Boost-assisted purge flow techniques for evaporative emissions systems
First Claim
1. An evaporative emissions (EVAP) system for a vehicle having an engine with a boost system, the EVAP system comprising:
- a vapor canister configured to store fuel vapor evaporated from a liquid fuel housed in a fuel tank of the vehicle;
a boost line connected between a high-pressure side of the boost system and the vapor canister and configured to provide high-pressure air to the vapor canister;
a boost pressure control valve disposed in-line along the boost line and configured to control an amount of high-pressure air flowing through the boost line and into the vapor canister to force the fuel vapor out of the vapor canister;
a set of purge lines connected between the vapor canister and at least one of the engine, an induction system of the engine, and an exhaust treatment system of the engine; and
a controller configured to control the boost pressure control valve to control an amount of the fuel vapor forced from the vapor canister through at least one purge line of the set of purge lines.
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Abstract
A vapor canister of an evaporative emissions (EVAP) system is configured to store fuel vapor evaporated from a liquid fuel housed in a fuel tank of a vehicle. A boost line is connected between a high-pressure side of a boost system of an engine and the vapor canister, a boost pressure control valve is disposed in-line along the boost line and configured to control an amount of boost pressure provided to the vapor canister, and a set of purge lines are connected between the vapor canister and at least one of the engine, an induction system of the engine, and an exhaust treatment system of the engine. A controller is configured to control the boost pressure control valve to control the boost pressure provided to the vapor canister to control an amount of fuel vapor forced from the vapor canister through at least one of the set of purge lines.
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Citations
18 Claims
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1. An evaporative emissions (EVAP) system for a vehicle having an engine with a boost system, the EVAP system comprising:
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a vapor canister configured to store fuel vapor evaporated from a liquid fuel housed in a fuel tank of the vehicle; a boost line connected between a high-pressure side of the boost system and the vapor canister and configured to provide high-pressure air to the vapor canister; a boost pressure control valve disposed in-line along the boost line and configured to control an amount of high-pressure air flowing through the boost line and into the vapor canister to force the fuel vapor out of the vapor canister; a set of purge lines connected between the vapor canister and at least one of the engine, an induction system of the engine, and an exhaust treatment system of the engine; and a controller configured to control the boost pressure control valve to control an amount of the fuel vapor forced from the vapor canister through at least one purge line of the set of purge lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating an evaporative emissions (EVAP) system for a vehicle having an engine with a boost system, the method comprising:
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storing, in a vapor canister, fuel vapor evaporated from a liquid fuel housed in a fuel tank of the vehicle, the vapor canister being connected to a set of purge lines that connect the vapor canister to at least one of the engine, an induction system of the engine, and an exhaust treatment system of the engine; and controlling, by a controller of the vehicle, a boost pressure control valve to control an amount of the fuel vapor forced from the vapor canister through at least one purge line of the set of purge lines, the boost pressure control valve being disposed inline along a boost line that is (i) connected between a high-pressure side of the boost system and the vapor canister and (ii) configured to provide high-pressure air to the vapor canister, wherein the boost pressure control valve is configured to control an amount of high-pressure air flowing through the boost line and into the vapor canister to force the fuel vapor out of the vapor canister. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification