted drivelines with a CVT

Vehicle powertrains with a continuously variable transmission (CVT) have a large freedom in controlling the engine speed and the torque at the wheels. Due to rotating inertias within the engine and transmission, the response of the vehicle during large engine speed shifts may appear reluctant or even counteractive. To overcome this behaviour, the CVT is augmented with a planetary gear set and compact steel fl ywheel. The new transmission seamlessly combines two contradictive features: the driveability in terms of the pedal-to-wheel response is greatly improved and a large leap towards optimal fuel economy can be made. This can be achieved by cruising the vehicle at extremely low engine speeds which is possible by the large ratio-coverage of the CVT. The latently impassive pedal-to-wheel response that normally would emerge is now eliminated by the gear set and the flywheel. In this paper two control strategies for the engine throttle valve and the CVT ratio shift speed are presented and analysed. The control laws are able to realize high driveability and fuel economy at the same time. Results from simulations will be discussed

Connect & Drive: design and evaluation of cooperative adaptive cruise control for congestion reduction

Road throughput can be increased by driving at small inter-vehicle time gaps. The amplification of velocity disturbances in upstream direction, however, poses limitations to the minimum feasible time gap. This effect is covered by the notion of string stability. String-stable behavior is thus considered an essential requirement for the design of automatic distance control systems, which are needed to allow for safe driving at time gaps well below 1 s. Using wireless inter-vehicle communications to provide real-time information of the preceding vehicle, in addition to the information obtained by common Adaptive Cruise Control (ACC) sensors, appears to significantly decrease the feasible time gap, which is shown by practical experiments with a test fleet consisting of six passenger vehicles. The large-scale deployment of this system, known as Cooperative ACC (CACC), however, poses challenges with respect to the reliability of the wireless communication system. A solution for this scalability problem can be found in decreasing the transmission power and/or beaconing rate, or adapting the communications protocol. Although the main CACC objective is to increase road throughput, the first commercial application of CACC is foreseen to be in truck platooning, since short distance following is expected to yield significant fuel savings in this case

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A Broader View on Electrification: the Example of A Solar Powered Electric Vehicle

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