JP2008157073A - Canister detaching mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a canister detaching mechanism effectively heating a canister early after start of an engine. <P>SOLUTION: Exhaust heat recovery equipment 20 is disposed in the middle of an exhaust pipe 18 through which exhaust from the engine 16 is delivered. Heat transfer liquid 22 in circulating pipes 26, 28 is heated by the exhaust heat recovery equipment 20. Therefore, compared with the constitution heating the liquid by using engine cooling water, activated carbon 32 in the canister 14 can be effectively warmed early after the start of the engine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a canister detachment mechanism.

  In a canister for treating evaporative fuel generated in a fuel tank or the like, efficient desorption is possible by increasing the temperature during desorption (purge) of the evaporative fuel. For this reason, in Patent Document 1, for example, an air heating unit that warms air with exhaust heat is formed near the exhaust pipe of an internal combustion engine, and the canister is heated appropriately by supplying air heated by the air heating unit to the canister. An evaporative fuel processing apparatus is described.

  However, in the configuration in which the warmed air is sent to the canister, the temperature of the air is lowered while the air is being sent, so the effect of warming the canister is reduced.

  Patent Document 2 describes a canister in which a cooling water passage is provided in the canister body and the activated carbon of the canister body is heated by circulating the cooling water of the engine through the cooling water passage.

However, since the temperature of the engine coolant is relatively low immediately after the engine is started, the canister may not be heated sufficiently.
Japanese Utility Model Publication No. 2-105564 Japanese Utility Model Publication No. 1-105564

  In view of the above facts, an object of the present invention is to obtain a canister detaching mechanism capable of efficiently heating a canister from an early stage after the engine is started.

  In the invention according to claim 1, the heat transfer device is provided between an exhaust pipe connected to the engine and heats the heat transfer liquid with the recovered heat, and the heat transfer between the exhaust heat recovery device and the canister. And a distribution pipe for distributing liquid.

  In the present invention, the heat transfer liquid is heated by the heat recovered by the exhaust heat recovery device. Then, the heated heat transfer liquid is sent to the canister through the distribution pipe. For this reason, for example, compared to a configuration in which engine cooling water is sent to the canister without being heated by the exhaust heat recovery device, the heat transfer liquid can be heated earlier (in a short time) after the engine is started. It becomes possible to warm efficiently.

  In addition, since the activated carbon of the canister is warmed using the heat transfer liquid, the temperature of the activated carbon is less likely to be lowered while being sent to the canister as compared with the configuration in which the activated carbon is warmed using the gas, and the activated carbon can be efficiently heated.

  Thus, by efficiently warming the activated carbon of the canister and raising the temperature in this way, it is possible to efficiently desorb the evaporated fuel by the canister.

  According to a second aspect of the present invention, in the first aspect of the present invention, the distribution pipe is configured to allow the heat transfer liquid to flow from the canister to the exhaust heat recovery device through the engine. Features.

  Thereby, since the heat transfer liquid also serves as engine cooling water, the activated carbon of the canister can be efficiently warmed with a simple configuration.

  Further, the heat transfer liquid can be heated not only by the exhaust heat recovery device but also by the heat of the engine.

  According to a third aspect of the present invention, in the second aspect of the present invention, a bypass pipe that partially branches from the flow pipe and bypasses the canister, and a branch portion between the flow pipe and the bypass pipe are provided. A first switching valve that switches the flow of the heat transfer liquid, and a control device that switches and controls the first switching valve in response to the canister desorption request.

  Therefore, when there is a canister detachment request, the controller transfers the heat transfer liquid from the flow pipe to the canister, and when there is no detachment request, the control device is configured so that the heat transfer liquid bypasses the canister by the bypass pipe. One switching valve can be switched. In this way, by bypassing the canister when there is no desorption request, the temperature of the heat transfer liquid can be reduced to the desired temperature in a short time compared to the configuration in which the heat transfer liquid is sent to the canister even when there is no desorption request. It is possible to raise it.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the heat transferred from the heat transfer liquid flowing through the flow pipe to the engine cooling fluid for cooling the engine. An exchange device.

  Therefore, the engine coolant can be further heated by the heat exchange device using the heat transfer liquid heated by the exhaust heat recovery device.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a heat exchange pipe partially branched from the flow pipe and bypassing the canister and passing through the heat exchange device, and the flow pipe And a second switching valve provided at a branch portion between the heat exchange pipe and the heat exchange pipe, and a control device that switches and controls the second switching valve in response to a desorption request. And

  Therefore, when there is a canister desorption request, the heat transfer liquid is sent from the distribution pipe to the canister via the heat exchange pipe, and when there is no desorption request, the heat transfer liquid bypasses the canister by the bypass pipe. As such, the control device can switch the second switching valve. In this way, by bypassing the canister when there is no desorption request, the temperature of the heat transfer liquid can be reduced to the desired temperature in a short time compared to the configuration in which the heat transfer liquid is sent to the canister even when there is no desorption request. It becomes possible to raise it.

  The invention according to claim 6 is the heat transfer amount according to any one of claims 1 to 5, wherein the exhaust heat recovery device adjusts the heat transfer amount to the heat transfer liquid. Adjusting means.

  The temperature of the heat transfer liquid can be controlled to approach a desired temperature by adjusting the amount of heat transfer to the heat transfer liquid by the heat transfer amount adjusting means.

  The adjustment of the amount of heat transfer by the adjusting means can be performed by adjusting the amount of heat transfer liquid to which heat is actually transmitted in the exhaust heat recovery device, for example.

  Since the present invention has the above configuration, the canister can be efficiently heated from the early stage after the engine is started.

  FIG. 1 shows a canister detachment mechanism 12 according to the first embodiment of the present invention. The canister detaching mechanism 12 has a canister 14 for processing evaporated fuel generated in a fuel tank (not shown) of an automobile. Activated carbon 32 is accommodated in the canister 14, and evaporated fuel sent from a fuel tank or the like is adsorbed by the activated carbon 32. Further, fresh air is introduced into the canister 14 from the outside, and the adsorbed evaporated fuel is desorbed from the activated carbon 32 using this fresh air.

  In the canister detaching mechanism 12, an exhaust heat recovery device 20 is provided in the middle of an exhaust pipe 18 through which exhaust from the engine 16 is sent. Between the exhaust heat recovery device 20 and the canister 14, circulation pipes 26 and 28 in which a heat transfer liquid 22 made of, for example, pure water is accommodated are disposed. A part of the heat from the exhaust is recovered by the exhaust heat recovery device 20 and the heat transfer liquid 22 is heated.

  Further, the canister 14 is formed with a liquid passage 30 that allows the heat transfer liquid 22 sent from the distribution pipe 26 to pass therethrough and sends the heat transfer liquid 22 to the distribution pipe 28 after the passage. Therefore, the circulation path 24 of the loop-shaped (closed curve shape) heat transfer liquid 22 returning from the exhaust heat recovery device 20 to the exhaust heat recovery device 20 through the distribution pipe 26, the canister 14, and the distribution pipe 28 is provided. . In the canister 14, heat is transferred from the heat transfer liquid 22 to the activated carbon 32 in the canister 14 in the liquid passage 30.

  In the canister detachment mechanism 12 of the first embodiment having such a configuration, the heat transfer liquid 22 in the circulation path 24 is warmed by the exhaust heat recovery device 20. Then, the heated heat transfer liquid 22 passes through the liquid passage 30 of the canister 14 so that the activated carbon 32 in the canister 14 is also warmed.

  Here, FIG. 2 shows the relationship between the amount of fresh air sent to the canister 14 at the time of desorption (purge air amount) and the actual desorption amount when the activated carbon 32 is heated (with heating) and when it is not heated. (No heating). Regardless of heating, the amount of desorption increases as the amount of purge air increases. Regardless of the amount of purge air, the amount of desorption is higher when activated carbon 32 is heated than when it is not heated. Is getting bigger.

  In the present embodiment, as described above, the activated carbon 32 in the canister 14 is heated by the heat transfer liquid 22 heated by the exhaust heat recovery device 20. Therefore, the detachment of the evaporated fuel from the activated carbon 32 can be promoted as compared with the configuration in which the activated carbon 32 is not heated.

  In order to superheat the activated carbon 32 in the canister 14 using the heat of the exhaust heat recovery device 20 in this way, for example, instead of the heat transfer liquid 22 (liquid) of this embodiment, air or the like is used. Although using gas is also considered, when using gas, the temperature fall in the middle of being sent to the canister 14 from the exhaust heat recovery device 20 is larger than the heat transfer liquid 22 (liquid) of this embodiment. That is, in the present embodiment, the activated carbon 32 can be efficiently heated by using the heat transfer liquid 22 as a medium for transferring heat, compared to a configuration using gas.

  Further, for the purpose of merely heating the activated carbon 32, for example, a configuration in which general engine cooling water is allowed to pass through the canister 14 is also conceivable. Here, FIG. 3 shows the temperature of each of the engine cooling water (without heating) when not heated by the exhaust heat recovery unit 20 and the heat transfer liquid 22 (with heating) heated by the exhaust heat recovery unit 20. Is qualitatively shown in relation to the elapsed time after engine startup. As can be seen from this graph, the heat transfer liquid 22 and the engine cooling water have the same temperature in the final stage (after warming up), but in the middle of the process (during warming up), The temperature is higher than the engine coolant.

  In the present embodiment, since the activated carbon 32 of the canister 14 is heated using the heat transfer liquid 22 heated by the exhaust heat recovery device 20, the engine cooling water is used in comparison with the configuration in which the engine cooling water is used for heating. The activated carbon 32 can be effectively heated from the early stage after the start.

  FIG. 4 shows a canister detachment mechanism 42 according to the second embodiment of the present invention. In the second embodiment, the same components and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, of the two circulation pipes 26 and 28 constituting the circulation path, the circulation pipe 28 is connected to the engine 16 instead of the exhaust heat recovery device 20. Further, a circulation pipe 44 is newly provided between the engine 16 and the exhaust heat recovery device 20. Thus, the circulation path of the loop-shaped (closed curve) heat transfer liquid 22 that returns from the exhaust heat recovery device 20 to the exhaust heat recovery device 20 from the distribution pipe 26, the canister 14, and the distribution piping 28 through the engine 16 and the distribution piping 44. 24 is provided.

  A branch pipe 46 is provided in the middle of the distribution pipe 28, and a radiator 48 is disposed on the branch pipe 46. A flow path switching valve 52 is provided at a branch portion of the distribution pipe 26 and the branch pipe 46, and a temperature sensor that detects the temperature of the heat transfer liquid 22 in the distribution pipe 26 on the upstream side (side closer to the canister 14). 50 is provided. The control circuit 54 controls the flow path switching valve 52 based on the temperature measured by the temperature sensor 50.

  In the middle of the distribution pipe 44, a heat absorption part 56 of a heater that warms the passenger compartment of the automobile is arranged (the whole picture of the heater is not shown). The interior of the passenger compartment is utilized using the heat of the heat transfer liquid 22 in the distribution pipe 44. Can be heated.

  The canister detachment mechanism 42 of the second embodiment having such a configuration also has the same effect as the canister detachment mechanism 12 of the first embodiment. However, in the second embodiment, heat transfer is also performed by the engine 16. The liquid 22 can be heated. For this reason, it becomes possible to heat the activated carbon 32 in the canister 14 more efficiently than the first embodiment.

  In the second embodiment, when the temperature of the heat transfer liquid 22 detected by the temperature sensor 50 exceeds a predetermined value set in advance, the control circuit 54 connects the flow path switching valve 52 to the branch pipe 46. Switch to the side. Thereby, the heat transfer liquid 22 is cooled through the radiator 48. At this time, part of the heat of the heat transfer liquid 22 is absorbed by the canister 14 on the upstream side of the radiator 48. For this reason, the cooling load of the radiator 48 can be reduced as compared with a configuration in which the heat transfer liquid 22 does not pass through the canister 14.

  FIG. 5 shows a canister detachment mechanism 62 according to the third embodiment of the present invention. In the third embodiment, the same components and members as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the third embodiment, in addition to the configuration of the second embodiment, a bypass pipe 64 that bypasses the canister 14 is provided between the distribution pipe 26 and the distribution pipe 28. A flow path switching valve 66 is provided at a branch portion between the distribution pipe 26 and the bypass pipe 64. The flow path switching valve 66 is controlled by the same control circuit 54 as in the second embodiment, but in the third embodiment, the control circuit 54 is controlled by a warm-up state sensor (not shown) during traveling, etc. A signal indicating the warming-up state of the engine 16 (whether it is warming up or after warming up) is sent. Based on this signal, the control circuit 54 causes the heat transfer liquid 22 to pass through the bypass pipe 64 when the engine 16 is warming up, and from the circulation pipe 26 into the canister 14 (liquid passage) when the engine 16 is warming up. 30) The flow path switching valve 66 is switched to pass through.

  In the canister detaching mechanism 62 of the third embodiment having such a configuration, after the engine 16 is warmed up, the control circuit 54 controls the flow path switching valve 66 so that the heat transfer liquid 22 is placed in the canister 14 ( To the liquid passage 30). Thereby, there exists an effect similar to the canister removal | desorption mechanism 42 of 2nd embodiment.

  Furthermore, in the third embodiment, when the engine 16 is warming up, the control circuit 54 controls the flow path switching valve 66 to send the heat transfer liquid 22 to the bypass pipe 64. Since the heat transfer liquid 22 does not pass through the canister 14 and the activated carbon 32 is not deprived of heat, the temperature does not decrease. Therefore, compared with the case where the heat transfer liquid 22 passes through the canister 14, the temperature can be increased in a short time. Thereby, since heat is transmitted to the heat absorption part 56 of the heater at an early stage, the heating performance of the heater can be improved.

  In addition, it is conceivable to apply the present embodiment to a hybrid vehicle, that is, a vehicle having a motor in addition to the engine 16 as a driving drive source of the automobile. A so-called eco mode that lowers the output (or stops the engine) may be set. In the present embodiment, the engine 16 can be warmed up early because the temperature of the heat transfer liquid 22 that also serves as engine cooling water rises in a short time. As a result, since the conditions for switching to the eco mode are satisfied early, fuel efficiency can be improved.

  FIG. 6 shows a canister detachment mechanism 72 according to a fourth embodiment of the present invention. The basic configuration of the canister detachment mechanism 72 according to the fourth embodiment is the same as that of the canister detachment mechanism 62 according to the third embodiment. However, when the channel switching valve 66 is switched, a detachment request from the canister 14 is requested. That is, the determination is made based on a signal indicating whether or not the evaporated fuel needs to be desorbed from the activated carbon 32. This control will be described with reference to the flow shown in FIG. In the initial state, the flow path switching valve 66 is set on the bypass pipe 64 side.

  In this flow, first, in step S112, it is determined whether or not there is a desorption request. If there is a desorption request, it is determined in step S114 whether or not the temperature of the heat transfer liquid 22 is equal to or higher than a predetermined value. This predetermined value is set in advance as a temperature sufficient to heat the activated carbon 32 in the canister 14. If the temperature of the heat transfer liquid 22 has not reached this predetermined value, the process waits until it reaches in step S114. During this time, since the flow path switching valve 66 is maintained on the bypass piping side, the temperature of the heat transfer liquid 22 can be increased in a shorter time than when the heat transfer liquid 22 flows to the canister side.

  When the temperature of the heat transfer liquid 22 reaches a predetermined temperature, the flow path switching valve 66 is switched to the canister 14 side in step S116. The activated carbon 32 in the canister 14 can be efficiently heated by the heat transfer liquid 22 whose temperature has already reached a predetermined value.

  Thereafter, in step S118, it is determined whether the desorption request has been canceled. If not released, the process returns to step S114. If canceled, in step S120, the flow path switching valve 66 is switched to the bypass pipe 64 side, and the process is terminated.

  Thus, in the fourth embodiment, the flow path switching valve 66 can be controlled based on the presence / absence of a desorption request and the temperature of the heat transfer liquid 22. In the fourth embodiment, the temperature sensor 50 can be omitted, and in this case, the flow path switching valve 66 may be controlled based only on the presence or absence of a desorption request.

  Further, the flow control valve 66 is controlled based on the warm-up state of the engine 16 as in the third embodiment, and the flow based on the presence / absence of a desorption request and the temperature of the heat transfer liquid 22 as in the fourth embodiment. The control of the path switching valve 66 may be used in combination.

  FIG. 8 shows a canister detaching mechanism 82 according to a fifth embodiment of the present invention. In the fifth embodiment, the same components and members as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the fifth embodiment, the exhaust heat recovery device 20 includes a recovery switching valve 84 in addition to the configuration of the second embodiment. The recovery switching valve 84 can be switched between a side that actively transfers heat from the exhaust to the heat transfer liquid 22 (heating side) and a side that does not perform such operation (non-recovering side). Yes.

  In the fifth embodiment, a temperature sensor 86 is provided in the distribution pipe 26 from the exhaust heat recovery device 20 to the canister 14. That is, the temperature of the heat transfer liquid 22 after exiting the exhaust heat recovery device 20 can be detected. The detected temperature data is sent to the control circuit 54, and the control circuit 54 controls the recovery switching valve 84 based on this. This control will be described with reference to the flow shown in FIG. In the initial state, the recovery switching valve 84 is set to the recovery side.

  In this flow, first, in step S212, it is determined whether or not the temperature of the heat transfer liquid 22 has reached a predetermined value or more. The predetermined value is a temperature necessary for heating the passenger compartment using the heat transfer liquid 22 and maintaining the warm-up state of the engine 16. Therefore, it is set independently of the predetermined value in step S114 of FIG. 7 which is used as a determination criterion for the purpose of heating the activated carbon 32 in the canister 14. If the temperature of the heat transfer liquid 22 has not reached the predetermined value, the process waits until it reaches in step S212. During this time, since the recovery switching valve 84 is maintained on the recovery side, the temperature of the heat transfer liquid 22 can be increased in a shorter time than when the recovery switching valve 84 is on the non-recovery side.

  When the temperature of the heat transfer liquid 22 reaches a predetermined temperature, the recovery switching valve 84 is switched to the non-recovery side in step S214.

  Next, in step S216, it is determined whether or not there is a desorption request. If there is a desorption request, it is determined in step S218 whether or not the temperature of the heat transfer liquid 22 needs to be further increased. That is, since the set value of the temperature of the heat transfer liquid 22 that has been set as the determination criterion in step S212 is different from the determination criterion set for the purpose of heating the activated carbon 32 in the canister 14, the activated carbon is renewed in this step S218. It is determined whether or not the temperature required for heating 32 is reached. And when it is necessary to raise the temperature of the heat-transfer liquid 22 further, step S218 is repeated.

  When it is not necessary to raise the temperature of the heat transfer liquid 22, the recovery switching valve 84 is switched to the recovery side in step S220. Thereby, the temperature of the heat transfer liquid 22 can be further increased. And the activated carbon 32 in the canister 14 can be efficiently heated by the heat transfer liquid 22 having the increased temperature.

  Thereafter, in step S222, it is determined whether the desorption request has been canceled. If not released, the process returns to step S218. If canceled, the recovery switching valve 84 is switched to the non-recovery side in step S224, and the process is terminated.

  As described above, in the fifth embodiment, the temperature of the heat transfer liquid 22 can be adjusted by switching the recovery switching valve 84 based on the presence / absence of a desorption request and the temperature of the heat transfer liquid 22.

  Note that the recovery switching valve 84 is an example of a means for adjusting the temperature of the heat transfer liquid 22 after passing through the exhaust heat recovery device 20. If the temperature of the heat transfer liquid 22 can be adjusted in this way, the recovery switching valve 84 is concrete. The configuration is not particularly limited.

  FIG. 10 shows a canister detachment mechanism 92 according to a sixth embodiment of the present invention. In the sixth embodiment, the same components and members as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the canister detaching mechanism 92 of the sixth embodiment, in addition to the configuration of the canister detaching mechanism 42 of the second embodiment, a heat exchanger 94 is provided in the distribution pipe 28 extending from the canister 14 to the exhaust heat recovery device 20. Yes. Therefore, considering the circulation path 24 of the heat transfer liquid 22, the canister 14 and the heat exchanger 94 are arranged in series.

  Further, the engine cooling water is circulated in a cooling water pipe 96 provided independently of the circulation path 24. In the heat exchanger 94, heat is transferred from the heat transfer liquid 22 in the circulation pipe 28 to the engine cooling water in the cooling water pipe 96.

  The canister detachment mechanism 92 of the sixth embodiment configured as described above has the same operational effects as the canister detachment mechanism 12 of the first embodiment and the canister detachment mechanism 42 of the second embodiment. Furthermore, in the sixth embodiment, part of the exhaust heat of the engine 16 also moves to the engine cooling water in the cooling water pipe 96 via the heat transfer liquid 22. As a result, the temperature of the engine cooling water can be more effectively maintained, so that heat can be transmitted to the heat absorbing portion 56 of the heater at an early stage, and the heating performance of the heater can be improved.

  Moreover, in the sixth embodiment, the phase change is such that the heat transfer liquid 22 is temporarily vaporized by heating from the exhaust heat recovery device 20 and then is liquefied by the heat exchanger 94 taking heat away from the engine cooling water. It is also possible to generate As a result, the temperature of the engine cooling water is maintained using the latent heat at the time of aggregation of the heat transfer liquid 22, so that the exhaust heat recovery efficiency and utilization efficiency are further increased.

  Further, when the present embodiment is applied to a hybrid vehicle, the engine 16 is brought into a warm-up state early and the conditions for switching to the eco mode are satisfied early, so that fuel efficiency can be improved.

  FIG. 11 shows a canister detaching mechanism 102 according to a seventh embodiment of the present invention. In the seventh embodiment, the same components, members and the like as those in the first embodiment, the second embodiment, or the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The canister detachment mechanism 102 of the seventh embodiment also includes a heat exchanger 94 similar to the canister detachment mechanism 92 of the sixth embodiment. However, in the seventh embodiment, the canister detachment mechanism 102 is provided in the circulation path 24 of the heat transfer liquid 22. When viewed along, the heat exchanger 94 is arranged in parallel with the canister 14. The circulation path 24 is also partially branched correspondingly, and a heat exchange pipe 104 is provided. A flow path switching valve 106 that is controlled to be switched by the control circuit 54 is provided at the branch portion. The conditions (parameters) for controlling the flow path switching valve 106 include, for example, a warm-up state of the engine 16 (during warm-up or after warm-up), a desorption request for the canister 14, the temperature of the heat transfer liquid 22, and the engine One or a plurality of combinations selected from the cooling water temperature or the like can be used. In the present embodiment, in particular, the flow path switching valve 106 can be switched according to at least whether or not the canister 14 is requested to be detached.

  The canister detachment mechanism 92 according to the seventh embodiment having the above configuration has the same operational effects as the canister detachment mechanism 92 according to the sixth embodiment. In addition, in the seventh embodiment, the temperature of the heat transfer liquid 22 and the temperature of the engine cooling water can be controlled so as to approach the desired temperatures according to the various parameters described above.

  In addition, as embodiment of this invention, it is not limited to what was mentioned above, Moreover, it is also possible to combine the component of each embodiment suitably. For example, means for adjusting the temperature of the heat transfer liquid 22 after passing through the exhaust heat recovery device 20, such as the recovery switching valve 84 shown in the fifth embodiment, may be applied to other embodiments. Further, the bypass pipe 64 and the flow path switching valve 66 shown in the third embodiment may be applied to other embodiments.

It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 1st embodiment of this invention. It is a graph which shows qualitatively the general relationship between the purge air amount and desorption amount in a canister by the presence or absence of heating to a canister. It is a graph which shows the time change of the temperature of a heat-transfer liquid qualitatively by the presence or absence of the heating by an exhaust heat recovery device. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 2nd embodiment of this invention. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 3rd embodiment of this invention. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 4th embodiment of this invention. It is a flowchart which shows switching control of the flow-path switching valve in the canister detachment | desorption mechanism of 4th embodiment of this invention. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 5th embodiment of this invention. It is a flowchart which shows switching control of the collection | recovery switching valve in the canister detachment | desorption mechanism of 5th embodiment of this invention. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 6th embodiment of this invention. It is explanatory drawing which shows schematic structure of the canister detachment | desorption mechanism of 7th embodiment of this invention.

Explanation of symbols

12 Canister Desorption Mechanism 14 Canister 16 Engine 18 Exhaust Pipe 20 Waste Heat Recovery Unit 22 Heat Transfer Liquid 24 Circulation Path 26 Distribution Pipe 28 Distribution Pipe 30 Liquid Path 32 Activated Carbon 42 Canister Desorption Mechanism 44 Distribution Pipe 46 Branch Pipe 48 Radiator 50 Temperature Sensor 52 Flow path switching valve 54 Control circuit (control device)
56 heat absorption part 62 canister detaching mechanism 64 bypass piping 66 flow path switching valve (first switching valve)
72 canister detachment mechanism 82 canister detachment mechanism 84 recovery switching valve (heat transfer amount adjusting means)
86 Temperature Sensor 92 Canister Desorption Mechanism 94 Heat Exchanger (Heat Exchanger)
96 Cooling water piping 102 Canister desorption mechanism 104 Heat exchange piping 106 Flow path switching valve (second switching valve)

Claims (6)

An exhaust heat recovery device for heating the heat transfer liquid with the recovered heat provided in the exhaust pipe connected to the engine;
Between the exhaust heat recovery device and the canister, a distribution pipe for circulating the heat transfer liquid,
A canister detachment mechanism characterized by comprising:   2. The canister detachment mechanism according to claim 1, wherein the circulation pipe is configured to allow the heat transfer liquid to flow from the canister to the exhaust heat recovery device through the engine. A bypass pipe partially branched from the flow pipe and bypassing the canister;
A first switching valve provided at a branch portion between the flow pipe and the bypass pipe to switch the flow of the heat transfer liquid;
A control device that switches and controls the switching valve in response to the detachment request of the canister;
The canister detachment mechanism according to claim 2, wherein A heat exchange device for transferring heat from a heat transfer liquid flowing through the flow pipe to an engine cooling fluid for cooling the engine;
The canister detachment mechanism according to any one of claims 1 to 3, wherein the canister detachment mechanism is provided. A heat exchanging pipe partially branched from the flow pipe and bypassing the canister and passing through the heat exchanging device;
A second switching valve provided at a branch portion between the flow pipe and the heat exchange pipe to switch the flow of the heat transfer liquid;
A control device that switches and controls the switching valve in response to a desorption request;
The canister detachment mechanism according to claim 4, wherein The exhaust heat recovery device adjusts the amount of heat transferred to the heat transfer liquid, heat transfer amount adjusting means,
The canister detachment mechanism according to claim 1, wherein the canister detachment mechanism is provided.

Images