Toyota CH-R Service Manual: System Description

SYSTEM DESCRIPTION

GENERAL

The air conditioning system has the following controls.

Control

Outline

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. Thus, air conditioning that accommodates the occupants' preferences has been realized.

Blower Control

Controls the blower motor in accordance with the airflow volume that has been calculated by neural network control based on 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, outlet temperature and vehicle speed conditions, this control automatically switches the blower outlet to foot/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.

Variable Capacity Compressor Control

Controls the compressor with pulley assembly to turn it on or off and adjust the discharge capacity based on the signals from various sensors.

Defroster Control

Defroster control logic is used to improve defroster performance.

PTC Heater Control

When the engine is running and the blower motor with fan sub-assembly is turned on, the air conditioning amplifier assembly turns on the quick heater assembly if the conditions listed below are met:

  • Engine coolant temperature is below the specified temperature.
  • Outside temperature is below the specified temperature.
  • Tentative air mix damper opening angle is above the specified value (MAX HOT).

ECO Mode Control

When the air conditioning control assembly (ECO mode switch) is turned on, the air conditioning amplifier assembly limits the air conditioning system performance.

Parking Fresh Control

By automatically switching to fresh air mode when the vehicle is parked. Ventilation of the parked vehicle is facilitated and outside air is introduced into the air conditioner unit assembly.

Diagnosis

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

NEURAL NETWORK CONTROL

  • In previous automatic air conditioning systems, the air conditioning amplifier assembly determined the required outlet air temperature and blower air volume in accordance with the calculation formula that has been obtained based on information received from the sensors.

    However, because the senses of a person are rather complex, a given temperature is sensed differently, depending on the environment in which the person is situated. For example, a given amount of solar radiation can feel comfortably warm in a cold climate, or extremely uncomfortable in a hot climate. Therefore, as a technique for effecting a higher level of control, a neural network has been adopted in the automatic air conditioning system. With this technique, the data that has been collected under varying environmental conditions is stored in the air conditioning amplifier assembly. The air conditioning amplifier assembly can then effect control to provide enhanced air conditioning comfort.

  • The neural network control consists of neurons in the input layer, intermediate layer and output layer. The input layer neurons process the input data of the outside temperature, the amount of sunlight and the room temperature based on the outputs of the switches and sensors, and output them to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The sum of these is then calculated by the output layer neurons in the form of the required outlet temperature, solar correction, target airflow volume and outlet mode control volume. Accordingly, the air conditioning amplifier assembly controls the servo motors and blower motor in accordance with the control volumes that have been calculated by the neural network control.

MODE POSITION AND DAMPER OPERATION

Mode Position and Damper Operation

*1

Driver Side Air Mix Control Damper

*2

Front Passenger Side Air Mix Control Damper

*3

Driver Side Defroster

*4

Front Defroster

*5

Front Passenger Side Defroster

*6

Air Inlet Control Damper (Lower Side)

*7

Air Inlet Control Damper (Upper Side)

*8

Clean Air Filter

*9

Blower with Fan Motor Sub-assembly

*10

No. 1 Cooler Evaporator Sub-assembly

*11

Air Mix Control Damper

*12

Heater Radiator Unit Sub-assembly

*13

Mode Switching Damper

*14

Driver Side Footwell Register

*15

Front Passenger Side Footwell Register

*16

Driver Side Register

*17

Center Register

*18

Front Passenger Side Register

*19

Quick Heater Assembly

*20

Rear Footwell Register LH

*21

Rear Footwell Register RH

-

-

*a

Illustration Image View from [A]

*b

[A] View

*c

Recirculated Air

*d

Fresh Air

Functions of Main Dampers

Control Damper

Operation Position

Damper Position

Operation

Air Inlet Control Damper

FRESH

A1, B1

Allows fresh air to enter.

RECIRCULATION

A2, B2

Causes internal air to recirculate.

Air Mix Control Damper

Temperature Setting: 16°C (61°F) to 30°C (86°F)

C1 - C2

Varies the driver side mixture ratio of the fresh air and the recirculation air in order to regulate the temperature continuously from HI to LO.

D2 - D1

Varies the front passenger side mixture ratio of the fresh air and the recirculation air in order to regulate the temperature continuously from HI to LO.

Air Outlet Control Damper

DEF

F, H, K

Defrosts the windshield through the center defroster, side defrosters and side registers.

FOOT/DEF

F, H, J to K

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

FOOT

E, (E to F)*, H, J

Air blows out of the front and rear footwell register ducts and side registers. In addition, air blows out slightly from the center defroster and side defrosters.

B/L

E, G to I, J to K

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

FACE

E, G, K

Air blows out of the center registers and side registers.

AIR OUTLETS AND AIRFLOW VOLUME

The size of each circle ○ indicates the ratio of airflow volume.

(a) Air Outlets and Airflow Volume.

Mode

FACE

FOOT

DEF

Center

Side

Front

Rear

Center

Side

A

B

C

D

D

E

FACE

B/L

FOOT

FOOT/DEF

DEF

FRESH AIR INTRODUCTION WHILE PARKING CONTROL

When 60 seconds have elapsed since the ignition switch has been turned off, the air conditioning amplifier assembly uses control logic which automatically changes the air inlet to FRESH mode to purge undesired odors from the air conditioning unit.

This logic will therefore reduce undesired odors upon starting the air conditioning system.

COMPRESSOR WITH PULLEY

(a) General:

(1) The compressor is a continuously variable capacity type in which its capacity can be varied in accordance with the cooling load of the air conditioning system.

*1

Shoe

*2

Crank Chamber

*3

Shaft

*4

Lug Plate

*5

Piston

*6

Cylinder

*7

Solenoid Control Valve

-

-

(b) Solenoid Valve Operation:

(1) The crank chamber is connected to the suction passage. A solenoid valve is provided between the suction passage (low pressure) and the discharge passage (high pressure).

(2) The solenoid valve operates under duty cycle control in accordance with the signals from the air conditioning amplifier assembly.

*1

Suction Passage

*2

Crank Chamber

*3

Piston

*4

Discharge Passage

*5

Solenoid Control Valve

*6

Air Conditioning Amplifier Assembly

(3) When the solenoid control valve closes (the solenoid coil is energized), a difference in pressure is created and the pressure in the crank chamber decreases. Then, the pressure applied to the right side of the piston becomes greater than the pressure applied to the left side of the piston. This compresses the spring and tilts the lug plate. As a result, the piston stroke increases and the discharge capacity increases.

*1

Suction Passage

*2

Crank Chamber

*3

Piston

*4

Discharge Passage

*5

Solenoid Control Valve

*6

Air Conditioning Amplifier Assembly

*a

Crank Chamber Pressure + Spring Force

*b

Piston Stroke: Large

(4) When the solenoid control valve opens (the solenoid coil is not energized), the difference in pressure disappears. Then, the pressure applied to the left side of the piston becomes the same as the pressure applied to the right side of the piston. Thus, the spring elongates and eliminates the tilt of the lug plate. As a result, there is a small piston stroke and the discharge capacity decreases.

*1

Suction Passage

*2

Crank Chamber

*3

Piston

*4

Discharge Passage

*5

Solenoid Control Valve

*6

Air Conditioning Amplifier Assembly

*a

Crank Chamber Pressure + Spring Force

*b

Piston Stroke: Small

NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)

The No. 1 cooler thermistor (evaporator temperature sensor) detects the temperature of the cool air immediately after the evaporator in the form of resistance changes, and outputs it to the air conditioning amplifier assembly.

BLOWER MOTOR WITH FAN SUB-ASSEMBLY

The blower motor has a built-in blower controller, and is controlled using duty control performed by the air conditioning amplifier assembly.

SERVO MOTOR

A pulse pattern type servo motor consists of a printed circuit board and a servo motor. The printed circuit board has three contact points, and can transmit two ON-OFF signals to the air conditioning amplifier assembly based on the difference of the pulse phases. The bus connector can detect the damper position and movement direction with these signals.

COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

The cooler thermistor (room temperature sensor) detects the cabin temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.

THERMISTOR ASSEMBLY

The thermistor assembly detects the outside temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.

AUTOMATIC LIGHT CONTROL SENSOR

The automatic light control sensor detects (in the form of changes in the current that flows through the built-in photo diode) the changes in the amount of sunlight and outputs these sunlight strength signals to the air conditioning amplifier assembly.

AIR CONDITIONER PRESSURE SENSOR

The air conditioner pressure sensor detects the refrigerant pressure and outputs it to the air conditioning amplifier assembly in the form of voltage changes.

QUICK HEATER ASSEMBLY

(a) General

(1) The quick heater assembly is located above the heater core in the air conditioning radiator assembly.

(2) The quick heater assembly consists of a PTC element, aluminum fins, and brass plates. When current is applied to the PTC element, it generates heat to warm the air that passes through the unit.

*1

Quick Heater Assembly

*2

Brass Plate

*3

PTC Element

*4

Aluminum Fin

(b) Quick Heater Assembly Operating Conditions

(1) The quick heater assembly is turned on and off by the air conditioning amplifier assembly in accordance with the engine coolant temperature, ambient temperature, temperature setting, and electrical load (generator power ratio).

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