Lincoln Aviator 2020-2022 Service Manual / Electrical / Electronic Feature Group / Cruise Control / Description and Operation - Cruise Control - System Operation and Component Description

Lincoln Aviator: Cruise Control / Description and Operation - Cruise Control - System Operation and Component Description

System Operation

Adaptive Cruise Control


Item Description
1 IPC
2 Accelerator Pedal
3 Deactivator Switch
4 Stoplamp Switch
5 Brake Switch Assembly
6 SCCM
7 PCM
8 Cruise Control Switches
9 IPMA
10 BCM
11 ABS Module
12 GWM
13 RCM
14 CCM
15 SIMA

Network Message Chart

  Network Input Messages - ABS Module


Broadcast Message Originating Module Message Purpose
ACC deceleration request   IPMA Used for cruise control automatic braking.
ACC stop mode request   PCM Used for ACC automatic braking.
Brake pedal applied   PCM Used for brake switch input.
Cruise control overide   PCM Driver overriding cruise control with accelerator pedal.

  Network Input Messages - CCM


Broadcast Message Originating Module Message Purpose
  APP   PCM Used for accelerator pedal status.
ACC enabled   IPC Activates ACC
ACC stop mode request   PCM Used for ACC automatic braking.
ACC switch comands   SCCM Used for speed control enable/disable, gap settings and operating mode request.
Brake pedal applied   PCM Used for brake switch input.
Cruise control override   PCM Driver overriding cruise control with accelerator pedal.
Ignition status   BCM Used for ignition switch position input.
Stability control event in progress ABS module Deactivates cruise control when requested.
Traction control event in progress
Vehicle yaw rate
Vehicle lateral acceleration   RCM Deactivates cruise control when requested.
Vehicle longitudinal acceleration
Vehicle configuration data   BCM Used for comparison checking ACC configuration.

  Network Input Messages - IPC


Broadcast Message Originating Module Message Purpose
ACC gap distance display   IPMA Data used to generate message center display indicating adaptive cruise control gap setting.
ACC follow mode display   IPMA Data used to activate the follow vehicle indicator.
ACC stop mode display   IPMA Data used to activate the stop and go auto mode indicator.
ACC resume display   IPMA Data used to activate the stop and go auto resume mode indicator.
Cruise control set speed display   PCM Data used to activate the select cruise control display.
Cruise control override   PCM Driver overriding cruise control with accelerator pedal.
Cruise control status   PCM Data used for cruise control indicator status.

  Network Input Messages - PCM


Broadcast Message Originating Module Message Purpose
Steering wheel switch speed control request   SIMA Used for cruise control enable/disable and operating mode request.
Stability control event in progress ABS module Deactivates cruise control when requested.
Traction control event in progress
Vehicle lateral acceleration   RCM Deactivates cruise control when requested.
Vehicle longitudinal acceleration
Vehicle yaw rate

ACC Operation

NOTE: For a complete illustration of the ACC indicators and graphic displays, refer to the Owner's Manual.

The ACC system functions much like a standard cruise control system. The ACC system automatically adjusts the vehicle speed to maintain a set distance gap from the front of the vehicle and the vehicle in the same path of travel. When the ACC system is on and is following a vehicle or a vehicle enters the same driving lane, a follow vehicle graphic is displayed in the message center.

The ACC system does not function if the vehicle speed is below 20 km/h (12 mph). As the vehicle slows down during automatic braking, the ACC system discontinues braking at 20 km/h (12 mph). At speeds under 20 km/h (12 mph), an audible alarm sounds and the automatic braking from the ABS module is released. The driver must take over the vehicle braking control.

The cruise control deactivator switch (which is integral to the stoplamp switch) is an additional safety feature. When the brake pedal is applied, the cruise control system deactivator switch opens and removes the ground signal from the PCM input circuit, releasing the throttle and immediately deactivating the system.

The CCM monitors the yaw rate signal from the ABS module and compares it to the wheel speed and steering wheel angle signals. If the ABS module determines the yaw rate is invalid, the CCM disables the ACC. The message center displays the message COLLISION WARNING MALFUNCTION and/or ADAPTIVE CRUISE MALFUNCTION.

The CCM monitors the environment in front of the vehicle while active. If the radar beam is obstructed by a buildup of snow, ice, rain or other debris or the vehicle is driven in a desert environment with no other traffic for extended periods of time, the sensor triggers an "ADAPTIVE CRUISE NOT AVAILABLE SENSOR BLOCKED SEE MANUAL" message in the message center and disables the ACC. The ACC resumes once the obstruction is cleared and the radar is able to detect targets or upon a key cycle.

The ACC with stop and go technology allows the vehicle to follow a lead vehicle to a stop. An indicator in the message center indicates the vehicle is in the stopped mode. If the lead vehicle moves from a stop within 3 seconds, the vehicle automatically resumes to the set speed. If the lead vehicle remains stopped for more than 3 seconds, the system resumes when the RESUME switch on the steering wheel is pressed or the operator taps the accelerator pedal. An indicator in the message center indicates the vehicle is in the RESUME mode. The vehicle automatically accelerates to the set speed.

The ACC with lane keeping system uses radar and camera sensors to assist in keeping the vehicle within the lane by applying a continuous assistance steering torque input toward the lane center. When the system is active in the Alert mode and the vehicle unintentionally drifts out of its lane, the system provides an alert by vibrating the steering wheel. In Aid mode, the system provides steering assistance by counter steering the vehicle back into the lane. Refer to the Owner's Manual for additional information.

Intelligent ACC with traffic sign recognition has a number of speed warning levels that can be programmed. When this mode is selected, a bracket appears around the set speed and the detected speed limit sign in the information display. The system is designed to set the vehicle speed to the speed limit detected by the speed sign recognition system before the vehicle passes the speed limit sign. Refer to the Owner's Manual for additional information.

The ACC system does not engage properly and the message center displays FRONT SENSOR NOT ALIGNED if the front radar sensor is not aligned correctly. The ACC resumes once the radar is aligned and is able to properly detect targets.

The CCM radar vertical and horizontal alignment procedure is located in General Procedures. The horizontal alignment for the CCM is a calibration check performed by the scan tool to insure the CCM radar is pointed straight. The scan tool identifies this as, Alignment Offset with a horizontal specification of +/- 3.0 degrees offset. For additional information,
Refer to: Cruise Control Radar Alignment (419-03B Cruise Control, General Procedures).

The ABS module estimates brake temperature by monitoring applied brake pressure over a period of time and sends a message to the CCM when the estimated temperature is above a given threshold. An alarm sounds and the ACC system is deactivated until the estimated brake temperature returns to cooler operating conditions. This condition can happen in hilly or mountainous driving terrain.

Cruise Control Indicator

The ACC indicator located in the IPC illuminates a gray indicator lamp and displays the previous gap setting and SET graphic indicating the system is in standby mode. This notifies the driver the system is ready and the vehicle can be accelerated to the desired speed. A green ACC indicator illuminates when the system is active.

Steering Wheel Switch Function

The ACC steering wheel mounted switches are momentary contact switches that toggle up and down for the cruise control switch state. Pressing and releasing the steering wheel cruise control ON switch turns the cruise control system on and the cruise control icon illuminates in the message center. Pressing and releasing the steering wheel cruise control OFF switch turns the cruise control system off. Pressing SET+ switch sets the vehicle's speed and stores the set speed in memory. The ACC indicator illuminates and the message center displays the set speed and gap setting graphic.

There are two ways to change the set speed. The first way is to accelerate or brake to the desired speed and press and release the SET cruise control switch until the desired set speed is shown on the message center. The second way is by tapping the SET+ or the SET- switch while in the set mode, increasing or decreasing the displayed set speed by 1.6 km/h (1 mph) per tap. If the respective button is pressed and held, the displayed set speed continues to increase or decrease until the button is released. The ACC system may apply the brakes to slow the vehicle down to the new set speed. The set speed displays continuously in the message center while the ACC system is active.

Pressing and releasing the off switch or switching the ignition off, turns the ACC system off. The ACC set speed memory is erased.

Applying the brake or pressing the CANCEL switch puts the ACC system in standby mode and the last set speed is displayed in the message center with a strike through. Pressing the RESUME button when the ACC system is in standby mode causes the vehicle to accelerate to the last set speed. The set speed continuously displays in the message center while the ACC system is active. RESUME does not function if the off button is pressed, the ignition is cycled off or if the current vehicle speed is below the minimum operational speed.

The ACC system has the capability for the driver to change from ACC to standard cruise control. The respective 5-way steering wheel switch is used to switch from the ACC system to standard cruise control system within the message center. For additional information on selecting the standard cruise control in the message center, refer to the Owner's Manual. Once the driver has selected the standard cruise control in the message center, the ACC indicator is replaced by the standard cruise control indicator. The vehicle no longer responds to lead vehicles or automatic braking. Upon the next vehicle ignition cycle, the vehicle defaults back to the ACC system.

Gap Setting

When a vehicle ahead enters the same lane or a slower vehicle is ahead in the same lane, the vehicle speed adjusts automatically to maintain a preset distance gap. Four horizontal bars with four preset distance gap settings are displayed in the message center. Pressing up (decrease) or down (increase) on the steering wheel cruise control gap switch increases or decreases the distance from the vehicle ahead. If all of the bars are illuminated, this is the longest gap setting. If only one bar is illuminated, that is the shortest gap setting.

The vehicle maintains the distance gap to the vehicle ahead until:

  • the vehicle ahead accelerates to a speed above the set speed.
  • the vehicle ahead moves out of the lane or out of view.
  • the vehicle speed falls below 20 km/h (12 mph).
  • a new gap distance is set.

After each ignition cycle, the previous gap setting is remembered and the system is set to that gap setting.

The distance gap can be overridden by pressing the accelerator pedal. The follow vehicle graphic is not displayed in the message center and the green indicator illuminates. When the accelerator pedal is released, the ACC system returns to normal operation and the vehicle speed decreases to the set speed or a lower speed if following a vehicle ahead.

Deceleration Control

The CCM commands the ABS module, which controls the brakes, to automatically apply the brakes to slow the vehicle to maintain a safe distance to the vehicle in front.

Pre-Collision Assist System Operation

The pre-collision assist system is offered as a camera-only option without ACC. An additional safety feature on vehicles equipped with ACC uses both the CCM and the IPMA. The system is active whether the ACC system is on or off. If the system detects a vehicle, pedestrian or other object in the vehicle path of travel, the system provides three levels of functionality:

  • Visual and audible alert
  • Brake support
  • Active braking

Vehicles equipped with ACC use object detection information from the radar sensor integrated in the CCM and the forward-looking camera in the IPMA located on the front windshield below the rear view mirror. The CCM and the IPMA scan a designated area in front of the vehicle. Messages are sent between the CCM and the IPMA on a dedicated CAN circuit, which determines whether an object, vehicle or pedestrian is in the path of travel, the approximate distance to the object and how fast the vehicle is approaching it. For additional information,
Refer to: Collision Warning and Collision Avoidance System - Component Location (419-03C Collision Warning and Collision Avoidance System, Description and Operation).

Component Description

Steering Wheel Switches

The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. The switches are an input to the SIMA which is part of the LH upper steering wheel switch. For additional SIMA information,
Refer to: Steering Wheel and Column Electrical Components - System Operation and Component Description (211-05 Steering Wheel and Column Electrical Components, Description and Operation).

Brake Switch

When the brake pedal is applied, an electrical signal from stoplamp circuit to the PCM deactivates the system. Under increased brake pedal effort, the cruise control deactivator switch opens and removes the ground signal from the PCM input circuit releasing the throttle, immediately deactivating the system.

CCM

The CCM contains a radar sensing unit which measures the relative speed and the distance between the front of the vehicle and the vehicle being followed. The IPMA is responsible for requesting the PCM to increase vehicle speed and the ABS module to brake, when necessary.

IPMA

The IPMA is located on the windshield, below the interior rear view mirror. The IPMA contains a forward-looking camera with a designated sight line in front of the moving vehicle. The camera detects and differentiates between an approaching object, vehicle or pedestrian in the path of travel. This information is shared with the CCM on a dedicated private CAN circuit.

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