Electronically controlled automatic transmissions — main objective The major purpose of using electronic control in an automatic transmission is to:

Introduction / Context:
Modern automatic transmissions employ electronic control units, sensors, and solenoid valves to regulate gear changes. The objective is to optimize shift quality, performance, and fuel economy while protecting components.

Given Data / Assumptions:

• Inputs include throttle position, engine speed, vehicle speed, load, temperature, and driver mode.
• Outputs actuate shift solenoids, pressure control solenoids, and lock-up clutches.
• Hydraulic circuits still perform mechanical work, guided by electronic commands.

Concept / Approach:
Electronic control coordinates shift timing and line pressure to minimize shift shock (jolt) and slip losses, improving torque transfer efficiency and drivability. It does not eliminate clutches or necessarily reduce component count; rather, it manages existing hardware more precisely and may add components (sensors/ECU) to enhance control.

Step-by-Step Solution:
Identify the driver-perceived benefit: smooth, well-timed shifts.Identify the efficiency benefit: appropriate pressure and lock-up control reduce slip losses.Select the option that states both reduced shift shock and improved torque transmission efficiency.

Verification / Alternative check:
OEM literature highlights adaptive shift strategies, torque management during shifts, and converter lock-up control to improve fuel economy and comfort, confirming the stated purpose.

Why Other Options Are Wrong:
Clutches are still required; the gear lever may remain (PRNDL selector); component count may increase due to electronics, not decrease.

Common Pitfalls:
Assuming electronics can compensate for low fluid levels or worn clutches; ignoring software calibration’s large impact on shift feel; overlooking the role of torque converter lock-up.

Final Answer:
reduce shift shock and achieve more efficient transmission of engine torque