Toyota Camry Hybrid AHV40 Manual page 36

TH-36
JTHS II CONTROL SYSTEM
1. General
The THS II control system contains the following components.
Item
THS ECU Control
(See page TH-40)
MG1 and MG2
Main Control
(See page TH-47)
THS II (TOYOTA HYBRID SYSTEM II)
D The THS ECU calculates the target motive force based on the shift position,
the degree to which the accelerator pedal is depressed, and the vehicle speed.
It effects control in order to create the target motive force by optimally
combining the power of MG1, MG2, and the engine.
D The THS ECU calculates the engine motive force based on the target motive
force, which has been calculated based on the requirements of the driver and
the conditions of the vehicle. In order to create this motive force, the THS
ECU appropriately controls the ETCS-i (Electronic Throttle Control
System-intelligent) system, fuel injection volume, injection timing, and
VVT-i (Variable Valve Timing-intelligent) system.
D The THS ECU monitors the SOC of the HV battery and the temperature of
the HV battery, MG1, and MG2, in order to optimally control these items.
D The THS ECU effects monitor control to monitor the conditions of the HV
batteries and cooling fan control to keep the HV battery and DC/DC
converter at a predetermined temperature. Thus, it optimally controls these
components.
D When the shift lever is in the N position, the THS ECU effects shut down
control to electrically stop MG1 and MG2.
D For the purpose of protecting the circuit from high voltages and ensuring the
reliability of the circuit shut down, the THS ECU effects SMR control
through the use of 3 relays to connect and shut down the high-voltage circuit.
D The THS ECU calculates the SOC by estimating the charging and
discharging amperage of the HV battery, in order to effect condition control.
D The THS ECU uses the temperature sensors that are provided on the HV
battery module to monitor the temperature of the HV battery module and
controls its temperature by optimally controlling the dedicated cooling fan.
D The THS ECU controls the DC/DC converter in accordance with the
temperature of the auxiliary battery, in order to control the charging of the
auxiliary battery.
D MG1, which is driven by the engine, generates a high voltage (alternating
current) in order to operate MG2 and charge the HV battery. It Also
functions as a starter to start the engine.
D MG2, which is driven by electrical power from MG1 or the HV battery,
generates a motive force for the front wheels.
D MG2 generates electricity to charge the HV battery (regenerative brake
control) during braking, and when the accelerator pedal is not being
depressed.
D Speed sensors (resolvers) detect the speeds and the rotor positions of MG1
and MG2, and output them to the THS ECU via the MG ECU.
D Temperature sensors mounted on MG1 and MG2 detect the temperatures
and transmit them to the THS ECU.
Outline
(Continued)