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240 Landmarks TopTransmission and Drive Train > Finger control transmission (FCT)
 Finger control transmission (FCT)
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Finger control transmission (FCT)
In shift operations using mechanical link mechanisms in rear-engined buses, the FCT detected the position of the shift lever and converted it into an electronic signal. These signals were then used to perform transmission changes using air pressure. This resulted in easy shift changes and reduced driver fatigue, and also reduced the weight of the link mechanism. A pseudo-reaction force was added to the operation to reduce driver discomfort. Moreover, elaborate fail-safe mechanisms were incorporated, such as one that prevented mis-shifts, and one that assured safe driving in the event of system failure. The FCT was used in MP series heavy duty route buses from November 1983 after basic research and multiple prototypes and practical tests over 10 years. It gained popularity in combination with measures to assist older drivers, and in the following year, it was applied to large heavy duty tour buses.
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Storage location:MITSUBISHI MOTORS CORPORATION, MITSUBISHI FUSO TRUCK AND BUS COMPANY, TRUCK AND BUS TECHNICAL CENTER, ADMINISTRATION DIV. (10 Ookura-cho, Nakahara-ku, Kawasaki-shi, Kanagawa-ken 211-0023)
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Year manufactured:1983
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Manufacturer:Mitsubishi Motors Corporation
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Classification:Literature
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Current status:In storage: open to the public
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Name / Manufacture
Company name:Mitsubishi Motors Corporation
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Applied model:Heavy and medium duty rear engine buses
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Year of manufacture:1983
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Specification
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Potency
Structure, type, measure, means, etc.:The conventional mechanical control mechanism was replaced by an electronic-air type control mechanism. To operate the transmission, the force applied to the shift lever by the driver's hand activated a switch, and the position of the lever was changed to an electronic signal to be transmitted to the control box. The control box transmitted the shift signal from the lever to the magnet valve of the gear shift unit, causing the compression air gear to operate.
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Function, effect, etc.:Backup function
Mis-shift prevention function: Shift operations were prevented above specified vehicle speeds for each shift to prevent mis-shifts.
Electronic failure handling function: If an electric system failure occurred, the gears could be manually shifted to allow the vehicle to be driven safely.
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Effect:Improved operability: Approx. 1/3 operation force, and approx. 1/2 operation stroke compared with mechanical large transmissions. Approx. 20% reduction in shift time on normal roads.
Weight reduction: 30 kg reduction as control rods were not required.
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Features:・Dramatically reduced shift operation force without changing the operation method of the clutch or transmission.
・The FCT had a shift feeling similar to a conventional transmission by the provision of a pseudo-reaction force to simulate gear engagement by discharging compressed air when the shift operation was completed.
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Reference materials:Nobuo Miyazawa, Yukio Hasegawa, Toshiaki Tateno, "Finger Control Device for Transmission", Journal of Society of Automotive Engineers of Japan Vol. 38, No. 2, 1984, pp. 236-241
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