Download Bosch Motronic MED 9.1 OBD System Strategy PDF

TitleBosch Motronic MED 9.1 OBD System Strategy
File Size916.8 KB
Total Pages104
Table of Contents
                            .01.00.00 Catalyst Monitoring
	
	.01.01.00 Passive measurement of amplitude ratio
		.01.01.01 General description
	
		
		
		.01.01.02 Monitoring Structure
		
		
		.01.01.03 Flow Chart Catalyst  Monitoring
		
	
	.01.02.00 Active measurement of OSC
		.01.02.01 General description
		.01.02.02 Monitoring Structure
			main-catalyst
				catalyst-system
		
		.01.02.03 Flow Chart Catalyst  Monitoring
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	.02.00.00 Heated Catalyst Monitoring
	.03.00.00 Misfire Monitoring
		.03.00.01 General Description
			
			.03.01.02 Monitoring function description
		
		
			.03.00.03 Chart(s) and Flow Chart(s)
	
	.04.00.00 Evaporative System Diagnosis
		.04.01.00 Leakage Check
			.04.01.01 General description
			
			
			.04.01.02 Monitoring function description
			
			
			.04.01.03 Chart(s) and flow chart(s)
		
		
		.04.02.00 Purge Check
			.04.02.01 General description
			
			.04.02,02 Monitoring function description
			.04.02.03 Chart(s) and flow chart(s)
	.05.00.00 Secondary Air System Monitoring
	.06.00.00 Fuel System Monitoring
		.06.01.00 General Description
			.06.00.02 Monitoring function description
		
		
			.06.00.03 Chart(s) and flow chart(s)
		
	.06.04.00 Fuel Pressure Monitoring
		.06.05.00 General Description
			.06.05.00 Monitoring function description
		
	.07.00.00   Oxygen Sensor Monitoring
		.07.01.00 Calibrations with  ASIC CJ 110
			.07.01.01 General Description
			.07.01.02 Monitoring function description
			.07.01.03 Chart(s) and flow chart(s)
		.07.02.00  Oxygen Sensor Heater Monitoring
			.07.03.01 General description (ASIC CJ 110)
			.07.02.02 Monitor function description
			
			
			07.02.03 Chart(s) and Flow Chart(s)
			
			.07.03.01 General Description
			.07.03.02 Monitor function description
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			.07.03.03 Chart(s) and Flow Chart(s)
		
		
		
		
		
		
		
		
		.07.04.00  Oxygen Sensor Heater Monitoring (ASIC CJ 125/120)
			.07.04.01 General description
			.07.04.02 Monitor function description
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			
			.07.04.03 Chart(s) and Flow Chart(s)
		.07.05.00 SULEV applications
			.07.05.01 General description
			.07.05.02 Monitor function description
			.07.05.03 Chart(s) and flow chart(s)
		.07.06.00  Oxygen Sensor Heater Monitoring  (SULEV)
			.07.06.01 General description
			.07.06.02 Monitor function description)
			
			
			.07.06.03 Chart(s) and Flow Chart(s)
	.08.00.00 EGR MONITORING
	.09.00.00 PCV Monitoring
	
	.10.00.00 Engine Coolant System Monitoring
		.10.01.00 General description
			
			
			.10.01.02  Monitor Functional Description
			
			.10.03.00 Charts and Flow Charts
		
		
		
		
		
		
		
		
		
			
		
	.11.00.00  Cold Start Emission Reduction Strategy Monitoring
		.11.01.00 General Description
			.11.02.00 Monitoring function description
			
			
			.11.03.00 Charts and flow charts
			
	.12.00.00 Air Conditioning (A/C) System Component Monitoring
	.13.00.00 Variable Valve Timing and/or Control (VVT) System Monitoring
		.13.01.00 General Description
			.13.02.00 Monitor function description
			
			.13.03.00 Charts and flow charts
	.14.00.00 Direct Ozone Reduction (DOR) System Monitoring
	.15.00.00 Particulate Mater (PM) Trap Monitoring
	.16.00.00 Comprehensive Components  Monitoring
		.16.01.00 Injection Valve
		.16.02.00 Fuel  Pump Relay
		.16.03.00 Idle Controller
		.16.04.00 Engine Speed Sensor:
		.16.05.00 Warm-up Bypass valve:
		.16.06.00 Signal  Range Check for different sensor
		
		
		
		
		.16.07.00 Rationality  Mass Air Flow Sensor (MAF)
		
		.16.08.00 Vehicle Speed Sensor (VSS)
		
		.16.09.00 Throttle Position Sensor  (throttle unit with E-gas actuator)
		.16.10.00 Accelerator pedal position sensor (APPS)
		.16.11.00 Camshaft Position Sensor
		
		
		
		
		
		.16.12.00 Boost Pressure Control Valve
		
		.16.13.00 Engine Start Delay Relay (SULEV)
		
		.16.14.00  Exhaust Temperature Sensor (SULEV)
			.16.14.01 General Monitoring Description
			.16.14.02 Monitor function description
		
			
			.16.14.03 Chart(s) and Flow Chart (s)
		.16.15.00  reserved
		.16.16.00  reserved
		.16.17.00  reserved
		.16.18.00  reserved
		.16.19.00  reserved
		
		
		.16.20.00 Automatic Transmission Monitor
		.16.21.00 Output Stage Check
	.17.00.00  Other Emission Control or Source System Monitoring
	.17.01.00  Intake manifold runner flap monitoring
	
		.17.01.01 General Description
			.17.01.02 Monitoring function description
			.17.01.03 Charts and flow charts
			
	.18.00.00 Exemptions  to   Monitor Requirements
	.19.00.00 reserved
	.20.00.00 Parameters and conditions for closed loop operation
	
	
	.21.00.00 Parameters / conditions for 2nd closed loop  operation
	
	.22.00.00 Parameters / conditions for closed loop operation on SULEV
                        
Document Text Contents
Page 1

Bosch Motronic ME9 OBD System Strategy

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TABLE OF CONTENETS
.01.00.00 CATALYST MONITORING ........................................................................................................................4

.01.01.00 PASSIVE MEASUREMENT OF AMPLITUDE RATIO .............................................................................................4
.01.01.01 General description..................................................................................................................................4
.01.01.02 Monitoring Structure................................................................................................................................5
.01.01.03 Flow Chart Catalyst Monitoring.............................................................................................................5

.01.02.00 ACTIVE MEASUREMENT OF OSC ...................................................................................................................6
.01.02.01 General description..................................................................................................................................6
.01.02.02 Monitoring Structure................................................................................................................................7
.01.02.03 Flow Chart Catalyst Monitoring...........................................................................................................10

.02.00.00 HEATED CATALYST MONITORING ....................................................................................................11

.03.00.00 MISFIRE MONITORING...........................................................................................................................11
.03.00.01 General Description...............................................................................................................................11
.03.01.02 Monitoring function description ............................................................................................................12
.03.00.03 Chart(s) and Flow Chart(s) ...................................................................................................................15

.04.00.00 EVAPORATIVE SYSTEM DIAGNOSIS ..................................................................................................17
.04.01.00 LEAKAGE CHECK ........................................................................................................................................17

.04.01.01 General description................................................................................................................................17

.04.01.02 Monitoring function description ............................................................................................................18

.04.01.03 Chart(s) and flow chart(s)......................................................................................................................19
.04.02.00 PURGE CHECK.............................................................................................................................................21

.04.02.01 General description................................................................................................................................21

.04.02,02 Monitoring function description ............................................................................................................22

.04.02.03 Chart(s) and flow chart(s)......................................................................................................................22
.05.00.00 SECONDARY AIR SYSTEM MONITORING.........................................................................................23

.06.00.00 FUEL SYSTEM MONITORING................................................................................................................23
.06.01.00 General Description...............................................................................................................................23
.06.00.02 Monitoring function description ............................................................................................................23
.06.00.03 Chart(s) and flow chart(s)......................................................................................................................24


.06.04.00 FUEL PRESSURE MONITORING ...........................................................................................................27

.06.05.00 General Description...............................................................................................................................27

.06.05.00 Monitoring function description ............................................................................................................28
.07.00.00 OXYGEN SENSOR MONITORING .......................................................................................................30

.07.01.00 CALIBRATIONS WITH ASIC CJ 110 ............................................................................................................30
.07.01.01 General Description...............................................................................................................................30
.07.01.02 Monitoring function description ............................................................................................................30
.07.01.03 Chart(s) and flow chart(s)......................................................................................................................32

.07.02.00 OXYGEN SENSOR HEATER MONITORING.....................................................................................................37
.07.03.01 General description (ASIC CJ 110) .......................................................................................................37
.07.02.02 Monitor function description .................................................................................................................37
07.02.03 Chart(s) and Flow Chart(s) ...................................................................................................................38
.07.03.01 General Description...............................................................................................................................40
.07.03.02 Monitor function description .................................................................................................................40
.07.03.03 Chart(s) and Flow Chart(s) ...................................................................................................................42

.07.04.00 OXYGEN SENSOR HEATER MONITORING (ASIC CJ 125/120) .....................................................................44
.07.04.01 General description................................................................................................................................44
.07.04.02 Monitor function description .................................................................................................................44
.07.04.03 Chart(s) and Flow Chart(s) ...................................................................................................................45

.07.05.00 SULEV APPLICATIONS ...............................................................................................................................46
.07.05.01 General description................................................................................................................................46
.07.05.02 Monitor function description .................................................................................................................46

.07.05.03 Chart(s) and flow chart(s)......................................................................................................................48

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Bosch Motronic ME9 OBD System Strategy

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.07.06.00 OXYGEN SENSOR HEATER MONITORING (SULEV)....................................................................................53
.07.06.01 General description................................................................................................................................53
.07.06.02 Monitor function description) ................................................................................................................53
.07.06.03 Chart(s) and Flow Chart(s) ...................................................................................................................55

.08.00.00 EGR MONITORING ...................................................................................................................................57

.09.00.00 PCV MONITORING....................................................................................................................................57

.10.00.00 ENGINE COOLANT SYSTEM MONITORING......................................................................................58
.10.01.00 General description................................................................................................................................58
.10.01.02 Monitor Functional Description ............................................................................................................59
.10.03.00 Charts and Flow Charts.........................................................................................................................60

.11.00.00 COLD START EMISSION REDUCTION STRATEGY MONITORING............................................71
.11.01.00 General Description...............................................................................................................................71
.11.02.00 Monitoring function description ............................................................................................................72
.11.03.00 Charts and flow charts...........................................................................................................................73

.12.00.00 AIR CONDITIONING (A/C) SYSTEM COMPONENT MONITORING .............................................74

.13.00.00 VARIABLE VALVE TIMING AND/OR CONTROL (VVT) SYSTEM MONITORING ....................74
.13.01.00 General Description...............................................................................................................................74
.13.02.00 Monitor function description .................................................................................................................74
.13.03.00 Charts and flow charts...........................................................................................................................75

.14.00.00 DIRECT OZON REDUCTION (DOR) SYSTEM MONITORING ........................................................76

.15.00.00 PARTICULATE MATER (PM) TRAP MONITORING .........................................................................76

.16.00.00 COMPREHENSIVE COMPONENTS MONITORING..........................................................................76
.16.01.00 INJECTION VALVE .......................................................................................................................................76
.16.02.00 FUEL PUMP RELAY .....................................................................................................................................76
.16.03.00 IDLE CONTROLLER ......................................................................................................................................77
.16.04.00 ENGINE SPEED SENSOR: ..............................................................................................................................78
.16.05.00 WARM-UP BYPASS VALVE:..........................................................................................................................79
.16.06.00 SIGNAL RANGE CHECK FOR DIFFERENT SENSOR .........................................................................................79
.16.07.00 RATIONALITY MASS AIR FLOW SENSOR (MAF) ........................................................................................80
.16.08.00 VEHICLE SPEED SENSOR (VSS)...................................................................................................................82
.16.09.00 THROTTLE POSITION SENSOR (THROTTLE UNIT WITH E-GAS ACTUATOR) ...................................................83
.16.10.00 ACCELERATOR PEDAL POSITION SENSOR (APPS) ........................................................................................84
.16.11.00 CAMSHAFT POSITION SENSOR .....................................................................................................................85
.16.12.00 BOOST PRESSURE CONTROL VALVE............................................................................................................86
.16.13.00 ENGINE START DELAY RELAY (SULEV) ....................................................................................................87
.16.14.00 EXHAUST TEMPERATURE SENSOR (SULEV)...............................................................................................88

.16.14.01 General Monitoring Description ...........................................................................................................88

.16.14.02 Monitor function description .................................................................................................................88

.16.14.03 Chart(s) and Flow Chart (s) ..................................................................................................................89
.16.15.00 RESERVED ...................................................................................................................................................90
.16.16.00 RESERVED ...................................................................................................................................................90
.16.17.00 RESERVED ...................................................................................................................................................90
.16.18.00 RESERVED ...................................................................................................................................................90
.16.19.00 RESERVED ...................................................................................................................................................90
.16.20.00 AUTOMATIC TRANSMISSION MONITOR .......................................................................................................91
.16.21.00 OUTPUT STAGE CHECK ...............................................................................................................................91

.17.00.00 OTHER EMISSION CONTROL OR SOURCE SYSTEM MONITORING ...........................................92

Page 52

Bosch Motronic ME9 OBD System Strategy

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Oxygen Sensors Monitor Heater Coupling (LSF1 / LSF2)





Start of Monitoring Procedure

End of Monitoring Procedure

Heater off
(Voltage Drop)?

increment counter 1

Slope of
Sensor Signal
> Threshold?

increment counter 2

Counter 1 > Threshold 1?
Counter 2 < Threshold 2?

Sensor okay

Fault Management

Diagnostic for Heater Coupling
(Sensors downstream Catalysts)

no

yes

yes

no

yes

no

Page 53

Bosch Motronic ME9 OBD System Strategy

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.07.06.00 Oxygen Sensor Heater Monitoring (SULEV)

.07.06.01 General description



For proper function of the Oxygen sensors, their ceramic elements must be
heated. A non-functioning heater delays or prevents either the sensor
readiness (LSU) or the proper signal output (LSF1/LSF2) for closed loop
control and thus influences emissions.

Oxygen sensor upstream catalyst (LSU)

The heater control loop is integrated within the oxygen sensor hardware
and has to achieve a target temperature of about 750 °C of the ceramic
element.

Oxygen sensors downstream catalysts (LSF1 and LSF2)

For diagnostic of the sensor heater a specific current pulse is supplied via a load
resistance and the voltage is measured. The intern resistance of the sensor heater
is calculated with the voltage deviation. The result will be compared with a reference
map resistance, which considers aging and sampling deviations. In case of internal
resistance > map resistance the diagnosis stores a fault and the MIL will be
illuminated.


.07.06.02 Monitor function description)


Monitoring Structure (Oxygen sensor upstream catalyst)




Heater Monitoring of Linear Oxygen Sensor Upstream Catalyst

delay>threshold

NOT

&

Logic

time delay after
heater on

sensor ready

Operating readiness

Power stage (final stage)

input power stage

output power stage

short cut to UB

short cut to ground

broken wire

Sensor
heater defective

Logic

heater input current Heter power permant low

Heater Control Loop

internal resistance Heter power permant high



Characteristics: - Switch on of sensor heater is ECM controlled

Page 103

Bosch Motronic ME9 OBD System Strategy

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Conditions for closed loop operation of the third control loop

The third control loop is designed like the second control loop on
conventional concepts and achieves the maximum conversion of the 2nd
brick of the catalyst. The controller consists of very restricted correction
ranges for the short-term proportional and the long-term integral adaptive
portion (PI-controller). Both controller ranges have individual conditions for
closed loop operation.

Enable criteria for P-portion of the controller of third control loop
(SULEV)

The proportional-portion of the controller corrects short term deviations.


Parameter / System Condition/Evaluation Monitor
Closed loop condition for the
first control loop. Minimum
of integrated mass air flow
passed.

No fault detected in wiring of
the sensor or the sensor IC
(linear sensors). Fuel control
performs normal, no fault is
detected and fuel control is
not temporarily disabled.

Oxygen sensor monitor for
the front sensor(s). Monitor of
the mass air flow meter (out
of range, rationality).
Fuel system monitor

Closed loop condition for the
second control loop.
Minimum of integrated mass
air flow passed.

No fault detected in LSU
System (Sensor, wiring, IC)
and no fault at LSF1 and
LSF2. Fuel control performs
normal, no fault is detected
and fuel control is not
temporarily disabled.

Oxygen sensor monitor for
the front sensor(s). Oxygen
sensor monitor for the first
downstream sensor(s) and
Oxygen sensor monitor for
the second downstream
sensor(s). Monitor of the
mass air flow meter (out of
range, rationality).
Fuel system monitor

Oxygen Sensor for 3rd control
loop readiness

Sensor heated up, a
minimum power was
delivered to the heater,
sensor voltage has left the
voltage range of a cold
sensor

Monitored by diagnostic of
the heater monitor and
sensor wiring monitor.

Catalyst model temperature Exhaust Temperature >
threshold (above light-off
temperature), calculated
based on mass air flow
integral, ignition timing,
lambda value, vehicle speed.

Monitor of the mass air flow
meter (out of range,
rationality) Fuel system
monitor, oxygen sensor
monitor, vehicle speed sensor
monitor

Variable Valve Timing
System (if applicable)

No fault detected VVT monitor

Secondary Air System No fault detected AIR System monitor
EVAP purge System No fault detected EVAP purge monitor
Mass Air Flow Meter No fault detected Mass Air Flow Meter monitor
Controller range for the first
control loop

Controller for the first control
loop not at minimum or
maximum threshold

Oxygen sensor monitor

(LSU: Linear Oxygen Sensor, LSF1: 1st Binary Oxygen Sensor, LSF2: 2nd Binary Oxygen Sensor)

Page 104

Bosch Motronic ME9 OBD System Strategy

- 104 -



Enable criteria for adaptive I-portion of the controller third control
loop (additionally)

The integral-portion of the controller corrects permanent deviations / shifts
over a longer time by adjusting the adaptation.


Parameter / System Condition/Evaluation Monitor
Engine speed/load within a
normal operating range

Engine Speed within 2700-
3500 rpm
Engine Load within 25-45%

(Typical values; may differ on
individual concepts)

Engine Speed Sensor
monitor, Mass Air Flow Meter
monitor, fuel system monitor.

Carbon Canister of the EVAP
system

High load of carbon canister
indicated during EVAP purge.

EVAP purge monitor.

Minimum of integrated mass
air flow passed and P-portion
of controller achieves target
range for Oxygen sensor
voltage already.

Oxygen sensor voltage of 2nd
control loop, P-portion of
controller for 2nd control loop

Oxygen sensor monitor for
secondary sensor(s).
Fuel system monitor


Typical Values (third control loop)


Given a normal cold started FTP (around 20°C) most of the concepts reaches the closed
loop condition for the third control loop within 90s to 100s.

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