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## 7.4 Driveline Speed Control

The background and problems with traditional diesel engine speed control (RQV) were covered in Section 7.3. Driveline speed control is here defined as the extension of RQV control with engine controlled active damping of driveline resonances. Active damping is obtained by using a feedback law that calculates the fuel amount so that the engine inertia works in the opposite direction of the oscillations, at the same time as the desired speed is obtained. The calculated fuel amount is a function of the engine speed, the wheel speed, and the drive-shaft torsion, which are states of the Drive-shaft model, derived in Section 7.1. These variables are estimated by a Kalman filter with either the engine speed or the wheel speed as input. The feedback law is designed by deriving a criterion in which the control problem is given a mathematical formulation.

The RQV control scheme gives a specific character to the driving feeling e.g., when going uphill and downhill. This driving character is possible to maintain when extending RQV control with active damping. Traditional RQV control is further explained in Section 7.4.1. Thereafter, the speed control problem keeping RQV characteristics is formulated in Section 7.4.2. The problem formulation is then studied in the following sections. The design based on the Drive-shaft model is simulated together with the more complicated Nonlinear clutch and drive-shaft model as vehicle model. Some important disturbances are simulated that are difficult to generate in systematic ways in real experiments. Finally,...

##### Products & Services
Fluid Couplings
Fluid couplings are torque-transmitting couplings that use hydraulic oil or water to transmit power. They differ from torque converters in that the input torque is equal to the output torque (no multiplication of torque).
Adjustable speed drives alter the speed of a driven shaft to a speed selected by an operator.
Dynamometers
Dynamometers are used in motor and engine testing. These devices apply braking or drag resistance to rotation, and measure torque at various speeds and power input levels.
Gearboxes and gearheads, also called gear reducers or speed reducers, are power transmission devices that use a gear arrangement in an enclosed housing to transfer energy, increase torque and reduce speed from one device to another. Gearboxes may also be referred to as gear reducers or speed reducers.
Variable Transmissions
Variable transmissions are used in industrial applications to alter the speed of an output shaft.

##### Topics of Interest

7.5 Driveline Control for Gear-Shifting Gear shifting by engine control realizes fast gear shifts by controlling the engine instead of sliding the clutch to a torque-free state in the transmission,...

7.6 Anti-Jerking Control for Passenger Cars In recent years the engine torque of Diesel engines has been increasing rapidly also for personal cars. Thereby, like for trucks, problems for...

7.1 Driveline Modeling A vehicular power train consists of engine and driveline. The main parts of the driveline are clutch, transmission, shafts and wheels. The driveline is a fundamental part of a...

7.2 Modeling of Neutral Gear An important basis for design of driveline management is to understand the dynamic behavior of the driveline before and after going from a gear to neutral. This requires...

4.3 Sizing the power electronics All of the electrical power directed to the hybrid propulsion M/G must pass through the power electronics. It has been said that control electronics uses power to...

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