One-Motor Electric Transmission Control.
Innovations by KSK.
KEIHIN SEIMITSU KOGYO CO. LTD. (KSK)KSKONE-MOTOR ELECTRIC TRANSMISSION CONTROL

ONE-MOTOR ELECTRIC TRANSMISSION CONTROL

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mproved energy efficiency is being called for in automobiles inorder to alleviate global warming. There is an increased need not
only to improve the fuel mileage of engines and to reduce vehicle
weight, but also for the widespread use of hybrid vehicles andelectric vehicles.
Responding to the need for ever lighter and more compactsolutions, KSK developed a transmission actuator for shift-by-wiresystems that enables both shifting and selection with a single motor.
It is designed for use in lightweight and compact transmissions inorder to cater to the need for electronic control over hybrid andelectric vehicles. It is also well-suited for automating Manual
Transmissions (MT) in cars with small engines and transmissions.

OUT-OF-THE-BOX THINKING …
An Automated Manual Transmission (AMT) is, put simply, a Manual
Transmission with a ‘robot’ performing the gear shifts. The ‘robot’ ofan AMT is the electric transmission control system that performs theSHIFT and SELECT operations. It is mounted outside the transmission
and transmits the signals it receives from the shift lever to the gears
inside the transmission. Conventional electric transmission control
systems perform their operations with the use of either two motors
for shifting and selecting or three solenoids. KSK reduced that to one
motor and one clutch – without compromising the speed of shiftingand selection operations compared to conventional control systems or
Automatic Transmissions (AT).

< 0.1 sec. < 0.05 sec.
SHIFT and SELECT reaction time

SELECT reaction time(achieved)(development goal)

Electric motor

Clutch

Biaxial hinge-joint

Thread rod
with ball screw nut

Select leverTransmission interface
A ball screw nut performs SHIFT, a select lever performs SELECT operations, both moved by the same motor. KSK’s One-Motor One-Clutch
Electric Transmission Control is actually an innovative simplification of current transmission control systems’ construction design.

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ONE-MOTOR ELECTRIC TRANSMISSION CONTROL

KSK

Conventional wisdom maintained the use of either two motors or three solenoids for shifting and selecting.
KSK’s innovative approach requires only one motor for operating a transmission.

… REDUCES WEIGHT AND SPACE AND COSTS
KSK’s innovative approach drastically reduces the space required andthe weight of the transmission control system. It also offers significant
savings in power consumption. While the AMT is not widespread today,
emerging markets offer much potential for the technology: AutomatedTransmissions ware too costly for the average car owner in thesemarkets. For those the AMT offers driving comfort at affordable prices.
In countries where trafﬁc jams are frequent and average engine
torque is relatively low, the AMT could be the ideal solution. The
product depicted here is a prototype. Development currently
centers on the electronic control as well as improving endurance andreliability of the device. Start of serial production is forecast for 2018.

60%

60%

Weight reduction

Space reduction

17.5 kg

6.8 kgTwo-Motor Electric Transmission Control
Previous product design

One-Motor Electric Transmission Control
Prototype developed by KSK

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Contact person in Germany:
Dr. Roman Ditzer
Phone+49.40.3861 8956

Emailditzer@interlogue.deWeb

rdinterlogue.com/de/ksk

Contact person in Japan:
Mr. Yukinao Takeya
Phone+81.45.401 4721

Emailyukinao-takeya@ksk-inc.co.jp

Webksk-inc.co.jp

KEIHIN SEIMITSU KOGYO CO. LTD. (KSK)
2-12-4 Irie Kanagawa-ku
Yokohama-shi
Kanagawa Prefecture 221-0014
JapanCopyright © KSK 2015
V-2015.1
Concept and Design:
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Hamburg, Germany
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