ELECTRONIC CONTROL TRANSMISION, LE THANH PHUC

• The Electronic Control Transmission is an automatic transmission which uses electronic technology to control transmission operation.. Band Brake• The brake band is located around the o

ELECTRONIC CONTROL TRANSMISSION

Le Thanh Phuc

Faculty of Automotive Engineering

University of Technical Education Ho Chi Minh City

Email: phuclt@hcmute.edu.vn

• 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

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Planetary Gear Set

Planetary Gear Set

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Multiplate Clutch

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• The multiplate clutch connects two rotating components of the planetary gear set

• 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

Multiplate Clutch

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Band Brake

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

• 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

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

Neutral Start Switch

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Throttle Position Sensor

• This sensor is mounted on the throttle body and electrically senses how far the throttle is open and then sends this data to the ECU

• By relaying the throttle position, it gives the ECU an indication of engine load to control the shifting and lock-up timing of the transmission

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Throttle Position Sensor

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Engine Coolant Temperature Sensor

• The engine coolant temperature sensor monitors engine coolant temperature and is typically located near the cylinder head water outlet

• A thermistor is mounted within the temperature sensor, and its resistance value decreases as the temperature increases

• When the engine coolant is below a predetermined temperature, the engine performance and the vehicle’s driveability would suffer if the transmission were shifted into overdrive or converter clutch were locked-up

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Engine Coolant Temperature Sensor

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Speed Sensor

• The speed sensor signal originates from a sensor measuring transmission/transaxle output speed or wheel speed

• Different types of sensors have been used depending on models and applications

• On some vehicles, the vehicle speed sensor signal is processed in the combination meter and then sent to the ECU

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Speed Sensor

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Stop Light Switch

• The stop light switch is mounted on the brake pedal bracket

• When the brake pedal is depressed, it sends a signal to the STP terminal of the ECU informing it that the brakes have been applied

• The ECU cancels torque converter lock-up when the brake pedal is depressed

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Stop Light Switch

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Solenoid Valves

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First Gear

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Second Gear

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Third Gear

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Fourth Gear

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Shifting Gear

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