SENSOR BASED MEASUREMENT AND PURGE CONTROL OF FUEL VAPORS IN INTERNAL COMBUSTION ENGINES

• US 20150051811A1
• Filed: 08/15/2013
• Published: 02/19/2015
• Est. Priority Date: 08/15/2013
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Song, B. Jerry, Casetti, Martino, Jeffrey, Scott, Avallone, Louis A.
• Granted Patent: US 9,631,567 B2
• Time in Patent Office: Days
• US Class Current: 701/104
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2250/08 Engine blow-by from crankcase chamber
• CPC Class Codes: F02D 41/0045 Estimating, calculating or determining the purging rate, amount, flow or concentration
• CPC Class Codes: F02D 41/0055 Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
• CPC Class Codes: F02D 41/02 Circuit arrangements for generating control signals
• CPC Class Codes: F02D 41/04 Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/144 Sensor in intake manifold
• CPC Class Codes: F02D 41/1448 the characteristics being an exhaust gas pressure
• CPC Class Codes: F02D 41/1456 with sensor output signal being linear or quasi-linear with the concentration of oxygen
• CPC Class Codes: F02D 41/1458 with determination means using an estimation
• CPC Class Codes: F02D 41/1495 Detection of abnormalities in the air/fuel ratio feedback system
• CPC Class Codes: F02D 41/2474 Characteristics of sensors
• CPC Class Codes: F02M 25/089 Layout of the fuel vapour installation
• CPC Class Codes: G01L 19/0092 Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature G01L9/025, G01L9/045, G01L9/065, G01L9/085, G01L9/105, G01L9/125, G01L19/02, G01L19/04 take precedence; measuring two or more variable G01D21/02; temperature sensors with pressure compensation G01K1/26

Abstract

A fuel control system for a vehicle includes a pressure compensation module that compensates an intake oxygen signal based on an intake pressure signal and that generates a compensated intake oxygen signal. A blow-by estimation module generates an estimated blow-by flow. A purge flow estimation module estimates the purge flow based on the compensated intake oxygen signal and the estimated blow-by flow. A fuel control estimation module reduces fueling to injectors of an engine of the vehicle based on the purge flow.

Claims

1. A fuel control system for a vehicle, comprising:

a pressure compensation module that compensates an intake oxygen signal based on an intake pressure signal and that generates a compensated intake oxygen signal;

a blow-by estimation module that generates an estimated blow-by flow;

a purge flow estimation module that estimates the purge flow based on the compensated intake oxygen signal and the estimated blow-by flow; and

a fuel control estimation module that reduces fueling to injectors of an engine of the vehicle based on the purge flow.

2. The fuel control system of claim 1, wherein the purge flow estimation module estimates a sum of blow-by flow and the purge flow based on the compensated intake oxygen signal.

3. The fuel control system of claim 2, wherein the purge flow estimation module estimates the sum of the blow-by flow and the purge flow using a lookup table indexed by the compensated intake oxygen signal.

4. The fuel control system of claim 2, wherein the purge flow estimation module includes a difference module that subtracts the estimated blow-by flow generated by the blow-by estimation module from the sum of the purge flow and the blow-by flow.

5. The fuel control system of claim 1, wherein the blow-by estimation module estimates the blow-by flow based on intake manifold pressure.

6. The fuel control system of claim 1, wherein the blow-by estimation module estimates the blow-by flow using a lookup table indexed by intake manifold pressure.

7. The fuel control system of claim 1, wherein the blow-by estimation module estimates the estimated blow-by flow only when a purge valve is closed.

8. The fuel control system of claim 1, wherein the purge flow estimation module estimates the purge flow only when a purge valve is open.

9. The fuel control system of claim 1, wherein the blow-by estimation module and the purge flow estimation module are enabled only when an exhaust gas recirculation valve of the vehicle is closed.

10. The fuel control system of claim 1, wherein the pressure compensation module compensates for static and dynamic pressure.

11. A method for controlling a fuel control system of a vehicle, comprising:

compensating an intake oxygen signal based on an intake pressure signal to generate a compensated intake oxygen signal;

generating an estimated blow-by flow;

estimating a purge flow based on the compensated intake oxygen signal and the estimated blow-by flow; and

reducing fueling to injectors of an engine of the vehicle based on the purge flow.

12. The method of claim 11, further comprising estimating a sum of blow-by flow and the purge flow based on the compensated intake oxygen signal.

13. The method of claim 12, further comprising estimating the sum of the blow-by flow and the purge flow using a lookup table indexed by the compensated intake oxygen signal.

14. The method of claim 12, further comprising subtracting the estimated blow-by flow from the sum of the purge flow and the blow-by flow.

15. The method of claim 11, further comprising estimating the blow-by flow based on intake manifold pressure.

16. The method of claim 11, further comprising estimating the blow-by flow using a lookup table indexed by intake manifold pressure.

17. The method of claim 11, further comprising estimating the estimated blow-by flow only when a purge valve is closed.

18. The method of claim 11, further comprising estimating the purge flow only when a purge valve is open.

19. The method of claim 11, further comprising enabling estimation of the blow-by flow and the purge flow only when an exhaust gas recirculation valve of the vehicle is closed.

20. The method of claim 11, wherein the pressure compensation includes compensation for static and dynamic pressure.