Fuel vapor treatment apparatus
AssigneeNissan Motor Co., Ltd.
InventorMasaya Furushou
Life of this patent
Estimating the term…
Abstract
A fuel vapor treatment apparatus for an internal combustion engine is configured to improve the purge control performance of a purge control valve. The fuel vapor treatment apparatus includes a purge control valve, an operating condition detector, a purge gas flow rate setting component and a control unit. The control unit outputs a duty value and a drive frequency to the purge control valve to duty control the opening and closing of the purge control valve when prescribed operating conditions are met. The control unit sets a high drive frequency used for duty control of the purge control valve during a low flow rate control of the purge gas and to a low drive frequency during a high flow rate control of the purge gas.
Claims12
A fuel vapor treatment apparatus for an internal combustion engine comprising:
- a purge control valve configured to open and close a purge passage that introduces purge gas containing fuel vapor into an air intake system of the engine to control a purge gas flow rate of the purge gas;
- an operating condition detector configured to detect at least one engine operating condition;
- a purge gas flow rate setting component configured to set the purge gas flow rate of the purge gas quantity to be supplied to the air intake system based on the engine operating condition detected by the operating condition detector;
- and
- a control unit configured to output a duty value and a drive frequency to the purge control valve to duty control the opening and closing of the purge control valve, the control unit setting a high drive frequency during a low flow rate control of the purge gas and setting a low drive frequency during a high flow rate control of the purge gas.
A fuel vapor treatment apparatus for an internal combustion engine comprising:
- purge passage open/close means for opening and closing a purge passage that introduces purge gas containing fuel vapor into an air intake system of the engine to control a purge gas flow rate of the purge gas;
- operating condition detection means for detecting at least one engine operating condition;
- purge gas flow rate setting means for setting the purge gas flow rate of the purge gas quantity to be supplied to the air intake system based on the engine operating condition detected by the operating condition detection means;
- a control means for outputting a duty value and a drive frequency to the purge passage open/close means to duty control the opening and closing of the purge passage open/close means, the control means setting a high drive frequency during a low flow rate control of the purge gas and setting a low drive frequency during a high flow rate control of the purge gas.
A method of treating fuel vapor an internal combustion engine comprising:
- detecting at least one engine operating condition;
- setting a purge gas flow rate of a purge gas quantity to be supplied to an air intake system of the engine by a purge passage that introduces purge gas containing fuel vapor into the air intake system to based on the engine operating;
- determining a duty value for opening and closing duty of the purge passage based on the purge gas flow rate;
- setting a drive frequency of opening and closing of the purge passage based on the purge gas flow rate such that a high drive frequency is set during a low flow rate control of the purge gas and a low drive frequency is set during a high flow rate control of the purge gas;
- and
- opening and closing the purge passage based on the duty value and the drive frequency.
Dependencies are inferred from the claim text.