Leakage diagnosis device and leakage diagnosis method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKeita Fukui, Ryo Kondo, Yoshihisa Oda
Life of this patent
Estimating the term…
Abstract
The leakage diagnosis that carries out a leakage diagnosis on the basis of an internal pressure state of an airtight compartment by emitting gas from the compartment via a canister during a stop of the internal combustion engine includes; detecting a physical quantity that reflects a fuel adsorption state of the canister; and repeating the leakage diagnosis within the number of times of the leakage diagnosis, limited on the basis of the detected physical quantity. The compartment is formed in an evaporative fuel processing mechanism for an internal combustion engine. The evaporative fuel processing mechanism includes a fuel tank.
Claims20
A leakage diagnosis device that carries out a leakage diagnosis on the basis of an internal pressure state of an airtight compartment by emitting gas from the compartment via a canister during a stop of an internal combustion engine, the compartment being formed in an evaporative fuel processing mechanism for the internal combustion engine, the evaporative fuel processing mechanism including a fuel tank, and the leakage diagnosis device comprising:
- a detecting unit that detects a physical quantity that reflects a fuel adsorption state of the canister;
- and
- a leakage diagnosis repeating unit that repeats the leakage diagnosis within the number of times of the leakage diagnosis, limited on the basis of the detected physical quantity.
A leakage diagnosis method that carries out a leakage diagnosis on the basis of an internal pressure state of an airtight compartment by emitting gas from the compartment via a canister during a stop of the internal combustion engine, the compartment being formed in an evaporative fuel processing mechanism for an internal combustion engine, the evaporative fuel processing mechanism including a fuel tank, and the leakage diagnosis method comprising:
- detecting a physical quantity that reflects a fuel adsorption state of the canister;
- and
- repeating the leakage diagnosis within the number of times of the leakage diagnosis, limited on the basis of the detected physical quantity.
Dependencies are inferred from the claim text.