Transmission Control Systems: Description and Operation

P410 HYBRID TRANSMISSION / TRANSAXLE: ELECTRONIC SHIFT LEVER SYSTEM: SYSTEM DIAGRAM






P410 HYBRID TRANSMISSION / TRANSAXLE: ELECTRONIC SHIFT LEVER SYSTEM: SYSTEM DESCRIPTION

1. SYSTEM DESCRIPTION

The electronic shift lever system electrically controls the parking lock mechanism by using the actuator.

The transmission control ECU assembly locks/unlocks gearshift control based on lock/unlock request signals from the certification ECU (smart key ECU assembly).

The transmission control ECU assembly controls the shift control actuator when gearshift control is unlocked, and also controls the entire system based on information from the power management control ECU.

The transmission control ECU assembly detects DTCs when there are any malfunctions in the system, and informs the driver of selected malfunctions by illuminating the P position switch indicator light and master warning light, and indicating an error message on the multi-display.

2. SYSTEM DIAGRAM









3. FUNCTION OF EACH COMPONENT





4. OPERATION DESCRIPTION

(a) Operation to switch to the P position:





(1) When the park (P) is selected to activate parking lock, a signal is sent to the power management control ECU.

(2) The power management control ECU determines whether "P lock" is possible or not based on this signal and other vehicle information.

(3) If the power management control ECU determines that "P lock" is possible, it sends a "P lock" operation demand signal to the transmission control ECU assembly.

(4) After receiving the signal, the transmission control ECU assembly activates the shift control actuator in order to lock the parking lock mechanism.





(5) The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator.

HINT





In the cycloid reduction mechanism, the output shaft is linked to the external gear. Together, they rotate only a single tooth when the eccentric adapter, which is linked to the motor, rotates once. Driving force is increased in this way so that the parking lock mechanism can be switched even when high output is required for parking on a hill, etc.

(6) Turn on the P position switch indicator light.

(b) Operation to switch to a non-P position:





(1) When the hybrid system is started (the vehicle is ready to be driven) and the selector lever is moved to R, N, or D with the brake pedal depressed, a signal is sent to the power management control ECU.

(2) This signal is then sent from the power management control ECU to the transmission control ECU assembly as a "P lock release" operation demand signal.

(3) After receiving the signal, the transmission control ECU assembly activates the shift control actuator in order to unlock the parking lock mechanism.





(4) The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator.

(5) Turn off the P position switch indicator light.

5. SHIFT POSITION CHANGE FUNCTION

(a) The electronic shift lever system comprehensively determines vehicle conditions and changes the shift position, as shown in the following chart, by cooperating with the shift control function of the hybrid system (except when the reject function, described later, is in operation).

(b) Other than indicated in the following chart, when the power switch is turned off with the vehicle stopped, the shift position is automatically changed to the P position and all power is turned off.





6. REJECT FUNCTION

(a) In the electronic shift lever system, there may be a situation in which a shift change cannot be done for safety reasons. When attempting to move the selector lever in such a situation, the system sounds a reject buzzer inside the meter and changes the shift position as shown in the following table.





7. P POSITION SWITCH INDICATOR LIGHT CONTROL

(a) The indicator light comes on when the P position switch is pressed (the P position is engaged), goes off when the switch is released (the P position is disengaged) and blinks when the system malfunction occurs.





NOTICE:
Even if the system has returned to normal, the indicator light does not return to normal without the selector lever moved from the home position to N. (Normal refers to the indicator light coming on when the P position is engaged and it goes off when the P position is disengaged.)