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Peripheral acceleration sensor Peripheral acceleration sensor Two-channel acceleration sensor Two-channel acceleration sensor Pedestrian contact sensor Pedestrian contact sensor Peripheral pressure sensor Peripheral pressure sensor Pressure tube sensor Pressure tube sensor Peripheral sensor interface Peripheral sensor interface
 

To improve performance and evaluation of the restraint system’s triggering decision, peripheral acceleration sensors can be installed in the vehicle. These sensors are in addition to acceleration sensors already integrated in the airbag control unit.

The peripheral acceleration sensor (PAS) from Bosch provides information on direction and level of impact by measuring accelerations during a crash in one spatial axis.

The acceleration rates are transferred to the airbag control unit via a standardized, digital sensor interface (Peripheral Sensor Interface, PSI5). The vehicle’s restraint systems are only triggered by the airbag control unit, after a plausibility check has been completed. This check is based on the data from the central and peripheral sensors.

The sensor is attached to the vehicle by a single screw, thereby minimizing assembly time at the vehicle manufacturer.

Depending on the installation location in the vehicle, different versions of the peripheral acceleration sensor are available. To detect side impacts, the PAS6 or PAS6 enhanced is mounted on both sides of the vehicle on supporting structural components such as seat crossmembers, sills or the B and C-pillars. The PAS can also be installed in the rear of the vehicle to detect rear impacts.

To further improve front impact detection, special acceleration sensors (upfront sensors, UFS) can be mounted in the crumple zone in the front of the vehicle.

 
 
 
  • Fast detection and classification of front, side and rear impacts
  • Integration of two sensing directions in a single sensor housing (PAS6 enhanced)
  • Small and cost-effective sensor design
  • Less installation effort due to mounting with a single screw
  • Reduced networking requirements due to PSI5 interface
 
 
 

In addition to the peripheral acceleration sensor, Bosch provides a two-channel peripheral acceleration sensor, the PAS6 enhanced, that can record longitudinal and lateral vehicle accelerations. The optional installation of this sensor can further improve the performance of the airbag system as it provides additional acceleration information on the longitudinal direction of the vehicle.

 
 
 
  • Integration of two sensing directions in a single sensor housing
  • Small and cost-effective sensor design
  • Less installation effort due to mounting with a single screw
  • Reduced networking requirements due to PSI5 interface
 
 
 

To better protect pedestrians during a head-on collision, Bosch also provides acceleration sensors, (pedestrian contact sensors, PCS), which are installed in the front bumper to detect whether a pedestrian is involved in the crash. Based on the data from this sensor, the airbag control unit can, for example, lift the hood to create an additional deformation area between the hood and engine block, minimizing the risk of injury to pedestrians.

 
 
 
  • Small and cost-effective sensor design
  • Flexible mounting concept
  • Less installation effort due to mounting with a single screw
  • Reduced networking requirements due to PSI5 interface
 
 
 

Compared to the previous model, the third-generation pressure sensor (PPS3) offers more efficient signal processing for increased system performance as well as an AK-LV29-compatible standard housing that makes it easier to install in the vehicle. The sensor was developed in accordance with ISO standard 26262 for safety-relevant electronic systems in vehicles.

The PPS3 is installed in the door cavity providing fast and robust side impact detection. The sensor continuously measures atmospheric pressure and detects any changes resulting from a deformation of the door. In comparison to central sensors, the PPS3 makes it significantly easier to distinguish between an actual impact and harmless impulses. By means of continuous pressure distribution within the door interior, the entire door acts as a sensory element.

The peripheral pressure sensor is connected to the airbag control unit via a PSI5 interface (peripheral sensor interface) which controls the power supply as well as the transfer of data.

Depending on the vehicle application, two or four peripheral sensor interface are connected to the airbag control unit alongside the peripheral acceleration sensors (PAS) on the supporting structural components. By combining the two physical measurements, a quicker and more reliable deployment decision can be made for passive safety systems. The peripheral acceleration sensors verify the triggering decision more quickly than lateral acceleration sensors integrated into the airbag control unit.

 
 
 
  • Faster airbag deployment in the event of a side impact
  • Robust firing decision in combination with acceleration sensors
  • Small and cost-effective sensor design
  • Flexible mounting concept
  • Reduced networking requirements due to PSI5 interface
  • Certified in accordance with ISO 26262
 
 
 

On the road, pedestrians are particularly at risk, a fact reflected in the high proportion of deaths. In most accidents, the pedestrian collides with the front of the vehicle. Serious injuries can occur if the pedestrian’s head hits the engine hood or other hard structures in the area around the windshield.

The pressure tube sensor from Bosch provides a pressure-based sensor system designed to detect collisions with pedestrians. Bosch has already been using a pedestrian-protection system based on acceleration sensors for many years.

The pressure tube sensor, integrated into the front spoiler of the vehicle, consists of an elastic silicone tube filled with air. Two peripheral pressure sensors are located at each end of the tube. The sensor was developed in accordance with ISO standard 26262 for safety-relevant electronic systems in vehicles.

If the system detects a collision with a pedestrian, it triggers protective mechanisms, such as an active engine hood device or windshield airbag within 10 to 15 milliseconds of the impact. These can absorb the kinetic energy produced by the pedestrian’s head, thereby minimizing the severity of the injuries sustained. The evaluation electronics of the sensor system are integrated into the airbag control unit.

The pressure tube sensor is connected to the airbag control unit via a PSI5 interface (peripheral sensor interface) that controls the power supply as well as the transfer of data.

The tube in the sensor system is fitted along the length of the cross-member in the energy-absorbing foam on the bumper. The pressure sensors at the end of the tube are either screwed directly into the crossbeam, inserted into the energy-absorbing foam, or attached to the bumper overlay.

 
 
 
  • Reliable crash detection and robust deployment triggering based on high levels of resolution and high-quality signals
  • Easy integration into the vehicle
  • Increased versatility in terms of vehicle configuration thanks to the possibility of making flexible adjustments to the chassis style
  • Reduced networking requirements due to PSI5 interface
  • Certified in accordance with ISO 26262
 
 
 

The peripheral sensor interface (PSI5) is an interface for automotive sensor applications. PSI5 is an open standard based on existing sensor interfaces for peripheral airbag sensors, which has been validated already in millions of airbag systems. Main features of the PSI5 sensor interface are high speed and high reliability data transfer at lowest possible implementation overhead. PSI5 covers the requirements of digital automotive interfaces and offers a universal and flexible solution for multiple sensor applications.

 
 
 
 
 

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