Toyota Camry Hybrid AHV40 Manual page 44

TH-44
3) Power is OFF
D First, the THS ECU turns the SMRG OFF. After it has determined whether the contact points of the
SMRG are stuck, it turns the SMRB OFF.
D Afterwards, the THS ECU turns the SMRP ON in order to determine whether the contact points of
the SMRB are stuck. Then, it turns the SMRP OFF.
D If the THS ECU detects that the contact points are stuck, it illuminates the master warning light and
indicates "CHECK HYBRID SYSTEM" on the multi-information display, and stores a DTC
(Diagnostic Trouble Code) in memory.
SOC Control
D The THS ECU calculates the SOC (state of charge) of the HV battery by estimating its charging and
discharging amperages, in order to effect condition control.
D While the vehicle is in motion, the HV battery undergoes repetitive charging/discharging cycles, as it
becomes discharged by the MG2 during acceleration and charged by the regenerative brake during
deceleration. The THS ECU calculates the SOC based on charging/discharging levels detected by the
current sensor. The THS ECU performs the charging/discharging control based on the calculated value
in order to steady the SOC at its target level anytime.
THS II (TOYOTA HYBRID SYSTEM II)
SMRB (ON)
SMRP (OFF)
SMRG (OFF)
SMRB (OFF)
SMRP (ON)
SMRG (OFF)
Upper SOC control limit
SOC
Lower SOC control limit
Control
Region
Time
SMRB (OFF)
SMRP (OFF)
SMRG (OFF)
SMRB (OFF)
SMRP (OFF)
SMRG (OFF)
Example of change in SOC
Target SOC
Control
182TH12
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