201593 - ADAPTIVE CRUISE CONTROL
SPECIFICATIONS
The constant speed adapative regulator ACC (Adaptive Cruise Control) assists the driver by controlling both the cruising speed and the distance from the vehicle driving in front and allows the vehicle to be driven at the desired speed without pressing the accelerator pedal.The system relieves the boredom of motorway driving, especially on long journies, because the speed memorized is automatically maintained and active driving safety is improved with a safe distance maintained from the vehicle in front. Driving at a constant speed is also beneficial for fuel economy and improves the traffic flow.The electronically controlled system is autonomous and does not therefore require communication between vehicles or other vehicles needing to be equipped with a similar system. | The speed regulator is not an "automatic pilot" but a system designed to assist the driver so that they are always fully in control of the manoeuvres they make whilst driving in traffic and are responsible for observing the highway code as well as other traffic regulations. |
| The Adaptive Cruise Control system is not an anti-collision system: it is not capable of detecting and signalling obstacles along the route, not can it stop the vehicle if there are obstacles. Any time the driver operates the brake, clutch or accelerator pedals they take over the speed control system and take responsibility for road safety. |
| the maximum deceleration implemented automatically by the system, equal to 2.5 m/s², is limited in respect of the actual capacity of the vehicle's braking system and therefore emergency braking can only be carried out by the driver. |
| The speed regulator should only be activated when traffic and route conditions allow a constant speed to be safely maintained for a sufficiently long stretch. |
 | The system can only be switched on when the speed of the vehicle is between 30 and 160 km/h and is automatically switched off by pressing the brake pedal or the clutch pedal. If, with the system on, the speed goes below 30 km/h or above 160 km/h, an acoustic signal warns the driver to resume control of the speed. |
- improved driving comfort: it removes the task of having to adjust the speed of the vehicle depending on traffic conditions from the driver
- improved safety: it maintains the distance from the vehicle in front within suitable limits
- improved economy: it allows peaceful driving and reduces consumption
- improved efficiencyP: it improves traffic flow thanks to the automatic speed control
COMPOSITION
The system components are:- radar sensor (NAC: Adaptive Cruise Control Node),
- Cruise Control setting lever.
OPERATION
The system can be viewed as an extension of the traditional Cruise Control system, not only capable of maintaining the speed set, but also of adapting the speed of the vehicle to the road traffic conditions with limited acceleration and deceleration (including the use of the brake). | The system is not activated with the gear lever in the Park, Neutral and Reverse positions or with the engine switched off. |
Traditional Cruise Control
After the desired speed has been set by the driver using the SET control, only restricted manual acceleration or deceleration operations are permittedAdaptive Cruise Control
If no vehicle is identified in the driving path, the system maintains the speed set; if, on the other hand, a vehicle is identified in the driving path, the system automatically guarantees that a safe distance is maintained from the vehicle in front.Each time the brake pedal is operated this disables the function, whilst operating the accelerator pedal allows the speed set to be exceeded without disabling the function.The driver will be informed of the data concerning the speed set, presence / absence of an obstacle and tracking via the dashboard.Driver input
There are 4 controls that the driver can take advantage of in addition to using the brake for releasing the system and the accelerator for overriding the system:- ON/OFF,
- SET + (speed increase)
- SET - (speed decrease)
- RESUME
| If the ignition key is turned to the OFF position or the ring nut is turned to the OFF position, the speed memorized is cancelled and the system is switched off. |
ON/OFF
The system is activated by the driver by turning the ring nut (3) into any of the Headway positions.When the function is switched on, the icon shown in the diagram is displayed on the instrument panel. This icon remains until the system is switched off.When the ACC system is activated the instrument panel shows "adaptive cruise control on" plus the symbol. This screen remains for 5 secs, after which the screen with the ACC symbol in the top left corner reappears.
SET
After having switched the ACC system on, the desired vehicle speed can be set using the SET control. The current speed of the vehicle is considered as the reference speed (cruising speed). This speed can automatically decrease depending on the traffic conditions and the system can move from the speed control state to the distance control state. The driver is given an indication of the sytem operating state through the display in the instrument panel. The minimum speed that can be set is 30 km/h, the maximum is 160 km/h.With the ring nut rotated the speed memorized varies continuously at intervals of around 10 km/h. The new speed reached will be automatically maintained.The moment the driver presses the SET control, the speed set will be shown on the instrument panel through the writing on the display (speed control state).SPEED INCREASE: by acting on the increase control (SET +) it is possible to increase the speed in steps of 01 km/h. The new speed set is shown on the display and replaces the previous one.SPEED DECREASE: by acting on the decrease control (SET -) it is possible to decrease the speed in steps of 10 km/h. The reduction in speed is also achieved by operating the braking system, with a maximum deceleration of 2.5 m/s². The new speed set is shown on the display and replaces the previous one.RESUME
Whilst driving with the Adaptive Cruise Control system on, the driver can disable it by operating the braking system. In this case the cruising speed set previously will be maintained in the memory and can be reactivated by pressing the RESUME button.The driver is aware of the Resume state from the flashing in the display of the speed set and they need to restore the function.If the system was in the DISTANCE CONTROL state before it was switched off, the presence of an obstacle in front remains.HEADWAY
The ring nut (3) allows the safe distance, depending on the speed, to be maintained from the vehicle in front when the distance control is activated to be set.This distance is expressed, for convenience, in seconds and represents the time needed to cover the distance that separates the vehicle from the one in front.There are three distance settings:- "far" corresponding to around 2 seconds;
- "standard" corresponding to around 1.5 seconds;
- "overtake" corresponding to around 1 second.
| the calculation of the safe distance takes into account the information coming from the outside temperature sensor. |
Override (accelerator)
The system can be temporarily bypassed by pressing the accelerator pedal; as soon as your foot is removed from the pedal the system returns to controlling the cruising speed set previously.The OVERRIDE state is indicated by the flashing of the set speed display.During this state, if the icon of an obstacle identified on the driving path is present it is activated whilst if the distance control information is present it is deactivated.Release (brake)
If the driver operates the brake pedal this disables the system.Using the system
Memorizing the speed
To memorize the speed, turn the ring nut (3) to one of the Headway positions and let the vehicle reach the desired speed normally.Turn the ring nut (2) to (SET+) for at least three seconds, then release it. The speed of the vehicle remains memorized and is shown in the instrument panel display; the accelerator pedal can now be released.The vehicle will continue driving at the constant speed memorized until one of the following conditions occurs:- the brake pedal is pressed;
- the clutch pedal is pressed.
| If necessary (for example when overtaking) it is possible to accelerate by simply pressing the accelerator pedal; afterwards, when the accelerator pedal is released, the vehicle will return to the speed memorized previously. |
Restoring the speed memorized
If the system has been switched off by pressing the brake pedal or the clutch pedal, the speed memorized can be restored as follows:- accelerate gently until a speed close to that memorized is reached;
- on versions with a manual gearbox, engage the gear selected at the time the speed was memorized (4th or 5th gear);
- press the RESUME button.
Increasing the speed memorized
The speed memorized can be increased in two ways:- by pressing the accelerator and then memorizing the new speed reached (turning the ring nut (2) kept in position for more than three seconds);
- momentarily turning the ring nut (2) to the (SET+) position: each pressing of the ring nut corresponds to an increase in speed of around 10 km/h, whilst pressing it constantly corresponds to a continuous increase in speed with intervals of around 10 km/h. When the ring nut B is released, the new speed will be automatically memorized.
Decreasing the speed memorized
The speed memorized can be decreased in two ways:- switching off the device (for example by pressing the brake pedal) and then memorizing the new speed (turning the ring nut (2) to the (SET+) position for at least three seconds);
- keeping the ring nut (2) turned in the (SET-) position until the new speed is reached which will then be automatically memorized.
Zeroing speed memorized
The speed memorized is automatically zeroed by:- switching off the engine;
- moving switch A to the OFF position.
Maintaining speed and distance
The system maintains the speed memorized when no vehicle is identified in the driving path. If, on the other hand, a vehicle is identified, the system automatically implements several interventions (acceleration, deceleration or gentle braking) to maintain the set distance from the vehicle in front. | The maximum deceleration implemented automatically by the system is limited in respect of the actual capacity of the vehicle's braking system and therefore emergency braking can only be carried out by the driver. In this case an acoustic signal warns the driver of the onset of a dangerous situation. |
Detection of an obstacle with the system ON, but not SET
With the system on (ring nut 3 turned to one of the Headway positions) but not activated (ring nut 2 not turned yet), the presence of an obstacle is not displayed until the driver operates the SET control. | Only after the driver has set the speed control at least once will the presence of an obstacle in front be indicated, even in the RESUME or OVERRIDE states, until the system is switched OFF. |
Detection of a vehicle with the system switched on
When the system is switched on, turning the ring nut (2) to the (SET+) position for at least three seconds, any vehicle in front of the vehicle (within 150 metres) in the driving path will be signalled to the driver by the following icon in the instrument panel display:
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