JP7431785B2 - Processing equipment, vehicles, processing methods, and programs - Google Patents

Description

The present invention relates to a technology for processing fuel vapor generated within a fuel tank of a vehicle.

Patent Document 1 discloses a so-called canister purge control (purge process), which is a technique for supplying fuel vapor stored in a canister to an internal combustion engine for combustion processing.

Japanese Patent Application Publication No. 2012-211564

The purge process may be performed, for example, using the opening degree of a throttle valve that adjusts the intake air amount to the internal combustion engine as an index, and when the opening degree of the throttle valve exceeds a threshold value. In this case, from the perspective of ensuring the amount of fuel vapor (purge amount) supplied from the canister to the internal combustion engine, the threshold value is set to a low value so that the purge process is executed even when the throttle valve opening is small. It would be good if it were done. However, if the canister is fully charged, for example, and the purge process is started with a small opening of the throttle valve, the amount of fuel vapor supplied to the internal combustion engine will become overrich, resulting in poor drivability. (DR) may decrease or a misfire may occur in the internal combustion engine.

Therefore, an object of the present invention is to provide a technique that can appropriately supply fuel vapor stored in a canister to an internal combustion engine.

In order to achieve the above object, a processing device as one aspect of the present invention is a processing device that processes fuel vapor generated in a fuel tank of a vehicle, and includes a canister for storing the fuel vapor, and a processing device for processing fuel vapor generated in a fuel tank of a vehicle. an opening detection means for detecting the opening of a throttle valve that adjusts the amount of intake air into the internal combustion engine; control means for executing a purge process for supplying the fuel vapor to the internal combustion engine; the opening threshold is set to a first opening threshold when the internal combustion engine is started, and is detected by the opening detection means. After the opening exceeds the first opening threshold and the purge process is started, the second opening threshold is changed to a second opening threshold that is smaller than the first opening threshold , and the second opening threshold is It is characterized in that the purge process is set not to be performed in a state in which the opening degree detected by the opening degree detection means is 0 degrees .

According to the present invention, for example, it is possible to provide a technique that can appropriately supply fuel vapor stored in a canister to an internal combustion engine.

Schematic diagram showing a configuration example of a processing device according to the first embodiment Flowchart showing purge processing in the first embodiment Timing chart showing implementation timing of purge processing in the first embodiment Diagram showing time changes in throttle opening and opening threshold in the second embodiment Diagram showing time changes in throttle opening and opening threshold in the fifth embodiment

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the following embodiments, but also includes changes and modifications of the configuration within the scope of the spirit of the present invention. Furthermore, not all combinations of features described in this embodiment are essential to the present invention. In addition, the same reference numerals are given to the same component, and the description thereof will be omitted.

<First embodiment>
A first embodiment according to the present invention will be described. FIG. 1 is a schematic diagram showing a configuration example of a processing device 100 of this embodiment. The processing device 100 is a device that processes fuel vapor generated within a fuel tank of a vehicle. The vehicle on which the processing device 100 is mounted may be a saddle type vehicle such as a motorcycle or a tricycle, or a four-wheel vehicle. The vehicle is equipped with an internal combustion engine 1 (engine). Outside air is introduced into the internal combustion engine 1 from an air cleaner (AC) 3 via a throttle body (THB) 2 that constitutes an intake system. Throttle body 2 includes a throttle valve that adjusts the amount of intake air into internal combustion engine 1 . Further, an injector 4 that is a fuel injection device is attached to the internal combustion engine 1, and the injector 4 injects fuel into the combustion chamber of the internal combustion engine 1.

The injector 4 is connected to one end of a fuel supply passage 6 that supplies fuel from a fuel tank 5 that stores fuel such as gasoline. The other end of the fuel supply passage 6 is connected to a fuel pump 7 installed inside the fuel tank 5. When the fuel pump 7 is driven, the liquid fuel in the fuel tank 5 is pumped toward the injector 4 via the fuel supply passage 6.

A fuel filler cap 8 is attached to the upper opening of the fuel tank 5 so as to be openable and closable. A gas-liquid separation means 9 is integrally attached to the fuel filler cap 8 to separate a gas phase that is evaporated fuel from a liquid phase that is unevaporated fuel using a labyrinth structure or the like. This gas-liquid separation means 9 is formed, for example, in an annular shape, and one end of a charge passage 10 is connected to a gas phase portion into which only evaporated fuel is introduced. The charge passage 10 is a passage that communicates between the fuel tank 5 and a canister 11 that stores evaporated fuel.

The canister 11 includes a drain (D) passage 12 for discharging the liquid fuel that has entered the canister 11, an atmosphere opening passage 13 for opening the canister 11 to the atmosphere (A), and a drain (D) passage 13 for opening the canister 11 to the atmosphere (A). ) are connected to purge passages 14 (communication passages) that communicate with each other. A purge control valve 15 is arranged in the purge passage 14 to open and close communication between the canister 11 and the throttle body 2 in accordance with a control signal from the control unit 20 . As the purge control valve 15, for example, an ON/OFF opening/closing valve or a duty control valve (including one whose valve diameter can be arbitrarily adjusted) can be applied, but the purge control valve 15 is not limited to these, and various types of control valves can be used. is applicable.

The canister 11 has an adsorbent such as activated carbon inside, and when gas containing relatively high concentration of fuel vapor is introduced through the charge passage 10, the canister 11 absorbs the fuel vapor contained in this gas. It is adsorbed and stored on an adsorbent. Furthermore, when the purge control valve 15 is opened and intake negative pressure accompanying the operation of the internal combustion engine 1 is applied to the canister 11 via the purge passage 14, gas with a low concentration of fuel vapor (for example, the atmosphere) flows into the atmosphere opening passage. Fuel vapor introduced into the canister 11 through the purge passage 13 and adsorbed by the adsorbent is supplied to the purge passage 14 .

The control unit 20 controls a purge process for supplying (purging) fuel vapor stored in the canister 11 to the internal combustion engine 1 via the throttle body 2 or the intake passage downstream thereof, based on detection results from various sensors. do. The control unit 20 is, for example, an ECU (Electronic Control Unit), and may be configured by a computer including a processor represented by a CPU, a storage device such as a semiconductor memory, an interface with an external device, and the like. In the case of this embodiment, the storage device (memory) of the control unit 20 stores an application program (hereinafter sometimes referred to as a purge process program) for executing the purge process, and the control unit 20 The processor can read and execute the purge processing program stored in the storage device. Here, the purge processing program may be stored in a storage medium such as a CD-ROM or DVD and installed in the control unit 20 from the storage medium, or may be downloaded from an external server via a network and installed in the control unit 20. May be installed.

The control unit 20 is connected to various sensors such as a throttle opening sensor 21 (opening degree detection section), a rotation speed sensor 22 (rotation speed detection section), and a temperature sensor 23 (temperature detection section). The throttle opening sensor 21 is a sensor that detects the opening of a throttle valve provided in the throttle body 2 (throttle opening). The rotation speed sensor 22 is a sensor that detects the rotation speed of the internal combustion engine 1 (engine rotation speed). The temperature sensor 23 is a sensor that detects the temperature of cooling water or oil (water temperature or oil temperature) flowing through the internal combustion engine 1. The control unit 20 sequentially acquires information detected by a throttle opening sensor 21, a rotation speed sensor 22, and a temperature sensor 23 as various sensors, and controls the purge control valve 15 based on the information to perform the purge process. can be controlled. Note that the throttle opening sensor 21 may be a negative pressure sensor that detects intake manifold negative pressure. Further, the rotational speed of the internal combustion engine 1 (engine rotational speed) may be understood as the rotational speed of the internal combustion engine 1.

The purge process can be performed using the throttle opening as an index and when the throttle opening exceeds a threshold value. In this case, from the perspective of ensuring the amount of fuel vapor (purge amount) supplied from the canister 11 to the internal combustion engine 1, the threshold value is set to a low value so that the purge process is executed even when the throttle opening is small. It would be good if it were done. However, if the canister 11 is fully charged, for example, and the purge process is started with a small throttle opening, the amount of fuel vapor supplied to the internal combustion engine 1 will be excessive (over-rich), resulting in poor drivability. (DR) may decrease or misfire of the internal combustion engine 1 may occur.

Therefore, in the processing device 100 of the present embodiment, the first opening threshold TH _PG1 and the second opening smaller than the first opening threshold TH _PG1 are used as the throttle opening threshold (opening threshold) for executing the purge process. A threshold value TH _PG2 is used. The opening threshold is set to the first opening threshold TH _PG1 when the internal combustion engine 1 is started, and when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH _PG1 , the purge process is performed. After starting, the first opening threshold TH _PG1 is changed to the second opening threshold TH _PG2 . The first opening threshold TH _PG1 and the second opening threshold TH _PG2 can be arbitrarily set by experiment or simulation, but for example, if the first opening threshold TH _PG1 and the second opening threshold TH _{PG2 are between the first opening threshold TH PG1 and the second opening threshold TH PG2} , It can be set so that a difference in opening degree occurs within a range of 5 to 15 degrees. Further, the lower limit threshold of the second opening degree threshold TH _PG2 can include 0 degrees (fully closed).

In this way, when the operating state of the internal combustion engine 1 is unstable immediately after the internal combustion engine 1 is started, a relatively high first opening degree threshold TH _PG1 is used to reduce the decrease in drivability and the misfire of the internal combustion engine 1. can do. Therefore, in order to ensure the amount of purge, for example, the purge passage 14 or the orifice valve on the purge passage 14 can be enlarged. On the other hand, when the throttle opening exceeds the first opening threshold TH _PG1 and the operating state of the internal combustion engine 1 becomes stable, a relatively low second opening threshold TH _PG2 is used to supply the internal combustion engine 1 from the canister 11. The purge amount of fuel vapor can be secured.

Next, the purge process of this embodiment will be explained with reference to FIGS. 2 and 3. FIG. 2 is a flowchart showing the purge process of this embodiment. The flowchart in FIG. 2 is started when the control unit 20 executes the purge processing program when a start command for the internal combustion engine 1 is received from the user, such as when the user (driver) turns on the ignition. Further, FIG. 3 is a timing chart showing the implementation timing of the purge process. 3(a) shows the implementation timing of the purge process, and FIG. 3(b) shows the time change of the throttle opening [deg] detected by the throttle opening sensor 21. FIG. 3(c) shows the change over time in the engine rotation speed [r/min] detected by the rotation speed sensor 22, and FIG. 3(d) shows the temperature (water temperature or oil temperature) detected by the temperature sensor 23. It shows the change in [°C] over time.

In step S11, the control unit 20 resets the cumulative number of cycles of the internal combustion engine 1. As will be described later, the cumulative number of cycles is determined when the purge process is performed in the internal combustion engine 1 after the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold _THPG1 and the purge process is started. It can be defined as an integrated value (cumulative total) of the number of cycles. In addition, the cycle number is different from the engine rotation speed (engine rotation speed) mentioned above, and is the number of rotations of the internal combustion engine 1 (engine), for example, 1 rotation of the crankshaft in the internal combustion engine 1. It can be defined as a cycle.

In step S12, the control unit 20 sets the throttle opening threshold (opening threshold) to the first opening threshold TH _PG1 . Next, in step S13, the control unit 20 starts the internal combustion engine 1 (engine). Time t ₀ in FIG _. 3 is the time when the internal combustion engine 1 is started, and as shown in FIG. It is set to _PG1 .

In step S14, the control unit 20 determines whether the temperature (water temperature or oil temperature) detected by the temperature sensor 23 exceeds the temperature threshold TW _PG . In the example of FIG. 3(d), at time _t2 , the temperature detected by the temperature sensor 23 exceeds the temperature threshold _TWPG . If the temperature detected by the temperature sensor 23 exceeds the temperature threshold TW _PG , the process advances to step S15. On the other hand, if the temperature detected by the temperature sensor 23 is equal to or lower than the temperature threshold TW _PG , the process proceeds to step S22, and step S14 is repeated without implementing (starting) the purge process. Note that if the process proceeds to step S22 while the purge process is being performed (started), it may be understood that the purge process is stopped (interrupted) in step S22.

In step S15, the control unit 20 determines whether the engine rotation speed detected by the rotation speed sensor 22 exceeds the rotation speed threshold _NEPG . In the example of FIG. 3(b), at time _t1 , the engine rotation speed detected by the rotation speed sensor 22 exceeds the rotation speed threshold _NEPG . If the engine rotation speed detected by the rotation speed sensor 22 exceeds the rotation speed threshold _NEPG , the process proceeds to step S16. On the other hand, if the engine rotation speed detected by the rotation speed sensor 22 is equal to or lower than the rotation speed threshold _NEPG , the process proceeds to step S22, and returns to step S14 without executing (starting) the purge process. Note that if the process proceeds to step S22 while the purge process is being performed (started), it may be understood that the purge process is stopped (interrupted) in step S22.

In step S16, the control unit 20 determines whether the currently set opening threshold is set to the first opening threshold TH _PG1 or the second opening threshold TH _PG2 . If the currently set opening degree threshold is set to the first opening degree threshold TH _PG1 , the process advances to step S17, and if the currently set opening degree threshold value is set to the second opening degree threshold TH _PG2 , the process advances to step S23.

In step S17, the control unit 20 determines whether the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold _THPG1 . In the example of FIG. 3A, at time _t3 , the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold _THPG1 . When the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH _PG1 , the process advances to step S18, and a purge process is performed in step S18. On the other hand, if the throttle opening detected by the throttle opening sensor 21 is less than or equal to the first opening threshold _THPG1 , the process proceeds to step S22, and returns to step S14 without performing the purge process.

In the processing device 100 of this embodiment, the throttle opening exceeds the first opening threshold TH _PG1 , the engine speed exceeds the rotation speed threshold NE _PG , and the temperature (water temperature or oil temperature) exceeds the temperature threshold TW _PG . When it exceeds the threshold value (that is, time t ₃ in FIG. 3), the purge process is executed (started). In this way, by determining whether or not to perform purge processing using the throttle opening, engine speed, and temperature (water temperature or oil temperature) as indicators, purge processing can be performed when the operating state of internal combustion engine 1 has stabilized. It can be implemented. Note that in this embodiment, three indicators are used: throttle opening, engine speed, and temperature (water temperature or oil temperature), but the present invention is not limited to this. The number may be used as an indicator, or the throttle opening degree and temperature may be used as indicators.

In step S19, the control unit 20 increments the cumulative number of cycles of the internal combustion engine 1 (that is, adds 1 to the cumulative number of cycles). Next, in step S20, the control unit 20 determines whether the cumulative number of cycles of the internal combustion engine 1 after the purge process is started (that is, after time t3 in FIG. ₃ ) has reached a predetermined number of cycles. do. The cumulative number of cycles may be understood as the cumulative value of the number of cycles in which purge processing is performed in the internal combustion engine 1 (cumulative number of purge execution cycles). The predetermined number of cycles can be arbitrarily set through experiments, simulations, etc., but for example, even if the throttle opening threshold (opening threshold) is changed from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 . , can be set to a value that allows the purge process to be performed while maintaining the stability of the internal combustion engine 1. If the cumulative number of cycles of the internal combustion engine 1 has not reached the predetermined number of cycles, the process returns to step S14. On the other hand, when the cumulative number of cycles of the internal combustion engine 1 reaches the predetermined number of cycles, the process proceeds to step S21, and in step S21, the opening threshold is changed from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 . Then return to step 14.

Here, in the example of FIG. 3, after the purge process is started (after time _t3 ) and before the cumulative number of cycles of the internal combustion engine 1 reaches the predetermined number of cycles, the throttle opening detected by the throttle opening sensor 21 The opening temporarily becomes less than the first opening threshold _THPG1 , and the purge process is interrupted. During such an interruption period, the cumulative number of cycles of the internal combustion engine 1 is not counted (i.e., incremented), and when the throttle opening exceeds the first opening threshold _THPG1 again, counting of the cumulative number of cycles is restarted. Ru.

Furthermore, in the present embodiment, when the cumulative number of cycles of the internal combustion engine 1 after the start of the purge process reaches a predetermined number of cycles, the opening threshold is changed from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 . The changes have been made, but are not limited to this. For example, even if the opening threshold is changed from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 when the cumulative operating time of the internal combustion engine 1 reaches a predetermined time after the purge process is started, good. The cumulative operating time may be understood as the cumulative value of the driving time during which the internal combustion engine 1 underwent purge processing (purge implementation cumulative operating time). Further, the predetermined time can be arbitrarily set by experiment, simulation, etc., like the predetermined number of cycles, but for example, by changing the opening threshold from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 . can also be set to a value that allows the purge process to be performed while maintaining the stability of the internal combustion engine 1.

After the opening threshold is changed to the second opening threshold _THPG2 in step S20 (that is, after time _t4 in FIG. 3), in step S16, the currently set opening threshold is changed to the second opening threshold TH. It is determined that _PG2 is set, and the process proceeds to step S23. In step S23, the control unit 20 determines whether the throttle opening detected by the throttle opening sensor 21 exceeds the second opening threshold _THPG2 . When the throttle opening detected by the throttle opening sensor 21 exceeds the second opening threshold TH _PG2 , the process proceeds to step S24, and a purge process is performed in step S24. On the other hand, if the throttle opening detected by the throttle opening sensor 21 is less than or equal to the second opening threshold _THPG2 , the process proceeds to step S22, and returns to step S14 without performing the purge process.

In step S24, the control unit 20 determines whether to end the purge process. For example, the control unit 20 can determine to end the purge process when receiving a command to stop the internal combustion engine 1 from the user, such as when the user turns off the ignition. Further, the control unit 20 determines to end the purge process when the cumulative number of cycles in which the purge process is performed reaches the target number of cycles, or when the cumulative operating time in which the purge process is performed reaches the target time. It's okay. If it is determined that the purge process is not to be terminated, the process returns to step S14, and if it is determined that the purge process is to be terminated, the process is terminated. Note that if the internal combustion engine 1 is stopped while the opening threshold is set to the second opening threshold _THPG2 , when the internal combustion engine 1 is restarted, the opening threshold is set to the second opening threshold THPG2 by going through step S12. The second opening threshold TH _PG2 is changed to the first opening threshold TH _PG1 . Further, the target number of cycles may be set to a value greater than the predetermined number of cycles used in step S20, and the target time may be set to a value greater than the predetermined time.

As described above, the processing device 100 of the present embodiment sets the throttle opening threshold (opening threshold) to the first opening threshold THPG1 when starting the internal combustion engine 1, and sets the throttle opening threshold (opening threshold) to the first opening threshold _THPG1 , which is detected by the throttle opening sensor 21. After the throttle opening exceeds the first opening threshold TH _PG1 and the purge process is started, the opening threshold is changed from the first opening threshold TH _PG1 to the second opening threshold TH _PG2 . As a result, when the operating state of the internal combustion engine 1 immediately after starting the internal combustion engine 1 is unstable, a relatively high first opening degree threshold TH _PG1 is used to reduce drivability deterioration and misfire of the internal combustion engine 1. be able to. On the other hand, when the throttle opening exceeds the first opening threshold TH _PG1 and the operating state of the internal combustion engine 1 becomes stable, a relatively low second opening threshold TH _PG2 is used to supply the internal combustion engine 1 from the canister 11. The purge amount of fuel vapor can be secured.

<Second embodiment>
A second embodiment according to the present invention will be described. In the first embodiment, an example has been described in which the first opening threshold TH _PG1 and the second opening threshold TH _PG2 are used as opening thresholds, but three or more types of opening thresholds may be used. For example, as shown in FIG. 4, an initial opening threshold TH _PG0 is set when the internal combustion engine 1 is started, and when the throttle opening detected by the throttle opening sensor 21 exceeds the initial opening threshold TH _PG0 , the internal combustion engine When the cumulative number of cycles in which the purge process was performed in step 1 (the cumulative number of purge execution cycles) reaches the predetermined number of cycles S1, the initial opening threshold TH _PG0 is changed to the first opening threshold TH _PG1 . Then, when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH _PG1 and the purge process is performed in the internal combustion engine 1, the cumulative number of cycles (the cumulative number of purge execution cycles) is a predetermined number of cycles S2. When the opening threshold TH PG1 is reached, the first opening threshold TH _PG1 is changed to the second opening threshold TH _PG2 . The predetermined number of cycles S1 and the predetermined number of cycles S2 may be the same value or may be different values. Note that the second embodiment basically inherits the first embodiment, and matters other than the above are the same as described in the first embodiment. Further, the initial opening threshold TH _PG0 and the first opening threshold TH _PG1 in this embodiment are understood to correspond to the first opening threshold TH _PG1 and the second opening threshold TH _PG2 in the first embodiment, respectively. It's okay. Further, the change in the opening degree threshold value may be determined by combining the accumulated number of purge execution cycles and the accumulated purge execution operating time of the internal combustion engine 1.

<Third embodiment>
A third embodiment according to the present invention will be described. In the first embodiment, an example of changing the throttle opening threshold (opening threshold) has been described, but not only the opening threshold but also the rotation speed threshold NE _PG and/or the temperature threshold TW _PG may be changed. . For example, like the opening threshold, the rotation speed threshold NE _PG is set to the first rotation speed threshold when the internal combustion engine is started, and the cumulative number of cycles of the internal combustion engine 1 after the purge process is started reaches a predetermined number of cycles. or when the cumulative operating time of the internal combustion engine 1 after the purge process is started reaches a predetermined time, the rotation speed threshold _NEPG is changed from the first rotation speed threshold to the second rotation speed threshold. Ru. The second rotation speed threshold may be set to a smaller value than the first rotation speed threshold. Note that the third embodiment basically inherits the first embodiment, and matters other than the above are the same as described in the first embodiment. Furthermore, the second embodiment may be applied to the third embodiment.

<Fourth embodiment>
A fourth embodiment according to the present invention will be described. In the first embodiment, if the internal combustion engine 1 is stopped with the opening threshold set to the second opening threshold _THPG2 , the opening threshold is set to the second opening threshold TH when the internal combustion engine 1 is restarted. An example of changing from _PG2 to the first opening threshold TH _PG1 has been described. In this embodiment, an example will be described in which the opening degree threshold upon restarting the internal combustion engine 1 is set depending on the length of the stop time of the internal combustion engine 1.

For example, if the internal combustion engine 1 is stopped while the opening threshold is set to the second opening threshold _THPG2 , the control unit 20 restarts the internal combustion engine 1 after the internal combustion engine 1 is stopped. Measure the time until (stop time). Then, when the stop time is longer than the predetermined time, the control unit 20 sets (changes) the opening degree threshold at the time of restarting the internal combustion engine 1 to the first opening degree threshold TH _PG1 . On the other hand, if the stop time is less than the predetermined time, the opening threshold when restarting the internal combustion engine 1 is maintained at the second opening threshold _THPG2 . The predetermined time can be arbitrarily set by experiment, simulation, etc., and can be set to a time that can ensure the stability of the operating state of the internal combustion engine 1 when the internal combustion engine 1 is restarted.

In this way, when the stop time of the internal combustion engine 1 is short, the amount of evaporated fuel stored in the canister 11 (charge amount) is small, so even immediately after restarting the internal combustion engine 1, the amount of evaporated fuel stored in the canister 11 is reduced. The amount of fuel vapor (purge amount) supplied to the internal combustion engine 1 does not increase, and the operating condition of the internal combustion engine 1 is stable. Therefore, even if the second opening degree threshold TH _PG2 is maintained when restarting the internal combustion engine 1, there is a low possibility of deterioration of drivability and misfire of the internal combustion engine, and the purge amount is ensured from the time of restarting the internal combustion engine 1. It can be put into a state. Note that the fourth embodiment basically inherits the first embodiment, and matters other than the above are the same as described in the first embodiment. Further, the fourth embodiment may apply the second embodiment and/or the third embodiment.

<Fifth embodiment>
In the above embodiment, an example in which the opening degree threshold value is changed stepwise has been described, but the opening degree threshold value may be changed gradually. For example, as shown in FIG. 5A, when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold _THPG1 and the purge process is started (time _t3 ), The first opening threshold TH _PG1 may be gradually changed (slope-like) to the second opening threshold TH _PG2 . At time _t3 , as in FIG. 3, the throttle opening exceeds the first opening threshold _THPG1 , the engine speed exceeds the rotational speed threshold _NEPG , and the temperature (water temperature or oil temperature) exceeds the temperature threshold TW. It may be understood as the time when _PG is exceeded. Further, as shown in FIG. 5(b), the cumulative cycle of the internal combustion engine 1 after the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold _THPG1 and the purge process is started. When the number reaches a predetermined number of cycles (time t ₄ ), the first opening threshold TH _PG1 may be gradually changed (in a slope shape) to the second opening threshold TH _PG2 . The rate of change of the opening threshold value can be arbitrarily set through experiments, simulations, etc., but for example, if the number of cycles of the internal combustion engine 1 required to change from the first opening threshold value TH _PG1 to the second opening threshold value TH _PG2 is 2. It is preferable to set the value to be at least 5 (preferably 5 or more, more preferably 10 or more). Note that this embodiment may be applied to the first to fourth embodiments. Furthermore, as explained in the third embodiment, when changing the rotation speed threshold NE _PG and/or the temperature threshold TW _PG , the rotation speed threshold NE _PG and/or the temperature threshold TW are changed in the same manner as the opening threshold described above. _PG may be changed gradually.

<Summary of embodiments>
1. The processing device of the above embodiment is
A processing device (e.g. 100) for processing fuel vapor generated in a fuel tank (e.g. 5) of a vehicle, comprising:
a canister (for example 11) that stores the fuel vapor;
an opening degree detection means (for example, 21) that detects the opening degree of a throttle valve (for example, 2) that adjusts the intake amount to the internal combustion engine (for example, E) of the vehicle;
a control means (for example, 20) that executes a purge process to supply the fuel vapor in the canister to the internal combustion engine when the opening detected by the opening detection means exceeds an opening threshold;
Equipped with
The opening threshold is set to a first opening threshold (for example, TH _PG1 ) when the internal combustion engine is started, and when the opening detected by the opening detection means exceeds the first opening threshold, the purge is performed. After the process is started, the opening threshold is changed to a second opening threshold (for example, TH _PG2 ) that is smaller than the first opening threshold.
According to this embodiment, when the operating state of the internal combustion engine is unstable immediately after starting the internal combustion engine, it is possible to reduce the decrease in drivability and the misfire of the internal combustion engine, while on the other hand, when the operating state of the internal combustion engine is stable, At times, it is possible to ensure a purge amount of fuel vapor supplied from the canister to the internal combustion engine.

2. In the above embodiment,
The opening threshold value is such that the cumulative number of cycles of the internal combustion engine reaches a predetermined number of cycles after the opening detected by the opening detection means exceeds the first opening threshold and the purge process is started. In this case, the first opening threshold is changed to the second opening threshold.
According to this embodiment, the throttle opening threshold can be changed from the first opening threshold to the second opening threshold when the operating state of the internal combustion engine is more stable.

3. In the above embodiment,
The cumulative number of cycles is the cumulative number of cycles in which the purge process is performed in the internal combustion engine.
According to this embodiment, since the cumulative number of cycles in which purge processing was actually performed is used as an index, the operating state of the engine and/or the state of the canister can be more accurately understood (estimated), and the control of purge processing can be improved. can be done. In other words, the first opening threshold is changed to the second opening threshold after the purge process has been completed to a certain extent, which reduces drivability and internal combustion engine misfires caused by changing to the second opening threshold. can do. Further, simply measuring the passage of time or temperature changes such as water temperature has not always carried out purge processing in areas where no defects occur, but this embodiment can prevent the occurrence of defects. Note that the state of the canister may be understood as the amount of evaporated fuel (charge amount) stored in the canister 11.

4. In the above embodiment,
The opening threshold value is determined when the cumulative operating time of the internal combustion engine reaches a predetermined time after the opening detected by the opening detection means exceeds the first opening threshold and the purge process is started. In this case, the first opening threshold is changed to the second opening threshold.
According to this embodiment, the throttle opening threshold can be changed from the first opening threshold to the second opening threshold when the operating state of the internal combustion engine is more stable.

5. In the above embodiment,
The cumulative operating time is an integrated value of the driving time during which the purge process was performed in the internal combustion engine.
According to this embodiment, since the accumulated value of the operating time during which purge processing was actually performed is used as an index, the operating state of the engine and/or the state of the canister can be more accurately grasped (estimated), and the purge processing can be controlled. can be improved. In other words, the first opening threshold is changed to the second opening threshold after the purge process has been completed to a certain extent, which reduces drivability and internal combustion engine misfires caused by changing to the second opening threshold. can do. Further, simply measuring the passage of time or temperature changes such as water temperature does not necessarily result in purge processing in areas where no defects occur, but this embodiment can prevent the occurrence of defects. Note that the state of the canister may be understood as the amount of evaporated fuel (charge amount) stored in the canister 11.

6. In the above embodiment,
If the internal combustion engine is stopped while the opening threshold is set to the second opening threshold, the opening threshold changes from the second opening threshold to the first opening threshold when the internal combustion engine is restarted. degree threshold.
According to this embodiment, when the internal combustion engine is restarted, a decrease in drivability and a misfire of the internal combustion engine can be reduced.

7. In the above embodiment,
If the time from when the internal combustion engine is stopped until the internal combustion engine is restarted with the opening threshold set to the second opening threshold is less than a predetermined time, the internal combustion engine is restarted. The opening degree threshold at the time of starting is maintained at the second opening degree threshold.
According to this embodiment, when the stop time of the internal combustion engine is short, the operating state of the internal combustion engine is stable even immediately after restarting the internal combustion engine, so when the internal combustion engine is restarted, the second opening is performed. Even if the opening degree threshold value is maintained, deterioration in drivability and misfire of the internal combustion engine can be reduced, and by using the second opening degree threshold value, the purge amount can be ensured.

8. In the above embodiment,
Further comprising a rotation speed detection means (for example, 22) for detecting the rotation speed of the internal combustion engine,
The control means is configured such that the opening detected by the opening detection means exceeds the opening threshold, and the rotation speed detected by the rotation speed detection means is a rotation speed threshold (for example, NE _PG ). , the purge process is executed.
According to this embodiment, the purge process can be performed when the operating condition of the internal combustion engine is more stable, so that deterioration in drivability and misfire of the internal combustion engine can be reduced.

9. In the above embodiment,
The rotation speed threshold is set to a first rotation speed threshold when the internal combustion engine is started, and the purge process is started when the rotation speed detected by the rotation speed detection means exceeds the first rotation speed threshold. Thereafter, the rotation speed threshold is changed to a second rotation speed threshold that is smaller than the first rotation speed threshold.
According to this embodiment, when the operating state of the internal combustion engine is unstable immediately after starting the internal combustion engine, it is possible to reduce the decrease in drivability and the misfire of the internal combustion engine, while on the other hand, when the operating state of the internal combustion engine is stable, At times, it is possible to ensure a purge amount of fuel vapor supplied from the canister to the internal combustion engine.

10. In the above embodiment,
Temperature detection means (for example, 23) for detecting the temperature of cooling water or oil flowing through the internal combustion engine,
The control means is configured such that after the internal combustion engine is started, the opening degree detected by the opening degree detection means exceeds the opening degree threshold value, and the temperature detected by the temperature detection means exceeds a temperature threshold value ( For example, if it exceeds TW _PG ), the purge process is executed.
According to this embodiment, the purge process can be performed when the operating condition of the internal combustion engine is more stable, so that deterioration in drivability and misfire of the internal combustion engine can be reduced.

11. In the above embodiment,
Further comprising a communication passage (for example, 14) that communicates the canister and the internal combustion engine, and a purge control valve (for example, 15) that opens and closes the communication passage,
The control means controls the purge process by controlling the purge control valve.
According to this embodiment, purge processing can be performed appropriately.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention.

1: Internal combustion engine, 2: Throttle body (throttle valve), 3: Air cleaner, 5: Fuel tank, 14: Purge passage, 15: Purge control valve, 20: Control section, 21: Throttle opening sensor, 22: Rotation speed Sensor, 23: Temperature sensor, 100: Processing device

Claims (16)

A processing device for processing fuel vapor generated in a fuel tank of a vehicle, the processing device comprising:
a canister that stores the fuel vapor;
Opening degree detection means for detecting the opening degree of a throttle valve that adjusts the amount of air intake into the internal combustion engine of the vehicle;
control means for executing a purge process for supplying the fuel vapor in the canister to the internal combustion engine when the opening detected by the opening detection means exceeds an opening threshold;
Equipped with
The opening threshold is set to a first opening threshold when the internal combustion engine is started, and the purge process is started when the opening detected by the opening detection means exceeds the first opening threshold. and then changed to a second opening threshold that is smaller than the first opening threshold ,
The processing apparatus according to claim 1, wherein the second opening threshold is set so that the purge process is not performed when the opening detected by the opening detection means is 0 degrees . The opening threshold value is such that the cumulative number of cycles of the internal combustion engine reaches a predetermined number of cycles after the opening detected by the opening detection means exceeds the first opening threshold and the purge process is started. 2. The processing device according to claim 1, wherein the first opening degree threshold value is changed to the second opening degree threshold value when the opening degree threshold value is changed to the second opening degree threshold value. The processing device according to claim 2, wherein the cumulative number of cycles is a cumulative value of the number of cycles in which the purge process is performed in the internal combustion engine. The opening threshold value is determined when the cumulative operating time of the internal combustion engine reaches a predetermined time after the opening detected by the opening detection means exceeds the first opening threshold and the purge process is started. 2. The processing device according to claim 1, wherein the first opening threshold is changed to the second opening threshold when the opening threshold is opened. 5. The processing device according to claim 4, wherein the cumulative operating time is a cumulative value of the driving time during which the purge process was performed in the internal combustion engine. If the internal combustion engine is stopped while the opening threshold is set to the second opening threshold, the opening threshold changes from the second opening threshold to the first opening threshold when the internal combustion engine is restarted. 6. The processing device according to claim 1, wherein the processing device is changed to a threshold value. If the time from when the internal combustion engine is stopped until the internal combustion engine is restarted with the opening threshold set to the second opening threshold is less than a predetermined time, the internal combustion engine is restarted. 7. The processing device according to claim 1, wherein the opening degree threshold at the time of startup is maintained at the second opening degree threshold. Further comprising a rotation speed detection means for detecting the rotation speed of the internal combustion engine,
When the opening detected by the opening detection means exceeds the opening threshold, and the rotation speed detected by the rotation speed detection means exceeds the rotation speed threshold, The processing apparatus according to any one of claims 1 to 7, wherein the purge process is executed at a time when the purge process is performed. The rotation speed threshold is set to a first rotation speed threshold when the internal combustion engine is started, and the purge process is started when the rotation speed detected by the rotation speed detection means exceeds the first rotation speed threshold. 9. The processing device according to claim 8, wherein the rotation speed threshold is then changed to a second rotation speed threshold that is smaller than the first rotation speed threshold. comprising temperature detection means for detecting the temperature of cooling water or oil flowing through the internal combustion engine,
The control means is configured such that after the internal combustion engine is started, the opening detected by the opening detection means exceeds the opening threshold, and the temperature detected by the temperature detection means exceeds the temperature threshold. The processing apparatus according to any one of claims 1 to 9, wherein the purge process is executed when the amount exceeds the limit. further comprising a communication passage that communicates the canister and the internal combustion engine, and a purge control valve that opens and closes the communication passage,
11. The processing apparatus according to claim 1, wherein the control means controls the purge process by controlling the purge control valve. 12. The processing device according to claim 1, wherein the second opening degree threshold is set to a value of 0 degrees or more. A processing device for processing fuel vapor generated in a fuel tank of a vehicle, the processing device comprising:
a canister that stores the fuel vapor;
Opening degree detection means for detecting the opening degree of a throttle valve that adjusts the amount of air intake into the internal combustion engine of the vehicle;
control means for executing a purge process for supplying the fuel vapor in the canister to the internal combustion engine when the opening detected by the opening detection means exceeds an opening threshold;
Equipped with
The opening threshold is set to a first opening threshold when the internal combustion engine is started, and the purge process is started when the opening detected by the opening detection means exceeds the first opening threshold. and then changed to a second opening threshold that is smaller than the first opening threshold,
If the time from when the internal combustion engine is stopped until the internal combustion engine is restarted with the opening threshold set to the second opening threshold is less than a predetermined time, the internal combustion engine is not restarted. A processing device characterized in that the opening degree threshold at the time of startup is maintained at the second opening degree threshold. a fuel tank for storing fuel;
A vehicle comprising the processing device according to any one of claims 1 to 13 . A treatment method for treating fuel vapor generated in a fuel tank of a vehicle, the method comprising:
storing the fuel vapor in a canister;
performing a purge process for supplying the fuel vapor in the canister to the internal combustion engine when the opening degree of a throttle valve that adjusts the intake amount to the internal combustion engine of the vehicle exceeds an opening degree threshold;
including;
The opening threshold is set to a first opening threshold when the internal combustion engine is started, and after the opening of the throttle valve exceeds the first opening threshold and the purge process is started, the opening threshold is set to the first opening threshold. The opening degree threshold is changed to a second opening degree threshold that is smaller than the degree threshold value .
The processing method is characterized in that the second opening degree threshold is set so that the purge process is not performed when the opening degree is 0 degrees . A program for causing a computer to execute the processing method according to claim 15 .