JP2014083918A - Intake air temperature regulating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake air temperature regulating system capable of appropriately regulating a temperature of intake air of an internal combustion engine even when a cooling system of an intercooler and a cooling system of an inverter are integrated with each other.SOLUTION: A cooling system of an intercooler 21 and a cooling system of an inverter 6 are integrated with each other. After passing through the intercooler 21, cooling water is made to flow through both of a cooler 61 and a sub radiator 73 in parallel. A flow rate ratio between inflow amount of the cooling water flowing in to the cooler 61 and inflow amount of the cooling water flowing in to the sub radiator 73 can be regulated by a flow regulating valve 72. Due to this configuration, even when the cooling system of the intercooler 21 and the cooling system of the inverter 6 are integrated with each other, a temperature of intake air of an engine 1 can be appropriately regulated. As a result, deterioration of fuel economy caused by excessive cooling of intake air in the intercooler 21 and generation of condensed water in the intercooler 21 can be effectively suppressed.

Description

  The present invention is applied to a hybrid vehicle that travels using at least one of an internal combustion engine with a supercharger and a travel motor as a power source for vehicle travel, and adjusts the temperature of intake air flowing through the intake passage of the internal combustion engine. The present invention relates to an intake air temperature adjustment system.

  2. Description of the Related Art Conventionally, some vehicles equipped with an internal combustion engine with a supercharger include an intercooler for cooling intake air that has been pressurized by the supercharger to become high temperature and pressure. In this type of vehicle, a water-cooled intercooler is employed to improve response performance by reducing the volume of the intake system (see, for example, Patent Document 1). In general, the intercooler is composed of a cooling system independent of the cooling water circuit of the internal combustion engine in order to increase the cooling efficiency of the intake air.

Japanese Unexamined Patent Publication No. 57-5514

  By the way, the inventors of the present invention have a configuration in which intake air is cooled by a water-cooled intercooler, and at least one of an internal combustion engine having a supercharger and a travel motor whose supply power is adjusted by an inverter travels in a vehicle. Application to a hybrid vehicle that travels as a power source.

  In a hybrid vehicle, an inverter that controls the traveling motor generates heat when traveling with the traveling motor. Therefore, a cooling system that cools the inverter is required, and there is a concern that the cooling system of the vehicle may be complicated.

  On the other hand, the present inventors connect the cooling system of the inverter to the cooling system that cools the intake air by the intercooler, and integrates each cooling system in parallel with the intercooler, thereby cooling the vehicle. We are planning to simplify the system.

  However, if the cooling system of the intercooler and the cooling system of the inverter are simply connected in parallel, there is a problem that it is difficult to adjust the temperature of the intake air in the intercooler.

  For example, if an intercooler cooling system and an inverter cooling system are simply connected in parallel, a cooling fluid may flow through the intercooler during cooling of the inverter, and intake air may be excessively cooled. In this case, moisture contained in the intake air may be condensed on the surface of the intercooler, and the condensed moisture may enter the combustion chamber of the internal combustion engine, causing liquid compression, corrosion of each member, and the like.

  Also, in an internal combustion engine with a supercharger, the fuel consumption tends to be optimal when the intake air reaches about 80 ° C. in a low load region, and if the intake air is excessively cooled by the intercooler, the fuel consumption is reduced. It will get worse.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide an intake air temperature adjustment system capable of appropriately adjusting the temperature of intake air of an internal combustion engine even when an intercooler cooling system and an inverter cooling system are integrated. .

  The present invention travels using at least one of an internal combustion engine (1) with a supercharger (4) and a travel motor (5) whose power supply is adjusted by an inverter (6) as a power source for vehicle travel. And an intake air temperature adjustment system that adjusts the temperature of intake air flowing through the intake passage (2) of the internal combustion engine.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a cooling fluid circulation circuit (7) provided independently of the cooling water circulation circuit (10) for cooling the internal combustion engine and circulating the cooling fluid; An electric pump (71) that is provided in the cooling fluid circulation circuit and circulates the cooling fluid, an intercooler (21) that exchanges heat between the intake air pressurized by the supercharger and the cooling fluid, and a cooling fluid flow of the intercooler An inverter cooler (61) connected to the downstream side to exchange heat between the cooling fluid after passing through the intercooler and the inverter to cool the inverter, and in parallel to the inverter cooler on the downstream side of the cooling fluid flow of the intercooler A sub-radiator (73) connected to cool the cooling fluid after passing through the intercooler, and an inflow amount of cooling fluid flowing into the inverter cooler and a flow to the sub-radiator It is characterized by comprising a flow rate adjusting means for adjusting the flow rate of the inflow of cooling fluid (72, 74), the.

  According to this, by increasing the inflow amount of the cooling fluid to the sub radiator by the flow rate adjusting means, the cooling fluid cooled by the sub radiator can be circulated to the intercooler and the intake air can be cooled.

  Also, by increasing the amount of cooling fluid flowing into the inverter cooler by the flow rate adjusting means, the cooling fluid heated by the inverter cooler can be circulated to the intercooler to raise the temperature of the intake air. . At this time, the inverter is cooled by the cooling fluid flowing through the inverter cooler.

  Therefore, even if the cooling system of the intercooler and the cooling system of the inverter are integrated, the temperature of the intake air of the internal combustion engine can be adjusted appropriately. As a result, fuel consumption deterioration due to excessive cooling of intake air in the intercooler and generation of condensed water in the intercooler can be effectively suppressed.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

1 is an overall configuration diagram of an intake air temperature adjustment system according to a first embodiment. It is a schematic diagram which shows the flow of the cooling fluid in the low water temperature circuit at the time of warming of intake air. It is a schematic diagram which shows the flow of the cooling fluid in the low water temperature circuit at the time of cooling of intake air. It is a whole block diagram of the intake air temperature adjustment system which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
First, the first embodiment will be described. In the present embodiment, the intake air temperature adjustment system of the present invention is applied to a hybrid vehicle that can travel using at least one of the water-cooled engine (internal combustion engine) 1 and the traveling motor 5 as a power source for traveling the vehicle.

  As shown in the overall configuration diagram of FIG. 1, an inverter 6 is connected to the traveling motor 5. The inverter 6 is a power converter that adjusts the power supplied from a battery (not shown) to the traveling motor 5 to change the rotational speed of the traveling motor 5.

  Since the inverter 6 generates heat when power is supplied to the traveling motor 5, a cooler 61 that cools the inverter 6 is integrated. The cooler 61 constitutes an inverter cooler 61 that cools the inverter 6 by exchanging heat between the inverter 6 and cooling water (cooling fluid) that flows through a low water temperature circuit 7 described later. The inverter 6 is provided with an inverter temperature sensor that detects the temperature of the inverter 6.

  The engine 1 is connected to an engine coolant circuit (circulation circuit) 10 through which engine coolant flows, and is configured to radiate the heat of the engine 1 to the engine coolant.

  The engine cooling water circuit 10 includes an engine cooling pump 11 for circulating the engine cooling water, and a radiator for radiating the engine cooling water heated by the engine 1 to blown air (outside air) from a cooling fan (not shown). 12 is provided.

  Further, the engine 1 is connected to an intake passage 2 that guides intake air sucked from the outside of the vehicle into the cylinder, and an exhaust passage 3 that discharges exhaust gas from the inside of the cylinder (combustion chamber) to the outside of the vehicle.

  In the intake passage 2, in order from the upstream side of the air flow, a supercharger 4 that pressurizes intake air, an intake flow rate sensor (not shown) that detects the flow rate of intake air, and a high-temperature and high-pressure pressurized by the supercharger 4. An intercooler 21 for cooling the air, an intake air temperature sensor (not shown) for detecting the temperature of the intake air, and the like are provided. The intake air flow rate sensor and the intake air temperature sensor provided in the intake passage 2 are connected to the control device 100 described later, and the detection values of the sensors can be acquired by the control device 100 described later.

  The supercharger 4 recovers energy from the exhaust gas of the engine 1 and converts it into power, and pressurizes the intake air flowing through the intake passage 2 of the engine 1 with the recovered power. In this embodiment, as the supercharger 4, a turbine 42 provided in the exhaust passage 3 and driven by the energy of the exhaust gas, and a compression provided in the intake passage 2 of the engine 1 and driven by the rotational torque of the turbine 42. A turbocharger having a machine 41 is employed.

  The intercooler (I / C) 21 is disposed in the intake passage 2, and high-temperature and high-pressure air pressurized by the compressor 41 of the supercharger 4 and cooling water (cooling fluid) flowing through a low water temperature circuit 7 described later. ) To cool the air.

  On the other hand, in the exhaust passage 3, a turbine 42 of the supercharger 4, a filter (not shown), and the like are provided in order from the upstream side of the gas flow. The filter includes a collection unit that collects particulate matter, a three-way catalyst that purifies NOx, and the like, and collects particulate matter contained in the exhaust gas and purifies NOx and the like.

  Next, the low water temperature circuit 7 will be described. The low water temperature circuit 7 of the present embodiment is configured independently of the engine cooling water circuit 10 through which high-temperature engine cooling water flows, and cooling water (cooling fluid) having a temperature lower than the temperature of the engine cooling water circulates. It is a cooling fluid circulation circuit.

  The low water temperature circuit 7 is provided with a low water temperature pump 71 for circulating the cooling water. The low water temperature pump 71 is an electric pump that is configured to be capable of changing the cooling water discharge flow rate (cooling water circulation flow rate) and is controlled by the control device 100 described later.

  The cooling water inlet side of the intercooler 21 is connected to the cooling water discharge side of the low water temperature pump 71. In the intercooler 21, the cooling water discharged from the low water temperature pump 71 and the intake air flowing through the intake passage 2 exchange heat.

  On the cooling water outlet side of the intercooler 21, a branching portion 7 a that bifurcates the cooling water path downstream of the intercooler 21 is provided. In one of the cooling water paths branched by the branching portion 7a, the sub-radiator 73 that cools the cooling water by exchanging heat between the cooling water that has passed through the intercooler 21 and blown air (outside air) from a cooling fan (not shown). Is provided. Further, in the other cooling water path branched by the branch portion 7a, the inverter 6 is provided with a cooler 61 by exchanging heat between the cooling water after passing through the intercooler 21 and the inverter 6.

  A flow rate adjusting valve 72 is provided in the branch portion 7a of the present embodiment. The flow rate adjusting valve 72 functions as a flow rate adjusting unit that adjusts the flow rate ratio between the inflow amount of the cooling water flowing into the cooler 61 and the inflow amount of the cooling water flowing into the sub radiator 73.

  The flow rate adjusting valve 72 of the present embodiment changes the flow rate ratio between the inflow amount of cooling water flowing into the cooler 61 and the inflow amount of cooling water flowing into the sub-radiator 73 by a control signal from the control device 100 described later. It consists of possible electric three-way regulating valve.

  On the cooling water outlet side of the cooler 61 and the cooling water outlet side of the sub radiator 73, a merging portion 7b for joining the cooling water paths branched by the branching portion 7a is provided. The inlet side of the low water temperature pump 71 is connected to the cooling water outlet side of the merging portion 7b, and the cooling water flowing out from the cooler 61 and the refrigerant flowing out from the sub-radiator 73 merge at the merging portion 7b. After that, it is sucked into the low water temperature pump 71.

  Next, the outline of the electronic control unit in the present embodiment will be described. The control device 100 includes a well-known microcomputer comprising a CPU, a memory (ROM, EEPROM, RAM, etc.) constituting a storage means, and its peripheral circuits. It is configured. The control device 100 is a control unit that performs various operations and processes based on a control program stored in a memory, and controls operations of various control target devices connected to the output side.

  Specifically, on the input side of the control device 100, a start switch for operating start / stop of a vehicle (not shown), a battery sensor for detecting the remaining battery charge, an engine speed sensor for detecting the engine speed, a vehicle speed A sensor group for driving the vehicle such as a vehicle speed sensor for detecting the engine and a sensor group for the low water temperature circuit 7 such as an intake air temperature sensor, an intake air flow rate sensor, and an inverter temperature sensor are connected.

  Further, on the output side of the control device 100, there are a fuel injection valve drive circuit (not shown) for supplying fuel to the engine 1, an inverter 6, an engine cooling pump 11, a low water temperature pump 71, a flow rate adjusting valve 72, and the like. It is connected.

  In the present embodiment, the configuration for controlling the low water temperature pump 71 in the control device 100 constitutes the pump control means 100a, and the configuration for controlling the flow rate adjusting valve 72 in the control device 100 constitutes the flow rate control means 100b. Yes.

  Next, the operation of this embodiment according to the above configuration will be described. When the start switch is turned on and the vehicle is started, the control device 100 acquires detection signals of various vehicle traveling sensor groups at a predetermined control cycle, and the engine 1 and the traveling motor 5 that form a power source from the acquired detection signals. A vehicle driving load indicating a load state (such as a remaining amount of electricity stored in a battery) is detected.

  Then, control device 100 selects a power source for vehicle travel from engine 1 and travel motor 5 according to the travel load of the vehicle, and causes the vehicle to travel using the selected power source. At this time, the control device 100 controls the operation of the cooling fan and the engine cooling pump 11 so that the temperature of the engine 1 is maintained at a desired temperature.

  Next, the operation of the low water temperature circuit 7 in the intake air temperature adjustment system will be described. When the start switch is turned on and the vehicle is started, the control device 100 acquires detection signals of various flow rate control sensor groups at a predetermined control cycle, and the low water temperature is changed according to the acquired detection signals and the traveling load of the vehicle. The operation of the pump 71 and the flow rate adjustment valve 72 is controlled.

  Specifically, control device 100 determines whether there is a request for warming up of intake air and a request for cooling in intercooler 21 according to the load of engine 1, the temperature of intake air, and the like.

  For example, in a situation where the load on the engine 1 side is relatively small (partial region), it is determined that there is a warm-up request when the temperature of the intake air falls below an appropriate temperature range (for example, around 70 ° C. to 90 ° C.). On the other hand, when the load on the engine 1 side is relatively large, it is determined that there is a cooling request when the temperature of the intake air exceeds the appropriate temperature range (for example, 40 ° C. to 60 ° C.).

  When there is a warm-up request, the control device 100 controls the flow rate adjustment valve 72 so that the amount of cooling water flowing into the cooler 61 is larger than the amount of cooling water flowing into the sub-radiator 73.

  Further, when the temperature of the intake air greatly deviates from the appropriate temperature, the control device 100 of the present embodiment controls the flow rate adjustment valve 72 so that the entire amount of the cooling water after passing through the intercooler 21 flows into the cooler 61. . That is, the control device 100 controls the flow rate adjustment valve 72 so that the cooling water path provided with the cooler 61 is opened and the cooling water path provided with the sub radiator 73 is closed.

  Further, the control device 100 sets the low water temperature pump so that the circulating amount of the cooling water in the low water temperature circuit 7 becomes a predetermined minimum required flow rate so that the cooling water after passing through the cooler 61 has a higher temperature. 71 is controlled. For example, when the cooling capacity (heat loss) in the inverter 6 is 300 W and the circulating flow rate of the cooling water is 1 L / min, the temperature of the cooling water is increased by about 5 ° C. in the cooler 61.

  As a result, the cooling water discharged from the low water temperature pump 71 flows in the order of the intercooler 21 → the flow rate adjusting valve 72 → the cooler 61 → the suction side of the low water temperature pump 71 as shown in FIG. Circulate through 7.

  At this time, the cooling water heated to a higher temperature by the cooler 61 flows into the intercooler 21, and the high-temperature cooling water and the intake air that have flowed in exchange heat in the intercooler 21, and the intake air rises. Warm up. Note that the inverter 6 is cooled by the cooling water flowing through the cooler 61.

  On the other hand, when there is a cooling request, the control device 100 controls the flow rate adjustment valve 72 so that the cooling water after passing through the intercooler 21 flows into both the cooler 61 and the sub-radiator 73.

  In the control device 100 of the present embodiment, the amount of cooling water flowing into the sub radiator 73 is larger than the amount of cooling water flowing into the cooler 61 in order to ensure the heat radiation performance of the cooling water in the sub radiator 73. The flow rate adjustment valve 72 is controlled so that

  Further, the control device 100 controls the low water temperature pump 71 so that the circulation amount of the cooling water in the low water temperature circuit 7 is larger than when there is a request for warming up (so as to be larger than the necessary minimum flow rate). To do.

  Thereby, as shown in FIG. 3, the cooling water after passing through the intercooler 21 flows to the suction side of the flow rate adjusting valve 72 → the cooler 61 → the low water temperature pump 71, and at the same time, the flow rate adjusting valve 72 → the sub radiator 73 → It flows to the suction side of the low water temperature pump 71 and circulates in the low water temperature circuit 7.

  At this time, the cooling water cooled by the sub-radiator 73 flows into the intercooler 21, and the low-temperature cooling water and the intake air that have flowed in exchange heat with the intercooler 21, and the intake air cools down.

  Here, when there is a cooling request, the intake air is at a much higher temperature than the inverter 6 at the maximum output point of the engine 1, so that the entire amount of cooling water after passing through the intercooler 21 flows into the sub-radiator 73. It is desirable to control the flow rate adjustment valve 72. In this case, since the low water temperature circuit 7 becomes an independent circuit of the intercooler 21 and the sub radiator 73, the cooling performance in the intercooler 21 can be sufficiently secured.

  When neither a warming request nor a cooling request is present, the flow rate adjustment valve 72 and the low water temperature pump 71 are controlled according to the temperature of the inverter 6. At this time, the flow rate adjusting valve 72 may be controlled so that the cooling water after passing through the intercooler 21 flows into both the cooler 61 and the sub-radiator 73. Note that when there is neither a warm-up request nor a cooling request for the intake air and the temperature of the inverter 6 is low, the control device 100 stops the low water temperature pump 71.

  In the present embodiment described above, the cooling system of the intercooler 21 and the cooling system of the inverter 6 are integrated, and the cooling water after passing through the intercooler 21 is configured to flow in parallel to both the cooler 61 and the sub radiator 73. The flow rate adjusting valve 72 can adjust the flow rate ratio between the inflow amount of the cooling water flowing into the cooler 61 and the inflow amount of the cooling water flowing into the sub-radiator 73.

  According to this, by increasing the inflow amount of the cooling fluid to the sub-radiator 73 by the flow rate adjusting valve 72, the cooling fluid cooled by the sub-radiator 73 is circulated to the intercooler 21 to lower the intake air temperature. Can do.

  Conversely, by increasing the flow rate of the cooling fluid into the cooler 61 by the flow rate adjusting valve 72, the cooling fluid heated by the cooler 61 is circulated to the intercooler 21 to raise the temperature of the intake air. it can. At this time, the inverter 6 is cooled by the cooling fluid flowing through the cooler 61.

  Therefore, even if the cooling system of the intercooler 21 and the cooling system of the inverter 6 are integrated, the temperature of the intake air of the engine 1 can be appropriately adjusted. As a result, fuel consumption deterioration due to excessive cooling of the intake air in the intercooler 21 and generation of condensed water in the intercooler 21 can be effectively suppressed.

  Further, in the present embodiment, the low water temperature pump 71 is provided on the downstream side of the sub radiator 73 and the cooler 61 (downstream side of the merging portion 7 b) and on the upstream side of the intercooler 21.

  According to this, a relatively low-temperature cooling fluid after passing through the sub-radiator 73 and the cooler 61 flows into the low water temperature pump 71. Therefore, the low water temperature pump 71 can be made of a material having a low heat resistance temperature. It becomes possible, and the improvement of the freedom degree of design can be aimed at.

  Further, in the present embodiment, when the control device 100 is warming up to raise the intake air, the circulation flow rate of the cooling water in the low water temperature circuit 7 is smaller than the circulation flow rate at the time of cooling to cool the intake air. The electric pump 61 is controlled.

  In this way, the cooling fluid that has been heated to a higher temperature by the cooler 61 is circulated to the intercooler 21 by reducing the circulating flow rate of the cooling water in the low water temperature circuit 7 during the warming up of the intake air. Therefore, the temperature of the intake air can be raised more appropriately.

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  In the present embodiment, the flow rate adjusting valve 74 constituting the flow rate adjusting means is provided on the downstream side of the sub-radiator 73 and the cooler 61 and upstream of the intercooler 21 (upstream side of the low water temperature pump 71). Yes. More specifically, as shown in the overall configuration diagram of FIG. 4, the flow rate adjustment valve 74 is arranged in the junction 7 b of the low water temperature circuit 7.

  Other configurations and operations are the same as those in the first embodiment. Therefore, according to the configuration of the present embodiment, similarly to the first embodiment, even if the cooling system of the intercooler 21 and the cooling system of the inverter 6 are integrated, the temperature of the intake air of the engine 1 can be adjusted appropriately. Can do.

  In addition to this, in the present embodiment, the flow rate adjustment valve 74 is provided in the junction 7b. For this reason, since the relatively low-temperature cooling water after passing through the sub-radiator 73 and the cooler 61 flows into the flow rate adjusting valve 74, the flow rate adjusting valve 74 can be made of a material having a low heat resistance temperature. The degree of freedom can be improved.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In the above-described embodiments, the example in which the flow rate adjustment valves 72 and 74 are configured by three-way adjustment valves has been described, but the present invention is not limited to this. For example, an electromagnetic valve that opens and closes each cooling water path branched by the branching portion 7 a is provided, and the electromagnetic valve is controlled to flow in the cooling water flowing into the cooler 61 and into the sub-radiator 73. You may make it adjust the flow rate ratio with the inflow amount of the cooling water to perform. In this case, each solenoid valve constitutes a flow rate adjusting means. From the viewpoint of heat resistance, it is desirable to provide each solenoid valve on the downstream side of the cooler 61 and the sub radiator 73.

  (2) As in the above-described embodiments, it is desirable to provide the low water temperature pump 71 between the merging portion 7b and the intercooler 21 from the viewpoint of heat resistance. 71 may be provided between the branching portion 7 a and the intercooler 21.

  (3) In each of the above-described embodiments, the example in which the presence / absence of the intake air warming request and the cooling request is determined according to the load of the engine 1 and the temperature of the intake air has been described. However, the present invention is not limited to this. Based on factors other than the load of the engine 1 and the temperature of the intake air, whether or not there is a request for warming and cooling of the intake air may be determined.

  (4) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say.

1 engine (internal combustion engine)
10 Engine coolant circuit (circulation circuit)
2 Intake passage 21 Intercooler 4 Supercharger 5 Traveling motor 6 Inverter 61 Cooler (Inverter cooler)
7 Low water temperature circuit (cooling fluid circulation circuit)
73 Sub-radiator 72, 74 Flow rate adjustment valve (flow rate adjustment means)

Claims (5)

A hybrid vehicle that travels using at least one of an internal combustion engine (1) with a supercharger (4) and a travel motor (5) whose power supply is adjusted by an inverter (6) as a power source for vehicle travel. An intake air temperature adjustment system, which is applied and adjusts the temperature of intake air flowing through the intake passage (2) of the internal combustion engine,
A cooling fluid circulation circuit (7) provided independently of the circulation circuit (10) for cooling the internal combustion engine and circulating the cooling fluid;
An electric pump (71) provided in the cooling fluid circulation circuit for circulating the cooling fluid;
An intercooler (21) for exchanging heat between the intake air pressurized by the supercharger and the cooling fluid;
An inverter cooler (61) connected to the downstream side of the cooling fluid flow of the intercooler, for cooling the inverter by exchanging heat between the cooling fluid after passing through the intercooler and the inverter;
A sub-radiator (73) connected in parallel to the inverter cooler on the downstream side of the cooling fluid flow of the intercooler, and for cooling the cooling fluid after passing through the intercooler;
Flow rate adjusting means (72, 74) for adjusting a flow rate ratio between the inflow amount of the cooling fluid flowing into the inverter cooler and the inflow amount of the cooling fluid flowing into the sub-radiator;
An intake air temperature adjustment system characterized by comprising: Flow rate control means (100b) for controlling the flow rate adjustment means,
The flow rate control means is
Controlling the flow rate adjusting means so that the amount of the cooling fluid flowing into the sub-radiator is larger than the amount of the cooling fluid flowing into the inverter cooler when lowering the temperature of the intake air;
When the temperature of the intake air is raised, the flow rate adjusting means is controlled so that the inflow amount of the cooling fluid flowing into the inverter cooler is larger than the inflow amount of the cooling fluid flowing into the sub-radiator. The intake air temperature adjustment system according to claim 1.   The flow rate adjusting means (72) is provided on the downstream side of the cooling fluid flow of the sub-radiator and the inverter cooler and on the upstream side of the cooling fluid flow of the intercooler. 2. The intake air temperature adjustment system according to 2.   4. The electric pump according to claim 1, wherein the electric pump is provided on the downstream side of the cooling fluid flow of the sub radiator and the inverter cooler and on the upstream side of the cooling fluid flow of the intercooler. The intake air temperature adjustment system according to one. Pump control means (100a) for controlling the electric pump to change the circulation flow rate (mass flow rate) of the cooling fluid circulating in the cooling fluid circulation circuit;
The pump control means controls the electric pump so that the circulation flow rate when the intake air is heated is less than the circulation flow rate when the intake air is cooled. Item 5. The intake air temperature adjustment system according to any one of Items 1 to 4.

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