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Advanced emergency braking controller design for pedestrian protection oriented automotive collision avoidance system.

Lie G, Zejian R, Pingshu G, Jing C - ScientificWorldJournal (2014)

Bottom Line: Three typical braking scenarios are defined and the safety situations are assessed by comparing the current distance between the host vehicle and the obstacle with the critical braking distance.To reflect the nonlinear time-varying characteristics and control effect of the longitudinal dynamics, the vehicle longitudinal dynamics model is established in CarSim.Cosimulations utilizing CarSim and Simulink are finally carried out on a CarSim intelligent vehicle model to explore the effectiveness of the proposed controller.

View Article: PubMed Central - PubMed

Affiliation: School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China.

ABSTRACT
Automotive collision avoidance system, which aims to enhance the active safety of the vehicle, has become a hot research topic in recent years. However, most of the current systems ignore the active protection of pedestrian and other vulnerable groups in the transportation system. An advanced emergency braking control system is studied by taking into account the pedestrians and the vehicles. Three typical braking scenarios are defined and the safety situations are assessed by comparing the current distance between the host vehicle and the obstacle with the critical braking distance. To reflect the nonlinear time-varying characteristics and control effect of the longitudinal dynamics, the vehicle longitudinal dynamics model is established in CarSim. Then the braking controller with the structure of upper and lower layers is designed based on sliding mode control and the single neuron PID control when confronting deceleration or emergency braking conditions. Cosimulations utilizing CarSim and Simulink are finally carried out on a CarSim intelligent vehicle model to explore the effectiveness of the proposed controller. Results display that the designed controller has a good response in preventing colliding with the front vehicle or pedestrian.

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Related in: MedlinePlus

The vehicle velocity.
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fig13: The vehicle velocity.

Mentions: As shown in Figure 12, the actual braking deceleration reaches the maximum braking deceleration of −8.5 m/s2 immediately at 0.3 s. Some little fluctuations can be observed between 0.3 s and 2 s. At that time, the passengers could feel uncomfortable to some extent. Then the actual braking deceleration drops rapidly and quickly reaches zero. Figure 13 shows that the velocity drops rapidly with maximum braking deceleration, from the initial velocity of 60 km/h to 2 km/h at 2 s, and reaches zero at 2.3 s when the vehicle stops. From Figure 14, we could know that the relative distance of the vehicle and the pedestrian was 25 m at the initial time and gradually tends to the desired relative distance. Finally, the relative distance reached 7.2 m when the host vehicle stops completely.


Advanced emergency braking controller design for pedestrian protection oriented automotive collision avoidance system.

Lie G, Zejian R, Pingshu G, Jing C - ScientificWorldJournal (2014)

The vehicle velocity.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4109130&req=5

fig13: The vehicle velocity.
Mentions: As shown in Figure 12, the actual braking deceleration reaches the maximum braking deceleration of −8.5 m/s2 immediately at 0.3 s. Some little fluctuations can be observed between 0.3 s and 2 s. At that time, the passengers could feel uncomfortable to some extent. Then the actual braking deceleration drops rapidly and quickly reaches zero. Figure 13 shows that the velocity drops rapidly with maximum braking deceleration, from the initial velocity of 60 km/h to 2 km/h at 2 s, and reaches zero at 2.3 s when the vehicle stops. From Figure 14, we could know that the relative distance of the vehicle and the pedestrian was 25 m at the initial time and gradually tends to the desired relative distance. Finally, the relative distance reached 7.2 m when the host vehicle stops completely.

Bottom Line: Three typical braking scenarios are defined and the safety situations are assessed by comparing the current distance between the host vehicle and the obstacle with the critical braking distance.To reflect the nonlinear time-varying characteristics and control effect of the longitudinal dynamics, the vehicle longitudinal dynamics model is established in CarSim.Cosimulations utilizing CarSim and Simulink are finally carried out on a CarSim intelligent vehicle model to explore the effectiveness of the proposed controller.

View Article: PubMed Central - PubMed

Affiliation: School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China.

ABSTRACT
Automotive collision avoidance system, which aims to enhance the active safety of the vehicle, has become a hot research topic in recent years. However, most of the current systems ignore the active protection of pedestrian and other vulnerable groups in the transportation system. An advanced emergency braking control system is studied by taking into account the pedestrians and the vehicles. Three typical braking scenarios are defined and the safety situations are assessed by comparing the current distance between the host vehicle and the obstacle with the critical braking distance. To reflect the nonlinear time-varying characteristics and control effect of the longitudinal dynamics, the vehicle longitudinal dynamics model is established in CarSim. Then the braking controller with the structure of upper and lower layers is designed based on sliding mode control and the single neuron PID control when confronting deceleration or emergency braking conditions. Cosimulations utilizing CarSim and Simulink are finally carried out on a CarSim intelligent vehicle model to explore the effectiveness of the proposed controller. Results display that the designed controller has a good response in preventing colliding with the front vehicle or pedestrian.

Show MeSH
Related in: MedlinePlus