阅读说明：本技术 格栅风门控制装置 (Grille air door control device ) 是由 铃木一弘 于 2020-03-13 设计创作，主要内容包括：格栅风门控制装置以还考虑到车辆的冷却性能以外的性能的方式控制格栅风门的开闭。格栅风门控制装置是对搭载有内燃机的车辆的格栅风门的开闭进行控制的格栅风门控制装置,控制装置(106)具有：逻辑选择部(107),其基于发动机(101)的排气管(K1)内的气氛温度,从用于决定格栅风门(21)的开度的多个开度决定逻辑中选择一个逻辑；以及逻辑执行部(108),其通过执行由逻辑选择部(107)选择的一个逻辑来对格栅风门(21)的开闭进行控制。(The grille shutter control device controls opening and closing of the grille shutter in consideration of performance other than cooling performance of the vehicle. A grille shutter control device controls opening and closing of a grille shutter of a vehicle mounted with an internal combustion engine, and the control device (106) is provided with: a logic selection unit (107) that selects one of a plurality of opening degree determination logics for determining the opening degree of a grille shutter (21) on the basis of the atmospheric temperature in an exhaust pipe (K1) of an engine (101); and a logic execution unit (108) that controls the opening and closing of the grille shutter (21) by executing one of the logics selected by the logic selection unit (107).)

1. A grille shutter control device that controls opening and closing of a grille shutter of a vehicle mounted with an internal combustion engine, the grille shutter control device comprising:

a logic selection unit that selects one of a plurality of opening degree determination logics for determining an opening degree of the grille shutter, based on an ambient temperature in an exhaust pipe of the internal combustion engine; and

a logic executing section that controls opening and closing of the grille shutter by executing the one logic selected by the logic selecting section.

2. The grille shutter control device of claim 1, wherein,

the plurality of opening degree determination logics include a first logic in which the temperature of the atmosphere is most preferentially increased and a second logic in which the fuel consumption performance of the vehicle is most preferentially considered.

3. The grille shutter control device of claim 2, wherein,

the logic selection unit selects the first logic when the ambient temperature is equal to or lower than a threshold value, and selects the second logic when the ambient temperature is higher than the threshold value.

4. The grille shutter control device of any one of claims 1 to 3, wherein,

when the one logic is executed in a state where the grill shutter is open, the logic executing section controls the opening and closing of the grill shutter based on a condition that the state of the grill shutter is not easily changed, as compared to a case where the one logic is executed in a state where the grill shutter is closed.

Technical Field

The present invention relates to a grille shutter control device that controls opening and closing of a grille shutter of a vehicle in which an internal combustion engine is mounted.

Background

Conventionally, there is known a vehicle mounted with a grille shutter for adjusting an air volume of traveling air sucked into an engine room housing a heat exchanger such as an air conditioning condenser, an intercooler, and a radiator of the vehicle (for example, patent document 1). Such a grille shutter is provided at a front opening portion of an engine room of a vehicle, and the opening degree thereof is controlled based on the temperature of cooling water for cooling an internal combustion engine or the like.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-167832.

Disclosure of Invention

Problems to be solved by the invention

However, conventionally, the grille shutter is opened and closed in consideration of the cooling performance of the internal combustion engine of the vehicle, and there is room for improvement in controlling the opening and closing of the grille shutter in consideration of performance other than the cooling performance.

The purpose of the present invention is to provide a grille shutter control device that can control the opening and closing of a grille shutter in consideration of performance other than cooling performance of an internal combustion engine of a vehicle.

Means for solving the problems

A grille shutter control device according to the present invention controls opening and closing of a grille shutter of a vehicle mounted with an internal combustion engine, the grille shutter control device including: a logic selection unit that selects one of a plurality of opening degree determination logics for determining an opening degree of the grille shutter, based on an ambient temperature in an exhaust pipe of the internal combustion engine; and a logic execution unit that controls opening and closing of the grille shutter by executing the one logic selected by the logic selection unit.

Effects of the invention

According to the present invention, the opening and closing of the grille shutter can be controlled in consideration of performance other than the cooling performance of the vehicle.

Drawings

Fig. 1 is a schematic diagram showing the configuration of an engine room of a vehicle provided with a grille shutter controlled by a grille shutter control device according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing the structure of a vehicle including a grille shutter control device according to an embodiment of the present invention.

Fig. 3 is a flowchart showing an operation in a case where the grille shutter of the grille shutter control device according to the embodiment of the present invention is closed.

Fig. 4 is a flowchart showing an operation in a case where the grille shutter of the grille shutter control device according to the embodiment of the present invention is opened.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings as appropriate.

< Structure of Engine Chamber of vehicle >

Hereinafter, the structure of an engine room of a vehicle in which a grille shutter control device according to an embodiment of the present invention is mounted will be described in detail with reference to fig. 1.

An engine room 1 of a vehicle in which the grille shutter control device of the present embodiment is mounted includes a grille 2, a condenser 3, an intercooler 4, and a radiator 5.

The front grille 2 is provided at the forefront of an engine room of a vehicle and has a structure that traveling wind from the front can pass rearward. The front grille 2 is provided with a grille shutter 21 that can be opened and closed.

The condenser 3 is provided in a refrigerant circulation path of an air conditioner, not shown, and cools the refrigerant.

The intercooler 4 cools air compressed by a turbocharger described later and sends the cooled air to the internal combustion engine.

The radiator 5 is provided in a circulation path of the coolant of the internal combustion engine, and cools the coolant that absorbs heat of the internal combustion engine.

< Structure of vehicle >

Hereinafter, the structure of vehicle 100 according to the embodiment of the present invention will be described in detail with reference to fig. 2.

The vehicle 100 includes an intercooler 4, an engine 101, an air cleaner 102, a turbocharger 103, an aftertreatment device 104, an EGR (Exhaust Gas Recirculation) device 105, and a grille shutter control device 106.

The engine 101 is an internal combustion engine. The engine 101 takes in air from the intercooler 4, burns a mixed gas of fuel injected from a fuel injection valve not shown and the taken-in air, and drives the vehicle by a driving force generated by the combustion.

The air cleaner 102 sucks in outside air, removes dust and the like contained in the sucked outside air, and sends the outside air from which the dust and the like have been removed to the turbocharger 103.

The turbocharger 103 drives a compressor, not shown, by using exhaust gas of the engine 101, and sends the exhaust gas to the aftertreatment device 104. The turbocharger 103 compresses air sent from the air cleaner 102 by a compressor, and sends the compressed air to the intercooler 4.

The aftertreatment device 104 is provided in the exhaust pipe K1, includes an oxidation catalyst, a filter, an SCR (Selective Catalytic Reduction) catalyst, or the like, and purifies exhaust gas from the turbocharger 103 by the filter or the catalyst and discharges the exhaust gas to the outside.

The EGR device 105 returns a part of the exhaust gas of the engine 101 to the engine 101.

The grille shutter Control device 106 is constituted by an Electronic Control Unit (ECU) or the like, and operates by executing a Control program stored in a memory (not shown). The grille shutter control device 106 controls the opening and closing of the grille shutter 21 based on the atmospheric temperature of the exhaust pipe K1 detected by a temperature sensor provided in the post-processing device 104.

Specifically, the grille shutter control device 106 includes a logic selector 107 and a logic actuator 108 as functional blocks. The logic selection unit 107 obtains the atmospheric temperature in the exhaust pipe K1 based on the detection result of the sensor provided in the aftertreatment device 104 for measuring the temperature of the exhaust gas or the catalyst. The logic selector 107 selects one logic from a plurality of opening degree determination logics for determining the opening degree of the grille shutter 21 based on the obtained atmospheric temperature in the exhaust pipe K1. The logic executing unit 108 controls the opening and closing of the grille shutter 21 by executing one of the logics selected by the logic selecting unit 107.

< operation of grille shutter control device >

Hereinafter, the operation of the grille shutter control device 106 according to the embodiment of the present invention will be described in detail with reference to fig. 3 and 4.

First, the grille shutter 21 is in a closed (closed) state (S1).

Then, the grille shutter control device 106 does not operate when the ignition switch of the vehicle is kept off (S2: No). On the other hand, the grille shutter control device 106 starts its operation when the ignition switch of the vehicle has been switched from the off state to the on state (yes at S2). Then, the logic selector 107 determines whether or not the catalyst temperature of the aftertreatment device 104 indicating the atmospheric temperature in the exhaust pipe K1 is greater than a threshold value (S3).

When the catalyst temperature is higher than the threshold value (yes in S3), the logic selection unit 107 selects a fuel economy priority mode logic that prioritizes fuel consumption performance as one of the opening degree determination logics for determining the opening degree of the grille shutter 21. Then, the logic execution unit 108 executes the logic of the fuel efficiency priority mode selected by the logic selection unit 107, and determines whether or not the in-vehicle air conditioner is operating (S4).

When the air conditioner is operating (yes in S4), the logic execution unit 108 makes the following determinations: if the grill shutter 21 is in the closed state, the performance of the air conditioner does not meet the predetermined standard (S5).

If the performance of the air conditioner cannot exhibit the required performance (air conditioning performance does not reach (NG)) (S5: yes), logic execution unit 108 opens grille shutter 21 to suck more outside air into engine room 1 (S6).

On the other hand, when the air conditioner is not operating (S4: no), or when the performance of the air conditioner can exhibit the required performance (the air conditioner performance does not meet the standard) (S5: no), the logic performing unit 108 determines whether or not the weakened portion is larger than the optimized aerodynamic performance of the vehicle by closing the grille shutter 21 (S7): a portion where fuel consumption is deteriorated due to an increase in the air temperature at the discharge port of the intercooler 4, and is impaired from optimization of fuel consumption by not driving the air conditioner.

The logic executing unit 108 opens the grille shutter 21 when the fuel consumption is deteriorated due to an increase in the air temperature at the discharge port of the intercooler 4 and the portion attenuated from the optimization of the fuel consumption by not driving the air conditioner is larger than the optimization of the fuel consumption based on the aerodynamic performance (S7: yes) (S6).

On the other hand, the logic performing unit 108 determines whether or not the water temperature of the cooling water of the engine 101 is greater than the threshold value when the optimization of the fuel economy by the aerodynamic performance is larger than the portion where the fuel economy is impaired from the optimization of the fuel economy by not driving the air conditioner due to the deterioration of the fuel economy caused by the increase in the air temperature at the discharge port of the intercooler 4 (S7: no) (S8).

When the water temperature is higher than the threshold value (yes in S8), logic unit 108 opens grille shutter 21 to suck more outside air into engine compartment 1 (S6).

On the other hand, when the water temperature is equal to or lower than the threshold value (NO in S8), the logic executor 108 returns to the operation of step S1. In this way, when the logic of the fuel efficiency priority mode is executed, the grille shutter control device 106 comprehensively determines not only the aerodynamic performance improvement effect by closing the grille shutter 21 but also various fuel efficiency fluctuation factors that change with the opening and closing of the grille shutter 21, and controls the opening and closing of the grille shutter 21. Therefore, by executing the logic of the fuel consumption priority mode, the fuel consumption performance of the vehicle can be given the highest priority.

When the catalyst temperature is equal to or lower than the threshold value (no in S3), the logic selection unit 107 selects a logic of the warm-up priority mode in which heating of the aftertreatment device 104 is prioritized as one of the opening degree determination logics for determining the opening degree of the grille shutter 21. Then, the logic executing unit 108 executes the logic of the warm-up priority mode selected by the logic selecting unit 107, and determines whether or not the in-vehicle air conditioner is operating (S9).

When the air conditioner is operating (yes in S9), the logic execution unit 108 makes the following determinations: if the grill shutter 21 is in the closed state, the performance of the air conditioner does not meet the predetermined standard (S10).

When the performance of the air conditioner does not satisfy the predetermined condition (yes in S10), logic execution unit 108 opens grille shutter 21 to suck more outside air into engine compartment 1 (S6).

On the other hand, when the air conditioner is not operating (no in S9) or when the performance of the air conditioner reaches a predetermined standard (no in S10), logic executor 108 determines whether or not the water temperature of the coolant of engine 101 is greater than a threshold (S11).

When the water temperature is higher than the threshold value (yes in S11), logic unit 108 opens grille shutter 21 to suck more outside air into engine compartment 1 (S6).

On the other hand, when the water temperature is equal to or lower than the threshold value (NO in S11), the logic executor 108 returns to the operation of step S1.

In this way, when the logic of the warm-up priority mode is executed, the grille shutter control device 106 does not open the grille shutter 21 unless the cooling air is supplied into the engine compartment. That is, the temperature of the air at the outlet of the intercooler 4 is increased, and the temperature of the exhaust gas is increased. Therefore, by executing the logic of the warm-up priority mode, it is possible to give the highest priority to increasing the ambient temperature of the aftertreatment device 104.

In either the fuel economy priority mode or the warm-up priority mode, after the grille shutter 21 is opened (S6), the grille shutter control device 106 determines whether the ignition switch of the vehicle is in an on state (S12).

When the ignition switch is turned off (S12: no), the grille shutter control device 106 ends the operation.

On the other hand, when the ignition switch is kept in the ON state (YES in S12), the logic selector 107 determines whether or not the catalyst temperature of the aftertreatment device 104 is higher than a threshold value (S13).

When the catalyst temperature is higher than the threshold value (yes in S13), the logic selection unit 107 selects the logic of the fuel efficiency priority mode. Then, the logic execution unit 108 executes the logic of the fuel efficiency priority mode selected by the logic selection unit 107, and determines whether or not the in-vehicle air conditioner is operating (S14).

When the air conditioner is operating (yes in S14), the logic execution unit 108 makes the following determinations: if the grill shutter 21 is in the closed state, the performance of the air conditioner cannot be exhibited as required (S15). Here, in step S15, as the threshold value for determining whether or not the performance required for the air conditioner cannot be exhibited, a value is set which makes it easier to determine that the performance required for the air conditioner cannot be exhibited in the determination than the threshold value used in step S5. That is, the conditions for opening the grill shutter 21 are different from the conditions for closing the grill shutter 21. This prevents the grille shutter 21 from being closed immediately when the condition for opening the grille shutter 21 is not satisfied. Thereby preventing the grill shutter 21 from being repeatedly opened and closed.

If the performance of the air conditioner cannot be exhibited when the grille shutter 21 is in the closed state (yes in S15), the logic execution unit 108 keeps the grille shutter 21 in the open state (S6).

On the other hand, when the air conditioner is not operating (S14: no), or when the performance of the air conditioner can exhibit the required performance (S15: no), the logic performing unit 108 determines whether or not the weakened portion is larger than the optimum aerodynamic performance of the vehicle achieved by closing the grille shutter 21 (S16): a portion where fuel consumption is deteriorated due to an increase in the air temperature at the discharge port of the intercooler 4, and is impaired from optimization of fuel consumption by not driving the air conditioner. Here, each parameter used for the determination in step S16 is adjusted to a parameter that makes it easier to make the determination result "yes" than each parameter used in step S7. That is, it is easier to determine that the optimization of the aerodynamic performance is smaller in step S16 than in step S7. This prevents the grille shutter 21 from being closed immediately when the condition for opening the grille shutter 21 is not satisfied. Thereby preventing the grill shutter 21 from being repeatedly opened and closed.

The logic execution unit 108 keeps the grille shutter 21 open when the fuel consumption is deteriorated due to an increase in the air temperature at the discharge port of the intercooler 4 and the portion attenuated from the optimization of the fuel consumption by not driving the air conditioner is larger than the optimization of the fuel consumption based on the aerodynamic performance (S16: yes) (S6).

On the other hand, the logic performing unit 108 determines whether or not the water temperature of the cooling water of the engine 101 is greater than the threshold value when the optimization of the fuel economy by the aerodynamic performance is larger than the portion where the fuel economy is impaired from the optimization of the fuel economy by not driving the air conditioner due to the deterioration of the fuel economy caused by the increase in the air temperature at the discharge port of the intercooler 4 (S16: no) (S17). Here, in step S17, the threshold value to be compared with the water temperature is set to a value smaller than the threshold value to be compared with the water temperature in step S8. In this way, by controlling the opening and closing of the grille shutter 21 based on the condition that the grille shutter 21 is not easily closed after the grille shutter 21 is opened, it is possible to prevent the grille shutter 21 from being repeatedly opened and closed.

When the water temperature is higher than the threshold value (yes in S17), logic unit 108 keeps grille shutter 21 open to allow more outside air to be drawn into engine compartment 1 (S6).

On the other hand, when the water temperature is equal to or lower than the threshold value (NO in S17), the logic executor 108 closes the grille shutter 21 (S1).

Thus, the grille shutter control device 106 executes the logic of the fuel efficiency priority mode, thereby giving the highest priority to the fuel efficiency of the vehicle.

When the catalyst temperature is equal to or lower than the threshold value (no in S13), the logic selection unit 107 selects the logic of the warm-up priority mode. Then, the logic executing unit 108 executes the logic of the warm-up priority mode selected by the logic selecting unit 107, and determines whether or not the in-vehicle air conditioner is operating (S18).

When the air conditioner is operating (yes in S18), the logic execution unit 108 makes the following determinations: if the grill shutter 21 is in the closed state, the performance of the air conditioner does not meet the predetermined standard (S19). Here, in step S19, as the threshold value for determining whether or not the performance required for the air conditioner cannot be exhibited, a value is set which makes it easier to determine that the performance required for the air conditioner cannot be exhibited in the determination than the threshold value used in step S10. That is, the conditions for opening the grill shutter 21 are different from the conditions for closing the grill shutter 21. This prevents the grille shutter 21 from being closed immediately when the condition for opening the grille shutter 21 is not satisfied. Thereby preventing the grill shutter 21 from being repeatedly opened and closed.

If the performance of the air conditioner cannot be exhibited when the grille shutter 21 is in the closed state (yes in S19), the logic execution unit 108 opens the grille shutter 21 to suck more outside air into the engine room 1 (S6).

On the other hand, when the air conditioner is operating (no in S18) or when the performance of the air conditioner can exhibit the required performance (no in S19), the logic performing unit 108 determines whether or not the water temperature of the coolant of the engine 101 is greater than a threshold value (S20). Here, in step S20, the threshold value to be compared with the water temperature is set to a value smaller than the threshold value to be compared with the water temperature in step S11. In this way, by controlling the opening and closing of the grille shutter 21 based on the condition that the grille shutter 21 is not easily closed after the grille shutter 21 is opened, it is possible to prevent the grille shutter 21 from being repeatedly opened and closed.

When the water temperature is higher than the threshold value (yes in S20), logic unit 108 opens grille shutter 21 to suck more outside air into engine compartment 1 (S6).

On the other hand, when the water temperature is equal to or lower than the threshold value (NO in S20), the logic executor 108 returns to the operation of step S1.

In this way, the grill shutter control device 106 executes the logic of the warm-up priority mode, thereby giving the highest priority to increasing the ambient temperature of the aftertreatment device 104.

According to the present embodiment, the opening and closing of the grille shutter 21 can be controlled in consideration of performance other than the cooling performance of the vehicle by selecting one logic from a plurality of opening degree determination logics for determining the opening degree of the grille shutter 21 based on the atmospheric temperature in the exhaust pipe K1 of the internal combustion engine and executing the selected one logic to control the opening and closing of the grille shutter 21.

It is to be noted that the type, arrangement, number, and the like of the members of the present invention are not limited to the above-described embodiments, and it is needless to say that the components can be appropriately replaced with those having equivalent functions and effects, and the like, and the modifications can be appropriately made within the scope not departing from the gist of the present invention.

Specifically, in the above-described embodiment, the oxidation catalyst or the SCR catalyst is provided in the aftertreatment device 104, but a catalyst other than the oxidation catalyst or the SCR catalyst that can decompose NOx may be used in the aftertreatment device 104.

In the above embodiment, the measured value of the sensor is used as the ambient temperature in the exhaust pipe K1, but the estimated value of the ambient temperature in the exhaust pipe K1 may be used as the ambient temperature in the exhaust pipe K1. In this case, the following values may be used as the estimated value of the atmospheric temperature in the exhaust pipe K1: the heat capacity of the aftertreatment device 104 is divided by a value obtained by adding the heat quantity of the aftertreatment device 104 to the heat quantity of the exhaust gas obtained by the aftertreatment device 104. The amount of heat obtained from the exhaust gas by the aftertreatment device 104 can be determined from the flow rate of the exhaust gas, the temperature difference between the input and output portions of the catalyst, and the specific heat or specific gravity of the exhaust gas.

The logic for determining the opening degree of the grille shutter 21 is not limited to the 2 logics described above, and various logics may be employed as the logic to be selected and executed.

The present application is based on the japanese patent application (japanese patent application 2019-046467) filed 3/13 in 2019, the contents of which are incorporated herein by reference.

Industrial applicability

The grille shutter control device of the present invention is suitable for controlling opening and closing of a grille shutter of a vehicle mounted with an internal combustion engine.

Description of the reference numerals

1 Engine room

2 front grilles

3 condenser

4 intercooler

5 Heat sink

21 grille air door

100 vehicle

101 engine

102 air filter

103 turbocharger

104 post-processing device

105EGR device (exhaust gas recirculation device)

106 grille shutter control device

107 logic selection part

108 logic execution part

K1 exhaust pipe.