Feedback linearization of spark-ignition engines with continuously variable transmissions

Guzzella, Lino; Schmid, Anne-Christine

doi:10.1109/87.370710

Cited by 46 publications

(94 citation statements)

References 4 publications

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“…If C f is opened, the system reduces to the conventional CVT powertrain, otherwise it is the ZI powertrain. The control of the CVT [30,31] and ZI [12,24,26] powertrain is beyond the scope of this paper.…”

Section: Control Strategy For the Fourth Stagementioning

confidence: 99%

IdleStop and Go: a way to improve fuel economy

Shen

Vroemen

Veldpaus

2006

Vehicle System Dynamics

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This paper proposes a mechanical solution to save fuel by shutting down an internal combustion engine whenever it is unnecessary for propulsion, e.g., when a vehicle is waiting for traffic lights. The engine and vehicle are restarted using the energy that is stored in a flywheel. Two additional clutches are needed to enable appropriate power flow from the flywheel to the engine and vehicle. This complicates the powertrain dynamics in that the number of degrees of freedom changes due to clutch operations. Therefore, a hybrid control strategy, which is treated as a top-level controller, is introduced to deal with this finite-state mechanical system. At the lower level, the engine and clutches are controlled in a coordinated manner such that the vehicle is launched according to the driver's demands. Using a comprehensive powertrain simulation package, the proposed controller is evaluated numerically.

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Section: Control Strategy For the Fourth Stagementioning

confidence: 99%

IdleStop and Go: a way to improve fuel economy

Shen

Vroemen

Veldpaus

2006

Vehicle System Dynamics

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“…Furthermore, it is a non-minimum phase for a certain range of the admissible states. The non-minimum phase (NMP) behaviour is discussed in detail in Guzzella and Schmid (1995), Liu and Stefanopoulou (2002) and Serrarens (2001). It is already shown in Grizzle et al (1994) that for asymptotic tracking of an open set of reference trajectories a system must be minimum phase and have a well-defined relative degree.…”

Section: Control Problemmentioning

confidence: 99%

Non-linear feedback control of the ZI powertrain

Serrarens¹,

Vijlbrief²,

Steinbuch³

2005

IJVD

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A control law is derived for the Zero-Inertia (ZI) powertrain, a non-linear system with an ill-defined relative degree. Classical non-linear feedback control of this system is impossible. The control law designed in this article uses approximate input-output linearisation. Stability of the closed loop system is proved using Lyapunov's direct method and the theorem of Hartman-Grobman. Simulations show that the new control law results in good tracking behaviour.

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“…The fuel mass flow per unit engine power in stationary situations strongly depends on the operating point, i.e., on the engine speed and the torque or, alternatively, on and the throttle opening . The fuel efficiency in stationary situations can be improved by operating the engine along the E-line, being the set of operating points in which a required engine power is delivered with minimal fuel consumption ( [11], [18], [36], [41], [45]). Some papers [30], [33] not only take into account the efficiency of the engine but also of other powertrain components (torque converter, transmission, etc.).…”

mentioning

confidence: 99%

“…The CVT and throttle controllers [1], [7], [11], [21], [35], [45], [49], aim to operate the engine in stationary situations in points on or close to the OOL. In general, the engine speed in these points is low (large CVT ratio) and the engine torque is high (large throttle opening), meaning that the power reserve (the difference between the power in the chosen operating point and the power at the same engine speed with a wide open throttle) is small.…”

mentioning

confidence: 99%

Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

Shen

Veldpaus

2004

IEEE Trans. Contr. Syst. Technol.

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Abstract-Vehicular powertrains with an internal combustion engine, an electronic throttle valve, and a continuously variable transmission (CVT) offer much freedom in controlling the engine speed and torque. This can be used to improve fuel economy by operating the engine in fuel-optimal operating points. The main drawbacks of this approach are the low driveability and, possibly, an inverse response of the vehicle acceleration after a kick-down of the drive pedal. This paper analyzes a concept for a novel powertrain with an additional flywheel. The flywheel plays a part only in transient situations by (partly) compensating the engine inertia, making it possible to optimize fuel economy in stationary situations without loosing driveability in transients. Two control strategies are discussed. The first one focuses on the engine and combines feedback linearization with proportional control of the CVT ratio. The CVT controller has to be combined with an engine torque controller. Three possibilities for this controller are discussed. In the second strategy, focusing on control of the vehicle speed, a bifurcation occurs whenever a downshift of the CVT to the minimum ratio is demanded. Some methods to overcome this problem are introduced. All controllers are designed, using a simple model of the powertrain.

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Feedback linearization of spark-ignition engines with continuously variable transmissions

Cited by 46 publications

References 4 publications

IdleStop and Go: a way to improve fuel economy

IdleStop and Go: a way to improve fuel economy

Non-linear feedback control of the ZI powertrain

Analysis and Control of a Flywheel Hybrid Vehicular Powertrain

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