Fuel Vapor Flow Estimation Systems And Methods
First Claim
1. A control system of a vehicle, comprising:
- a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle;
a purge valve that, when open, allows fuel vapor flow into an intake system of an engine at a first location and that, when closed, prevents fuel vapor flow to the intake system of the engine; and
a purge control module that controls opening of the purge valve and that determines a fuel vapor flow into cylinders of the engine based on;
(i) a first pressure at the first location, (ii) a second pressure at a second location between the purge valve and the intake system, and (iii) at least one delay period between opening of the purge valve and fuel vapor reaching cylinders of the engine.
1 Assignment
0 Petitions
Accused Products
Abstract
A control system of a vehicle includes a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle. A purge valve, when open, allows fuel vapor flow into an intake system of an engine at a first location and, when closed, prevents fuel vapor flow to the intake system of the engine. A purge control module controls opening of the purge valve and determines a fuel vapor flow into cylinders of the engine based on: (i) a first pressure at the first location, (ii) a second pressure at a second location between the purge valve and the intake system, and (iii) at least one delay period between opening of the purge valve and fuel vapor reaching cylinders of the engine.
34 Citations
20 Claims
-
1. A control system of a vehicle, comprising:
-
a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle; a purge valve that, when open, allows fuel vapor flow into an intake system of an engine at a first location and that, when closed, prevents fuel vapor flow to the intake system of the engine; and a purge control module that controls opening of the purge valve and that determines a fuel vapor flow into cylinders of the engine based on;
(i) a first pressure at the first location, (ii) a second pressure at a second location between the purge valve and the intake system, and (iii) at least one delay period between opening of the purge valve and fuel vapor reaching cylinders of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A control method for a vehicle, comprising:
-
by a fuel vapor canister, trapping fuel vapor from a fuel tank of the vehicle; selectively opening a purge valve to allow fuel vapor flow into an intake system of an engine at a first location; selectively closing the purge valve to prevent fuel vapor flow to the intake system of the engine; and determining a fuel vapor flow into cylinders of the engine based on;
(i) a first pressure at the first location, (ii) a second pressure at a second location between the purge valve and the intake system, and (iii) at least one delay period between opening of the purge valve and fuel vapor reaching cylinders of the engine. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification