LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2012 >> HS 250h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostics - Introduction) >> Hybrid Control System >> System Description >> System Description

System Description

  1. BASIC OPERATION 

    This system generates a motive force by combining the engine, MG1, and MG2 in accordance with the driving conditions. Representative examples of the various combinations are described below.

    1. Starting (Driven by MG2)

      Supply of electrical power from the HV battery to MG2 provides force to drive the front wheels.

      Fig 1: Identifying Starting (Driven By MG2)
      GTY260372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. During Acceleration with Engine

      While the front wheels are being driven by the engine via the planetary gears, MG1 is also being driven by the engine via the planetary gears, in order to supply the electricity that MG1 generates to MG2.

      Fig 2: Identifying During Acceleration With Engine
      GTY280952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Charging the HV Battery

      MG1 is rotated by the engine via the planetary gears, in order to charge the HV battery.

      Fig 3: Identifying Charging The HV Battery
      GTY267854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. During Deceleration

      When the vehicle is decelerating, kinetic energy from the front wheels is recovered and converted into electrical energy by means of MG2, and used to recharge the HV battery.

      Fig 4: Identifying During Deceleration
      GTY260147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. SYSTEM DIAGRAM 
    Fig 5: Identifying HV Battery System Diagram
    GTY279696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. FUNCTION OF MAIN COMPONENTS 
    Component Function
    Hybrid Vehicle Control ECU Performs comprehensive control of the hybrid system.
    • Information from various sensors as well as from ECUs (MG ECU, battery smart unit and skid control ECU) is received, and based on this, the required torque and output power is calculated. The hybrid vehicle control ECU transmits the calculated result to the MG ECU and skid control ECU.
    • Activates the ETCS-i (Electronic Throttle Control System-intelligent) in accordance with the target engine speed and required engine motive force.
    • Monitors the SOC of the HV battery.
    • Controls the DC-DC converter.
    • Controls the HV water pump with motor.
    • Controls the HV battery cooling blower.
    Hybrid Vehicle Transaxle Assembly Motor Generator 1 (MG1) MG1, which is driven by the engine, generates high-voltage electricity in order to operate MG2 and charge the HV battery. Also, it functions as a starter to start the engine.
    Motor Generator 2 (MG2)
    • MG2, which is driven by electrical power from MG1 and the HV battery, generates motive force for the drive wheels.
    • During braking, or when the accelerator pedal is not depressed, it generates high-voltage electricity to recharge the HV battery.
    Resolver (for MG1/for MG2) Detects the rotor position, rotational speed and direction of MG1 and MG2.
    Temperature Sensor (for MG1/for MG2) Detects the temperature of MG1 and MG2.
    Compound Gear Unit Power Split Planetary Gear Unit Distributes the engine motive force as appropriate to directly drive the vehicle as well as MG1.
    Motor Speed Reduction Planetary Gear Unit Reduces the rotational speed of MG2 in accordance with the characteristics of the planetary gear, in order to increase torque.
    Inverter with Converter Assembly Inverter Converts the direct current from the boost converter into the alternating current for MG1 and MG2, and vice versa (from AC to DC).
    Boost Converter Boosts the maximum voltage of the HV battery from DC 244.8 to DC 650 V and vice versa (drops DC 650 V to DC 244.8 V).
    MG ECU Controls the inverter and boost converter in accordance with the signals received from the hybrid vehicle control ECU, thus operating MG1 and MG2 as either a generator or motor.
    Temperature Sensor (for Inverter with Converter Assembly) Detects temperatures in the parts of the inverter with converter assembly as well as the HV coolant temperature.
    Inverter Current Sensor Detects the current of MG1 and MG2.
    HV Battery Assembly HV Battery (Battery Modules)
    • Supplies electrical power to MG1 and MG2 in accordance with the driving conditions of the vehicle.
    • Recharged by MG1 and MG2 in accordance with the SOC and the driving conditions of the vehicle.
    HV Battery Temperature Sensors Detects temperatures in the parts of the HV battery and the intake air temperature from the HV battery cooling blower.
    Hybrid Vehicle Converter (DC/DC Converter) Converts a voltage of DC 244.8 V into a DC voltage between 12 V and 14 V in order to supply electricity to body electrical components, as well as to recharge the auxiliary battery (DC 12 V). Contains SMRP.
    Hybrid Battery Junction Block Assembly System Main Relays Connects and disconnects the high-voltage power circuit between the HV battery and the inverter with converter assembly, through the use of the signals from the hybrid vehicle control ECU. Contains SMRB and SMRG.
    HV Battery Current Sensor Detects the input and output current of the HV battery.
    Battery Smart Unit
    • Monitors the conditions of the HV battery such as voltage, current and temperature, and transmits this information to the hybrid vehicle control ECU.
    • Monitors the high-voltage system for breakdown of the electrical insulation.
    Service Plug Grip Shuts off the high-voltage circuit of the HV battery when the service plug grip is removed for vehicle inspection or maintenance.
    Interlock Switch
    (for A/C Fuse Cover and Service Plug Grip)    		 Verifies that the cover of both the inverter and the service plug grip have been installed.
    Power Cable Connects the HV battery, inverter with converter assembly, hybrid vehicle transaxle assembly and cooler compressor with motor assembly.
    Water Pump with Motor Assembly Operates based on signals from the hybrid vehicle control ECU in order to cool the inverter with converter assembly and MG1.
    HV Battery Cooling Blower Operates based on signals from the hybrid vehicle control ECU in order to cool the HV battery.
    Auxiliary Battery Charged by HV battery power via the hybrid vehicle converter (DC/DC converter). Supplies power to the audio system, air conditioning system (except the electric inverter compressor) and the ECUs.
    Auxiliary Battery Thermometer (Temperature) Sensor Detects the temperature of the auxiliary battery.
    Accelerator Pedal Sensor Assembly Converts the accelerator pedal position into an electrical signal and outputs it to the hybrid vehicle control ECU.
    Shift Lever Position Sensor Converts the shift lever operation into an electrical signal and outputs it to the hybrid vehicle control ECU.
    P Position Switch (Transmission Shift Main Switch) Outputs the P position switch signal to the hybrid vehicle control ECU when operated by the driver.
    Combination Switch Assembly EV Switch Outputs the EV drive mode switch signal to the hybrid vehicle control ECU when operated by the driver.
    PWR MODE Switch Outputs the PWR MODE switch signal to the hybrid vehicle control ECU when operated by the driver.
    ECO MODE Switch Outputs the ECO MODE switch signal to the hybrid vehicle control ECU via the air conditioning amplifier when operated by the driver.
    Air Conditioning Amplifier Assembly Transmits various A/C state signals to the hybrid vehicle control ECU.
scientia non olet · About LEMON Manuals