JP7238479B2 - Condensate treatment equipment - Google Patents

Description

The present invention relates to a condensed water treatment device, and more particularly to a condensed water treatment device mounted on a vehicle.

2. Description of the Related Art Conventionally, it is known that water contained in intake air of an internal combustion engine is condensed and condensed water is generated in an intake passage. Especially in an internal combustion engine with a low-pressure exhaust gas recirculation system and an intake air cooling system (intercooler), the exhaust gas is circulated to the intake passage. Condensed water is generated by cooling the circulated exhaust gas by the intake air cooling device, and the generated condensed water stays downstream of the intake air cooling device.

A condensed water treatment device for treating condensed water is also known (see, for example, Patent Documents 1 and 2). The condensed water treatment device of Patent Literature 1 includes a bypass passage that communicates between the condensed water storage tank and the exhaust passage. The condensed water treatment device drives the electric supercharger after the internal combustion engine stops to discharge the condensed water in the condensed water storage tank to the exhaust passage through the bypass passage. Thereby, the condensed water is treated in the exhaust passage. Further, in the condensed water treatment device of Patent Document 2, the condensed water adhering to the intake passage is evenly distributed to the internal combustion engine and burned in the internal combustion engine, and the condensed water treatment device treats the condensed water.

JP 2014-74356 A JP 2018-168783 A

However, in the condensed water treatment device of Patent Document 1, since the condensed water is discharged to the exhaust passage, there is a problem that the condensed water adheres to the exhaust passage. In addition, since the condensed water contains exhaust gas components and the like, there is a problem that exhaust purification performance is impaired when these components are contained in the exhaust gas and discharged. On the other hand, when the condensed water is treated by burning it in an internal combustion engine, as in the condensed water treatment device of Patent Document 2, if the operating state of the internal combustion engine is not such that the condensed water can be treated, the exhaust gas purification performance and output of the internal combustion engine It causes performance loss.

SUMMARY OF THE INVENTION An object of the present invention is to provide a condensed water treatment apparatus capable of treating condensed water without impairing exhaust purification performance and output performance of an internal combustion engine.

A condensed water treatment apparatus according to the present invention is an apparatus for treating condensed water of an internal combustion engine mounted on a vehicle. The condensed water treatment device includes a calculator, an indicator, and a controller. The calculator calculates the amount of condensed water generated in the intake passage of the internal combustion engine. The instruction unit instructs to stop the internal combustion engine. When the instructing unit instructs to stop the internal combustion engine, the control unit varies the rotation speed of the internal combustion engine according to the amount of condensed water calculated by the calculating unit, burns the condensed water in the internal combustion engine, and then to stop.

In this condensed water treatment device, the internal combustion engine can be operated and the condensed water can be burned while the output of the internal combustion engine is not requested. If no power is being demanded of the internal combustion engine, the internal combustion engine can be brought into optimum operating conditions to burn the condensate. As a result, the condensed water can be treated without impairing the output performance and exhaust purification performance of the internal combustion engine. Also, the control unit varies the rotation speed of the internal combustion engine according to the amount of condensed water. Thereby, the operating time of the internal combustion engine can be adjusted according to the amount of condensed water.

The controller may increase the rotational speed of the internal combustion engine as the amount of condensed water increases.

The higher the rpm of the internal combustion engine, the greater the ability of the internal combustion engine to handle condensate. According to this configuration, the greater the amount of condensed water, the higher the ability of the internal combustion engine to process the condensed water. As a result, it is possible to prevent the internal combustion engine from increasing the time it takes to process the condensed water.

The condensed water treatment device may further include a temperature detector that detects the temperature of the internal combustion engine. The controller may increase the rotational speed of the internal combustion engine as the temperature of the internal combustion engine increases.

According to this configuration, the higher the temperature of the internal combustion engine, the higher the rotational speed of the internal combustion engine and the larger the amount of condensed water that can be processed by the internal combustion engine per unit time. As a result, the condensed water can be treated in a shorter time.

The instruction unit may issue an automatic stop instruction to automatically stop the internal combustion engine. The control unit may determine whether the stop is an automatic stop. When the stop is an automatic stop, the control unit may change the rotational speed of the internal combustion engine to burn the condensed water in the internal combustion engine.

If the internal combustion engine is automatically stopped, it will also start in temperate conditions when the internal combustion engine is restarted. Therefore, there is a low possibility that the internal combustion engine will fail to start due to the influence of the condensed water burned in the internal combustion engine before the internal combustion engine is stopped. According to this configuration, the control section that receives the automatic stop instruction from the instruction section treats the condensed water while controlling the rotation speed of the internal combustion engine. As a result, the condensed water remaining in the intake passage can be actively treated.

The condensed water treatment device may further include an intake air cooling device for cooling intake air taken into the internal combustion engine. The controller may control the outlet temperature of the cooling device to be within a predetermined temperature range when treating the condensed water.

According to this configuration, it is possible to manage the temperature of the intake air cooling device outlet where condensed water is likely to be generated. As a result, a state in which condensed water can easily evaporate can be maintained. As a result, the condensed water is easily drawn into the internal combustion engine, and the condensed water is easily burned.

The condensed water treatment device according to the present invention can treat condensed water without impairing the output performance and exhaust purification performance of the internal combustion engine.

1 is a system diagram of a condensed water treatment apparatus of the present invention; FIG. The figure at the time of mounting the condensed water treatment apparatus of this invention on a vehicle. 4 is a flow chart of the condensed water treatment apparatus of the present invention; 4 is a flow chart of temperature control of the intake air cooling device of the condensed water treatment device of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the condensed water treatment device 1 includes an internal combustion engine 2, an intake passage 4, an exhaust passage 6, a supercharger 8, a low-pressure exhaust circulation device 10, an intake air cooling device (intercooler (hereinafter referred to as , IC)) 12 , an engine water cooling device 14 , an IC water cooling device 16 , a generator 18 , and a storage battery 20 . The condensed water treatment device 1 also includes a calculation unit 22, an instruction unit 24, a control unit 26, an engine water temperature detection unit (an example of a temperature detection unit) 27, an outside air temperature detection unit 28, and a charging rate detection unit 30. And prepare. In the present embodiment, the calculation unit 22 , the instruction unit 24 and the control unit 26 are functional configurations realized by software recorded in an ECU (Electronic Control Unit) 32 .

The internal combustion engine 2 includes a cylinder head 202, a cylinder block 204 in which a plurality of cylinders N are arranged, a piston 206 sliding inside the cylinders N, a fuel injection device 208, an intake manifold 210, an exhaust manifold 212, and a throttle valve 214 . The internal combustion engine 2 forms a combustion chamber 216 with the piston 206, the cylinder head 202, and the cylinder N. As shown in FIG. Fuel injector 208 also injects fuel directly into combustion chamber 216 . An intake manifold 210 supplies air to each intake port (not shown) of the internal combustion engine 2 . Throttle valve 214 adjusts the amount of intake air supplied to intake manifold 210 . Throttle valve 214 is electrically connected to ECU 32 .

In this embodiment, the internal combustion engine 2 is explained using a direct injection gasoline engine, but it is not limited to this, and a diesel engine may be used. As shown in FIG. 2, the internal combustion engine 2 is housed in an engine room located in front of the vehicle C. As shown in FIG. In this embodiment, the vehicle has an idle stop function that stops the operation of the internal combustion engine 2 when the vehicle C stops or just before it stops. In this embodiment, the direction indicated by arrow F in FIG. 2 is referred to as the vehicle front, and the opposite direction is referred to as the vehicle rear.

The intake passage 4 is connected to an intake manifold 210 via a throttle valve 214 of the internal combustion engine 2 and supplies intake air to a plurality of cylinders N of the internal combustion engine 2, as shown in FIG. The intake passage 4 has an air cleaner 402 . The air cleaner 402 filters dust in the air taken into the internal combustion engine 2 . In this embodiment, the air cleaner 402 side of the intake passage 4 is referred to as upstream of the intake passage, and the internal combustion engine 2 side is referred to as downstream.

An intake air temperature sensor (outside air temperature detector) 28 is provided downstream of the air cleaner 402 and measures the intake air temperature of the vehicle C (outside air temperature). A humidity sensor 29 is provided downstream of the air cleaner 402 to measure the humidity of the intake air. An intake air temperature sensor (outside air temperature detector) 28 and a humidity sensor 29 are electrically connected to the ECU 32 .

The exhaust passage 6 is connected to an exhaust manifold 212 of the internal combustion engine 2 and discharges exhaust gas from the internal combustion engine 2 . In this embodiment, the exhaust manifold 212 side of the exhaust passage 6 is referred to as upstream of the exhaust passage, and the opposite side is referred to as downstream. An exhaust purification catalyst 602 for purifying exhaust gas is provided downstream of the turbine of the supercharger 8, which will be described later. Upstream and downstream of the exhaust purification catalyst 602, air-fuel ratio sensors 604a and 604b for measuring the oxygen concentration in the exhaust gas are provided. Air-fuel ratio sensors 604 a and 604 b are electrically connected to ECU 32 .

The supercharger 8 is a device that supercharges the intake air drawn into the internal combustion engine 2 using the exhaust gas of the internal combustion engine 2 . The supercharger 8 has a turbine (not shown), a compressor arranged coaxially with the turbine, and a wastegate valve for adjusting the amount of exhaust gas flowing into the turbine. The turbine is arranged upstream of the exhaust purification catalyst 602 in the exhaust passage 6 . The compressor is arranged downstream of the air cleaner 402 in the intake passage 4 .

The low-pressure exhaust gas circulation device 10 is a circulation device that circulates the exhaust gas discharged from the internal combustion engine 2 to the intake passage 4 . The low-pressure exhaust circulation device 10 has an exhaust circulation passage 102 , an exhaust circulation valve 104 , an exhaust circulation gas cooling section 106 , a differential pressure sensor 108 , and an exhaust circulation gas temperature sensor 110 . The exhaust circulation passage 102 is connected to the exhaust passage 6 downstream of the turbine and the intake passage 4 upstream of the compressor.

The exhaust circulation valve 104 is arranged on the exhaust circulation passage 102 in the vicinity of the connection with the intake passage 4 and adjusts the amount of the exhaust circulation gas supplied to the intake passage 4 . A differential pressure sensor 108 measures pressure upstream and downstream of the exhaust circulation valve 104 . The exhaust circulation gas temperature sensor 110 is arranged closer to the intake passage 4 than the exhaust circulation gas cooling section 106 of the exhaust circulation passage 102, and measures the temperature of the exhaust circulation gas. Exhaust circulation valve 104 , differential pressure sensor 108 , and exhaust circulation gas temperature sensor 110 are electrically connected to ECU 32 . The exhaust circulation gas cooling unit 106 cools the exhaust circulation gas flowing through the exhaust circulation passage 102 . In this embodiment, the exhaust circulation gas cooling unit 106 is supplied with the cooling water of the engine water cooling device 14 and cools the exhaust circulation gas by heat exchange.

The intake air cooling device 12 is a device that cools the intake air supercharged by the supercharger 8 . In this embodiment, the intake air cooling device 12 is a water-cooled intercooler, and a passage through which cooling water passes is provided inside the intercooler, so that the heat of the supercharged intake air is heat-exchanged with the cooling water and cooled. The intake air cooling device 12 is arranged downstream of the supercharger 8 in the intake passage 4 and upstream of the throttle valve 214 .

As shown in FIG. 2, the intake air cooling device 12 is arranged above the internal combustion engine 2 and is connected to a first intake passage 4a facing upward from a supercharger 8 provided at the rear of the vehicle C. . The intake air cooling device 12 is connected to a second intake passage 4b extending upward from a throttle valve 214 provided in front of the vehicle C. As shown in FIG. The intake air cooler 12 has a temperature sensor 1204 . A temperature sensor 1204 measures the temperature of the intake air cooling device 12 . Temperature sensor 1204 is electrically connected to ECU 32 .

As shown in FIG. 1 , the engine water cooling device 14 is a device for cooling the internal combustion engine 2 . The engine water cooling device 14 has a first water passage 1402, a first radiator 1404, a first water pump 1406, a first fan 1408a, a second fan 1408b, and an engine water temperature detector 27.

The first water passage 1402 is a water passage that returns from the cylinder head 202 of the internal combustion engine 2 to the cylinder block 204 of the internal combustion engine 2 via the first radiator 1404 and the exhaust circulation gas cooling section 106 . The first radiator 1404 is provided in the first water passage 1402 and cools the cooling water that has passed through the engine cooling water passage of the internal combustion engine 2 (see the dashed line of the first water passage 1402 in FIG. 1) and the like. Further, as shown in FIG. 2, the first radiator 1404 is provided in front of the vehicle C, and is exposed to outside air from the front of the vehicle C, thereby exchanging heat between the outside air and the cooling water. Cooling. The first fan 1408a and the second fan 1408b are provided behind the vehicle C in the first radiator 1404, and draw outside air in front of the vehicle C. As shown in FIG. In this embodiment, the first fan 1408a and the second fan 1408b are electric fans driven by a motor and electrically connected to the ECU 32 (see FIG. 1).

As shown in FIG. 1 , the first water pump 1406 is provided either on the first water passage 1402 or on the engine cooling water passage of the internal combustion engine 2 and circulates the cooling water in the first water passage 1402 . In this embodiment, the first water pump 1406 is a mechanical pump that receives power from the crankshaft of the internal combustion engine 2 and rotates. However, first water pump 1406 may be an electrically driven pump.

The engine water temperature detection unit 27 is provided in a passage inside the internal combustion engine 2 of the first water passage 1402 (see the dashed line of the first water passage 1402 in FIG. 1) and detects the water temperature of the internal combustion engine 2 . The engine water temperature detector 27 is electrically connected to the ECU 32 .

The IC water cooling device 16 is a device for cooling the intake air cooling device 12 . The IC water cooling device 16 has a second water channel 1602 , a second radiator 1604 , a second water pump 1606 and an IC water temperature detector 1608 .

A second water channel 1602 is a water channel that returns from the intake air cooling device 12 to the intake air cooling device 12 via the second radiator 1604 . A second radiator 1604 is provided in a second water passage 1602 and cools the cooling water that has passed through the intake air cooling device 12 and is heated. In addition, as shown in FIG. 2, the second radiator 1604 is provided forward of the first radiator 1404 of the vehicle C, and is exposed to outside air from the front of the vehicle C, thereby generating heat between the outside air and the cooling water. Replace and cool the cooling water. In addition, the second water passage 1602 may be cooled via the supercharger 8 .

As shown in FIG. 1, the second water pump 1606 is an electric pump that is provided in the second water channel 1602 and circulates the cooling water in the second water channel 1602 . IC water temperature detector 1608 is provided on second water channel 1602 and measures the temperature of cooling water in second water channel 1602 . IC water temperature detector 1608 is electrically connected to ECU 32 .

The generator 18 is connected to the crankshaft of the internal combustion engine 2 via an accessory belt 1801 and is driven by the internal combustion engine 2 to generate electricity. In this embodiment, generator 18 is an alternator that charges storage battery 20 . However, if the vehicle C is a hybrid vehicle, the generator 18 may be a generator that supplies electric power to the drive motor. Alternatively, the generator 18 may be a rotating electrical machine (motor generator) that generates power and starts the internal combustion engine 2 .

The storage battery 20 stores electric power generated by the generator 18 and supplies electric power to devices such as the ECU 32 . The storage battery 20 is composed of a lithium ion battery, a nickel-cadmium battery, or the like, and is electrically connected to the generator 18 . The storage battery 20 may be a drive battery that supplies electric power to the drive motor, and in this case, is electrically connected to a generator driven by the internal combustion engine 2 .

The charging rate detector 30 is provided in the storage battery 20 . In the present embodiment, the charging rate detector 30 detects the terminal voltage of the storage battery 20 to calculate the charging rate of the storage battery 20 by the ECU 32 . Note that the charging rate may be estimated by the ECU 32 based on the voltage detected by the charging rate detection unit 30 .

Next, a functional configuration realized by software recorded in the ECU 32 will be described. The ECU 32 is actually configured by a microcomputer including an arithmetic unit, a memory, an input/output buffer, and the like. The ECU 32 controls various devices so that the condensed water treatment device 1 is in a desired operating state based on signals from each sensor and various devices, as well as maps and programs stored in memory. Various controls are not limited to processing by software, and can be processed by dedicated hardware (electronic circuits).

The calculator 22 is a functional configuration implemented by software that performs calculations necessary for controlling various devices. The calculator 22 calculates at least the amount of condensed water generated in the intake passage 4 of the internal combustion engine 2 . More specifically, the calculator 22 calculates the amount of water contained in the intake air from the amount of intake air and the humidity detected by the humidity sensor 29 . Further, the calculation unit 22 calculates the amount of exhaust circulation gas from the differential pressure detected by the differential pressure sensor 108, and calculates the amount of water contained in the exhaust circulation gas. On the other hand, the calculation unit 22 obtains the IC outlet temperature Tic near the outlet of the intake air cooling device 12 from the temperature of the temperature sensor 1204 of the intake air cooling device 12, and calculates the temperature change.

When the temperature near the outlet of the intake air cooling device 12 falls below the dew point temperature relative to the amount of water contained in the intake air and the amount of water contained in the exhaust circulating gas, the moisture is condensed in the vicinity of the outlet of the intake air cooling device 12. Stay. That is, the calculation unit 22 can calculate the estimated integrated amount Vr of condensed water generated near the outlet of the intake air cooling device 12 in the intake passage 4 by calculating the time during which the internal combustion engine 2 is operating and the dew point temperature is below. . This estimated integrated amount of condensed water Vr is an example of the amount of condensed water calculated by the calculator 22 .

Note that the dew point temperature of the moisture in the intake air may be stored in the ECU 32 as a map in association with the temperature near the outlet of the intake air cooling device 12 and the humidity of the intake air. Further, the dew point temperature in the exhaust circulating gas may be stored in the ECU 32 as a map in association with the temperature near the outlet of the intake air cooling device 12 and the amount of the exhaust circulating gas. As a result, the estimated integrated amount of condensed water Vr can be easily calculated from the time the dew point temperature is below the dew point temperature on the map, the amount of intake air, and the amount of circulating exhaust gas.

The instruction unit 24 is a functional configuration implemented by software that receives instructions regarding control of the internal combustion engine 2 and transmits the instructions to the control unit 26 . The instruction unit 24 transmits an automatic stop instruction to the control unit 26 when a condition for automatically stopping the internal combustion engine 2 is satisfied. Further, the instruction unit 24 transmits an instruction to stop the internal combustion engine 2 to the control unit 26 when the ignition switch is turned off (key off). The instruction unit 24 also transmits instructions necessary for controlling various devices to the control unit 26 .

The control unit 26 is a functional configuration realized by software for controlling various devices. The control unit 26 acquires values of various sensors, and controls various devices according to the calculation result of the calculation unit 22 and the instruction of the instruction unit 24 .

Next, the control procedure of the control section 26 of the present invention will be described with reference to the flow charts of FIGS. 3 and 4. FIG.

<Flowchart for automatic stop>
As shown in FIG. 3, the control unit 26 determines whether or not an instruction to automatically stop the internal combustion engine 2 has been received from the instruction unit 24 (S1). Here, the case where the instruction unit 24 automatically stops the internal combustion engine 2 means that the vehicle C is stopping or is about to stop, and that the internal combustion engine 2 and the exhaust purification catalyst 602 are capable of automatically stopping. This is the case when various conditions for stopping the internal combustion engine 2 are satisfied, such as when the warm-up is completed. Further, the instruction unit 24 instructs the control unit 26 to restart the internal combustion engine 2 when these conditions are no longer satisfied. That is, the internal combustion engine 2 does not warm up when restarting from an automatic stop.

When the control unit 26 receives an instruction to automatically stop the internal combustion engine 2 from the instruction unit 24 (S1 Yes), that is, when the stop is an automatic stop, the estimated integrated amount of condensed water Vr calculated by the calculation unit 22 is set to the first It is determined whether or not it is equal to or greater than a predetermined amount V1 (S2). When the control unit 26 determines that the estimated integrated amount of condensed water Vr is equal to or greater than the first predetermined amount V1 (Yes in S2), the control unit 26 acquires the engine water temperature Tw of the internal combustion engine 2 from the engine water temperature detection unit 27, and the engine water temperature Tw reaches the predetermined value. It is determined whether or not the water temperature is equal to or higher than Tw1 (S3).

Here, the state in which the engine water temperature Tw of the internal combustion engine 2 is higher than the predetermined water temperature Tw1 indicates a state in which the internal combustion engine 2 is sufficiently warmed up. That is, the control unit 26 is in a state where the instruction unit 24 has issued an automatic stop instruction after the internal combustion engine 2 has been sufficiently warmed up. In such a state, the condensed water easily evaporates and becomes gaseous, increasing the amount of condensed water contained in the intake air. This reduces the likelihood that the intake air will contain condensed water in a liquid state. As a result, the possibility of damage to the internal combustion engine 2 due to water hammer or the like is also reduced.

When the control unit 26 determines that the engine water temperature Tw is equal to or higher than the predetermined water temperature Tw1 (Yes in S3), the condensed water purge operation is performed at high speed (S4). . At this time, the control unit 26 closes the exhaust circulation valve 104 to stop exhaust circulation. This suppresses the formation of condensed water due to the moisture contained in the exhaust circulation gas. In addition, the control unit 26 controls the rotation of the first fan 1408a and the second fan 1408b to control the temperature of the intake air cooling device 12 so that the IC outlet temperature Tic in the vicinity of the exit of the intake air cooling device 12 falls within a predetermined temperature range. management (see Figure 4). This promotes evaporation of condensed water.

Here, operating the internal combustion engine 2 at high speed means setting the load of the generator 18 high and operating the internal combustion engine 2 at a higher engine speed than the idle speed. By operating the internal combustion engine 2 at high speed, the amount of condensed water that can be burned in the internal combustion engine 2 per unit time increases. Thereby, the condensed water can be treated in a short time.

If the control unit 26 determines that there is no instruction to automatically restart the internal combustion engine 2 from the instruction unit 24 (S5 No), the process returns to the start after the first predetermined time T1 has elapsed (S6 Yes). If the controller 26 determines that the first predetermined time T1 has not elapsed (S6 No), it continues the condensed water purge operation. If the controller 26 receives an instruction to automatically restart the internal combustion engine 2 (S5 Yes), it returns the process to the start. Further, when the control unit 26 determines that there is no instruction to automatically stop the internal combustion engine 2 (S1 No), the control unit 26 returns the process to the start without performing the condensed water purge operation.

On the other hand, when the controller 26 determines that the estimated integrated amount of condensed water Vr is smaller than the first predetermined amount V1 (S2 No), the estimated integrated amount of condensed water Vr is less than the first predetermined amount V1 and the second predetermined amount V2. It is determined whether or not the above is satisfied (S11). Here, the second predetermined amount V2 is an amount smaller than the first predetermined amount V1. When the control unit 26 determines that the estimated integrated amount of condensed water Vr is less than the first predetermined amount V1 and is equal to or greater than the second predetermined amount V2 (S11 Yes), the condensed water is burned in the internal combustion engine 2 and processed. A condensed water purge operation is performed at a low rotation speed (S12). At this time, the control unit 26 stops exhaust gas circulation and controls the temperature of the intake air cooling device 12, as in S4.

If there is no instruction to automatically restart the internal combustion engine 2 from the instruction unit 24 (S13 No), the control unit 26 returns the process to the start after the second predetermined time T2 has elapsed (S14 Yes). If the controller 26 determines that the second predetermined time T2 has not elapsed (S14 No), it continues the condensed water purge operation. If an instruction to automatically restart the internal combustion engine 2 is given (S13 Yes), the control unit 26 returns the process to the start. Further, when the control unit 26 determines that the estimated integrated amount of condensed water Vr is less than the second predetermined amount V2 (S11 No), the control unit 26 returns the process to the start without performing the condensed water purge operation.

When the control unit 26 determines that the engine water temperature Tw is lower than the predetermined water temperature Tw1 (S3 No), the condensed water purge operation, in which the condensed water is treated by burning it in the internal combustion engine 2, is performed at a low rotation speed (S12). . Here, the state in which the engine water temperature Tw of the internal combustion engine 2 is less than the predetermined water temperature Tw1 means that the internal combustion engine 2 can evaporate the condensed water even though the instruction unit 24 has issued an automatic stop instruction for idle stop. Indicates a non-warmed state. In such a state, evaporation of the condensed water is not promoted sufficiently, and the intake air may contain the condensed water in a liquid state. Therefore, when the engine water temperature Tw is lower than the predetermined water temperature Tw1, the control unit 26 performs the condensed water purge operation at a low speed to prevent the condensed water from being supplied to the internal combustion engine 2 in a liquid state.

In this way, the control unit 26 adjusts the time of the condensed water purge operation by varying the rotational speed of the internal combustion engine 2 according to the estimated integrated amount of condensed water Vr, thereby suppressing discomfort to the occupant. ing. Furthermore, the controller 26 increases the rotation speed of the internal combustion engine 2 as the estimated integrated amount Vr of condensed water increases. As a result, the amount of condensed water that can be treated per unit time is increased, and it is possible to prevent the condensed water purge operation from becoming long.

<Flow chart of temperature control of intake air cooling device>
Next, a control procedure for temperature management processing of the intake air cooling device 12 will be described.

As shown in FIG. 4, in the temperature management process for the intake air cooling device 12, the controller 26 determines whether or not the condensed water purge operation is being performed (S201). When the controller 26 determines that the condensed water purge operation is being performed (S201 Yes), it determines whether the IC outlet temperature Tic of the intake air cooling device 12 is equal to or lower than the first predetermined temperature Tic1 (S202). When the control unit 26 determines that the IC outlet temperature Tic is equal to or lower than the first predetermined temperature Tic1 (Yes in S202), the control unit 26 suppresses the rotation of the first fan 1408a and the second fan 1408b, thereby increasing the IC outlet temperature Tic. Fan suppression control (S203) is performed as described above. More specifically, the rotational speeds of first fan 1408a and second fan 1408b are suppressed, or only one of first fan 1408a and second fan 1408b is rotated. In any case, control unit 26 controls at least one of first fan 1408a and second fan 1408b so that intake air is not cooled by intake air cooling device 12 .

When the control unit 26 determines that the IC outlet temperature Tic is not equal to or lower than the first predetermined temperature Tic1 (No in S202) and when the fan suppression control (S203) is started, the IC outlet temperature Tic reaches the second predetermined temperature Tic. It is determined whether or not the temperature is equal to or higher than the temperature Tic2 (S204). Here, the second predetermined temperature Tic2 is a temperature higher than the first predetermined temperature Tic1. When the control unit 26 determines that the IC outlet temperature Tic is equal to or higher than the second predetermined temperature Tic2 (S204 Yes), it cancels the fan suppression control (S205), and rotates the first fan 1408a and the second fan 1408b again. and the intake air cooling device 12 is water-cooled. As a result, the control unit 26 prevents deterioration of the output performance and exhaust purification performance of the internal combustion engine 2 due to excessively warmed intake air.

When the control unit 26 determines that the IC outlet temperature Tic is lower than the second predetermined temperature Tic2 (S204 No), the process returns to before S202. Further, when the fan suppression control is canceled and when the condensed water purge operation is not being performed (S201 No), the control unit 26 returns the process to the start.

As described above, the condensed water treatment device 1 according to the present invention can treat the condensed water in a short period of time according to the amount of condensed water without impairing the output performance and exhaust purification performance of the internal combustion engine 2 . With the condensed water treatment apparatus 1 according to the present invention, when the amount of condensed water exceeds a predetermined amount, it is treated by burning. As a result, as shown in FIG. 2, even with a structure in which the intake air cooling device 12 is arranged above the internal combustion engine 2, the condensed water flows into the internal combustion engine 2, and the output performance and exhaust purification performance of the internal combustion engine 2 are improved. Damage can be suppressed.

<Other embodiments>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. In particular, multiple modifications described herein can be arbitrarily combined as required.

(a) In the present embodiment, timer control in which the condensed water purge operation time is the first predetermined time T1 and the second predetermined time T2 has been described as an example, but the present invention is not limited to this. The condensed water purge operation time may be set based on the estimated integrated amount of condensed water Vr or the like, or the condensed water purge operation time may be calculated from the estimated integrated amount of condensed water Vr or the like. That is, the condensed water purge operation should be performed for a predetermined period.

(b) In the present embodiment, suppression of rotation of the first fan 1408a and the second fan 1408b is given as an example of control for managing the temperature of the intake air cooling device 12, but the present invention is not limited to this. . In order to control the temperature of the intake air cooling device 12 , the rotation of the second water pump 1606 is suppressed or stopped, thereby suppressing the flow of the cooling water flowing through the intake air cooling device 12 . Temperature may be controlled.

(c) In the present embodiment, the condensed water purge operation is performed when the estimated integrated amount of condensed water Vr is greater than or equal to the first predetermined amount V1, and when it is less than the first predetermined amount V1 and greater than or equal to the second predetermined amount V2. , but the estimated integrated amount Vr of condensed water for performing the condensed water purge operation is not limited to this. That is, the rotational speed of the internal combustion engine 2 when performing the condensed water purge operation may be finely set according to the estimated integrated amount of condensed water Vr. More specifically, for example, a map that records the rotational speed of the internal combustion engine 2 when the condensed water purge operation is performed is stored in the ECU 32 according to the estimated integrated amount of condensed water Vr, and the condensed water purge operation is performed based on this map. may be performed.

(d) In the present embodiment, as an example of detecting the temperature of the internal combustion engine 2, the water temperature of the internal combustion engine 2 is detected by the engine water temperature detection unit 27, but the present invention is not limited to this. The temperature of the internal combustion engine 2 may be detected from oil temperature, intake air temperature, or the like. Also, the temperature of the internal combustion engine 2 may be estimated from these temperatures.

(e) In this embodiment, the control unit 26 performs the condensed water purge operation at high speed when the engine water temperature Tw of the internal combustion engine 2 is equal to or higher than the predetermined water temperature Tw1, and performs the condensed water purge operation when the water temperature Tw is less than the predetermined water temperature Tw1. Although the example in which the operation is performed at a low rotation speed has been described, the present invention is not limited to this. For example, the control unit 26 may linearly increase the rotational speed of the internal combustion engine 2 in the condensed water purge operation according to the engine water temperature Tw. That is, the controller 26 should increase the rotational speed of the internal combustion engine 2 in the condensed water purge operation as the temperature of the internal combustion engine 2 increases.

1: condensed water treatment device, 2: internal combustion engine, 4: intake passage, 12: intake air cooling device 20: storage battery, 22: calculation unit, 24: instruction unit, 26: control unit 27: engine water temperature detection unit (temperature detection unit )
Vr: estimated integrated amount of condensed water (amount of condensed water), C: vehicle, Tic: IC outlet temperature,
Tw: engine water temperature, V1: first predetermined value, V2: second predetermined value

Claims (5)

A condensed water treatment device for treating condensed water of an internal combustion engine mounted on a vehicle,
a calculation unit that calculates the amount of condensed water generated in the intake passage of the internal combustion engine;
an instruction unit that instructs to stop the internal combustion engine;
When the instructing unit instructs to stop the internal combustion engine, the speed of rotation of the internal combustion engine is varied according to the amount of condensed water calculated by the calculating unit, and the condensed water is burned in the internal combustion engine. a control unit that stops the internal combustion engine;
a condensate treatment device. The control unit increases the rotational speed of the internal combustion engine as the amount of condensed water increases.
The condensed water treatment device according to claim 1. Further comprising a temperature detection unit that detects the temperature of the internal combustion engine,
The control unit increases the rotation speed of the internal combustion engine as the temperature of the internal combustion engine increases.
The condensed water treatment device according to claim 1 or 2. The instruction unit performs an automatic stop instruction to automatically stop the internal combustion engine,
The control unit determines whether the stop is an automatic stop, and if the stop is an automatic stop, varies the rotation speed of the internal combustion engine and burns the condensed water in the internal combustion engine.
A condensed water treatment apparatus according to any one of claims 1 to 3. Further comprising a cooling device for cooling intake air of the internal combustion engine,
The control unit controls the outlet temperature of the cooling device to be within a predetermined temperature range when treating the condensed water.
A condensed water treatment apparatus according to any one of claims 1 to 4.

Images