FUEL VAPOR PROCESSING APPARATUS
First Claim
1. A fuel vapor processing apparatus comprising:
- a canister configured to be capable of adsorbing fuel vapor produced in a fuel tank;
a closing valve provided in a vapor passage connecting the canister and the fuel tank, the closing valve comprising a movable valve member and an actuator coupled to the movable valve member;
wherein the closing valve is closed when a stroke distance of the movable valve member with respect to a reference position is between zero and a valve open start position, and the closing valve is opened when the stroke distance of the movable member exceeds the valve open start position; and
a control device coupled to the actuator and configured to perform a learning control, in which the valve opening start position is learned based on the stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value from a reference pressure value while the moving distance of the movable valve member is changed such that;
(a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction; and
(b) the movable valve member moves further from the learning start position in the valve opening direction at a second speed;
wherein the second speed is lower than the first speed.
1 Assignment
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Accused Products
Abstract
A fuel vapor processing apparatus may include a canister, a closing valve provided in a vapor passage connecting the canister and the fuel tank, an actuator coupled to the movable valve member, and a control device coupled to the actuator. The control device may perform a learning control, in which a valve opening start position is learned based on a stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value while the moving distance of the movable valve member is changed such that (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction and (b) the movable valve member moves further from the learning start position at a second speed in the valve opening direction.
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Citations
23 Claims
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1. A fuel vapor processing apparatus comprising:
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a canister configured to be capable of adsorbing fuel vapor produced in a fuel tank; a closing valve provided in a vapor passage connecting the canister and the fuel tank, the closing valve comprising a movable valve member and an actuator coupled to the movable valve member; wherein the closing valve is closed when a stroke distance of the movable valve member with respect to a reference position is between zero and a valve open start position, and the closing valve is opened when the stroke distance of the movable member exceeds the valve open start position; and a control device coupled to the actuator and configured to perform a learning control, in which the valve opening start position is learned based on the stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value from a reference pressure value while the moving distance of the movable valve member is changed such that; (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction; and (b) the movable valve member moves further from the learning start position in the valve opening direction at a second speed; wherein the second speed is lower than the first speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel vapor processing apparatus comprising:
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a canister configured to be capable of adsorbing fuel vapor produced in a fuel tank; a closing valve provided in a vapor passage connecting the canister and the fuel tank, the closing valve comprising a movable valve member and an actuator coupled to the movable valve member; wherein the closing valve is closed when a stroke distance of the movable valve member with respect to a reference position is between zero and a valve open start position, and the closing valve is opened when the stroke distance of the movable member exceeds the valve open start position; and a control device coupled to the actuator and configured to perform a learning control, in which the valve opening start position is learned based on the stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value from a reference pressure value while the moving distance of the movable valve member is changed such that; the movable valve member moves from a learning start position in the valve opening direction; wherein the learning start position is a position where the stroke distance of the movable valve member is smaller than a reference learning value by a predetermined control value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A fuel vapor control device, comprising:
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memory containing a control program; and a processor coupled to the memory and configured to execute the control program; wherein, upon executing the control program the processor is to; perform a learning control, in which an opening start position of a closing valve is learned based on a signal representing a stroke distance of a movable valve member of a closing valve at the time when an internal pressure of a fuel tank is reduced by a predetermined pressure value from a reference pressure value while a moving distance of the movable valve member is changed such that; (a) the processor causes the movable valve member to move from the reference position to a learning start position at a first speed in a valve opening direction; and (b) the processor causes the movable valve member to move further from the learning start position in the valve opening direction at a second speed; wherein the second speed is lower than the first speed
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23. A fuel vapor control device, comprising:
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memory containing a control program; and a processor coupled to the memory and configured to execute the control program; wherein, upon executing the control program the processor is to; perform a learning control, in which an opening start position of a closing valve is learned based on a signal representing a stroke distance of a movable valve member of a closing valve at the time when an internal pressure of a fuel tank is reduced by a predetermined pressure value from a reference pressure value while a moving distance of the movable valve member is changed such that the processor causes the movable valve member to move from a learning start position in a valve opening direction; wherein the learning start position is a position where the stroke distance of the movable valve member is smaller than a reference learning value by a predetermined control value.
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Specification