Fuel saving driving assistance apparatus

• US 8,185,266 B2
• Filed: 02/16/2010
• Issued: 05/22/2012
• Est. Priority Date: 03/11/2009
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Itoh, Yasuyuki
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US12/656,734
• Publication Number:
  US 20100235038A1
• Time in Patent Office: 826 Days
• Field of Search: 701/31.4, 701/34.4, 701/86, 701/93, 180/335
• US Class Current: 701/31.1
• CPC Class Codes: B60R 16/0236 for economical driving
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration

Abstract

It is determined whether a vehicle enters a halting state or a slow moving state. It is detected that an accelerator opening degree of the vehicle is zero during a deceleration duration up to the time to enter the halting state or the slow moving state. Further, an accelerator zero duration is calculated which is a duration for which the vehicle is in the halting state or the slow moving state while the accelerator opening degree is zero. Furthermore, an accelerator zero travel distance is calculated which the vehicle runs during the calculated accelerator zero duration. Based on the accelerator zero travel distance, it is determined whether the fuel saving driving operation is performed in traveling during the accelerator zero travel duration. Even in the state where the travel speed of the vehicle changes more than needs during inertia travel, the fuel saving driving operation is diagnosed appropriately.

Claims

1. A fuel saving driving assistance apparatus for a vehicle, the apparatus comprising:

a travel state determining section to determine a travel state as to whether the vehicle is in a halting state or in a slow moving state;

an accelerator opening determining section to determine an accelerator opening as to whether an accelerator opening degree of an accelerator of the vehicle is zero; and

a driving operation diagnosing section to diagnose a driving operation as to whether a fuel saving driving operation is performed,

the driving operation diagnosing section being further configured to

calculate, based on determination results by the travel state determining section and the accelerator opening determining section, an accelerator zero travel duration within a deceleration duration,

the accelerator zero travel duration being a travel duration for which the vehicle travels in a state where the accelerator opening degree is zero,

the deceleration duration being a duration up to a time when the vehicle becomes in the halting state or the slow moving state,

calculate an accelerator zero travel distance, which is a travel distance traveled by the vehicle for the calculated accelerator zero travel duration, and

determine, based on the calculated accelerator zero travel distance, whether a fuel saving driving operation was performed with respect to a driving operation during the accelerator zero travel duration.

2. The fuel saving driving assistance apparatus according to claim 1, wherein

the travel state determining section is further configured to determine that the vehicle is in the halting state or in the slow moving state in cases that a vehicle speed corresponding to a travel speed of the vehicle is less than a predetermined speed value and an acceleration of the vehicle continues to be negative for a predetermined duration.

3. The fuel saving driving assistance apparatus according to claim 1, wherein

the travel state determining section is further configured to determine that the vehicle is in the halting state or in the slow moving state in cases that it is detected that the vehicle is halting or turning at an intersection based on a present position of the vehicle and map data.

4. The fuel saving driving assistance apparatus according to claim 1, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a fuel quantity which the vehicle consumes in a predetermined time is less than a predetermined value.

5. The fuel saving driving assistance apparatus according to claim 1, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a number of rotations per a predetermined time of an engine of the vehicle is less than a predetermined value.

6. The fuel saving driving assistance apparatus according to claim 1, wherein

the driving operation diagnosing section is further configured to

determine that the fuel saving driving operation was performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is equal to or greater than a reference value, and

determine that the fuel saving driving operation was not performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is less than the reference value.

7. The fuel saving driving assistance apparatus according to claim 6, wherein

the driving operation diagnosing section is further configured to change the reference value depending on the vehicle speed at a start of the accelerator zero travel duration with reference to a reference value map, which sets up the reference value.

8. The fuel saving driving assistance apparatus according to claim 1, further comprising:

a notifying section to provide a report when the driving operation diagnosing section determines that the fuel saving driving operation was not performed with respect to the driving operation during the accelerator zero travel duration,

the report indicating that the fuel saving driving was not performed with respect to the driving operation during the accelerator zero travel duration.

9. The fuel saving driving assistance apparatus according to claim 2, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a fuel quantity which the vehicle consumes in a predetermined time is less than a predetermined value.

10. The fuel saving driving assistance apparatus according to claim 2, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a number of rotations per a predetermined time of an engine of the vehicle is less than a predetermined value.

11. The fuel saving driving assistance apparatus according to claim 2,

the driving operation diagnosing section is further configured to

determine that the fuel saving driving operation was performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is equal to or greater than a reference value, and

determine that the fuel saving driving operation was not performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is less than the reference value.

12. The fuel saving driving assistance apparatus according to claim 11, wherein

the driving operation diagnosing section is further configured to change the reference value depending on the vehicle speed at a start of the accelerator zero travel duration with reference to a reference value map, which sets up the reference value.

13. The fuel saving driving assistance apparatus according to claim 3, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a fuel quantity which the vehicle consumes in a predetermined time is less than a predetermined value.

14. The fuel saving driving assistance apparatus according to claim 3, wherein

the accelerator opening determining section is further configured to determine that the accelerator opening degree is zero in cases that a number of rotations per a predetermined time of an engine of the vehicle is less than a predetermined value.

15. The fuel saving driving assistance apparatus according to claim 3, wherein

the driving operation diagnosing section is further configured to

determine that the fuel saving driving operation was performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is equal to or greater than a reference value, and

determine that the fuel saving driving operation was not performed with respect to the driving operation during the accelerator zero travel duration when the accelerator zero travel distance is less than the reference value.

16. The fuel saving driving assistance apparatus according to claim 15, wherein

the driving operation diagnosing section is further configured to change the reference value depending on the vehicle speed at a start of the accelerator zero travel duration with reference to a reference value map, which sets up the reference value.

17. A program product stored in a non-transitory computer readable storage medium comprising instructions for execution by a computer, the instructions including a computer-implemented method for a fuel saving driving assistance apparatus in a vehicle, the instructions for implementing the steps of:

determining a travel state as to whether the vehicle is in a halting state or in a slow moving state;

determining an accelerator opening as to whether an accelerator opening degree of an accelerator of the vehicle is zero;

calculating, based on determination results by the step of determining the travel state and the step of determining the accelerator opening, an accelerator zero travel duration within a deceleration duration,

the accelerator zero travel duration being a travel duration for which the vehicle travels in a state where the accelerator opening degree is zero,

the deceleration duration being a duration up to a time when the vehicle becomes in the halting state or the slow moving state;

calculating an accelerator zero travel distance, which is a travel distance traveled by the vehicle for the calculated accelerator zero travel duration; and

determining, based on the calculated accelerator zero travel distance, whether a fuel saving driving operation was performed with respect to a driving operation during the accelerator zero travel duration.