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A FCW, CIB and DBS benefit estimation method developed in ACAT program Hirofumi Aoki, Masami Aga, Yoshiki Miichi, Yoshiaki Matsuo, and Shin Tanaka Toyota.

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Presentation on theme: "A FCW, CIB and DBS benefit estimation method developed in ACAT program Hirofumi Aoki, Masami Aga, Yoshiki Miichi, Yoshiaki Matsuo, and Shin Tanaka Toyota."— Presentation transcript:

1 A FCW, CIB and DBS benefit estimation method developed in ACAT program Hirofumi Aoki, Masami Aga, Yoshiki Miichi, Yoshiaki Matsuo, and Shin Tanaka Toyota Motor Corporation

2 Developing Systems to Reduce/Mitigate Rear-end Collisions Toyota Honda Subaru Mercedes Volvo

3 Control Sequence FCW, DBS and CIB specification System benefit The objective in ACAT Ordinary Driving Collision DBS (Brake Assist) FCW CIB (Automated braking) Time Speed

4 Drivers reaction to Benefit Ordinary Driving Collision Time Speed FCW + DBS CIB DBS (Brake Assist) FCW CIB (Automated braking)

5 Drivers reaction to Benefit So… Each benefit significantly depends on “how drivers react before collisions”. Ordinary Driving Time Speed Collision FCW + DBS CIB DBS (Brake Assist) FCW CIB (Automated braking)

6 Driver behavior investigation using the Driving Simulator

7 Driving Simulator Test Example

8 Driver Reaction Before Collisions Maximum deceleration s s 60s - Period from warning to braking onset [m/s 2 ] [s] (31 persons in total)

9 Rear-end Reconstruction Concept How are rear-end collisions happening? Traffic accidents are happening incidentally

10 Rear-end Collision Modeling Rear-end collisions are happening by a combination of Braking patterns * Various braking patterns Coasting Various brake trigger timings Brake trigger timing * Various response delays Braking How was the hypothesis verified

11 EDR Data Analysis Speed reduction (mph) 3m/s 2 4m/s 2 5m/s Number of cases None-1s (Total 70 cases) s-3s-4s-5s Braking onset before a crash None-1s-2s-3s-4s-5s Braking onset before a crash Source : NHTSA EDR database CDR system connected to a crashed vehicle ftp://ftp.nhtsa.dot.gov/NASS/EDR_Reports/

12 Comparison between EDR [%] Frequency 50 Speed reduction [mph] None-1s-2s-3s-4s-5sNone-1s-2s-3s-4s-5s and simulation result 0 Simulation result Braking onset before a crash EDR Simulation result shows similarity to EDR

13 Rear-end Collision Simulation Without a System B D A C E CoastingBraking patterns System benefit can be estimated by comparing P v.s. A, Q v.s. B, R v.s. C and so on. With a System Warning Q S P R T DBSCIB Danger is noticed later than warning onset Braking onset will be sooner Danger is noticed prior to warning onset +FCW,DBS & CIB

14 FCW onset DBS onset CIB onset = 1.7 sec = 0.8 sec = 0.45 sec SV = 20m/s *e.g., sleepy or fell asleep Expected to push brake pedal (%) Speed reduction Crash avoidance ratio (mph) FCW +DBS FCW +DBS +CIB CIB Not expected to push brake pedal* 3.2mph 6.3mph 8.1mph 4.5mph % 1.0% 0.0% *Under the Japanese MLIT guideline in 2003 Simulation 1 FCW +DBS FCW +DBS +CIB CIB

15 5.7 mph 12.3 mph 15.4 mph 9.1 mph 0.0% 7.9 % 13.5 % 0.0 % Simulation 2 FCW onset DBS onset CIB onset = 2.0 sec = 1.1 sec = 0.75 sec SV = 20m/s (%) Speed reduction Crash avoidance ratio (mph) FCW +DBS FCW +DBS +CIB CIB FCW +DBS FCW +DBS +CIB CIB Expected to push brake pedal Not expected to push brake pedal

16 Conclusions An estimation of the benefit of FCW, CIB and DBS was developed. 1.Driver response before collisions was measured in the driving simulator. It was shown that response varied widely from person to person. 2.Rear-end collisions were reconstructed. The result was validated with the EDR data analysis. 3.Estimation method demonstrated the benefit difference by each specification.

17 Current Study; LDW benefit estimation

18 End


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