Mazda X-5. Manual — part 41
CONTROL SYSTEM
01–40–37
01–40
GENERATOR CONTROL OUTLINE [LF]
E5U014000000N52
• Idling stability and the corresponding load performance have been improved by optimum control of generator
voltage according to engine operation and electrical load conditions.
• The PCM determines the engine operation and electrical load conditions based on the input signals from input
devices shown in the figure below and controls the excitation time of the generator field coils.
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GENERATOR CONTROL BLOCK DIAGRAM [LF]
E5U014000000N53
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GENERATOR CONTROL OPERATION [LF]
E5U014000000N54
Determination of Field Coil Excitation Time
• By sending a duty signal to the power transistor
built into the generator, the PCM increases and
decreases the field coil excitation current.
• The field coil excitation current changes
according to changes in the power transistor
excitation time by changing the duty signal duty
ratio. For example, when the battery voltage is
low, the duty signal duty ratio sent to power
transistor is higher, and the excitation current to
the field coils increases.
Control
• To maintain optimum battery voltage, the PCM calculates the target excitation current based on the targeted
generator current (target generated current) and the generator rotation speed at the time.
• The generator rotation speed is calculated from the generator pulley and crankshaft pulley ratios, and the
engine speed.
• The PCM compares the target battery voltage (regulating voltage) calculated from the intake airflow
temperature, engine speed and vehicle speed with the current battery voltage and, based on this difference,
calculates the required generator current.
• When an electrical load is applied, the target rotation speed increases during idling because the battery voltage
decreases due to the increased power consumption.
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PCM
IAT SENSOR
ECT SENSOR
CKP SENSOR
VEHICLE SPEED SIGNAL
GENERATOR (TERMINAL
P: STATOR COIL)
BATTERY
FIELD COIL EXCITATION
TIME
TARGET EXCITATION
CURRENT
GENERATOR
ROTATION
SPEED
TARGET GENERATED
CURRENT
TARGET BATTERY VOLTAGE
(REGULATING VOLTAGE)
DEVIATION
CURRENT BATTERY
VOLTAGE
GENERATOR (TERMINAL
D: FIELD COIL)
E5U140ZT5011
1 CYCLE
EXCITATION TIME
C3U0140S029
CONTROL SYSTEM
01–40–38
CONTROLLER AREA NETWORK (CAN) OUTLINE [LF]
E5U014000000N55
• The PCM sends and receives data to and from other modules via the CAN system. Refer to Section 09 for a
detailed explanation of the CAN. (See 09–40–2 CAN SYSTEM DESCRIPTION.)
OUT: Output (sends signal)
IN: Input (receives signal)
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Signal
Multiplex module
PCM
TCM
ABS HU/CM
or DSC HU/
CM
Keyless
control
module
Steering
angle
sensor
Instrument
cluster
Engine speed
OUT
IN
IN (DSC)
IN
–
IN
Vehicle speed
OUT
IN
–
IN
–
IN
IN
OUT
–
–
Engine coolant temperature
OUT
IN
–
–
–
IN
Engine torque
OUT
IN
IN (DSC)
–
–
–
Accelerator pedal position
OUT
IN
IN (DSC)
–
–
–
TP
OUT
IN
IN (DSC)
–
–
–
Intake air temperature
OUT
IN
–
–
–
–
Ignition timing
OUT
IN
–
–
–
–
Engine specification
OUT
–
IN
–
–
–
Brake pedal position
OUT
IN
–
–
–
–
Tire circumference (front/rear)
OUT
IN
IN
–
–
–
IN
–
OUT
Immobilizer related information
OUT
–
–
–
–
IN
IN
–
OUT
Travelled distance
OUT
–
–
–
–
IN
IN
OUT
–
Fuel injection amount
OUT
–
–
–
–
IN
MIL on request
OUT
–
–
–
–
IN
–
OUT
Generator warning light on request
OUT
–
–
–
–
IN
Cruise main/set indicator light on
request
OUT
–
–
–
–
IN
AT gear position/selector lever
position (AT)
IN
OUT
–
–
–
IN
ATF temperature (AT)
IN
OUT
–
–
–
–
Desired gear position (AT)
IN
OUT
IN (DSC)
–
–
–
TCC status (AT)
IN
OUT
IN (DSC)
–
–
–
AT warning light on request (AT)
IN
OUT
–
–
–
IN
Brake system status (EBD/ABS/
DSC)
IN
–
OUT
–
–
–
Wheel speed (LF, RF, LR, RR)
IN
–
OUT
–
–
–
Brake system warning light on
request
–
–
OUT
–
–
IN
ABS warning light on request
–
–
OUT
–
–
IN
DSC indicator light on request
–
–
OUT (DSC)
–
–
IN
DSC OFF light on request
–
–
OUT (DSC)
–
–
IN
Security light on request
–
–
–
OUT
–
IN
Steering angle sensor status
–
–
IN (DSC)
–
OUT
–
Fuel tank level
IN
–
–
–
–
OUT
Parking brake position
–
–
IN (DSC)
–
–
OUT
CONTROL SYSTEM
01–40–39
01–40
PCM FUNCTION [LF]
E5U014018880N01
Function List
• The control descriptions are as shown below.
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PCM CONSTRUCTION/OPERATION [LF]
E5U014018880N02
Structure
• A 120-pin (two-block) PCM connector has been adopted.
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Function
Description
Main relay control
When the ignition switch is turned to the ON position, the main relay turns on.
Drive-by-wire control
The drive-by-wire control calculates the optimum target throttle valve opening angle at all
ranges of engine speeds and controls the throttle valve actuator.
Drive-by-wire relay control
Supplies power to the drive-by-wire control.
Variable intake air control
Switches energization of the variable shutter valve actuator according to engine speed to
enhance the inertia charging effect.
Variable valve timing control
Changes the intake valve timing according to engine operation conditions to improve engine
output, fuel economy and exhaust emission performance.
Fuel injection control
Performs optimum fuel injection according to engine operation conditions.
Fuel pump control
Performs energization of the fuel pump relay only when the engine is running (operates fuel
pump) to improve stability and durability.
ESA control
Controls ignition to optimum timing according to engine operation conditions.
Evaporative purge control
An appropriate amount of evaporative gas is fed into the dynamic chamber by the driving of the
purge solenoid valve according to the engine operation conditions to ensure driveability and
prevent release of fuel vapor gas into the atmosphere.
EGR control
Adjusts the EGR to the optimum opening angle according to engine operation conditions.
HO2S heater control
Based on the control of the front and rear HO2S heater, a stabilized oxygen concentration is
detected even at low exhaust gas temperature and feedback control of fuel injection even
during cold engine start is made possible for improved cold temperature emission performance.
A/C cut-off control
The current application (energize/non-energize) to the A/C relay (magnetic clutch) is controlled
according to the engine operation conditions to prevent deterioration of engine performance,
damage to the engine, and deterioration of the A/C function.
Electrical fan control
Through cooling of the radiator and condenser by operation of the cooling fan according to
vehicle conditions, engine reliability and cooling performance have been improved.
Starter cut-off control
Theft deterrence has been improved by controlling energization to the starter relay according to
an engine stop request signal from the immobilizer system.
Generator control
Generator output is optimized according to the engine operation and electrical load conditions,
ensuring idling stability and anti-load performance.
CAN
Used for communication with the EHPAS control module, ABS HU/CM, instrument cluster and
DLC-2.
CONTROL SYSTEM
01–40–40
NEUTRAL SWITCH FUNCTION [LF]
E5U014017640N01
• The neutral switch detects the neutral position of the gearshift lever.
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NEUTRAL SWITCH CONSTRUCTION/OPERATION [LF]
E5U014017640N02
• When the shift lever is in the neutral position, the contact closes (ON) and the PCM detects a voltage of 0 V. When
the shift lever is not in the neutral position, the contact opens (OFF) and the PCM detects a voltage of 12 V.
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CLUTCH PEDAL POSITION (CPP) SWITCH FUNCTION [LF]
E5U014018660N01
• This switch determines whether the engine is under a load condition (condition in which the engine output is
transmitted to the powertrain) or under a no-load condition (condition in which the engine output is not
transmitted to the powertrain).
• Detects the clutch engagement condition.
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CLUTCH PEDAL POSITION (CPP) SWITCH CONSTRUCTION/OPERATION [LF]
E5U014018660N02
• When the clutch pedal is depressed, the contact closes (ON) and the PCM detects a voltage of 0 V. When the
clutch pedal is not depressed, the contact opens (OFF) the PCM detects a voltage of 12 V.
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NEUTRAL SWITCH
PUSH ON
OTHER THEN
NEUTRAL (OFF)
NEUTRAL (ON)
NEUTRAL (ON)
EXCEPT ABOVE
PCM
NO LOAD
LOAD
CPU
C3U0140S030
CPP SWITCH
PUSH OFF
PCM
CLUTCH PEDAL NOT
DEPRESSED (OFF)
CLUTCH PEDAL NOT
DEPRESSED (OFF)
CLUTCH PEDAL
DEPRESSED (ON)
CLUTCH PEDAL
DEPRESSED (ON)
NO LOAD
LOAD
CPU
C3U0140S031
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