СИСТЕМА МЕХАНИЧЕСКОЙ ТРАНСМИССИИ "MULTIMODE" ОПИСАНИЕ СИСТЕМЫ

  1. MULTI-MODE MANUAL TRANSAXLE SYSTEM OUTLINE

    1. The multi-mode manual transaxle has been developed from the conventional manual transaxle by adding actuators that are directly controlled by electric motors. The transaxle control system consists of an electronic throttle control system, clutch actuator, shift and select actuator, sensors, shift lever, and TCM. The system offers automatic clutch operation and two driving modes: automatic shifting E mode and manual shifting M mode.

    2. The stroke sensors, which are mounted on each actuator and detect the actuator operating position, are double non-contact type.

    3. The multi-mode manual transaxle is equipped with a clutch actuator, which has a motor for clutch engagement, and a shift and select actuator, which has two motors for shifting and selecting gear shafts that have been used on the conventional manual transaxle. Each actuator operates in accordance with signals from the TCM. The TCM receives information from the ECM and sensors, and controls the engine and multi-mode manual transaxle.

    4. The shift lever features a shift-by-wire system that electrically detects the shift lever position chosen by the driver and sends a shift lever position signal to the TCM to control the transaxle.

    5. The shift lever has an electrical shift lock mechanism. When the ignition switch is turned off or the shift lever is in N with the engine running and the brake pedal released, the shift lever is locked in the current shift position.

    6. The multi-mode manual transaxle system has fail-safe functions. When the TCM detects a malfunction in the system, the ECU illuminates the Multi-mode Manual Transaxle warning light (MMT warning light) to inform the driver that a malfunction has occurred. If necessary, the ECU illuminates the Malfunction Indicator Lamp (MIL) and Multi-mode Manual Transaxle warning light simultaneously. Under such conditions, the fail-safe function allows the vehicle to be operated in order to avoid emergency situations.

    7. If the clutch temperature exceeds the specified level, the multi-mode manual transaxle system will sound a buzzer (intermittently sound) and blink the Multi-mode Manual Transaxle warning light (the blinks do not indicate a malfunction) to warn the driver.

  2. FUNCTIONS OF MAIN COMPONENTS

    Tip:

    *: Shift and select directions are as shown in the illustration.

    A012NB8C01
    *a Shift and Select Actuator Operation
    *b Shift Direction
    *c Select Direction
    Component Outline
    Combination meter (meter ECU) Controls the operation of the indicator lights, warning light and buzzer.

    Multi-mode manual transaxle warning light

    (built into combination meter)

    		 Illuminates to alert the driver when a malfunction occurs in the multi-mode manual transaxle system.

    Gear position indicator

    (built into combination meter)

    		 Indicates the current gear position. The indicator flashes if the actual gear position and the shift lever position do not match.

    Mode indicator

    (built into combination meter)

    • Indicates E (Es) mode or M mode.

    • Illuminates when easy sports (Es) mode is selected during easy (E) mode driving in E mode. Does not illuminate while easy (E) mode is selected.

    Buzzer

    (built into combination meter)

    Sounds if the following conditions are met simultaneously:

    • Engine is running

    • Shift lever is in E, M or R

    • Driver door is open

    • Vehicle is stopped

    Sounds during system warning.

    While performing initialization and learning or clamp position adjustment without using the GTS, the buzzer sounds to indicate the ECU mode change.

    Shift lever position sensor

    (built into shift lever assembly)

    		 Sends the shift lever position and shift request ("+" or "-") through the ON/OFF combination of the 6-contact switch and the 2-contact switch.

    Transmission shift main switch

    (built into shift lock control unit assembly)

    		 Sends the shift mode signal (E mode or M mode).

    Shift lock solenoid

    (built into shift lock control unit assembly)

    		 Actuated by the TCM. Restricts the movement of the shift lever.

    Shift motor

    (built into shift and select actuator)

    		 Actuated by the TCM. Performs the shift operation of the shift and select lever shaft.*

    Shift stroke sensor

    (built into shift and select actuator)

    		 Detects the shift and select actuator operation position (shift direction).*

    Select motor

    (built into shift and select actuator)

    		 Actuated by the TCM. Performs the select operation of the shift and select lever shaft.*

    Select stroke sensor

    (built into shift and select actuator)

    		 Detects the shift and select actuator operation position (select direction).*

    Clutch motor

    (built into clutch actuator)

    		 Actuated by the TCM. Engages and disengages the clutch.

    Clutch stroke sensor

    (built into clutch actuator)

    		 Detected by the stroke sensor which is linked to the clutch master cylinder, and sends the clutch position signal to the TCM.
    Transmission revolution sensor Detects the input shaft speed of the transaxle and transmits it to the TCM.

    Neutral position switch

    (built into transaxle assembly)

    		 Detects whether the transaxle gear is in neutral.

    Back-up light switch

    (built into transaxle assembly)

    		 Detects whether the transaxle gear is in reverse, and illuminates the back-up lights.
    Stop light switch Detects whether the brake pedal is depressed or released.
    Parking brake switch Detects whether the parking brake lever is applied.
    Pattern select (Es) switch Sends a pattern select switch condition signal to the TCM to switch the driving pattern between easy (E) mode and easy sports (Es) mode.
    TCM

    Controls the multi-mode manual transaxle system and signals the ECM to perform engine control during up-shifting or down-shifting via CAN (Controller Area Network) communication.

    When the multi-mode manual transaxle system malfunctions, the ECU determines the malfunctioning areas and stores DTCs. Furthermore, the multi-mode manual transaxle warning light and MIL (malfunction indicator lamp) are illuminated to inform the driver of malfunctions in the system.
    ECM

    Sends sensor information via CAN communication to the TCM.

    Performs engine control in accordance with signals from the TCM.
    Accelerator pedal position sensor Detects the accelerator pedal position and transmits signals to the ECM.
    Crankshaft position sensor Detects the engine speed and transmits signals to the TCM via the ECM.
    Shift paddle switch Moving the shift lever to M or E enables gear selection. The driver can select gears optionally by operating the "+" or "-" shift paddle switch.

  3. MULTI-MODE MANUAL TRANSAXLE SYSTEM CONTROL

    1. System start

      The multi-mode manual transaxle system starts when the ignition switch is turned to ON. The shift lever can be operated when the ignition switch is ON and the brake pedal is depressed. The engine starts when the engine is started (the ignition switch is operated) with the brake pedal depressed and the gear in neutral.

    2. Start off/reverse assist control

      When the brake pedal is not depressed with the gear in 1st, 2nd or reverse, the clutch is half-engaged, even if the accelerator pedal is not depressed. As a result, the vehicle can creep slowly like an automatic transaxle vehicle. This will assist the vehicle in preparing to move. The take off assist control is canceled while the parking brake switch is ON.

      Tip:

      When shifting to reverse at a vehicle speed of 6 km/h (3.7 mph) or more, the reverse warning buzzer sounds, and the gear does not shift to reverse.

    3. Shift control

      When up-shifting with the accelerator pedal depressed, the ECM restrains engine speed in accordance with the request signal from the TCM.

      1. Automatic shift control (E mode and Es mode)

        When the shift lever is in E, the most appropriate gear is automatically selected in accordance with the accelerator pedal opening angle and vehicle speed. Operating the "+" or "-" shift paddle switch during automatic shift control enables the vehicle to be driven temporarily in a gear selected by the driver. (Automatic shift control will automatically resume.) In addition to this automatic shift control, MMT has kick down control. When the accelerator pedal is fully depressed until it is felt to click, the ECM interprets this as the kick down signal being received. The kick down signal affects the transaxle shift control.

        Shift control can be switched between easy (E) and easy sports (Es) modes by pressing the pattern select switch.

        Easy (E) mode: Automatic shift control with emphasis on fuel economy

        Easy sports (Es) mode: Automatic shift control with emphasis on driving performance

      2. Sequential shift control (M mode)

        Moving the shift lever to M enables the gear selection. The driver can select any gear by moving the shift lever to "+" or "-" , or by operating the "+" or "-" shift paddle switch.

    4. Ascent/descent shift control

      While driving in E mode or Es mode, the system operates to prevent excess shifting and obtain proper driving force and engine brake power by estimating the road inclination based on the vehicle conditions.

      1. Ascent shift control

        On an ascent, up-shifting to the 2nd, 3rd, 4th, 5th or 6th gear is prohibited depending on the degree of road inclination.

      2. Descent shift control

        On a descent, the current gear position is maintained, depending on the degree of road inclination, to obtain engine brake power. When the brake pedal is depressed, the TCM automatically downshifts to improve the vehicle (driving force) control performance.

    5. Delta throttle acceleration control

      The TCM interprets a sudden ON or OFF operation of the accelerator pedal as a request by the driver to accelerate or decelerate, and makes the transaxle down-shift or shift-hold.

      1. Accelerator pedal rapid open control

        When the accelerator pedal is rapidly depressed, the system interprets it as an acceleration demand and advances the down-shift timing.

      2. Accelerator pedal sudden close control

        When the accelerator pedal is suddenly released, the system interprets it as a deceleration demand and ensures the engine brake power without changing gear. This also ensures sufficient driving force for the next acceleration stage.

    6. Control when the vehicle stops (stopping control)

      The TCM automatically disengages the clutch when the input speed of the transmission revolution sensor falls below a specified speed. This enables the vehicle to stop without stalling. If the shift lever is in E or M, the TCM shifts the gear to the most appropriate position when the vehicle speed decreases to less than a specified speed.

      Tip:

      If the shift lever is kept in N for 2 seconds with the brake pedal released at a specified vehicle speed or less, the TCM locks the shift lever to prevent improper shift lever operation. When depressing the brake pedal, the shift lever is unlocked.

    7. Control when the vehicle is parked (parking control)

      When the ignition switch is turned off, the TCM locks the shift lever in the current position and engages the clutch to park the vehicle with the gear engaged.

      Tip:

      The multi-mode manual transaxle system does not have a park position. The vehicle can be parked with the shift lever in any position (N, E, M or R). When the vehicle is parked with the shift lever in a position other than N, the vehicle is parked with the gear engaged. The gear may not engage when the ignition switch is turned off before the gearshift is complete. If the gear is not engaged when the ignition switch is turned off, a buzzer will sound and the gear position indicator will blink to warn the driver.

  4. CLUTCH SYSTEM

    The system uses a clutch release with bearing cylinder assembly driven by hydraulic pressure and controlled by the TCM, and can engage and disengage the clutch disc and flywheel.

    1. The clutch actuator has a clutch master cylinder to convert motor force into hydraulic pressure and drive the concentric sleeve cylinder to engage and disengage the clutch disc to flywheel.

      Clutch stroke is detected by the stroke sensor, which is linked to the clutch master cylinder, and the clutch position signal to the TCM.

  5. MULTI-MODE MANUAL TRANSAXLE SYSTEM REMOVAL AND INSTALLATION PROCEDURES

    The multi-mode manual transaxle differs from the conventional manual transaxle. The following operations are necessary when removing and installing the component parts.

    1. Replacement or removal/installation of multi-mode manual transaxle system parts

      Refer to the respective pages for each part.

    2. Initialization and learning

      1. Initialization of multi-mode manual transaxle system

        • The TCM stores information from each component, such as sensors and motors, to control the system.

        • Sensors and motors that comprise the multi-mode manual transaxle system have individual specification values. The TCM learns and stores these values, and controls the multi-mode manual transaxle system. Therefore, the values stored in the TCM must be cleared when the sensor or actuator is replaced.

        • Learning of the multi-mode manual transaxle system can be performed when there is no learned value in the ECU. It is therefore necessary to perform initialization of the TCM before performing learning of the multi-mode manual transaxle system.

        • For details of replacement, refer to Initialization and Learning.

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      2. Learning of multi-mode manual transaxle system

        • This operation is performed to store the individual specification values of components, such as sensors and actuators, in the TCM.

        • For details of replacement, refer to Initialization and Learning.

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        Note:

        Perform this operation after initialization of the multi-mode manual transaxle system.

    3. Synchronization position calibration

      • The transaxle components have individual specification values. The TCM learns and stores those values, and controls the gearshift accurately. Synchronization position calibration corrects and adjusts the shift points appropriately in accordance with the individual specification values of the components.

      • For details of replacement, refer to Synchronization Position Calibration.

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