Evaporated fuel treatment device
AssigneeAisan Kogyo Kabushiki Kaisha
InventorsDaisaku Asanuma, Nobuhiro Kato
Life of this patent
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Abstract
An evaporated fuel processing device may comprise a canister, a control valve disposed on a purge passage and switching between a closed state being a state of closing the purge passage and an open state being a state of opening the purge passage, a pump disposed between the canister and the control valve, an acquiring unit acquiring a characteristic value related to a characteristic of the pump in a situation where the control valve is in the closed state and the pump pressurizes gas in the purge passage on a control valve side relative to the pump, and an estimating unit estimating a flow rate of the gas that the pump discharges to the purge passage on the control valve side when the control valve is in the open state, by using the acquired characteristic value.
Claims13
An evaporated fuel processing device comprising:
- a canister configured to store evaporated fuel;
- a control valve disposed on a purge passage communicating the canister and an intake passage of an engine and configured to switch between a closed state and an open state, the closed state being a state of closing the purge passage, and the open state being a state of opening the purge passage;
- a pump disposed on the purge passage between the canister and the control valve;
- an acquiring unit configured to acquire a characteristic value related to a characteristic of the pump in a situation where the control valve is in the closed state and the pump pressurizes gas in the purge passage on a control valve side relative to the pump;
- and
- an estimating unit configured to estimate a flow rate of the gas that the pump discharges to the purge passage on the control valve side when the control valve is in the open state, by using the acquired characteristic value.
An evaporated fuel processing device comprising:
- a canister configured to store evaporated fuel;
- a control valve disposed on a purge passage communicating the canister and an intake passage of an engine and configured to switch between a closed state and an open state, the closed state being a state of closing the purge passage and the open state being a state of opening the purge passage;
- a pump disposed on the purge passage between the canister and the control valve;
- an acquiring unit configured to acquire a pressure difference between a pressure in the purge passage on a control valve side of the pump and a pressure in the purge passage on a canister side of the pump in a situation where the control valve is in the closed state and the pump pressurizes gas in the purge passage on the control valve side;
- and
- an adjusting unit configured to adjust a flow rate of the gas that the pump discharges to the purge passage on the control valve side in a situation where the control valve is in the open state, by using the acquired pressure difference.
Dependencies are inferred from the claim text.