what is electronically controlled transmission?

Question

i have a lexus and on the specs. and info it says electronically controlled transmission...and its an automatic

Answer 1

Older Transmissions were constructed to shift with Oil pressure. They did not shift smoothly and sometimes due to wear they would not shift at all.

The newer transmissions are conrolled by the "On Board" computer. They are set to shift according to the speed of the drive shaft. Some cars have two speed switches that work off of the rear of the Transmission. Some cars only have one. There is more than one item that controls the speed at which the auto will shift.

Electrically controlled shifting is smoother and less trouble some than the older method.

Answer 2

Well you got alot of it but here are a couple additions. Older transmissions used a combination of vacuum and hydraulic pressures. This would in turn use the oil in the tranny to push on certain pistons at certain times. This would make for rough shifting and sometimes no shifting. The electronically controlled transmission uses a computer to do the shifting through the use of solenoids. The computer does this with the inputs from various sensors such as: Speed sensor, Throttle position sensor, Manifold pressure sensor, and others that I cannot think of at this point. Very complicated indeed.

Answer 3

On earlier automatic transmission, the automatic feature is controlled by a group of valves working together to control the shifting sequences.
electronically controlled transmission as the name implies,,it is controlled electronically by a computer. instead of using the old valves from old transmission they use electronic softwares to control shifting sequences. some of the added parts are speed sensors, solenoid valves and control unit which is the memory.

some advantages of electronic transmission are the following,
lesser in volume,lighter in weight
easy to maintain and repair,, most parts are accessible externally
smooth in shift and quicker in reaction

Answer 4

Older transmissions used to be used to be controlled by vacuum coming from the engine. It told the transmission when to shift by the amount of vacuum which changed by the revolutions of the engine. More revolutions meant more vacuum. These days, the computer reads to revolutions and acceleration of the engine. It, in turn, tells the transmission when to shift based on demand and RPMs of the engine.

Answer 5

the computer monitors transmission conditions, acceleration pedal inputs etc and changes the transmission shift points to give you optimal performance and economy

Answer 6

electro transmission