PCSV CONTROL METHOD FOR PREVENTING MALFUNCTION

Abstract

A Purge Control Solenoid Valve (PCSV) control method for preventing malfunction may include: starting-up by a starting motor a crankshaft of an engine, and opening PCSV by a duty-control, wherein in the starting-up step, the PCSV is opened to eliminate foreign substances stained on the PCSV.

Claims

1. A Purge Control Solenoid Valve (PCSV) control method for preventing malfunction, the method comprising: starting-up, by a starting motor, a rotation of a crankshaft of an engine, and opening the PCSV by a duty-control, wherein the PCSV is opened to eliminate foreign substances stained on the PCSV.

2. The PCSV control method of claim 1, wherein in the starting-up, when a temperature of coolant of the engine or a temperature of a region where a vehicle is located is smaller than an appropriate value, or exceeds a threshold, the PCSV is duty-controlled to be closed.

3. The PCSV control method of claim 1, wherein in the starting-up, when an operating time point of the starting motor from a time point when the rotation of the crankshaft has been stopped is smaller than a specific time, the PCSV is duty-controlled to be closed.

4. The PCSV control method of claim 1, wherein in the starting-up, the PCSV maintains the opened state for a certain time from a rotation starting time point of the crankshaft.

5. The PCSV control method of claim 4, wherein the certain time is shorter than a time between the rotation starting time point of the crankshaft and a time point when the engine is started-up and then revolutions per minute (RPM) of the engine is stabilized.

6. The PCSV control method of claim 1, wherein in the starting-up, the PCSV is duty-controlled to become a predetermined opening amount.

7. The PCSV control method of claim 1, further comprising: stopping the engine and controlling the PCSV to be opened and closed with a cycle via the duty-control, wherein in stopping the engine, the PCSV is controlled to repeat the opening and closing with the cycle so as to eliminate a negative pressure between the PCSV and an intake pipe of the engine.

8. The PCSV control method of claim 7, wherein a compressor for compressing an intake air is mounted on the intake pipe, wherein a check valve for preventing the intake air from flowing into the PCSV from the intake pipe is mounted between the PCSV and the intake pipe, and wherein in stopping the engine, while repeating opening and closing the PCSV with the cycle, a negative pressure between the check valve and the PCSV becomes equal to an atmospheric pressure.

9. The PCSV control method of claim 7, wherein in stopping the engine, the PCSV is duty-controlled to be opened and closed at least once with any cycle from a time point when the rotation of the crankshaft has been stopped.

10. The PCSV control method of claim 7, wherein in stopping the engine, the PCSV is duty-controlled to be opened and closed at least once with any cycle from a time point when the rotation of the crankshaft has been stopped and a specific time has elapsed.

11. The PCSV control method of claim 9, wherein in stopping the engine, a time that maintains an opened state and a closed state while the PCSV is opened and closed with any cycle is 0.

12. The PCSV control method of claim 10, wherein in stopping the engine, a time that maintains an opened state and a closed state while the PCSV is opened and closed with any cycle is 0.

13. The PCSV control method of claim 7, wherein in stopping the engine, the PCSV is duty-controlled to be opened and closed with the cycle after the engine is started off and any time has elapsed.

14. A control unit including a processor configured to operate the PCSV according to the PCSV control method of claim 1.

Description

DRAWINGS

[0028] In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which:

[0029] FIG. 1 is a flowchart of a PCSV control method for preventing malfunction in one form of the present disclosure;

[0030] FIG. 2 is a graph illustrating the starting-up of FIG. 1;

[0031] FIGS. 3 and 4 are graphs illustrating the stopping of FIG. 1; and

[0032] FIG. 5 is an exemplary diagram of a system to which the PCSV control method for preventing malfunction of FIG. 1 is applied.

[0033] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

DETAILED DESCRIPTION

[0034] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0035] Hereinafter, a PCSV control method for preventing malfunction in one form of the present disclosure will be described with reference to the accompanying drawings.

[0036] As illustrated in FIGS. 1 to 5, a PCSV control method for preventing malfunction according to an exemplary form of the present disclosure includes: starting-up in which a crankshaft C is rotated by an operation of a starting motor S, and a Purge Control Solenoid Valve (PCSV) 100 is duty-controlled to be opened S100, and stopping an engine in which the engine is started off, and the PCSV 100 is duty-controlled to be opened and closed with a cycle S200, and in the starting-up S100, the PCSV 100 is opened to eliminate the foreign substances stained on the PCSV 100, and in the stopping S200, the PCSV 100 is opened and closed to have a cycle to eliminate the negative pressure between the PCSV 100 and an intake pipe I.

[0037] In the starting-up S100, as the PCSV 100 is opened and closed, the foreign substances that are condensed or hardened and fixed on the surface of the PCSV 100, or are phase-converted into ice are separated from the surface of the PCSV 100. The foreign substances are separated from the surface of the PCSV 100, thereby inhibiting or preventing the fixing of the PCSV 100 caused by the foreign substances, and preventing the malfunction or non-operation of the PCSV 100.

[0038] In the starting-up S100, the non-operation condition is substituted to restrict the operation of the PCSV 100 in the starting-up S100. The non-operation condition includes a temperature of coolant, the temperature of the outside air, and the stopping time. In the starting-up S100, when the temperature of the coolant of an engine E having a crankshaft C or the temperature of the region where a vehicle having the engine E is located is smaller than 5.25 C., or exceeds 20 C., the PCSV 100 is duty-controlled to maintain the closed state without opening. In the starting-up S100, when the stopping time that is the operating time point of the starting motor S from the time point when the rotation of the crankshaft C has been stopped is smaller than 2 hours, the PCSV 100 is duty-controlled to be closed without opening.

[0039] In the starting-up S100, the PCSV 100 is duty-controlled so that a current is applied thereto to have the opening amount of 80% to 100%. In the starting-up S100, the PCSV 100 is controlled to maintain the opened state for a specific time from the rotation starting time point of the crankshaft C. As illustrated in FIG. 2, in the starting-up S100, the PCSV 100 is controlled to be opened for 0.4 to 0.6 seconds from the rotation starting time point of the crankshaft C.

[0040] As illustrated in FIG. 5, a system to which the PCSV 100 control method for preventing malfunction in one form of the present disclosure is applied includes: a canister 300 for absorbing the evaporated gas evaporated in a fuel tank 400, a purge line 500 for connecting the fuel tank 400, the canister 300, and the intake pipe I, the PCSV 100 mounted on the purge line 500, a check valve 200 mounted on the purge line 500 to be interposed between the intake pipe I and the PCSV 100, and a compressor P mounted on the intake pipe I to compress the intake air. The check valve 200 prevents the intake air from flowing into the PCSV 100 and the rear end of the PCSV 100 from the intake pipe I. The check valve 200 is mounted on the purge line 500 so that the evaporated gas flows only toward the intake pipe I from the PCSV 100.

[0041] When an operation of the compressor P is stopped as the engine E is started off, the air that has been compressed in the intake pipe I flows backward through the intake pipe I to be discharged to the outside. Therefore, a negative pressure is generated in the intake pipe I. The air between the check valve 200 and the PCSV 100 flows into the intake pipe I by the negative pressure generated in the intake pipe I. As a result, the negative pressure is generated between the check valve 200 and the PCSV 100.

[0042] In the stopping S200, the PCSV 100 is opened and closed to have a cycle, such that the outside air through a vent valve connected to the canister 300 is supplied between the check valve 200 and the PCSV 100 through the purge line 500. As a result, the pressure between the check valve 200 and the PCSV 100 is changed from the negative pressure to the atmospheric pressure. In the stopping S200, the PCSV 100 is duty-controlled to be opened and closed with a cycle.

[0043] According to one example, in the stopping S200, the PCSV 100 is opened and closed to have a cycle after the engine is started off and the rotation of the crankshaft C has been stopped. As illustrated in FIG. 3, in the stopping S200, the PCSV 100 is duty-controlled to be opened and closed at least once every 0.2 second cycle from the time point when the rotation of the crankshaft C has been stopped and one second has elapsed. The PCSV 100 can also be opened and closed once. In the stopping S200, the time that maintains the opened state and the closed state while the PCSV 100 is opened and closed with a cycle can be 0.

[0044] According to another example, as illustrated in FIG. 4, in the stopping S200, the PCSV 100 can also be duty-controlled to be opened and closed at least once every 0.41 second cycle from the time point when the rotation of the crankshaft C has been stopped and three seconds have elapsed. In this case, the PCSV 100 can be opened and closed five times or more. In the stopping S200, the time that maintains the opened state and the closed state while the PCSV 100 is opened and closed with a cycle can be 0.

[0045] The PCSV 100 control method for preventing malfunction in one form of the present disclosure configured as described above is provided in a state stored in a control unit 600 illustrated in FIG. 5. The control unit 600 controls the operation of the PCSV 100 according to the PCSV 100 control method for preventing malfunction.

[0046] According to the PCSV control method as described above, in the starting-up S100, it is possible for the PCSV 100 to be opened and closed to eliminate the foreign substances stained on the surface of the PCSV 100 while stopping, thereby preventing the malfunction or non-operation of the PCSV 100 caused by the foreign substances fixed to the surface of the PCSV 100 upon stopping.

[0047] In addition, in the stopping S200, it is possible for the PCSV 100 to be opened and closed to have a cycle to eliminate the negative pressure between the PCSV 100 and the intake pipe I, and thereby to allow the negative pressure generated inside the line for connecting the check valve 200 and the PCSV 100 to operate on the airtight portion of the PCSV 100, thereby preventing the foreign substances from being absorbed more strongly.

[0048] In addition, in the starting-up S100 and the in the stopping S200, it is possible to operate the PCSV 100 for a short time, thereby generating less noise.