OnGuardACTIVE™ Collision Mitigation System

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WABCO OnGuardACTIVE CMS is a forward-looking radar-based safety system. The system includes forward collision warning, adaptive cruise control (ACC), and collision mitigation.

OnGuard equipped vehicles have antilock brakes (ABS) and automatic traction control (ATC), and either roll stability control (RSC) or electronic stability control (ESC). These systems work together to enhance control of the vehicle. Depending on the situation, any of these features may apply throttle control, engine brakes, and/or service brakes, as needed.

The front-looking antenna assembly transmits radar signals to, and receives them back from, objects ahead of the vehicle. To be detected, vehicles must be within the radar field of view and provide a surface area that can reflect the radar. The distance, speed, and angle of the vehicle ahead is calculated, and the driver is warned of potentially dangerous situations. The system also warns of stationary objects to alert the driver of potential obstructions ahead in their lane.

Warning: The WABCO OnGuardACTIVE™ Collision Mitigation System is intended solely as an aid for an alert and conscientious professional driver. It is not intended to be relied upon to operate a vehicle. Use the system in conjunction with rearview mirrors and other instruments to safely operate the vehicle. Operate a vehicle equipped with OnGuardACTIVE in the same safe manner as if the CMS were not present.

The OnGuardACTIVE Collision Safety System is not a substitute for safe, normal driving procedures, nor will it compensate for any driver impairment such as drugs, alcohol, or fatigue.

Failure to drive safely and use the system properly could result in personal injury and/or death and severe property damage.

System Limitations

The OnGuardACTIVE CMS may provide little or no warning of hazards such as pedestrians, animals, oncoming vehicles, or cross traffic.

The OnGuardACTIVE CMS only brakes for lead vehicles located directly in front of your vehicle, and does not operate when vehicle speed is less than 15 mph (25 km/h).

Due to these limitations, the system:

  • will not react and alert the operator to objects crossing in front of the vehicle or oncoming traffic;

  • should not be relied on to track lead vehicles when traveling through a severe curve in the road. Because of this, ACC is not recommended for use on winding roads;

  • should not be relied upon to track narrow objects like motorcycles, mopeds, bicycles, or pedestrians;

  • should not be relied on to alert drivers to vehicles in an adjacent lane.

OnGuard Radar Sensor

The OnGuardACTIVE radar sensor is used to detect vehicles and obstacles for the OnGuardACTIVE CMS. It is mounted in the front of the vehicle near the center of the bumper and recessed in the bumper in most applications. See Fig..

Fig. 1, OnGuard Radar Location

Important: Do not mount any attachments in front of the radar distance sensor. Do not paint or affix items over the distance sensor cover. If attachments are mounted in front of the distance sensor, such as a crash guard, they can impair the operation of the distance sensor.

OnGuard Display Unit

The OnGuardACTIVE CMS controls are located in the display unit. The display provides visual and audible warnings and messages, as well as verification of correct system operation and faults. Menu selections are made by pressing the up and down arrows, and the MODE button. See Fig..

  1. Mode

  2. Day/Night Mode

  3. Up

  4. Down

Fig. 2, OnGuard Display Unit

The display unit includes:

  • an internal speaker

  • a graphic display

  • buttons to scroll and select options

  • day/night display mode (second-generation only)

Collision Warning System (CWS)

The CWS generates audible, visual, and vibrational alerts when the following distance may result in a collision. The OnGuard display unit shows a graphic of the condition, enhanced by a screen color relevant to the intensity of the situation. See Table..

Table 1, OnGuard Display Screen Background Colors

OnGuard Display Screen Background Colors

Screen Color

Description

Blue

General operation; no lead vehicles detected.

Green

Lead vehicle detected.

Yellow

Following distance alert, accompanied by an audible alert.

Red

Collision warning, stationary object warning. Accompanied with audible alert.

Amber

Data Error

    Table 1, OnGuard Display Screen Background Colors

    If a potential collision is developing and the driver does not take action to slow the vehicle, OnGuardACTIVE’s active braking feature issues a short brake pulse and de-throttles the engine.

    If the driver does not take the appropriate action and a potential collision still exists, OnGuardACTIVE reduces the engine torque and applies the engine and service brakes to slow the vehicle.

    The active braking application is intended only to provide early braking; the driver is still required to recognize and react to all driving situations.

    If OnGuardACTIVE detects a stationary object (such as a disabled car), it will provide an audible alert followed by a vibrational alert and then brake to reduce the vehicle’s speed.

    Again, the active braking application is intended only to provide early braking; the driver is still required to recognize and react to all driving situations.

    Important: CMS and active braking are not operational at vehicle speeds below 15 mph (25 km/h).

    The CWS cannot be disengaged or turned off, and is always active at vehicle speeds above 15 mph (25 km/h).

    Standby

    When no lead vehicle is detected, the display shows that the CMS is on and the radar is searching. See Fig..

    Fig. 3, CMS Standby (blue)

    A Vehicle is Detected

    When a lead vehicle is detected in the lane ahead, the display shows that the CMS is on and the radar is tracking a lead vehicle at the speed shown. See Fig..

    Fig. 4, CMS Lead Vehicle Detected (green)

    If the following distance between the vehicle and the lead vehicle is too close, the CMS will emit an audible alert and the display background will turn yellow. The alert will end when the vehicle speed drops below the lead vehicle speed and the following distance is increased.

    Collision Warning

    When a lead vehicle is detected traveling slower than your vehicle, or the gap between them becomes too close, the CMS warns of an impending collision by emitting an urgent audible alert and displaying the collision warning symbol with a red background. See Fig..

    Fig. 5, CMS Collision Warning (red)

    Adaptive Cruise Control (ACC)

    Adaptive cruise control (ACC) works in conjunction with conventional cruise control to maintain a minimum following distance when a lead vehicle is being tracked. The minimum following distance is maintained by automatically decelerating the vehicle using accelerator pedal, engine, and service brakes without driver intervention.

    When the lead vehicle is no longer being tracked, the set cruise control speed resumes automatically.

    Vehicles equipped with the WABCO OnGuard CMS and Cummins engines come standard with ACC and adaptive cruise control recovery enabled.

    If ACC is not available, the cancel button must be used to engage standard cruise control.

    To obtain cruise control when the adaptive cruise control function has been interrupted, press the pause button 2 times (ON-OFF-ON-OFF) and then press the set button once.

    A Set or Resume command on the Set, Resume buttons will now engage the standard cruise control features.

    Standby

    When no lead vehicle is detected, OnGuard ACC operates similarly to conventional cruise control. The cruise control set speed is shown on the OnGuard display unit. See Fig..

    Fig. 6,  ACC Standby (blue)

    Lead Vehicle Detected

    When a lead vehicle is detected in the lane ahead, the display shows that ACC is on and the radar is tracking it. See Fig..

    Fig. 7,  ACC Lead Vehicle Detected (green)

    If the driver uses the accelerator pedal to override the cruise control and approach a vehicle too closely, the ACC will emit an audible alert and the display background will turn yellow. The alert will end when vehicle speed drops below the lead vehicle’s speed and the following distance is increased.

    Note: The following distance alert does not operate at speeds below 15 mph (25 km/h) or above 77 mph (124 km/h).

    Collision Warning

    If the lead vehicle is traveling slower than the driver’s vehicle, the CMS warns of an impending collision by emitting an urgent audible alert and displaying the collision warning symbol with a red background. See Fig..

    Fig. 8, ACC Collision Warning (red)

    If the system determines a rear end collision is imminent, it will automatically apply the brakes to reduce the vehicle’s speed. The driver may also feel a short brake pulse to warn of an imminent collision. The driver must also initiate braking.

    If OnGuardACTIVE detects a stationary object (such as a disabled car), it will sound an urgent audible alert, then a brake pulse, then apply the vehicle’s brakes to reduce the vehicle’s speed. The driver must also initiate braking.

    Error Screens

    Important: The OnGuard collision mitigation system is not operational when an error screen is displayed. If a fault occurs or OnGuard fails to properly track a vehicle, take the vehicle in for service as soon as possible. Standard cruise control will not function with an active OnGuard system fault.

    If a system fault is detected, the OnGuard display unit will immediately display an error screen as shown in Fig. The first error code transmitted will be displayed first; additional faults (if any) can be viewed using the up or down buttons. The display does not show stored fault codes.

    See OnGuard™ and OnGuardActive™ Collision Mitigation Systems Maintenance Manual for a full list of error screens and messages www.meritorwabco.com .

    Fig. 9,  OnGuard Error Screen (amber)

    Additional Features

    Press the MODE button to access the OnGuard display unit additional features from the CMS or ACC main operating screen. Press the up and down arrows to scroll through each menu, then press the MODE button to select the value to be changed. In edit mode, press the up or down arrows to change a value setting, then press the MODE button to save the setting. Pressing MODE in each feature screen advances the display to the next feature.

    The Display Control menu allows adjustment of the alarm volume, LCD brightness, LCD contrast, and U.S./metric unit conversion. See Fig..

    Fig. 10, Display Control Menu

    The component test menu provides verification of system component operation and acts as a valuable OnGuard system diagnostic tool. The header will display either COMPONENT TEST or ACC FUNCTION, depending on the software release version of the OnGuard system. The component test screen shown in  f611151 provides access to the following components (press the up or down arrows to scroll through the menu):

    • brake pedal position

    • EBS brake switch

    • CCVS brake switch

    • clutch switch

    • park brake switch

      Fig. 11, Component Test Menu

    • accelerator pedal position

    • driveline engaged

    • cruise control enable

    • cruise control set speed switch

    • cruise control coast switch

    • cruise control resume switch

    • cruise control accelerate switch

    • cruise control pause switch

    Note:
    Parent topic: Ametek Instrument Panel
    Document Number: 0000106942
    Manual Publication Date: 2024-05-07
    Topic Publication Date: 2024-05-06