2013 Toyota Prius FiveFACTORY OEM SERVICE PROCEDURE

System Description

WARNING: This page is about a different variant/trim than selected.
  1. OPERATION 
    1. Operation of Plug-in Hybrid Vehicle
      1. The plug-in hybrid system uses motive force provided by the engine and MG2, and it uses MG1 as a generator. The system optimally combines these forces in accordance with various driving conditions.
      2. The power management control ECU constantly monitors the engine coolant temperature, SOC, HV battery temperature and electrical load conditions. If any of the monitoring conditions fails to satisfy the requirements, and when the vehicle is in the READY-on state and the shift position is any position other than N, the power management control ECU starts the engine.
      3. This system drives the vehicle by optimally combining the operations of the engine, MG1 and MG2 in accordance with the driving conditions listed below. The vehicle conditions listed below are examples of typical vehicle driving conditions.
        Fig 1: Identifying EV & HV Driving Modes
        GTY340048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Driving Condition
        A READY-on State
        B Starting Off
        C Constant-speed Cruising in EV Mode
        D Normal Acceleration in EV Mode
        E Constant-speed Cruising in HV Mode
        F During Full Throttle Acceleration with Engine Running
        G During Deceleration
        H During Reverse
    2. Driving Condition B*: Starting Off
      1. When the vehicle is started off, the vehicle operates powered by MG2. If the required drive torque increases when running with MG2 only, MG1 is activated to start the engine.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 2: Identifying Hybrid Control System Components & Power Flow
        GTY331255Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Stopped) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Rotates Freely) *4 MG2 (Drive)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission - -
    3. Driving Condition C*: Constant-speed Cruising in EV Mode / Driving Condition D*: Normal Acceleration in EV Mode
      1. During constant-speed cruising in EV mode (Driving Condition C) and normal acceleration in EV mode (Driving Condition D), the vehicle runs with only the motive force of MG2, powered by the plug-in charged HV battery.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 3: Identifying Hybrid Control System Components & Power Flow
        GTY331256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Stopped) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Rotates Freely) *4 MG2 (Drive)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission - -
    4. Driving Condition E*: Constant-speed Cruising in HV Mode
      1. When driving at high speed or with constant-speed cruising after EV mode driving finishes, the motive force of the engine is transmitted by the power split planetary gear unit. Some of this motive force is output directly, and the remaining motive force is used for generating electricity through MG1. Through the use of the electrical power path of the inverter with converter assembly, this electrical power is transmitted to MG2 to be output as the motive force of MG2. If the SOC level of the HV battery is low, it is charged by MG1 driven by the engine.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 4: Identifying Hybrid Control System Components & Power Flow
        GTY336132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Drive) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Generates Electricity) *4 MG2 (Drive)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission Power Transmission at Low SOC Level
    5. Driving Condition F*: During Full Throttle Acceleration with Engine Running
      1. During EV mode, full throttle acceleration will cause the engine to start. The engine power will be transmitted to the wheels as motive force. Furthermore, MG1 will also be actuated to generate electrical power. In addition to the engine, the motive force of MG2, powered by the HV battery and MG1, accelerates the vehicle.
      2. When the vehicle driving condition changes from low load cruising to full-throttle acceleration, the system supplements the motive force of MG2 with electrical power from the HV battery.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 5: Identifying Hybrid Control System Components & Power Flow
        GTY335384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Drive) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Generates Electricity) *4 MG2 (Drive)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission - -
    6. Driving Condition G*: During Deceleration
      1. While the vehicle decelerates with drive (D) selected, the engine is turned off and the motive force changes to zero. At this time, the wheels drive MG2, causing MG2 to operate as a generator, charging the HV battery. If the vehicle decelerates from a higher speed, the engine maintains a predetermined speed without stopping, in order to protect the planetary gears.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 6: Identifying Hybrid Control System Components & Power Flow
        GTY330368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Stopped) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Rotates Freely) *4 MG2 (Generates Electricity)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission - -
    7. Driving Condition H*: During Reverse
      1. When the vehicle is being driven in reverse, the required power is supplied by MG2. At this time, MG2 rotates in the opposite direction, the engine remains stopped, and MG1 rotates in the normal direction without generating electricity.

        HINT: 

        *: Refer to the preceding driving condition graph and table for more details.

        Fig 7: Identifying Hybrid Control System Components & Power Flow
        GTY338061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Engine (Stopped) *2 Hybrid Vehicle Transaxle Assembly
        *3 MG1 (Rotates Freely) *4 MG2 (Drive)
        *5 Power Split Planetary Gear Unit *6 Motor Speed Reduction Planetary Gear Unit
        *7 Inverter with Converter Assembly *8 HV Battery
        Mechanical Power Path Electrical Power Path
        Power Transmission - -
  2. SYSTEM DIAGRAM 
    Fig 8: Identifying Hybrid Control System Diagram (1 Of 2)
    GTY341144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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