| 1. |
- Andersson, Ingemar, 1969, et al.
(author)
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Evaluation of a Closed Loop Spark Advance Controller Based on a Torque Sensor
- 2008
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In: SAE Technical Papers. - : SAE International. - 0148-7191 .- 2688-3627.
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Journal article (peer-reviewed)abstract
- A closed loop spark advance control system was evaluated on a Volvo V70 5-cylinder spark ignited engine. The system utilises a crankshaft mounted torque sensor for combustion monitoring which provides individual cylinder combustion phasing information and enables individual cylinder spark advance control. The spark advance control system can compensate for changes in combustion operating conditions and hence limit the need for calibration. The spark advance control system was used in a mode of cylinder balancing where the control target is to keep the combustion phasing in all cylinders at a defined setpoint. This control law was evaluated in vehicle tests in an emission test chamber, running pre-defined driving cycles FTP72 and Highway Fuel Economy Test. Analysis shows that the combustion phasing was kept close to the selected setpoint during both tests and, hence, robustness in that sense was demonstrated. The torque ratio concept is used for combustion phasing monitoring based on crankshaft torque measurements. Analysis of the 50% torque ratio as a measure for combustion phasing shows that it is equivalent to 50% burned mass fraction.
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| 2. |
- Andersson, Ingemar, 1969, et al.
(author)
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The torque ratio concept for combustion monitoring of internal combustion engines
- 2012
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In: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 20:6, s. 561-568
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Journal article (peer-reviewed)abstract
- This work presents a method to analyze combustion events in an internal combustion engine, called the torque ratio concept. The method is based on crankshafttorque measurements, but an extension to angular speed measurements is possible. The torque ratio concept provides a parametrized model for the combustionprogress from which e.g. combustion phasing can be extracted. The torque ratio concept is derived mathematically and related theoretically to other combustionanalysis methods, such as pressure ratio and net heat release. Finally, analysis on recorded data from a five cylinder spark ignited engine verifies the relationships between the three methods. For combustion phasing, the 50% torque ratio is an equivalent measure to 50% pressure ratio and can be transformed into the 50% net heat release position by using a derived volume ratio function.
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| 3. |
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| 4. |
- Jonasson, Mats, 1969, et al.
(author)
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Steering Redundancy for Self-Driving Vehicles using Differential Braking
- 2018
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In: Vehicle System Dynamics. - : Informa UK Limited. - 1744-5159 .- 0042-3114. ; 56:5, s. 791-809
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Journal article (peer-reviewed)abstract
- This paper describes how differential braking can be used to turn a vehicle in the context of providing fail-operational control for self-driving vehicles. Two vehicle models are developed with differential input. The models are used to explain the bounds of curvature that differential braking provides and they are then validated with measurements in a test vehicle. Particular focus is paid on wheel suspension effects that significantly influence the obtained curvature. The vehicle behaviour and its limitations due to wheel suspension effects are, owing to the vehicle models, defined and explained. Finally, a model-based controller is developed to control the vehicle curvature during a fault by differential braking. The controller is designed to compensate for wheel angle disturbance that is likely to occur during the control event.
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| 5. |
- Lu, Jianbo, et al.
(author)
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STABILITY CONTROL SYSTEM WITH BODY-FORCE-DISTURBANCE HEADING CORRECTION
- 2009
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Other publication (other academic/artistic)abstract
- A yaw stability control system for a vehicle detects and eliminates the vehicle yaw angle resulting from a body-force-disturbance and returns the vehicle to a pre disturbance heading. A yaw rate module generates a signal indicative of the vehicle yaw rate error. A yaw angle error module is triggered in response to a body-force-disturbance being detected by a body-force-disturbance detection unit, and performs integrations of the yaw rate signals to calculate a yaw angle error in order to obtain a correction of the vehicle yaw angle resulting from the body-force-disturbance. A yaw control module uses the yaw angle error in combination with the yaw rate error for a limited time period to generate yaw control signals that are sent to the vehicle brakes and/or active steering system for performing vehicle yaw stability control operations a signal to perform a body-force-disturbance yaw stability control operation for.Read more: http://www.faqs.org/patents/app/20090271073#ixzz2qAju8nV6
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| 6. |
- Lu, Jianbo, et al.
(author)
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Yaw stability control system capable of returning the vehicle to a pre body-force-disturbance heading
- 2015
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Patent (other academic/artistic)abstract
- The present invention relates to a yaw stability control system for a vehicle. At least one yaw rate sensor (5) is arranged to generate a signal indicative of the vehicle yaw rate. A controller is responsive to a yaw rate error. The controller is arranged to activate yaw angle control part (1) of the controller, in response to a body-force-disturbance being detected by at least one body-force-disturbance detection unit (7), and to start performing control of the yaw angle error in order to obtain a correction of the vehicle yaw angle resulting from the body-force-disturbance, and input to the system for performing vehicle yaw stability control operations (6) a signal to perform a body-force-disturbance yaw stability control operation for eliminating the vehicle yaw angle resulting from the body-force-disturbance and returning the vehicle to a pre body-force-disturbance heading.
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| 7. |
- Lu, Jianbo, et al.
(author)
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Yaw stability control system capable of returning the vehicle to a pre body-force-disturbance heading
- 2009
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Other publication (other academic/artistic)abstract
- The present invention relates to a yaw stability control system for a vehicle. At least one yaw rate sensor (5) is arranged to generate a signal indicative of the vehicle yaw rate. A controller is responsive to a yaw rate error. The controller is arranged to activate yaw angle control part (1) of the controller, in response to a body-force-disturbance being detected by at least one body-force-disturbance detection unit (7), and to start performing control of the yaw angle error in order to obtain a correction of the vehicle yaw angle resulting from the body-force-disturbance, and input to the system for performing vehicle yaw stability control operations (6) a signal to perform a body-force-disturbance yaw stability control operation for eliminating the vehicle yaw angle resulting from the body-force-disturbance and returning the vehicle to a pre body-force-disturbance heading.
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| 8. |
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| 9. |
- Thor, Mikael, 1982, et al.
(author)
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Closed-loop diesel engine combustion phasing control based on crankshaft torque measurements
- 2014
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In: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 33, s. 115-124
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Journal article (peer-reviewed)abstract
- Methods for closed-loop combustion phasing control in a diesel engine, based on measurements of crankshaft torque, are developed and evaluated. A model-based method for estimation of cylinder individual torque contributions from the crankshaft torque measurements is explained and a novel approach for identification of crankshaft dynamics is proposed. The use of the combustion net torque concept for combustion phasing estimation in the torque domain is also described. Two different control schemes, one for individual cylinder control and one for average cylinder control, are studied. The proposed methods are experimentally evaluated using a light-duty diesel engine equipped with a crankshaft integrated torque sensor. The results indicate that it is possible to estimate and control on a cylinder individual basis using the measurements from the crankshaft torque sensor. Combustion phasing is estimated with bias levels of less than 0.5 crank angle degrees (CAD) and cycle-to-cycle standard deviations of less than 0.7 CAD for all cylinders and the implemented combustion phasing controllers manage to accurately counteract disturbances in both fuel injection timing and EGR fraction.
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| 10. |
- Thor, Mikael, 1982, et al.
(author)
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Estimation of Combustion Phasing Using the Combustion Net Torque Method
- 2011
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In: IFAC Proceedings Volumes (IFAC-PapersOnline). - 2405-8963. - 9783902661937 ; 18:PART 1, s. 11827-11832
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Conference paper (peer-reviewed)abstract
- A new and computationally efficient method, called the combustion net torque method, for estimating combustion phasing in an internal combustion engine using crankshaft torque data is presented. The work is motivated by the need of such an estimation method for real-time implementation of a torque based closed-loop combustion phasing control system. The ideal properties of the proposed method, based on torque calculated from cylinder pressure, are studied using simulations and experimental data from both a spark ignited and a compression ignited engine. A relation to 50% burned mass fraction, the most common measure of combustion phasing, is established and the robustness of the method is investigated. The results show that the ideal estimation accuracy of the proposed method is high, especially around the combustion phasing position where maximum engine efficiency is achieved. Also, the computational complexity of the combustion net torque method is significantly lower compared to other existing techniques for torque domain combustion phasing estimation.
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