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US 2026/0071598 A1Published application
Method and system for diagnosing evaporative emissions control system
AssigneeFord Global Technologies, LLC
InventorsAed Dudar, Scott Bohr, Sangbum Hong
Life of this patent
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Abstract
Methods and systems are presented for diagnosing operation of an evaporative emissions system that included two carbon filled fuel vapor storage canisters that are arranged in parallel. In one example, operation of a first canister vent valve, a second canister vent valve, and a canister purge valve are adjusted to diagnose breaches and obstructions within the evaporative emissions system.
Claims20
A method for operating an evaporative emissions system of a vehicle, comprising:
- operating a canister purge valve and two canister vent valves that are arranged in parallel during a diagnostic sequence to diagnose the two canister vent valves and two canister vent lines that couple the two canister vent valves;
- and
- generating an indication of evaporative emissions degradation in response to output of a pressure sensor generated during the diagnostic sequence.
An evaporative emissions system, comprising:
- a first carbon filled fuel vapor storage canister arranged in parallel with a second carbon filled fuel vapor storage canister;
- a fuel tank;
- a pressure sensor;
- a canister purge valve;
- a first canister vent valve and a second canister vent valve;
- a first canister vent line coupled directly to the first canister vent valve and directly to a second canister vent line, the second canister vent line also coupled directly to the second canister vent valve, the first canister vent line coupled directly to the second canister vent line;
- a first canister load line coupled directly to the first carbon filled fuel vapor storage canister, the first carbon filled fuel vapor storage canister also coupled directly to a second canister load line, the second canister load line also directly coupled to the second carbon filled fuel vapor storage canister;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to perform an evaporative emissions system diagnostic that includes a second phase where the first canister vent valve is evaluated for being stuck open, the second canister vent valve is evaluated for being stuck open, the second canister vent valve is evaluated for being stuck closed, the second canister vent line and the second canister load line are evaluated for being plugged.
6 more elements
A method for operating an evaporative emissions system of a vehicle, comprising:
- commanding open a first canister vent valve, a second canister vent valve, and a canister purge valve during an initial phase of an evaporative emissions system diagnostic, where the first canister vent valve is arranged in parallel with the second canister vent valve;
- commanding closed the second canister vent valve, commanding open the first canister vent valve and the canister purge valve during a first phase of the evaporative emissions system diagnostic;
- commanding closed the first canister vent valve, commanding open the second canister vent valve and the canister purge valve during a second phase of the evaporative emissions system diagnostic;
- and
- commanding closed the first canister vent valve and the second canister vent valve, and commanding open the canister purge valve during a third phase of the evaporative emissions system diagnostic.
2 more elements
Dependencies are inferred from the claim text.