JP2014218938A - Cooling control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable cooling control device that enables high followability of an actual water temperature to a target water temperature and that can easily perform cooling control for making the actual water temperature correspond to the target water temperature by operating an electric cooling device.SOLUTION: In a cooling control device, a target water temperature is set based on an engine operating state (S400), and a target heat radiation efficiency is set by performing F/B control on the basis of a deviation between the target water temperature and an actual water temperature and F/F control based on engine heat quantity (S402). In the cooling control device, a fan operating rate of a radiator fan is acquired from the target heat radiation efficiency and a heat radiation model (S404), and a cooling water flow rate that indicates a product of a pump operating rate and a thermostat valve opening rate is acquired from the heat radiation model on the basis of the target heat radiation efficiency and the fan operating rate (S406). In the cooling control, the water pump operating rate and the thermostat valve opening rate are set from the cooling water flow rate on the basis of an adaptation map in accordance with engine speed and a water temperature (S408).

Description

  The present invention relates to a cooling control device that controls an electric cooling device among a plurality of cooling devices that cool an engine.

  Conventionally, in order to improve the efficiency of an engine mounted on a vehicle, the coolant temperature of the engine is controlled in accordance with the engine operating state. For example, when the engine is operating at a low load, the water temperature is increased to reduce the loss due to friction and improve the fuel efficiency. When the engine is operating under load, the engine temperature is reduced by reducing the water temperature.

  The water temperature of the cooling water is adjusted by a cooling device such as a radiator fan, a water pump for circulating the cooling water, and a thermostat as a flow rate control valve for controlling the flow rate of the cooling water (see, for example, Patent Document 1).

  In the case of a mechanical radiator fan and water pump, or a thermosensitive thermostat that compresses and expands according to temperature, the amount of cooling is determined by the engine speed and water temperature. On the other hand, if any of the radiator fan, the water pump, and the thermostat is electric, the actual water temperature of the engine can be adjusted to the target water temperature by controlling the cooling amount by driving the electric cooling device. .

JP 2010-96042 A

When adjusting the actual water temperature to the target water temperature, for example, it is conceivable to feedback control the drive of the electric cooling device based on the deviation between the target water temperature and the actual water temperature.
However, even if the drive of the electric cooling device is controlled, the response of the actual water temperature is low, so if the engine operating state changes suddenly, such as when suddenly accelerating from the idling state, the deviation between the target water temperature and the actual water temperature In the feedback control based on, the followability of the actual water temperature with respect to the target water temperature is low. Furthermore, overshoot and undershoot are likely to increase when the actual water temperature approaches the target water temperature.

  In addition, if feedback control is performed on each electric cooling device based on the deviation between the target water temperature and the actual water temperature, hunting may occur when the actual water temperature converges to the target water temperature because the control on the cooling device interferes. There is.

Although the above problem may be reduced if the feedback control gain is finely set in accordance with the operating state of the engine, there is a problem that a large number of adaptation man-hours are required.
The present invention has been made to solve the above-described problems, and has high and stable followability of the actual water temperature with respect to the target water temperature, and drives the electric cooling device to match the actual water temperature with the target water temperature. It is an object of the present invention to provide a cooling control device that easily realizes cooling control.

  The cooling control device of the present invention controls an electric cooling device among a plurality of cooling devices that cool the engine. The water temperature setting means sets the target water temperature of the engine based on the engine operating state, and the heat generation amount acquisition means acquires the heat generation amount of the engine as the engine heat amount. The heat dissipation efficiency means sets the target heat dissipation efficiency of the engine to match the actual water temperature of the engine with the target water temperature based on the engine heat quantity acquired by the heat quantity acquisition means, and the control means sets the target heat dissipation set by the heat dissipation efficiency means A cooling amount by the electric cooling device for achieving the efficiency is acquired from the heat dissipation model, and the electric cooling device is controlled based on the acquired cooling amount.

The heat dissipation efficiency is defined as a state in which the engine exhibits the maximum cooling performance by a cooling device, for example, as 100%.
The amount of heat generated by the engine changes according to the operating state of the engine, and the actual water temperature of the engine changes with a delay according to the amount of heat generated by the engine, so the target heat dissipation efficiency of the engine for matching the actual water temperature to the target water temperature, It can be set appropriately in consideration of changes in the actual water temperature based on the amount of heat generated by the engine.

  Thereby, the cooling amount by the electric cooling device for achieving the target heat dissipation efficiency can be appropriately set in consideration of the change in the actual water temperature. Therefore, the followability of the actual water temperature with respect to the target water temperature is high and stable.

  In addition, a common index called the target heat dissipation efficiency of the engine is set to match the actual water temperature with the target water temperature, and the amount of cooling by the electric cooling device to achieve the target heat dissipation efficiency is obtained from the heat dissipation model. Cooling control for controlling the cooling device to match the actual water temperature with the target water temperature can be easily realized.

  When the cooling amount is determined by the engine speed, such as a mechanical radiator fan and water pump, or a cooling device that determines the cooling amount by the water temperature is used, such as a thermal thermostat. May be obtained by combining the cooling amount by the cooling device determined by the engine speed or the water temperature or the like with the cooling amount by the electric cooling device.

The block diagram which shows the cooling control system by this embodiment. The block diagram which shows the software structure of a cooling control part. The characteristic view which shows the relationship between target heat radiation efficiency and the drive rate of a radiator fan. The characteristic view which shows the relationship between target heat radiation efficiency and a cooling water flow rate. The flowchart which shows a cooling control process. The time chart which shows cooling control.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Cooling control system)
FIG. 1 shows a cooling control system 10 of the present embodiment for cooling a gasoline engine (hereinafter also simply referred to as “engine”) 2. The cooling control system 10 includes an engine ECU (hereinafter also simply referred to as “ECU”) 20, a radiator fan 30, a water pump (W / P) 32, a thermostat 34, a water temperature sensor 40, and the like. The radiator fan 30, the water pump 32, and the thermostat 34 are electric cooling devices.

The ECU 20 controls the radiator fan 30, the water pump 32, and the thermostat 34 to adjust the actual water temperature of the engine 2 to the target water temperature.
ECU20 is provided with the target water temperature calculation part 22 and the engine cooling control part 24, and is mainly comprised by the microcomputer provided with CPU, RAM, ROM, flash memory, etc.

  The target water temperature calculation unit 22 calculates the target water temperature of the engine based on the adaptation map or the like based on the current actual water temperature of the engine 2, the engine output, the engine oil temperature, and the water temperature parameters such as the heating state by the cooling water. To set. If the target water temperature is set higher, the engine friction loss can be reduced, but overheating tends to occur. Therefore, the target water temperature calculation unit 22 appropriately sets the target water temperature based on the above-described water temperature parameter in consideration of the safety margin.

  The target water temperature calculation unit 22 may set the target water temperature based on at least one of the output of the engine, the oil temperature of the engine, and the heating state by the cooling water, and the actual water temperature. In this case, by setting the target water temperature using at least the engine oil temperature as a water temperature parameter in addition to the actual water temperature, the target water temperature that does not overheat based on the actual water temperature can be set, and the friction of the engine 2 can be reduced based on the oil temperature. The target water temperature to be reduced can be set.

  Further, in a vehicle where the engine 2 that is the internal combustion engine is frequently stopped, such as a vehicle that performs idling stop or a hybrid vehicle, the target water temperature is set even when the engine 2 is stopped until the engine 2 is restarted. It is desirable to prevent the actual water temperature from rising and overheating while the engine is stopped by driving the cooling device. Further, it is desirable to prevent overheating while the engine is stopped by setting the target water temperature and driving the cooling device even after the vehicle start switch is turned off and the engine 2 is stopped.

  The engine cooling control unit 24 sets the target water temperature set by the target water temperature calculation unit 22, the actual water temperature of the engine 2 detected by the water temperature sensor 40, the engine speed, the intake rate of the cylinder, and the ignition efficiency based on the ignition timing. Based on the engine operating state such as the air-fuel ratio and the engine operating environment such as the vehicle speed and the outside air temperature, the target heat dissipation efficiency for matching the actual water temperature of the engine 2 with the target water temperature is set.

  When the engine 2 is a diesel engine, the ignition efficiency based on the ignition timing estimated from the combustion injection timing is used instead of the ignition efficiency. The ignition efficiency or the ignition efficiency represents the ratio of the output torque at an arbitrary ignition timing or ignition timing with respect to the maximum output torque.

  The engine cooling control unit 24 acquires the cooling amount by the radiator fan 30, the water pump 32, and the thermostat 34 for achieving the set target heat dissipation efficiency from the heat dissipation model, and controls each cooling device based on the acquired cooling amount. To do.

  Specifically, as shown in FIG. 2, the engine cooling control unit 24 includes feedback (F / B) control from the proportional controller 100 and the integral controller 102, and the heat generation amount and heat release amount of the engine 2 as the engine heat amount. The target heat dissipation efficiency of the engine 2 is set by feedforward (F / F) control based on the above.

  The heat radiation amount of the engine 2 is not the heat radiation amount due to the operation of the radiator fan 30, the water pump 32, and the thermostat 34 as a cooling device, but is determined by the engine operating environment such as the vehicle speed and the outside temperature. Represents the amount of heat released.

  The heat dissipation efficiency of the engine 2 is obtained by normalizing the cooling performance of the entire cooling device including the radiator fan 30, the water pump 32, and the thermostat 34 to 0 to 100%. A state where the cooling device is driven and the engine 2 exhibits the maximum cooling performance is defined as 100%.

  The heat dissipation model is a model representing the correlation between the heat dissipation efficiency and those obtained by normalizing the driving rate of the radiator fan 30 and the water pump 32 and the valve opening rate of the thermostat 34 to 0 to 100%, respectively. A state where each cooling device is operating at the maximum cooling amount is defined as a driving rate or a valve opening rate of 100%.

  When the actual water temperature is sufficiently lower than the target water temperature, it is not necessary to cool the engine 2, so the engine cooling control unit 24 sets the target heat dissipation efficiency to 0%, and the radiator fan 30, the water pump 32, and the thermostat 34. The driving for and may be stopped. For example, if the actual water temperature drops sufficiently while the engine is stopped, the target heat dissipation efficiency is set to 0% by setting the target water temperature to a temperature sufficiently higher than the actual water temperature, and the drive to the cooling device is stopped. can do.

  The proportional controller 100 and the integral controller 102 feedback-control the target heat dissipation efficiency based on the deviation between the target water temperature and the actual water temperature. By using the integration controller 102 for F / B control, the actual water temperature can be made to consistently match the target water temperature.

  The F / F controller 110 determines the output of the engine 2 from the engine speed and the cylinder intake rate of the engine 2, and determines the thermal efficiency from the ignition efficiency and the air-fuel ratio. And the emitted-heat amount of the engine 2 is determined based on an engine output and thermal efficiency.

  For example, the F / F controller 110 calculates the heat generation amount of the engine 2 by a polynomial expression using the engine speed, the cylinder intake rate, the ignition efficiency, and the air-fuel ratio. In this case, it is desirable to use the heat generated by smoothing the calculation result by the polynomial as a heat generation amount, since a rapid change in the target heat dissipation efficiency can be suppressed.

Then, the F / F controller 110 feed-forward-controls the target heat dissipation efficiency from the adaptation map based on the heat generation amount of the engine 2 and the adaptation map based on the heat dissipation amount of the engine 2.
The cooling controller 120 acquires the target heat dissipation efficiency for the engine 2 set by the F / B control by the proportional controller 100 and the integral controller 102 and the F / F control by the F / F controller 110.

  The cooling controller 120 then radiates the target heat release with the cooling amount according to the air volume by the radiator fan 30 for matching the actual water temperature with the target water temperature, and the cooling amount according to the cooling water flow rate with the water pump 32 and the thermostat 34. It acquires from a heat dissipation model based on efficiency, and drives and controls radiator fan 30, water pump 32, and thermostat 34 based on the acquired amount of cooling.

  The air volume by the radiator fan 30 is determined by the driving rate of the radiator fan 30, and the cooling rate by the water pump 32 and the thermostat 34 is the product of the driving rate of the water pump 32 and the valve opening rate of the thermostat 34. Determined by.

  The cooling controller 120 calculates the fan drive rate from the heat transfer equation shown in the following equation (1) as a heat dissipation model representing the correlation between the amount of cooling by the radiator fan 30 and the amount of cooling by the water pump 32 and the thermostat 34 and the target heat dissipation efficiency. And the pump drive rate x the thermostat valve opening rate. In the formula (1), the radiator fan is abbreviated as “fan”, and the water pump is abbreviated as “pump”.

Target heat dissipation efficiency = A2 × {fan driving rate × A1 × (pump driving rate × thermostat valve opening rate) / 100} / {fan driving rate + A1 × (pump driving rate × thermostat valve opening rate) / 100} ( 1)
In Expression (1), A1 and A2 are weighting coefficients. The air volume for cooling the radiator is determined by the fan driving rate of the equation (1), and the cooling water flow rate is determined by the cooling water flow rate represented by the pump driving rate x the thermostat valve opening rate. The cooling water flow rate becomes 100% when both the pump driving rate and the thermostat valve opening rate are 100%.

  In the present embodiment, the air volume of the radiator fan 30 is not controlled by the magnitude of the drive current, but the air volume is switched by turning on and off the energization of a plurality of fans, for example. The configuration is controlled. Therefore, if the radiator fan 30 is frequently turned on and off to control the air volume according to the driving rate, problems such as noise and relay switch sticking occur.

  Therefore, the cooling controller 120 first determines the drive rate of the radiator fan 30 when controlling each cooling device. This suppresses frequent changes in the drive rate of the radiator fan 30.

  For example, assuming that the driving rate of the radiator fan 30 is set to four driving stages of no driving, low driving, middle driving, and high driving as shown in the conformity map of FIG. Accordingly, one of the four drive rates of no drive, low drive, medium drive, and high drive is selected from the matching map.

  Hysteresis is provided by setting the threshold value when increasing from the low driving stage to the high driving stage to a value larger than the threshold value when decreasing from the high driving stage to the low driving stage. Thus, the driving stage of the radiator fan 30 is frequently switched at the boundary of each stage to prevent the radiator fan 30 from being turned on / off.

  When the cooling controller 120 determines the driving rate of the radiator fan 30 from the adaptation map of FIG. 3 based on the target heat dissipation efficiency, the cooling controller 120 obtains the pump driving rate x the thermostat valve opening rate that is the cooling water flow rate from the equation (1).

  When the radiator fan is mechanically driven by an engine, the driving rate of the radiator fan is determined by the engine speed. In this case, when the engine speed is the standard maximum speed, the driving rate of the radiator fan is 100%. Then, by substituting the driving rate of the radiator fan determined by the engine speed into the equation (1), the cooling water flow rate represented by the pump driving rate x the thermostat valve opening rate can be acquired.

  For example, as shown in FIG. 4, the cooling controller 120 generates a matching map representing the correlation between the cooling water flow rate and the target heat dissipation efficiency according to the four stages of the driving rate of the radiator fan 30, not from the equation (1). As a heat dissipation model, a coolant flow rate corresponding to the four-stage driving rate of the radiator fan 30 and the target heat dissipation efficiency may be acquired. In FIG. 4, the correlation 200 corresponds to no driving, the correlation 202 corresponds to low driving, the correlation 204 corresponds to medium driving, and the correlation 206 corresponds to high driving.

  When the radiator fan 30 is not driven, the fan driving rate becomes 0%, and the cooling water flow rate cannot be calculated from the equation (1). In this case, the coolant flow rate may be acquired from the correlation 200 in FIG.

  Then, in order to optimize from the viewpoint of noise and power consumption, the cooling water flow rate obtained from the equation (1) or the adaptation map of FIG. 4 is obtained based on the adaptation map based on the engine speed and the water temperature. Then, the drive rate of the water pump 32 and the valve opening rate of the thermostat 34 are determined.

  If the water pump 32 is mechanical or the thermostat 34 is thermal, the pump drive rate is determined by the engine speed if the water pump 32 is mechanical, and if the thermostat 34 is thermal, the thermostat is opened by the water temperature. The rate is determined.

  In this case, the driving rate or opening of the electric cooling device of the water pump 32 or the thermostat 34 is determined from the pump opening rate determined by the engine speed or the thermostat valve opening rate determined by the water temperature and the cooling water flow rate. What is necessary is just to determine a valve rate.

(Cooling control process)
A cooling control process executed by the ECU 20 will be described with reference to FIGS. In FIG. 5, “S” represents a step.

  The ECU 20 sets the target water temperature based on the engine operating state (S400). If the actual water temperature is sufficiently low while the engine is stopped, the target heat dissipation efficiency is set to 0% by setting the target water temperature to a constant value that is higher than the actual water temperature by a predetermined value or more as shown in FIG. Is done. Thereby, the drive with respect to the radiator fan 30, the water pump 32, and the thermostat 34 is stopped.

  When the engine 2 is started and the actual water temperature increases due to the heat generated by the engine 2 and approaches the target water temperature, the ECU 20 performs F / B control based on the deviation between the target water temperature and the actual water temperature, and F / B based on the engine heat quantity. The target heat dissipation efficiency is set by the F control (S402), and the driving rate of the radiator fan 30 is acquired from the target heat dissipation efficiency and the conformity map of FIG. 3 as the heat dissipation model (S404).

  When the fan drive rate of the radiator fan 30 is acquired, the ECU 20 determines, based on the target heat dissipation efficiency and the fan drive rate, the pump drive rate that is the cooling water flow rate from the conformity map shown in Formula (1) or FIG. X Acquire the thermostat valve opening rate (S406).

  Then, the ECU 20 sets the drive rate of the water pump 32 and the valve opening rate of the thermostat 34 from the cooling water flow rate based on the matching map based on the engine speed and the water temperature (S408).

  As shown in FIG. 6, in the cooling control process when the engine is stopped, the ECU 20 sets the target water temperature to a constant value that is sufficiently higher than the actual water temperature. As a result, the target heat dissipation efficiency is set to 0%, and the driving rate of the radiator fan 30 and the water pump 32 and the valve opening rate of the thermostat 34 are set to 0%.

  In the time chart shown in FIG. 6, for the sake of brevity, the driving rate of the radiator fan 30 is either 0% or 100%, and the valve opening rate of the thermostat 34 is either 0% or 100%. It is set. The valve opening rate of the thermostat 34 is set to 100% when the water pump 32 is driven, and is set to 0% when the water pump 32 is not driven.

  In the cooling control process after the engine is started, the ECU 20 warms up the engine by increasing the engine speed, and keeps the target water temperature high in order to reduce friction loss. Since the target heat dissipation efficiency is set to 0% while the actual water temperature is lower than the target water temperature by a predetermined temperature or more, the drive rate of the radiator fan 30 and the water pump 32 and the valve opening rate of the thermostat 34 are set to 0%. The

  When the heat generation amount of the engine 2 increases due to the increase in the engine speed and the actual water temperature rises and approaches the target water temperature, the ECU 20 performs F / B control based on the deviation between the target water temperature and the actual water temperature, and the engine heat amount as the engine heat amount. The target heat dissipation efficiency is set by F / F control based on the heat generation amount and the heat dissipation amount.

  Even if the target heat dissipation efficiency increases and becomes equal to or higher than threshold value 2, while the driving rate of radiator fan 30 is set to 0% due to the hysteresis between threshold value 1 and threshold value 2 while radiator fan 30 is not driven. .

  In this case, for example, the cooling water flow rate is acquired from the target heat dissipation efficiency using the correlation 200 shown in FIG. 4, and the drive rate of the water pump 32 and the valve opening rate of the thermostat 34 are set from the cooling water flow rate. As described above, in the time chart of FIG. 6, when the water pump 32 is driven, the valve opening rate of the thermostat 34 is set to 100%.

  When the heat generation amount of the engine 2 increases and the actual water temperature rises and approaches the target water temperature, the target heat dissipation efficiency increases and the pump drive rate increases due to the F / F control based on the heat generation amount of the engine 2. The overshoot when the temperature rises and becomes higher than the target water temperature can be minimized.

  When the actual water temperature rises and the warm-up operation ends, the ECU 20 decreases the engine speed and gradually decreases the target water temperature. When the target water temperature decreases and the deviation between the target water temperature and the actual water temperature increases, the ECU 20 increases the target heat dissipation efficiency mainly by F / B control. When the target heat dissipation efficiency rises to the threshold value 1 or more, the driving rate of the radiator fan 30 is set to 100%, and the radiator fan 30 is driven. When the radiator fan 30 is driven and the cooling performance is increased, the drive rate of the water pump 32 is decreased to offset the increase in the cooling performance.

  When the actual water temperature is lower than the target water temperature, the ECU 20 decreases the target heat dissipation efficiency. Even if the target heat dissipation efficiency falls below the threshold value 1, the radiator fan 30 continues to be driven by the hysteresis between the threshold value 1 and the threshold value 2 until it falls below the threshold value 2. When the target heat dissipation efficiency falls below the threshold value 2, the driving of the radiator fan 30 is stopped. When the driving of the radiator fan 30 is stopped and the cooling performance is reduced, the reduction in the cooling performance is offset by increasing the drive rate of the water pump 32.

  When the target water temperature decreases and becomes constant, and the driver depresses the accelerator in a state where the actual water temperature matches the target water temperature, the engine speed increases and the engine output increases, the heat generation amount of the engine 2 increases. When the heat generation amount of the engine 2 increases, the target heat dissipation efficiency increases due to the F / F control.

  As a result, the drive rate of the water pump 32 increases before the actual water temperature increases due to the increase in the amount of heat generation and the F / B control is executed. As a result, the amount of heat generated by the engine 2, the amount of heat released according to the vehicle speed and the outside air temperature, and the total amount of cooling by the radiator fan 30, the water pump 32, and the thermostat 34 are balanced, so the actual water temperature follows the target water temperature. Can maintain a consistent state.

  Since the radiator fan 30 is driven when the target heat dissipation efficiency increases to a threshold value 2 or more, the increase in cooling performance is offset by decreasing the drive rate of the water pump 32. When the target heat dissipation efficiency decreases with a decrease in the engine speed and falls below the threshold value 2, the driving of the radiator fan 30 is stopped.

  In the embodiment described above, in addition to the F / B control based on the deviation between the target water temperature and the actual water temperature, the F / F control based on the heat generation amount and the heat radiation amount of the engine 2 as the engine heat amount, the engine 2 The target heat dissipation efficiency of the engine 2 for matching the actual water temperature with the target water temperature is set.

  The heat generation amount of the engine 2 changes according to the engine operating state, and the heat dissipation amount of the engine 2 changes according to the engine operating environment. Since the actual water temperature of the engine changes with a delay with respect to the heat generation amount and the heat dissipation amount of the engine 2, the target heat dissipation efficiency of the engine 2 for making the actual water temperature coincide with the target water temperature is based on the heat generation amount and the heat dissipation amount of the engine 2. Therefore, it can be set appropriately in consideration of changes in actual water temperature.

  Thereby, the cooling amount by the radiator fan 30, the water pump 32, and the thermostat 34 for achieving target heat radiation efficiency can be set appropriately in consideration of the change in the actual water temperature. Therefore, the followability of the actual water temperature with respect to the target water temperature is high and stable.

  In order to make the actual water temperature coincide with the target water temperature, a common index called target heat dissipation efficiency of the engine 2 is set, and the cooling amount by the radiator fan 30, the water pump 32, and the thermostat 34 for achieving the target heat dissipation efficiency is dissipated. Since it is acquired from the model, it is easy to realize cooling control in which each cooling device is driven to match the actual water temperature with the target water temperature.

[Other Embodiments]
In the present invention, at least one of the plurality of cooling devices that cool the engine 2 may be electric, and the cooling amount for achieving the target heat dissipation efficiency is acquired from the heat dissipation model for the electric cooling device.

  Moreover, it is not necessary to provide the radiator fan 30, the water pump 32, and the thermostat 34 as a cooling device, and the structure provided with the radiator fan 30, and either the water pump 32 or the thermostat 34 may be sufficient.

In the radiator fan, the cooling amount does not change discontinuously by turning on and off, and the cooling amount may change continuously according to the drive rate.
Further, the electric flow control valve for controlling the flow rate of the cooling water is not limited to the electric thermostat, and an electromagnetic valve whose opening degree is controlled by a duty ratio may be used.

In the said embodiment, the emitted-heat amount and the emitted-heat amount of the engine 2 were employ | adopted as an engine heat amount. On the other hand, it is good also considering only the emitted-heat amount of the engine 2 as an engine heat amount.
As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

2: engine, 10: cooling control system, 20: ECU (cooling control device), 22: target water temperature calculation unit (water temperature setting means), 30: radiator fan (cooling device), 32: water pump (cooling device), 34 : Thermostat (cooling device, flow control valve), 100: proportional controller (heat dissipation efficiency means), 102: integral controller (heat dissipation efficiency means), 110: F / F controller (heat quantity acquisition means, heat dissipation efficiency means), 120: Cooling controller (control means)

Claims (14)

A cooling control device (20) for controlling an electric cooling device (30, 32, 34) among a plurality of cooling devices for cooling the engine (2),
Water temperature setting means (22, S400) for setting a target water temperature of the engine based on the engine operating state;
A calorific value acquisition means (24, 110) for acquiring the calorific value of the engine as the engine calorific value;
Heat dissipation efficiency means (24, 100, 102, 110, S402) for setting a target heat dissipation efficiency of the engine for matching the actual water temperature of the engine with the target water temperature based on the engine heat quantity acquired by the heat quantity acquisition means; ,
Control means (24,) for acquiring a cooling amount by the electric cooling device for achieving the target heat dissipation efficiency set by the heat dissipation efficiency means from a heat dissipation model and controlling the electric cooling device based on the cooling amount 120, S404, S406, S408),
A cooling control device comprising:   The plurality of cooling devices include at least one of a water pump (32) for circulating the cooling water of the radiator and a flow rate control valve (34) for controlling the flow rate of the cooling water, and a radiator fan (30) for blowing air to the radiator. The cooling control device according to claim 1, wherein: The plurality of cooling devices are the radiator fan, the water pump, and the flow control valve, and at least one of the water pump and the flow control valve is electric,
The control means acquires the cooling amount by the water pump and the flow rate control valve from the heat dissipation model based on the cooling amount by the radiator fan and the target heat dissipation efficiency.
The cooling control device according to claim 2.   The said control means acquires the cooling amount by the said electric cooling device among the said water pump and the said flow control valve from the adaptation map by an engine speed and the water temperature of an engine. Cooling control device.   The said water temperature setting means sets the said target water temperature based on at least any one of the output of an engine, the oil temperature of an engine, and the heating state by the said cooling water, and the water temperature of an engine. 5. The cooling control apparatus according to any one of 4 to 4.   6. The cooling control apparatus according to claim 5, wherein the water temperature setting means sets the target water temperature from a conformity map based on an engine water temperature and an engine oil temperature.   The cooling control apparatus according to any one of claims 1 to 6, wherein the water temperature setting means sets the target water temperature even when the engine is stopped.   The cooling control according to any one of claims 1 to 7, wherein the heat quantity acquisition unit acquires an engine heat release amount corresponding to an engine operating environment in addition to the heat generation amount as the engine heat quantity. apparatus.   The heat dissipation efficiency means sets the target heat dissipation efficiency by feedback control based on a deviation between the target water temperature and the actual water temperature and feedforward control based on the engine heat quantity. The cooling control device according to any one of claims 8 to 9.   The cooling control apparatus according to claim 9, wherein the feedback control is executed by proportional control and integral control.   The heat quantity acquisition means acquires the heat generation amount of the engine from a polynomial for calculating a thermal efficiency using an engine speed, an intake rate, an ignition efficiency, and an air-fuel ratio, and an annealing filter. The cooling control apparatus according to any one of 1 to 10.   The cooling control device according to any one of claims 1 to 11, wherein the control means uses a heat transfer equation based on a flow rate of a radiator and a flow rate of cooling water as the heat dissipation model.   The cooling control device according to any one of claims 1 to 11, wherein the control unit uses a matching map based on an air volume of a radiator and a flow rate of cooling water as the heat dissipation model.   The control means sets at least one threshold value of the target heat dissipation efficiency, which is set to be larger when the target heat dissipation efficiency is decreased than when the target heat dissipation efficiency is decreased, The cooling control device according to claim 1, wherein a cooling amount by the radiator fan is set.

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