JP5949176B2 - Control device for internal combustion engine - Google Patents

Description

  The present invention relates to a control device for an internal combustion engine, and more particularly to a control device that controls a device associated with the internal combustion engine based on the temperature of cooling water of the internal combustion engine.

  As a control device for an internal combustion engine configured as described above, Patent Document 1 includes a control system that performs EGR control and control by a variable valve operating device based on the temperature detected by a water temperature sensor that detects the temperature of cooling water. The configuration is shown. In this Patent Document 1, when the internal combustion engine is cooled by circulating the cooling water as after the warm-up, the water temperature sensor is detected until the temperature change detected by the water temperature sensor that detects the temperature of the cooling water converges. The control form which suppresses unnecessary control by stopping control of EGR control based on the detected temperature of this, a variable valve apparatus, etc. is described.

  In Patent Document 2, when cooling water is circulated after the warm-up is completed, the amount of cooling water supplied to the internal combustion engine is controlled by a flow control valve, thereby suppressing thermal fatigue caused by the cooling cycle. The structure to be described is described. Also in this patent document 2, since the amount of cooling water is suppressed, unnecessary control is suppressed as a result.

JP 2011-214565 A JP 2011-214466 A

  Assuming an engine provided in a vehicle such as a passenger car as an internal combustion engine, immediately after the engine is started, the engine is warmed up without increasing the temperature of the engine without sending the coolant to the radiator. After the temperature reaches the set value, the engine cooling water is sent to the radiator, and the control shifts to cooling the engine.

  In the configuration described in Patent Document 1, in order to suppress improper control immediately after the cooling water from the radiator is supplied to the engine, when the cooling water supply from the radiator is started, the cooling water The control state based on the water temperature at the timing when is supplied is maintained until the change in the cooling water temperature converges.

  As control performed based on the water temperature, fuel injection timing by an injector, throttle valve opening setting, ignition timing setting by an ignition plug, opening / closing timing setting of an intake valve or the like are known. ing.

  However, in the case of maintaining the control state as in the control described in Patent Document 1, for example, the temperature of the entire engine rises and is detected by the water temperature sensor as in the case where the engine shifts to high speed rotation. Even when the water temperature rises, control based on a fixed water temperature is maintained, so that the fuel injection timing by the injector and the valve opening / closing timing cannot be set appropriately, and there is room for improvement.

  Therefore, as described in Patent Document 2, it is conceivable to suppress the amount of cooling water supplied to the engine by a flow control valve. However, in the configuration including the flow control valve, not only the number of parts increases, The configuration is complicated, for example, a control device for appropriately setting the flow rate of the cooling water supplied from the radiator to the engine is required.

  An object of the present invention is to rationally configure a control device for an internal combustion engine that can properly control a device that determines the operating condition of the internal combustion engine even when the supply of cooling water from a radiator to the internal combustion engine is started. In the point.

A feature of the present invention includes a supply path for sending cooling water of the internal combustion engine to the radiator and a reduction path for returning the cooling water from the radiator to the internal combustion engine, and the temperature of the internal combustion engine rises without sending the cooling water to the radiator A warm-up mode in which the cooling water temperature is increased to a preset value in the warm-up mode, and the cooling water of the internal combustion engine is sent to the radiator through the supply path from the reduction path to the internal combustion engine. A water temperature control unit for switching to a cooling mode for returning to cooling and setting control information based on the detected temperature of the first water temperature sensor for detecting the temperature of the cooling water, and based on this control information An engine control unit that controls a device that determines an operating condition of the internal combustion engine, and is predicted when the water temperature control unit is switched from the warm-up mode to the cooling mode. Includes a correction processing unit for correcting the control information in response to a temperature change to the low temperature side of the cooling water is measured to a value to reduce the influence on the control of the device,
A second water temperature sensor for detecting a temperature of cooling water sent from the radiator to the internal combustion engine; and the correction processing unit detects a temperature detected by the first water temperature sensor and a detection by the second water temperature sensor in a warm-up mode. A temperature difference is predicted from the temperature, and when the predicted temperature difference exceeds the first threshold value, a correction coefficient for correcting the control information is set in advance,
When the temperature difference does not exceed the first threshold value, the correction processing unit detects a temperature detected by the first water temperature sensor immediately before switching from the warm-up mode to the cooling mode, and the first water temperature after switching. A correction coefficient for correcting the control information is set when the elapsed time after switching until the temperature difference based on the temperature detected by the sensor reaches a set value is shorter than the second threshold .

According to this configuration, when switching from the warm-up mode to the cooling mode, the correction processing unit determines the value of the control information corresponding to the temperature change to the low temperature side of the predicted or measured cooling water. To a value that reduces the effect on the control of
In other words, when the temperature of the cooling water supplied to the internal combustion engine decreases after switching from the warm-up mode to the cooling mode, it corresponds to the temperature change to the low temperature side that is predicted in advance or measured. Since the correction means corrects the control information, the control of the device is performed based on the corrected control information, so that the detected temperature of the first water temperature sensor is not reflected in the control as it is, and the internal combustion is performed in a state where the influence is reduced. Control in a form that reflects the operation of the engine is realized.
Accordingly, a control apparatus for an internal combustion engine is provided that can properly control a device that determines the operating condition of the internal combustion engine even when the supply of cooling water from the radiator to the internal combustion engine is started.
Further, according to this configuration, the temperature difference is predicted based on the detected temperature of the first water temperature sensor and the detected temperature of the second sensor, and the correction coefficient is calculated when the predicted temperature difference exceeds the first threshold value. Since it can be set, the control information can be quickly corrected based on the correction coefficient when the mode is switched from the warm-up mode to the cooling mode.
Further, even in a situation where the temperature of the cooling water does not greatly decrease as in the case where the temperature difference predicted from the temperature detected by the first water temperature sensor and the temperature detected by the second water temperature sensor does not exceed the first threshold, the cooling water When the elapsed time required for the water temperature to decrease by a set value is shorter than the second threshold, the degree of change is acquired based on the elapsed time, correction information is set, and control is performed based on the correction information. Information can be corrected.

  In the present invention, when the elapsed time is longer than the second threshold value, the correction processing unit detects a temperature detected by the first water temperature sensor immediately before switching from the warm-up mode to the cooling mode, and a set time after switching. A correction coefficient that corrects the control information may be set based on a temperature difference based on the temperature detected by the first water temperature sensor at the time when elapses.

  According to this, even in a situation where the coolant temperature gradually changes as in the case where the elapsed time until the temperature difference between the immediately before and after the mode switching reaches the set value is longer than the second threshold value. The correction information can be set by obtaining the temperature difference of the cooling water within the set time, and the control information can be corrected based on the correction information.

  In the present invention, a bypass path connecting the supply path and the reduction path is formed, and in the warm-up mode, cooling water of the internal combustion engine is returned from the bypass path to the internal combustion engine, and in the cooling mode, the internal combustion engine A switching valve for returning the cooling water from the supply path to the radiator and then returning the cooling water to the internal combustion engine; and the first water temperature sensor from the connection position where the bypass path is connected to the reduction path. You may provide in the position which detects the water temperature near the internal combustion engine.

  According to this, by providing the switching valve, in the warm-up mode, the cooling water of the internal combustion engine can be returned to the internal combustion engine by a bypass path to promote the warm-up, and in the cooling mode, the cooling water of the internal combustion engine is supplied to the radiator. Efficient cooling becomes possible. Further, since the first water temperature sensor is provided at a position closer to the internal combustion engine than the portion where the bypass path is connected in the reduction path, it is possible to detect the exact coolant temperature immediately before being supplied to the internal combustion engine. .

It is a figure which shows the outline | summary of an engine, and the structure of an engine control apparatus. It is a flowchart which shows the control form of an engine control apparatus. It is a flowchart which shows a device control routine. It is a flowchart which shows a correction coefficient setting routine. It is the figure which graphed the water temperature detected with a 1st water temperature sensor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
FIG. 1 shows an engine E as an internal combustion engine and an engine control device A that controls the engine. The engine control device A is an ECU that controls the operation of the engine E and controls the temperature of cooling water. Function.

  The engine E has a configuration in which a cylinder head 1, an engine body 2, and an oil pan 3 are overlapped and connected to each other, and a combustion chamber is provided between an upper portion of a cylinder bore of the engine body 2 and the cylinder head 1. (Not shown) is formed.

  Although a specific structure is not shown in the drawings, each combustion chamber is provided with an intake valve, an exhaust valve, and an ignition plug 5, and a cylinder head 1 that supplies air in the combustion chamber is provided with an injector 6. The upper part of the engine E is provided with an intake camshaft for opening and closing an intake valve and an exhaust camshaft for opening and closing an exhaust valve, and a valve opening / closing timing control device 7 for setting the intake timing by changing the rotation phase of the intake camshaft. At the top of the engine E.

  A rotation sensor 8S that detects a rotation phase and a rotation speed is provided in the vicinity of the crankshaft 8. The engine control device A corrects the control information based on the detected temperature of the first water temperature sensor S1, as described later, and based on the control information thus corrected and the timing information detected by the rotation sensor 8S, The spark plug 5, the injector 6, and the valve opening / closing timing control device 7 are controlled. In particular, the spark plug 5, the injector 6, and the valve opening / closing timing control device 7 are an example of a device that determines the operating condition of the engine E.

  With such a configuration, the intake valve is opened during intake operation and fuel is injected by the injector 6 to create an air-fuel mixture in the combustion chamber, and the intake valve is closed during compression operation. In step 5, the air-fuel mixture is ignited to perform expansion operation by combustion. The engine E is configured to operate in a general cycle in which the operating force of the piston in this expansion operation is transmitted to the crankshaft 8 and then the exhaust valve is opened to discharge the combustion gas.

〔Cooling system〕
The engine E includes a cooling device that cools the engine E by sending cooling water in a water jacket cooling path 2 </ b> A formed inside the engine body 2 to the radiator 11. This cooling device includes a supply path 12 that supplies cooling water in the cooling path 2A of the water jacket to the radiator 11, a reduction path 13 that returns the cooling water of the radiator 11 to the water jacket, and cooling water at an intermediate position of the supply path 12. And a bypass passage 14 for returning to the reduction passage 13. A switching valve 15 is provided at a connection portion between the supply path 12 and the bypass path 14, a water pump 16 is provided at an engine side end of the reduction path 13, and a radiator fan 17 is provided in the radiator 11.

  The switching valve 15 is configured as a three-way valve that switches the flow of cooling water under the control of the electromagnetic solenoid 15A. Further, the water pump 16 is in a state where the coolant is circulated by the driving force from the crankshaft 8 under the control of the electromagnetic pump clutch 16A, and a state where the circulation is stopped by interrupting the driving force from the crankshaft 8. It is configured to be switchable. The radiator fan 17 is configured to be driven by a fan motor 17A.

  A control mode for warming up the engine E is referred to as a warm-up mode, and a control mode for performing cooling is referred to as a cooling mode. When the engine E needs to be warmed up immediately after the engine E is started, The switching valve 15 is set to the warm-up position. Thus, as indicated by the solid arrow in FIG. 1, the cooling water in the cooling path 2A of the water jacket is sent to the bypass path 14 so that the cooling water is circulated back to the engine E without passing through the radiator 11. Temperature rise is promoted. After the warm-up, the engine control device A sets the switching valve 15 to the cooling position, thereby preventing the cooling water from flowing into the bypass passage 14 as indicated by the broken arrow in FIG. Water is circulated in a form that is sent to the radiator 11 to cool the cooling water.

  This cooling device includes a first water temperature sensor S1 that detects the coolant temperature at a position closer to the engine E than a position where the bypass path 14 is connected in the reduction path 13 (a downstream position in the flow direction of the cooling water). A second water temperature sensor S2 for detecting the coolant temperature is provided at a position closer to the radiator 11 than the position where the bypass passage 14 is connected (upstream position in the coolant flow direction).

  Note that the switching valve 15 may be configured to include a valve body configured to rotate or swing. Further, the water pump 16 may be configured to be driven by the driving force of the electric motor.

[Engine control device]
The engine control apparatus A stores control information for each of a plurality of devices in the storage 31, and corrects each control information based on the detected temperature of the first water temperature sensor S1, and the corrected control information and the rotation sensor By controlling the corresponding device based on the timing information from 8S, the fuel efficiency of the engine E is improved and the control for increasing the engine output is realized.

  In particular, the engine control device A according to the present invention suppresses improper control associated with the water temperature drop because the water temperature detected by the first water temperature sensor S1 is lowered when the warm-up mode is switched to the cooling mode. The control information is further corrected so as to.

  The engine control device A includes an input / output port 21 and includes a water temperature control unit 22 that manages the temperature of the cooling water and an engine control unit 30 that controls the operation of the engine E. The engine control unit 30 includes a storage 31 composed of a nonvolatile memory such as an EEPROM, a correction processing unit 32 (an example of a correction processing unit), and a device control unit 33.

  The storage 31 stores control information corresponding to a plurality of devices, and stores three types of forced correction coefficients in the form of map data in the correction map area 31A. That is, three types of forced correction coefficients are stored in the form of a correction map corresponding to water temperature difference information, elapsed time information, and temperature change information, which will be described later. Note that the correction map has a data structure for storing one forced correction coefficient for one piece of information, and realizes a process for extracting a corresponding forced correction coefficient for fixed information without performing an operation. .

  The input / output port 21 receives the detected temperature of the first water temperature sensor S1, the detected temperature of the second water temperature sensor S2, and the timing information detected by the rotation sensor 8S. Further, the input / output port 21 outputs a control signal for executing ignition of the spark plug 5, a control signal for executing fuel injection by the injector 6, and a control signal for setting the rotation phase of the valve opening / closing timing control device 7. To do. Further, the input / output port 21 outputs control signals to the electromagnetic solenoid 15A of the switching valve 15, the pump clutch 16A of the water pump 16, and the fan motor 17A of the radiator fan 17.

  In order to control the spark plug 5, a circuit for generating a high voltage, a power control element for controlling energization, and the like are required. In order to perform fuel injection with the injector 6, a mechanism for pressurizing the fuel is required. These are not shown in the drawings, although they are necessary. Similarly, when the valve opening / closing timing control device 7 is hydraulically controlled, an electromagnetic valve is required and a driver or the like for driving the electromagnetic valve is required, but these are not shown in the drawing.

  The water temperature control unit 22 switches between the warm-up mode and the cooling mode. That is, immediately after the engine E is started, if the detected temperature (water temperature) of the first water temperature sensor S1 has not reached the set value X (see FIG. 5), the switching valve 15 is warmed up by selecting the warm-up mode. Set to position. Thereafter, when the detected temperature of the first water temperature sensor S1 exceeds the set value, the switching valve 15 is set to the cooling position by selecting the cooling mode, and the fan motor 17A of the radiator fan 17 is operated.

  The correction processing unit 32 has a normal correction module 32A for setting a normal correction coefficient for correcting control information based on the detected temperature of the first water temperature sensor S1, and when switching from the warm-up mode to the cooling mode. And a forced correction module 32B for setting a forced correction coefficient for further correcting the control information in order to reduce the influence of the temperature change of the cooling water.

  That is, immediately after switching from the warm-up mode to the cooling mode, the temperature detected by the first water temperature sensor S1 decreases as shown in the graph of FIG. In this way, when switching from the warm-up mode to the cooling mode, the control form is set so that the device is controlled by setting the forced correction coefficient for the set time T and correcting the control information with this forced correction coefficient. Is set.

  In the correction processing unit 32, the control information is corrected with the normal correction coefficient, and the control information corrected in this way is corrected with the forced correction coefficient. The normal correction coefficient is corrected with the forced correction coefficient. The correction form may be set so that the control information is corrected by the correction coefficient corrected as described above. Even when correction is performed in this way, control information having the same value as that corrected by the correction mode described above is obtained as control information after correction.

  The normal correction module 32A acquires control information corresponding to a plurality of devices from the storage 31, and corrects it with a normal correction coefficient based on the detected temperature of the first water temperature sensor S1. The forced correction module 32B acquires transition information corresponding to a temperature change to the low temperature side of the cooling water when the water temperature control unit 22 switches from the warm-up mode to the cooling mode. Based on this, a forced correction coefficient is extracted from the correction map, and the control information is further corrected.

  The device control unit 33 acquires the control information corrected by the correction processing unit 32 and outputs a control signal to each device based on the control information and detection information from the rotation sensor 8S.

  The device control unit 33 outputs an ignition signal for igniting the spark plug 5 with reference to timing information detected by the rotation sensor 8S based on the corrected control signal. Similarly, a fuel injection signal for causing the injector 6 to perform fuel injection is output based on the timing information from the rotation sensor 8S based on the corrected control signal. Further, a control signal for setting the rotational phase of the valve timing control device 7 is output based on the corrected control signal.

  The device of the present invention is not limited to these devices. In the case of the device having the valve opening / closing timing control device 7 for setting the opening degree of the throttle valve and the opening / closing timing of the exhaust valve, the valve opening / closing timing control is performed. The rotational phase of the device 7 may be set.

[Control form]
The flowchart of FIG. 2 shows an outline of the control executed by the engine control device A after the engine E is started, and the flowchart of FIG. 3 shows the outline of the control executed by the water temperature control unit 22. The flowchart of FIG. 4 shows an outline of control when the correction processing unit 32 sets a forced correction coefficient.

  As a result, when the engine E is started, the forced correction coefficient is set to the initial value by initialization, the switching valve 15 is set to the warm-up position, and the pump clutch 16A is driven so that the warm-up mode is set. Control is realized (steps # 101 to # 103).

  In the situation where the engine E is operating, the device control routine shown in the flowchart of FIG. 3 is executed in parallel. In this device control routine, the normal correction module 32A acquires the control information of each device from the storage 31, corrects each control information with a normal correction coefficient based on the detected temperature of the first water temperature sensor S1, and further performs forced correction. Correct with a coefficient. The control information corrected in this way is given from the device control unit 33 to the spark plug 5, the injector 6, and the valve opening / closing timing control device 7 (steps # 201 to # 203).

  Thereby, the control of the device reflecting the coolant temperature is realized. The forced correction coefficient is set to an initial value before being set in a correction coefficient setting routine (step # 300) described later. Since the initial value of the forced correction coefficient is set to a value that does not change the control information (including control information corrected with the normal correction coefficient), only the temperature detected by the first water temperature sensor S1 is set in the warm-up mode. The reflected device control is realized.

  During the control in the warm-up mode, the control for detecting the water temperature is continuously performed by the first water temperature sensor S1 and the second water temperature sensor S2, and it is confirmed that the detected temperature of the first water temperature sensor S1 exceeds the set value X. When the determination is made, the switching valve 15 is set to the cooling position to shift to the cooling mode (steps # 104 to # 106).

  As described above, when the mode is changed from the warm-up mode to the cooling mode, the temperature of the cooling water supplied to the engine E decreases as shown in FIG. Thus, even when the water temperature decreases, the temperature of the engine E as a whole does not significantly decrease, and the control that simply reflects the detected temperature of the first water temperature sensor S1 in the control information is inappropriate.

  For this reason, the correction processing unit 32 sets a forced correction coefficient in response to a decrease in the water temperature, and corrects control information based on the forced correction coefficient to realize proper control of a plurality of devices. (# 300 step). When the water temperature is lowered, rather than ignoring the decrease in the water temperature, the improper control due to the temperature decrease is suppressed. Perform the corresponding control.

  The control in the correction processing unit 32 is shown as a subroutine in the flowchart of FIG. In this correction processing unit 32, the control corresponding to the coolant temperature difference information (temperature difference), the control based on the elapsed time information required for the coolant to decrease by the set temperature, and the coolant decreases within the set time. The forced correction coefficient is set based on any one of the controls based on the temperature change information.

  That is, the correction processing unit 32 acquires the water temperature difference information based on the detected temperature of the first water temperature sensor S1 and the detected temperature of the second water temperature sensor S2 as transition information before the transition from the warm-up mode to the cooling mode, When the water temperature difference information is larger than the first threshold value, a forced correction coefficient is extracted from the correction map region 31A based on the water temperature difference information (steps # 301 to # 303).

  In this control, when the water temperature difference information exceeds the first threshold, a forced correction coefficient that is corrected to be larger as the water temperature difference information is larger is extracted from the correction map region 31A. Thereby, even when the control information is generated from the detected temperature of the first water temperature sensor S1 in a state where the coolant temperature is greatly lowered, appropriate control is realized by reducing this influence.

  A specific processing form is to acquire water temperature difference information based on the detected temperature of the first water temperature sensor S1 and the detected temperature of the second water temperature sensor S2 in a short sampling period before shifting from the warm-up mode to the cooling mode. Thus, the temperature difference of the cooling water at the time of shifting to the cooling mode is predicted. The predicted water temperature difference information is compared with the first threshold value. If the predicted water temperature difference information is larger than the first threshold value, a forced correction coefficient is extracted from the correction map region 31A based on the water temperature difference information. When the predicted water temperature difference information is larger than the first threshold when the warm-up mode is changed to the cooling mode, control is performed to correct the control information based on the already set forced correction coefficient. . As a result, the control information can be quickly and appropriately corrected to control the device.

  Further, as different control modes when acquiring water temperature difference information as transition information, the detected temperature of the first water temperature sensor S1 in the warm-up mode and the detected temperature of the first water temperature sensor S1 after shifting to the cooling mode are used. Based on this, water temperature difference information may be acquired. In the case of such a configuration, the second water temperature sensor S2 need not be provided.

  In step # 302, if it is determined that the water temperature difference information is smaller than the first threshold value, the timer is activated and a process of sampling the detected temperature of the first water temperature sensor S1 in a short time is performed. The correction processing unit 32 acquires, as transition information, elapsed time information (time information measured by a timer) required for the temperature to decrease by a preset value. When the elapsed time information acquired in this way is shorter than the second threshold value, a forced correction coefficient is extracted from the correction map region 31A based on the elapsed time information (steps # 304 to # 306).

  In this control, when the elapsed time information is shorter than the second threshold value, a forced correction coefficient that is corrected to be larger as the elapsed time information is shorter is extracted from the correction map region 31A. Thereby, even when the control information is generated from the detected temperature of the first water temperature sensor S1 in a state where the coolant temperature is greatly lowered, appropriate control is realized by reducing this influence.

  If it is determined in step # 305 that the elapsed time information is longer than the second threshold value, the detected temperature of the first water temperature sensor S1 at the timing when the timer is activated is stored, and the timer sets the set time. The temperature detected by the first water temperature sensor S1 is acquired at the timing at which it is determined that has passed, and the correction processing unit 32 acquires temperature change information from the already stored detected temperature as transition information. When the temperature change information acquired in this way is larger than the third threshold value, a forced correction coefficient is extracted from the correction map region 31A based on the temperature change information (steps # 307 to # 308).

  In this correction coefficient setting routine, when the water temperature difference information is smaller than the first threshold, the elapsed time information is shorter than the second threshold, and the temperature change information is smaller than the third threshold, the forced correction coefficient is maintained at the initial value. Is done.

  When the forced correction coefficient is set based on the transition information in this way, the forced correction coefficient is maintained until a preset set time T elapses from the timing when the warm-up mode is switched to the cooling mode. Then, the control information is corrected with the normal correction coefficient described above and the normal correction coefficient based on the temperature detected by the first water temperature sensor S1, and control of a plurality of devices is executed (steps # 107 and # 108).

  In addition, after the set time T has elapsed, an initial value is set for the forced correction coefficient, the detected temperature of the first water temperature sensor S1 is acquired, and control in the device control routine is performed based on the acquired detected temperature. Continue until reset (steps # 108 to # 111).

[Operation / Effect of Embodiment]
Thus, the engine control apparatus A of the present invention corrects the control information by the normal correction coefficient set based on the detected temperature of the first water temperature sensor S1, and based on the control information thus corrected, the engine E By controlling a plurality of devices that determine the operating conditions of the engine, fuel injection by the injector 6, ignition of the air-fuel mixture by the spark plug 5, and opening and closing of the intake valve reflect the temperature of the engine E. Done in

  In addition, after the engine E is started, after the warm-up mode is changed to the cooling mode, a forced correction coefficient is set based on transition information corresponding to a decrease in the water temperature supplied to the engine E. Correct the control information. Therefore, regardless of the amount of decrease in the water temperature value detected by the first water temperature sensor S1, the device can be controlled based on the temperature detected by the first water temperature sensor S1 in a state where this decrease is corrected.

  In particular, three types of transition information are acquired, and the forced correction coefficient can be set based on one of the three types of transition information. Therefore, the forced correction coefficient can be set finely in a wide temperature range.

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) Only the first water temperature sensor S1 is provided, and the engine controller A is configured to perform control based on the detected temperature. In the case of such a configuration, the second water temperature sensor S2 is not necessary, so that cost reduction is realized. The first water temperature sensor S1 may be arranged so as to detect the water temperature inside the water jacket of the engine E.

(B) In the warm-up mode, the control mode is set so that the water pump 16 is stopped. With this configuration, the cooling device does not need to include the bypass 14, which not only simplifies the configuration but also reduces the cost. In particular, the water pump 16 can be configured to be driven by an electric motor.

(C) A water amount sensor that detects the amount of water is provided for the supply passage 12 or the reduction passage 13 of the cooling device, and correction is performed so that the values of the normal correction coefficient and the forced correction coefficient are adjusted based on the detected temperature of the water amount sensor The processing unit 32 is configured. That is, when the amount of water flowing through the cooling device per unit time is large, it is conceivable that the overall temperature of the engine E when the warm-up mode is switched to the cooling mode is greatly reduced. Therefore, when the amount of water is large, it is possible to set the control mode so as to set a correction coefficient to be corrected larger.

(D) In the above-described embodiment, the forced correction coefficient is set only once in the correction processing unit 32. However, for example, a plurality of forced correction coefficients may be set based on the passage of time or temperature change. . Thus, by setting the forced correction coefficient a plurality of times, it is possible to more appropriately control the device after shifting from the warm-up mode to the cooling mode.

(E) In the above-described embodiment, the forced correction coefficient is returned to the initial value after the set time T has elapsed after the transition from the warm-up mode to the cooling mode, but the temperature detected by the first water temperature sensor S1 The control mode may be set so that the forced correction coefficient is returned to the initial value when the value reaches a preset temperature.

(F) Instead of the control for setting the normal correction coefficient based on the detected temperature of the first water temperature sensor S1, control information corresponding to the detected temperature is extracted from the storage 31 based on the detected temperature of the first water temperature sensor S1. Set the control mode to By setting the control mode in this way, it is not necessary to perform processing such as calculation for correcting the control information based on the normal correction coefficient, and the load on the engine control apparatus A can be reduced.

  The present invention is applicable to a control device for an internal combustion engine configured to control devices involved in the operation of the internal combustion engine based on the temperature of the cooling water.

5 Device (Ignition plug)
6 devices (injectors)
7 Device (Valve Open / Close Timing Control Device)
11 Radiator 12 Supply path 13 Reduction path 14 Bypass path 15 Switching valve 22 Water temperature control unit 30 Engine control unit 32 Correction processing unit (correction processing unit)
E Internal combustion engine
S1 First water temperature sensor S2 Second water temperature sensor X Setting value

Claims (3)

A warm-up mode comprising a supply path for sending cooling water of the internal combustion engine to the radiator, and a reduction path for returning the cooling water from the radiator to the internal combustion engine, and increasing the temperature of the internal combustion engine without sending the cooling water to the radiator; In this warm-up mode, when the temperature of the cooling water rises to a preset value, the cooling water of the internal combustion engine is sent to the radiator via the supply path and returned to the internal combustion engine from the reduction path for cooling. It has a water temperature controller that switches between cooling modes,
The control information is set based on the temperature detected by the first water temperature sensor that detects the temperature of the cooling water, and the engine control unit controls the device that determines the operating condition of the internal combustion engine based on the control information.
Predicted when the water temperature control unit switches from the warm-up mode to the cooling mode, or the control information corresponding to the temperature change to the low temperature side of the measured cooling water. A correction processing unit that corrects to a value that reduces the influence on control is provided .
A second water temperature sensor for detecting a temperature of cooling water sent from the radiator to the internal combustion engine; and the correction processing unit detects a temperature detected by the first water temperature sensor and a detection by the second water temperature sensor in a warm-up mode. A temperature difference is predicted from the temperature, and when the predicted temperature difference exceeds the first threshold value, a correction coefficient for correcting the control information is set in advance,
When the temperature difference does not exceed the first threshold value, the correction processing unit detects a temperature detected by the first water temperature sensor immediately before switching from the warm-up mode to the cooling mode, and the first water temperature after switching. A control apparatus for an internal combustion engine, which sets a correction coefficient for correcting the control information when an elapsed time after switching until a temperature difference based on a temperature detected by a sensor reaches a set value is shorter than a second threshold . When the elapsed time is longer than the second threshold, the correction processing unit detects a temperature detected by the first water temperature sensor immediately before switching from the warm-up mode to the cooling mode, and timing when a set time has elapsed after switching control apparatus for an internal combustion engine according to claim 1 for setting a correction coefficient for correcting the control information based on the temperature difference based on the detected temperature of the first water temperature sensor at. A bypass path connecting the supply path and the reduction path is formed, and the cooling water of the internal combustion engine is returned from the bypass path to the internal combustion engine in the warm-up mode, and the cooling water of the internal combustion engine is returned to the internal combustion engine in the cooling mode. A switching valve for returning to the internal combustion engine from the reduction path after being supplied from the supply path to the radiator;
3. The control device for an internal combustion engine according to claim 1, wherein the first water temperature sensor is provided at a position for detecting a water temperature closer to the internal combustion engine than a connection position where the bypass path is connected in the reduction path.

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