KR102335991B1 - Apparatus for controlling engine and method thereof - Google Patents

Abstract

The present invention relates to an engine control device and method for controlling coolant flow rate distribution,
An apparatus for controlling an engine of a vehicle according to an embodiment of the present invention includes: an integrated flow control valve in which opening degrees of a plurality of valves are adjusted by rotation of a cam; and determining whether the opening control of the radiator valve is required among the plurality of valves according to the state of the integrated flow control valve, and when the opening control of the radiator valve is required, the accelerator pedal depression amount, and engine revolution per minute (RPM) It may include a control unit for controlling the opening amount of the radiator valve by using the.

Description

Engine control device and method thereof

The present invention relates to a vehicle engine control apparatus and method, and more particularly, to a technology for controlling a coolant flow rate distribution in a gasoline engine.

Recently, vehicles are focusing on the development of next-generation engines and transmissions focusing on three core tasks: high fuel efficiency, practical performance, and eco-friendliness.

Accordingly, technology application and development of parts for gasoline engines and transmissions are being actively discussed in various ways. For example, fuel economy of about 10% or more is greatly improved compared to existing gasoline models through the optimal combination of engine and transmission. Thus, we are striving to develop technologies that satisfy the needs of our customers and are competitive in terms of performance and durability.

This vehicle engine development is to respond to the intensifying fuel efficiency and environmental regulations by country and to meet the various expectations of drivers for vehicle performance to improve actual fuel efficiency, improve practical performance, and reduce emissions.

To this end, various coolant temperature control technologies that distribute coolant from the integrated flow control valve in the engine to the engine radiator, transmission oil warmer, and heater are under discussion, and specific measures to improve fuel efficiency are absolutely necessary.

An embodiment of the present invention provides a vehicle engine control apparatus and method for controlling coolant flow rate distribution in consideration of an accelerator pedal value and an engine rotation speed (revolution per minute, RPM) when controlling the opening of a radiator valve of an integrated flow control valve would like to provide

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

An apparatus for controlling an engine of a vehicle according to an embodiment of the present invention includes: an integrated flow control valve in which opening degrees of a plurality of valves are adjusted by rotation of a cam; and determining whether the opening control of the radiator valve is required among the plurality of valves according to the state of the integrated flow control valve, and when the opening control of the radiator valve is required, the accelerator pedal depression amount, and engine revolution per minute (RPM) It may include a control unit for controlling the opening amount of the radiator valve by using the.

In an embodiment, the control unit checks whether the accelerator pedal depression amount exceeds a preset threshold value, and when it is confirmed that the accelerator pedal depression amount exceeds the preset threshold value, the radiator valve operates in full open mode. It may include a control box.

In an embodiment, the control unit checks whether the RPM exceeds a first threshold value, and when it is confirmed that the RPM exceeds the first threshold value, the radiator valve is opened by a preset first angle It may include a control box.

In an embodiment, the control unit determines whether the RPM exceeds a second threshold greater than a preset first threshold, and when it is confirmed that the RPM exceeds the second threshold, the radiator valve is set in advance It may include controlling to open by a second angle greater than the first angle.

In an embodiment, the control unit may include determining the coolant temperature of the integrated flow control valve and determining that opening control of the radiator valve is necessary when the coolant temperature is higher than a predetermined threshold value.

In an embodiment, the control unit may include controlling the opening amount so that each of the plurality of valves have different opening angles.

In one embodiment, the control unit may include controlling the flow rate of the coolant by adjusting the rotation angle of the cam of each of the plurality of valves.

A method for controlling an engine of a vehicle according to an embodiment of the present invention includes: checking a state of an integrated flow control valve in which opening degrees of a plurality of valves are adjusted by rotation of a cam; determining whether opening control of a radiator valve among the plurality of valves is required according to the state of the integrated flow control valve; checking an accelerator pedal depression amount and engine revolution per minute (RPM) when opening control of the radiator valve is required; and controlling an opening amount of the radiator valve using a depression amount of the accelerator pedal and the engine RPM.

In an embodiment, the controlling of the opening degree of the radiator valve may include: checking whether the accelerator pedal depression amount exceeds a preset threshold value; and controlling the radiator valve to fully open when it is confirmed that the accelerator pedal depression amount exceeds the set threshold value.

In an embodiment, the controlling of the opening degree of the radiator valve includes checking whether the RPM exceeds a preset first threshold value, and checking whether the RPM exceeds the first threshold value, the radiator valve may include controlling to be opened by a preset first angle.

In one embodiment, the step of controlling the opening degree of the radiator valve,

Check whether the RPM exceeds a second threshold greater than a preset first threshold, and when it is confirmed that the RPM exceeds the second threshold, the radiator valve is opened by a second angle greater than the first angle It may further include the step of controlling.

In an embodiment, the checking of the state of the integrated flow control valve may include checking the coolant temperature of the integrated flow control valve.

In an embodiment, the determining whether the opening control of the radiator valve is necessary may include determining that the opening control of the radiator valve is necessary when the coolant temperature is greater than a predetermined threshold value.

In an embodiment, the method may further include controlling an opening amount of each of the plurality of valves so that each of the plurality of valves has a different opening angle.

In an embodiment, the controlling of the respective opening degrees may include controlling the flow rate of the coolant by adjusting the rotation angle of the cams of each of the plurality of valves.

This technology can control so that excessive differential pressure does not occur at the front and rear ends of the integrated flow control valve (ITM). That is, by controlling the cam angle of the ITM using the pedal value and the RPM signal, the valve is operated to open before the RPM rises, thereby minimizing the differential pressure generation. Therefore, it has the effect of preventing in advance that an excessive load acts on the valve stem part of the integrated flow control valve.

In addition, various effects directly or indirectly identified through this document may be provided.

1 is a block diagram showing the configuration of an engine control apparatus according to an embodiment of the present invention.
2 is a view schematically showing the structure of the integrated flow control valve and the cam according to the present invention.
3 is a signal flow diagram illustrating a process of performing integrated flow control according to an example of the present invention.
4 is a graph showing the change in the angle of the integrated flow control valve according to the pedal value according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4 .

1 is a block diagram showing the configuration of an engine control apparatus according to an embodiment of the present invention. In particular, it is a diagram schematically showing the configuration of a cooling system according to the present invention.

Referring to FIG. 1 , an integrated thermal management (ITM) is a device that intelligently supplies cooling water according to the engine temperature. It may include a valve for controlling the flow rate or the flow rate of the coolant coming from the cylinder head or cylinder block side. The valve may control the flow rate of the coolant by adjusting the rotation angle of the cam. In this regard, the cam/valve structure of the integrated flow control valve according to the present invention will be briefly described below with reference to FIG. 2 .

To cool the engine, the coolant circulates between the radiator and the engine and the heat of the engine must be released to the radiator. It circulates the water pump, the oil cooler that cools the engine oil, and the heater core that discharges the heat of the coolant into the interior of the vehicle.

In this integrated flow control valve control logic, the PID gain value is determined by the difference between the target water temperature and the current water temperature, and the cam angle (valve open) is set accordingly. Here, PID is one of the automatic control methods, and is a method of performing control by a combination of P: Proportinal (proportional), I: Integral (integral), and D: Differential (differential). PID is used as an essential function in actuators, autonomous vehicles, robots, and sensor value calibration. The coefficient value (Gain value) for each PID item should be appropriately set according to the type of actuator that produces the physical quantity.

Referring to FIG. 1 , the vehicle engine control device includes a radiator 110 , an oil cooler 120 , a heater 130 , an engine 140 , a water pump 150 , an integrated flow control valve 160 , and a control unit ( 170). The integrated flow control valve 160 includes a plurality of valves for sending coolant to the radiator 110 , the oil cooler 120 , the heater 130 , and the like, and the opening degree of the plurality of valves is controlled by the controller 170 . .

The control unit 170 determines whether the opening control of the radiator valve is required among the plurality of valves according to the state of the integrated flow control valve, and when the opening control of the radiator valve is required, the accelerator pedal depression amount, and the engine revolution per minute (RPM) ) can be used to control the opening degree of the radiator valve.

The controller 170 may check whether the accelerator pedal depression amount exceeds a preset threshold value A, and when it is confirmed that the accelerator pedal depression amount exceeds the preset threshold value, the controller 170 may control the radiator valve to operate fully open.

The control unit 170 checks whether the RPM exceeds a preset first threshold value (B), and when it is confirmed that the RPM exceeds the first threshold value, the radiator valve moves to a preset first angle (eg, 85°) ) can be controlled to open as much as

The control unit 170 checks whether the RPM exceeds a second threshold value (C) greater than a preset first threshold value, and when it is confirmed that the RPM exceeds the second threshold value, the radiator valve is set to a preset second threshold value. It can be controlled to be opened by a second angle (eg, 115°) greater than one angle.

The control unit 170 may check the cooling water temperature of the integrated flow control valve, and if the cooling water temperature is higher than a predetermined threshold value, it may be determined that the opening control of the radiator valve is necessary. That is, when the coolant temperature is high, the controller 170 may open the radiator valve to control the coolant temperature to be lowered.

The controller 170 may control the opening amount so that each of the plurality of valves has different opening angles, and may control the flow rate of the coolant by adjusting the rotation angle of the cam of each of the plurality of valves.

2 is a view schematically showing the structure of the integrated flow control valve and the cam according to the present invention.

Referring to FIG. 2 , in the cam of the integrated flow control valve, when the cam 201 rotates at a predetermined angle, cooling water flows at the lower end of the valve. It is a structure that prevents the opening of the valve. That is, when the cam 201 of the integrated flow control valve rotates at a predetermined angle, the inclined surface of the cam presses the end of the valve 204 to open the valve, and the spring 203 is the opposite of the direction in which the cam presses the valve. plays a role in pushing At this time, the opening and closing is due to the height formed in the thickness direction of the cam.

In this case, the cam is configured as a disk-shaped plate and may have a shape in which a 'road' curved in the thickness direction of the cam plate is formed so that a plurality of cams can be vertically pressed. Accordingly, as the cam rotates, the corresponding valve is pressed according to the thickness of the curved road and can move up and down.

As described above, the integrated flow control valve control logic operates to open the valve when the cooling water temperature rises above the predetermined water temperature, and completely closes the valve when the cooling water temperature decreases. At this time, if the moment when the radiator valve is closed and the moment when the RPM rises overlap, or the RPM rise rate is faster than the time of opening the valve of the ITM, the differential pressure between the front and rear ends of the radiator valve rises rapidly, so that an excessive load is applied to the valve stem. can

Accordingly, in the present invention, in order to minimize the differential pressure between the front and rear ends of the valve in the engine to which the integrated flow control valve (ITM) system is applied, the cam of the integrated flow control valve is performed using the engine revolutions per minute (RPM) and the pedal value. (Valve open) to determine the angle. In the present invention, this is defined as feed forward logic, and by adding the feed forward, a method for controlling the control valve to move faster than the RPM rise is disclosed.

3 is a signal flow diagram illustrating a process of performing integrated flow control according to an example of the present invention. Hereinafter, as an example, in the present invention, it is assumed that A = 70, B = 3000, and C = 4000.

Referring to FIG. 3 , it is checked whether the state of the integrated flow control valve is 'Integrated flow control valve State = Cool' (300), where the state of the integrated flow control valve is "Cool" means that the coolant temperature drops It shows the state of the valve for triggering, that is, the radiator valve of the integrated flow control valve needs to be opened.

At this time, the engine control device of the vehicle checks the RPM and checks whether the checked RPM exceeds a predetermined threshold value A% ( 305 ). That is, it is checked whether the detected pedal value > A%. For example, it is assumed that the predetermined threshold value A is, for example, 70. A is an experimental value to ensure engine performance, and may be set to a different value to ensure performance later.

When the detected pedal value exceeds a predetermined threshold value of 70% (Y), the engine control device controls to operate as 'ITM angle = radiator full open' ( 310 ).

If the checked RPM does not exceed the threshold value A% (N), the engine control apparatus checks whether the measured RPM exceeds a predetermined threshold value B (320). For example, it is assumed that the predetermined threshold value B is 3000. B is an experimental value to ensure engine performance, and may be set to a different value to ensure future performance. If the checked RPM exceeds the predetermined threshold B (Y), the ITM angle is controlled to be set to a preset D (325). Here, D is an experimental value to ensure engine performance, and can be set to a different value to ensure performance later, for example, D may be set to 85°.

Meanwhile, the engine control device checks whether the measured RPM exceeds a predetermined threshold value C ( 330 ). If it exceeds the predetermined threshold value C of the identified RPM (Y), the ITM angle is controlled to be set to a preset E (335). Here, E is an experimental value to ensure engine performance, and can be set to a different value to ensure future performance, for example, E may be set to 115°. In addition, the predetermined threshold value C is an experimental value for guaranteeing engine performance, and may be set to a different value in order to guarantee future performance, for example, may be set to 4000.

On the other hand, when the detected pedal value is less than or equal to the preset threshold value A% and the RPM value is less than or equal to the preset threshold value B, the engine control device performs the coolant temperature PID control for the integrated flow control valve control. Perform (340).

Here, Table 1 below shows the angle table of the integrated flow control valve according to the PID gain value, where the X axis represents the ITM angle (= RVC_AV), and the Y axis represents the RPM (= N).

As shown in Table 1, the ITM opening angle is changed by RPM 3000, 3500, 4000.

In the present invention, as an example, when 5000 RPM or more and the condition that the ITM starts to open meet, the excessive differential pressure of coolant at the front and rear ends of the valve acts as a resistance, thereby applying an excessive load to the valve stem. That is, in the present invention, when the PID control is performed, since 5000 RPM or more and the ITM opening time can meet, when the RPM is 3000 RPM or more, the ITM opening degree is controlled to be opened in advance by a certain amount or more.

The reason why the integrated flow control valve control logic is configured based on the pedal and the RPM according to an example of the present invention is that the RPM does not increase linearly with the increase of the pedal value. In this case, the RPM is determined by the pedal value and the shift pattern, and the present invention will be described by adding the RPM logic thereto.

Table 2 below shows the angle value of the integrated flow control valve by the pedal value. As a result of confirming the change of the ITM opening angle according to the pedal value, a graph as shown in FIG. 4 is confirmed. 4 is a graph showing the change in the angle of the integrated flow control valve according to the pedal value according to the present invention. It may be described in detail as in FIG. 4 .

closing price 70.020 IMT angle 165.00

This is because it is predicted that the RPM will rise sharply when the driver steps on the pedal more than a preset threshold (70%), so that the ITM is controlled to move to a full change angle in advance. Accordingly, the engine control device of the vehicle controls the valve stem to prevent excessive load in advance. As described, the present invention provides a shortening of the timing of changing the target angle of the ITM by the pedal value and the shortening of the timing of changing the target angle of the ITM by the RPM, so that an excessive load acts on the valve stem of the integrated flow control valve. It provides the advantage of securing durability by preventing it from happening in advance. That is, the present invention has the effect of inducing the differential pressure to a minimum by controlling the valve to be opened first.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (15)

an integrated flow control valve in which opening degrees of a plurality of valves are adjusted by rotation of a cam; and
It is determined whether the opening control of the radiator valve is required among the plurality of valves according to the state of the integrated flow control valve, and when the opening control of the radiator valve is required, the accelerator pedal depression amount and the engine revolution per minute (RPM) are used to include a control unit for controlling the opening degree of the radiator valve,
The control unit is
It is checked whether the accelerator pedal depression amount exceeds a preset threshold value, and when it is confirmed that the accelerator pedal depression amount exceeds the preset threshold value, it is predicted that the engine RPM will rise sharply, and the radiator valve is fully opened and when it is determined that the accelerator pedal depression amount is less than or equal to the preset threshold value, it is checked whether the RPM exceeds a preset first threshold value, and when it is confirmed that the RPM exceeds the first threshold value, the radiator valve is controlled to open by a preset first angle,
Checking whether the RPM exceeds a second threshold greater than a preset first threshold, and confirming that the RPM exceeds the second threshold, the radiator valve is greater than a preset first angle and greater than the pull-open The engine control device, characterized in that it controls to be opened by a small second angle.
delete delete delete The method according to claim 1,
the control unit
and checking the coolant temperature of the integrated flow control valve, and when the coolant temperature is higher than a predetermined threshold value, it is determined that opening control of the radiator valve is necessary.
The method according to claim 1,
the control unit
and controlling the opening degree so that each of the plurality of valves has different opening angles.
The method according to claim 1,
the control unit
The engine control device according to claim 1, wherein the flow rate of the coolant is controlled by adjusting the rotation angle of the cam of each of the plurality of valves.
checking the state of the integrated flow control valve in which the opening degrees of the plurality of valves are adjusted by rotation of the cam;
determining whether opening control of a radiator valve among the plurality of valves is required according to the state of the integrated flow control valve;
checking an accelerator pedal depression amount and engine revolution per minute (RPM) when an opening control of the radiator valve is required; and
and controlling the amount of opening of the radiator valve using the depression amount of the accelerator pedal and the engine RPM.
The step of controlling the opening degree of the radiator valve,
checking whether the accelerator pedal depression amount exceeds a preset threshold value; and
predicting an abrupt increase in engine RPM when it is confirmed that the accelerator pedal depression amount exceeds the set threshold value and controlling the radiator valve to operate fully open;
When the accelerator pedal depression amount is less than or equal to the preset threshold value, it is checked whether the RPM exceeds a preset first threshold value, and when it is confirmed that the RPM exceeds the first threshold value, the radiator valve is set to a preset first threshold value. controlling it to be opened by an angle; and
Checking whether the RPM exceeds a second threshold greater than a preset first threshold, and confirming that the RPM exceeds the second threshold, the radiator valve is greater than the first angle and smaller than the pull-open An engine control method comprising the step of controlling to be opened by a second angle.
delete delete delete 9. The method of claim 8,
The step of checking the state of the integrated flow control valve,
Engine control method comprising the step of checking the coolant temperature of the integrated flow control valve.
13. The method of claim 12,
The step of determining whether the opening control of the radiator valve is necessary,
determining that opening control of the radiator valve is necessary when the coolant temperature is greater than a predetermined threshold value
Engine control method comprising a.
9. The method of claim 8,
The engine control method of claim 1, further comprising: controlling an opening amount of each of the plurality of valves so that each of the plurality of valves has a different opening angle.
15. The method of claim 14,
The step of controlling each opening degree is
and controlling a flow rate of the coolant by adjusting a rotation angle of a cam of each of the plurality of valves.

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