JP6582831B2 - Cooling control device - Google Patents

Description

  The present invention relates to a cooling control device that performs temperature management of an internal combustion engine via a coolant.

  As the above cooling control device, Patent Document 1 describes a technique including a flow control valve that controls the flow rate of cooling water that passes through a radiator, and an electronic control device that controls the flow control valve.

  In this patent document 1, the electronic control unit controls the opening degree of the flow rate adjustment valve so that the engine outlet water temperature becomes a required target temperature, and the basic as a feedforward term based on the operating state of the engine. The opening is set. In addition, the final opening is calculated from the F / B constant as a feedback term that is increased or decreased so that the engine outlet water temperature becomes the target temperature and the basic opening, and the flow rate adjustment valve is opened based on the final opening. Feedback control the degree.

Japanese Patent Laid-Open No. 2003-172141

  In Patent Document 1, the basic opening degree of the feedforward term is calculated from the operating conditions such as the heater requirement and the engine air-fuel ratio and the target water temperature calculated from the operating conditions.

  However, in a device that connects the engine and the radiator with a flow path composed of a hose and circulates with a water pump, there is variation in water resistance due to individual differences in the cooling circuit, and the opening of the flow control valve is Even when set appropriately, the amount of water may be excessive or insufficient. Also, there are individual differences in the opening sensor that detects the opening of the flow control valve that controls the coolant, and the flow rate is appropriate even if the opening of the flow control valve is set based on the detection result of this opening sensor. In some cases, it could not be set.

  In addition, when the water pump is driven by the engine and the flow resistance varies, the flow control valve manufacturing variation, and the sensor variation, the flow control valve adjusts the flow rate in response to fluctuations in the engine speed. However, it has been imagined that excessive cooling water is supplied to the flow path and that the amount of cooling water supplied to the flow path is insufficient.

  That is, there is a need for a cooling control device that realizes highly accurate temperature management by appropriately controlling the flow rate of the coolant that performs temperature management of the internal combustion engine.

The present invention includes a coolant pump driven by a driving force of an output shaft of an internal combustion engine, a heat exchanger to which the coolant of the internal combustion engine is supplied by the coolant pump, and a cooling supplied to the heat exchanger. A flow rate control valve for controlling the flow rate of the liquid,
A rotation speed acquisition unit that acquires the rotation speed of the output shaft, an opening sensor that detects the opening of the flow control valve, and a control unit that controls the opening of the flow control valve;
The control unit is an opening setting data in which the rotation speed of the output shaft and the target opening of the flow control valve are associated with each other in order to maintain the flow rate of the coolant supplied via the flow control valve at a target amount. And an opening setting unit that sets the target opening with reference to the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit ,
An opening correction unit that corrects the target opening set by the opening setting unit, and a correction data unit that stores correction data to be given to the opening correction unit,
The correction data portion is detected temperature change data detected within a set time by a liquid temperature sensor that detects the liquid temperature of the cooling liquid when the flow rate control valve is opened from the closed state and the supply of the cooling liquid is started. If the temperature difference between the reference temperature change data stored in advance and the reference temperature change data exceeds the first threshold value, the flow rate is increased, and the correction data value for reducing the flow rate is acquired. Is less than the second threshold value, the flow rate is reduced, and therefore the correction data value for increasing the flow rate is acquired .

In order to control the temperature of the internal combustion engine, for example, when control of supplying a coolant at a target flow rate to the radiator is considered, in the configuration in which the coolant pump is driven by the internal combustion engine, the change in the rotational speed of the internal combustion engine is accompanied. Since the flow rate also changes, it is necessary to control the opening degree of the flow control valve when the rotational speed of the internal combustion engine changes. On the other hand, with the configuration having the opening setting data as in this configuration, when the rotation speed of the internal combustion engine changes, the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit. The target opening is set with reference to the above, and control can be performed so that the opening detected by the opening sensor matches the target opening. The coolant supplied from the coolant pump can be controlled by the flow rate control valve, and the required amount of coolant can be supplied to the heat exchanger.
Especially when there are variations in flow resistance due to individual differences in the flow paths of the cooling control devices, such as when manufacturing multiple cooling control devices, or when there are individual differences in the opening sensor. Reflecting in the degree setting data makes it possible to control the coolant with high accuracy.
Therefore, a cooling control device has been constructed that realizes highly accurate temperature management by appropriately controlling the flow rate of the coolant that performs temperature management of the internal combustion engine.
Further, according to this feature, for example, when the flow control valve in the closed state is opened and supply of a certain amount of coolant is started, the amount corresponding to the flow resistance of the flow path of the heat exchanger per unit time As the coolant flows, the temperature detected by the liquid temperature sensor also changes with the determined characteristics. That is, the temperature change detected by the liquid temperature sensor when the coolant in the flow channel flows reflects the flow rate in the flow channel.
By utilizing this phenomenon, in this configuration, when the supply of the coolant to the flow path is started, the detected temperature change data detected by the liquid temperature sensor within the set time and the reference temperature change stored in advance A temperature difference from the data is obtained, and when the temperature difference exceeds the first threshold value, the flow rate is increased, and the value of correction data for reducing the flow rate is acquired. Further, when the temperature difference is less than the second threshold value, since the flow rate is small, the correction data value for increasing the flow rate is acquired. In this way, the value of the correction data can be acquired without using a flow sensor or a pressure sensor, and an appropriate target opening reflecting the channel resistance by correcting the target opening acquired from the opening setting data with the correction data. Can be obtained.

The present invention includes a coolant pump driven by a driving force of an output shaft of an internal combustion engine, a heat exchanger to which the coolant of the internal combustion engine is supplied by the coolant pump, and a cooling supplied to the heat exchanger. A flow rate control valve for controlling the flow rate of the liquid,
A rotation speed acquisition unit that acquires the rotation speed of the output shaft, an opening sensor that detects the opening of the flow control valve, and a control unit that controls the opening of the flow control valve;
  The control unit is an opening setting data in which the rotation speed of the output shaft and the target opening of the flow control valve are associated with each other in order to maintain the flow rate of the coolant supplied via the flow control valve at a target amount. And an opening setting unit that sets the target opening with reference to the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit,
An opening correction unit that corrects the target opening set by the opening setting unit, and a correction data unit that stores correction data to be given to the opening correction unit,
The correction data portion is detected temperature change data detected within a set time by a liquid temperature sensor that detects the liquid temperature of the cooling liquid when the flow rate control valve is opened from the closed state and the supply of the cooling liquid is started. And the reference temperature change data stored in advance, and if this temperature difference exceeds the first threshold value, the flow rate is reduced and the value of the correction data for increasing the flow rate is set. When the temperature difference is less than the second threshold value, the correction data value for reducing the flow rate is acquired because the flow rate is large.

In order to control the temperature of the internal combustion engine, for example, when control of supplying a coolant at a target flow rate to the radiator is considered, in the configuration in which the coolant pump is driven by the internal combustion engine, the change in the rotational speed of the internal combustion engine is accompanied. Since the flow rate also changes, it is necessary to control the opening degree of the flow control valve when the rotational speed of the internal combustion engine changes. On the other hand, with the configuration having the opening setting data as in this configuration, when the rotation speed of the internal combustion engine changes, the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit. The target opening is set with reference to the above, and control can be performed so that the opening detected by the opening sensor matches the target opening. The coolant supplied from the coolant pump can be controlled by the flow rate control valve, and the required amount of coolant can be supplied to the heat exchanger.
Especially when there are variations in flow resistance due to individual differences in the flow paths of the cooling control devices, such as when manufacturing multiple cooling control devices, or when there are individual differences in the opening sensor. Reflecting in the degree setting data makes it possible to control the coolant with high accuracy.
Therefore, a cooling control device has been constructed that realizes highly accurate temperature management by appropriately controlling the flow rate of the coolant that performs temperature management of the internal combustion engine.
Further, according to this feature, for example, when the flow control valve in the closed state is opened and supply of a certain amount of coolant is started, the amount corresponding to the flow resistance of the flow path of the heat exchanger per unit time As the coolant flows, the temperature detected by the liquid temperature sensor also changes with the determined characteristics. That is, the temperature change detected by the liquid temperature sensor when the coolant in the flow channel flows reflects the flow rate in the flow channel.
By utilizing this phenomenon, in this configuration, when the supply of the coolant to the flow path is started, the detected temperature change data detected by the liquid temperature sensor within the set time and the reference temperature change stored in advance A temperature difference from the data is obtained, and when the temperature difference exceeds the first threshold, the flow rate is reduced, and the value of correction data for increasing the flow rate is acquired. Further, when the temperature difference is less than the second threshold value, the flow rate is increased, and therefore the correction data value for reducing the flow rate is acquired. In this way, the value of the correction data can be acquired without using a flow sensor or a pressure sensor, and an appropriate target opening reflecting the channel resistance by correcting the target opening acquired from the opening setting data with the correction data. Can be obtained.

In the present invention, the internal combustion engine transmits a driving force to a transmission for traveling of a vehicle.
The rotational speed acquisition unit predicts an increase or decrease in the rotational speed of the output shaft before the rotational speed of the output shaft of the internal combustion engine changes based on a shift at the time of shifting in the transmission;
The opening degree setting unit may set the target opening degree from the opening degree setting data based on the increase / decrease in the rotation number predicted by the rotation number acquisition unit.

In the control for adjusting the opening degree of the flow control valve, a predetermined time is required until the opening degree actually reaches the target opening degree from the start of the control. Therefore, when the rotational speed of the internal combustion engine increases, for example, when the increase in the rotational speed is detected by a sensor (rotational speed acquisition unit) and the opening degree of the flow control valve is controlled based on the detection result, After the flow rate of the coolant supplied from the delay increases, a phenomenon that the opening degree of the flow rate control valve reaches an appropriate value is caused.
On the other hand, in the case of predicting increase / decrease in the rotational speed of the output shaft based on the shift signal at the time of shifting as in this configuration, the opening correction unit predicts the rotation before the rotational speed of the internal combustion engine changes. The opening of the flow control valve can be corrected by referring to the target opening from the opening setting data based on the number. Since such control can be performed, the flow rate of the coolant can be appropriately maintained in response to a change in the rotational speed of the internal combustion engine without causing a control delay.

  In the present invention, the heat exchanger may be a radiator.

  According to this, even when the coolant is supplied to the radiator, highly accurate flow control is realized by setting the opening of the flow control valve based on the opening setting data.

In the present invention, the flow rate control valve includes a valve housing having a housing hole, and a valve body that is movably accommodated in the valve housing and has a valve hole,
By setting the opening shape of one of the housing hole and the valve hole, when the flow control valve is operated in the opening direction from the closed position, the amount of coolant supplied relative to the amount of movement of the valve body A detection area where the increase rate is smaller than a preset value and a control area where the increase rate is larger than the detection area are set,
The correction data setting unit that sets the correction data in the correction data unit may acquire the value of the correction data from the flow rate difference when the coolant is supplied from the detection region.

  According to this, when the valve body of the flow control valve is operated in the opening direction from the closed position, the detected temperature change is based on the change in the flow rate of the coolant flowing in the detection region where the increase rate of the coolant is smaller than the control region. Can be obtained. For this reason, it is possible to suppress the rapid increase of the coolant and to increase the accuracy of the correction data set by the correction data setting unit in a state where it is difficult to be influenced by the cooling water heated by the internal combustion engine.

It is a figure which shows the structure of a cooling control apparatus. It is a chart which shows the opening degree of each valve part with respect to the operation amount of a valve body. It is a block circuit diagram of a control unit. It is a flowchart of a cooling control routine. It is a flowchart of a data correction processing routine. It is a flowchart of an opening correction process routine. It is a graph which shows the temperature change of the cooling water supplied to the EGR cooler. It is a graph which shows the temperature change of the cooling water supplied to the radiator. It is an expanded view which shows the housing hole part and valve hole part in a separation state. It is an expanded view which shows the housing hole part and valve hole part in a detection area. It is an expanded view which shows the housing hole part and valve hole part in a control area. It is a graph which shows the flow volume difference of the cooling water of the flow control valve in which the detection area was formed, and the flow control valve in which the detection area was not formed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 1, a water pump WP (an example of a cooling liquid pump) that sends cooling water (an example of a cooling liquid) of an engine E as an internal combustion engine, and a plurality of flow paths F (first flow) formed in parallel. The flow rate for controlling the flow of the cooling water (an example of the cooling liquid), the heat exchanger provided in each of the plurality of flow paths F, and the superordinate concept of the path F1, the second flow path F2, and the third flow path F3). The cooling control device is configured to include a cooling circuit including the control valve V and a control unit 10 (an example of a control unit) that sets the opening degree of the flow control valve V.

  This cooling control device detects the water temperature of the cooling water (cooling liquid) with a water temperature sensor S (an example of a liquid temperature sensor), and the control unit 10 controls the flow rate control valve V based on the detection result to exchange heat. Heat exchange in the vessel is managed.

  As a heat exchanger, the EGR cooler 1, the oil cooler 2, and the radiator 3 which are mentioned later are provided in the corresponding flow path F. Further, the water pump WP is arranged in a return flow path FR (a part of the flow path F) between the flow control valve V and the engine E.

  The cooling control device is configured to perform temperature management of an engine E (internal combustion engine) of a vehicle such as a passenger car. The engine E has a water jacket formed in a region extending from the cylinder block to the cylinder head. The cooling control device is configured to send the cooling water in the water jacket to the flow path F, supply the cooling water to the heat exchanger to exchange heat, and then return the water jacket to the water jacket by the water pump WP. The engine E is configured to transmit a driving force from a crankshaft as an output shaft to the transmission. The engine E can be used not only for reciprocating engines but also for internal combustion engines in general. Further, the engine E is not limited to the configuration in which the driving force is directly applied to the transmission, but may be one that transmits the driving force to the electric motor, for example, like a hybrid vehicle.

[Flow path / Heat exchanger]
The water temperature sensor S is provided in the engine E, and a plurality of flow paths F branched from the main flow path FM through which cooling water is sent from the engine E are formed. As the plurality of flow paths F, a first flow path F1, a second flow path F2, and a third flow path F3 are formed. As a heat exchanger, the EGR cooler 1 is provided in the first flow path F1, the oil cooler 2 is provided in the second flow path F2, and the radiator 3 is provided in the third flow path.

  Technology that improves exhaust gas components and improves fuel efficiency by taking out part of the exhaust gas from the engine E and returning it to the intake system is called EGR (Exhaust Gas Recirculation). Part of the exhaust gas taken out from the chamber is heat exchanged (cooled) with cooling water.

  The oil cooler 2 has a configuration in which the lubricating oil stored in the oil pan 5 of the engine E is supplied by the oil pump 6, and performs heat exchange with the cooling water. The lubricating oil that has been subjected to heat exchange in the oil cooler 2 is supplied to hydraulic operating devices such as a valve opening / closing timing control device or lubricating portions of various parts of the engine. The oil pump 6 is a variable hydraulic mechanical oil pump capable of controlling the hydraulic pressure level in two or more stages, and is driven by the engine E.

  The radiator 3 has a function of managing the temperature of the engine E by radiating the cooling water, and the cooling air is supplied from the radiator fan 7. The radiator fan 7 is driven by a fan motor 7M configured by an electric motor.

(Flow control valve)
The flow control valve V is configured as a rotary operation type in which a valve body is rotatably accommodated in a valve case. In addition, a valve motor VM configured by an electric motor so as to rotate the valve body, and a valve sensor VS (an example of an opening sensor) that detects the rotation angle of the valve body are provided. The flow control valve V may be a slide operation type in which a valve body that slides is accommodated inside the valve case.

  The flow control valve V includes a first valve portion V1 that opens and closes the first flow path F1, a second valve portion V2 that opens and closes the second flow path F2, and a third valve portion V3 that opens and closes the third flow path F3. have. FIG. 2 shows the opening degrees of the first valve portion V1, the second valve portion V2, and the third valve portion V3 with respect to the operation amount of the valve body in the flow rate control valve V having this configuration. The first valve portion V1, the second valve portion V2, and the third valve portion V3 are collectively referred to as valve portions.

  In FIG. 2, the vertical axis indicates the opening degree of the first valve part V1, the second valve part V2, and the third valve part V3 (the opening degree is expressed as a percentage), and the horizontal axis indicates the valve operating amount. (Rotation amount) is shown. As can be understood from the figure, when the valve body is in the initial position, the first valve portion V1, the second valve portion V2, and the third valve portion V3 are in the fully closed mode M0 in which they are closed, Cooling water does not flow through the first flow path F1, the second flow path F2, and the third flow path F3.

  Next, the opening degree of the first valve portion V1 is adjusted while the second valve portion V2 and the third valve portion V3 are maintained in the closed state by operating the valve body in the opening direction from the fully closed mode M0. Shifts to the first supply mode M1 in which

  Further, by operating the valve body in the opening direction beyond the fully opened state from the first supply mode M1, the opening degree of the first valve unit V1 is maintained in the fully opened state (the third valve unit V3 is in the closed state). Maintained), the operation proceeds to the second supply mode M2 in which the opening degree of the second valve portion V2 can be adjusted.

  And the state which maintained the opening degree of the 1st valve part V1 and the opening degree of the 2nd valve part V2 part by operating a valve body from the 2nd supply mode M2 to an open direction exceeding a fully open state Thus, the operation proceeds to the third supply mode M3 in which the opening degree of the third valve portion V3 can be adjusted.

  In particular, in this flow control valve V, the cooling water is not supplied by the second valve portion V2 before the opening degree of the first valve portion V1 reaches full open. Similarly, the cooling water is not supplied by the third valve portion V3 before the opening degree of the second valve portion V2 reaches the fully open position. The flow control valve V is not limited to this configuration. For example, the flow control valve V may be provided with four or more valve parts, or may be operated to be opened simultaneously in association with the opening degrees of a plurality of valve parts.

〔Controller unit〕
The control unit 10 manages the entire engine, and also manages the amount of heat exchanged by the heat exchanger by controlling the amount of cooling water flowing through the flow path F with the flow rate control valve V when the engine E is in operation. In particular, when temperature management of the engine E is performed, the flow rate of the cooling water supplied to the radiator 3 can be set optimally by the control of the flow rate control valve V.

  In this control unit 10, a temperature management control unit 12 described later sets a target flow rate for bringing the water temperature detected by the water temperature sensor S close to the target water temperature, and the engine speed E ( The target opening degree of the flow control valve V is set corresponding to the number of revolutions per unit time.

  By such temperature management control, when the rotational speed of the engine E changes, the opening amount of the flow rate control valve V is adjusted to supply the target flow rate of cooling water to the flow path F so that the engine E has an appropriate temperature. The temperature management control to maintain is realized.

  However, since the target opening is set on the assumption that the flow resistance of the flow path F is at the design value, if the flow resistance is different from the design value, it corresponds to a change in the rotational speed of the engine E. Even if the opening degree of the flow rate control valve V is adjusted, the flow rate of the cooling water supplied to the flow path F is not appropriate, which leads to inconvenience of lowering the accuracy of temperature management.

  A flowchart of FIG. 4 shows an outline of a control mode in which the flow resistance of the flow path F is reflected in the temperature management control so that such inconvenience can be solved.

  As shown in FIG. 3, the control unit 10 receives signals from a water temperature sensor S (liquid temperature sensor), a rotation speed sensor 21, a valve sensor VS (opening sensor), and a shift sensor 24. The control unit 10 also outputs control signals to a valve motor VM that controls the opening degree of the flow control valve V and a fan motor 7M that drives the radiator fan 7.

  The water temperature sensor S is provided in the engine so as to detect the water temperature of the cooling water, and is composed of a thermistor or the like. The rotation speed sensor 21 is composed of a non-contact type sensor that measures the rotation speed of the crankshaft of the engine E. From the detection of the rotation speed sensor 21, the rotation speed of the crankshaft (the rotation speed per unit time) can be detected. To.

  The valve sensor VS includes a Hall IC, a potentiometer, and the like, and detects the rotation angle of the valve body of the flow control valve V. This detection enables the flow rate control valve V to detect the opening of the valve portion in each supply mode. When shift control is performed, the shift sensor 24 outputs the position of the gear shift stage before the shift is completed. The shift sensor 24 is assumed to be hardware such as a switch that detects the position of a shifter or the like that is operated during a shift operation, but may be configured by software that acquires target shift speed data.

  The control unit 10 includes a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), and the like. Moreover, in this control unit 10, the warm-up control part 11 comprised as software, the temperature management control part 12, the opening degree setting part 13, the rotation speed acquisition part 14, the opening degree setting data part 15, An opening correction unit 16, a correction data unit 17, and a correction data setting unit 18 are provided.

  Based on the detection result of the water temperature sensor S, the temperature management control unit 12 selects any one of the first supply mode M1, the second supply mode M2, and the third supply mode M3. In the first supply mode M1 and the second supply mode M2, the opening degrees of the first valve unit V1 and the second valve unit V2 are set based on the detection result of the water temperature sensor S, and the EGR cooler 1 and the oil cooler 2 Control for managing the amount of cooling water supplied to the is performed.

  Further, the temperature management control unit 12 sets a target flow rate of the cooling water supplied to the radiator 3 by the third flow path F3, sets a target opening degree of the flow rate control valve V based on the rotational speed of the engine E, Control for driving the valve motor VM is performed so as to obtain the target opening. In the third supply mode M3, when the vehicle is traveling at a low speed and the water temperature is high, the fan motor 7M is driven to drive the radiator fan 7 and supply the cooling air to the radiator 3. Further, the fan motor 7M is not driven during high speed traveling.

  In the control by the temperature management control unit 12, the temperature management control unit 12 gives the target flow rate to the opening setting unit 13. Next, the opening setting unit 13 refers to the target opening data from the opening setting data unit 15 based on the rotation speed acquired by the rotation speed acquisition unit 14. The rotation speed acquisition unit 14 directly acquires the value of the rotation speed of the output shaft of the engine E, or acquires the rotation speed of the output shaft of the engine E that appears after a shift shift operation.

  The target opening set by the opening setting unit 13 is given to the opening correction unit 16. The opening correction unit 16 corrects and outputs the target opening based on the correction data given from the correction data unit 17.

  The correction data setting unit 18 sets correction data for the correction data unit 17. The correction data unit 17 is data set to correct the excess or deficiency of the flow rate caused by the flow path resistance of the flow path F. The correction data can be acquired by using, for example, a flow sensor or a pressure sensor, but is set by a data correction process in step # 100 described later. If correction data exists before this setting, it is set to be updated by overwriting. These control modes will be described together with the description of the flowchart.

[Control form]
As shown in the flowchart of FIG. 4, in the cooling control routine for managing the temperature of the engine E, when the water temperature detected by the water temperature sensor S is less than the reference value, just after the engine E is started, the engine is warmed up. The control unit 11 maintains the flow rate control valve V in the fully closed mode M0 (closes all the valve units) and executes a warm-up operation to stop the circulation of the cooling water (# 01 to # 03 steps).

  Next, when the water temperature detected by the water temperature sensor S rises above the reference value, a temperature management operation is performed by the temperature management control unit 12 (# 04 step). In this temperature management operation (step # 04), any one of the first supply mode M1, the second supply mode M2, and the third supply mode M3 is set based on the detection result of the water temperature sensor S. . In these supply modes, control for setting at least one of the first valve portion V1, the second valve portion V2, and the third valve portion V3 to the target opening degree is performed.

  In particular, as an example of temperature management control, an outline of feedforward control executed in a state where the flow control valve V is set to the third supply mode M3 will be described below. In this control, the total amount of heat contained in the cooling water is obtained by calculating the amount of heat for heating the cooling water by the engine E, the EGR cooler 1 and the like and the amount of heat radiated from the cooling water mainly by the radiator 3. This total amount of heat is the amount of heat stored in the cooling water, and is calculated as the amount of heat released from the remaining amount of heat obtained by subtracting the amount of heat required to maintain the engine E at an appropriate temperature from this total amount of heat. In order to dissipate this amount of heat, a target flow rate of cooling water to be supplied to the third flow path F3 per unit time is set by referring to a preset arithmetic expression or table, and this target In order to obtain a flow rate, a target opening set in the flow control valve V is set.

  The target opening is set to a larger opening as the amount of heat to be dissipated is larger. However, in order to maintain the flow rate of the cooling water even when the engine E varies, the target opening is , Based on the rotational speed of the engine E. The opening setting data unit 15 described above stores a plurality of opening setting data corresponding to the target flow rate. As the opening setting data, the target flow rate corresponding to the target flow rate is selected. The opening degree setting data has a data structure in which the rotation speed acquired by the rotation speed acquisition unit 14 is associated with the target opening degree. For example, the horizontal axis indicates the rotation speed and the vertical axis indicates the target opening degree. A map-type data structure can be considered.

  When the rotational speed of the engine E changes except when the first supply mode M1 is set for the first time, the opening setting unit 13 refers to the target opening data in the opening setting data unit 15. A target opening is set (# 05, # 200 steps).

  The target opening set in this way is corrected by the opening correction unit 16, and the corrected target opening and the value detected by the valve sensor VS coincide with the valve motor VM. Is driven, it becomes possible to supply cooling water with a target flow rate to the flow path F. The case where the first supply mode M1 is set for the first time refers to the case where the cooling water is first supplied in the first supply mode M1 after the engine E is started.

  When the first supply mode M1 is set for the first time, data correction processing is executed (# 05, # 100 steps).

  The opening correction processing routine (step # 200) will be described before step # 100. This opening correction processing routine is set as a subroutine. As shown in FIG. 6, opening setting data of the opening setting data unit 15 is set corresponding to the target opening, and is detected by the rotation speed sensor 21. Get the number of rotations to be performed. The rotational speed acquired in this way is the predicted rotational speed of the output shaft of the engine E when there is a shift operation, and the rotational speed detected by the rotational speed sensor 21 when there is no shift operation. (Steps # 201 to # 205).

  For example, in a transmission in which a shift is performed by an automatic shift operation of the transmission based on a load acting on the traveling system, the rotation speed of the engine E increases after a shift by an automatic shift operation when traveling on an uphill road There are things to do. In step # 204, when the shift operation is started, the rotational speed of the output shaft of the engine E after the shift is estimated, and when there is no shift operation, the actual rotational speed is acquired. Further, the rotational speed may be estimated even when the rotational speed of the engine E decreases due to the shift operation.

  Next, from the set opening setting data, the target opening is referred to based on the rotational speed, and the target opening thus referred is given to the opening correction unit 16, and in the opening correction unit 16, Correction is performed based on either correction data corresponding to the EGR cooler 1 set in the correction data unit 17 or correction data corresponding to the radiator 3. The opening degree of the flow control valve V is driven to the target opening degree by the valve motor VM so as to reach the corrected target opening degree (steps # 206 to # 208).

  The correction data unit 17 includes a nonvolatile memory that stores correction data corresponding to the flow path resistance of the flow path F. For example, when the correction data is set as a coefficient, “1” is set if the flow path resistance matches the designed value, and “1” is set if the flow resistance is larger than the designed value. A large value is given, and if it is small, a value less than “1” is given. Therefore, the opening degree correction unit 16 sets the target opening degree by a calculation that simply corrects the target opening degree.

  As a result, it becomes possible to supply cooling water with an amount of water reflecting the flow path resistance to the third flow path F3, thereby preventing excessive cooling or overheating due to insufficient cooling.

  The correction processing routine (step # 100) is set as a subroutine, and as shown in the flowchart of FIG. 5, the temperature change measured by the water temperature sensor S at the set time T is acquired and compared with the reference temperature change. (Steps # 101 and # 102).

  That is, when the first valve portion V1 is opened and the cooling water is supplied to the first flow path F1 for the first time, the cooling water having a flow rate equal to the value designed for the first flow path F1 flows. In this case, the temperature changes along the graph of the reference temperature change data Qx in FIG. Further, when cooling water having a flow rate equal to the value designed for the third flow path F3 flows, the temperature changes along the graph of the reference temperature change data Qx in FIG.

  According to the experiment, when the supply of cooling water to the EGR cooler 1 is started by the first flow path F1, the flow temperature resistance is larger than the designed one, and the water temperature sensor is suppressed when the flow of the cooling water is suppressed. The temperature detected at S is lower than the reference temperature change data Qx. On the contrary, when the flow resistance is smaller than that set, and the flow of cooling water increases, the temperature detected by the water temperature sensor S rises from the reference temperature change data Qx.

  Similarly, when the supply of cooling water to the radiator 3 is started by the third flow path F3 by experiment, the flow resistance is larger than the designed one and the flow of cooling water is suppressed. The temperature detected by the water temperature sensor S rises from the reference temperature change data Qx. On the contrary, when the flow resistance is smaller than that set, and the flow of the cooling water increases, the temperature detected by the water temperature sensor S is lower than the reference temperature change data Qx. FIG. 8 shows only the low temperature side of the temperature detected by the water temperature sensor S (detected temperature change data Qs).

  For this reason, if the detected temperature exceeds the reference temperature change data Qx graph when the cooling water is passed through the EGR cooler 1, it can be determined that the flow rate is large, and the detected temperature shows the reference temperature change data Qx graph. When it falls below, it can be judged that the flow rate is small. On the contrary, if the detected temperature exceeds the graph of the reference temperature change data Qx when the cooling water is passed through the radiator 3, it can be determined that the flow rate is small, and the detected temperature is lower than the graph of the reference temperature change data Qx. In this case, it can be determined that the flow rate is large.

  When the detected temperature detected by the water temperature sensor S changes along the graph of detected temperature change data Qs different from the reference temperature change data Qx, the temperature difference at the set time T as shown in FIGS. The flow rate can be estimated based on G. When the flow rate is estimated, the detected temperature (the value of the predetermined timing in the graph of the detected temperature change data Qs) takes either the high temperature side or the low temperature side from the reference temperature change data Qx, so at a predetermined timing. The temperature difference G is acquired by subtracting the detected temperature change data Qs from the value of the reference temperature change data Qx.

  Next, when the detected temperature is the reference temperature change data Qx and the detected temperature change data Qs, the temperature difference G is acquired. If the heat exchanger is the EGR cooler 1, the temperature difference G, the first EGR cooler threshold value He and the first It is compared with the 2EGR cooler threshold value Le (steps # 103, # 104 and # 106). When the heat exchanger is the radiator 3n, the temperature difference G is compared with the first radiator threshold Hr and the second radiator threshold Lr (# 103, # 108, # 110 steps).

  In step # 103, if the target to which cooling water is supplied is the EGR cooler 1 and the acquired temperature difference G is larger than the first EGR cooler threshold value He, correction data for reducing the flow rate is set, and the temperature difference When G is smaller than the second EGR cooler threshold value Le, correction data for increasing the flow rate is set (steps # 104 to # 107).

  In step # 103, if the target to which cooling water is supplied is the radiator 3 and the acquired temperature difference G is larger than the first radiator threshold value Hr, correction data for increasing the flow rate is set, and the temperature difference G Is smaller than the second radiator threshold value Lr, correction data for reducing the flow rate is set (steps # 108 to # 111).

  A specific example of this process will be described. A first EGR cooler threshold value He is given a positive sign (for example, “+10”), and a second EGR cooler threshold value Le is given a negative sign (for example, “−10”). When the reference temperature change data Qx is 80 ° C. and the detected temperature change data Qs is 100 ° C., the temperature difference G is 20 (100−80 = 20), and the determination is G> He. When the reference temperature change data Qx is 80 ° C. and the detected temperature change data Qs is 60 ° C., the temperature difference G is −20 (60−80 = −20), and the determination is G <Le. Become.

  Specifically, when the cooling water is supplied to the first flow path F1 and the cooling water flows to the EGR cooler 1, if the temperature difference G is larger than the first EGR cooler threshold value He, the flow rate becomes larger than the design value. Therefore, the correction data value for reducing the flow rate is acquired. Further, when the temperature difference G is smaller than the second EGR cooler threshold value Le, the flow rate is smaller than the design value, so the value of correction data for increasing the flow rate is acquired. Further, in the case where the cooling water is supplied to the third flow path F3 and the cooling water flows to the radiator 3, when the temperature difference G is larger than the first radiator threshold value Hr, the flow rate is smaller than the design value. The value of the correction data that increases the value is acquired. Further, when the temperature difference G is smaller than the second radiator threshold value Lr, the flow rate is larger than the design value, so that the value of correction data for reducing the flow rate is acquired.

  Based on the value of the correction data acquired in this way, correction data corresponding to the EGR cooler 1 and correction data corresponding to the radiator 3 are set in the correction data unit 17. If the determined flow resistance matches the designed flow resistance, the correction data set in this way is given “1” as described above, and the determined flow resistance is designed. A value larger than “1” is given when the flow path resistance is larger, and a value smaller than “1” is given when smaller.

  In the first supply mode M1 for supplying cooling water to the EGR cooler 1, the third supply mode for supplying cooling water to the radiator 3, and M3, the target opening set by the opening setting unit 13 based on the corresponding correction data. The target opening is corrected by the calculation for correcting the degree. Thereby, the opening degree of the flow control valve V is set to an appropriate value corresponding to the flow path resistance, and the coolant with the target flow rate is supplied to realize highly accurate temperature management.

  Therefore, in any of the first supply mode M1 and the second supply mode M2, the required flow rate of cooling water is supplied to the corresponding flow path to realize highly accurate temperature management.

[Operation / Effect of Embodiment]
In the cooling control routine, even if the flow path resistance of the flow path F is different from the design value, the correction data is set, so that it is appropriate for the flow path F without changing the control routine in the temperature management control unit 12. It is possible to achieve highly accurate temperature control by supplying cooling water at a high flow rate. In particular, if the opening detected by the valve sensor VS includes an error, this error affects the flow rate supplied to the flow path F when controlling the flow rate. However, when the target opening is corrected by the opening correction unit 16, the value including this error is also corrected. As a result, it is possible to obtain an appropriate flow rate without exchanging the valve sensor VS or performing a process for correcting the detection result of the valve sensor VS.

  That is, even when the flow path resistance changes due to secular change, or when there is variation in the manufacture of the valve itself, it is possible to reflect the changed flow path resistance in the correction data, and the rotational speed of the engine E It is possible to supply an appropriate flow rate even when is changed.

  Further, in the data correction process (# 100 step), since it is possible to determine the flow path resistance based on the change in the water temperature detected by the water temperature sensor S and to set appropriate correction data, for example, a flow sensor is provided, Correction data can be set very easily without requiring a water pressure sensor or the like.

[Another embodiment]
In addition to the above-described embodiments, the present invention may be configured as follows (the components having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments).

(A) The opening setting data in the opening setting data unit 15 is corrected based on the correction data in the correction data unit 17. By correcting the opening setting data with the correction data in this way, it is possible to set an appropriate target opening only by referring to the control data with the rotation speed.

(B) In the embodiment, the correction data is updated by the correction data setting unit 18 when the cooling water is first supplied in the first supply mode M1. Instead, in at least one of the third supply mode M3 in which the supply of cooling water from the engine E is started to the radiator 3 and the second supply mode M2 in which the cooling water is supplied to the oil cooler 2, similarly. The processing mode is set so as to update the correction data.

  By configuring in this way, it becomes possible to supply the cooling water at a required flow rate to the flow path F to which the cooling water is supplied in the corresponding supply mode.

(C) A heater core to which cooling water of the flow path F is supplied is provided, and an on-off valve for supplying and shutting off the cooling water to the heater core is provided to constitute a cooling control device. In order to maintain the flow rate of the cooling water flowing in the flow path F, the control mode of the control unit is set so as to increase the opening degree of the flow rate control valve V.

  In this configuration, since a part of the cooling water is supplied to the heater core, the flow rate of the cooling water supplied to the flow path F other than the heater core is maintained even if the control for increasing the opening degree of the flow control valve V is performed. It will be. For this reason, the corresponding opening setting data in the opening setting data unit 15 is set.

(D) As described in the step # 100 in the embodiment, when the data correction process is executed by opening the first valve portion V1 of the flow rate control valve V, a diagram for increasing the detection accuracy of the detected temperature change data Qs. The flow control valve V is configured as shown in FIGS.

  That is, the housing hole 35a is formed in the valve housing 35 of the flow rate control valve V, and the valve hole 36a is formed in the valve body 36 accommodated therein to constitute the first valve portion V1. The housing hole 35a is formed with a detection area 35s formed of a long hole protruding in the relative movement direction of the housing hole 35a and the valve hole 36a, and a control area 35t formed of a main part of the housing hole 35a. The

  In the detection region 35s, the rate of increase of the cooling water supply amount relative to the relative movement amount (an example of the movement amount of the valve body) between the housing hole portion 35a and the valve hole portion 36a is set to a value smaller than a preset value. In the control region 35t, the increasing rate of the cooling water supply amount relative to the relative movement amount is set to a value larger than the increasing rate described above.

  With this configuration, as shown in FIG. 9, the first valve portion V1 is maintained in a closed state in a state where the housing hole portion 35a and the valve hole portion 36a are separated from each other. Next, as shown in FIG. 10, the valve body 36 moves relative to the valve housing 35 in the opening direction, and the coolant is supplied by the valve hole 36a overlapping the detection region 35s of the housing hole 35a. Be started. By further relative movement in the opening direction, it is possible to increase the cooling water supplied by overlapping the valve hole portion 36a with the control region 35t of the housing hole portion 35a.

  Here, the flow rate of the cooling water when the conventional configuration in which the simple circular hole portion of the valve housing 35 and the valve body 36 is formed and the improved configuration shown in FIGS. The change is shown in FIG. In the conventional configuration, the opening degree increases according to the conventional characteristic Da, and in the improved configuration, the opening degree increases according to the improved characteristic Db. As is apparent from these graphs, a rapid increase in the amount of cooling water at the initial opening of the valve portion is suppressed.

  By using this configuration, when cooling water is supplied to the first valve portion V1 for the first time, the rapid increase in the amount of cooling water is suppressed, and the detected temperature change data Qs is acquired with high accuracy. In addition, the accuracy of the correction data is improved.

(E) As the flow control valve V, for example, with the first valve portion V1, the second valve portion V2, and the third valve portion V3 of the embodiment, the opening degree of the first valve portion V1 reaches full open. The supply of cooling water may be started before by the second valve portion V2, and the supply of cooling water may be started by the third valve portion V3 before the opening degree of the second valve portion V2 reaches full open. . That is, when the flow control valve V is configured with a plurality of valve parts, the opening degree of the other valve part is increased before the opening degree of the predetermined valve part reaches 100% with the operation of the valve body. Moreover, you may comprise so that the expansion area | region of each opening degree may overlap.

(F) The cooling control device of this configuration can be used for all internal combustion engines. Further, in the cooling control device that includes the heater core and includes the heater valve that controls the supply and discharge of the cooling water with respect to the heater core, the opening degree of the flow control valve V in the state where the cooling water is supplied to the heater core and the state where the cooling water is not supplied. The control form may be set so as to switch the map-type data for setting.

  The present invention can be used in a cooling control device that performs temperature management of an internal combustion engine via a coolant.

1 Heat exchanger (EGR cooler)
2 Heat exchanger (oil cooler)
3 Heat Exchanger / Radiator 10 Control Unit 13 Opening Setting Unit 14 Rotational Speed Acquisition Unit 16 Target Opening Correction Unit 17 Correction Data Unit 35 Valve Housing 35a Housing Hole 36 Valve Body 36a Valve Hole E Internal Combustion Engine (Engine)
F channel G temperature difference He first threshold (first EGR cooler threshold)
Hr first threshold value (first radiator threshold value)
Le second threshold (second EGR cooler threshold)
Lr second threshold (second radiator threshold)
Qx Reference temperature change data Qs Detection temperature change data S Liquid temperature sensor (water temperature sensor)
V Flow control valve VS Opening sensor WP Coolant pump (water pump)

Claims (6)

A coolant pump driven by the driving force of the output shaft of the internal combustion engine, a heat exchanger to which the coolant of the internal combustion engine is supplied by the coolant pump, and a flow rate of the coolant supplied to the heat exchanger. A flow control valve for controlling,
A rotation speed acquisition unit that acquires the rotation speed of the output shaft, an opening sensor that detects the opening of the flow control valve, and a control unit that controls the opening of the flow control valve;
The control unit is an opening setting data in which the rotation speed of the output shaft and the target opening of the flow control valve are associated with each other in order to maintain the flow rate of the coolant supplied via the flow control valve at a target amount. And an opening setting unit that sets the target opening with reference to the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit ,
An opening correction unit that corrects the target opening set by the opening setting unit, and a correction data unit that stores correction data to be given to the opening correction unit,
The correction data portion is detected temperature change data detected within a set time by a liquid temperature sensor that detects the liquid temperature of the cooling liquid when the flow rate control valve is opened from the closed state and the supply of the cooling liquid is started. If the temperature difference between the reference temperature change data stored in advance and the reference temperature change data exceeds the first threshold value, the flow rate is increased, and the correction data value for reducing the flow rate is acquired. Is lower than the second threshold value, the cooling control device acquires the value of the correction data for increasing the flow rate because the flow rate has decreased . A coolant pump driven by the driving force of the output shaft of the internal combustion engine, a heat exchanger to which the coolant of the internal combustion engine is supplied by the coolant pump, and a flow rate of the coolant supplied to the heat exchanger. A flow control valve for controlling,
A rotation speed acquisition unit that acquires the rotation speed of the output shaft, an opening sensor that detects the opening of the flow control valve, and a control unit that controls the opening of the flow control valve;
The control unit is an opening setting data in which the rotation speed of the output shaft and the target opening of the flow control valve are associated with each other in order to maintain the flow rate of the coolant supplied via the flow control valve at a target amount. And an opening setting unit that sets the target opening with reference to the opening setting data based on the rotation speed acquired by the rotation speed acquisition unit,
An opening correction unit that corrects the target opening set by the opening setting unit, and a correction data unit that stores correction data to be given to the opening correction unit,
The correction data portion is detected temperature change data detected within a set time by a liquid temperature sensor that detects the liquid temperature of the cooling liquid when the flow rate control valve is opened from the closed state and the supply of the cooling liquid is started. And the reference temperature change data stored in advance, and if this temperature difference exceeds the first threshold value, the flow rate is reduced and the value of the correction data for increasing the flow rate is set. The cooling control device that acquires and corrects the value of the correction data for reducing the flow rate when the temperature difference is below the second threshold because the flow rate is large . The internal combustion engine transmits a driving force to a transmission for driving the vehicle;
The rotational speed acquisition unit predicts an increase or decrease in the rotational speed of the output shaft before the rotational speed of the output shaft of the internal combustion engine changes based on a shift at the time of shifting in the transmission;
The cooling control device according to claim 1 or 2 , wherein the opening degree setting unit sets the target opening degree from the opening degree setting data based on an increase or decrease in the rotation number predicted by the rotation number acquisition unit. The cooling control device according to any one of claims 1 to 3, wherein the heat exchanger is an EGR cooler. The cooling control device according to any one of claims 1 to 3, wherein the heat exchanger is a radiator. The flow rate control valve includes a valve housing having a housing hole, and a valve body that is movably accommodated in the valve housing and has a valve hole,
By setting the opening shape of one of the housing hole and the valve hole, when the flow control valve is operated in the opening direction from the closed position, the amount of coolant supplied relative to the amount of movement of the valve body A detection area where the increase rate is smaller than a preset value and a control area where the increase rate is larger than the detection area are set,
The cooling control according to claim 1 or 2 , wherein the correction data setting unit that sets the correction data of the correction data unit acquires a value of the correction data from a flow rate difference when cooling liquid is supplied from the detection region. apparatus.

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