PCSV control method to prevent malfunction

Abstract

Purge control solenoid valve (PCSV) control method for preventing malfunction, wherein the method comprises: Starting (S100), by means of a starter motor (S), a rotation of a crankshaft (C) of an internal combustion engine (E), Opening a flushing control solenoid valve (PCSV) (100) by means of a duty cycle control to eliminate foreign substances that are deposited on the PCSV (100), and Stopping (S200) the internal combustion engine (E) and controlling the PCSV (100) to be opened and closed with one cycle via a duty cycle control, wherein the PCSV (100) is controlled when the internal combustion engine (E) stops (S200) to repeat the opening and closing cycle to eliminate a vacuum between the PCSV (100) and the intake manifold (I) of the internal combustion engine (E).

Description

AREA OF INVENTION

[0001] The present invention relates to a flushing control solenoid valve (PCSV) control method (e.g. a venting control solenoid valve control method) for inhibiting or preventing a malfunction. BACKGROUND OF THE INVENTION

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Vaporized gasoline is produced in a fuel tank due to changes in pressure and temperature. If more evaporated gasoline accumulates than necessary, the internal pressure of the fuel tank can become excessively high. As the internal pressure of the fuel tank increases, the fuel tank can be damaged, or the evaporated gasoline can escape from the fuel tank.

[0004] Therefore, a container holding activated carbon is connected to the fuel tank to absorb the vaporized gasoline. The vaporized gasoline, absorbed by the activated carbon, flows into an intake manifold and is burned in a combustion chamber. A PCSV (Power Supply Valve) is installed between the container and the intake manifold. As soon as the PCSV opens, the vacuum created in the intake manifold acts on the container, and the vaporized gasoline absorbed by the activated carbon flows into the intake manifold by means of this vacuum.

[0005] Meanwhile, a compressor can be mounted on the intake line to compress the intake air. In this case, since the intake air is compressed by the compressor, the internal pressure of the intake line will be equal to or greater than atmospheric pressure. A check valve (e.g., a non-return valve) is installed between the intake line and the PCSV to prevent the intake air from flowing from the intake line towards the tank.

[0006] However, we have found that it is likely that the foreign substances adhering to the PCSV are phase-changed into a liquid by the heat generated in the combustion engine during operation. After operation, the foreign substances in the liquid phase may have condensed into water droplets or may have solidified and adhered to the surface of the PCSV. In particular, if the temperature difference between the surfaces of the PCSV before and after operation is large, foreign substances in the liquid phase on the surface of the PCSV may also be transformed into ice. The foreign substances that have condensed or adhered to the surface of the PCSV, or that have phase-changed into ice, can lock the PCSV in its state, thereby causing a malfunction, inactivity, or failure to operate.

[0007] Additionally, we discovered that when a vehicle (e.g., a motor vehicle) is stopped, in which the compressor is mounted on the intake manifold, the interior of the line connecting the shut-off valve and the PCSV (Power Supply Valve) experiences a vacuum. This vacuum is created by fluctuations in the intake manifold's internal pressure due to the compressor stopping, the directional nature of the shut-off valve, and the PCSV not being in operation or actuated. The vacuum generated within the line connecting the shut-off valve and the PCSV causes foreign substances to be more readily absorbed by the airtight section of the PCSV.

[0008] For example, DE 10 2005 041 758 A1 discloses a purging control solenoid valve control method (PCSV control method) for preventing a malfunction, wherein the method comprises: starting, by means of a starter, a rotation of a crankshaft of an internal combustion engine, and opening a purging control solenoid valve.

[0009] Furthermore, for example, a method for eliminating substances at a throttle valve is known from US 7 503 311 B2, and a method for tank venting with pulse width modulated valve actuation is known from KR 10 2002 0 055 045 A. EXPLANATION OF THE INVENTION

[0010] According to the invention, a PCSV control method with the features of claim 1 and a control unit for carrying out the PCSV control method with the features of claim 10 are provided. Further embodiments of the PCSV control method are described in the dependent claims. That is to say, the present invention provides a PCSV control method (e.g., a purge control solenoid valve control method, e.g., a vent control solenoid valve control method) for preventing a malfunction, which inhibits or prevents the malfunction or non-operation of a PCSV (e.g., a purge control solenoid valve, e.g., a vent control solenoid valve) due to foreign substances that are adhering to (e.g., fixed to) a surface of the PCSV, resulting in (e.g., upon) a stop.

[0011] Additionally, the present invention provides a PCSV control method (e.g. a purge control solenoid valve control method, e.g. a vent control solenoid valve control method) for preventing a malfunction which can eliminate a (e.g. the) negative pressure that is generated / is generated within the line for connecting a check valve and a PCSV (e.g. a purge control solenoid valve, e.g. a vent control solenoid valve) upon (e.g. a) stopping of an internal combustion engine.

[0012] Thus, a purge control solenoid valve (PCSV) control method (e.g., a vent control solenoid valve control method) to prevent malfunction includes: starting (e.g., starting) by means of a starter motor, rotation of a crankshaft of an internal combustion engine; opening of a purge control solenoid valve (PCSV) (e.g., a vent control solenoid valve) by means of a duty cycle control to eliminate foreign substances that are deposited on the PCSV; stopping of the internal combustion engine and controlling the PCSV to be opened and closed with a cycle via a duty cycle control, whereby the PCSV is controlled when the internal combustion engine is stopped to repeat the opening and closing with the cycle to eliminate a vacuum between the PCSV and the intake manifold of the internal combustion engine.

[0013] Additionally, during startup, if the temperature of an internal combustion engine coolant or the temperature of an area (e.g., a region, an area) where a vehicle (e.g., a motor vehicle) is located is less than a suitable value or exceeds a threshold, the PCSV duty cycle controlled to close.

[0014] Additionally, during starting, if the starter's operating time is less than a specific time from when the crankshaft rotation was stopped, the PCSV duty cycle can be controlled to close.

[0015] Additionally, the PCSV can maintain the open state for a certain period of time from the crankshaft's rotation start point during startup.

[0016] Additionally, the specified time can be shorter than the time between the start of rotation of the crankshaft and the time when the internal combustion engine is started (e.g., running) and the RPM (e.g., revolutions per minute) of the internal combustion engine are stabilized.

[0017] Additionally, the PCSV can be duty cycle controlled during startup to achieve a predetermined opening amount (e.g., a predetermined opening degree).

[0018] Additionally, a compressor can be mounted on the intake manifold to compress the intake air, and a check valve can be installed between the PCSV and the intake manifold to prevent intake air from flowing into the PCSV. Specifically, when the combustion engine stops, and the PCSV repeatedly opens and closes during the cycle, the vacuum between the check valve and the PCSV can become at atmospheric pressure.

[0019] Additionally, the PCSV can be duty-rate controlled when the internal combustion engine is stopped, so that it opens and closes at least once with some cycle from a point in time when the rotation of the crankshaft was stopped.

[0020] Additionally, the PCSV can be duty-rate controlled when the internal combustion engine is stopped, so that it opens and closes at least once with any cycle from the time when the rotation of the crankshaft was stopped and a specific time has elapsed.

[0021] Additionally, the time when the combustion engine stops can be 0, maintaining the open and closed states while the PCSV is being opened and closed with any cycle.

[0022] Additionally, the PCSV can be duty-rate controlled when the internal combustion engine stops, to open and close with a cycle after the internal combustion engine has been started (e.g., started) and some time has elapsed.

[0023] The present invention further provides a control unit (e.g., a control device) for operating the PCSV according to the PCSV control method to prevent malfunctions. The control unit can perform at least one function or operation and can be implemented in a hardware manner (e.g., as a processor), in a software manner, or a combination of both, which implement the PCSV control method described in detail below.

[0024] According to the PCSV control method for inhibiting or preventing a malfunction in an exemplary embodiment of the present invention, which is configured as described above, it is possible for the PCSV to open and close during startup in order to eliminate the foreign substances that are deposited on the surface of the PCSV during a stop, thereby inhibiting or preventing the malfunction or non-operation of the PCSV caused by the foreign substances that are adhering to (e.g. fixed to) the surface of the PCSV during a stop.

[0025] Additionally, when the PCSV stops, it is possible to open and close in order to cycle, eliminating the negative pressure between the PCSV and the intake line, and thereby allowing the negative pressure generated within the line connecting the check valve and the PCSV to act on the airtight section of the PCSV, thus preventing the foreign substances from being absorbed more extensively.

[0026] Additionally, it is possible to operate the PCSV for a short time during starting and stopping, which reduces noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To ensure a clear understanding of the invention, various embodiments thereof will now be described and presented by way of example, with reference to the accompanying drawings, which: Fig. 1. A flowchart of a PCSV control method (e.g., a purge control solenoid valve control method, e.g., a vent control solenoid valve control method) to prevent a malfunction is provided in one embodiment of the present invention. Fig. 2 is a graph that shows the starting of Fig. 1 represents, Fig. 3 and Fig. There are 4 graphs that show the stopping of Fig. 1 each represent, and Fig. 5 is an exemplary diagram of a system in which the PCSV control method is used to prevent a malfunction of Fig. 1 is used or deployed.

[0028] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. DETAILED DESCRIPTION

[0029] A PCSV control method (e.g. a flushing control solenoid valve control method, e.g. a venting control solenoid valve control method) for preventing a malfunction in an embodiment of the present invention is described below with reference to the accompanying drawings.

[0030] As in Fig. Figures 1 to 5 show a PCSV control method (e.g., a purge control solenoid valve control method, e.g., a vent control solenoid valve control method) for preventing a malfunction according to an exemplary embodiment of the present invention: Starting (e.g., starting), in / during which a crankshaft C is rotated by means of operation of a starter S and in / during which a purge control solenoid valve (PCSV) 100 (e.g.,a vent control solenoid valve) duty cycle controlled to be opened S100, and stopping an internal combustion engine, in which the internal combustion engine is stopped and the PCSV 100 duty cycle controlled to be opened and closed with a cycle S200, and at starting S100 the PCSV 100 is opened to eliminate foreign substances that are deposited on the PCSV 100, and at stopping S200 the PCSV 100 is opened and closed to have a cycle to eliminate the vacuum between the PCSV 100 and an intake line I.

[0031] When the S100 is started, and when the PCSV 100 is opened and closed, any foreign substances that are condensed, hardened, and adherent (e.g., fixed) to the surface of the PCSV 100, or that have undergone a phase change in ice, are separated from the surface of the PCSV 100. This separation of the foreign substances inhibits or prevents the PCSV 100 from becoming stuck due to the foreign substances, thus preventing malfunction or failure of the PCSV 100.

[0032] During startup S100, the non-operating condition is replaced to restrict the operation of the PCSV 100. The non-operating condition includes: the temperature of the coolant, the ambient air temperature, and the stop time. During startup S100, if the temperature of the coolant of an internal combustion engine E with a crankshaft C, or the temperature of the area (e.g., region, area) where a vehicle (e.g., a motor vehicle) with the internal combustion engine E is located, is less than -5.25°C or exceeds 20°C, the PCSV 100 duty cycle is controlled to maintain the closed state without opening. When starting S100, if the stop time, which is the operating start time of the starter S from the time when the rotation of the crankshaft C was stopped, is less than 2 hours, the PCSV 100 duty cycle is controlled to be closed without opening.

[0033] During startup S100, the PCSV 100 is duty-rate controlled, so that a current is applied to it to achieve an opening amount (e.g., an opening degree) of 80% to 100%. During startup S100, the PCSV 100 is controlled to maintain the open state for a specific time from the moment the crankshaft C starts rotating. As described in Fig. As shown in Figure 2, the PCSV 100 is / will be controlled during the start of S100 to be opened for 0.4 to 0.6 seconds from the rotation start time of the crankshaft C.

[0034] As in Fig. Figure 5 shows a system in which the PCSV-100 control method is used to prevent a malfunction in an embodiment of the present invention: a container 300 for receiving (e.g. absorbing) the evaporated gasoline that has evaporated in a fuel tank 400, a purge line 500 (e.g. a vent line, e.g. a drain line) for connecting the fuel tank 400, the container 300 and the intake line I, wherein the PCSV 100 is mounted on the purge line 500, a check valve 200 is mounted on the purge line 500 to be arranged between the intake line I and the PCSV 100, and a compressor P is mounted on the intake line I to compress 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 line I (e.g. in).The check valve 200 is mounted on the purge line 500, so that the evaporated gasoline only flows towards the intake line I from the PCSV 100.

[0035] When compressor P stops operating because combustion engine E stops, the air that was compressed in intake line I flows back through intake line I to be expelled. Therefore, a vacuum is created in intake line I. The air between check valve 200 and PCSV 100 flows into intake line I by means of this vacuum. As a result, a vacuum is created between check valve 200 and PCSV 100.

[0036] During stop operation S200, the PCSV 100 opens and closes to complete a cycle, allowing outside air to be supplied through a vent valve connected to the tank 300 between the check valve 200 and the PCSV 100 via the purge line 500. As a result, the pressure between the check valve 200 and the PCSV 100 changes from vacuum to atmospheric pressure. During stop operation S200, the PCSV 100 is duty-rate controlled to open and close in one cycle.

[0037] According to one example, the PCSV 100 is opened and closed when S200 is stopped, in order to complete one cycle after the internal combustion engine has stopped and the rotation of the crankshaft C has ceased. As in Fig. As shown in Figure 3, the PCSV 100 is duty cycle-controlled during stop S200 to open and close at least once every 0.2-second cycle from the moment the rotation of the crankshaft C was stopped and one second has elapsed. The PCSV 100 can also be opened and closed only once (e.g., a single time). During stop S200, the time can be 0, maintaining the open and closed states while the PCSV 100 opens and closes in one cycle.

[0038] According to another example, as in Fig. As shown in Figure 4, the PCSV 100 can also be duty-rate controlled during stop S200 to open and close at least once every 0.41-second cycle from the moment the rotation of the crankshaft C was stopped and three seconds have elapsed. In this case, the PCSV 100 can open and close five or more times. During stop S200, the time that maintains the open and closed states can be set to 0, while the PCSV 100 opens and closes in one cycle.

[0039] The PCSV-100 control method for preventing a malfunction in an embodiment of the present invention, configured as described above, is provided in a state stored in a control unit 600 (e.g., a control device), as shown in Fig.Figure 5 is shown. The control unit 600 controls the operation of the PCSV 100 according to the PCSV-100 control procedure to prevent malfunctions.

[0040] According to the PCSV control procedure described above, when starting S100, the PCSV 100 can be opened and closed to eliminate foreign substances that are deposited on the surface of the PCSV 100 during a stop, thereby preventing malfunction or non-operation of the PCSV 100 caused by foreign substances that are adhering to (e.g., fixed to) the surface of the PCSV 100 during a stop.

[0041] Additionally, when stopping the S200 for the PCSV 100, it is possible to open and close it to create a cycle to eliminate the negative pressure between the PCSV 100 and the intake line I, and thereby allow the negative pressure generated within the line connecting the check valve 200 and the PCSV 100 to act on the airtight section of the PCSV 100, thus preventing foreign substances from being absorbed more extensively.

[0042] Additionally, when starting (S100) and stopping (S200), it is possible to operate the PCSV 100 for a short time, thereby generating less noise.

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