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ELECTRONIC CONTROL TRANSMISSION

LeThanhPhuc
Faculty of Automotive Engineering
University of Technical Education Ho Chi Minh City
Email:phuclt@hcmute.edu.vn

Introduction

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•
•

The Electronic Control Transmission is an automatic transmission which uses electronic technology to control transmission operation.
The transmission is virtually the same as a fully hydraulic controlled transmission.
It includes electronic solenoids, sensors, and an electronic control unit.

2

Introduction (Cont’d)

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The electronic sensors monitor the speed of the vehicle, speed of the input shaft, gear position selection and throttle opening,
providing this information to the ECU.

•

The ECU then controls the operation of the clutches and brakes based on this data and controls the timing of shift points and torque
converter lock-up and maintains on-board diagnosis.

3

Planetary GearSet –bộbánhrănghànhtinh

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The planetary gear unit is used to increase or decrease engine torque, increase or decrease vehicle speed, reverse direction of
rotation or provide direct drive.

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It is basically a lever that allow the engine to move heavy loads with less effort.

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Planetary Gear Set

5

MultiplateClutchlyhợpnhiềuđĩa

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Themultiplateclutch connects two rotating components of the planetary gear set.

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Because this assembly rotates while the vehicle is in motion, it presents a unique challenge to ensure fluid under pressure reaches
the clutch and holds the clutch engaged for thousand of miles of services.

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MultiplateClutch

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BandBrakeđaiphanh

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The brake band is located around the outer circumference of the direct clutch drum.

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One end of this brake band is located to the transmission case with a pin, while the other end contacts the brake piston which is
operated by hydraulic pressure.

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Band Brake

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One-way Clutch

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One-way clutch is a holding device which requires no seals or hydraulic pressure to apply.

•

Their operation is similar in that they both rely on wedging metal between two races.

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One-way Clutch

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First Gear

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Second Gear

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Third Gear

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Reverse Range

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Neutral Start Switch

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The ECU receives information on the selected gear range from the shift position sensor, located in the neutral start switch, and
determines the appropriate shift pattern.

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The neutral start switch is actuated by the manual valve shaft in response to gear selector movement.

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Neutral Start Switch

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Throttle Position Sensor

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LeThanhPhuc
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