JP2019060277A - Flow control device - Google Patents

Abstract

To provide a flow control device which enables reduction of noise etc. associated with pulsation.SOLUTION: A flow control device includes: a purge valve 15; an actuator 16 which drives a flow control valve 161 capable of adjusting a passage cross section area in an inflow side passage 154a located closer to the canister side than a valve body 152; and a control device 50 which controls operation of the actuator 16. The control device 50 controls the actuator 16 so as to narrow the passage cross section area in the inflow side passage 154a when predetermined vehicle state conditions are made. The flow control device enables reduction of noise etc. associated with pressure fluctuation.SELECTED DRAWING: Figure 2

Description

  The disclosure in this specification relates to a flow control device that controls the flow rate of evaporated fuel.

  Patent Document 1 discloses a purge valve which is a solenoid valve capable of adjusting the flow rate of evaporated fuel flowing from a canister side to an intake pipe side of an engine. In recent years, engine low pressure has tended to decrease as fuel consumption of engines decreases. Along with this, the flow rate of the evaporated fuel that can be adjusted by the purge valve is increasing.

JP, 2013-24399, A

  The fluctuation range of the pressure between the purge valve and the canister becomes larger as the maximum flow rate that the purge valve can adjust is larger. For this reason, as the purge valve having a large passage cross-sectional area, the amplitude of the pipe, the canister, etc. connected to the purge valve becomes large, and there is a problem that vibrations, sounds and the like transmitted to the vehicle interior through these become large.

  An object of the disclosure in this specification is to provide a flow control device capable of reducing noise and the like associated with pressure fluctuation.

  Several aspects disclosed in this specification employ different technical means from one another in order to achieve each purpose. Further, the claims and the reference numerals in the parentheses described in this section are an example showing the correspondence with the specific means described in the embodiment described later as one aspect, and the technical scope is limited. is not.

  One of the disclosed flow control devices is a housing (150) having a fuel passage (153) through which evaporated fuel flowing out of the canister (13) flows by the intake pressure of the engine (2) and a valve seat (155) And a valve body (152) for opening and closing the fuel passage so as to switch between an open state for permitting the flow of evaporative fuel and a closed state for preventing the flow of evaporative fuel in contact with the valve seat; The electromagnetic solenoid (151) generates a driving force for driving the movable core (1511) displaced with the valve in the axial direction to switch the valve, and the inflow side passage (154a) located closer to the canister than the valve. An actuator (16) for driving a flow rate adjusting unit (161) capable of adjusting a flow passage cross-sectional area, and a control device (50) for controlling the operation of the actuator. The control device controls the actuator so as to narrow the flow passage cross-sectional area in the inflow side passage when a predetermined vehicle state condition in which noise accompanying the pressure fluctuation can be assumed is satisfied.

  According to this flow rate adjustment device, pressure fluctuation in the passage through which the evaporative fuel flows in order to narrow the flow passage cross-sectional area in the inflow side passage when a predetermined vehicle state condition is established where noise due to pressure fluctuation can be assumed. Can be reduced. By narrowing the inflow side passage positioned closer to the canister side than the valve body, it is possible to suppress the fluctuation range of the pressure propagating from the fuel flow passage in the housing to the canister side through the inflow side passage. As mentioned above, the flow control device which can reduce the noise etc. accompanying pressure fluctuation is obtained.

  One of the disclosed flow control devices is a housing (150) having a fuel passage (153) through which evaporated fuel flowing out of the canister (13) flows by the intake pressure of the engine (2) and a valve seat (155) And a valve body (152) for opening and closing the fuel passage so as to switch between an open state for permitting the flow of evaporative fuel and a closed state for preventing the flow of evaporative fuel in contact with the valve seat; The electromagnetic solenoid (151) generates a driving force for driving the movable core (1511) displaced with the valve in the axial direction to switch the valve, and the inflow side passage (154a) located closer to the canister than the valve. An actuator (16) for driving a flow rate adjustment unit (161) capable of adjusting a flow passage cross-sectional area, and a control device for controlling a duty ratio of a voltage applied to an electromagnetic solenoid unit 0) and a low pass filter (17) provided in the middle of the energization path connecting the electromagnetic solenoid unit and the actuator, and the low pass filter has a predetermined duty ratio value of the voltage applied to the electromagnetic solenoid unit When the duty ratio value is exceeded, the voltage output to the actuator is reduced with respect to the voltage applied to the electromagnetic solenoid unit, so that the output voltage to the actuator increases more than before the flow regulator adjusts the flow Narrow the flow path cross section in the

  According to this flow control device, when the duty ratio value of the voltage applied to the electromagnetic solenoid unit exceeds the predetermined duty ratio value, the output voltage of the actuator is lowered by the low pass filter and the output voltage to the actuator is higher than the above Also increases. As a result, the actuator operates to narrow the flow passage cross-sectional area in the inflow side passage. In this manner, since the inflow side passage located closer to the canister side than the valve body is narrowed, it is possible to suppress the fluctuation range of the pressure propagating from the fuel flow passage in the housing to the canister side through the inflow side passage. From the above, it is possible to obtain a flow rate adjusting device capable of reducing noise and the like associated with pressure fluctuation without providing the function of determining the vehicle state condition and performing processing according to the determination result in the control device.

It is a figure showing an evaporative fuel processing device provided with a flow control device of a 1st embodiment. It is a schematic diagram for explaining composition of a flow control device. It is a schematic diagram for explaining the state where the inflow side passage is not narrowed. It is a schematic diagram for explaining the state where the inflow side passage was narrowed. It is the flowchart which showed the control processing which concerns on the flow regulating device of 1st Embodiment. It is the flowchart which showed the control processing which concerns on the flow regulating device of 2nd Embodiment. It is a block diagram for demonstrating the flow regulating device of 3rd Embodiment. It is a chart figure showing control concerning a flow control device of a 3rd embodiment.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. The same referential mark may be attached | subjected to the part corresponding to the matter demonstrated by the form preceded in each form, and the overlapping description may be abbreviate | omitted. When only a part of the configuration is described in each form, the other forms described above can be applied to other parts of the configuration. Not only combinations of parts which clearly indicate that combinations are possible in each embodiment, but also combinations of embodiments even if not explicitly specified, unless any problem occurs in the combinations. It is also possible.

First Embodiment
The first embodiment will be described with reference to FIGS. 1 to 5. The flow rate adjustment device is used in an evaporative fuel processing device 1 which is an evaporative fuel purge system mounted on a vehicle. As shown in FIG. 1, the evaporative fuel processing apparatus 1 supplies HC gas and the like in the fuel adsorbed to the canister 13 to the intake passage of the engine 2 and releases the evaporative fuel from the fuel tank 10 to the atmosphere. To prevent. The evaporated fuel processing device 1 includes an intake system of the engine 2 constituting an intake passage of the engine 2 which is an internal combustion engine, and an evaporated fuel purge system which supplies the evaporated fuel to the intake system of the engine 2.

  The evaporated fuel introduced into the intake passage by the intake pressure of the engine 2 is mixed with the fuel for combustion supplied to the engine 2 from an injector or the like, and is burned in the combustion chamber of the engine 2. The engine 2 mixes and burns at least the evaporated fuel desorbed from the canister 13 and the fuel for combustion. In the intake system of the engine 2, an intake pipe 21 constituting an intake passage is connected to an intake manifold 20, and a throttle valve 25, an air filter 24 and the like are provided in the middle of the intake pipe 21.

  In the evaporated fuel purge system, a fuel tank 10 and a canister 13 are connected by a pipe 11 forming a vapor passage, and the canister 13 and an intake pipe 21 are connected via a pipe 14 forming a purge passage and a purge valve 15. A purge pump may be provided in the middle of the purge passage. The air filter 24 is provided on the upstream side of the intake pipe 21 and captures dust, dirt, and the like in intake. The throttle valve 25 is an intake amount adjustment valve that adjusts the opening degree of the inlet portion of the intake manifold 20 to adjust the intake amount flowing into the intake manifold 20. The intake air passes through the intake passage, flows into the intake manifold 20, is mixed with combustion fuel injected from an injector or the like so as to have a predetermined air-fuel ratio, and is burned in the combustion chamber.

  The fuel tank 10 is a container for storing fuel such as gasoline, for example. The fuel tank 10 is connected to the inflow portion of the canister 13 by a pipe 11 forming a vapor passage. The canister 13 is a container in which an adsorbent such as activated carbon is sealed, and evaporative fuel generated in the fuel tank 10 is taken in through the vapor passage and temporarily adsorbed on the adsorbent.

  The canister 13 is integrally provided with a valve module 12. The valve module 12 includes a canister close valve that opens and closes a suction unit for suctioning fresh air from the outside, and an internal pump that can release gas to the atmosphere and can suction the atmosphere. It is built-in. An atmospheric pressure can be applied to the canister 13 by providing the canister 13 with a canister close valve. The canister 13 can easily desorb, that is, purge, the evaporated fuel adsorbed on the adsorbent by the fresh air drawn in.

  The purge valve 15 is a purge passage, that is, a switching device having a valve body 152 for opening and closing a fuel passage 153 provided inside the housing 150, and permits and blocks supply of the fuel vapor from the canister 13 to the engine 2. it can. The purge valve 15 is a valve device that keeps the fuel passage 153 closed at the normal time when no voltage is supplied. The purge valve 15 is a normally closed valve device that is in a closed state closing the fuel passage 153 when a voltage is not applied, and is controlled to open the fuel passage 153 when a voltage is applied. By switching between the open state and the closed state as described above, the purge valve 15 can adjust the purge amount of the evaporated fuel in the evaporated fuel processing device 1.

  In recent years, the engine negative pressure has tended to decrease as the fuel consumption of the engine decreases, and the purge valve is required to have a performance capable of adjusting a large flow rate. On the other hand, it is known that the fluctuation range of the pressure when the valve body of the purge valve 15 moves from the open state to the closed state becomes larger as the adjustable maximum flow rate in the purge valve 15 becomes larger. Therefore, as the adjustable flow rate value of the purge valve 15 is larger, the fluctuation range of the pressure between the purge valve 15 and the canister 13 is larger, and this phenomenon is a factor of the noise in the vehicle. Since the pipe connecting the purge valve 15 and the canister 13 is provided, for example, under the floor of the vehicle compartment, noise due to vibration of the pipe is easily transmitted to the vehicle compartment. Therefore, the fuel vapor processing apparatus 1 of this embodiment has a function of suppressing the pressure fluctuation range.

  As shown in FIG. 2, the purge valve 15 includes a valve seat 155, a valve body 152, an electromagnetic solenoid unit 151, and the like. The electromagnetic solenoid unit 151 includes a yoke, a bobbin, a coil 1510, a fixed core, a movable core 1511, a connector for supplying power, and the like. The yoke, the fixed core, the movable core 1511 and the like are formed of a magnetic material. The electromagnetic solenoid unit 151 is configured to be able to control the current supplied to the coil 1510 by electrically connecting the terminal terminal to the control device 50 or the like that controls the supply voltage by the connector.

  In order to switch between the open state in which the valve body 152 separates from the valve seat 155 to permit the flow of fluid and the closed state in which the valve seat 155 contacts the valve seat 155 to block the flow of fluid, the electromagnetic solenoid unit 151 operates. And generates a driving force for axially driving the movable core 1511 displaced integrally with the When the coil 1510 of the electromagnetic solenoid unit 151 is energized from the closed state, a magnetic flux is generated in the magnetic circuit formed by the yoke, the movable core 1511, the fixed core and the like. The movable core 1511 is axially attracted toward the fixed core by the magnetic force associated with the magnetic flux, thereby moving toward the fixed core against the biasing force of the spring and moving the valve body 152 away from the valve seat 155 Then, the fuel passage 153 is opened.

  For example, the control device 50 controls the ratio of the on time to the time of one cycle formed by the on time and the off time of the energization, that is, the duty ratio to energize the coil 1510. The purge valve 15 is also referred to as a duty control valve. The purge valve 15 can control the valve opening amount continuously by changing the duty ratio controlled by the duty signal. By this energization control, the flow rate (purge amount) of the evaporated fuel flowing through the fuel passage 153 can be adjusted.

  The housing 150 of the purge valve 15 is provided with an input port 154 for receiving the supply of fluid from the canister 13 side, and an output port 156 for the fluid to flow out to the engine 2 side. The housing 150 accommodates the electromagnetic solenoid unit 151, the valve body 152, and the like. An inflow side passage 154 a provided inside the input port 154 is in communication with the canister 13 through a pipe 14 connected to the canister 13. The inflow side passage 154 a is a passage located closer to the canister 13 than the fuel passage 153 and the valve body 152. The inflow side passage 154 a is configured by the flow rate adjusting valve 161 so as to be able to adjust the flow rate of the evaporated fuel flowing in from the canister 13 side. The flow rate adjustment valve 161 is a flow rate adjustment unit that can adjust the opening degree of the inflow side passage 154a, that is, the flow passage cross-sectional area in the inflow side passage 154a. The flow control valve 161 is driven by the actuator 16 to adjust the opening degree of the inflow side passage 154a.

  The actuator 16 moves the movable core 162 integral with the flow control valve 161 in the axial direction by the electromagnetic force generated by the supply voltage, like the electromagnetic solenoid unit 151 of the purge valve 15. The actuator 16 maintains a normal state (full open state) in which the fuel passage 153 is not narrowed in a non-energized state where no voltage is supplied. When the control device 50 energizes the coil 163, the actuator 16 is in a throttling state in which the generated electromagnetic force overcomes the elastic force of the spring and the flow control valve 161 narrows the inflow side passage 154a.

  The control device 50 has at least one arithmetic processing unit (CPU) and at least one memory device as a storage medium for storing programs and data. The controller 50 is provided by, for example, a microcomputer provided with a computer readable storage medium. A storage medium is a non-transitory tangible storage medium which non-temporarily stores a computer readable program. The storage medium may be provided by semiconductor memory or a magnetic disk or the like. The controller 50 may be provided by one computer or a set of computer resources linked by a data communication device. The program is executed by the controller 50 to cause the controller 50 to function as the device described in this specification and to function the controller 50 to execute the method described in this specification.

  The means and / or function provided by the control device 50 can be provided by software stored in a tangible memory device and a computer that executes the software, only software, only hardware, or a combination thereof. For example, if the controller 50 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit or analog circuit that includes a number of logic circuits.

  The actuator 16 can switch the inflow side passage 154a between the fully open state and the throttling state. The fully open state is when the actuator 16 is in the non-energized state, and as shown in FIG. 3, the flow rate adjustment valve 161 is located closest to the actuator 16 and is at the top of the inflow side passage 154 a. In the fully open state, the pressure fluctuation propagating from the valve body 152 to the inflow side passage 154a is transmitted to the passage on the canister 13 side without the amplitude becoming smaller in the inflow side passage 154a as shown by a broken line in FIG.

  The throttling state is a state in which a voltage is supplied to the actuator 16, and as shown in FIG. 4, the flow rate adjusting valve 161 is at a position farthest from the actuator 16, narrowing the flow passage cross section in the inflow side passage 154a. It is in the state of In the squeezed state, the pressure fluctuation propagating from the valve body 152 to the inflow side passage 154a becomes smaller in amplitude when passing through the narrowed inflow side passage 154a as shown by a broken line in FIG. Will be transmitted to In the throttling state, the pressure fluctuation transmitted to the passage on the canister 13 side is suppressed compared to the fully open state, and therefore, when noise can be assumed, pulsation in the passage on the canister 13 side is reduced by controlling the throttling state. Noise can be prevented in advance.

  The operation of the flow control device will be described with reference to the flowchart of FIG. Control device 50 executes the process according to the flowchart of FIG. The present flowchart operates regardless of whether the engine 2 is driving, stopping, or stopping.

  When the present flowchart is started, control device 50 determines whether or not the vehicle condition condition predetermined in step S100 is satisfied. The vehicle state condition is a preset condition which can be assumed that noise is generated in accordance with the pressure fluctuation in the passage through which the evaporative fuel flows. The vehicle state condition can be set to a condition when the vehicle is stopped and the engine 2 is operating. That is, if the current vehicle state is waiting for a signal, if it is once stopped, if it is in the idling state before leaving, etc., the control device 50 determines that the vehicle state condition is satisfied in step S100. . If it is determined in step S100 that the vehicle state condition is not established, the process of step S100 is repeatedly executed.

  When the vehicle is stopped and the vehicle condition condition that the engine 2 is operating is satisfied, the road noise and the like due to traveling are not generated, so the sound accompanying the pressure fluctuation is traveling Compared to the above, it may be easier to transmit to the occupants in the vehicle compartment and may result in noise. In order to suppress the noise, when the vehicle state condition is satisfied in step S100, the control device 50 executes a process of controlling the actuator 16 to operate the flow rate adjusting valve 161 in the throttling state in step S110. Next, the control device 50 returns to step S100 and continuously executes the process of step S100.

  Further, the control device 50 may execute a process of determining that the vehicle state condition is satisfied when the current vehicle speed is lower than the predetermined speed in step S100. Control device 50 obtains the current vehicle speed based on the vehicle speed information detected by vehicle speed sensor 61. The vehicle speed sensor 61 outputs vehicle speed information to a vehicle ECU 60 that controls traveling control of the vehicle and a cooling system necessary for traveling the vehicle, and the vehicle speed information is output from the vehicle ECU 60 to the control ECU. The predetermined speed is preferably set based on an experimental result or a rule of thumb, and is set to a vehicle speed at which the sound accompanying the pressure fluctuation is scraped by the running sound and it is difficult for the occupant in the vehicle compartment to recognize. By setting the vehicle condition condition to the condition that the current vehicle speed is lower than the predetermined speed, when the vehicle speed is small and there is not much travel noise, the noise accompanying the pressure fluctuation may be a noise to the passenger in the vehicle compartment. It can be suppressed.

  Further, the control device 50 may execute a process of determining that the vehicle state condition is satisfied when the current rotation speed of the engine 2 is lower than the predetermined rotation speed in step S100. When this determination process is adopted, the predetermined number of revolutions is preferably set based on experimental results or empirical rules, and is set to a number of revolutions at which the sound accompanying the pressure fluctuation is scraped off by the engine sound and hardly recognized by the occupant. It shall be set. By setting the vehicle condition condition to the condition that the current engine speed is lower than the predetermined speed, when the engine speed is quiet and the noise accompanying the pressure fluctuation is a noise to the passenger in the vehicle compartment Can be reduced.

  Furthermore, the control device 50 preferably controls the actuator 16 so as to expand the flow passage cross-sectional area in the inflow side passage 154a when the acceleration of the vehicle exceeds the predetermined acceleration. Control device 50 acquires acceleration information of the vehicle from vehicle ECU 60. The vehicle ECU 60 can acquire acceleration information detected by an acceleration detection device such as, for example, an automotive gyro sensor. When this determination process is adopted, the predetermined acceleration is preferably set based on experimental results or empirical rules, and the sound accompanying the pressure fluctuation is scraped off by the traveling sound or engine sound by acceleration and recognized by the occupant in the vehicle compartment It shall be set to an acceleration that is difficult to By setting the vehicle condition condition to a condition where the current acceleration of the vehicle exceeds the predetermined acceleration, the purge flow rate is set when noise caused by pressure fluctuation is not felt as noise by the occupant due to engine noise or running noise by acceleration. The purge performance can be exhibited without throttling.

  The effect which the flow control device of a 1st embodiment brings about is explained. The flow rate adjusting device operates the purge valve 15, an actuator 16 for driving a flow rate adjusting valve 161 that can adjust the flow passage cross-sectional area in the inflow side passage 154a located closer to the canister 13 than the valve body 152, and And a control device 50 for controlling. The control device 50 controls the actuator 16 so as to narrow the flow passage cross-sectional area in the inflow side passage 154a when a predetermined vehicle state condition in which noise associated with pressure fluctuation can be assumed is satisfied.

  According to this flow rate adjustment device, the flow passage cross-sectional area of the inflow side passage 154a located closer to the canister 13 than the valve body 152 when a predetermined vehicle state condition is established, in which noise associated with pressure fluctuation can be assumed. Squeeze. Thereby, the fluctuation range of the pressure propagating from the fuel passage 153 in the housing 150 to the canister 13 through the inflow side passage 154a can be suppressed. The flow control device can thus reduce noise and the like associated with pressure fluctuations.

  Further, since the flow rate adjusting device has a configuration capable of suppressing the fluctuation range of pressure without having a large chamber, the upsizing of the device can be suppressed and the vehicle mounting property can be improved. Furthermore, since the flow rate adjustment device has a configuration for squeezing the evaporated fuel flowing into the purge valve 15, the flow rate adjustment device can be applied to the purge valve 15 that has a large flow rate in a controllable range. That is, the flow rate adjusting device can provide the evaporated fuel processing device 1 capable of controlling a large flow rate and suppressing the pressure fluctuation range in the pipe on the canister 13 side. In other words, the flow control device can realize a device having two-stage flow characteristics that can control a low flow rate and can control a large flow rate.

Second Embodiment
The flow control device of the second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the operation of the flow control device. The configurations, operations, and effects not particularly described in the second embodiment are the same as those in the first embodiment.

  Control device 50 executes the process according to the flowchart of FIG. Step S220 in FIG. 6 is the same process as step S100 in FIG.

  The control device 50 determines whether or not the concentration is high based on canister concentration learning in step S200. If it is determined in step S200 that the concentration is lower than the reference value, a process of controlling the actuator 16 to operate the flow rate adjustment valve 161 in the throttled state is executed in step S205. Through this process, the flow control device carries out a small flow rate purge. If it is determined in step S200 that the concentration is higher than the reference value, in step S210, a process of controlling the actuator 16 to operate the flow rate adjustment valve 161 in a fully open state is executed.

  After step S205 or step S210 is performed, it is determined in step S220 whether a predetermined vehicle condition condition is satisfied. If it is determined in step S220 that the vehicle state condition is satisfied, the flow rate adjustment valve 161 is operated in a throttled state or a process of controlling the actuator 16 to maintain the throttled state is executed in step S230. If it is determined in step S220 that the vehicle state condition is not established, the flow control valve 161 is operated fully open in step S225, or processing for controlling the actuator 16 to maintain the fully open state is executed.

  In the case of canister concentration learning, the evaporated fuel processing device 1 controls the purge valve 15 so as to gradually increase the duty ratio from the low duty ratio. The evaporative fuel processing apparatus 1 learns the canister concentration while detecting the amount of change of the air-fuel ratio while gradually increasing the purge flow rate by controlling the purge valve 15 in this manner. The purge valve, which has a large flow rate specification, has a large change in flow rate with respect to a change in duty ratio compared to a valve with a low flow rate specification, so the engine may use an air fuel ratio that exceeds the allowable value and may stall. is there. In other words, as the flow rate is increased, the variation in the flow rate with respect to the duty ratio is increased, and the air-fuel ratio of the vehicle does not follow and there is a problem that the engine stalls.

  Therefore, the controller 50 controls the actuator 16 to operate the flow rate adjusting valve 161 in the throttled state at the time of canister concentration learning, thereby controlling to a valve specification with a low flow rate with a small flow rate change at the canister concentration learning. Reduce troubles.

  Further, after learning of the canister concentration, the control device 50 does not execute step S220 by determining that it is not at the canister concentration learning time in step S210. As a result, since the flow control valve 161 is set to the fully open state, it is possible to carry out a large flow rate purge to exert a desired purge function. That is, when the flow control device knows the canister concentration and wants to purge a large amount during traveling, the flow path is expanded by the actuator and used as a large flow valve.

  In addition, since the flow control device can be used as a large flow valve when traveling and the canister concentration is known, the flow control device has an effect as a pulsating noise countermeasure.

Third Embodiment
The flow control device of the third embodiment will be described with reference to FIGS. 7 and 8. The third embodiment is different from the first embodiment in that the operating voltage of the actuator 16 is suppressed by the low-pass filter 17 to control in the throttling state. The configurations, operations, and effects not particularly described in the third embodiment are the same as those in the first embodiment, and only differences from the above-described embodiment will be described below.

  As illustrated in FIG. 7, the flow rate adjusting device of the third embodiment includes a module 18 including a purge valve 15, a low pass filter 17, and an actuator 16. The voltage of the duty ratio value controlled by the control device 50 is applied to the purge valve 15 and the low pass filter 17, respectively, and the operation cut by the low pass filter 17 when the predetermined condition is satisfied is set to the predetermined duty ratio value A voltage is supplied to the actuator 16. That is, the operating voltage of the actuator 16 is not controlled by the controller 50. The duty ratio supplied to the low pass filter 17 is supplied to the actuator 16 as a value automatically reduced by the low pass filter 17.

  As shown in FIG. 8, when the increased duty ratio value controlled by the controller 50 exceeds a predetermined value, the low pass filter 17 lowers the voltage output to the actuator 16 than the voltage supplied to the purge valve 15. As a result, the operating voltage applied to the actuator 16 becomes higher than the supply voltage before the duty ratio value increases. By controlling the supply voltage in this manner, the actuator 16 controls the flow control valve 161 so as to narrow the flow passage cross-sectional area of the inflow side passage 154a. As described above, in the flow control device of the third embodiment, the low pass filter 17 automatically operates the actuator 16 at a certain duty ratio value to change the flow rate. In the flow rate adjusting device according to the third embodiment, when the duty ratio value controlled by the control device 50 exceeds the set value, the low pass filter 17 operates at the operating voltage of the actuator 16 so as to suppress an increase in pressure fluctuation range due to large flow rate control. Demonstrate the ability to cut As a result, when the flow rate at which the purge valve 15 can be controlled is increased, the pressure fluctuation range can be automatically suppressed and noise can be prevented in advance without performing the determination process by the control device 50.

  The flow control device of the third embodiment controls the duty ratio of the voltage applied to the electromagnetic solenoid 151, and the low pass filter 17 provided in the middle of the conduction path connecting the electromagnetic solenoid 151 and the actuator 16. And. The low-pass filter 17 reduces the voltage output to the actuator 16 when the duty ratio of the voltage applied to the electromagnetic solenoid unit 151 exceeds the predetermined duty ratio value, as compared with the voltage applied to the low-pass filter 17 to thereby control the flow rate adjustment valve. The step 161 narrows the flow passage cross-sectional area in the inflow side passage 154a.

  According to this flow rate adjustment device, when the duty ratio value of the voltage applied to the electromagnetic solenoid unit 151 exceeds the predetermined duty ratio value, the output voltage to the actuator 16 by the low pass filter 17 is lower than the supply voltage to the purge valve 15 . As a result, the voltage output to the actuator 16 increases more than the supply voltage before the increase of the duty ratio value, so the cross-sectional area of the flow passage in the inflow side passage 154a is narrowed. As a result, the inflow side passage 154a located closer to the canister 13 than the valve body 152 is narrowed, so that the fluctuation range of the pressure propagating from the fuel passage 153 to the canister 13 through the inflow side passage 154a can be suppressed. Therefore, it is possible to provide a flow rate adjustment device capable of reducing noise and the like associated with pressure fluctuation without providing the function of determining the vehicle state condition and performing processing according to the determination result in the control device 50.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure includes the illustrated embodiments and variations based on them by those skilled in the art. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiments, and can be implemented with various modifications. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure includes the parts and components of the embodiments omitted. The disclosure includes replacements of parts, components, or combinations between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is defined by the description of the claims, and should be understood to include all the modifications within the meaning and scope equivalent to the descriptions of the claims.

  In the above-described embodiment, the control device 50 supplies power to the purge valve 15 by controlling the ratio of the on time to the time of one cycle formed by the on time and the off time of the energization, that is, the duty ratio. However, it is not limited to such power supply. For example, the purge valve 15 may be controlled by on / off control that selects either the on state to which a predetermined voltage value is supplied or the off state to which power is not supplied according to the measurement value.

  In the above embodiment, the pressure fluctuation propagating from the fuel passage 153 to the inflow passage 154a described with reference to FIGS. 3 and 4 occurs only when the purge valve 15 controls the fuel passage 153 in the closed state. It is not something to do. The propagation of the pressure fluctuation indicated by the broken line in FIGS. 3 and 4 is a phenomenon that can also occur when the purge valve 15 controls the fuel passage 153 in the open state.

DESCRIPTION OF SYMBOLS 2 ... engine, 13 ... canister, 16 ... actuator 17 ... low pass filter, 50 ... control device, 150 ... housing 151 ... electromagnetic solenoid part, 152 ... valve body, 153 ... fuel passage 154a ... inflow side passage, 155 ... valve seat 161 ... Flow adjustment valve (flow adjustment section), 1511 ... Movable core

Claims (7)

A housing (150) having a fuel passage (153) through which the evaporated fuel flowing out of the canister (13) flows by the intake pressure of the engine (2);
A valve element for opening and closing the fuel passage so as to switch between an open state for permitting the flow of the evaporative fuel away from the valve seat (155) and a closed state for preventing the flow of the evaporative fuel in contact with the valve seat (152),
An electromagnetic solenoid unit (151) generating a driving force for axially driving a movable core (1511) displaced together with the valve body to switch between the open state and the closed state;
An actuator (16) for driving a flow rate adjusting section (161) capable of adjusting a flow passage cross-sectional area of the inflow side passage (154a) positioned closer to the canister than the valve body;
A controller (50) for controlling the operation of the actuator;
Equipped with
The control device controls the actuator so as to narrow the flow passage cross-sectional area in the inflow side passage when a predetermined vehicle state condition in which noise associated with pressure fluctuation can be assumed is satisfied.   The flow control device according to claim 1, wherein the control device controls the actuator so as to narrow a flow passage cross-sectional area in the inflow side passage when the vehicle is stopped and the engine is operating.   The flow control device according to claim 1, wherein the control device controls the actuator so as to narrow a flow passage cross-sectional area in the inflow side passage when the vehicle speed is lower than a predetermined speed.   The flow control device according to claim 1, wherein the control device controls the actuator so as to narrow a flow passage cross-sectional area in the inflow side passage when the number of rotations of the engine is lower than a predetermined number of rotations.   The controller according to any one of claims 2 to 4, wherein the control device controls the actuator so as to expand a flow passage cross-sectional area in the inflow side passage when the acceleration of the vehicle exceeds a predetermined acceleration. Flow control device.   The controller according to any one of claims 1 to 5, wherein the controller further controls the actuator so as to narrow a flow passage cross-sectional area in the inflow side passage at the time of canister concentration learning in which the concentration of evaporated fuel in the canister is learned. The flow control device as described in a paragraph. A housing (150) having a fuel passage (153) through which the evaporated fuel flowing out of the canister (13) flows by the intake pressure of the engine (2);
A valve element for opening and closing the fuel passage so as to switch between an open state for permitting the flow of the evaporative fuel away from the valve seat (155) and a closed state for preventing the flow of the evaporative fuel in contact with the valve seat (152),
An electromagnetic solenoid unit (151) generating a driving force for axially driving a movable core (1511) displaced together with the valve body to switch between the open state and the closed state;
An actuator (16) for driving a flow rate adjusting section (161) capable of adjusting a flow passage cross-sectional area of the inflow side passage (154a) positioned closer to the canister than the valve body;
A control device (50) for controlling a duty ratio of a voltage applied to the electromagnetic solenoid unit;
A low pass filter (17) provided in the middle of an energization path connecting the electromagnetic solenoid unit and the actuator;
Equipped with
The low pass filter lowers the voltage output to the actuator with respect to the voltage applied to the electromagnetic solenoid unit, when the duty ratio value of the voltage applied to the electromagnetic solenoid unit exceeds a predetermined duty ratio value. Thereby, the output voltage to the actuator increases more than before the increase, and the flow rate adjusting unit narrows the flow passage cross-sectional area in the inflow side passage.

Images