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Adaptive Cruise Control With Stop And Go: Notes

DESCRIPTION 

GC0192898Courtesy of CHRYSLER GROUP, LLC

The following components are part of the Adaptive Cruise Control (ACC) with Stop and Go system:

COMPONENT INDEX

1. Refer to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE  .
2. Refer to POWERTRAIN CONTROL MODULE (PCM)  .
3. Refer to BODY CONTROL MODULE (BCM)  .
4. Refer to DRIVERS ASSISTANCE SYSTEM MODULE (DASM)  .
5. Refer to RADIO  .
6. Refer to INSTRUMENT PANEL CLUSTER (IPC)  .
7. Refer to CRUISE CONTROL SWITCH MODULE (CSWC)  .
8. Refer to STEERING COLUMN CONTROL MODULE (SCCM)  .

Adaptive Cruise Control (ACC) with Stop and Go is a Driver Assistance System with functionality beyond that of the conventional Cruise Control system.

When the ACC with Stop and Go equipped vehicle is brought to a stop due to the presence of a slower moving target vehicle, the ACC with Stop and Go system can keep the host vehicle at a stand-still by initially applying the brakes, and once the brake system times out, by applying the Electronic Park Brake (EPB). However, if the target vehicle starts moving before the brake system times out, the ACC with Stop and Go system allows the vehicle to automatically resume motion with little or no driver intervention.

Vehicles that are equipped with the ACC with Stop and Go system incorporate the DASM to control the ACC with Stop and Go system and conventional Cruise Control system.

OPERATION 

The ACC On/Off button in the CSWC can be used to enable or disable the ACC with Stop and Go system. The CSWC sends the status of the ACC button to the SCCM over the Local Interface Network (LIN) network. The SCCM gates this signal to the DASM.

Once the system in enabled, the ACC with Stop and Go or the conventional Cruise Control system can be engaged by pressing the Set+ or Set- buttons in the CSWC. The CSWC transmits the Set button state to the SCCM. The SCCM gates the signal to the DASM. If driver override occurs and either Set button is pressed, the current speed becomes the new set speed. The DASM determines the set speeds based on the vehicle speed value received from the ABS module.

For ACC with Stop and Go, the driver can configure the set target distance by using either of the two distance buttons in the CSWC. These button are:

The CSWC sends the status of the Distance buttons to the SCCM which gates the request to the DASM.

The Distance value is interpreted as a time gap by the DASM. This value is modified by the presence of a Trailer Tow Module (TTM) that is actively operating during ACC with Stop and Go operation.

When the Resume or Cancel button is used, the CSWC sends the request to the SCCM which gates the request to the DASM.

For the North American Free Trade Agreement (NAFTA) vehicle, the range of operation for the ACC with Stop and Go system is a minimum of 32 Kilometers Per hour (km/h) (20 Miles Per Hour/mph) and a maximum of 160 km/h (100 mph).

The DASM transmits the ACC with Stop and Go or the conventional Cruise Control system states over the Controller Area Network (CAN) bus. When the ACC with Stop and Go is in use, the DASM also transmits the adjusted vehicle speed on the CAN bus. The adjusted speed is determined when the DASM detects a target vehicle in the path of the host vehicle and the system is in the Engaged/Set state. The system automatically configures the speed of the host vehicle to the speed of the target vehicle and trails the target vehicle at a set following distance. In this case the desired speed of the vehicle will be less than the set speed.

The DASM uses its own internal logic to convert the vehicle speed that is sent to it by the ABS module to the vehicle speed that is to be displayed to the driver on the IPC.

The DASM uses an integral radar and camera, by means of data fusion, to detect vehicles in the forward path of the vehicle that are moving, stopped or stationary. The DASM considers an object moving if it has a velocity greater than zero while being tracked. The DASM considers an object stopped if it has a velocity greater than zero and then comes to a stop. The DASM will consider an object stationary if it has zero velocity the entire time that it is being tracked.

When the DASM detects that an object with velocity is slowing to a stop, the DASM sends a request to the ABS module for braking. The ABS module then sends a signal back to the DASM confirming that the host vehicle is at a complete stop. The ABS module then begins an internal timer countdown and holds the brake. If the target object begins to accelerate, the DASM sends the request to the ABS module to release the brakes. If the countdown timer expires before the target vehicle starts to accelerate, the DASM sends a request to the ABS module to apply the EPB until the target object begins to move. At this point, the DASM sends a request to the ABS module to release the EPB. If the host vehicle is on an incline and the ABS modules internal timer expires, movement of the host vehicle will require driver override by depressing the accelerator pedal or by pressing the Resume button. The driver override condition is detected by the PCM and sent to the DASM while the Resume button actuation is detected by the SCCM and bussed to the DASM.

When the host vehicle is brought to a stop due to DASM object detection, the driver seatbelt status and the driver door ajar signal are monitored. If the seatbelt buckle is unbuckled or the door becomes ajar, the system will become disabled once the EPB is applied.

The DASM also requests a brake prefill command to the ABS module. Under normal circumstances, there is space between the brake pads and the brake rotors to prevent the brake pads from wearing out prematurely. This space between the brake pads and the brake rotors increases the response time during any situation which may require emergency braking. The brake prefill prepares the system for braking by moving the brake pads closer to the brake rotor to improve braking response time. The DASM controls the activation and deactivation of the brake prefill operation.

If the ACC system is unable to maintain the following distance, a take over request is issued. This is a request for the vehicle driver to take control of the vehicle for safety reasons. This request is initiated by the system simultaneously sending an audible and visual warning to the IPC, along with an audio warning to the audio system. A take over request can also be initiated by the DASM when there is a close cut-in of a vehicle from an adjacent lane to the lane that the host vehicle is currently occupying.

The ACC system is also capable of providing proximity warning. A proximity warning occurs when an object or a vehicle in close proximity is detected. This warning will alert the driver if the ACC system predicts that its maximum braking level is not sufficient to maintain the set distance. Like the take over request warning, the proximity warning system request is initiated by the system simultaneously sending an audible and visual warning to the IPC, along with an audio warning to the audio system.

The DASM is able to determine its acceleration, deceleration and gear requests by utilizing sensor data along with specific data received from the PCM, ABS module and the TCM (MTX not supported for this function). This allows for when the slower moving object or vehicle is no longer detected, the ACC with Stop and Go system will accelerate the host vehicle back to the original set speed with no customer interaction. Using those same inputs, the DASM also allows for an overtake event to occur. When the host vehicle is trailing a slower moving object and the host driver activates the turn indicator, the DASM applies additional amounts of acceleration while still trailing the object vehicle to aid in a lane shift maneuver. In locations with left hand drive traffic, overtake aid will only be provided on the left hand side. The same applies for the right hand side. The DASM is able to determine the direction of traffic flow by observing oncoming traffic. The DASM will disable overtake aid if the DASM detects an object in the lane the vehicle is attempting to move into in order to pass the slower moving object vehicle. The overtake aid also disables or will not assist if the host vehicle is equipped with a Blind Spot Monitor (BSM) system that is currently detecting a vehicle in the blind spot of the host vehicle.

For transmission shift requests, the DASM sends the gear requests to the ABS module which in turn sends the request to the TCM as well as the ACC with Stop and Go system status. The DASM transmits the current set speed as well as the DASM requested desired speed to the TCM. The TCM uses this information to enable a internal logic cruise shift strategy.

Deactivation Conditions:

The ACC with Stop and Go system has several cancel and switch-off conditions that will deactivate the system. The conditions are as follows:

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