TCM [ET6A-EL (US)]
TCM [ET6A-EL (US)]
SM2565411
id0517n13620x5
Purpose/Function
• The TCM detects the vehicle conditions and performs calculations and processing based on input information from each type of sensor and switch.
• Outputs control signals to each solenoid valve so that each type of control is optimally implemented according to the vehicle conditions.
Function Table
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Control item |
Main control content |
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|---|---|---|---|---|
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Shift point control
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Automatic shift control
(D position)
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Driving mode
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Normal mode
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• Normal mode selected using drive selection
• Performs automatic shift corresponding to vehicle speed and accelerator pedal depression amount
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SPORT mode
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• SPORT mode selected using drive selection
• Performs automatic shifting corresponding to vehicle speed and accelerator pedal depression amount
• Lower gear is selected than while in the Normal mode
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Active Adaptive Shift (AAS) mode
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• Unnecessary shift up is suppressed for several seconds by maintaining the gear corresponding to the operation speed at which the accelerator pedal is released
• The optimum gear on the low vehicle-speed side is selected and shift down is executed corresponding to the operation force at which the brake pedal is depressed
• During cornering, shift up is suppressed in preparation for acceleration after cornering
• In regions of high elevation, the optimum gear is selected corresponding to the environment
• The slope is estimated in the TCM to select the appropriate gear for ascent and descent
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High ATF temperature mode
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• Controls engine torque when the ATF temperature is high
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Low engine coolant temperature mode
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• If the engine coolant temperature is low, a gear lower than when in normal mode is selected
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Direct mode (with steering shift switch)
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• When the steering shift switch is operated while driving with the selector lever in the D position, the gear position may temporarily switch
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Manual shift control
(M position)
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• When M position is selected, manual shifting is prioritized according to the driver’s shift up/shift down operation
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Shift pressure control
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Line pressure control
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• Controls line pressure with high accuracy and fine control corresponding to engine load conditions and vehicle driving conditions
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Direct electric shift control
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• Performs direct, electronic control of clutch engagement pressure appropriate to engine load conditions and vehicle driving conditions
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Learning control
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• Learns engine performance changes and transaxle deterioration over time to optimally correct clutch engagement pressure
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Torque converter clutch (TCC) control
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• Based on adoption of full range TCC control, active TCC control directly after acceleration from stop
• By gradually engaging/disengaging TCC piston, shock during operation is reduced
• Implements TCC control when accelerator pedal is fully closed for improved fuel economy and emission performance
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Engine-transaxle integration control
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• Optimally controls engine output torque when shifting
• Calculates optimum clutch engagement pressure according to engine output torque
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On-board diagnostic system
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• Main part of transaxle control includes self-diagnosis function. In case of malfunction, automatic transmission warning light illuminates to alert driver, and DTC is stored in TCM
• When transaxle malfunction is determined resulting from on-board diagnostic test, system control is switched to prevent any dangerous situation while driving
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Construction
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Block diagram
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Operation
Correlation between control and input/output parts
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