Cruise Control
This is an electronically controlled driving assistance device that allows the desired car speed to be maintained, without having to press the accelerator pedal. This device can be used at a speed above 30 km/h on long stretches of dry, straight roads with few variations (e.g. motorways).
Activating the Device
Turn ring nut A. Activation is indicated by the warning light on the instrument panel switching on and, on some versions, by a message on the display.
DESCRIPTION
The Cruise Control function - constant speed governor - allows the driver to drive the car at a constant speed without pressing the accelerator pedal.
The function is managed by the engine control unit. This receives commands from a Cruise Control lever on the left of the steering wheel built into the steering wheel stalk unit.
The function is activated by turning the appropriate wheel (Cruise activated to ON). Moving the lever a speed increase (+) or decrease (-) are memorised; this value is memorised and can be restored at any time by pressing the RES (resume) button.
The function is automatically deactivated:
- by pressing the brake pedal;
- by turning the wheel to "OFF";
- by turning off the engine.
In such cases, the last speed is stored and can be recalled by pressing the RES button.
The system also switches off at speeds below the minimum permitted speed (about 30 km/h).
With the system activated, the warning light in the instrument panel comes on, connected via the CAN to the engine management control unit.
FUNCTIONAL DESCRIPTION
- The Cruise Control function is managed by engine management control unit M010 upon a request by Cruise Control system control built into steering wheel stalk unit H005.
- There is a single signal sent by the steering column stalk H005 to the Body Computer M001 that manages all the Cruise Control commands: from pin 6 of steering column stalk H005 to pin 41 of connector F of Body Computer M001; the signal sent is coded by means of resistive dividers so that multiple information can be sent by the steering column stalk to the Body Computer via a single connection.
- The reference ground reaches pin 10 of steering column stalk H005 from pin 34 of connector F of Body Computer M001.
- The Body Computer M001 - connector A - receives a direct power supply from the battery through the line protected by maxi fuse F01 of the engine compartment control unit B001.
- The Body Computer M001 receives an ignition-operated power supply (INT) at pin 11 of connector F: this signal is used, amongst other things, to "wake up the network".
- The Body Computer M001 is grounded at pins 9, 10 of connector E.
In order to manage the Cruise Control function, the engine management control unit M010 also uses the brake pedal switch signals. The engine management control unit M010 is connected, via the CAN line, to the Body Computer M001 and the instrument panel E050 to manage the Cruise Control on warning light.