Vehicle equipped with a water-cooled high-pressure fuel pump

Abstract

To provide a vehicle that can restrain excessive temperature rise of a high-pressure fuel pump even at the time of coasting travel and at the time of stoppage of an engine.SOLUTION: A vehicle according to one embodiment of the present disclosure comprises: an engine; a high-pressure fuel pump arranged in an engine room together with the engine; a water-cooled intercooler cooling circuit constituted so as to include an electric water pump arranged in the engine room, a water-cooled intercooler through which a refrigerant from the electric water pump flows, and a subsidiary radiator through which the refrigerant from the water-cooled intercooler flows; and a pump water cooling circuit for cooling the high-pressure fuel pump. The pump water cooling circuit branches from the water-cooled intercooler cooling circuit, passes through the high-pressure fuel pump, and is connected to the subsidiary radiator.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present disclosure relates to, for example, a high-pressure fuel pump having a cooling mechanism for a liquid refrigerant and a vehicle equipped with the high-pressure fuel pump. 【Background Art】 【0002】 In vehicles equipped with a diesel engine, a high-pressure fuel pump is mounted to boost the fuel supplied to the engine to a predetermined pressure. In recent years, a high-pressure fuel pump has been combined with some gasoline engines, and the high-pressure fuel pump is used to boost the fuel to a desired pressure and supply it to a fuel injection valve. 【0003】 Since such a high-pressure fuel pump generates heat during operation, a cooling mechanism for cooling the high-pressure fuel pump is required. For example, in the high-pressure fuel pumps exemplified in Patent Document 1 and Patent Document 2, a structure has been proposed in which a water-cooled cooling circuit is provided for the high-pressure fuel pump disposed near the vehicle engine to cool the pump. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 11-062770 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2003-515695 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 However, the aforementioned patent document describes a structure that cools the high-pressure fuel pump using the engine cooling system's coolant or the air conditioner's cooling medium, and there is still considerable room for improvement in cooling performance. For example, when the vehicle is coasting or the engine is stopped, the cooling method described in the above patent document may cause refrigerant circulation to the high-pressure fuel pump to be stagnant, potentially leading to vaporization due to an excessive temperature rise in the high-pressure fuel pump. With the increasing power output of engines in recent years, it is expected that cooling measures for high-pressure fuel pumps in such high-power engines will become even more desirable in the future. 【0006】 This disclosure was made in view of the above-mentioned problems as an example, and aims to provide a vehicle that can suppress excessive temperature rise of the high-pressure fuel pump even during coasting or when the engine is stopped. [Means for solving the problem] 【0007】 To solve the above problems, a vehicle in one embodiment of the present disclosure includes an engine, a high-pressure fuel pump located in the engine compartment together with the engine, an electric water pump located in the engine compartment, a water-cooled intercooler through which the refrigerant from the electric water pump flows, a sub-radiator through which the refrigerant from the water-cooled intercooler flows, a water-cooled intercooler cooling circuit comprising, a pump water-cooling circuit for cooling the high-pressure fuel pump, and the pump for The water cooling circuit is The refrigerant delivered by the electric water pump The fuel passes through the high-pressure fuel pump to the sub-radiator. It's structured in a flowing manner. ru. [Effects of the Invention] 【0008】 According to this disclosure, for example, excessive temperature rise of the high-pressure fuel pump can be suppressed even when the vehicle is coasting or when the engine is stopped. [Brief explanation of the drawing] 【0009】 [Figure 1]This is a schematic diagram showing the high-pressure fuel pump cooling mechanism installed in a vehicle. [Figure 2] This is a schematic top view diagram of a high-pressure fuel pump cooling mechanism in which the water cooling circuit for the pump is installed on the pump body side. [Figure 3] This is a schematic side view diagram of a high-pressure fuel pump cooling mechanism in which the water cooling circuit for the pump is installed on the pump body side. [Figure 4] This is a schematic top view diagram of a high-pressure fuel pump cooling mechanism in which the water cooling circuit for the pump is installed on the pump case side. [Figure 5] This is a schematic side view diagram of a high-pressure fuel pump cooling mechanism in which the water cooling circuit for the pump is installed on the pump case side. [Figure 6] This is a schematic diagram showing a series cooling circuit in which the intercooler and high-pressure fuel pump are connected in series. [Figure 7] This table shows the cooling configuration of the intercooler and high-pressure fuel pump according to the engine operating conditions in a series cooling circuit. [Figure 8] This is a schematic diagram showing a parallel cooling circuit in which the intercooler and high-pressure fuel pump are connected in parallel. [Figure 9] This table shows the cooling configuration of the intercooler and high-pressure fuel pump according to the engine operating conditions in a parallel cooling circuit. [Figure 10] This is a schematic diagram showing a switchable cooling circuit in which the intercooler and high-pressure fuel pump are connected in a way that allows them to be switched between series and parallel connections. [Figure 11] This table shows the cooling modes of the intercooler and high-pressure fuel pump according to the engine operating conditions in a switchable cooling circuit. [Modes for carrying out the invention] 【0010】 Next, a preferred embodiment for implementing the present disclosure will be described. Note that illustrations related to elements and structures not directly related to the present disclosure may be omitted as appropriate. Therefore, for engines and vehicle structures other than the configurations described in detail below, known structures such as the structure of a horizontally opposed engine described in, for example, Japanese Patent Application Laid-Open No. 2020-29833, and the configuration of a water-cooled intercooler also mounted on other engines may be appropriately supplemented and implemented. 【0011】 [Vehicle 100] Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. FIGS. 1 and 6 show a vehicle 100 which is an embodiment of the present disclosure. As understood from FIGS. 1 and 6, the vehicle 100 of the present embodiment includes an engine 10, a high-pressure fuel pump 20, a cooling circuit 30 for a water-cooled intercooler, and a water-cooled circuit 40 for a pump. That is, as shown in FIG. 6, the fuel supplied from the fuel tank 11 is supplied to the high-pressure fuel pump 20 via the supply pipe SP, pressurized to a desired pressure, and then supplied to the engine 10. 【0012】 As an example of the vehicle 100, a four-wheel automobile equipped with the engine 10 is suitable, but the vehicle 100 of the present disclosure is not limited to the above form. That is, the vehicle 100 may be a hybrid vehicle in which the engine 10 and a known secondary battery are mounted together, or a two-wheel automobile. Also, the drive system of the vehicle 100 may be front-wheel drive, rear-wheel drive, or all-wheel drive. 【0013】 The engine 10 is a known internal combustion engine mounted on the vehicle 100 and generates power required for driving the vehicle 100. Examples of such an engine 10 include, for example, a known gasoline engine and a diesel engine. 【0014】 In the case of a four-wheel vehicle, the high-pressure fuel pump 20 is arranged in the engine room together with the above-described engine 10. The specific structure of such a high-pressure fuel pump is not particularly limited as long as it can boost the fuel to a predetermined injection pressure and supply it to a fuel injection valve (not shown) of the engine 10, and a known fuel compression mechanism may be applied. 【0015】 As shown in FIGS. 6, 8, 10, etc., the cooling circuit 30 for the water-cooled intercooler is composed of an electric water pump 31 arranged in the above-described engine room, a water-cooled intercooler 32 through which the refrigerant from this electric water pump 31 flows, and a sub radiator 33 through which the refrigerant from this water-cooled intercooler 32 flows. 【0016】 As the refrigerant used in the cooling circuit 30 for the water-cooled intercooler of the present embodiment, various known cooling waters applicable to the intercooler of the vehicle can be applied. Also, for each of the above-described electric water pump 31, water-cooled intercooler 32, and sub radiator 33, known members used in a known water-cooled intercooler mechanism mounted on the vehicle can be applied. 【0017】 The water-cooling circuit 40 for the pump is configured to have a function of cooling the above-described high-pressure fuel pump 20. More specifically, the water-cooling circuit 40 for the pump of the present embodiment branches from the above-described cooling circuit 30 for the water-cooled intercooler, passes through the high-pressure fuel pump 20, and is connected to the sub radiator 33. In other words, the water-cooling circuit 40 for the pump of the present embodiment uses the refrigerant (cooling water) used in the cooling circuit 30 for the water-cooled intercooler to cool the high-pressure fuel pump 20. As will be described later, the water-cooling circuit 40 for the pump may be integrated with the cooling circuit 30 for the water-cooled intercooler mounted on the vehicle in any form of a series cooling circuit, a parallel cooling circuit, or a switching cooling circuit. 【0018】 Furthermore, as shown in Figure 1, it is preferable that the water cooling circuit 40 for the pump in this embodiment is arranged at least along the periphery of the sub-chamber 23 inside the high-pressure fuel pump 20. Here, the high-pressure fuel pump 20 in this embodiment is composed of a pump body 21 that pressurizes fuel to a predetermined injection pressure and supplies it to the fuel injection valve, and a pump case 22 for attaching and fixing the pump body 21 to the engine 10. 【0019】 More specifically, for example, if the pump water cooling circuit 40 is provided in the pump body 21, it can be exemplified in a configuration where it is located inside the flange of the pump body 21 and along the periphery of the aforementioned sub-chamber 23, as illustrated in Figures 2 and 3. Alternatively, if the pump water cooling circuit 40 is provided in the pump case 22, it can be exemplified in a configuration where it is located inside the pump case 22 and along the periphery of the aforementioned sub-chamber 23, as illustrated in Figures 4 and 5. 【0020】 Furthermore, the "sub-chamber" in the high-pressure fuel pump 20 is a space within the pump where a plunger for pressurizing the fuel is located. Furthermore, "arranged along the perimeter of the sub-chamber 23" refers to a configuration in which the flow path is arranged to match the outer shape of the sub-chamber 23, with a distance sufficient to allow the heat generated in the sub-chamber 23 of the high-pressure fuel pump 20 to be transferred to the refrigerant. 【0021】 In this sub-chamber, the plunger moves up and down for fuel circulation, causing a decrease in pressure and generating heat, which can lead to the generation of fuel vapor (bubbles or air bubbles) within the sub-chamber. Therefore, by arranging the flow path of the water cooling circuit 40 for the pump in this embodiment to be at least along the perimeter of the sub-chamber 23 of the high-pressure fuel pump 20, it is possible to maintain an appropriate temperature within the sub-chamber, thereby suppressing the generation of fuel vapor. 【0022】 Furthermore, since the water cooling circuit 40 for the pump in this embodiment shares the same refrigerant as the water cooling circuit 30 for the water-cooled intercooler, which is different from the engine's cooling water system, it is possible to drive the electric water pump 31 to cool the high-pressure fuel pump 20 even during coasting or when the engine is stopped. This makes it possible to suppress the generation of fuel vapor in the sub-chamber 23 of the high-pressure fuel pump 20, for example, when the vehicle 100 is coasting or when the engine is stopped. 【0023】 Next, a specific example of the circuit configuration in the pump water cooling circuit 40 of this embodiment will be described. The pump water cooling circuit 40 of this embodiment is configured to include refrigerant flow paths 50 (first flow path 51 to seventh flow path 57) which are selected for each circuit and cool the water-cooled intercooler 32 and the high-pressure fuel pump 20. 【0024】 <Specific Example 1 of Water Cooling Circuit 40 for Pumps (Series Cooling Circuit)> First, referring to Figures 6 and 7, we will describe the series-type pump water cooling circuit 40A, which constitutes the series-type cooling circuit for the water-cooled intercooler and the high-pressure fuel pump. 【0025】 As shown in Figure 6, the series-type pump water cooling circuit 40A in this embodiment includes a first flow path 51 connecting the electric water pump 31 and the high-pressure fuel pump 20, a second flow path 52 connecting the high-pressure fuel pump 20 and the water-cooled intercooler 32, and a third flow path 53 connecting the water-cooled intercooler 32 and the sub-radiator 33. Furthermore, the series-type pump water cooling circuit 40A includes a seventh flow path 57 connecting the sub-radiator 33 and the electric water pump 31. 【0026】 In this series-type pump water cooling circuit 40A, the water-cooled intercooler 32 and the high-pressure fuel pump 20 are connected (linked) between the electric water pump 31 and the sub-radiator 33 so that the water-cooled intercooler 32 and the high-pressure fuel pump 20 are in series. In this example, the high-pressure fuel pump 20 is positioned upstream of the water-cooled intercooler 32, but the high-pressure fuel pump 20 may also be positioned downstream of the water-cooled intercooler 32. 【0027】 As a result, the refrigerant (cooling water) delivered by the electric water pump 31 is first supplied to the high-pressure fuel pump 20 (for example, around the sub-chamber 23 described above) via the first passage 51. Next, the refrigerant (cooling water) delivered from the high-pressure fuel pump 20 is supplied to the water-cooled intercooler 32 via the second passage 52. 【0028】 Subsequently, the refrigerant (cooling water) delivered from the water-cooled intercooler 32 is supplied to the sub-radiator 33 via the third passage 53. After heat exchange with the outside air in the sub-radiator 33, the refrigerant (cooling water) is returned to the electric water pump 31 via the seventh passage 57. 【0029】 Compressed air, cooled by passing through a water-cooled intercooler 32, is supplied to the engine 10 via the intake pipe 71. This compressed air is supplied to the water-cooled intercooler 32 via the intake pipe 74 after being compressed by the turbocharger turbine 12, which then flows through the intake pipe 75 via the air cleaner 13. The air exhausted from the engine 10 via the exhaust pipe 72 is used to drive the compressor of the turbine 12 and is also released outside the vehicle via the muffler 14 and exhaust pipe 73. 【0030】 Therefore, according to the series-type pump water cooling circuit 40A of this embodiment, as shown in Figure 7, when the high-pressure fuel pump 20 is operating and the load on the engine 10 is low, or when the supercharger (not shown) is operating and the water-cooled intercooler 32 receives heat to cool the air that has become hot due to adiabatic compression, it is possible to supply refrigerant (cooling water) to cool at least one of the water-cooled intercooler 32 and the high-pressure fuel pump 20 when they generate heat. 【0031】 Furthermore, in the series-type pump water cooling circuit 40A, the water-cooled intercooler 32 and the high-pressure fuel pump 20 are connected in series, which makes it possible to improve the cooling effect while keeping the flow path configuration simple and reducing the cost of materials. 【0032】 Furthermore, as is clear from Figure 7, even when the engine 10 is under no load (such as during coasting, when the engine is stopped, or when idling if there is an idle stop function), the series-type pump water cooling circuit 40A can supply refrigerant (cooling water) to cool at least one of the water-cooled intercooler 32 and the high-pressure fuel pump 20 simultaneously when one of them is generating heat. 【0033】 <Specific Example 40 of Water Cooling Circuit for Pumps, Part 2 (Parallel Cooling Circuit)> Next, with reference to Figures 8 and 9, we will describe the parallel pump water cooling circuit 40B that constitutes the parallel cooling circuit for the water-cooled intercooler and the high-pressure fuel pump. 【0034】 As shown in Figure 8, the parallel pump water cooling circuit 40B in this embodiment includes a first flow path 51 connecting the electric water pump 31 and the high-pressure fuel pump 20, a third flow path 53 connecting the water-cooled intercooler 32 and the sub-radiator 33, a fourth flow path 54 connecting the electric water pump 31 and the water-cooled intercooler 32, and a fifth flow path 55 connecting the high-pressure fuel pump 20 and the sub-radiator 33. 【0035】 Furthermore, the parallel pump water cooling circuit 40B includes a first flow control valve V1 provided in the third flow path 53 and capable of adjusting the flow rate of the refrigerant flowing through the third flow path 53, a second flow control valve V2 provided in the fifth flow path 55 and capable of adjusting the flow rate of the refrigerant flowing through the fifth flow path 55, and a control device 60 that controls the opening degree of the first flow control valve V1 and the second flow control valve V2, respectively. 【0036】 The control device 60 may be configured as an in-vehicle ECU (Electronic Control Unit), and may be configured to include, for example, one or more processors such as a CPU (Central Processing Unit) and one or more memories such as RAM (Random Access Memory) or ROM (Read Only Memory) that are connected to the processors in a manner that allows communication. 【0037】 Thus, the control device 60 functions as a device that controls the opening degrees of the first flow control valve V1 and the second flow control valve V2, respectively, by having one or more processors execute a computer program. The computer program is a computer program that causes the processor to execute the operations that the control device 60 should perform. The computer program executed by the processor may be recorded on a recording medium that functions as a memory unit (not shown) provided in the control device 60, or it may be recorded on a recording medium built into the control device 60 or on a known recording medium that can be attached externally to the control device 60. In addition to controlling the opening degrees of the first flow control valve V1 and the second flow control valve V2, the control device 60 may also perform, for example, electronic control or operation control of the high-pressure fuel pump 20. 【0038】 The recording medium for storing computer programs may include hard disks, floppy disks, magnetic tapes and other magnetic media; optical recording media such as CD-ROMs (Compact Disk Read Only Memory), DVDs (Digital Versatile Disks), and Blu-ray®; magneto-optical media such as floppy disks; memory elements such as RAM and ROM; flash memory such as USB (Universal Serial Bus) memory; SSDs (Solid State Drives); and other media capable of storing programs. 【0039】 In this parallel-type pump water cooling circuit 40B, the water-cooled intercooler 32 and the high-pressure fuel pump 20 are arranged in parallel, with the flow paths of the water-cooled intercooler 32 and the high-pressure fuel pump 20 being independent between the electric water pump 31 and the sub-radiator 33. 【0040】 As a result, the refrigerant (cooling water) delivered by the electric water pump 31 is supplied to the high-pressure fuel pump 20 (for example, around the sub-chamber 23 described above) via the first passage 51, which serves as one of the flow paths. Furthermore, in parallel with this first passage 51, the refrigerant (cooling water) delivered by the electric water pump 31 is supplied to the water-cooled intercooler 32 via the fourth passage 54, which serves as the other flow path. 【0041】 Next, with respect to one of the flow paths, the refrigerant (cooling water) sent from the high-pressure fuel pump 20 is supplied to the sub-radiator 33 via the fifth flow path 55. With respect to the other flow path, the refrigerant (cooling water) sent from the high-pressure fuel pump 20 is supplied to the sub-radiator 33 via the third flow path 53. 【0042】 In this manner, the refrigerant (cooling water) delivered from the high-pressure fuel pump 20 is supplied independently to the high-pressure fuel pump 20 and the water-cooled intercooler 32, respectively, before converging in the sub-radiator 33. After undergoing heat exchange with the outside air in the sub-radiator 33, the refrigerant (cooling water) is returned to the electric water pump 31 via the seventh passage 57. 【0043】 At this time, the control device 60 can control the opening degree of the first flow control valve V1 and the second flow control valve V2, respectively, so it is possible to close the valves when cooling is not necessary. In other words, by controlling the first flow control valve V1 and the second flow control valve V2, the control device 60 can (α) close the first flow control valve V1 and allow the refrigerant (cooling water) sent out by the electric water pump 31 to flow only to the high-pressure fuel pump 20, (β) close the second flow control valve V2 and allow the refrigerant to flow only to the water-cooled intercooler 32, or (γ) open the first flow control valve V1 and the second flow control valve V2 and allow the refrigerant to flow in parallel to the high-pressure fuel pump 20 and the water-cooled intercooler 32. 【0044】 Therefore, according to the parallel pump water cooling circuit 40B of this embodiment, as shown in Figure 9, it is possible to supply refrigerant (cooling water) at any time as needed to whichever of the water-cooled intercooler 32 or high-pressure fuel pump 20 requires cooling, such as when the high-pressure fuel pump 20 is operating and the load on the engine 10 is low, or when the supercharger (not shown) is operating and the water-cooled intercooler 32 generates heat. 【0045】 Furthermore, as is clear from Figure 9, even when the engine 10 is unloaded (such as during coasting, when the engine is stopped, or when idling if there is an idle stop function), the parallel pump water cooling circuit 40B can efficiently supply refrigerant (cooling water) to the side that requires cooling via the valves described above when at least one of the water-cooled intercooler 32 and the high-pressure fuel pump 20 is generating heat. 【0046】 <Specific Example 3 of Pump Water Cooling Circuit 40 (Switchable Cooling Circuit)> Next, with reference to Figures 10 and 11, the water-cooling circuit 40C for the switchable pump, which constitutes the cooling circuit for the water-cooled intercooler and the high-pressure fuel pump, will be described. 【0047】 As shown in Figure 9, the water cooling circuit 40C for the switchable pump in this embodiment includes a first passage 51 connecting the electric water pump 31 and the high-pressure fuel pump 20, a third passage 53 connecting the water-cooled intercooler 32 and the sub-radiator 33, a fifth passage 55 connecting the high-pressure fuel pump 20 and the sub-radiator 33, and a sixth passage 56 branching off from the fifth passage 55 and connected to the water-cooled intercooler 32. 【0048】 Furthermore, the water cooling circuit 40C for the switchable pump includes a second flow control valve V2 provided in the fifth flow path 55 and capable of adjusting the flow rate of the refrigerant flowing through the fifth flow path 55, and a control device 60 that controls the opening degree of the second flow control valve V2. 【0049】 In this water-cooling circuit 40C for a switchable pump, the fifth passage 55 through which the refrigerant supplied from the high-pressure fuel pump 20 flows is connected to the third passage 53 through which the refrigerant supplied from the water-cooled intercooler 32 flows. Furthermore, in the water-cooling circuit 40C for a switchable pump, the sixth passage 56, which branches off from the fifth passage 55 upstream of the second flow control valve V2 (towards the high-pressure fuel pump 20), is connected to the water-cooled intercooler 32. 【0050】 As a result, the refrigerant (cooling water) delivered by the electric water pump 31 is first supplied to the high-pressure fuel pump 20 (for example, around the sub-chamber 23 described above) via the first passage 51. Then, if the second flow control valve V2 is closed, the refrigerant (cooling water) delivered from the high-pressure fuel pump 20 is supplied to the water-cooled intercooler 32 via the fifth passage 55 and the sixth passage 56. Next, the refrigerant (cooling water) delivered from the water-cooled intercooler 32 is supplied to the sub-radiator 33 via the third passage 53. 【0051】 On the other hand, when the second flow control valve V2 is open, the refrigerant (cooling water) sent from the high-pressure fuel pump 20 is supplied to the sub-radiator 33 via the fifth flow path 55, which has less resistance, although some of the refrigerant is also supplied to the sixth flow path 56 that leads to the water-cooled intercooler 32. 【0052】 In this manner, the refrigerant (cooling water) delivered from the high-pressure fuel pump 20 is configured to either flow directly into the sub-radiator 33 or flow into the sub-radiator 33 via the water-cooled intercooler 32. After heat exchange with the outside air in the sub-radiator 33, the refrigerant (cooling water) is returned to the electric water pump 31 via the seventh passage 57. 【0053】 Thus, in the water-cooling circuit 40C for the switchable pump, the control device 60 can perform two types of cooling processes by controlling the second flow rate adjustment valve V2 described above: standalone cooling in which the necessary refrigerant flows to the high-pressure fuel pump 20 but virtually no refrigerant flows to the water-cooled intercooler 32, and simultaneous cooling in which refrigerant flows to both the high-pressure fuel pump 20 and the water-cooled intercooler 32. In other words, the control device 60 controls the high-pressure fuel pump 20 to be cooled either independently or by switching the water-cooled intercooler 32 and the high-pressure fuel pump 20 to be cooled in series via the second flow rate adjustment valve V2. 【0054】 Therefore, according to the switchable pump water cooling circuit 40C of this embodiment, as shown in Figure 11, it is possible to supply refrigerant (cooling water) to the water-cooled intercooler 32 as needed, while covering all the timings in which cooling of the high-pressure fuel pump 20 is necessary, such as when the high-pressure fuel pump 20 is operating and the load on the engine 10 is low, or when the supercharger (not shown) is operating and the water-cooled intercooler 32 generates heat. 【0055】 Furthermore, as is clear from Figure 11, even when the engine 10 is unloaded (such as during coasting, when the engine is stopped, or when idling if there is an idle stop function), the water cooling circuit 40C for the switchable pump can efficiently supply refrigerant (cooling water) to the side that requires cooling via the valve described above when at least one of the water-cooled intercooler 32 and the high-pressure fuel pump 20 is generating heat. 【0056】 As described above, a vehicle 100 equipped with any of the pump water cooling circuits 40 (40A to 40C) of this embodiment can suppress excessive temperature rise of the high-pressure fuel pump even during coasting or when the engine is stopped. Furthermore, a vehicle 100 equipped with any of the pump water cooling circuits 40 (40A to 40C) of this embodiment can improve cooling efficiency by making it possible to relatively lower the temperature of the refrigerant supplied to the high-pressure fuel pump, regardless of the engine speed, compared to conventional configurations using air cooling or engine coolant. 【0057】 While preferred embodiments of the present disclosure have been described in detail above with reference to the attached drawings, the present disclosure is not limited to such examples. It is obvious to any person with ordinary skill in the art to which the present disclosure pertains to attempt further modifications to these embodiments and variations within the scope of the technical idea set forth in the claims, and these modifications will naturally also fall within the technical scope of the present disclosure. [Explanation of Symbols] 【0058】 100 vehicles 10 Engines 20 High-pressure fuel pump 30 Cooling circuit for water-cooled intercooler 40 Water cooling circuit for pump 50 Refrigerant flow path 60 Control device

Claims

[Claim 1] The engine and A high-pressure fuel pump, which is located in the engine compartment together with the engine, A cooling circuit for a water-cooled intercooler comprising an electric water pump located in the engine compartment, a water-cooled intercooler through which refrigerant from the electric water pump flows, and a sub-radiator through which refrigerant from the water-cooled intercooler flows, The pump water cooling circuit for cooling the high-pressure fuel pump is included, The pump water cooling circuit is configured such that the refrigerant delivered by the electric water pump flows through the high-pressure fuel pump to the sub-radiator. vehicle. [Claim 2] The water cooling circuit for the pump is arranged at least along the periphery of the sub-chamber inside the high-pressure fuel pump. The vehicle according to claim 1. [Claim 3] A first flow path connecting the electric water pump and the high-pressure fuel pump, A second passage connecting the high-pressure fuel pump and the water-cooled intercooler, It includes a third passage connecting the water-cooled intercooler and the sub-radiator, The water-cooled intercooler and the high-pressure fuel pump are connected in series between the electric water pump and the sub-radiator. The vehicle according to claim 2. [Claim 4] A first flow path connecting the electric water pump and the high-pressure fuel pump, A third passage connecting the water-cooled intercooler and the sub-radiator, A fourth passage connecting the electric water pump and the water-cooled intercooler, A fifth passage connecting the high-pressure fuel pump and the sub-radiator, A first flow control valve is provided in the third flow path, A second flow control valve is provided in the fifth flow path, The system includes a control device that controls the opening degree of the first flow control valve and the second flow control valve, respectively. The water-cooled intercooler and the high-pressure fuel pump are connected between the electric water pump and the sub-radiator so that they are in parallel. The vehicle according to claim 2. [Claim 5] A first flow path connecting the electric water pump and the high-pressure fuel pump, A third passage connecting the water-cooled intercooler and the sub-radiator, A fifth passage connecting the high-pressure fuel pump and the sub-radiator, A sixth flow path branches off from the fifth flow path and connects to the water-cooled intercooler, A second flow control valve is provided on the downstream side of the branch in the fifth flow path, Includes a control device for controlling the opening degree of the second flow control valve, The control device controls the high-pressure fuel pump to be cooled either independently or in series with the water-cooled intercooler via the second flow rate adjustment valve. The vehicle according to claim 2.

Images