Process and System for Determining Fuel Consumption of a Motor Vehicle

A device for determining fuel consumption of a motor vehicle, comprising:

• a first mean fuel consumption determining unit, which cannot be reset under a user's influence;
• a second mean fuel consumption determining unit, which is resettable under a user's influence, as a function of several measured values;
• a third mean fuel consumption determining unit, said third unit being operatively configured to:
• (a) at a beginning of a predefined time period, which starts with a resetting of the second mean fuel consumption, set the third mean fuel consumption to be equal to the first mean fuel consumption;
• (b) between the beginning and the end of the predefined time period, which starts with a resetting of the second of the second mean fuel consumption influenced by the user, set the third mean fuel consumption to be a weighted mean of the first mean fuel consumption and the second mean fuel consumption;
• and
• (c) starting at an end of the predefined time period, set the third mean fuel consumption to be equal to the second mean fuel consumption;
• and
• a signal indicative of the third mean fuel consumption.

A system for a motor vehicle, comprising:

• a device for determining fuel consumption of the motor vehicle, the device comprising:
• a first mean fuel consumption determining unit, which cannot be reset under a user's influence;
• a second mean fuel consumption determining unit, which is resettable under a user's influence, as a function of several measured values;
• a third mean fuel consumption determining unit, said third unit being operatively configured to:
• (a) at a beginning of a predefined time period, which starts with a resetting of the second mean fuel consumption, set the third mean fuel consumption to be equal to the first mean fuel consumption;
• (b) between the beginning and the end of the predefined time period, which starts with a resetting of the second of the second mean fuel consumption influenced by the user, set the third mean fuel consumption to be a weighted mean of the first mean fuel consumption and the second mean fuel consumption;
• and
• (c) starting at an end of the predefined time period, set the third mean fuel consumption to be equal to the second mean fuel consumption;
• and
• a signaling unit operatively coupled with the device for determining fuel consumption, the signaling unit receiving a signal indicative of the third mean fuel consumption from the device for determining fuel consumption and outputting a signal for a user of the motor vehicle.