Test Driving "Collision-Free" Cars

--Subaru and Volvo take top honors

Product Details

Language
English
Format
PDF
File Size
2.1MB
Print Length
37 Pages
Publisher
Nikkei Business Publications,Inc.
Published
June 2014
Delivery
Immedate Download

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Report Description

Nikkei Automotive Technology magazine evaluated low- and mid-speed recognition (vehicle and pedestrian) and braking functions in automobiles from nine manufacturers equipped with autonomous braking systems. This was the first comparative evaluation in Japan of autonomous braking for pedestrians. Overall, models from Fuji Heavy Industries Ltd. of Japan (Subaru) and AB Volvo of Sweden came out on top, with AAA ratings. We analyzed the data to see just what different manufacturers do differently, and probed their design philosophies

Part 1: Critical choices affect results

Collision avoidance performance at low and medium speeds (mainly 20 km/h to 50 km/h) was evaluated, for both stationary vehicles and pedestrians. As the test included pedestrians, different vehicles showed widely different recognition capability especially for human figures. Infrared laser and millimeter-wave radar systems, however, were not capable of sensing pedestrians, resulting in lower scores.

Part 2: Braking performance analysis

In addition to measuring the top speed at which a collision would be avoided, we also measured the maximum deceleration applied during braking. An analysis of the results revealed the safety philosophy of each firm through brake operation dynamics. In general, they fall into two groups: stopping rapidly, or alerting the driver first and then stopping. The former approach was selected by Suzuki, Toyota, Honda, Volvo, and VW, and the latter by Daihatsu, Nissan, Subaru, and BMW.

Part 3: Sensor evolution

While millimeter-wave radar fell short of cameras in the tested systems, it is catching up fast. The first millimeter-wave radars capable of recognizing pedestrians are expected to reach the practical level in the second half of 2015, and costs will drop rapidly thanks to complementary metal-oxide semiconductor (CMOS) technology. Infrared lasers are likely to become less important, shifting to different applications.

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Table of contents

Part 1: Critical choices affect results

Best-scoring models mount cameras

Part 2: Braking performance analysis

Two approaches to safety

Part 3: Sensor evolution

Millimeter-wave sensors catching up to cameras

Figures and tables:

Part 1
Table 1 Major specifications and results for tested autonomous braking systems
Fig. 1 XV testing
Fig. 2 V40 also sensed pedestrian and stopped automatically
Fig. 3 EyeSight stereocamera
Fig. 4 X TRAIL testing
Fig. 5 Image recognition chip used in V40, M5, and X TRAIL
Fig. 6 Crown Athlete testing
Fig. 7 The Bosch millimeter-wave radar used in the Golf Variant
Fig. A Vehicle target
Fig. B Pedestrian target
Fig. C Instrumentation for position, speed, and acceleration
Part 2
Fig. 1 Suzuki Wagon R testing
Fig. 2 Suzuki Wagon R measurement results
Fig. 3 Honda Fit Hybrid measurement results
Fig. 4 Volvo V40 measurement results
Fig. 5 Toyota Crown Athlete measurement results
Fig. 6 VW Golf Variant measurement results
Fig. 7 VW Golf Variant testing
Fig. 8 Subaru XV measurement results
Fig. 9 Nissan X TRAIL measurement results
Fig. 10 BMW M5 testing
Fig. 11 Daihatsu Tanto measurement results
Fig. 12 BMW M5 measurement results
Part 3
Fig. 1 Pedestrian recognition with millimeter-wave radar
Fig. 2 Discriminating between human and vehicle reflections
Fig. 3 Signal processing technology improves millimeter-wave radar recognition precision
Fig. 4 79 GHz waveband millimeter-wave radar
Fig. 5 CMOS implementation of millimeter-wave radar transceiver
Fig. 6 Continuing evolution in stereocameras
Fig. 7 Far infrared sensors attracting attention

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