General information
Fig. 1.48. Speed regulation and limitation control system: 1 – three-position switch; 2 – switches on the steering wheel; 3 – instrument panel; 4 – Injection system control unit; 5 – accelerator pedal position sensor; 6 – brake light switch (double); 7 – clutch pedal travel sensor (start of the move); 8 – Automatic transmission control unit; 9 – Anti-lock braking system ECU; 10 – throttle valve block
The vehicles are equipped with the following controls:
- cruise control system, which allows the driver to maintain a speed selected by the driver. This function can be switched off at any time by pressing the brake pedal or one of the system switches;
- a speed limitation system that allows the driver to set a maximum speed. If it is exceeded, pressing the accelerator pedal does not increase the vehicle's speed. The selected speed can be increased at any time by pressing the accelerator pedal past the resistance point.
The functions "Cruise control" and "Speed limitation" are controlled by the injection system ECU. The injection system ECU exchanges information with the ABS ECU, UCH, and AT ECU (if there is one) and the instrument panel. The injection system ECU implements the specified values by issuing control commands to the throttle valve unit with a servo drive or by regulating the supply of diesel fuel.
Note: Flashing of the indicator light on the instrument panel indicates that the set speed cannot be maintained (for example, when driving downhill).
Description of the system operation
The UCH sends the information "brake pedal pressed" (signal from the closing contact of the brake light switch).
The ABS ECU sends information about the vehicle speed.
Automatic transmission control unit (if there is one) sends information about the "gear engaged".
The selected speed value is displayed on the instrument panel (for adjustable or limited) and the type of function enabled (three-color signal lamp).
Each time these functions are activated, the trip computer display switches to the corresponding page.
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Note: There is no malfunction indicator lamp for the cruise control and speed limit functions.
Governing bodies
The three-position switch enables the speed controller or speed limiter to be turned on and off.
The switches on the steering wheel are used to change the set speed, cancel the function or recall the speed value from memory.
The accelerator pedal position sensor and brake light switch are shared with the injection system.