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240 Landmarks TopEquipment and Part > Laser radar collision warning system
 Laser radar collision warning system
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1. This was the world's first collision warning system using laser radars.
2. It calculated the distance and relative speed between two vehicles quickly based on vehicle speed and the time taken by laser light to return to the reception device installed at the front of the vehicle after striking the rear reflectors of the vehicle ahead.
3. If the distance between the cars was below a certain limit in relation to the vehicle speed, an alarm was given. If the distance then fell below a separately set limit, a danger signal was given. The limit value could be selected to one of three distances (far, middle and near) according to the driver's preference.
4. The system was designed only to react to the first guardrail reflector on the road shoulder and not those beyond it.
5. In addition, the system also contained functions that issued alarms useful to the driver. It was set not to issue needless alarms if vehicle speed and following distance were constant or the vehicle was driving at low speeds in crowded city streets
6. Originally, the laser radar system was relatively large as shown in the picture (right). Four years later, its size was reduced and its performance and practicality were greatly improved. Additionally, the indication portion was continuously improved by building it into the instrument panel as a 2DIN size audio device, etc. The system played a pioneering role in the development of current collision warning systems.
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Storage location:NISSAN DIESEL MOTOR CO., LTD. (1-1 Ageo-shi, Saitama 362-8523)
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Year manufactured:1989
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Manufacturer:Nissan Diesel Motor Co., Ltd.
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Classification:Mass-produced product
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Current status:Not open to the public
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Model name:Traffic Eye (1st generation)
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Familiar name:Traffic Eye (1st generation)
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Technical applications:Collision warning for trucks and buses
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Applied model:General trucks and buses (24V vehicles)
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Year manufactured:1989~1993
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Application year:1989
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Designed by:Toru Yasuma
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Collaboration:Nissan Motor Co., Ltd., Kanto Seiki Co., Ltd. (now Calsonic Kansei Corporation)
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Device structure:Laser reception and transmission portion installed on vehicle front, indication portion on driver's side. Vehicle speed detecting portion: TM portion
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Display portion:Installation method on driver's side: Installed on instrument panel; Indication detail: Distance to obstacle; Indication method: Light-emitting diode (LED); Dimensions: 150 x 60 x 120 (width x height x depth); Warning method: Electronic buzzer; Mass: 0.5 kg; Selection of detection distance: Three types (far, middle, near); Warning types: Warning and danger signal
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Performance function:Front obstacle detecting distance: Min. 90 m (when laser light reflects from rear of the vehicle ahead); Warning method: Computation based on (1) relative vehicle speed to vehicle ahead, (2) vehicle speed proportional distance, (3) detection of stopped vehicles; Warnings not issued when: (1) driving at low speeds, (2) driving on curved roads, (3) vehicle speed and following distance are constant
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Effect:The system prevented rear-end accidents caused by drowsy or inattentive driving, and thereby improved traffic safety. It was reported that vehicles installed with this system triggered warning alarms roughly once or twice every 6 months, meaning that it was effective in reducing accidents.
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Points of interest, topicality:The world's first collision warning system applying laser radar.
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Features:The system detected laser light after striking the rear reflectors of the vehicle ahead to measure the constantly changing distance to the vehicle and the relative speed, and performed calculation according to the vehicle speed. The system then issued two types of warning (alarm and signal).
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Reference materials:Kiyoshi Minami, Toru Yasuma, Shigeru Okabayashi, Masao Sakata, Itsuro Muramoto, Tadao Kozu, "Torakku You Reza Reda Tsuitotsu Keihou Sochi", Nissan Diesel Technical Review No. 50, pp. 17-22, Jul. 1988
Toru Yasuma, Masato Kobayashi, Tomonari Ishikawa, Tadao Kozu, Itsuro Muramoto, "Laser Rear-end Collision Warning System for Heavy-duty Trucks", Journal of Society of Automotive Engineers of Japan Vol. 43(2), pp. 65-73, Feb. 1989
Toru Yasuma, Kiyoshi Minami, Shigeru Okabayashi, Tadao Kozu, JSAE Transaction (41). pp. 57-62, May, 1989
Toru Yasuma, "Traffic Eye Ni Tsuite", Nissan Diesel Technical Review No. 52, pp. 131-133, Apr. 1990
Toru Yasuma, Yukio Ogawa, Sadayuki Arai, "Traffic Eye Reda No Ame, Kiri No Toukasei To Shikai", Nissan Diesel Technical Revies, No. 53, pp. 26, Apr. 1991
Toru Yasuma, Atsushi Gonmori, Satoru Matsumori, Jun Nishino, "Performance and Function of the Collision Avoidance Warning System with a Small Sized Laser Radar", Proceedings for JSAE Technical Paper Presentations 939, pp. 129-132, Oct. 1993
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