FEEDBACK CONTROL DESCRIPTION [JA5A-EL]

Outline

Features

• During shift up with the accelerator pedal depressed, feedback control regulates the clutch pressure on the engagement and release sides, according to the throttle opening angle and vehicle speed. It also uses past gearshifts to optimize clutch pressure.

Note

• If the battery terminal is disconnected, feedback memory in the TCM will be erased, and thus gearshift shock may increase. The shock, however, will decrease gradually as the vehicle is driven.

Construction (system diagram)

Operation

Upshift clutch engagement pressure feedback

• Clutch pressure (2) is learned so that gear shift time (1) becomes a predetermined target value, and thus changes in performance and changes in the transaxle over time are minimized based on past gear shift results.

Upshift timing feedback (release-side clutch pressure)

• Clutch pressure release timing on the release side (2) is learned so that the change in engine speed (1) is optimized, and thus clutch pressures on the engagement and release sides are optimized.