Fuel supply system for a road vehicle

A fuel supply system (5) for a road vehicle (1) and comprising:

• a fuel tank (6), which presents a central saddle (10) and thus is shaped like saddle and delimits an inner volume divided into an upper area (11), which is located above the central saddle (10), and two lower areas (12), which are located under the upper area (11) and are separated from one another by the central saddle (10);
• two low-pressure fuel pumps (7), which are twin pumps, are operated by corresponding electric motors (8) and each suck from the bottom of a corresponding lower area (12);
• at least one high-pressure fuel pump (9), which receives fuel from both low-pressure fuel pumps (7);
• a control unit (17), which is configured to control the electric motors (8) of the two low-pressure fuel pumps (7);
• a first level sensor (13) arranged in the upper area (11) and is configured to measure a fuel level only in the upper area (11);
• and
• two second level sensors (13), each arranged in a respective lower area (12) and configured to measure a fuel level only in the respective lower area (12);
• wherein the two lower areas (12) communicate with one another only and exclusively through the upper area (11), since there is not direct connection between the two lower areas (12) on the outside of the fuel tank (6);
• wherein the control unit (17) is configured to pre-emptively apply, to raw signals (R) provided by the three level sensors (13), a linearisation, which transforms the raw signals (R) provided by the three level sensors (13) into corresponding filling percentages (F);
• wherein the control unit (17) is configured to apply the linearisation by means of a conversion table (TB), which is inputted with the raw signal (R) coming from each level sensor (13) and outputs a corresponding filling percentage (F);
• wherein the conversion table (TB) is variable depending on a lateral acceleration and on a longitudinal acceleration to which the fuel tank (6) is subjected, so as to change a law of conversion as the lateral acceleration and the longitudinal acceleration change.

A fuel supply system (5) for a road vehicle (1) and comprising:

• a fuel tank (6), which presents a central saddle (10) and thus is shaped like saddle and delimits an inner volume divided into an upper area (11), which is located above the central saddle (10), and two lower areas (12), which are located under the upper area (11) and are separated from one another by the central saddle (10);
• two low-pressure fuel pumps (7), which are twin pumps, are operated by corresponding electric motors (8) and each suck from the bottom of a corresponding lower area (12);
• at least one high-pressure fuel pump (9), which receives fuel from both low-pressure fuel pumps (7);
• a control unit (17), which is configured to control the electric motors (8) of the two low-pressure fuel pumps (7);
• a first level sensor (13) arranged in the upper area (11) and is configured to measure a fuel level only in the upper area (11);
• and
• two second level sensors (13), each arranged in a respective lower area (12) and configured to measure a fuel level only in the respective lower area (12);
• wherein the two lower areas (12) communicate with one another only and exclusively through the upper area (11), since there is not direct connection between the two lower areas (12) on the outside of the fuel tank (6);
• wherein the control unit (17) is configured to:
• establish a target fuel pressure (PfuelTGT) downstream of the low-pressure fuel pumps (7);
• and determine a rotation speed (ωmotor) of the electric motors (8) of the two low-pressure fuel pumps (7) depending on the target fuel pressure (PfuelTGT).