1. OnGuard introduced February 2008, first Collision Safety System with active braking.

2. Complete Brake System Integration
Pyramid of Safety
Building Blocks
Complete Brake System Integration 2 2

3. Safety Systems On-Board Vehicles ABS, ATC, RSC, RSS, OnGuard

4. Anti-Lock Braking System (ABS) Automatic Traction Control (ATC)
and
Automatic Traction Control (ATC) .
Introduction slide for stability control systems (RSC/ESC) one of which is required for On Guard.
Stability control systems utilize active braking function which is also required for OnGuard.
Option 1: ABS + ATC + RSC required for OnGuard.
Option 2: ABS + ATC + ESC required for OnGuard. 4

5. ABS / ECU With RSC Accelerometer
Cab
Frame

6. Roll Stability Control
COLOR KEY
Primary
Secondary
Park & Emergency
Blended Air
Supply
Electrical Wire
Note the basics of ABS and point out the build up of ABS to ATC to RSC.
Show how only a few components are added and the system stays the same.
Emphasize that the simplicity of RSC provides high value function at reduced cost compared to ESC.
Greater serviceability due to the reduced number of components and no requirement for parameter settings. 6

7. Roll Stability Control (RSC) Platform
RSC functionality integrated in power unit ABS / ATC ECU
Accelerometer mounted directly to ECU Printed Circuit Board
When roll thresholds are exceeded:
SAE J1939 datalink used to de-throttle engine & apply engine brake / retarder
Solenoid valves can actuate steer, drive & trailer axle brakes
SAE J1587 and J1939 DataLink for driver communication & diagnostics
Stability / ATC indicator lamp

8. Functional Elements of RSC
Measurement & processing of lateral acceleration
Calculation of critical acceleration limit
Rollover risk detection
RSC intervention
Flat
Engine control
Retarder control
Brake control
Flat
COG G G
hcog R S

9. RSC Intervention Closed loop control
Type and magnitude of intervention determined by relationship of measured relevant lateral acceleration to control critical acceleration limit
ATC/RSC light on in dash during event
Intervention always includes engine torque reduction, followed by application of
Engine brake (if equipped)
Drive axle and trailer brakes

10. Warning Light on Dash

11. RSC Indicator Lamp-ATC Lamp

12. Roll Stability Intervention (Stage One-Throttle)

13. Roll Stability Intervention (Stage 2 Engine Brake)

14. Roll Stability Intervention (Stage 3, Apply Brakes

15. OnGuard Collision Safety System
Uses forward-looking 77 Ghz radar sensor technology to monitor distance to target vehicle
Integrates collision safety system control with ABS and stability control. 15

16. OnGuard™ Display Screen background color
Blue: standby mode no target vehicle detected
Green: target vehicle detected
Yellow: following distance alert
Red: collision warning

17. OnGuard™ Radar Sensor Radar - 77 ghz
Radar sensor transmitter broadcast high frequency radio signals
Radio signals bounce off objects and return to receiver
Determines speed and distance of target
Radar broadcasts 3 beams and listens to echo.
Radar can track up to 20 objects and classifies if stationary.

18. Fascia
Connector Down
Connector Up

19. Cruise Control NOT Set: CMS is always activated at speeds above 15 mph and will apply brakes and engine retarder control, as well as audible and visual alerts if the situation requires it.
System on and Cruise Control not set. No lead vehicle detected.
System on and Cruise Control not set. Lead vehicle detected.
Following Distance Alert Lead vehicle is within safe following range. 19

20. Cruise Control Set: You activate the cruise control speed using factory cruise controls. When a vehicle is detected in front of you the system controls your speed to maintain a set distance between you and the detected vehicle. The CWS is on and will emit visual and audible collision warnings and if there is a collision event will APPLY BRAKING, ENGINE OR RETARDER CONTROL if needed.
System on and Cruise Control set. No lead vehicle detected.
System on and Cruise Control set. Lead vehicle detected. You may sense a decrease in power or vehicle speed in order to maintain a set distance between you and the detected vehicle.
The braking, engine and retarder control may
activate, and reduce the
vehicle speed.
The driver should also
initiate braking if needed. 20

21. Diagnostics
Fault Codes, OnGuard Disabled 21

22. Adaptive Cruise Control (ACC)
NO VEHICLE AHEAD
VEHICLE DETECTED AHEAD
55 MPH
55 MPH
55 MPH
Set Following Distance
65 MPH to 55 MPH
55 MPH
65 MPH
Driving at a Set Speed Vehicles Not in Lane Rejected
Speed Reduced From 65 MPH to 55 MPH
Minimum Set Following Distance Maintained
1. Constant Speed Driving
2. Deceleration Control
3. Tracking Control
Meritor WABCO Proprietary Information 22

23. 45 MPH 65 MPH to 45 MPH 55 MPH to 65 MPH 55 MPH to 45 MPH
VEHICLE CHANGES LANES
55 MPH
55 MPH
New Lead Vehicle detected, significantly inside set following distance
45 MPH
65 MPH to 45 MPH
Vehicle ahead out of lane & disregarded, no lead vehicle assigned
45 MPH to 65 MPH
55 MPH to 65 MPH
VEHICLE CUTS IN AND SLOWS
55 MPH to
45 MPH
Speed Increased from 55 MPH Back to 65 MPH
Speed Reduced From 55 MPH to 45 MPH Using Throttle, Engine Brake and Tractor Foundation Brakes
Driver Changes Lanes & Uses Turn Signal – Speed Increased to 65 MPH
4. Acceleration Control
5. Deceleration Control
6. Changing Lanes
Meritor WABCO Proprietary Information 23

24. Driver Actuates Brake Pedal to Disengage
Non-Lead Vehicle
Lead Vehicle
65 MPH to 55 MPH
ACC Yaw Rate Sensor Senses Excessive Lateral “G” Forces and Throttles Engine Down
ACC Yaw Rate Sensor adjusts detection zone for turn
65 MPH to 50 MPH
65 MPH to 50 MPH
Driver Actuates Brake Pedal to Disengage
7. Roll Control
8. Bend Adjustment
9. Disengagement
Meritor WABCO Proprietary Information 24

25. Diagnostics Performed via the OnGuard display. (Active Faults Only).
TOOLBOX Software 10.0 capable of diagnosing radar sensor faults and other data.

26. Diagnostics: Fault Codes, OnGuard disabled

27. Toolbox Software Diagnostics

28. Toolbox Software Diagnostics

29. Toolbox Software Diagnostics

30. Toolbox Software Diagnostics

31. Diagnostic Fault Codes USO 2.XXXX
SPN/FMI
Displayed Description
Repair Instructions
86110 / 12
Radar Init Error
Verify no foreign objects on radar.
86416 / 13
Yaw Offset or H Align Error
Check radar mounting and alignment.
86516 / 14
Radar Blocked or Align
Verify no foreign objects on radar. Check mounting & align.
86517 / 14
86566 / 12
Engine Ignores ACC Control
Usually a secondary fault.

32. Radar Inspection Inspect the bumper, and fascia for any damage.
Verify there is at least ¼” of clearance between the fascia and bumper.
Remove fascia (either 7/16” bolts, or T-30), verify there is at least ¼” of clearance between the radar and the bumper.
Verify connector is fully plugged in, and there is no damage to it, or the rubber boot.
Inspect all three screws and clips, make sure not broken and screws are fully engaged.
Hold both sides of radar and wiggle (should not be any play).

33. Radar Inspection

34. Radar Removal Remove fascia (either 7/16” bolts, or T-30).
Press on the locking tabs, and remove the electrical connector.
Use a T-20 torx bit and ratchet and carefully remove all three radar screws.
Once radar is removed, inspect all three screws and clips. Inspect the three through hole adjusters. Make sure they are tight and not damaged.
Inspect the radar harness and radar connector for damage and corrosion.
Note: if there is any damage, or corrosion will have to be replaced.

35. Radar Installation
Line up all three screws with the through hole adjusters and hold the radar in place.
Use a T-20 torx bit and ratchet and carefully install all three radar screws. Install so that about half of the threads are fully installed in the through hole adjusters.
Plug in the electrical connector and make sure the rubber boot is fully covering the connector.
Transition…..Once the radar has been initially installed, it will have to be properly aligned. The alignment process consists of two steps, vertical and horizontal. Let’s take a look at the vertical alignment process first.

36. Radar Alignment Procedure
Connector Up
Connector Down
VERTICALSCREW
HORIZONTAL SCREW
VERTICALSCREW

37. Radar Vertical Alignment
Take a digital level and place it on the shop floor directly in front of the truck and underneath the radar. Make sure the suspension is at normal ride height.
Zero the level.
Use the T-20 torx bit; adjust the vertical alignment screw accordingly to achieve a reading of 90 degrees. Radar needs to be perpendicular to the floor.
Transition……Once the vertical alignment has been set, the next step will be to road test the truck and perform the horizontal alignment.

38. Radar Horizontal Alignment
Have to drive the truck in order to perform.
Start up the truck and press the mode button on the display twice to get to the radar alignment screen.
Drive on a straight, flat road and track a vehicle.
Screen will be blue when not tracking a vehicle; will turn green when tracking a vehicle and show distance.
Start tracking a vehicle and monitor the bar graph on the display.
Will start to settle in, but will not sit in one spot. Let lead vehicle increase distance to around 250 ft.

39. Radar Horizontal Alignment
Stop the truck and make the appropriate adjustment to the horizontal alignment screw with T-20 torx.
Drive truck again after making the adjustment and track a vehicle again to verify proper alignment. Should be able to track 350 – 400 ft
Return to the shop and re-install the fascia. Make sure the OnGuard logo is in the proper orientation.

40. Checking Radar Horizontal Alignment
SLIDING BAR

41. Radar Alignment Screen

42. Parts.. Check Part Number on Tag

44. Explanation of Radar Data Example
The Haptic Warning occurred with a lead vehicle decelerating at about 0.1 g (fairly typical of a car approaching a stop sign or red traffic light) and was slowed to 16 mph when the Haptic Warning activated.  The vehicle with the radar was still travelling 54 mph, decelerating at only 0.02 g (maybe off-accelerator for a loaded truck, accelerator lifting but not at zero position for an empty or bobtail truck); the driver’s brake pedal was released.  The lead vehicle was 190 feet away when the Haptic Warning became active, but if both vehicles continued at constant deceleration in a straight line, collision would have occurred within 3.2 seconds.  The radar had been locked onto the lead vehicle for over 4 seconds, so there is high confidence in the accuracy of the target.

45. Literature: www.meritorwabco.com
SP-0818 – OnGuard Driver Tips.
TP – OnGuard Display Operating Instructions.
MM-0951 – OnGuard Maintenance Manual.
SP-0853 – OnGuard Information.

46. Driver Tips Video