E4OD Operation
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
The E4OD has an on/off solenoid to control the torque converter clutch. A switch is all that is required, there is no control. Either the solenoid is powered or not powered. The EPC is the only solenoid in an E4OD that requires a controller.
Just as an FYI, the torque converter clutch solenoid in a 4R100 is a pulse width modulated (PWM) solenoid that requires a duty cycle controller.
Just as an FYI, the torque converter clutch solenoid in a 4R100 is a pulse width modulated (PWM) solenoid that requires a duty cycle controller.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
The E4OD has an on/off solenoid to control the torque converter clutch. A switch is all that is required, there is no control. Either the solenoid is powered or not powered. The EPC is the only solenoid in an E4OD that requires a controller.
Just as an FYI, the torque converter clutch solenoid in a 4R100 is a pulse width modulated (PWM) solenoid that requires a duty cycle controller.
Just as an FYI, the torque converter clutch solenoid in a 4R100 is a pulse width modulated (PWM) solenoid that requires a duty cycle controller.
I am confused. Baumann gives 9 different TCC Firmness levels (0 to 255)based on the TPS value. I can only control On/Off with a switch.
Maybe that applies to the 4R100 only. I am using a Ford Lightning model. I'll look at another model.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
You would be able to do that with a 4R100, not an E4OD.
If you switch to a PWM solenoid you also need to open an orifice in the trans. I think it is in the pump body, but I'm not sure. The E4OD has a small orifice, in the 0.030" range. When the solenoid switches from off to on, this orifice controls the apply time of the lockup clutch. A PWM system has this orifice wide open (at least 0.250") so that the PWM controls the apply time.
If you switch to a PWM solenoid you also need to open an orifice in the trans. I think it is in the pump body, but I'm not sure. The E4OD has a small orifice, in the 0.030" range. When the solenoid switches from off to on, this orifice controls the apply time of the lockup clutch. A PWM system has this orifice wide open (at least 0.250") so that the PWM controls the apply time.
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Postmaster
Joined: Aug 2001
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From: Delaware
I'm going to continue on the path that I'm on for TCC. I can switch to PWM, if necessary.
I found the Temperature Sensor Transfer Function. I should be able to find the Fluid Temperature Pressure Adder.
I found the Temperature Sensor Transfer Function. I should be able to find the Fluid Temperature Pressure Adder.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
EPC must be controlled in all gears. EPC controls line pressure, which is used to maintain capacity in every clutch. If the line pressure is too low clutches will slip and that's the end of the trans. It can be zero in park and neutral.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
The CCS is energized when the OD OFF light is on. It applies the coast clutch which is used to provide engine braking in 1, 2, and 3 when the OD is turned off.
It can NEVER be energized when the trans is in fourth gear or you have what's called a tie up. A tie up is when all parts of the rotating assembly are held from rotating. The output shaft stops RIGHT NOW and the rear wheels also stop. Either that or hard parts break.
It can NEVER be energized when the trans is in fourth gear or you have what's called a tie up. A tie up is when all parts of the rotating assembly are held from rotating. The output shaft stops RIGHT NOW and the rear wheels also stop. Either that or hard parts break.
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Postmaster
Joined: Aug 2001
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From: Delaware
Mark,
I don't have the OD Cancel switch implemented on either vehicle. I can't turn OD off. I assume that I will never have to energize the Coast Clutch Solenoid as long as I don't cancel OD. I could implement it in the future, but I don't use either truck for heavy towing, so I have no need for it.
I don't have the OD Cancel switch implemented on either vehicle. I can't turn OD off. I assume that I will never have to energize the Coast Clutch Solenoid as long as I don't cancel OD. I could implement it in the future, but I don't use either truck for heavy towing, so I have no need for it.
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Postmaster
Joined: Aug 2001
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From: Delaware
I have had a small delay. I have the software done, but I planned to Wire Wrap the jumpers on the circuit board. I bought an electric Wire Wrap gun, but it came without the specific bit that I need. I have that on order, and should get it this week. If all goes well I could be testing it this weekend.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
The tools that I needed finally showed up on Saturday.
I used to be proficient at wire wrapping, but much time has passed, and my eyes are not what they used to be. I got 2 jumpers wrapped in the first hour, and 4 more in the second hour. In spite of my difficulties, I was able to get all of the jumpers installed.
Now I need to add a connector, and mount all of the parts in a box, including a MOSFET for the EPC driver, and a DC-to-DC Power Converter to power the unit from a 12 Volt source.
I used to be proficient at wire wrapping, but much time has passed, and my eyes are not what they used to be. I got 2 jumpers wrapped in the first hour, and 4 more in the second hour. In spite of my difficulties, I was able to get all of the jumpers installed.
Now I need to add a connector, and mount all of the parts in a box, including a MOSFET for the EPC driver, and a DC-to-DC Power Converter to power the unit from a 12 Volt source.