Thanks to electronic transmission controls, modern automatic transmissions are much moreįuel efficient than their purely mechanical/hydraulic predecessors. Inputs from the traction control system instruct the transmission to downshift when one or more tires are losing traction. The TCM may also downshift the transmission if the vehicle is going downhill in order to utilize the compression braking of the engine.
TRANSMISSION CONTROL MODULE DRIVER
The brake pedal position sensor helps to ensure that the driver has applied the brake before shifting into park or reverse. If the automatic transmission fluid is hot, then the transmission is downshifted. The transmission fluid temperature sensor is used to ensure that the automatic transmission fluid is at the correct temperature. The torque converter lock-up clutch increases the efficiency of the transmission by eliminating the hydraulic and pumping losses associated with the torque converter when traveling at steady high speeds. Which helps it decide when to activate the torque converter lock-up clutch. The TCM uses this information to find the slippage across the torque converter,
The turbine speed sensor determines the speed of the torque converter. This input is used to determine the best time to change a gear. The throttle position sensor tells the TCM how far the throttle is open which indirectly indicates the engine load. This information helps the TCM determine when to change gears. The crankshaft position sensor provides information to the TCM to determine the existing rotational speed of the engine. The gear position selector switch communicates to the TCM which gear has been selected by the operator. In the transmission that control the position of various valves and gears. Based on this information, the control module adjusts the current supplied to solenoids
TRANSMISSION CONTROL MODULE SOFTWARE
The software in the TCM isĭesigned to optimize vehicle performance, shift quality and fuel efficiency.Įlectronic sensors monitor the gear position selection, vehicle speed, throttle positionĪnd a number of other parameters. The signals that drive actuators to accomplish this shifting. It processes this input to calculate how and when to shift gears in the transmission and generates Input from various sensors as well as data provided byĮngine control module (ECM). The Transmission Control Module (TCM) controls modern automotive transmissions based on
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