Evaporated fuel processing device
First Claim
1. An evaporated fuel processing device comprising:
- a canister including an adsorbent material that adsorbs evaporated fuel generated in a fuel tank;
a vapor passage configured to connect the canister and the fuel tank;
a purge passage configured to connect the canister and an intake passage of an engine;
a shutoff valve provided in the vapor passage, and configured to adjust flow rate of gas flowing through the vapor passage;
a storage device configured to store in advance a reference value for the shutoff valve corresponding to an internal pressure of the fuel tank; and
a control device configured to perform a pressure release control by controlling the shutoff valve based on the reference value which is obtained from the internal pressure of the fuel tank,wherein the shutoff valve includes a valve seat, and a movable valve configured to move in an axial direction with respect to the valve seat, and wherein the reference value for the shutoff valve is a reference stroke amount, which is a movement amount of the movable valve;
wherein the control device is configured to determine whether or not a reduction amount in the internal pressure of the fuel tank within a prescribed time is smaller than a predetermined value;
wherein the control device is configured to control the shutoff valve based on an addition value obtained through addition of a correction value to the reference value when the reduction in the internal pressure of the fuel tank is smaller than the predetermined value;
wherein the control device is configured to determine whether or not the reduction amount of the internal pressure of the fuel tank within the prescribed time is larger than or equal to the predetermined value in a state in which the shutoff valve is being controlled based on the addition value;
wherein the control device is configured to control the shutoff valve based on the reference value in a case where the reduction amount of the internal pressure of the fuel tank is greater than or equal to the predetermined value;
wherein the control device is configured so as to obtain the reduction amount of the internal pressure of the fuel tank by detecting the internal pressure of the fuel tank every predetermined period of time to compute a pressure difference between a previous detection pressure and a current detection pressure;
wherein the control device is configured to control the shutoff valve based on the reference value in a case where the pressure difference is greater than or equal to a predetermined value; and
wherein the control device is configured to control the shutoff valve based on the addition value in a case where the pressure difference is less than the redetermined value.
1 Assignment
0 Petitions
Accused Products
Abstract
An evaporated fuel processing device has a canister, a vapor passage, a purge passage, a shutoff valve, a storage device and a control device. The canister includes an adsorbent material that adsorbs evaporated fuel generated in a fuel tank. The vapor passage connects the canister and the fuel tank. The purge passage connects the canister and an intake passage of an engine. The shutoff valve is provided in the vapor passage, and adjusts flow rate of gas flowing through the vapor passage. The storage device stores in advance a reference value for the shutoff valve corresponding to internal pressure of the fuel tank. The shutoff valve is controlled based on the reference value, which is obtained from the internal pressure of the fuel tank, and pressure release control is performed on the fuel tank.
11 Citations
8 Claims
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1. An evaporated fuel processing device comprising:
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a canister including an adsorbent material that adsorbs evaporated fuel generated in a fuel tank; a vapor passage configured to connect the canister and the fuel tank; a purge passage configured to connect the canister and an intake passage of an engine; a shutoff valve provided in the vapor passage, and configured to adjust flow rate of gas flowing through the vapor passage; a storage device configured to store in advance a reference value for the shutoff valve corresponding to an internal pressure of the fuel tank; and a control device configured to perform a pressure release control by controlling the shutoff valve based on the reference value which is obtained from the internal pressure of the fuel tank, wherein the shutoff valve includes a valve seat, and a movable valve configured to move in an axial direction with respect to the valve seat, and wherein the reference value for the shutoff valve is a reference stroke amount, which is a movement amount of the movable valve; wherein the control device is configured to determine whether or not a reduction amount in the internal pressure of the fuel tank within a prescribed time is smaller than a predetermined value; wherein the control device is configured to control the shutoff valve based on an addition value obtained through addition of a correction value to the reference value when the reduction in the internal pressure of the fuel tank is smaller than the predetermined value; wherein the control device is configured to determine whether or not the reduction amount of the internal pressure of the fuel tank within the prescribed time is larger than or equal to the predetermined value in a state in which the shutoff valve is being controlled based on the addition value; wherein the control device is configured to control the shutoff valve based on the reference value in a case where the reduction amount of the internal pressure of the fuel tank is greater than or equal to the predetermined value; wherein the control device is configured so as to obtain the reduction amount of the internal pressure of the fuel tank by detecting the internal pressure of the fuel tank every predetermined period of time to compute a pressure difference between a previous detection pressure and a current detection pressure; wherein the control device is configured to control the shutoff valve based on the reference value in a case where the pressure difference is greater than or equal to a predetermined value; and wherein the control device is configured to control the shutoff valve based on the addition value in a case where the pressure difference is less than the redetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification