Device Description

0985-EX-ST-2012 Text Documents

Honeywell International Inc.

2012-12-17ELS_132011

Chassis Systems Control LRR3: 3rd generation Long-Range Radar Sensor Operating principle The main task of the radar sensor is to detect objects and measure their velocity and position relative to the movement of the host radar-equipped vehicle. To do this, the sensor has four antenna elements that simul- taneously transmit radar waves in the frequency range between 76 and 77 GHz. These waves are reflected by objects in front of the vehicle. By comparing the ampli- tudes and phases of the signal echo received by the antenna elements, conclusions about the objects’ po­- sition can be drawn. The relative speed of objects is measured using Doppler effect (shift in frequency be- tween the reflected and transmitted signals) and dis- tance to the object can be determined by the time lag. Mechanical sensor design The robust sensor design without any mechanically moving parts and its high mechanical vibration resis- Customer benefits tance allows the application in commercial vehicles,  Best-in-class price performance ratio by using particularly in heavy trucks. An optional lens and cost-effective SiGe technology radome heating is implemented to allow full sensor  Excellent measurement accuracy and object performance even under bad weather conditions separation capability (velocity, angle, distance) (snow and ice). Important parameters and interfaces  Sensor performance unaffected by harsh weather such as field of view (opening angle), the configuration conditions (snow and ice) due to optional lens and of the car connector and the position of the mirror for radome heating the optical sensor alignment can be customized.  Adjustable detection range via modification of the focusing element (lens aperture) Standardized manufacturing processes and the usage  Scalable system performance with multiple sensor of fully automotive qualified electronic devices (ac- configurations including sensor data fusion cording to AEC Q100) guarantee the best quality and  Robust sensor design allows application even reliability. The cost-effective design encourages appli- in heavy commercial vehicles cation in all segments. It also makes advanced driver  CAN and FlexRay interfaces allow for easy assistance systems with multiple sensor configurations integration into the vehicle (complementary or redundant) economically viable.

Chassis Systems Control | Long-Range Radar Sensor LRR3 Technical features design enables a detection range of 0.5 up to 250 m Frequency range 76…77 GHz with a field of view of 30°. The field of view can be cus- Distance 0.5…250 m tomized to an opening angle up to 45° by modifying Accuracy ±0.1 m the aperture of the lens. LRR3 provides excellent mea- Relative speed -75 …+60 m/s Accuracy ±0.12 m/s surement accuracy of angle, velocity and distance as Vision range well as object separation. Horizontal opening angle 30 ° (-6 dB) Vertical opening angle 5 ° (-6 dB) Applications Modulation FMCW Max. number of detected objects 32 The LRR3 is the centerpiece of the automatic distance Operating temperature -40 °C…+85 °C (periphery) and speed control system ACC (Adaptive Cruise Con- Vehicle connector MQS 8 Pins trol) and Predictive Emergency Braking Systems. ACC Cycle time (incl. auto diagnosis) typically 80 ms and the Predictive Emergency Braking Systems net- Dimensions (H x W x D) 77 mm x 74 mm x 58 mm Weight 285 g work the radar sensor with the ESP® system. Power consumption typically 4 W ISO certification ISO 15622 Class IV sensor ACC uses information from the long-range radar sensor to control the vehicle’s speed by automatically braking Sensor architecture and accelerating so that it maintains at a predefined The LRR3 sensor is a monostatic Frequency Modulated minimum distance from the preceding vehicle. Continuous Wave (FMCW) radar with four fixed beams. An important aspect of the sensor architecture is the Our Predictive Emergency Braking Systems continu- high level of integration for the RF-functionality as well ously monitor the situation in front of the vehicle and as for the sensor control unit and the signal process- trigger appropriate collision avoidance/mitigation ing. This results in a highly reliable and compact sensor. measures in critical situations. They support the driver We use cost-effective, fully silicon based technology with an intelligent predictive warning concept and also for the RF-components. Innovative signal processing provide effective emergency braking assistance in algorithms allow excellent measurement performance critical situations. If a collision is unavoidable, the and the handling of complex traffic situations such system automatically triggers emergency braking in as a “lane free detection” by angular separation of order to reduce the risk of injury. ob­jects. Our dedicated safety concept guarantees the compatibility of the sensor with safety relevant Via intelligent networking of our radar sensor with applications. components and systems installed in the vehicle or by integrating information of other sensors such as a The sensor consists of two PCBs: camera or additional radar sensors we enable new  The RF-module contains the RF-circuitry (SiGe- applications or enhancements of existing functions. MMICs) and the Radar-ASIC with integrated modu­ Through the use of multiple sensors and components lation control and the signal pre-processing (pre- we further increase the safety of vehicle occupants amplification, A/D conversion, filtering). and other road users without increasing cost. Bosch  The sensor control unit contains the microcontroller, collects this networking of components and systems the System-ASIC and optionally a FlexRay transceiv- under the name CAPS – Combined Active Passive er. The integrated sequencer takes over control tasks Safety. of the radar sensor. This enables the handling of new signal processing algorithms by the microcontroller as certain time consuming task schemes are out- sourced and taken over by the Radar-ASIC. The micro- Robert Bosch GmbH controller has been developed especially for driver Chassis Systems Control Driver Assistance assistance systems. The System-ASIC forms an essential part of the safety concept. It provides the Postfach 16 61 power supply and contains the CAN interfaces. 71226 Leonberg Germany Sensor performance www.bosch.de/k The LRR3 sensor exhibits a combined patch lens anten- www.bosch-acc.com na which is well suited for large frequency ramps allow- ing a high resolution in distance. Its advanced antenna Printed in Germany 292000P03W-C/SMC2-200906-En © Robert Bosch GmbH 2009. All rights reserved, also regarding any disposal, exploitation, repro- duction, editing, distribution, as well as in the event of applications for industrial property rights.


Document Created: 2009-07-30 11:48:51
Document Modified: 2009-07-30 11:48:51
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