Chapter 11 Homework Automated Transmissions Flashcards
While discussing speed matching downshifts,
Technician A says this is done to decrease the wear on the transmission’s synchronizers, as well as the entire drivetrain.
Technician B says DCT and SMT systems order slight little blips of the throttle after the downshift has occurred.
Who is correct?
A only
While discussing the PDK,
Technician A says this transaxle is designed to handle high engine torque and horsepower.
Technician B says the control unit relies on inputs available on the CAN bus, plus four distance sensors, two pressure sensors, and two engine-speed sensors to choose the correct gear and shift timing.
Who is correct?
Both A and B
While discussing Toyota’s hybrid system,
Technician A says in the power-split device, the sun gear is attached to MG1. The ring gear is connected to MG2 and the final drive unit in the transaxle and the planetary carrier is connected to the engine’s output shaft.
Technician B says the rotational speed of MG1 largely depends on the power generated by MG2. Therefore, MG2 basically controls the continuously variable transmission function of the transaxle.
Who is correct?
A only
While discussing dual-clutch transmissions,
Technician A says they are fully automated manual transmissions with computer-controlled clutches.
Technician B says they can change gears faster than any other geared transmission.
Who is correct?
Both A and B
While discussing SMTs,
Technician A says all shifts are made sequentially and there is no way to skip gears.
Technician B says the driver shifts gears using buttons or paddles on the steering wheel and/or a shifter in the console. Some units can be operated in a fully automatic mode.
Who is correct?
Both A and B
While discussing the clutches used in a DCT,
Technician A says wet clutches are used in most DCT applications because they are less expensive to manufacture, but they tend to wear quickly.
Technician B says dry clutches are used with all high-performance engines, but offer less fuel savings than a wet clutch.
Who is correct?
Neither A nor B
While discussing shifting DCT’s,
Technician A says that this transmission uses two wet or dry clutches to provide input to the transmission.
Technician B says that gear changes are made with only a 25% interruption to power flow.
Who is correct?
A only
While discussing the operation of Mitsubishi’s SST,
Technician A says when using the super sport mode the transmission is under total control of the ECU.
Technician B says operating modes are controlled by a rocker switch.
Who is correct?
B only
While discussing the Volkswagen DSGs,
Technician A says in D mode all shifts are controlled by the ECU.
Technician B says the ECU has adaptive learning, which allows it to learn how the vehicle is typically driven and will attempt to correct the shift points ordered by the driver.
Who is correct?
Both A and B
While discussing CVT transaxles,
Technician A says some CVTs use two variable-width pulleys connected by a push belt to select the best overall ratio for operating conditions.
Technician B says that many CVTs are equipped with a feature that simulates the activity of a manual shifting automatic transmission.
Who is correct?
Both A and B
