Canister capacity diagnostics for evaporative emissions control system in heavy duty vehicles
US11585298B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2022 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Feb 9, 2042 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0854
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for an evaporative emissions control system for onboard refueling vapor recovery of a heavy duty vehicle. In one example, a method may include, in response to greater than a threshold change in a fuel level of a fuel tank fluidically coupled to at least two fuel vapor storage canisters of an evaporative emissions control system during a refueling event, performing a canister working capacity diagnostic on each of the at least two fuel vapor storage canisters by measuring an exhaust gas air-fuel ratio (AFR) while independently purging each of the at least two fuel vapor storage canisters. In this way, the working capacity of each fuel vapor storage canister may be separately assessed in order to more accurate identify degradation of the working capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.