What is transmission shift schedule?

Abstract Traditionally the transmission gear-shifting schedule is based upon the throttle position and the vehicle (or engine) speed. This paper proposes to add a third parameter, called the terrain coefficient, to form a three-parameter gear-shifting schedule for improving the fuel economy of a vehicle.

When should I shift gears automatic?

An automatic transmission knows to shift when you’re trying to pass another vehicle, going uphill or downhill, or trying to accelerate.

How often do automatic transmissions fail?

Without service and maintenance, some transmissions can fail in as little as 100,000 miles. If you drive around 10-15,000 miles a year, your transmission could be down for the count in seven years! With care and service, transmissions can last 300,000 miles or more.

How does the gears in an automatic gearbox work?

The same effect can also be achieved by locking the planet gears to the planet carrier. Most automatic gearboxes have three forward speeds, and use two sets of epicyclic gears. The locking sequences of the epicyclic gear train are achieved by hydraulic pressure operating brake bands or multi-plate clutches.

How does a planetary gear system work in an automatic transmission?

An automatic transmission usually has more than one planetary gear set. They work together to create multiple gear ratios. Because the gears are in constant mesh in a planetary gear system, gear changes are made without engaging or disengaging gears, like you do on a manual transmission.

How many gears does a manual transmission have?

In general, an automotive gearbox is mainly classified into four categories: Manual – With up to 6 forward gears in a car and up to 13 forward gears in a truck Fully Automatic Transmission – up to 9 speed Continuously Variable Transmission – CVT

How does a gear ratio change on an automatic transmission?

The higher a gear ratio is, the less torque is delivered. On a manual transmission, you have to move your gear shift to change the gear ratios. On an automatic transmission, gear ratios increase and decrease automatically. And this is able to happen thanks to the ingenious design of a planetary gear.