Authors: Arsie, Ivan, Di Martino, Raffaele, Rizzo, Gianfranco, Sorrentino, Marco

Abstract: A study on optimal energy management on a hybrid solar vehicle (HSV) with series structure is presented. Previous results obtained by optimal design analysis for HSV have confirmed the relevant benefits of such vehicles with respect to conventional cars in case of intermittent use in urban driving (city-car), and that economical feasibility could be achieved in a near future. In order to develop a supervisory control for a HSV prototype now under development at University of Salerno, a study on the performance achievable by an intermittent use of the ICE powering the electric generator is presented. In particular, the effects of engine thermal transient on fuel consumption are studied and discussed. The optimal ICE power trajectory is found by solving a non-linear constrained optimization that suitably accounts for fuel mileage and state of charge, also considering solar contribution during parking mode.

Keywords: engine modeling,engine control,optimization,hybrid vehicles,solar energy

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Suzuki, Masahiro, Tomita, Kazuhiro, Raksincharoensak, Pongsathorn, Michitsuji, Yohei, Nagai, Masao

Abstract: In this paper, longitudinal vehicle dynamics of light duty hybrid truck and driver following the preceding vehicle are modeled by using experimental data of the actual target vehicle and driving simulator. Then, the problem that concerns the increase of fuel consumption is clarified by theoretical analysis using computer simulation which include both two above-mentioned models, the vehicle and the driver, as driver-vehicle system. Finally the control method of hybrid system is proposed by considering driver pedal operation characteristics to improve fuel economy in vehicle following situation.

Keywords: vehicle dynamics,hybrid computers,hybrid vehicles,simulation,driver models,driver behaviour

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Salfeld, Maike, Stabrey, Stephan, Trachtler, Ansgar

Abstract: This paper explores vehicle dynamics in skid maneuvers. First, modeling of vehicle dynamics in skid maneuvers is discussed and a vehicle model suited for the situation is developed. The model is used for analyzing the theoretical maximum stabilizing yaw moment, which can be generated in skidding by vehicle control systems. The maximum yaw moment is found by optimization in an exemplary skid maneuver. From analysis of the results, di(r)erent underlying physical principles that govern yaw moment generation can be revealed. The sensitivity of the optimization results is analyzed by varying the vehicle geometry and tire force characteristics.

Keywords: vehicle dynamics,automotive control,traction yaw control,inverse dynamic problem,control allocation,antiskid control

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Shahbakhti, Mahdi, Lupul, Robert, Koch, Charles Robert

Abstract: To control auto-ignition timing in a Homogeneous Charge Compression Ignition (HCCI) engine, it is essential to be able to predict the auto-ignition timing. Since charge properties influence the auto-ignition timing, a control-oriented model is further developed to predict the HCCI auto-ignition timing and the sensitivity to the charge properties is examined. The simulation results show that in the studied range the Start of Combustion (SOC) is the most sensitive to the variation of charge temperature and the least sensitive to the variation of Exhaust Gas Recirculation (EGR) rate and the sensitivity to charge temperature increases with decreasing EGR rate.

Keywords: HCCI,auto-ignition,sensitivity analysis

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Muske, Kenneth R., Jones, James C. Peyton, Makki, Imad H., Uhrich, Michael J., Howse, James W.

Abstract: An integrated, model-based methodology for three-way automotive catalyst control and diagnostic monitoring utilizing a limited integrator model with an adaptive integral gain is outlined in this work. This adaptive gain, which is a measure of the catalyst oxygen storage capacity, is used both by the controller to provide information on the dynamic catalyst behavior and by the diagnostic monitor to provide information on long-term catalyst deactivation and short-term emission control device failure. Nonparametric test statistics using various metrics computed from a moving window sample of the adaptive gain are compared to determine their ability to detect changes in catalyst system performance with a number of differently aged catalysts. These diagnostic monitoring metrics have been applied to 4.6 liter ULEV II gasoline engine data tested over an EPA Federal Test Procedure drive cycle.

Keywords: automotive catalyst monitoring,automotive catalyst on-board diagnostic

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Switkes, Joshua P., Gerdes, J. Christian, Schmidt, Gerrit F., Kiss, Miklos

Abstract: This paper describes the design and results of a user study to investigate the driver's response to torque disturbances on the vehicle handwheel. These disturbances can result from malfunctions in steering-based driver assistance systems such as lanekeeping. To guarantee the safety of these types of systems, it is vitally important to know the response of the driver-vehicle system when there is such a torque disturbance. This includes both how the driver detects the disturbance as well as what the response is. The design of handwheel torque for lanekeeping assistance has been the focus of some research, but the response of the driver to a torque disturbance has not been investigated. To this end, 18 users are tested in an experimental vehicle during highway driving situations to determine safety limits of additional handwheel torque. With various amplitudes and shapes of torques applied, the driver response is measured through the movement of the handwheel and the vehicle. Initial results suggest that for slowly increasing torques, the response of the driver is independent of the final amplitude. Presence in a turn has an effect on steering response and on the driver's rating of the car's reaction from the additional torque. No significant difference in the handwheel motion was found between the groups of older and younger users.

Keywords: torque disturbance,human factors,haptic signals,lanekeeping

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Ravi, Nikhil, Roelle, Matthew J., Jungkunz, Adam F., Gerdes, J. Christian

Abstract: This paper presents an approach to model-based controller development for Homogeneous Charge Compression Ignition (HCCI). The control strategy for HCCI is based on a physical two state discrete time model of the process. As the trapped exhaust is pivotal in setting up the cyclic coupling, its temperature and the amount of oxygen present in it are selected as the states of the system. The model is linearized about an operating point in order to generate simple linear controllers. The states of the model, however, are not directly measurable. Hence an observer is used to generate estimates of the states, which are then used by a controller to track a desired system trajectory. Results from simulation show that the system can be controlled with some error about an operating point. Experimental results demonstrate comparable tracking, along with a reduction in the cycle-to-cycle variability of HCCI.

Keywords: HCCI,model based control,HCCI model states

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Walter, Andreas, Brummund, Stephan, Merz, Benedikt, Kiencke, Uwe, Jones, Stephen, Winkler, Thomas

Abstract: Today, in many passenger cars and light trucks, the conventional driveline is extended by a dual mass flywheel (DMF). The DMF reduces driveline oscillations by mechanically decoupling the crankshaft and the transmission. Existing engine control systems are designed for conventional single mass flywheel (SMF) systems. In the future, to facilitate the optimal control of engines equipped with advanced DMF systems, such conventional control systems may require adaptation, modification or even replacement. In this approach, a method for estimating the instantaneous engine torque of vehicles with conventional combustion engines and dual mass flywheel is introduced. The reconstructed engine torque can be used advantageously for advanced controller designs (e.g. cylinder balancing, misfire detection, anti-jerk control, etc.) as well as for analysing the current state of the combustion engine regarding injection time and quantity, combustion quality, incylinder pressure, etc.

Keywords: dual mass flywheel,DMF,engine torque estimation,combustion engine,state space model,state-server,instantaneous engine torque,drive line

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: von Vietinghoff, Anne, Kiencke, Uwe

Abstract: A gain scheduling control concept for the lateral vehicle dynamics is presented. Based on a nonlinear state space model, a controller is derived combining active front and rear wheel steering with individual wheel braking. The control concept proposed is based on a family of linear state feedback controllers. Thereto, the nonlinear model is linearized around a collection of equilibrium points. Depending on the current driving situation, the nearest equilibrium is determined and the corresponding controller gain is chosen. In order to investigate the efficiency of the individual actuators, several controller configurations are derived and compared. The nonlinear process model and the control concepts are validated with a commercial simulation tool for virtual test driving.

Keywords: automotive control,vehicle stability,nonlinear,gain scheduling control

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Rupp, D., Onder, Ch., Guzzella, L.

Abstract: This paper addresses the air-fuel (A/F) ratio control of an SI engine with a wide-range lambda sensor whose time constant may change during operation. For the feedback control of the A/F ratio, an internal model controller (IMC) is employed. Based on the concept of iterative feedback tuning (IFT), the current value of the sensor time constant needed for the adaptation of the IMC-controller is found by doing well-predefined experiments on the closed-loop control system. The effectiveness of this method is demonstrated with simulations and real experiments on an engine test bench.

Keywords: automotive control,air-fuel ratio,adaptive control,iterative feedback tuning,internal model control,identification for control

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Lamy, Christophe, Caroux, Julien, Basset, Michel, Gissinger, Gerard-Leon, Poli, Damien, Romieu, Pierre

Abstract: In order to improve the lateral behavior modeling of a road vehicle, an accurate determination of tire slip angle is needed (typically an accuracy close to 0.1°). In this paper, first, we compare two industrial sensors delivering information of sideslip angle: an optical sensor and a GPS/INS sensor. For this purpose, a specific test bench was developed. The limits of both sensors with regard to the above mentioned precision requirement, are studied, as well for static as for dynamic vehicle maneuvres. Secondly, for the GPS/INS sensor giving better results, we investigate the possibility of direct tire slip angle measurement by mounting this sensor in a plane parallel to the wheel rim. The developed mechanical adapter suffers from an inherent drawback for this kind of mounting, in terms of additional movements, compared to commonly used optical sensors. In spite of this supplementary perturbation, we show that the GPS/INS sensor precision is still better than the optical sensor's.

Keywords: vehicle dynamics,tires,precision measurements,global positioning systems

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Karlsson, Maria, Ekholm, Kent, Strandh, Petter, Johansson, Rolf, Tunestal, Per, Johansson, Bengt

Abstract: A homogeneous charge compression ignition (HCCI) engine requires closed-loop control of combustion phasing for reliable operation. Variable valve actuation (VVA) has previously been shown to enable cycle-to-cycle, cylinder-individual control with high precision, but suffers from a narrow operating range. Adding variable exhaust gas recirculation (EGR) to the closed-loop control structure can extend the operating range. A mid-ranging control structure is presented here for combined VVA and EGR actuations in a multi-cylinder engine. The control structure is simple to implement and preserves the fast, cylinder-individual, and precise actuation of the VVA system while extending the operating range. Experimental results verify the performance of the control structure.

Keywords: mid-ranging control,HCCI,EGR,VVA

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Wesemeier, Daniel, Isermann, Rolf

Abstract: Using the velocity dependent static gain of the one track model it is shown how different unknown parameters and special combinations can be estimated. After discussing different driving maneuvers for vehicle excitation the estimation method is described and applied to a test vehicle for two parameter combinations including the cornering stiffness and the position of the center of gravity. The result is evaluated by simulations with stationary as well as dynamic driving maneuvers.

Keywords: vehicle dynamics,cornering stiffness,one track model,identification,least squares estimation,adaptive systems,static gain,circular driving maneuver

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Wahlstrom, Johan, Eriksson, Lars

Abstract: A static non-linear compensator, that handles a sign reversal and a nonminimum phase behavior in diesel engines, is investigated. It inverts the EGR-flow model and is used in an inner loop in a control structure for coordinated control of EGR-fraction and oxygen/fuel ratio λO. An investigation of the advantages with the proposed non-linear compensator shows less overshoots in λO and less pumping work compared to a control structure without a non-linear compensator. Simulations also quantifies how much the control performance can be improved if an ideal EGR-actuator is used. The result is that the mean absolute EGR error can be reduced with 95%.

Keywords: sign reversal,non-minimum phase behavior

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Sanketi, Pannag R., Zavala, J. Carlos, Wilcutts, M., Kaga, T., Hedrick, J. K.

Abstract: The problem of controlling spark ignition engine emissions during the coldstart period is addressed by designing a model-based MIMO sliding mode controller. The task of the controller is to track a given set of desired profiles of engine-out hydrocarbon (HC) emissions and catalyst temperature using spark timing and fuel injection rate as the inputs. The throttle is not used as a control input. The models used for control design are presented in another paper submitted to the same conference. Different profiles of desired engine-out raw HC and catalyst temperatures are used to analyze the coldstart control problem. Simulation results illustrate the trade-off between low raw HC and fast catalyst ligh-off. It was found that the controller tracks the desired profiles as long as the inputs were not saturated. The controller presented here could be used as a tool to investigate the optimal input profiles. Experiments are being carried out to validate the simulations. Submitted to Fifth IFAC Symposium on Advances in Automotive Control.

Keywords: coldstart,model based control,MIMO sliding control

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Cerone, Vito, Milanese, Mario, Regruto, Diego

Abstract: In this paper we address the problem of combining automatic lane keeping and driver's steering for either obstacle avoidance or lane change maneuvers for passing purpose or any other desired maneuvers, through a closed loop control strategy. The automatic lane keeping control loop is never opened, and no on/off switching strategy is used. During the driver's maneuver, the vehicle lateral dynamics is controlled by the driver himself through the vehicle steering system. When there is no driver's steering action, the vehicle center of gravity tracks the center of the travelling lane thanks to the automatic lane keeping system. At the beginning (end) of the maneuver, the lane keeping task is released (resumed) safely and smoothly. The performance of the proposed closed loop structure is shown by means of simulations and through experimental results obtained along italian highways.

Keywords: vehicle lateral control,automatic lane keeping,driver's steering

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Le Solliec, G., Chauvin, J., Corde, G.

Abstract: The paper presents the development of air path control for a downsized SI engine, from simulation design to validation on a demonstration car. One main issue to reach performance, fuel consumption and pollutant emissions demands is in-cylinder masses observation and control. A simulation-based approach is first presented to design accurate observers from a reference simulator. In this project, a multivariable and non-linear control has been developed, targeting in-cylinder masses trajectories. Finally, the complete torque-based engine control has been integrated on vehicle.

Keywords: downsized SI engine,air path control,observer

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Gupta, Vishisht, Brennan, Sean

Abstract: A novel method for estimating vehicle roll, pitch and yaw using machine vision and inertial sensors is presented that is based on matching images captured from an on-vehicle camera to a rendered representation of the surrounding terrain obtained from an on-board map database. United States Geographical Survey Digital Elevation Maps (DEMs) were used to create a 3D topology map of the geography surrounding the vehicle, and it is assumed in this work that large segments of the surrounding terrain are visible, particularly the horizon lines. The horizon lines seen in the captured video from the vehicle are compared to the horizon lines obtained from a rendered geography, allowing absolute comparisons between rendered and actual scene in roll, pitch and yaw. A kinematic Kalman filter modeling an inertial navigation system then uses the scene matching to generate filtered estimates of orientation. Experiments using an instrumented vehicle operating at the test track of the Pennsylvania Transportation Institute were performed to check the validity of the method, and the results reveal a very close match between the vision-based estimates of orientation versus those from a high-quality GPS/INS system.

Keywords: terrain aided localization,inertial navigation,Kalman filter

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Gaspar, P., Szabo, Z., Bokor, J., Poussot-Vassal, C., Sename, O., Dugard, L.

Abstract: A control structure that integrates active suspensions and an active brake is proposed to improve the safety of vehicles. The design is based on an H∞ control synthesis extended to LPV systems and uses a parameter dependent Lyapunov function. In an emergency, such as an imminent rollover, the safety requirement overwrites the passenger comfort demand by tuning the performance weighting functions associated with the suspension systems. If the emergency persists active braking is applied to reduce the effects of the lateral load transfers and thus the rollover risk. The solution is facilitated by using the actual values of the so-called normalized lateral load transfer as a scheduling variable of the integrated control design. The applicability of the method is demonstrated through a complex simulation example containing vehicle maneuvers.

Keywords: LPV modeling and control,performance specifications,uncertainty,safety operation,passenger comfort,automotive

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Giansetti, P., Colin, G., Chamaillard, Y., Higelin, P.

Abstract: To meet future pollutant emissions standards, it is crucial to be able to estimate the cycle by cycle in-cylinder mass and the composition of the combustion chamber charge. This charge consists of residual gas from the previous cycle, fresh air and fuel. Consequently, the estimation of the fresh air mass based on total in-cylinder mass is a function of the residual gas fraction. This estimation is essential to compute the fuel mass to be injected. This paper proposes two observers, based on a physical approach, that estimate the in-cylinder mass and composition using the cylinder pressure. To test the estimator, several parameters are varied, especially the cylinder pressure offset compensation and the exhaust gases temperature.

Keywords: cylinder pressure,estimation algorithm,in-cylinder mass estimation,residual gases,SI engine control

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Lusso, R., Jensen, M., Walters, E., Wagner, J., Alexander, K.

Abstract: The entrapment of humans and animals in stationary automobiles can lead to heat stroke and death, especially for young children and infants. The introduction of an occupant warning system would significantly reduce the occurrence of fatal entrapment. In this paper, a smart monitoring system will be integrated into a child safety seat and interfaced with its accompanying vehicle. The primary function of this device is to offer a warning if the child restraint contains an occupant, interior temperature is elevated, and the elapsed time within the automobile approaches a dangerous threshold. Specifically, an occupant detector circuit built into the child restraint certifies the presence of a passenger while a sensor monitors cabin temperature. Using an automobile's interior temperature profile, the system is capable of accurately determining the level of danger presented to entrapped passengers. This ensures that the smart child restraint system can decisively activate warning and rescue devices such as hazard lights, horn, power windows, seat fan, and tele-communication equipment. To assist in system calibration efforts, summer weather testing has been completed to explore cabin heating transients.

Keywords: driver warning systems,driver assistance,control architectures

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Desrosiers, Dana, Birdsong, Charles, Schuster, Peter

Abstract: This paper describes a software simulator for pre-crash collision predictions. The simulator is a surrogate test bed for evaluating the performance of proposed pre-crash algorithms. It reads data from a file, transfers distance and angular position of a target to a test algorithm, and then records the algorithm's predictions. To illustrate the simulator functionality, a simplified test algorithm is also described. This algorithm predicts collision risks based on assumptions about the size and acceleration of a target object, and the turning and braking limits of the host vehicle. The test algorithm is shown to be effective for cases where both the vehicle and the target move along straight lines but less effective for curved paths. This result is typical of the difficulty in predicting the future position of another vehicle when its motion may change suddenly in the short time before a crash event.

Keywords: algorithms,computer simulation,automotive control,impact,sensor systems,pre-crash,automotive safety

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Schreiber, Alexander, Isermann, Rolf

Abstract: The optimized control of combustion engines with regard to minimized fuel consumption and emissions requires nonlinear models. Because of an increase of control inputs, like fuel mass flow, injection angle, exhaust gas recirculation flow and several outputs like torque, nitrogen oxides (NOx), hydrocarbons (HC) and particulates the classical grid-based measurement techniques take too long time and do not include dynamics. Therefore different measurement strategies for the stationary and dynamic behavior are described, like Design of Experiments (DoE) and use of suitable neural networks and Pseudo-Random-Binary-Signals (PRBS). As the structure of the models is not precisely known a-priori, nonlinear identification methods in form of special versions of neural networks are good candidates. Therefore, it will be shown how with special amplitude-modulated pseudo random binary signals (APRBS), simultaneous excitation of several input signals, nonlinear multi-input multi-output models can be obtained in relatively short time.

Keywords: engine modeling,nonlinear models,neural networks,dynamic modeling,test generation

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Sahlholm, Per, Jansson, Henrik, Kozica, Ermin, Johansson, Karl Henrik

Abstract: Emerging driver assistance systems, such as look-ahead cruise controllers for heavy duty vehicles, require high precision digital maps. This contribution presents a road grade estimation algorithm for fusion of GPS and vehicle real-time sensor data, with measurements from previous runs over the same road segment. The resulting road grade estimate is thus enhanced using measurements from additional traversals of known roads. Distributed data fusion is utilized to ensure that the storage requirement of known roads does not increase when additional measurements are processed. The implemented algorithm, which is based on extended Kalman filtering and smoothing, is described in detail. Experiments on a Scania test vehicle show the advantages and some of the challenges with the proposed approach.

Keywords: road grade estimation,digital maps,GPS,Kalman filter,sensor fusion

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007

Authors: Froberg, Anders, Nielsen, Lars

Abstract: The problem of minimizing fuel consumption for heavy trucks by optimal control of engine fueling and gear choice is studied. This is done by the use of a realistic truck model with prediction ability of fuel consumption. The effect of non-linearities in the engine characteristics is studied by the use of piece wise affine models. This is an extension to earlier work and allows for a more detailed study of how engine characteristics influence the optimal speed profile. The optimal choice of gear ratio is studied, and it is shown how the choice is affected by engine characteristics, especially by engine maximum torque characteristics.

Keywords: driveline control,optimal control,engine control,optimal gear ratio

Identifier: None

Conference: Fifth IFAC Symposium on Advances in Automotive Control (2007)

Location: Seascape Resort, USA

Start Date: Mon Aug 20 2007 - End Date: Wed Aug 22 2007