| 1. |
- Hultén, Johan, 1966, et al.
(författare)
-
Yaw Stability Control System
- 2009
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The present invention relates is a yaw stability control system for a vehicle using a steering system and a method of controlling by detecting the occurrence of understeer, determining the degree of understeer after the occurrence of understeer is detected determining if the determined degree of understeer exceeds a threshold value, saving the steering wheel torque value and steering wheel angle value when determined that a calculated drop in steering wheel torque exceeds the threshold value, calculating a guidance torque, a driver-intended steering wheel angle, and updating the steering wheel angle at the start of the guidance torque calculation, applying the guidance torque to the steering of the vehicle, and using the driver-intended steering wheel angle for yaw stability control.Read more: http://www.faqs.org/patents/app/20090271074#ixzz2qAmWySbh
|
|
| 2. |
- Jonasson, Mats, et al.
(författare)
-
Investigation of the Non-Convex Force Constraints Imposed by Individual Wheel Torque Allocation
- 2009
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- This paper explains the non-convex tyre force constraints on electric vehicles with individual drive. Given demands from a motion planning on a top level from the vehicle hierarchy, the task to allocate forces to each wheel corner is considered as a mapping process from a global vehicle level. One important role of the allocator is to deliver solutions even if the requirements arising from motion planning are not physically feasible. To secure vehicle stability, fundamental allocator requirements are formulated. However, more demands are needed to avoid undesired vehicle behaviors. These demands, which belong tothe optional allocator requirements, are described. Given the force constraints and the allocator requirements, solutions of the allocation problem to four electricalmachines are solved by non-linear programming.
|
|
| 3. |
- Jonasson, Mats, 1969-, et al.
(författare)
-
Modelling and parameterisation of a vehicle for validity under limit handling
- 2008
-
Ingår i: Proceedings of 6th Modelica Conference.
-
Konferensbidrag (refereegranskat)abstract
- This paper describes how a vehicle model from the VehicleDynamics Library is configured, parameterized and validated for predicting limit handling maneuvers. Especially, attention is given to the selection of subsystem models with suitable levels-of-detail as well the selection of performed measurements and measurement equipment. A strong principle throughout the presented work is component-based design where parameterizations are done on sub-system levels, no tuning on the final vehicle models is made. As a final test, the vehicle model is exposed to a sinusoidal steering input. It turns out that the correspondence between the model used and the real vehicle is acceptable for the driving scenario selected up to the limit of adhesion.
|
|
| 4. |
- Jonasson, Mats, et al.
(författare)
-
Utilisation of actuators to improve vehicle stability at the limit: from hydraulic brakes towards electric propulsion
- 2009
-
Ingår i: Proceedings of the 21st International Symposium on Dynamics of Vehicles on Roads and Tracks (IAVSD’09), KTH Stockholm, 17-21 August 2009.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The capability of over-actuated vehicles to maintain stability during limit handling is studied in this paper. A number of important differently actuated vehicles, equipped with hydraulic brakes towards more advanced chassis solutions, are presented. A virtual evaluation environment has specifically been developed to cover the complex interaction between the driver and the vehicle undercontrol. In order to fully exploit the different actuators set-up, and the hard non-convex constraints they possess, the principle of control allocation by nonlinear optimisation is successfully employed. The final evaluation is made by exposing the driver and the over-actuated vehicles to a safety-critical manoeuvre. Thereby, the differently actuated vehicles are ranked by a quantitativeindicator of stability.
|
|
| 5. |
- Lemmen, Markus, et al.
(författare)
-
ROLL STABILITY CONTROL AND ROLL-OVER MITIGATION BY STEERING ACTUATION
- 2007
-
Patent (övrigt vetenskapligt/konstnärligt)abstract
- The invention relates to a method for reducing a risk of or avoiding a roll-over event of a vehicle, having means of an electronic controllable steering system and an electronic control unit. The electronic control unit identifies the occurrence of the roll-over risk, such that control means generate a signal in order to steer the road wheels more into the direction in which the vehicle is tending to roll-over.
|
|
| 6. |
- Lu, Jianbo, et al.
(författare)
-
STABILITY CONTROL SYSTEM WITH BODY-FORCE-DISTURBANCE HEADING CORRECTION
- 2009
-
Annan publikation (övrigt vetenskapligt/konstnärligt)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
|
|
| 7. |
- Lu, Jianbo, et al.
(författare)
-
Yaw stability control system capable of returning the vehicle to a pre body-force-disturbance heading
- 2009
-
Annan publikation (övrigt vetenskapligt/konstnärligt)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.
|
|
| 8. |
- Yang, Derong, 1985, et al.
(författare)
-
Benefit Prediction of Passenger Car Post Impact Stability Control Based on Accident Statistics and Vehicle Dynamics Simulations
- 2009
-
Ingår i: Proceedings of 21st IAVSD Symposium on Dynamics of Vehicles on Roads and Tracks, 2009.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Accident statistics showed that about 30% of passenger car accidents are multiple-impact events (MIE). Current Electronic Stability Control (ESC) systems are well designed for vehicle yaw motion control due to aggressive driving maneuvers, but not for that under external disturbances on the car body. A post impact stability control (PISC) system is thus envisioned to avoid or mitigate the subsequent events after the first PISC-triggering impact. In this work, a method for the benefit prediction of passenger car PISC system is formulated, based on accident statistics and vehicle dynamics simulations. The representative accident cases are selected; the problematic areas in terms of post impact vehicle dynamics are analyzed; thus the benefit measures are determined for each case, taking the accident environmental factors into account. PISC benefit is predicted by quantifications on each benefit measure, using a PISC function that selects between two controllers, i.e. Differential Braking and Lock Front Axle.
|
|
