4L60E lock-up feel (LUF) solenoid info request
Posted: Mon Oct 20, 2008 10:05 am
All,
Marc (ca434sbc) has let me know that In '98/99 GM introduced a new fluid circuit in the TCC to modulate the lockup, controlled by the lock-up feel solenoid (aka. LU Feel of LUF solenoid). Without this valve being driven the lockup is *very slow* and puts a lot of heat into the TCC clutch. They did it for 2 reasons: 1) to eliminate the lock up lurch, 2) allow a partial unlock for a bit more pulling power. It is grounded to activate (like the other 4L60E solenoids).
This source: http://www.zoom-tech.com/downloads/supp ... 5E-70E.pdf says that the LUF solenoid is a pulsed (PWM) solenoid with 0.0 – 1.8 Amps (Duty MIN - MAX) and a resistance (presumably DC) 9 - 14 Ohms. Lock Up is normally activated in 2nd, 3rd and 4th Gears. Lockup is activated in late models by energizing both Lockup and LUF solenoids.
If anyone has additional info, that would be great, things like the specific control strategies GM uses, the PWM frequency, the solenoid's inductance in milliHenries, etc. would be very helpful.
The initial plan is to use one of the 2 available spare outputs to drive the LUF solenoid, once we have it the strategy and limits clear.
Also, Marc noted that the 3-2 solenoid is there to speed up the band engagement on a 3-2 kickdown shift - and its only active above 35 MPH and low speeds its off. This is an off/on solenoid (on later 4L60Es, PWM on earlier models), but we can uses this with existing code simply by setting the PWM% to 100%.
Lance.
Marc (ca434sbc) has let me know that In '98/99 GM introduced a new fluid circuit in the TCC to modulate the lockup, controlled by the lock-up feel solenoid (aka. LU Feel of LUF solenoid). Without this valve being driven the lockup is *very slow* and puts a lot of heat into the TCC clutch. They did it for 2 reasons: 1) to eliminate the lock up lurch, 2) allow a partial unlock for a bit more pulling power. It is grounded to activate (like the other 4L60E solenoids).
This source: http://www.zoom-tech.com/downloads/supp ... 5E-70E.pdf says that the LUF solenoid is a pulsed (PWM) solenoid with 0.0 – 1.8 Amps (Duty MIN - MAX) and a resistance (presumably DC) 9 - 14 Ohms. Lock Up is normally activated in 2nd, 3rd and 4th Gears. Lockup is activated in late models by energizing both Lockup and LUF solenoids.
If anyone has additional info, that would be great, things like the specific control strategies GM uses, the PWM frequency, the solenoid's inductance in milliHenries, etc. would be very helpful.
The initial plan is to use one of the 2 available spare outputs to drive the LUF solenoid, once we have it the strategy and limits clear.
Also, Marc noted that the 3-2 solenoid is there to speed up the band engagement on a 3-2 kickdown shift - and its only active above 35 MPH and low speeds its off. This is an off/on solenoid (on later 4L60Es, PWM on earlier models), but we can uses this with existing code simply by setting the PWM% to 100%.
Lance.