Consultation on automatic transmissions

Hello everyone, I read a book there and I kept the following questions, which I hope you use them can answer them, since I do not handle this topic very well.

1- In the cruise speed, what function does the converter stator comply with?

2- If the gear lever is in D with the brake on, what does the computer do?

3- In relation to BBS, when the brakes are not operated, the voltage that reaches the PCM is 0 volts?

4- The more I accelerate the engine, the smaller the pressure of the automatic box?

5- If the engine temperature is less than 70 ° C, does the PCM increase or decrease the speed of gear passage?

6- Are there distributing valves in automatic transmissions such as a 3-way and 2 positions?

7- Some other names that the manual valve is recognized.

I hope you can help me answer these questions. Greetings to the entire community.

That such a friend, I hope my answers can help you a little and not confuse you more hehe

as you will have noticed in the book that you read one of the many difference between a STD transmission and an automatic is that: in the STD transmission there is a mechanical coupling between the engine and the transmission crosses from the clutch, in an automatic transmission the coupling is hydraulic. This hydraulic coupling is performed within Torsion converter.

The Torsion converter performs 2 phases: torsional pair multiplier and hydraulic coupling. But there are converters who perform a third phase that is mechanical coupling.


I hope you are not confusing you anymore.

1.- In cruise speed, the torque converter (or torsion converter) is in a hydraulic coupling phase, the stator serves to direct the oil from the turbine.

2.- At the moment you put the lever in the position D (logically you do it with the brake on the brake) you will have noticed that you feel as at that time a clutch was coupled.
At the moment you selected D the computer received a signal from a sensor called TR, at that time it energized a solenoid or more (depending on the transmission) to conduct the flow of oil to the 1st speed clutch, so you have or not step on the brake pedal those signals by the computer are already performed.

3.- Indeed the voltage that reaches the computer of said sensor is 0 volts

4.- The transmissions work with a pressure range, that pressure varies depending on the transmission, by accelerating you increase the pressure a bit. For example, if in a manual you see that in D there must be a pressure from 54 to 96Psi, if that pressure is increased there is a relief valve to avoid that there is a lot of pressure. (Like the engine oil pump or as the pressure regulating valve in the injector rail). Note, that pressure that gave you there is an example that in that range it will work in D without increasing 96 or decreasing from 54psi for the correct functioning of the transmission.

5.- That depends on the type of handling, for that the computer needs to know the values ​​of engine sensors such as TPS, ECT, MAF, MAP, CKP and VSS


6.- In fact there are for example the manual valve, but each transmission is different you can find with simple transmissions of a single body of valves and more complex with several valve bodies.

7.- At least I only know it with that name

greetings and remember that thank you not for anything.