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240 Landmarks TopChassis > Mazda vehicle speed actuated 4WS system
 Mazda vehicle speed actuated 4WS system
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・ Rear wheel steering systems of Japanese vehicles launched in the market in the late 80's made a case to the world of Japan's advanced automotive technologies.
・ Mazda developed a system for a vehicle speed actuated 4-wheel steering (4WS) system. It had a sensitive small turning performance at low speeds, controllability at medium speeds that allowed the driver to feel as one with the vehicle, and reliable stability at high speeds.
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Storage location:MAZDA MOTOR CORPORATION (3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670)
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Year manufactured:1987
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Manufacturer:Mazda Motor Corporation
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Classification:Mass-production vehicle
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Current status:In use: on public display
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Model
Familiar name:Vehicle speed actuated 4WS
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Model / Weight
Company name:Mazda Motor Corporation
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Usage:Steering
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Location:Mazda Motor Corporation
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Installation vehicle:Mazda Capella
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Year of manufacture:1987
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Designed by:Hirotaka Kanazawa
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Structure, type, means, method, etc.:Basic information: Vehicle speed actuated 4WS; Structure, means: Control yoke, bevel gear
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Technical overview:1) It substantially improved stability at high speeds and turning performance at low speeds.
2) The steering angle ratio of the rear wheel to the front wheel was continuously controlled according to the vehicle speed. This was realized by sophisticatedly combining mechanical, hydraulic and electronic technologies, thus realizing technology to maintain ideal vehicle dynamic characteristics in all speed ranges.
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Points of interest, topicality:The world's first vehicle speed actuated 4WS system
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Reference materials:1) Mazda Technical Review No. 6 (Issued on April 1998), 2) Zukai Jidosha No Tekunoroji II (Takehiko Morozumi, 1992)
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