EVAPORATIVE EMISSIONS CONTROL SYSTEM INCLUDING A PURGE PUMP AND HYDROCARBON SENSOR
First Claim
1. An evaporative emissions (EVAP) control system for a vehicle, the EVAP control system comprising:
- a purge pump configured to pump fuel vapor trapped in a vapor canister to an engine of the vehicle via a vapor line, the fuel vapor resulting from evaporation of a liquid fuel stored in a fuel tank of the engine;
a hydrocarbon (HC) sensor disposed in the vapor line and configured to measure an amount of HC in the fuel vapor pumped by the purge pump to the engine via the vapor line; and
a controller configured to(i) determine a desired amount of fuel vapor to deliver to the engine;
(ii) detect an operating condition of the engine where engine vacuum is less than an appropriate level for delivering the desired amount of fuel vapor to the engine without using the purge pump; and
(iii) based on the measured amount of HC and whether the operating condition is detected, control at least one of the purge pump and a purge valve to deliver the desired amount of fuel vapor to the engine, the purge valve being connected between the purge pump and the engine.
1 Assignment
0 Petitions
Accused Products
Abstract
An evaporative emissions (EVAP) control system for a vehicle includes a purge pump configured to pump fuel vapor trapped in a vapor canister to an engine of the vehicle via a vapor line when engine vacuum is less than an appropriate level for delivering fuel vapor to the engine, the fuel vapor resulting from evaporation of a liquid fuel stored in a fuel tank of the engine. The EVAP control system includes a hydrocarbon (HC) sensor disposed in the vapor line and configured to measure an amount of HC in the fuel vapor pumped by the purge pump to the engine via the vapor line. The EVAP control system also includes a controller configured to, based on the measured amount of HC, control at least one of the purge pump and a purge valve to deliver a desired amount of fuel vapor to the engine.
-
Citations
15 Claims
-
1. An evaporative emissions (EVAP) control system for a vehicle, the EVAP control system comprising:
-
a purge pump configured to pump fuel vapor trapped in a vapor canister to an engine of the vehicle via a vapor line, the fuel vapor resulting from evaporation of a liquid fuel stored in a fuel tank of the engine; a hydrocarbon (HC) sensor disposed in the vapor line and configured to measure an amount of HC in the fuel vapor pumped by the purge pump to the engine via the vapor line; and a controller configured to (i) determine a desired amount of fuel vapor to deliver to the engine; (ii) detect an operating condition of the engine where engine vacuum is less than an appropriate level for delivering the desired amount of fuel vapor to the engine without using the purge pump; and (iii) based on the measured amount of HC and whether the operating condition is detected, control at least one of the purge pump and a purge valve to deliver the desired amount of fuel vapor to the engine, the purge valve being connected between the purge pump and the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification