Methods for determining exhaust emissions and efficiency of a vehicle and a display

• US 8,332,121 B2
• Filed: 05/14/2012
• Issued: 12/11/2012
• Est. Priority Date: 11/13/2009
• Status: Active Grant

• Current Assignee: Greendrive Pty., Ltd.
• Original Assignee: Greendrive Pty., Ltd.
• Inventors: Adams, Danny Hyland Stewart
• Primary Examiner(s): Jeanglaude, Gertrude Arthur
• Application Number:
  US13/470,961
• Publication Number:
  US 20120226424A1
• Time in Patent Office: 211 Days
• Field of Search: 701/66, 701/93, 701/101, 701/104, 73/233.1, 731/146.9, 731/147.1, 602/78
• US Class Current: 701/93
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 2550/02 Catalytic activity of catalytic converters
• CPC Class Codes: F01N 2560/00 Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
• CPC Class Codes: F01N 2900/08 said parameters being related to the engine
• CPC Class Codes: F01N 2900/14 said parameters being related to the exhaust gas
• CPC Class Codes: F01N 2900/1402 Exhaust gas composition
• CPC Class Codes: F01N 3/20 specially adapted for catalytic conversion F01N3/22 takes precedence; Methods of operation or control of catalytic converters
• CPC Class Codes: F02D 2200/0625 Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
• CPC Class Codes: G01L 3/26 Devices for measuring efficiency, i.e. the ratio of power output to power input
• CPC Class Codes: G01M 15/102 by monitoring exhaust gases
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

Methods, software codes, and devices for determining an emission flow rate of one or more CO₂ equivalent gases from an exhaust system of an internal combustion engine of a vehicle and a method of determining a vehicle efficiency factor of the vehicle are provided. The vehicle efficiency factor is compared in real time to the corresponding point on a vehicle efficiency map based on at least one of current vehicle conditions, driving conditions, environmental conditions, and energy flow visualization data to derive a driver efficiency factor.

Claims

1. A method of determining a vehicle efficiency factor (E) for a vehicle powered by an internal combustion engine, the engine powered by a fuel, the method comprising:

determining a fuel chemical energy input (F), a change in a kinetic energy (K), a change in a potential energy (P), a magnitude of aerodynamic frictional losses (A), a magnitude of mechanical frictional losses (M), and a magnitude of braking frictional losses (B) of the vehicle over a predetermined time interval; and

determining the vehicle efficiency factor (E) for the predetermined time interval based on a comparison between a total energy input and a total energy output, the total energy input including the fuel chemical energy input (F), the total energy output including the change in the kinetic energy (K), the change in the potential energy (P), the aerodynamic frictional losses (A), and the mechanical frictional losses (M) of the vehicle.

2. The method according to claim 1, wherein:

the fuel chemical energy input (F) is based on fuel data and a quantity of fuel consumed by the engine; and

the fuel data is downloaded from the Internet based on one or more of the parameters selected from a type of the fuel, an origin of the fuel, blend factors of the fuel, and seasonal factors of the fuel.

3. The method according to claim 1, wherein a magnitude of the aerodynamic frictional losses (A) is based on air density, a speed of the vehicle, and an aerodynamic friction coefficient, and is derived using a mathematical calculation or a reference to a lookup table.

4. The method according to claim 1, wherein a magnitude of the mechanical frictional losses (M) is based on a speed of the vehicle, a mass of the vehicle, and a mechanical friction coefficient, and is derived using a mathematical calculation or a reference to a lookup table.

5. The method according to claim 1, wherein the magnitude of braking frictional losses (B) is determined based on change in the kinetic energy (K) and change in the potential energy (P) of the vehicle under braking conditions.

6. The method according to claim 3, wherein the aerodynamic friction coefficient is updated in real time by a coast down method.

7. The method according to claim 4, wherein the mechanical friction coefficient is updated in real time by a coast down method.

8. The method according to claim 1, further comprising the step of generating energy flow visualization data for the predetermined time interval.

9. The method according to claim 8, wherein the energy flow visualization data comprises information with regards to inter-conversion of one or more of the fuel chemical energy input (F), the change in the kinetic energy (K), the change in the potential energy (P), the aerodynamic frictional losses (A), and the mechanical frictional losses (M) of the vehicle over the predetermined time interval.

10. The method according to claim 8, wherein the energy flow visualization data comprises a measure of vehicle efficiency and a measure of braking frictional losses (B).

11. The method according to claim 1, wherein the vehicle efficiency factor (E) is recorded in the vehicle in real time and is used to statistically determine a vehicle efficiency map based on differing engine conditions, driving conditions, and environmental conditions.

12. The method according to claim 11, wherein a current value of the vehicle efficiency factor (E) is compared in real time to a corresponding point on the vehicle efficiency map based on at least one of current vehicle conditions, driving conditions, environmental conditions, and energy flow visualization data to derive a driver efficiency factor.

13. The method according to claim 12, wherein the driver efficiency factor is represented numerically, graphically, or pictorially through a monochrome or color display in the vehicle.

14. The method according to claim 1, wherein:

the vehicle comprises a cruise control system; and

the cruise control system is controlled based on maximization of the vehicle efficiency factor (E).

15. The method according to claim 12, wherein:

the vehicle comprises a cruise control system; and

the cruise control system is controlled based on maximization of the driver efficiency factor.

16. The method according to claim 8, further comprising displaying the energy flow visualization data.

17. The method according to claim 16, wherein:

each of the fuel chemical energy input (F), the change in the kinetic energy (K), and the change in the potential energy (P) is illustrated as graphic volume elements interconnected by graphic connection elements; and

energy flow is illustrated by a change in at least one characteristic of graphic connection elements.

18. The method according to claim 16, wherein one or more of the aerodynamic frictional losses (A), the mechanical frictional losses (M), the braking frictional losses (B), and other energy losses are illustrated as energy flow out of one or more of the graphic connection elements.

19. The method according to claim 16, wherein the graphic volume elements represent at least one of absolute energy values, costs of the energy, and carbon or CO₂ mass equivalent of the energy.

20. The method according to claim 16, wherein, if an inefficiency is present with respect to inter-conversion of energy from or to any one or more of fuel chemical energy (F), the change in the kinetic energy (K), the change in the potential energy (P), the aerodynamic frictional losses (A), the mechanical losses (M), and the braking frictional losses (B), one of:

at least one characteristic of the graphic volume element is changed; and

at least one characteristic of one or more of the connecting graphic connection elements is changed.