Toyota 4Runner: System Description

Neural Network Control

This control is capable of performing complex control by artificially simulating the information processing method of the nervous system of living organisms in order to establish a complex input/output relationship similar to that of a human brain.

Outlet Air Temperature Control

Based on the temperature set by the temperature control dial, neural network control calculates outlet air temperature based on input signals from various sensors.

Left and Right Independent Control

The temperature settings for the driver and front passenger are controlled independently in order to provide separate vehicle interior temperatures for the right and left sides of the vehicle.

Blower Control

Controls the blower motor in accordance with the airflow volume that has been calculated by neural network control based on the input signals from various sensors.

Air Outlet Control

Automatically switches the air outlets in accordance with the outlet mode that has been calculated by neural network control.

In accordance with the engine coolant temperature, ambient air temperature, amount of sunlight, required blower speed, outlet temperature and vehicle speed conditions, this control automatically switches the blower outlet to foot and defroster mode to prevent the windows from becoming fogged up when the ambient air temperature is low.

Air Inlet Control

Automatically controls the air inlet control damper to help achieve the calculated outlet air temperature that is required.

Drives the air inlet control servo motor according to the operation of the air inlet control switch and moves the dampers to the fresh or recirculation position.

Compressor Control

The air conditioning amplifier assembly compares the A/C pulley speed signals, which are transmitted by the ECM (crankshaft position sensor). When the air conditioning amplifier assembly determines that the A/C pulley is locked, it turns off the magnet clutch assembly.

Defroster Control

Defroster control logic is used to improve defroster performance.

Rear Defogger Control

When the ignition switch is ON and the rear defogger switch is pushed, the system is activated to keep the defogger heater on for approx. 15 minutes. However, the operating time of the rear defogger can be extended up to approx. 255 minutes when both of the following requirements are met:

Diagnosis

A Diagnostic Trouble Code (DTC) is stored in memory when the air conditioning amplifier assembly detects a problem with the air conditioning system.

Air Inlet Control Damper

Fresh

A

Brings in fresh air.

Recirculation

B

Recirculates internal air.

Air Mix Control Damper

MAX COOL to MAX HOT

E - D - C

E' - D' - C'

Varies the mixture of cold air and hot air in order to regulate the temperature continuously from hot to cool.

MAX COOL Damper

MAX COOL

V

Open in the MAX COOL position.

Except MAX COOL

W

Close in all position except MAX COOL position.

MAX HOT Damper

MAX HOT

Y

Open in the MAX HOT position.

Except MAX HOT

X

Closed in all position except MAX HOT position.

Mode Control Damper

Face

F, I, N, T, X (FACE 1)

F, J, N, T, X (FACE 2)

Air blows out of the front center registers, side registers and rear face registers. (FACE 1)

Air blows out of the front center registers, side registers and rear face registers. In addition, air blows out slightly from the front and rear footwell register ducts. (FACE 2)

Bi-level

G, L, N, T, X

Air blows out of the front center registers, side registers, rear face registers and front and rear footwell register ducts.

Foot

H, M, P, T, W, Y (MAX HOT position)

H, M, O, T, X (Except MAX HOT Position)

Air blows out of the front and rear footwell register ducts.

In addition, air blows out slightly from the front defroster, side registers, front center registers and rear face registers.

Foot/Def

H, K, R, T, W, Y (MAX HOT position)

H, M, Q, T, X (Except MAX HOT Position)

Defrosts the windshield through the front defroster and side registers while air is also blown out from the front and rear footwell register ducts.

In addition, air blows out slightly from the front center registers and rear face registers.

Def

H, I, S, U, X

Defrosts the windshield through the front defrosters.

Face 1

-

-

-

Face 2

-

Bi-level

-

Foot

Foot/Def

Def

-

-

-

-

-

*1: Bus connector

Damper servo sub-assembly LH (driver side air mix damper servo)

*2: Bus connector

Damper servo sub-assembly LH (mode damper servo)

*3: Bus connector

Damper servo sub-assembly RH (front passenger side air mix damper servo)

*4: Bus connector

Recirculation damper servo sub-assembly

*5: Connector

Air conditioning amplifier assembly

*6: Connector

No. 1 cooler thermistor