Toyota Camry Hybrid AHV40 Manual page 218

JENGINE CONTROL SYSTEM
1. General
D The 2AZ-FXE engine is controlled by the THS ECU. The THS ECU determines the motive force required
by the driver in accordance with the pedal effort applied by the driver on the accelerator. Then, the THS
ECU determines the driving conditions of the vehicle in accordance with the vehicle speed, vehicle load,
and various sensor signals. Furthermore, the THS ECU starts and stops the engine in accordance with the
motive force required by the driver, regardless of the driving conditions, and generates the required engine
motive force.
D The engine control system of the 2AZ-FXE engine has following system.
System
SFI
Sequential Multiport
Fuel Injection
ESA ESA
Electronic
Spark Advance Spark Advance
ETCS-i ETCS-i
Electronic Throttle Control Electronic Throttle Control
System-intelligent System intelligent
[See page EG-43]
VVT-i VVT-i
Variable Valve Variable Valve
Timing intelligent Timing-intelligent
[See page EG-45]
Fuel Pump Control Fuel Pump Control
[See page EG-49]
Cooling Fan Control Cooling Fan Control
[See page EG-50]
Air Fuel Ratio Air Fuel Ratio
Sensor and Oxygen Sensor and Oxygen
Sensor Heater Control
ENGINE - 2AZ-FXE ENGINE
D An L-type SFI system directly detects the intake air mass with a
hot wire type mass air flow meter.
D The fuel injection system is a sequential multiport fuel injection
system.
D Fuel injection takes two forms: D Fuel injection takes two forms:
Synchronous injection, which always takes place with the same
timing in accordance with the basic injection duration and an
additional correction based on the signals provided by the sensors.
Non-synchronous injection, which takes place at the time an
i j ti injection request based on the signals provided by the sensors is t b
detected, regardless of the crankshaft position.
D Synchronous injection is further divided into group injection
during a cold start, and independent injection after the engine is
started.
D Ignition timing is determined by the THS ECU based on signals
from various sensors. The THS ECU corrects ignition timing in from various sensors. The THS ECU corrects ignition timing in
response to engine knocking.
D This system selects the optimal ignition timing in accordance with
Th s system selects the opt mal gn t on t m ng n accordance w th
the signals received from the sensors and sends the (IGT) ignition
signal to the igniter.
O ti Optimally controls the throttle valve opening in accordance with the ll t l th th ttl
amount of accelerator pedal effort and the condition of the engine amount of accelerator pedal effort and the condition of the engine
and the vehicle and the vehicle.
Controls the intake camshaft to an optimal valve timing in Controls the intake camshaft to an optimal valve timing in
accordance with the engine condition. accordance with the engine condition.
D Fuel pump operation is controlled by signals from the THS ECU.
D The fuel pump is stopped when the SRS airbag is deployed in a D The fuel pump is stopped, when the SRS airbag is deployed in a
frontal, side, and rear of side collision.
Cooling fan operation is controlled by signals from the THS ECU
based on the engine coolant temperature, inverter water temperature based on the engine coolant temperature inverter water temperature
and the air conditioning operating condition.
Maintains the temperature of the air fuel ratio sensor or oxygen Maintains the temperature of the air fuel ratio sensor or oxygen
sensor at an appropriate level to increase accuracy of detection of the sensor at an appropriate level to increase accuracy of detection of the
oxygen concentration in the exhaust gas.
Outline
d th i l id d b th
l i i
EG-29
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d ith th
(Continued)