Processing device, vehicle, processing method, and storage medium

Abstract

This invention relates to a processing apparatus, a vehicle, a processing method, and a storage medium, capable of appropriately supplying fuel vapor stored in an adsorption tank to an internal combustion engine. The processing apparatus processes fuel vapor generated in a vehicle's fuel tank and includes: an adsorption tank for storing the fuel vapor; an opening detection unit for detecting the opening of a throttle valve used to adjust the intake air volume to the vehicle's internal combustion engine; and a control unit that performs a purging process when the opening detected by the opening detection unit exceeds an opening threshold, wherein the fuel vapor in the adsorption tank is supplied to the internal combustion engine during the purging process, the opening threshold being set as a first opening threshold when the internal combustion engine is started, and changed to a second opening threshold smaller than the first opening threshold after the opening detected by the opening detection unit exceeds the first opening threshold and the purging process begins.

Description

Technical Field

[0001] This invention relates to a processing apparatus, a vehicle, a processing method, and a storage medium. Background Technology

[0002] Patent document 1 discloses a technology for supplying fuel vapor stored in an adsorption tank to an internal combustion engine for combustion treatment, namely the so-called adsorption tank purge control (purge treatment).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-211564 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] For example, the purging process can be performed when the throttle valve opening exceeds a threshold value, using the throttle valve opening as an indicator. This throttle valve is used to adjust the intake air volume to the internal combustion engine. In this case, based on the viewpoint of ensuring the amount of fuel vapor (purging amount) supplied from the adsorption canister to the internal combustion engine, this threshold value can be set low, so that purging is performed even when the throttle valve opening is small. However, for example, if the adsorption canister is fully filled, starting purging with a small throttle valve opening may result in an excessive amount of fuel vapor supplied to the internal combustion engine (overly rich), potentially leading to reduced driving performance (DR) or misfire in the internal combustion engine.

[0008] Therefore, the object of the present invention is to provide a technique for properly supplying fuel vapor stored in an adsorption tank to an internal combustion engine.

[0009] Solution for solving the problem

[0010] To achieve the above objectives, one aspect of the present invention is a processing apparatus for processing fuel vapor generated in a vehicle's fuel tank. The processing apparatus is characterized by comprising: an adsorption tank for storing the fuel vapor; an opening detection unit for detecting the opening of a throttle valve used to adjust the intake air volume to the vehicle's internal combustion engine; and a control unit that performs a purging process when the opening detected by the opening detection unit exceeds an opening threshold. In the purging process, the fuel vapor in the adsorption tank is supplied to the internal combustion engine. When the internal combustion engine is started, the opening threshold is set to a first opening threshold. After the opening detected by the opening detection unit exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold smaller than the first opening threshold.

[0011] To achieve the above objectives, one aspect of the present invention is a method for treating fuel vapor generated in a vehicle's fuel tank, characterized by comprising: storing the fuel vapor in an adsorption tank; and performing a purging process, wherein, in the purging process, when the opening degree of the throttle valve exceeds an opening threshold, the fuel vapor in the adsorption tank is supplied to an internal combustion engine, the throttle valve being used to adjust the intake volume of the internal combustion engine of the vehicle, the opening threshold being set to a first opening threshold when the internal combustion engine is started, and after the opening degree of the throttle valve exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold smaller than the first opening threshold.

[0012] The effects of the invention

[0013] According to the present invention, for example, it is possible to provide a technique that can properly supply fuel vapor stored in an adsorption tank to an internal combustion engine. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing an example of the structure of the processing apparatus according to the first embodiment.

[0015] Figure 2 This is a flowchart illustrating the purging process of the first embodiment.

[0016] Figure 3 This is a timing diagram showing the timing of the purging process implemented in the first embodiment.

[0017] Figure 4 This is a graph showing the time variation of throttle opening and the opening threshold in the second embodiment.

[0018] Figure 5 This is a graph showing the time variation of throttle opening and the opening threshold in the fifth embodiment.

[0019] Explanation of reference numerals in the attached figures

[0020] 1: Internal combustion engine; 2: Throttle body (throttle valve); 3: Air filter; 5: Fuel tank; 14: Purge passage; 15: Purge control valve; 20: Control unit; 21: Throttle opening sensor; 22: Speed ​​sensor; 23: Temperature sensor; 100: Processing device. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and also includes modifications and variations of the structure within the scope of the present invention. Furthermore, the present invention does not require a combination of all the features described in this embodiment. Moreover, the same structural elements are given the same reference numerals, and their descriptions are omitted.

[0022] <First Implementation Method>

[0023] The first embodiment of the present invention will be described. Figure 1 This is a schematic diagram showing a structural example of the processing device 100 according to this embodiment. The processing device 100 is a device for processing fuel vapor generated in the fuel tank of a vehicle. The vehicle equipped with the processing device 100 can be a two-wheeled motor vehicle, a tricycle, or a four-wheeled vehicle. The vehicle is equipped with an internal combustion engine 1 (engine). Outside air is introduced into the internal combustion engine 1 from the air filter (AC) 3 via the throttle body (THB) 2, which constitutes the intake system. The throttle body 2 includes a throttle valve, which is used to adjust the amount of air intake into the internal combustion engine 1. In addition, an injector 4, which is a fuel injection device, is installed in the internal combustion engine 1, and fuel is injected into the combustion chamber of the internal combustion engine 1 by the injector 4.

[0024] One end of the fuel supply passage 6, which supplies fuel from the fuel tank 5 containing gasoline or other fuels, is connected to the injector 4. 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 activated, the liquid fuel in the fuel tank 5 is pressurized and delivered to the injector 4 via the fuel supply passage 6.

[0025] The fuel filler cap 8 is installed at the upper opening of the fuel tank 5 in a freely opening and closing manner. A gas-liquid separation unit 9 is integrally installed on the fuel filler cap 8. This gas-liquid separation unit 9 uses a labyrinth structure or the like to separate the evaporated fuel (gas phase) from the unevaporated fuel (liquid phase). This gas-liquid separation unit 9 is, for example, formed in a ring shape, with one end of the filling passage 10 connected to the gas phase section that only introduces the evaporated fuel. The filling passage 10 is a passage connecting the fuel tank 5 to the adsorption tank 11 that stores the evaporated fuel.

[0026] A discharge (D) passage 12 for discharging liquid fuel flowing into the adsorption tank 11, an atmosphere opening passage 13 for opening the adsorption tank 11 to the atmosphere (A), and a purge passage 14 (connection passage) connecting the adsorption tank 11 to the throttle body 2 (internal combustion engine 1) are respectively connected to the adsorption tank 11. A purge control valve 15 is provided in the purge passage 14, which opens and closes the connection between the adsorption tank 11 and the throttle body 2 according to a control signal from the control unit 20. As the purge control valve 15, for example, an on / off valve, a duty cycle control valve (including a valve whose valve diameter can be arbitrarily adjusted), etc., can be used, but it is not limited to these; various types of control valves can be used.

[0027] The adsorption tank 11 contains adsorption elements such as activated carbon. When a gas containing a relatively high concentration of fuel vapor is introduced through the filling passage 10, the fuel vapor contained in the gas is adsorbed and stored in the adsorption elements. In addition, by opening the purge control valve 15, when the intake negative pressure generated by the operation of the internal combustion engine 1 is applied to the adsorption tank 11 through the purge passage 14, a gas with a low concentration of fuel vapor (e.g., air) is introduced into the adsorption tank 11 through the atmospheric opening passage 13, and the fuel vapor adsorbed in the adsorption elements is supplied to the purge passage 14.

[0028] Based on the detection results of various sensors, the control unit 20 controls the purging process, in which fuel vapor stored in the adsorption tank 11 is supplied (purged) to the internal combustion engine 1 via the throttle body 2 or its downstream intake passage. The control unit 20 is, for example, an ECU (Electronic Control Unit), which can be configured as a computer including a processor (such as a CPU), a storage device such as semiconductor memory, and an interface with external devices. In this embodiment, the control unit 20 stores an application program (hereinafter sometimes referred to as a purging process program) for performing the purging process in its storage device (memory). The processor of the control unit 20 can read and execute the purging process program stored in the storage device. Here, the purging process program is stored on a storage medium such as a CD-ROM or DVD, and can be installed to the control unit 20 from this storage medium, or downloaded and installed to the control unit 20 from an external server via a network.

[0029] As various sensors, throttle opening sensor 21 (opening detection unit), speed sensor 22 (speed detection unit), and temperature sensor 23 (temperature detection unit) are connected to the control unit 20. Throttle opening sensor 21 is a sensor that detects the opening degree (throttle opening) of the throttle valve installed on the throttle body 2. Speed ​​sensor 22 is a sensor that detects the speed (engine speed) of the internal combustion engine 1. Temperature sensor 23 is a sensor that detects the temperature (water temperature or oil temperature) of the coolant or oil flowing in the internal combustion engine 1. The control unit 20 sequentially acquires information detected by the throttle opening sensor 21, speed sensor 22, and temperature sensor 23, and controls the purge control valve 15 based on this information, thereby controlling the purge process. Alternatively, throttle opening sensor 21 may be a negative pressure sensor that detects the negative pressure in the intake manifold. Furthermore, the speed (engine speed) of the internal combustion engine 1 may be understood as the rotational speed of the internal combustion engine 1.

[0030] Using throttle opening as an indicator, purging can be performed when the throttle opening exceeds a threshold. In this case, based on the viewpoint of ensuring the amount of fuel vapor (purging amount) supplied from the adsorption canister 11 to the internal combustion engine 1, this threshold can be set to a low value so that purging is performed even when the throttle opening is small. However, for example, if the adsorption canister 11 is fully filled, when purging begins with a small throttle opening, the amount of fuel vapor supplied to the internal combustion engine 1 may be excessive (too rich), which may lead to a decrease in driving performance (DR) or misfire of the internal combustion engine 1.

[0031] Therefore, in the processing apparatus 100 of this embodiment, the first opening threshold TH is used as the threshold value (opening threshold) for the throttle opening degree to perform the purging process. PG1 And the first opening threshold TH PG1 Small second opening threshold TH PG2 Furthermore, when the internal combustion engine 1 starts, the opening threshold is set to the first opening threshold TH. PG1 When the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH PG1 After the purging process begins, the aperture threshold changes from the first aperture threshold TH. PG1 It was changed to the second opening threshold TH PG2 The first opening threshold TH can be arbitrarily set through experiments, simulations, etc. PG1 and the second opening threshold TH PG2 For example, it can be set as the first opening threshold TH. PG1 With the second opening threshold TH PG2 The difference in opening degree between them is within the range of 5 to 15 degrees. Additionally, the second opening degree threshold TH... PG2The lower threshold can include 0 degrees (fully closed).

[0032] Thus, when the operation of the internal combustion engine 1 is unstable immediately after its start, a relatively high first opening threshold TH is used. PG1 This reduces the decrease in driving performance and misfire of the internal combustion engine 1. Therefore, to ensure the purge volume, the purge passage 14 or the throttle valve on the purge passage 14 can be enlarged, for example. On the other hand, when the throttle opening exceeds the first opening threshold TH... PG1 Furthermore, when the internal combustion engine 1 is operating stably, a relatively low second opening threshold TH is used. PG2 This ensures the amount of fuel vapor supplied from the adsorption tank 11 to the internal combustion engine 1 for purging.

[0033] Then, refer to Figures 2-3 The purging process described in this embodiment is explained. Figure 2 This is a flowchart illustrating the purging process of this embodiment. For example, when the user (driver) turns on the ignition device, upon receiving a start command for the internal combustion engine 1 from the user, the control unit 20 initiates the purging process. Figure 2 The flowchart. Additionally. Figure 3 This is a timing diagram showing the timing of the purging process. Figure 3 (a) shows the timing of the purging process. Figure 3 (b) shows the time variation of throttle opening [deg] detected by throttle opening sensor 21. Figure 3 (c) shows the time variation of engine speed [r / min] detected by speed sensor 22. Figure 3 (d) shows the time change of temperature (water temperature or oil temperature) [°C] detected by temperature sensor 23.

[0034] In step S11, the control unit 20 resets the cumulative stroke count of the internal combustion engine 1. As will be described later, the cumulative stroke count can be defined as: when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH. PG1 After the purging process begins, the cumulative number of strokes in which the purging process is performed in the internal combustion engine 1 is (cumulative). In addition, the number of strokes is different from the engine speed (rotation speed of the engine) mentioned above. It is the number of times that the internal combustion engine 1 (engine) can rotate. For example, two rotations of the crankshaft of the internal combustion engine 1 are defined as one stroke.

[0035] In step S12, the control unit 20 sets the throttle opening threshold (opening threshold) to the first opening threshold TH. PG1 Then, in step S13, the control unit 20 starts the internal combustion engine 1 (engine). Figure 3 The time t0 in the equation is when internal combustion engine 1 starts, such as... Figure 3As shown in (b), when the internal combustion engine 1 starts (time t0), the opening threshold is set to the first opening threshold TH. PG1 .

[0036] 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 .exist Figure 3 In example (d), at time t2, the temperature detected by temperature sensor 23 exceeds the temperature threshold TW. PG When the temperature detected by temperature sensor 23 exceeds the temperature threshold TW PG If the temperature detected by temperature sensor 23 is the temperature threshold TW, proceed to step S15. PG In the following cases, proceed to step S22, repeat step S14 without performing (start) purging treatment. Moreover, it can be understood that if step S22 is performed while purging treatment is being carried out, the purging treatment is stopped (interrupted) in step S22.

[0037] In step S15, the control unit 20 determines whether the engine speed detected by the speed sensor 22 exceeds the speed threshold NE. PG .exist Figure 3 In example (c), at time t1, the engine speed detected by speed sensor 22 exceeds the speed threshold NE. PG When the engine speed detected by speed sensor 22 exceeds the speed threshold NE PG If the engine speed detected by the speed sensor 22 is the speed threshold NE, proceed to step S16. PG In the following cases, proceed to step S22, do not perform (start) purging process, and return to step S14. Moreover, it can be understood that if you proceed to step S22 while performing (start) purging process, stop (interrupt) purging process in step S22.

[0038] In step S16, the control unit 20 determines that the currently set opening threshold is set to the first opening threshold TH. PG1 It was still set to the second opening threshold TH. PG2 Alright. The currently set opening threshold is set to the first opening threshold TH. PG1 In the case of S17, the process proceeds to step S17, where the second opening threshold TH is set. PG2 If the condition is met, proceed to step S23.

[0039] In step S17, the control unit 20 determines whether the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH. PG1 .exist Figure 3In example (b), at time t3, the throttle opening detected by throttle opening sensor 21 exceeds the first opening threshold TH. PG1 When the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH... PG1 If the condition is met, proceed to step S18, where a purging process is performed. On the other hand, if the throttle opening detected by the throttle opening sensor 21 is the first opening threshold TH... PG1 In the following cases, proceed to step S22, do not perform purging, and return to step S14.

[0040] In the processing apparatus 100 of this embodiment, when the throttle opening exceeds the first opening threshold TH... PG1 Engine speed exceeds speed threshold NE PG And the temperature (water temperature or oil temperature) exceeds the temperature threshold TW PG The situation (i.e.) Figure 3 At time t3, a purging process is initiated. Thus, by using throttle opening, engine speed, and temperature (water temperature or oil temperature) as indicators to determine whether purging is necessary, purging can be performed when the internal combustion engine 1 is operating stably. Furthermore, while this embodiment uses three indicators—throttle opening, engine speed, and temperature (water temperature or oil temperature)—it is not limited to these. It is also possible to use only throttle opening as an indicator, to use both throttle opening and engine speed as indicators, or to use both throttle opening and temperature as indicators.

[0041] In step S19, the control unit 20 increments the cumulative stroke count of the internal combustion engine 1 (i.e., increments the cumulative stroke count by one). Then, in step S20, the control unit 20 determines that after the purging process has started (i.e., Figure 3 Whether the cumulative number of strokes of the internal combustion engine 1 after time t3 has reached the predetermined number of strokes. Alternatively, the cumulative number of strokes can be understood as the cumulative value of the number of strokes in the internal combustion engine 1 that are used for purging (cumulative number of strokes used for purging). The predetermined number of strokes can be arbitrarily set through experiments, simulations, etc., but for example, it can be set to a value such that even if the threshold of throttle opening (opening threshold) is changed from the first opening threshold TH PG1 Change to the second opening threshold TH PG2 This allows for purging while maintaining the stability of the internal combustion engine 1. If the cumulative stroke count of the internal combustion engine 1 does not reach a predetermined stroke count, the process returns to step S14. Conversely, if the cumulative stroke count of the internal combustion engine 1 reaches a predetermined stroke count, the process proceeds to step S21, where the opening threshold is adjusted from the first opening threshold TH. PG1 Change to the second opening threshold TH PG2 Then return to step S14.

[0042] Here, in Figure 3 In the example, after the purging process begins (after time t3) and before the cumulative number of strokes of the internal combustion engine 1 reaches the predetermined number of strokes, the throttle opening detected by the throttle opening sensor 21 is temporarily set at the first opening threshold TH. PG1 The purging process is then interrupted. During this interruption, the cumulative stroke count of the internal combustion engine 1 is not counted (i.e., incremented) until the throttle opening exceeds the first opening threshold TH again. PG1 In this case, the counting of the cumulative strokes will resume.

[0043] Furthermore, in this embodiment, when the cumulative number of strokes of the internal combustion engine 1 after the start of the purging process reaches a predetermined number of strokes, the opening threshold is changed from the first opening threshold TH. PG1 Change to the second opening threshold TH PG2 However, it is not limited to this. For example, it could also be that, if the cumulative operating time of the internal combustion engine 1 after the start of the purging process reaches a predetermined time, the opening threshold is lowered from the first opening threshold TH. PG1 Change to the second opening threshold TH PG2 Alternatively, the cumulative operating time can be understood as the cumulative value of the operating time during the purging process in the internal combustion engine 1 (cumulative operating time of purging implementation). Furthermore, similar to the predetermined number of strokes, the predetermined time can be arbitrarily set through experiments, simulations, etc., but for example, it can be set to a value such that even if the opening threshold is changed from the first opening threshold TH... PG1 Change to the second opening threshold TH PG2 It can also perform purging treatment while maintaining the stability of the internal combustion engine 1.

[0044] In step S21, the opening threshold is changed to the second opening threshold TH. PG2 After that (i.e., Figure 3 In step S16 (after time t4), it is determined that the currently set opening threshold is set to the second opening threshold TH. PG2 Then proceed 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 TH. PG2 When the throttle opening detected by the throttle opening sensor 21 exceeds the second opening threshold TH... PG2 If the condition is met, proceed to step S24, where a purging process is performed. On the other hand, if the throttle opening detected by the throttle opening sensor 21 is the second opening threshold TH... PG2 In the following cases, proceed to step S22, do not perform purging, and return to step S14.

[0045] In step S25, the control unit 20 determines whether to end the purging process. For example, if the user disconnects the ignition device, or if the control unit 20 receives a stop command from the user for the internal combustion engine 1, it can determine that the purging process should end. Alternatively, the control unit 20 may determine that the purging process should end when the cumulative number of strokes during the purging process reaches a target number of strokes, or when the cumulative operating time during the purging process reaches a target time. If it is determined that the purging process should not end, the process returns to step S14; if it is determined that the purging process should end, the purging process ends. Furthermore, the opening threshold is set to the second opening threshold TH. PG2 When the internal combustion engine 1 is stopped in the current state, upon restarting the internal combustion engine 1, after the aforementioned step S12, the opening threshold is changed from the second opening threshold TH. PG2 It was changed to the first opening threshold TH PG1 Additionally, the target number of strokes can be set to a value larger than the predetermined number of strokes used in step S20, and the target time can be set to a value larger than the predetermined time.

[0046] As described above, the processing device 100 of this embodiment sets the throttle opening threshold (opening threshold) to a first opening threshold TH when the internal combustion engine 1 is started. PG1 When the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH PG1 After starting the purging process, the opening threshold is set from the first opening threshold TH. PG1 Change to the second opening threshold TH PG2 Therefore, when the operation of the internal combustion engine 1 is unstable immediately after its start, a relatively high first opening threshold TH is used. PG1 This reduces the decrease in driving performance and the misfire of the internal combustion engine. On the other hand, when the throttle opening exceeds the first opening threshold TH... PG1 Furthermore, when the internal combustion engine 1 is operating stably, a relatively low second opening threshold TH is used. PG2 This ensures the amount of fuel vapor supplied from the adsorption tank 11 to the internal combustion engine 1 for purging.

[0047] <Second Implementation Method>

[0048] The second embodiment of the present invention will be described. In the first embodiment, a first opening threshold TH was described. PG1 and the second opening threshold TH PG2 This can be used as an example of an opening threshold, but more than three opening thresholds can also be used. For example, such as Figure 4 As shown, the initial opening threshold TH is set when the internal combustion engine 1 starts. PG0 When the throttle opening detected by the throttle opening sensor 21 exceeds the initial opening threshold THPG0 When the cumulative number of strokes for purging treatment in internal combustion engine 1 (cumulative number of strokes for purging treatment) reaches a predetermined number of strokes S1, the initial opening threshold TH is used. PG0 It was changed to the first opening threshold TH PG1 Furthermore, when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH... PG1 When the cumulative number of strokes for purging treatment in the internal combustion engine 1 (cumulative number of strokes for purging treatment) reaches a predetermined number of strokes S2, the first opening threshold TH is used. PG1 It was changed to the second opening threshold TH PG2 The predetermined number of strokes S1 and S2 can be the same or different values. Furthermore, the second embodiment basically inherits from the first embodiment, except for the matters described above, as explained in the first embodiment. Alternatively, the initial opening threshold TH of this embodiment can be... PG0 and the first opening threshold TH PG1 This is understood as the first opening threshold TH of the first embodiment. PG1 and the second opening threshold TH PG2 The corresponding values ​​are respectively. Alternatively, the change in the opening threshold can be determined by combining the cumulative number of strokes and the cumulative operating time of the purging process of the internal combustion engine 1.

[0049] <Third Implementation Method>

[0050] The third embodiment of the present invention will be described. In the first embodiment, an example of changing the threshold value of the throttle opening (opening threshold value) was described, but not only the opening threshold value can be changed, but the engine speed threshold value NE can also be changed. PG and / or temperature threshold TW PG For example, similar to the opening threshold, the rotational speed threshold NE PG The first speed threshold NE is set when the internal combustion engine starts. This threshold is adjusted when the cumulative number of strokes of the internal combustion engine 1 after the start of the purging process reaches a predetermined number of strokes, or when the cumulative operating time of the internal combustion engine 1 after the start of the purging process reaches a predetermined time. PG The first speed threshold is changed to a second speed threshold. The second speed threshold can be set to a value smaller than the first speed threshold. Furthermore, the third embodiment basically inherits from the first embodiment, except for the matters described above, as explained in the first embodiment. Alternatively, the third embodiment may apply the second embodiment.

[0051] <Fourth Implementation Method>

[0052] The fourth embodiment of the present invention will be described. In the first embodiment, an example is described where the opening threshold is set to a second opening threshold TH. PG2 When the internal combustion engine 1 is stopped under the condition of being stopped, the opening threshold will be changed from the second opening threshold TH when the internal combustion engine 1 is restarted. PG2 Change to the first opening threshold TH PG1 In this embodiment, the following example is described: the opening threshold of the internal combustion engine 1 when restarting is set according to the length of the stopping time of the internal combustion engine 1.

[0053] For example, when the opening threshold is set to the second opening threshold TH PG2 When the internal combustion engine 1 stops, the control unit 20 measures the time from when the internal combustion engine 1 stops until it restarts (stop time). Furthermore, if the stop time is longer than a predetermined time, the control unit 20 sets (changes) the opening threshold for restarting the internal combustion engine 1 to a first opening threshold TH. PG1 On the other hand, if the stopping time is less than a predetermined time, the opening threshold of the internal combustion engine 1 during restart is maintained at the second opening threshold TH. PG2 It is possible to set a predetermined time arbitrarily through experiments, simulations, etc., but it can be set to a time that ensures the stability of the operating state of the internal combustion engine 1 when it restarts.

[0054] Thus, when the stopping time of the internal combustion engine 1 is short, the amount of evaporated fuel stored in the adsorption tank 11 (charge amount) is small. Therefore, even after the internal combustion engine 1 is restarted immediately, the amount of fuel vapor supplied from the adsorption tank 11 to the internal combustion engine 1 (purge amount) will not increase, and the operating state of the internal combustion engine 1 remains stable. Therefore, even when the internal combustion engine 1 is restarted, the second opening threshold TH is maintained. PG2 This also reduces the likelihood of decreased driving performance and internal combustion engine misfire, ensuring sufficient purging from the moment the internal combustion engine 1 is restarted. Furthermore, the fourth embodiment essentially inherits from the first embodiment, except for the aforementioned aspects, as described in the first embodiment. Alternatively, the fourth embodiment may apply the second and / or third embodiments.

[0055] <Fifth Implementation Method>

[0056] In the above embodiments, an example of changing the opening threshold in a step-like manner was described, but it is also possible to change the opening threshold gradually. For example, it could also be as follows: Figure 5 As shown in (a), when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH PG1 And when the purging process begins (time t3), from the first opening threshold TH PG1Gradually (in a sloping manner) towards the second opening threshold TH PG2 Change. It could also be, with Figure 3 Similarly, time t3 can be understood as the throttle opening exceeding the first opening threshold TH. PG1 Engine speed exceeds speed threshold NE PG And the temperature (water temperature or oil temperature) exceeds the temperature threshold TW PG The moment. Alternatively, it could be, such as... Figure 5 As shown in (b), when the throttle opening detected by the throttle opening sensor 21 exceeds the first opening threshold TH PG1 And when the cumulative number of strokes of the internal combustion engine 1 after the purging process reaches the predetermined number of strokes (time t4), from the first opening threshold TH PG1 Gradually (in a sloping manner) towards the second opening threshold TH PG2 Change. The rate of change of the opening threshold can be arbitrarily set through experiments, simulations, etc., but it can be, for example, set to, start from the first opening threshold TH. PG1 To the second opening threshold TH PG2 The number of strokes of the internal combustion engine 1 required for the change is 2 or more (preferably 5 or more, more preferably 10 or more). Furthermore, this embodiment can also be applied to the first to fourth embodiments. Alternatively, as explained in the third embodiment, when changing the speed threshold NE... PG and / or temperature threshold TW PG In the same manner as the opening threshold mentioned above, the rotational speed threshold NE is gradually changed. PG and / or temperature threshold TW PG .

[0057] <Summary of Implementation Methods>

[0058] 1. The processing apparatus of the above embodiment is a processing apparatus (e.g., 100) for processing fuel vapor generated in a vehicle's fuel tank (e.g., 5), and the processing apparatus includes:

[0059] An adsorption tank (e.g., 11) is used to store the fuel vapor;

[0060] An opening detection unit (e.g., 21) detects the opening of a throttle valve (e.g., 2), which adjusts the intake air volume to the internal combustion engine (e.g., E) of the vehicle; and

[0061] A control unit (e.g., 20) performs a purging process when the opening degree detected by the opening degree detection unit exceeds an opening degree threshold. During this purging process, the fuel vapor in the adsorption tank is supplied to the internal combustion engine.

[0062] When the internal combustion engine starts, the opening threshold is set to a first opening threshold (e.g., TH). PG1 After the aperture detected by the aperture detection unit exceeds the first aperture threshold and the purging process begins, the aperture threshold is changed to a second aperture threshold (e.g., TH) that is smaller than the first aperture threshold. PG2 ).

[0063] According to this embodiment, when the internal combustion engine is unstable immediately after starting, it can reduce the decrease in driving performance and the internal combustion engine misfire. On the other hand, when the internal combustion engine is stable, it can ensure the amount of fuel vapor supplied from the adsorption tank to the internal combustion engine for purging.

[0064] 2. In the above embodiment, when the number of cumulative strokes of the internal combustion engine reaches a predetermined number after the opening degree detected by the opening degree detection unit exceeds the first opening degree threshold and the purging process is started, the opening degree threshold is changed from the first opening degree threshold to the second opening degree threshold.

[0065] According to this embodiment, when the internal combustion engine is operating more stably, the threshold value of the throttle opening can be changed from a first opening threshold value to a second opening threshold value.

[0066] 3. In the above embodiments, the cumulative number of strokes is the cumulative value of the number of strokes in which the purging process is performed in the internal combustion engine.

[0067] According to this embodiment, the cumulative number of strokes used for purging is actually used as an indicator, thus enabling a more accurate understanding (estimation) of the engine's operating state and / or the state of the adsorption tank, thereby improving control over the purging process. In other words, the change from a first opening threshold to a second opening threshold is performed when the purging process has reached a certain stage, thus reducing the decrease in driving performance and internal combustion engine misfires caused by the change to the second opening threshold. Furthermore, by simply measuring the elapsed time and temperature changes such as water temperature, this embodiment also prevents adverse conditions from occurring, as purging is not required in areas where adverse conditions will not occur. Moreover, the state of the adsorption tank can also be understood as the amount of evaporated fuel stored in the adsorption tank 11 (charge amount).

[0068] 4. In the above embodiment, if the cumulative operating time of the internal combustion engine reaches a predetermined time after the opening degree detected by the opening degree detection unit exceeds the first opening degree threshold and the purging process is started, the opening degree threshold is changed from the first opening degree threshold to the second opening degree threshold.

[0069] According to this embodiment, when the internal combustion engine is operating more stably, the threshold value of the throttle opening can be changed from a first opening threshold value to a second opening threshold value.

[0070] 5. In the above embodiments, the cumulative operating time is the cumulative value of the operating time during which the purging treatment is performed in the internal combustion engine.

[0071] According to this embodiment, the cumulative value of the operating time for purging treatment is actually used as an indicator, thus enabling a more accurate understanding (estimation) of the engine's operating state and / or the state of the adsorption tank, improving control over the purging treatment. In other words, the change from a first opening threshold to a second opening threshold is performed when the purging treatment has progressed to a certain extent, thereby reducing the decrease in driving performance and internal combustion engine misfires caused by the change to the second opening threshold. Furthermore, by simply measuring the elapsed time and temperature changes such as water temperature, this embodiment also prevents adverse conditions from occurring, as purging treatment is not required in areas where adverse conditions will not occur. Moreover, the state of the adsorption tank can also be understood as the amount of evaporated fuel stored in the adsorption tank 11 (charge amount).

[0072] 6. In the above embodiment, when the internal combustion engine stops while the opening threshold is set to the second opening threshold, the opening threshold is changed from the second opening threshold to the first opening threshold when the internal combustion engine restarts.

[0073] According to this implementation method, it is possible to reduce the decrease in driving performance and the misfire of the internal combustion engine when it is restarted.

[0074] 7. In the above embodiment, if the time from when the internal combustion engine stops to when the internal combustion engine restarts is less than a predetermined time when the opening threshold is set to the second opening threshold, the opening threshold when the internal combustion engine restarts is maintained at the second opening threshold.

[0075] According to this embodiment, when the stopping time of the internal combustion engine is short, the operating state of the internal combustion engine remains stable even immediately after restarting. Therefore, even if the second opening threshold is maintained when the internal combustion engine is restarted, the reduction in driving performance and misfire of the internal combustion engine can be reduced. In addition, the use of the second opening threshold can ensure the amount of purging.

[0076] 8. In the above embodiment, a speed detection unit (e.g., 22) is further included, which detects the speed of the internal combustion engine.

[0077] When the opening degree detected by the opening degree detection unit exceeds the opening degree threshold and the rotational speed detected by the rotational speed detection unit exceeds the rotational speed threshold (e.g., NE), PG In the event of a certain condition, the control unit performs the purging process.

[0078] According to this embodiment, purging can be performed when the internal combustion engine is in a more stable operating state, thus reducing the decrease in driving performance and internal combustion engine misfire.

[0079] 9. In the above embodiment, when the internal combustion engine is started, the speed threshold is set to a first speed threshold. After the speed detected by the speed detection unit exceeds the first speed threshold and the purging process begins, the speed threshold is changed to a second speed threshold that is smaller than the first speed threshold.

[0080] According to this embodiment, when the internal combustion engine is unstable immediately after starting, it can reduce the decrease in driving performance and the internal combustion engine misfire. On the other hand, when the internal combustion engine is stable, it can ensure the amount of fuel vapor supplied from the adsorption tank to the internal combustion engine for purging.

[0081] 10. In the above embodiment, a temperature detection unit (e.g., 23) is provided, which detects the temperature of the cooling water or oil flowing in the internal combustion engine.

[0082] After the internal combustion engine is started, if the opening degree detected by the opening degree detection unit exceeds the opening degree threshold and the temperature detected by the temperature detection unit exceeds the temperature threshold (e.g., TW), PG In the event of a certain condition, the control unit performs the purging process.

[0083] According to this embodiment, purging can be performed when the internal combustion engine is in a more stable operating state, thus reducing the decrease in driving performance and internal combustion engine misfire.

[0084] 11. In the above embodiment, the device further comprises: a connecting passage (e.g., 14) connecting the adsorption tank to the internal combustion engine; and a purge control valve (e.g., 15) for opening and closing the connecting passage.

[0085] The control unit controls the purge control valve, thereby controlling the purge process.

[0086] According to this embodiment, purging treatment can be performed appropriately.

[0087] This 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 this invention.

Claims

1. A treatment apparatus for treating fuel vapor generated in a vehicle's fuel tank, the treatment apparatus characterized by comprising: Adsorption tank, which stores the fuel vapor; An opening detection unit detects the opening of a throttle valve, which is used to adjust the intake air volume to the internal combustion engine of the vehicle. as well as If the opening degree detected by the opening degree detection unit exceeds the opening degree threshold, the control unit performs a purging process, in which the fuel vapor in the adsorption tank is supplied to the internal combustion engine. When the internal combustion engine starts, the opening threshold is set to a first opening threshold. After the opening degree detected by the opening degree detection unit exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold that is smaller than the first opening threshold. The second opening threshold is set so that the purging process is not performed when the opening detected by the opening detection unit is 0 degrees.

2. The processing apparatus according to claim 1, characterized in that, If the number of cumulative strokes of the internal combustion engine reaches a predetermined number of strokes after the opening degree detected by the opening degree detection unit exceeds the first opening degree threshold and the purging process is started, the opening degree threshold is changed from the first opening degree threshold to the second opening degree threshold.

3. The processing apparatus according to claim 2, characterized in that, The cumulative number of strokes is the cumulative value of the number of strokes in which the purging process is performed in the internal combustion engine.

4. The processing apparatus according to claim 1, characterized in that, If the cumulative operating time of the internal combustion engine reaches a predetermined time after the opening degree detected by the opening degree detection unit exceeds the first opening degree threshold and the purging process is started, the opening degree threshold is changed from the first opening degree threshold to the second opening degree threshold.

5. The processing apparatus according to claim 4, characterized in that, The cumulative operating time is the cumulative value of the operating time during which the purging process is performed in the internal combustion engine.

6. The processing apparatus according to claim 1, characterized in that, When the internal combustion engine stops while the opening threshold is set to the second opening threshold, the opening threshold is changed from the second opening threshold to the first opening threshold when the internal combustion engine restarts.

7. The processing apparatus according to claim 1, characterized in that, If the time from when the internal combustion engine stops to when it restarts is less than a predetermined time when the opening threshold is set to the second opening threshold, the opening threshold at the time of restarting the internal combustion engine is maintained at the second opening threshold.

8. The processing apparatus according to claim 1, characterized in that, It also includes a speed detection unit, which detects the speed of the internal combustion engine. If the opening degree detected by the opening degree detection unit exceeds the opening degree threshold and the rotational speed detected by the rotational speed detection unit exceeds the rotational speed threshold, the control unit performs the purging process.

9. The processing apparatus according to claim 8, characterized in that, When the internal combustion engine is started, the speed threshold is set to a first speed threshold. After the speed detected by the speed detection unit exceeds the first speed threshold and the purging process begins, the speed threshold is changed to a second speed threshold that is smaller than the first speed threshold.

10. The processing apparatus according to claim 1, characterized in that, It is equipped with a temperature detection unit that detects the temperature of the cooling water or oil flowing in the internal combustion engine. After the internal combustion engine is started, if the opening degree detected by the opening degree detection unit exceeds the opening degree threshold and the temperature detected by the temperature detection unit exceeds the temperature threshold, the control unit performs the purging process.

11. The processing apparatus according to claim 1, characterized in that, It also includes: a connecting passage that connects the adsorption tank to the internal combustion engine; and a purge control valve that opens and closes the connecting passage. The control unit controls the purge control valve, thereby controlling the purge process.

12. A treatment apparatus for treating fuel vapor generated in a vehicle's fuel tank, the treatment apparatus characterized by comprising: Adsorption tank, which stores the fuel vapor; An opening detection unit detects the opening of a throttle valve, which is used to adjust the intake air volume to the internal combustion engine of the vehicle. as well as If the opening degree detected by the opening degree detection unit exceeds the opening degree threshold, the control unit performs a purging process, in which the fuel vapor in the adsorption tank is supplied to the internal combustion engine. When the internal combustion engine starts, the opening threshold is set to a first opening threshold. After the opening degree detected by the opening degree detection unit exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold that is smaller than the first opening threshold. The processing device also includes a speed detection unit, which detects the speed of the internal combustion engine. If the opening degree detected by the opening degree detection unit exceeds the opening degree threshold and the rotational speed detected by the rotational speed detection unit exceeds the rotational speed threshold, the control unit performs the purging process. When the internal combustion engine is started, the speed threshold is set to a first speed threshold. After the speed detected by the speed detection unit exceeds the first speed threshold and the purging process begins, the speed threshold is changed to a second speed threshold that is smaller than the first speed threshold.

13. A vehicle, wherein the vehicle comprises: Fuel tanks, which store fuel; and The processing apparatus according to any one of claims 1 to 12.

14. A method for treating fuel vapor generated in a vehicle's fuel tank, the method characterized by comprising: The step of storing the fuel vapor in an adsorption tank; as well as The purging process involves supplying fuel vapor from the adsorption tank to the internal combustion engine when the throttle valve opening exceeds a threshold value. The throttle valve is used to adjust the intake air volume to the vehicle's internal combustion engine. When the internal combustion engine starts, the opening threshold is set to a first opening threshold. After the throttle valve opening exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold that is smaller than the first opening threshold. The second opening threshold is set so that the purging process is not performed when the opening is 0 degrees.

15. A method for treating fuel vapor generated in a vehicle's fuel tank, the method characterized by comprising: The step of storing the fuel vapor in an adsorption tank; as well as The purging process involves supplying fuel vapor from the adsorption tank to the internal combustion engine when the throttle valve opening exceeds a threshold value. The throttle valve is used to adjust the intake air volume to the vehicle's internal combustion engine. When the internal combustion engine starts, the opening threshold is set to a first opening threshold. After the throttle valve opening exceeds the first opening threshold and the purging process begins, the opening threshold is changed to a second opening threshold that is smaller than the first opening threshold. The purging process is performed when the throttle valve opening exceeds the opening threshold and the internal combustion engine speed exceeds the speed threshold. When the internal combustion engine is started, the speed threshold is set to a first speed threshold. After the speed of the internal combustion engine exceeds the first speed threshold and the purging process begins, the speed threshold is changed to a second speed threshold that is smaller than the first speed threshold.

16. A storage medium storing a program for causing a computer to perform the processing method according to claim 14 or 15.

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