Vacuum supply system
First Claim
Patent Images
1. A method of operating a boosted engine system including a fuel vapor canister, a purge pump, and an ejector, comprising,pumping a purge flow through the fuel vapor canister, through the ejector, and into an engine intake;
- andapplying the ejector to a vacuum actuator.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of operating a boosted engine system is described in which an ejector coupled with a fuel vapor purging system can generate vacuum during both purging and non-purging conditions, and during both boosted and non-boosted conditions. The vacuum can therefore be used to power vacuum actuated brakes, and/or other vacuum actuators, irrespective of the purging conditions, and irrespective of boost levels.
56 Citations
20 Claims
-
1. A method of operating a boosted engine system including a fuel vapor canister, a purge pump, and an ejector, comprising,
pumping a purge flow through the fuel vapor canister, through the ejector, and into an engine intake; - and
applying the ejector to a vacuum actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- and
-
9. A method of operating a fuel vapor recovery system including a fuel vapor canister, a purge pump, and one or more ejectors, the fuel vapor recovery system coupled to a boosted engine intake, comprising,
during a purging condition, operating the purge pump to pump a purge flow through the canister, through the one or more ejectors, and into the engine intake, and applying vacuum from the one or more ejectors to a vacuum actuator; - and
during a non-purging condition, operating the purge pump to drive an air flow bypassing the canister, through the one or more ejectors, and into the engine intake, and applying vacuum from the one or more ejectors to the vacuum actuator. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- and
-
17. An engine system, comprising,
an engine intake; -
a boosting device including a compressor configured to boost intake air; a fuel vapor canister configured to receive fuel vapors from a fuel tank, the fuel vapor canister communicating with atmosphere via a first canister vent valve and a second vapor bypass valve; a purge pump; an ejector coupled downstream of the pump; a vacuum actuator; and a controller configured to, operate the compressor to provide a boost; and in the presence of boost, operate the purge pump to pump a purge flow through the canister, through the ejector, into the engine intake, during purging conditions; and operate the purge pump to pump an air flow bypassing the canister, through the ejector, into the engine intake, during non-purging conditions; and during purging and non-purging conditions, apply vacuum from the ejector to the vacuum actuator. - View Dependent Claims (18, 19, 20)
-
Specification