JP2008248715A - Electric water pump control device for automobile, and air conditioning system for automobile having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric water pump control device for an automobile reducing power consumption of an electric water pump for flowing cooling water to a cooling water circuit for air conditioning, and to provide an air conditioning system for an automobile having the control device, in an automobile performing an idling stop control. <P>SOLUTION: With respect to a system in which the electric water pump 4 is disposed to the cooling water circuit B for air conditioning, when an engine E is stopped by the idling stop control, the electric water pump 4 is started to flow the cooling water to the cooling water circuit B for air conditioning so as to secure air conditioning performance. At this time, a temperature of the cooling water flowing in the cooling water circuit B for air conditioning is detected, and the drive of the electric water pump 4 is controlled so that a flow rate of the cooling water flowing in the cooling water circuit B for air conditioning becomes lower as the temperature of the cooking water gets higher. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control device for an electric water pump used for air conditioning in a vehicle interior by an automotive air conditioning system, and an automotive air conditioning system including the control device. In particular, the present invention relates to a measure for reducing the power consumed by the electric water pump.

  Conventionally, a cooling water circulation circuit has been provided as a cooling system for an automobile engine. This cooling water circulation circuit is, for example, a mechanical water pump that operates by receiving a rotational driving force from a water jacket, a radiator, or an engine crankshaft formed in an engine body, as disclosed in Patent Document 1 below. Etc. The engine is cooled by circulating the cooling water through the cooling water circulation circuit by the operation of the mechanical water pump accompanying the driving of the engine.

  In addition, the interior of the vehicle is heated by using the amount of heat of the cooling water having a relatively high temperature (for example, 80 ° C.) circulating through the cooling water circulation circuit. In other words, an air conditioning cooling water circuit branched from the cooling water circulation circuit is provided, and heat is exchanged between the cooling water and the air conditioning air by a heater core provided in the air conditioning cooling water circuit to heat the air ( The heated air is supplied to the passenger compartment as conditioned air.

  On the other hand, as one of the vehicle control methods in view of the recent global environmental problems, when a predetermined condition is satisfied, such as when the vehicle stops waiting for an intersection signal, the fuel supply to the combustion chamber is stopped (so-called fuel cut) The engine is stopped, so-called “idling stop control” has been proposed that can suppress the exhaust gas emission amount and improve the fuel consumption rate (see, for example, Patent Document 2 below).

  However, when the engine is stopped by the idling stop control, the mechanical water pump is also stopped, and the cooling water circulation operation is not performed. As a result, the cooling water (cooling water serving as a heat source for heating the air) does not flow in the air conditioning cooling water circuit, and it becomes difficult to meet the passenger's heating request.

In view of this point, for example, as disclosed in Patent Document 3 below, even if the air conditioning cooling water circuit is provided with an electric water pump and the engine is stopped by the idling stop control, the electric water pump It has been proposed that the cooling water can be caused to flow through the cooling water circuit for air conditioning by the operation of the above, thereby maintaining the heating capacity.
JP 2003-65051 A JP 2002-70699 A JP 2004-204823 A

  By the way, when the engine is stopped by the idling stop control as described above, the system in which the cooling water is caused to flow through the air conditioning cooling water circuit by the operation of the electric water pump has the following problems.

  That is, the electric water pump is only switched between start and stop according to the driving state of the engine. That is, the engine is stopped when the engine is driven, and only driven at a constant output when the engine is stopped. Therefore, even when the heating requirement is small, the cooling water may be supplied to the air conditioning cooling water circuit at a large flow rate. . For this reason, the cooling water may be supplied to the air conditioning cooling water circuit more than necessary, and the power consumed by the electric water pump is wasted, leading to deterioration in energy efficiency.

  In addition, the amount of electricity stored in the battery may be reduced due to the waste of electric power by the electric water pump. Therefore, it is necessary to control the operation of the engine so that this amount of electricity can be sufficiently secured. For this reason, even when the vehicle stops due to a signal at an intersection, the engine cannot be stopped in order to ensure a sufficient amount of battery charge. The opportunity to stop the engine by `` stop control '' will be extremely reduced, making it impossible to expect an improvement in the fuel consumption rate, making it difficult to reduce the exhaust gas emissions, and contributing sufficiently to the improvement of global environmental problems Invited a situation that would be difficult.

  An electric water pump is adopted instead of the mechanical water pump that operates in response to the driving force of the engine, and the electric water pump is continuously operated regardless of when the engine is driven or when the engine is stopped by the idling stop control. A cooling water circulating operation is also known. However, even in this case, there is a case where cooling water is supplied to the air-conditioning cooling water circuit more than necessary, and the power consumed by the electric water pump is wasted.

  The inventor of the present invention has a situation where it is possible to sufficiently satisfy the air conditioning requirement (heating requirement) even if the flow rate of the cooling water in the air conditioning cooling water circuit is low. Focusing on the fact that the flow rate has increased, the present invention has been achieved.

  The present invention has been made in view of the above points, and an object of the present invention is to reduce power consumption of an electric water pump for flowing cooling water to a cooling water circuit for air conditioning in an automobile that performs idling stop control. Another object of the present invention is to provide an electric water pump control device for an automobile that can be used, and an air conditioning system for an automobile equipped with the control device.

-Solving principle-
The solution principle of the present invention devised in order to achieve the above object is that the electric water pump driven to flow the cooling water through the cooling water circuit for air conditioning is the minimum necessary to meet the air conditioning requirements. The electric water pump drive state (the number of revolutions, etc.) is controlled so that the cooling water flow rate can be obtained in the cooling water circuit for air conditioning.

-Solution-
Specifically, the present invention is mounted on an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, and is branched from the cooling water circulation circuit of the internal combustion engine. It is premised on a control device that controls an electric water pump that is a driving source for flowing cooling water through the cooling water circuit for air conditioning. The electric water pump control device is provided with a cooling water temperature detecting means and an electric water pump control means. The cooling water temperature detecting means detects the temperature of the cooling water flowing through the air conditioning cooling water circuit or the temperature of the cooling water introduced into the air conditioning cooling water circuit. The electric water pump control means outputs the output of the cooling water temperature detecting means when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, heating request) is made in the passenger compartment. In response, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be lower as the temperature of the cooling water is higher.

  This configuration includes a mechanical water pump that operates in response to the driving force of the internal combustion engine, and an electric motor that operates to flow cooling water through the cooling water circuit for air conditioning when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control. Not only a system equipped with both a water pump (hereinafter referred to as a “double water pump system”) but also a mechanical water pump that operates by receiving the driving force of the internal combustion engine is eliminated. This is a concept including a system (hereinafter, referred to as “single water pump system”) in which cooling water circulation for cooling the internal combustion engine and cooling water circulation operation in the cooling water circuit for air conditioning are performed.

  Due to this specific matter, when there is an air conditioning request (for example, a heating request) in a state where a predetermined internal combustion engine automatic stop condition is satisfied, an air conditioning capability ( Heating capacity) will be maintained. In this case, the electric water pump control means sets the flow rate of the cooling water flowing through the air conditioning cooling water circuit as the temperature of the cooling water flowing through the air conditioning cooling water circuit is higher. That is, when the temperature of the cooling water is relatively high, the amount of heat per unit volume of the cooling water is large, so that a sufficient air conditioning capability can be ensured even if the flow rate of the cooling water in the air conditioning cooling water circuit is small. As a result, the necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, when the temperature of the cooling water is relatively low, the amount of heat per unit volume of the cooling water is small, so sufficient air conditioning capacity (heating capacity) is ensured unless the cooling water flow rate in the cooling water circuit for air conditioning is increased. You may not be able to. For this reason, the flow rate of the cooling water in the cooling water circuit for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in this solution, when the temperature of the cooling water is relatively high, the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be small while ensuring sufficient air conditioning capability in any situation. Thus, the drive of the electric water pump is controlled (the output is reduced) so that the power consumed by the electric water pump can be reduced. For this reason, the waste of electric power by the electric water pump is eliminated, and the situation in which the amount of power stored in the battery is reduced is suppressed, so that many opportunities to stop the engine by the “internal combustion engine automatic stop control (idling stop control)” are obtained. be able to. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

  Further, as another solution, when a predetermined internal combustion engine automatic stop condition is established, the vehicle is mounted on an automobile that performs internal combustion engine automatic stop control for stopping the drive of the internal combustion engine, and receives the driving force of the internal combustion engine and A mechanical water pump serving as a driving source for flowing cooling water to the cooling water circulation circuit of the internal combustion engine and a driving source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine An electric water pump, and when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump, while the internal combustion engine is stopped by the internal combustion engine automatic stop control, and the air conditioning request in the passenger compartment is met. When the electric water pump is used, the electric water pump of the air conditioning system for automobiles configured to distribute the cooling water to the air conditioning cooling water circuit by driving the electric water pump. The loop control system is assumed. The electric water pump control device is provided with a cooling water temperature detecting means and an electric water pump control means. The cooling water temperature detecting means detects the temperature of the cooling water flowing through the air conditioning cooling water circuit or the temperature of the cooling water introduced into the air conditioning cooling water circuit. The electric water pump control means outputs the output of the cooling water temperature detecting means when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, heating request) is made in the passenger compartment. In response, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be lower as the temperature of the cooling water is higher.

  In the case of this specific matter, when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump. In other words, when there is an air conditioning request (for example, a heating request) in the passenger compartment, a part of the cooling water discharged by the mechanical water pump flows through the cooling water circuit for air conditioning, and the air conditioning operation using the heat quantity is performed. Is called. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and there is a request for air conditioning in the passenger compartment, the electric water pump is started. By starting this electric water pump, the cooling water flows through the cooling water circuit for air conditioning, and the air conditioning operation using the amount of heat is performed. Even in this solution, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set lower as the temperature of the cooling water flowing through the air conditioning cooling water circuit is higher. Yes. For this reason, as in the case described above, when the temperature of the cooling water is relatively high while ensuring sufficient air conditioning capability, the electric motor is set so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be small. The power consumed by the electric water pump can be reduced by controlling the driving of the water pump (lowering the output). For this reason, the waste of electric power by the electric water pump is eliminated, and the situation in which the amount of power stored in the battery is reduced can be suppressed, so that many opportunities to stop the engine by the “internal combustion engine automatic stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

  As another means for achieving the above object, the following configuration can be cited as a means for controlling the driving of the electric water pump in accordance with the amount of air blown toward the passenger compartment.

  When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. A control device that controls an electric water pump that is a drive source for flowing water is assumed. The electric water pump control device is provided with an air flow detecting means and an electric water pump control means. The air flow detection means detects the air flow toward the vehicle interior. Further, the electric water pump control means outputs the output of the air flow rate detection means when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, a heating request) is made in the passenger compartment. In response, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be smaller as the amount of air blown toward the passenger compartment is smaller.

  This configuration is also a concept including not only the double water pump system but also a single water pump system.

  Due to this specific matter, when there is an air conditioning request (for example, a heating request) in a state where a predetermined internal combustion engine automatic stop condition is satisfied, an air conditioning capability ( Heating capacity) is maintained. In this case, the electric water pump control means sets the flow rate of the cooling water flowing through the air conditioning cooling water circuit to be smaller as the amount of air blown toward the vehicle interior is smaller. That is, when the air flow rate is relatively small, the amount of heat taken from the cooling water per unit time is small, so that sufficient air conditioning capability can be ensured even if the cooling water flow rate in the air conditioning cooling water circuit is small. As a result, the necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, if the amount of air blown is relatively large, the amount of heat taken from the cooling water per unit time is large, so sufficient air conditioning capacity (heating capacity) must be ensured unless the flow rate of cooling water in the cooling water circuit for air conditioning is increased. May not be possible. For this reason, the flow rate of the cooling water in the cooling water circuit for air conditioning is increased so that sufficient air conditioning capability is obtained. Thus, in this solution, while ensuring sufficient air conditioning capability in any situation, when the air flow rate is relatively small, the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be small. In addition, the electric water pump is controlled to drive (lowering the output) to reduce the electric power consumed by the electric water pump. For this reason, the waste of electric power by the electric water pump is eliminated, and the situation in which the amount of power stored in the battery is reduced can be suppressed, so that many opportunities to stop the engine by the “internal combustion engine automatic stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

  Further, as another solution, when a predetermined internal combustion engine automatic stop condition is established, the vehicle is mounted on an automobile that performs internal combustion engine automatic stop control for stopping the drive of the internal combustion engine, and receives the driving force of the internal combustion engine and A mechanical water pump serving as a driving source for flowing cooling water to the cooling water circulation circuit of the internal combustion engine and a driving source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine An electric water pump, and when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump, while the internal combustion engine is stopped by the internal combustion engine automatic stop control, and the air conditioning request in the passenger compartment is met. When the electric water pump is used, the electric water pump of the air conditioning system for automobiles configured to distribute the cooling water to the air conditioning cooling water circuit by driving the electric water pump. The loop control system is assumed. The electric water pump control device is provided with an air flow detecting means and an electric water pump control means. The air flow detection means detects the air flow toward the vehicle interior. Further, the electric water pump control means outputs the output of the air flow rate detection means when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, a heating request) is made in the passenger compartment. In response, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be smaller as the amount of air blown toward the passenger compartment is smaller.

  In the case of this specific matter, when the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and there is a request for air conditioning in the passenger compartment, the cooling water flows through the cooling water circuit for air conditioning by starting the electric water pump, Air-conditioning operation using the amount of heat is performed. And even if it exists in this solution means, the drive of an electric water pump is controlled so that the flow volume of the cooling water which flows through the cooling-water circuit for an air conditioning is set so that it is small, and there are few ventilation | air_flowings toward a vehicle interior. For this reason, as in the case described above, the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to a small value when the air flow rate toward the passenger compartment is relatively small while ensuring sufficient air conditioning capability. Thus, the drive of the electric water pump is controlled (the output is lowered), and the power consumed by the electric water pump can be reduced. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  As another means for achieving the above object, there is the following configuration for controlling the driving of the electric water pump in accordance with the air temperature (heater core intake air temperature) before heat exchange.

  When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. A control device that controls an electric water pump that is a drive source for flowing water is assumed. The electric water pump control device is provided with primary air temperature detection means and electric water pump control means. The primary air temperature detecting means detects a primary air temperature that is a temperature before heat exchange of the air that exchanges heat with the cooling water flowing through the cooling water circuit for air conditioning. The electric water pump control means is configured to detect the primary air temperature when the driving of the internal combustion engine is stopped by the automatic stop control of the internal combustion engine and an air conditioning request (for example, a heating request) is made in the passenger compartment. And the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be smaller as the primary air temperature is higher.

  This configuration is also a concept including not only the double water pump system but also a single water pump system.

  Due to this specific matter, when there is an air conditioning request (for example, a heating request) in a state where a predetermined internal combustion engine automatic stop condition is satisfied, an air conditioning capability ( Heating capacity) is maintained. In this case, the electric water pump control means sets the flow rate of the cooling water flowing through the air conditioning cooling water circuit as the primary air temperature is higher. That is, when the primary air temperature is relatively high, the amount of heat required for cooling water per unit time is small, so that sufficient air conditioning capability is ensured even if the cooling water flow rate in the air conditioning cooling water circuit is small. Can do. As a result, the necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, when the primary side air temperature is relatively low, the amount of heat required for cooling water per unit time is large, so sufficient air conditioning capacity (heating capacity) is required unless the flow rate of cooling water in the cooling water circuit for air conditioning is increased. May not be able to be secured. For this reason, the flow rate of the cooling water in the cooling water circuit for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in the present solution, the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is reduced when the primary side air temperature is relatively high while ensuring sufficient air conditioning capability in any situation. The drive of the electric water pump is controlled so as to be set (the output is lowered) to reduce the power consumed by the electric water pump. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  Further, as another solution, when a predetermined internal combustion engine automatic stop condition is established, the vehicle is mounted on an automobile that performs internal combustion engine automatic stop control for stopping the drive of the internal combustion engine, and receives the driving force of the internal combustion engine and A mechanical water pump serving as a driving source for flowing cooling water to the cooling water circulation circuit of the internal combustion engine and a driving source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine An electric water pump, and when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump, while the internal combustion engine is stopped by the internal combustion engine automatic stop control, and the air conditioning request in the passenger compartment is met. When the electric water pump is used, the electric water pump of the air conditioning system for automobiles configured to distribute the cooling water to the air conditioning cooling water circuit by driving the electric water pump. The loop control system is assumed. The electric water pump control device is provided with primary air temperature detection means and electric water pump control means. The primary air temperature detecting means detects a primary air temperature that is a temperature before heat exchange of the air that exchanges heat with the cooling water flowing through the cooling water circuit for air conditioning. The electric water pump control means is configured to detect the primary air temperature when the driving of the internal combustion engine is stopped by the automatic stop control of the internal combustion engine and an air conditioning request (for example, a heating request) is made in the passenger compartment. And the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be smaller as the primary air temperature is higher.

  In the case of this specific matter, when the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and there is a request for air conditioning in the passenger compartment, the cooling water flows through the cooling water circuit for air conditioning by starting the electric water pump, Air-conditioning operation using the amount of heat is performed. Even in the present solution, the drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be smaller as the primary air temperature is higher. Therefore, as in the case described above, when the primary air temperature is relatively high while ensuring sufficient air conditioning capability, the flow rate of the cooling water flowing through the cooling water circuit for air conditioning should be set small. By controlling the driving of the electric water pump (lowering the output), the power consumed by the electric water pump can be reduced. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  As another means for achieving the above object, the following configuration is exemplified as a means for controlling the driving of the electric water pump in accordance with the difference between the air temperature before heat exchange (heater core intake air temperature) and the air conditioning target temperature. .

  When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. A control device that controls an electric water pump that is a drive source for flowing water is assumed. The electric water pump control device is provided with primary air temperature detection means and electric water pump control means. The primary air temperature detecting means detects a primary air temperature that is a temperature before heat exchange of the air that exchanges heat with the cooling water flowing through the cooling water circuit for air conditioning. The electric water pump control means is configured to detect the primary air temperature when the driving of the internal combustion engine is stopped by the automatic stop control of the internal combustion engine and an air conditioning request (for example, a heating request) is made in the passenger compartment. When the primary side air temperature is lower than the target temperature of the conditioned air, the target temperature of the conditioned air blown toward the vehicle interior is compared with the primary air temperature. The drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be smaller as the temperature difference between is smaller.

  This configuration is also a concept including not only the double water pump system but also a single water pump system.

  Due to this specific matter, when there is an air conditioning request (for example, a heating request) in a state where a predetermined internal combustion engine automatic stop condition is satisfied, an air conditioning capability ( Heating capacity) is maintained. In this case, when the primary air temperature is lower than the target temperature of the conditioned air, the electric water pump control means sets the flow rate of the cooling water flowing through the cooling water circuit for air conditioning as the temperature difference is smaller. To do. That is, when the temperature difference is relatively small, the amount of heat to be taken from the cooling water per unit time is small, so that a sufficient air conditioning capability can be ensured even if the cooling water flow rate in the air conditioning cooling water circuit is small. As a result, the necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, when the temperature difference is relatively large, the amount of heat to be taken from the cooling water per unit time is large. Therefore, sufficient air conditioning capacity (heating capacity) is ensured unless the flow rate of the cooling water in the cooling water circuit for air conditioning is increased. May not be possible. For this reason, the flow rate of the cooling water in the cooling water circuit for air conditioning is increased so that sufficient air conditioning capability is obtained. Thus, in this solution, while ensuring sufficient air conditioning capability in any situation, if the temperature difference is relatively small, the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set to be small. In addition, the electric water pump is controlled to drive (lowering the output) to reduce the electric power consumed by the electric water pump. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  Further, as another solution, when a predetermined internal combustion engine automatic stop condition is established, the vehicle is mounted on an automobile that performs internal combustion engine automatic stop control for stopping the drive of the internal combustion engine, and receives the driving force of the internal combustion engine and A mechanical water pump serving as a driving source for flowing cooling water to the cooling water circulation circuit of the internal combustion engine and a driving source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine An electric water pump, and when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump, while the internal combustion engine is stopped by the internal combustion engine automatic stop control, and the air conditioning request in the passenger compartment is met. When the electric water pump is used, the electric water pump of the air conditioning system for automobiles configured to distribute the cooling water to the air conditioning cooling water circuit by driving the electric water pump. The loop control system is assumed. The electric water pump control device is provided with primary air temperature detection means and electric water pump control means. The primary air temperature detecting means detects a primary air temperature that is a temperature before heat exchange of the air that exchanges heat with the cooling water flowing through the cooling water circuit for air conditioning. The electric water pump control means is configured to detect the primary air temperature when the driving of the internal combustion engine is stopped by the automatic stop control of the internal combustion engine and an air conditioning request (for example, a heating request) is made in the passenger compartment. When the primary side air temperature is lower than the target temperature of the conditioned air, the target temperature of the conditioned air blown toward the vehicle interior is compared with the primary air temperature. The drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be smaller as the temperature difference between is smaller.

  In the case of this specific matter, when the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and there is a request for air conditioning in the passenger compartment, the cooling water flows through the cooling water circuit for air conditioning by starting the electric water pump, Air-conditioning operation using the amount of heat is performed. And even if it exists in this solution means, when the said primary side air temperature is lower than the target temperature of an air-conditioning wind, the flow volume of the cooling water which flows through the cooling-water circuit for an air conditioning is so set small that these temperature differences are small. Thus, the drive of the electric water pump is controlled. For this reason, as in the case described above, when the temperature difference is relatively small while ensuring sufficient air conditioning capability, the electric water flow is set so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit is set small. By controlling the driving of the pump (lowering the output), it is possible to reduce the power consumed by the electric water pump. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  As another solution for achieving the above object, the following configuration is exemplified as one for controlling the driving of the electric water pump in accordance with the difference between the target temperature of the heat exchanger and the actual temperature of the heat exchanger. .

  When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. A control device that controls an electric water pump that is a drive source for flowing water is assumed. The electric water pump control device is provided with a heat exchanger temperature detecting means and an electric water pump control means. The heat exchanger temperature detection means detects the temperature of a heat exchanger (heater core) that performs heat exchange between the cooling water flowing through the air conditioning cooling water circuit and the air. In addition, the electric water pump control means is configured such that when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, a heating request) is made in the passenger compartment, the heat exchanger temperature detecting means The output is compared, the target value of the heat exchanger temperature is compared with the detected heat exchanger temperature, and the higher the detected heat exchanger temperature is, the higher the target value of the heat exchanger temperature, the cooling water circuit for air conditioning. The driving of the electric water pump is controlled so as to set the flow rate of the cooling water flowing through the small.

  This configuration is also a concept including not only the double water pump system but also a single water pump system.

  Due to this specific matter, when there is an air conditioning request (for example, a heating request) in a state where a predetermined internal combustion engine automatic stop condition is satisfied, an air conditioning capability ( Heating capacity) is maintained. In this case, the electric water pump control means sets the flow rate of the cooling water flowing through the air conditioning cooling water circuit as the detected heat exchanger temperature is higher than the target value of the heat exchanger temperature. In other words, when the detected heat exchanger temperature is relatively higher than the target value of the heat exchanger temperature, the heat exchanger has a sufficient amount of heat to obtain air conditioning performance. Even if the flow rate of the cooling water in the water circuit is small, sufficient air conditioning capability can be ensured. As a result, the necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, when the detected heat exchanger temperature is relatively lower than the target value of the heat exchanger temperature, the heat exchanger does not have enough heat to obtain air conditioning performance. If the flow rate of the cooling water in the water circuit is not increased, sufficient air conditioning capability (heating capability) may not be ensured. For this reason, the flow rate of the cooling water in the cooling water circuit for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in the present solution, when the detected heat exchanger temperature is relatively higher than the target value of the heat exchanger temperature while ensuring sufficient air conditioning capability in any situation, the air conditioning The drive of the electric water pump is controlled so that the flow rate of the cooling water flowing through the cooling water circuit is set to be small (the output is reduced), and the electric power consumed by the electric water pump is reduced. For this reason, it is possible to obtain many opportunities for engine stop by “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  Further, as another solution, when a predetermined internal combustion engine automatic stop condition is established, the vehicle is mounted on an automobile that performs internal combustion engine automatic stop control for stopping the drive of the internal combustion engine, and receives the driving force of the internal combustion engine and A mechanical water pump serving as a driving source for flowing cooling water to the cooling water circulation circuit of the internal combustion engine and a driving source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine An electric water pump, and when the internal combustion engine is driven, the cooling water is circulated by driving the mechanical water pump, while the internal combustion engine is stopped by the internal combustion engine automatic stop control, and the air conditioning request in the passenger compartment is met. When the electric water pump is used, the electric water pump of the air conditioning system for automobiles configured to distribute the cooling water to the air conditioning cooling water circuit by driving the electric water pump. The loop control system is assumed. The electric water pump control device is provided with a heat exchanger temperature detecting means and an electric water pump control means. The heat exchanger temperature detection means detects the temperature of a heat exchanger (heater core) that performs heat exchange between the cooling water flowing through the air conditioning cooling water circuit and the air. In addition, the electric water pump control means is configured such that when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request (for example, a heating request) is made in the passenger compartment, the heat exchanger temperature detecting means The output is compared, the target value of the heat exchanger temperature is compared with the detected heat exchanger temperature, and the higher the detected heat exchanger temperature is, the higher the target value of the heat exchanger temperature, the cooling water circuit for air conditioning. The driving of the electric water pump is controlled so as to set the flow rate of the cooling water flowing through the small.

  In the case of this specific matter, when the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and there is a request for air conditioning in the passenger compartment, the cooling water flows through the cooling water circuit for air conditioning by starting the electric water pump, Air-conditioning operation using the amount of heat is performed. And even if it exists in this solution means, electric water pump so that the flow volume of the cooling water which flows through the cooling water circuit for an air conditioning may be set small, so that the detected heat exchanger temperature is higher than the target value of heat exchanger temperature The drive is controlled. Therefore, as in the case described above, if the detected heat exchanger temperature is relatively higher than the target value of the heat exchanger temperature while ensuring sufficient air conditioning capability, the air conditioning cooling water circuit It is possible to control the drive of the electric water pump so as to set the flow rate of the cooling water flowing through (reducing the output) to reduce the electric power consumed by the electric water pump. For this reason, it is possible to obtain many opportunities to stop the engine by the “internal combustion engine automatic stop control”, and it is possible to improve the fuel consumption rate and suppress the exhaust gas emission amount.

  Further, an automotive air conditioning system including any one of the above-described solving means and an electric water pump control device is also within the scope of the technical idea of the present invention. That is, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the air conditioning in the passenger compartment is requested, the cooling that flows through the cooling water circuit for air conditioning by controlling the driving of the electric water pump as described above. An automotive air conditioning system configured to adjust the flow rate of water.

  In the present invention, as an electric water pump that is driven to flow cooling water through the air conditioning cooling water circuit, the electric water pump is electrically operated so that a minimum required cooling water flow rate that can meet the air conditioning requirements is obtained in the air conditioning cooling water circuit. The driving state of the water pump is controlled. For this reason, waste of electric power due to this electric water pump is eliminated, and it is possible to obtain many opportunities for engine stop by “internal combustion engine automatic stop control” by suppressing the situation where the amount of power stored in the battery decreases. it can. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the case where a mechanical water pump and an electric water pump are provided as a water pump with which an engine cooling system is equipped. Before describing a plurality of embodiments relating to output control of the electric water pump, the circuit configuration of the engine cooling system and the cooling water circulation operation in the cooling system will be described. Further, since the vehicle according to the present embodiment performs idling stop control (internal combustion engine automatic stop control), the idling stop control will also be described.

  FIG. 1 is a schematic diagram illustrating a circuit configuration of a cooling system of the engine E according to the present embodiment. As shown in FIG. 1, the cooling system of the engine E according to the present embodiment includes a cooling water circulation circuit A through which cooling water for engine cooling flows, and a branching from the cooling water circulation circuit A, for air conditioning in a vehicle interior. A cooling water circuit B for air conditioning for flowing cooling water as a heat source (for example, a heat source for heating the vehicle interior) is provided. Hereinafter, the circuits A and B will be described.

-Cooling water circuit A-
The cooling water circulation circuit A includes a radiator 1, a thermostat 2, a first water pump 3 composed of a mechanical water pump, pipes for connecting these devices 1, 2, 3 and hoses H1, H2, H3, H4. Yes.

  Specifically, the lower tank 11 and the thermostat 2 of the radiator 1 are connected by a lower hose H1, and the discharge port of the first water pump 3 communicates with a water jacket (not shown) formed in the engine E. In this water jacket, the cooling water (heat recovery medium) from the first water pump 3 passes through the water jacket on the cylinder block side, is introduced into the water jacket on the cylinder head side, and is then taken out from the engine E by the take-out pipe H2. It is. The take-out pipe H2 is branched, one is connected to the upper tank 12 of the radiator 1 by an upper hose H3, and the other is connected to the thermostat 2 by a bypass pipe H4.

  Hereinafter, the configuration and function of each device provided in the cooling water circulation circuit A will be briefly described.

  The radiator 1 is of a down flow type, and a radiator core 13 is provided between the upper tank 12 and the lower tank 11. A cooling fan 14 is disposed in the vicinity of the radiator 1. The cooling fan 14 is constituted by an electric axial fan driven by an electric motor 14a.

  As a result, when the cooling water recovered from the engine E through the take-out pipe H2 and the upper hose H3 flows down into the radiator core 13 toward the lower tank 11, the outside air (air flow by driving air and driving of the cooling fan 14) is generated. The cooling water is cooled by exchanging heat with the air and radiating heat to the outside air.

  In addition, a radiator cap (not shown) is detachably attached to the upper tank 12. The radiator cap has a function of increasing the boiling point of the cooling water and increasing the heat exchange efficiency in the radiator core 13 by maintaining the internal pressure of the cooling water circulation circuit A at atmospheric pressure or higher. Further, the radiator cap is removed from the upper tank 12 when water is poured into the cooling water circulation path or when air is released from the cooling water circulation path. As a result, the water inlet of the radiator 1 is opened and the cooling water circulation path communicates with the atmosphere.

  The thermostat 2 adjusts the temperature of the cooling water by switching the water path of the cooling water circulation circuit A. For example, the thermostat 2 utilizes the thermal expansion of wax sealed inside, and the valve provided in accordance with the cooling water temperature. It consists of a cooling water temperature responsive valve with a mechanism that opens and closes.

  When the engine E is cold, that is, when the cooling water temperature is relatively low, the valve of the thermostat 2 is closed to shut off the lower tank 11 of the radiator 1 and the first water pump 3, and The bypass pipe H4 side is opened, and the bypass pipe H4 and the first water pump 3 are communicated. That is, the warm-up performance can be improved by circulating the cooling water between the water jacket formed inside the engine E and the bypass pipe H4 (bypassing the radiator 1). On the other hand, after the warm-up of the engine E is completed, that is, when the cooling water temperature is relatively high, the valve of the thermostat 2 is opened, and the lower tank 11 of the radiator 1 and the first water pump 3 are communicated with each other. By flowing the cooling water, the heat recovered by the cooling water is released to the atmosphere by the radiator 1.

  The first water pump 3 is for generating a water flow in the cooling water circulation circuit A, and a transmission belt is hung between a water pump pulley 31 and a crankshaft pulley (not shown) provided on its drive shaft. By being passed, it is driven by the rotational force of the crankshaft.

-Cooling water circuit B for air conditioning-
Next, the cooling water circuit B for air conditioning branched from the cooling water circulation circuit A will be described.

  The air conditioning cooling water circuit B has an upstream end connected to the take-out pipe H2 and a downstream end connected to the suction side of the first water pump 3.

  The cooling water circuit B for air conditioning is provided with a second water pump 4 constituted by an electric water pump, a heater valve 5 whose opening degree can be adjusted, and a heater core (heat exchanger) 6. Are connected in series.

  The second water pump 4 is driven by an electric motor 4a, and the rotational speed (pump output) of the second water pump 4 is adjusted by controlling the rotational speed of the electric motor 4a. Thereby, the cooling water flow rate per unit time in the cooling water circuit B for air conditioning can be adjusted. In the present embodiment, the second water pump 4 is driven when there is an air conditioning request (such as a heating request) from the occupant when the first water pump 3 is stopped (such as when the engine E is stopped by idling stop control). It has come to be. Details of the control operation of the second water pump 4 will be described later.

  The heater valve 5 is an opening adjustment valve for controlling the flow of cooling water to the heater core 6. A valve body (not shown) of the heater valve 5 is driven to open and close by an electric actuator 5a such as a servo motor or an electromagnetic drive mechanism.

  The heater core 6 is a heating heat exchanger that heats the air for heating the vehicle interior using the heat of the cooling water, and faces the air conditioning duct 7 of the air conditioner.

  FIG. 2 shows the internal configuration of the air conditioning duct 7. As shown in FIG. 2, the heater core 6 heats the air blown by an air-conditioning blower 71 (hereinafter referred to as a blower) by heat exchange with cooling water. The heater core 6 is installed on the downstream side of the cooling evaporator 72 in the ventilation path in the air conditioning duct 7. For example, the cooling air cooled by the evaporator 72 is reheated to a predetermined temperature to blow out into the vehicle interior. Control air temperature. The blower 71 is constituted by an electric centrifugal fan driven by a motor 71a.

  In FIG. 2, 7 a is an air intake port through which air is sucked through an inside / outside air switching box (not shown), and 7 b is an air outlet that blows out the air whose temperature is adjusted by the heater core 6 into the vehicle interior. As this blower outlet 7b, a face blower outlet that blows air toward the passenger's head, a foot blower outlet that blows air toward the passenger's feet, a defroster outlet that blows air toward the vehicle window glass, and the like are provided. Yes.

  In FIG. 1, reference numeral 81 denotes an air conditioning switch group provided on a control panel (not shown) of the automotive air conditioner, an air conditioning switch for starting an air conditioning compressor (not shown), and a temperature for setting a target temperature. It consists of a setting switch, a blow mode switch, a control switch for the blower 71, and the like. Reference numeral 82 denotes a sensor group for automatic control of an air conditioner for an automobile, which includes an inside air temperature sensor that detects the temperature inside the vehicle, an outside air temperature sensor that detects the outside air temperature, a solar radiation sensor that detects the amount of solar radiation, and the cooling temperature of the evaporator 72. It includes an evaporator temperature sensor for detection.

  In the figure, reference numeral 83 denotes a water temperature sensor for detecting the cooling water temperature at the cooling water outlet portion of the engine E, and is composed of a temperature sensitive resistance element such as a thermistor. An ignition switch 84 supplies power to the ignition circuit of the engine E.

  Further, reference numeral 8 in the figure denotes an air conditioner ECU composed of a microcomputer and its peripheral circuits. The air conditioner ECU 8 determines input signals input from the air conditioning switch group 81, the sensor group 82, the water temperature sensor 83, the ignition switch 84, and the like according to a preset program, performs arithmetic processing, and displays the calculation processing result. Based on this, the operations of the blower 71, the heater valve 5, the second water pump 4 and the like are controlled.

  In the figure, 15 is a refrigerant condenser in the refrigeration cycle of the air conditioning system for automobiles, which is installed on the air upstream side (vehicle front side) of the radiator 1 and is cooled by the common cooling fan 14 together with the radiator 1.

−Cooling water circulation operation−
Next, the cooling water circulation operation will be described.

  First, when the engine is cold, such as at the initial start of the engine, the valve of the thermostat 2 is closed, and the first water pump 3, the water jacket inside the engine E, the take-out pipe H2, the bypass pipe H4, and the thermostat 2 are cooled in this order. A circulation operation in which water flows is performed (see the arrow indicated by a broken line in FIG. 1). As a result, a relatively small amount of cooling water is circulated bypassing the radiator 1, and the heat dissipation operation in the radiator 1 is not performed, so that the warm-up of the engine E is completed early. In this case, the heater valve 5 is closed because the cooling water temperature is low and the heating request cannot be met. The second water pump 4 is stopped.

  On the other hand, after the engine warm-up is completed, the valve of the thermostat 2 is opened, and the radiator 1, the lower hose H1, the thermostat 2, the first water pump 3, the water jacket inside the engine E, the take-out pipe H2, and the upper hose H3 are cooled in this order. Water flows (see arrows shown by solid lines in FIG. 1). The cooling water returned from the upper hose H3 to the radiator 1 is cooled by being released into the atmosphere by the radiator core 13.

  Further, after completion of such warm-up, if an occupant's air conditioning request (heating request or the like) is generated by operating the air conditioning switch group 81, the air conditioning cooling water circuit B is provided. The heater valve 5 is opened, and a part of the cooling water taken out from the engine E by the take-out pipe H2 flows into the air-conditioning cooling water circuit B (see an arrow indicated by a one-dot chain line in FIG. 1). Further, the blower 71 is activated and air is caused to flow through the air conditioning duct 7. As a result, heat is exchanged between the cooling water and the air in the heater core 6, and this air is heated and supplied as warm air at a predetermined temperature from the air outlet 7 b of the air-conditioning duct 7 to the vehicle interior. Is done. In addition, the amount of heat given from the cooling water to the air is adjusted by adjusting the opening of the heater valve 5. In this case, since the engine E is driven and the first water pump 3 that receives the driving force can introduce cooling water into the air conditioning cooling water circuit B, the second water pump 4 The stopped state is maintained.

-Idling stop control-
The automobile according to the present embodiment stops the ignition operation (ignition cut) of the ignition plug 92 provided in each cylinder of the engine E when the vehicle is temporarily stopped, such as waiting for a signal at an intersection, and the injector. The so-called idling stop control for stopping the engine E by stopping the fuel supply from the fuel supply 93 (fuel cut) is performed. Hereinafter, the idling stop control will be described.

  As shown in FIG. 1, an idle stop controller 91 for performing idling stop control is connected to an engine ECU 9 that controls the operating state of the engine E. The idle stop controller 91 transmits an ignition cut signal and a fuel cut signal to the engine ECU 9 when an idling stop condition (internal combustion engine automatic stop condition) is satisfied. On the other hand, when the engine start condition (idling stop release condition) is satisfied, the idle stop controller 91 transmits an ignition cut release signal and a fuel cut release signal to the engine ECU 9 and simultaneously sends a start control signal to a starter (not shown). It is supposed to send.

  The idle stop controller 91 receives a vehicle speed detection signal from the vehicle speed sensor 94, a shift position signal from the shift lever position sensor 95, a brake pedal depression signal and a brake pedal depression release signal from the brake pedal sensor 96. It is like that.

  The idle stop controller 91 receives an engine speed signal NE detected by a crank angle sensor (not shown) from the engine ECU 9.

  The idling stop condition of the automobile according to the present embodiment is that the ignition speed is ON, for example, the vehicle speed detection signal from the vehicle speed sensor 94 detects that the vehicle speed is “0”, and the brake pedal from the brake pedal sensor 96 This is established when it is detected that the brake pedal is depressed by the depression signal. When the idling stop condition is satisfied, the idle stop controller 91 transmits an ignition cut signal and a fuel cut signal to the engine ECU 9. Further, along with the transmission of the ignition cut signal and the fuel cut signal, the engine ECU 9 performs control to stop the ignition operation of the spark plug 92 and performs control to stop the fuel injection operation of the injector 93 to Stop.

  On the other hand, the engine start condition for starting the engine E from the state where the engine E is stopped by the idling stop control is determined by the brake pedal depression release signal from the brake pedal sensor 96 after the idling stop condition is satisfied. It is detected that the pedal depressing operation has been performed, or the shift lever is in either the “N (neutral)” position or the “P (parking)” position based on the shift position signal from the shift lever position sensor 95. To the travel range position ("D (drive)" position, "1 (first speed)" position, "2 (second speed)" position, "R (reverse)" position) It is established when it is detected that an operation has been performed. When this engine start condition is satisfied, the idle stop controller 91 transmits an ignition cut cancel signal and a fuel cut cancel signal to the engine ECU 9 and simultaneously transmits a start control signal to the starter. Upon receiving the ignition cut cancellation signal and the fuel cut cancellation signal, the engine ECU 9 performs control for starting the ignition operation of the spark plug 92 and starting the fuel injection operation of the injector 93. Further, the starter motor of the starter is operated by the start control signal, and the cranking of the engine E is performed.

  And in this embodiment, when the passenger | crew is request | requiring the air conditioning (heating etc.) of a vehicle interior, when the said idling stop condition is satisfied and the engine E stops, the said 2nd water pump 4 is started. It is like that. The reason is that when the engine E is stopped by the idling stop control, the first water pump (mechanical water pump) 3 is also stopped, and the cooling water is not supplied to the cooling water circuit B for air conditioning. It may be difficult to meet the air conditioning requirements of passengers. For this reason, in such a situation, the second water pump (electric water pump) 4 is operated to enable the supply of cooling water to the air conditioning cooling water circuit B, thereby maintaining the air conditioning capability. Yes.

  The feature of the present embodiment lies in the output control of the second water pump 4 during the operation of the second water pump 4 accompanying the stop of the engine E by the idling stop control. Hereinafter, a plurality of embodiments relating to output control of the second water pump 4 will be described.

(First embodiment)
First, as the output control of the second water pump 4 accompanying the stop of the engine E by the idling stop control, a first embodiment that performs control based on the coolant temperature will be described. In this control, the higher the temperature of the cooling water flowing through the air conditioning cooling water circuit B, the lower the rotation speed of the second water pump 4 (control operation by the electric water pump control means), and the air conditioning cooling water circuit B. The flow rate of the cooling water flowing through is set to be small.

  Hereinafter, an output control procedure of the second water pump 4 will be described with reference to the flowchart shown in FIG. In the flowchart shown in FIG. 3, steps ST1 to ST6 and 9 are steps related to the idling stop control, and steps ST7, 8, and 10 to ST12 are the features of the second water pump 4 that characterizes the present embodiment. This is a step related to output control.

  In a state where the engine is driven, first, in step ST1, it is determined whether or not the cooling water temperature tw detected by the water temperature sensor 83 exceeds a predetermined warm-up completion temperature TW1 (for example, 65 ° C.). . This is because, in a situation where the warm-up operation of the engine E has not been completed, sufficient air conditioning performance cannot be obtained. Therefore, the idling stop of the engine E is prohibited until the warm-up operation is completed (step ST4 described later). ), Determination for achieving a state where air conditioning performance can be obtained early.

  If it is determined in step ST1 that the coolant temperature tw exceeds the warm-up completion temperature TW1 and the determination is YES, the process proceeds to step ST2 to allow idling stop control. That is, when the idling stop condition is satisfied, the engine E is allowed to be stopped by the idling stop control.

  On the other hand, if it is determined in step ST1 that the cooling water temperature tw is equal to or lower than the warm-up completion temperature TW1 and NO, the process proceeds to step ST3 and the cooling water temperature tw detected by the water temperature sensor 83 is determined. Is determined to be equal to or lower than a predetermined idling stop prohibiting temperature TW2 (a temperature lower than the warm-up completion temperature TW1 and, for example, 50 ° C.). Even if the cooling water temperature tw exceeds the warm-up completion temperature TW1 and the warm-up operation is completed, there is a possibility that sufficient air-conditioning performance cannot be obtained if the cooling water temperature tw is subsequently lowered. Therefore, when the cooling water temperature tw is lowered to the idling stop prohibiting temperature TW2 or lower, the idling stop of the engine E is prohibited (step ST4 to be described later), and the determination is performed to obtain the air conditioning performance. .

  If it is determined in step ST3 that the coolant temperature tw is equal to or lower than the idling stop prohibiting temperature TW2 and the determination is YES, the process proceeds to step ST4, and idling stop control is prohibited. That is, even if the idling stop condition is satisfied, the engine E is not stopped by the idling stop control.

  Thus, in step ST1 to step ST4, the idling stop control is permitted while the cooling water temperature tw has a hysteresis between the idling stop prohibiting temperature TW2 (50 ° C.) and the warm-up completion temperature TW1 (65 ° C.). Switching between idling stop control and prohibition is made. That is, when the cooling water temperature tw rises and reaches the warm-up completion temperature TW1, the state is switched from the state in which the idling stop control is prohibited to the state in which the idling stop control is permitted. As long as the cooling water temperature tw does not fall to the idling stop prohibiting temperature TW2, it is prevented from switching to the state in which the idling stop control is prohibited, thereby preventing the occurrence of hunting between the permitting state and the prohibiting state. If NO is determined in step ST3, that is, the cooling water temperature tw is a temperature (for example, 55 ° C.) between the idling stop prohibiting temperature TW 2 (50 ° C.) and the warm-up completion temperature TW 1 (65 ° C.). In some cases, the current state (a state where idling stop control is prohibited or a state where idling stop control is permitted) is maintained.

  In step ST5, it is determined whether or not the idling stop condition is satisfied. If YES in step ST6, the current idling stop control state is determined in step ST6. It is determined whether or not the control is permitted, that is, whether or not the idling stop control is permitted in step ST2. Here, when it determines with YES which is the state where idling stop control was permitted, it moves to step ST7 and the said 2nd water pump (electric water pump) 4 is started. That is, since the engine E is stopped when the idling stop condition is satisfied in the state where the idling stop control is permitted, the second water pump 4 is started, and thereby the cooling water to the cooling water circuit B for air conditioning is started. To be able to distribute. At this time, the heater valve 5 is fully opened or fixed at a relatively large opening.

  On the other hand, if it is determined in step ST5 that the idling stop condition is not satisfied, the second water pump 4 is stopped in step ST8. That is, since the idling stop condition is not satisfied, the engine E is not stopped, and the cooling water can be circulated to the cooling water circuit B for air conditioning by driving the first water pump 3. 2 Stop the water pump 4.

  Furthermore, when it is determined in step ST6 that the current idling stop control state is NO, which is a state in which the control is prohibited, the process proceeds to step ST9 and the engine E is currently stopped by the idling stop control. In this case, the engine E is started, and the second water pump 4 is stopped in step ST8.

  When the second water pump 4 is activated in step ST7, the electric water pump that controls the rotational speed of the second water pump 4 in accordance with the temperature of the cooling water flowing through the cooling water circuit B for air conditioning. Move on to control action. First, in step ST10, the temperature of the cooling water flowing through the cooling water circuit B for air conditioning is detected. As a configuration for detecting this temperature (cooling water temperature detecting means), the water temperature sensor 83 may be used, or a water temperature sensor is provided upstream of the heater core 6 in the cooling water circuit B for air conditioning. The coolant temperature may be detected by this water temperature sensor.

  Thereafter, the process proceeds to step ST11, and the required coolant flow rate in the air conditioning coolant circuit B is calculated based on the detected coolant temperature. The required cooling water flow rate is set such that the flow rate of the cooling water flowing through the air conditioning cooling water circuit B decreases as the temperature of the cooling water flowing through the air conditioning cooling water circuit B increases. The required cooling water flow rate may be obtained by calculation, or a required cooling water flow rate setting map is stored in the ROM of the air conditioner ECU 8, and the required cooling water flow rate is set based on this map. Also good. FIG. 4 shows an example of the necessary cooling water flow rate setting map.

  After calculating the required cooling water flow rate in the cooling water circuit B for air conditioning in this way, the process proceeds to step ST12, and the rotational speed of the second water pump 4 is controlled so as to obtain this required cooling water flow rate. For example, the required cooling water flow rate is obtained by current control or voltage control of the second water pump 4.

  In this way, the second water pump 4 is controlled based on the temperature of the cooling water flowing through the air-conditioning cooling water circuit B, and the cooling water is allowed to flow by the required cooling water flow rate in the air-conditioning cooling water circuit B. That is, when the temperature of the cooling water is relatively high, the amount of heat per unit volume of the cooling water is large, so that sufficient air conditioning capability can be ensured even if the flow rate of the cooling water in the cooling water circuit B for air conditioning is small. . For this reason, necessary and sufficient air-conditioning capability is obtained with the minimum required flow rate of cooling water. On the other hand, when the temperature of the cooling water is relatively low, since the amount of heat per unit volume of the cooling water is small, sufficient air conditioning capacity (heating capacity) is required unless the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased. There is a possibility that it cannot be secured. For this reason, the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased so that sufficient air conditioning capability is obtained. Thus, in this embodiment, while ensuring sufficient air conditioning capability in any situation, when the temperature of the cooling water is relatively high, the flow rate of the cooling water flowing through the air conditioning cooling water circuit B is set to be small. Thus, the drive of the second water pump (electric water pump) 4 is controlled (the output is reduced) so that the power consumed by the second water pump 4 can be reduced. For this reason, the waste of the electric power by the 2nd water pump 4 is eliminated, and the situation where the amount of storage of the battery is reduced can be suppressed, so that many opportunities for stopping the engine by the “idling stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

(Second Embodiment)
Next, a description will be given of a second embodiment in which control is performed based on the air flow rate of the blower 71 (the air flow rate toward the vehicle interior) as output control of the second water pump 4 accompanying the stop of the engine E by idling stop control. To do. In this control, the lower the amount of air flow toward the vehicle interior, the lower the rotation speed of the second water pump 4 is set, and the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning is set lower. It is.

  Hereinafter, the procedure of the output control of the second water pump 4 will be described along the flowchart shown in FIG. In the flowchart shown in FIG. 5, the operations of step ST1 to step ST9 are the same as the operations of step ST1 to step ST9 in the first embodiment, and thus the description thereof is omitted here.

  In step ST7, when the second water pump 4 is started as the engine E is stopped, the rotational speed of the second water pump 4 is set in accordance with the air flow rate of the blower 71 (the rotational speed of the blower 71). Control moves to the electric water pump control operation. First, in step ST20, the blower volume of the blower 71 is detected. As a configuration for detecting the air flow (air flow detection means), an air flow sensor may be provided on the downstream side of the blower 71 inside the air conditioning duct 7, or the air conditioning switch group 81. You may make it obtain | require air volume from the operation position of a blower control switch.

  Thereafter, the process proceeds to step ST21, and the required cooling water flow rate in the air conditioning cooling water circuit B is calculated based on the detected blower amount of the blower 71. The required cooling water flow rate is set so that the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning decreases as the amount of air flow decreases. The required cooling water flow rate may be obtained by calculation, or a required cooling water flow rate setting map is stored in the ROM of the air conditioner ECU 8, and the required cooling water flow rate is set based on this map. Also good. FIG. 6 shows an example of the necessary cooling water flow rate setting map.

  After calculating the required cooling water flow rate in the cooling water circuit B for air conditioning in this way, the process proceeds to step ST22, and the rotational speed of the second water pump 4 is controlled so that this required cooling water flow rate is obtained.

  In this way, the second water pump 4 is controlled based on the blown air amount of the blower 71, and the cooling water is allowed to flow by the required cooling water flow rate in the air conditioning cooling water circuit B. That is, when the air flow rate is relatively small, the amount of heat taken from the cooling water per unit time is small, so that sufficient air conditioning capability can be ensured even if the cooling water flow rate in the air conditioning cooling water circuit B is small. Therefore, the necessary and sufficient air conditioning capacity can be obtained with the minimum required flow rate of cooling water. On the other hand, when the amount of air flow is relatively large, the amount of heat taken from the cooling water per unit time is large, so that sufficient air conditioning capability (heating capability) is ensured unless the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased. May not be possible. For this reason, the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in the present embodiment, the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning is set to be small when the air flow rate is relatively small while ensuring sufficient air conditioning capability in any situation. As described above, the drive of the second water pump (electric water pump) 4 is controlled (the output is reduced) so that the power consumed by the second water pump 4 can be reduced. For this reason, the waste of the electric power by the 2nd water pump 4 is eliminated, and the situation where the amount of storage of the battery is reduced can be suppressed, so that many opportunities for stopping the engine by the “idling stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

(Third embodiment)
Next, as the output control of the second water pump 4 accompanying the stop of the engine E by the idling stop control, the intake air temperature of the heater core 6 (the temperature of the air introduced into the heater core 6: hereinafter referred to as the primary air temperature). A third embodiment that performs control based on the above will be described. In this control, the rotational speed of the second water pump 4 is set lower as the primary air temperature is higher, and the flow rate of the cooling water flowing through the air conditioning cooling water circuit B is set lower.

  Hereinafter, the procedure of the output control of the second water pump 4 will be described along the flowchart shown in FIG. In the flowchart shown in FIG. 7, the operations from step ST1 to step ST9 are the same as the operations from step ST1 to step ST9 in the first embodiment, and a description thereof will be omitted here.

  When the second water pump 4 is activated in step ST7, the operation proceeds to an electric water pump control operation in which the rotational speed of the second water pump 4 is controlled in accordance with the primary air temperature. First, in step ST30, the intake temperature (the primary air temperature) of the heater core 6 is detected. As a configuration for detecting the primary side air temperature (primary side air temperature detecting means), a temperature sensor is provided on the upstream side of the heater core 6 inside the air conditioning duct 7.

  Thereafter, the process proceeds to step ST31, and the required cooling water flow rate in the cooling water circuit B for air conditioning is calculated based on the detected primary air temperature. The required cooling water flow rate is set so that the flow rate of the cooling water flowing through the air conditioning cooling water circuit B decreases as the primary air temperature increases. The required cooling water flow rate may be obtained by calculation, or a required cooling water flow rate setting map is stored in the ROM of the air conditioner ECU 8, and the required cooling water flow rate is set based on this map. Also good. FIG. 8 shows an example of the necessary coolant flow rate setting map.

  After calculating the required coolant flow rate in the cooling water circuit B for air conditioning in this way, the process proceeds to step ST32, and the rotation speed of the second water pump 4 is controlled so that the required coolant flow rate is obtained.

  In this way, the second water pump 4 is controlled based on the primary side air temperature, and the cooling water is allowed to flow by the necessary cooling water flow rate in the cooling water circuit B for air conditioning. That is, when the primary air temperature is relatively high, the amount of heat taken from the cooling water per unit time is small, so that sufficient air conditioning capability is ensured even if the cooling water flow rate in the air conditioning cooling water circuit B is small. Therefore, the necessary and sufficient air conditioning capacity can be obtained with the minimum flow rate of the cooling water. On the other hand, when the primary side air temperature is relatively low, the amount of heat taken from the cooling water per unit time is large. Therefore, sufficient air conditioning capacity (heating capacity) is required unless the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased. May not be able to be secured. For this reason, the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased so that sufficient air conditioning capability is obtained. Thus, in the present embodiment, the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning is reduced when the primary air temperature is relatively high while ensuring sufficient air conditioning capability in any situation. The drive of the second water pump (electric water pump) 4 is controlled so as to be set small (by reducing the output) so that the power consumed by the second water pump 4 can be reduced. Yes. For this reason, the waste of the electric power by the 2nd water pump 4 is eliminated, and the situation where the amount of storage of the battery is reduced can be suppressed, so that many opportunities for stopping the engine by the “idling stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

(Fourth embodiment)
Next, as the output control of the second water pump 4 accompanying the stop of the engine E by the idling stop control, the target temperature of the conditioned air blown toward the vehicle interior and the primary air temperature (introduced into the heater core 6). A fourth embodiment in which control is performed based on the difference from the air temperature) will be described. This control is performed when the primary air temperature is lower than the target temperature of the conditioned air. The smaller the temperature difference is, the lower the rotational speed of the second water pump 4 is set. The flow rate of the cooling water flowing through B is set to be small.

  Hereinafter, the procedure of output control of the second water pump 4 will be described with reference to the flowchart shown in FIG. In the flowchart shown in FIG. 9, the operations of step ST1 to step ST9 are the same as the operations of step ST1 to step ST9 in the first embodiment, and thus description thereof is omitted here.

  When the second water pump 4 is started in step ST7, the electric water pump that controls the rotational speed of the second water pump 4 according to the difference between the primary air temperature and the target temperature of the conditioned air. Move on to control action. First, in step ST40, the target temperature of the conditioned air (air conditioned air set temperature To) is detected. The configuration for detecting the target temperature (To) is obtained from the operation position of the temperature setting switch of the air conditioning switch group 81. In step ST41, the primary air temperature (the intake air temperature Ti of the heater core 6) is detected. As a configuration for detecting the primary air temperature (Ti) (primary air temperature detecting means), a temperature sensor is provided on the upstream side of the heater core 6 inside the air conditioning duct 7.

  Thereafter, the process proceeds to step ST42, and the required coolant flow rate in the air conditioning cooling water circuit B is calculated based on the difference (Ti-To) between the detected primary air temperature and the target temperature of the conditioned air. The required cooling water flow rate is set such that the smaller the temperature difference is, the smaller the cooling water flow rate flowing through the air conditioning cooling water circuit B is. The required cooling water flow rate may be obtained by calculation, or a required cooling water flow rate setting map is stored in the ROM of the air conditioner ECU 8, and the required cooling water flow rate is set based on this map. Also good. FIG. 10 shows an example of the necessary cooling water flow rate setting map.

  After calculating the required cooling water flow rate in the cooling water circuit B for air conditioning in this way, the process proceeds to step ST43, and the rotation speed of the second water pump 4 is controlled so as to obtain this required cooling water flow rate.

  In this way, the second water pump 4 is controlled based on the primary side air temperature, and the cooling water is allowed to flow by the necessary cooling water flow rate in the cooling water circuit B for air conditioning. That is, when the temperature difference is relatively small, the amount of heat to be taken from the cooling water per unit time is small, so that sufficient air conditioning capability can be ensured even if the cooling water flow rate in the air conditioning cooling water circuit B is small. Therefore, the necessary and sufficient air conditioning capability is obtained with the minimum required flow rate of the cooling water. On the other hand, if the above temperature difference is relatively large, the amount of heat to be taken from the cooling water per unit time is large. Therefore, if the flow rate of cooling water in the cooling water circuit B for air conditioning is increased, sufficient air conditioning capacity (heating capacity) is ensured. You may not be able to. For this reason, the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in the present embodiment, the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning is set to be small when the temperature difference is relatively small while ensuring sufficient air conditioning capability in any situation. As described above, the drive of the second water pump (electric water pump) 4 is controlled (the output is reduced) so that the power consumed by the second water pump 4 can be reduced. For this reason, the waste of the electric power by the 2nd water pump 4 is eliminated, and the situation where the amount of storage of the battery is reduced can be suppressed, so that many opportunities for stopping the engine by the “idling stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

(Fifth embodiment)
Next, as the output control of the second water pump 4 accompanying the stop of the engine E by the idling stop control, the target temperature of the heater core 6 (hereinafter simply referred to as the heater core target temperature (tht)) and the detected temperature of the heater core 6 are detected. A fifth embodiment that performs control based on the difference from the actual heater core temperature (th) will be described. In this control, as the actual heater core temperature (th) is higher than the heater core target temperature (tht), the rotation speed of the second water pump 4 is set lower, and the flow rate of the cooling water flowing through the cooling water circuit B for air conditioning is reduced. It is something that is set.

  Hereinafter, the procedure of the output control of the second water pump 4 will be described along the flowchart shown in FIG. In the flowchart shown in FIG. 11, the operations in steps ST1 to ST9 are the same as the operations in steps ST1 to ST9 in the first embodiment, and thus the description thereof is omitted here.

  When the second water pump 4 is activated in the step ST7, the electric motor for controlling the rotational speed of the second water pump 4 according to the difference between the heater core target temperature (tht) and the actual heater core temperature (th). Move on to water pump control operation. First, in step ST50, the heater core target temperature (tht) is detected. As a configuration for detecting the heater core target temperature (tht), the operation position of the temperature setting switch of the air conditioning switch group 81 and the operation position of the control switch of the blower 71 are taken into consideration and obtained by a predetermined arithmetic expression. The method for obtaining the heater core target temperature (tht) is not limited to this. In step ST51, the actual heater core temperature (th) is detected. As a configuration (heat exchanger temperature detection means) for detecting the actual heater core temperature (th), a temperature sensor is attached to the heat exchange fin of the heater core 6.

  Thereafter, the process proceeds to step ST52 where the actual heater core temperature (th) is subtracted from the heater core target temperature (tht), and whether or not the value exceeds a predetermined value TH1 (for example, 2.5 deg), that is, the actual heater core temperature (th ) Is lower than the heater core target temperature (tht) by 2.5 deg or more. When this determination is YES, the process proceeds to step ST53 to increase the output of the second water pump (electric water pump) 4. That is, the coolant flow rate in the air conditioning coolant circuit B is increased.

  On the other hand, if the determination in step ST52 is NO, the process proceeds to step ST54, where the actual heater core temperature (th) is subtracted from the heater core target temperature (tht), and the value is a predetermined value TH2 (for example, -2.5 deg). ), That is, whether or not the actual heater core temperature (th) is higher than the heater core target temperature (tht) by more than 2.5 deg. When this determination is YES, the process proceeds to step ST55, and the output of the second water pump (electric water pump) 4 is decreased. That is, the cooling water flow rate in the air conditioning cooling water circuit B is decreased.

  As described above, the second water pump 4 is controlled based on the difference between the heater core target temperature (tht) and the actual heater core temperature (th), and the cooling water is allowed to flow only in the required cooling water flow rate in the cooling water circuit B for air conditioning. ing. That is, when the actual heater core temperature (th) is relatively higher than the heater core target temperature (tht), the heater core 6 has a sufficient amount of heat to obtain the air conditioning performance. Since a sufficient air conditioning capability can be ensured even if the flow rate of the cooling water is small, a necessary and sufficient air conditioning capability can be obtained with the minimum required flow rate of the cooling water. On the other hand, when the actual heater core temperature (th) is relatively lower than the heater core target temperature (tht), the heater core 6 does not have a sufficient amount of heat to obtain sufficient air conditioning performance. If the flow rate of the cooling water in the circuit B is not increased, sufficient air conditioning capability (heating capability) may not be ensured. For this reason, the flow rate of the cooling water in the cooling water circuit B for air conditioning is increased so that sufficient air conditioning capability is obtained. As described above, in this embodiment, when the actual heater core temperature (th) is relatively higher than the heater core target temperature (tht) while ensuring sufficient air conditioning capability in any situation, the cooling water for air conditioning is used. The drive of the second water pump (electric water pump) 4 is controlled so that the flow rate of the cooling water flowing through the circuit B is set low (the output is lowered), and the power consumed by the second water pump 4 is reduced. We are trying to reduce it. For this reason, the waste of the electric power by the 2nd water pump 4 is eliminated, and the situation where the amount of storage of the battery is reduced can be suppressed, so that many opportunities for stopping the engine by the “idling stop control” can be obtained. As a result, it is possible to improve the fuel consumption rate and suppress the exhaust gas emission.

  In the present embodiment, a dead band (specifically ± 2.5 deg) is given to the value of the above calculation (tht-th) for switching between the case where the output of the second water pump 4 is increased and the case where it is decreased. ing. This prevents hunting of the control operation when the actual heater core temperature (th) is close to the heater core target temperature (tht). If the difference between the heater core target temperature (tht) and the actual heater core temperature (th) is in the dead zone, NO is determined in step ST54, and the current output of the second water pump 4 is determined. Will be maintained.

(Other embodiments)
In each of the embodiments described above, the mechanical water pump (first water pump 3) that operates by receiving the driving force of the engine E and the cooling water circuit B for air conditioning when the engine E is stopped by idling stop control. The case where this invention was applied to the system provided with both the electric water pump (2nd water pump 4) which operate | moves so that cooling water may be flowed was demonstrated. The present invention is not limited to this, and is not provided with a mechanical water pump that operates by receiving the driving force of the engine E. Cooling water circulation for cooling the engine and a cooling water circuit B for air conditioning by one electric water pump. The present invention is also applicable to a system in which the cooling water circulation operation is performed. In this case, when the engine E is stopped by the idling stop control, one electric water pump is continuously driven to perform the cooling water circulation operation in the cooling water circuit B for air conditioning. The driving state of the water pump is controlled as in the above-described embodiments.

  Further, the present invention provides a so-called hybrid vehicle that is equipped with an engine and an electric motor for traveling and travels by one or both of the driving forces, and when the engine is automatically stopped during traveling (electric motor for traveling). It can also be applied to electric water pump control when there is a request for air conditioning during traveling with only driving force or during regenerative operation.

It is the schematic which shows the circuit structure of the cooling system of the engine which concerns on embodiment. It is a figure which shows the internal structure of the duct for an air conditioning. It is a flowchart figure which shows the control procedure of the 2nd water pump in 1st Embodiment. It is a figure which shows an example of the required cooling water flow volume setting map in 1st Embodiment. It is a flowchart figure which shows the control procedure of the 2nd water pump in 2nd Embodiment. It is a figure which shows an example of the required cooling water flow volume setting map in 2nd Embodiment. It is a flowchart figure which shows the control procedure of the 2nd water pump in 3rd Embodiment. It is a figure which shows an example of the required cooling water flow volume setting map in 3rd Embodiment. It is a flowchart figure which shows the control procedure of the 2nd water pump in 4th Embodiment. It is a figure which shows an example of the required cooling water flow volume setting map in 4th Embodiment. It is a flowchart figure which shows the control procedure of the 2nd water pump in 5th Embodiment.

Explanation of symbols

3 1st water pump (mechanical water pump)
4 Second water pump (electric water pump)
6 Heater core (heat exchanger)
8 Air conditioner ECU
83 Water temperature sensor 9 Engine ECU
A Cooling water circulation circuit B Air conditioning cooling water circuit E Engine (internal combustion engine)

Claims (11)

When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. In a control device that controls an electric water pump that is a drive source for flowing water,
Cooling water temperature detecting means for detecting the temperature of the cooling water flowing through the air conditioning cooling water circuit or the temperature of the cooling water introduced into the air conditioning cooling water circuit;
When the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the air conditioning in the vehicle interior is requested, the cooling water temperature detecting means receives the output of the cooling water temperature detecting means, and the higher the cooling water temperature, An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling driving of the electric water pump so as to set a flow rate of cooling water flowing through the circuit to be small. Mounted in an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, receives the driving force of the internal combustion engine, and supplies the cooling water to the cooling water circulation circuit of the internal combustion engine An internal combustion engine comprising: a mechanical water pump serving as a drive source for flowing air; and an electric water pump serving as a drive source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine. When the engine is driven, the cooling water is circulated by driving the mechanical water pump. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the vehicle interior is requested to be air-conditioned, In the electric water pump control device for an automotive air conditioning system configured to circulate cooling water to the air conditioning cooling water circuit by driving the water pump,
Cooling water temperature detecting means for detecting the temperature of the cooling water flowing through the air conditioning cooling water circuit or the temperature of the cooling water introduced into the air conditioning cooling water circuit;
When the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the air conditioning in the vehicle interior is requested, the cooling water temperature detecting means receives the output of the cooling water temperature detecting means, and the higher the cooling water temperature, An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling driving of the electric water pump so as to set a flow rate of cooling water flowing through the circuit to be small. When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. In a control device that controls an electric water pump that is a drive source for flowing water,
An air flow detecting means for detecting the air flow toward the vehicle interior;
When driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the vehicle interior, the output of the air flow detection means is received, and the smaller the air flow toward the vehicle interior, the air conditioning An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the electric water pump so as to set the flow rate of the cooling water flowing through the cooling water circuit to be small. Mounted in an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, receives the driving force of the internal combustion engine, and supplies the cooling water to the cooling water circulation circuit of the internal combustion engine An internal combustion engine comprising: a mechanical water pump serving as a drive source for flowing air; and an electric water pump serving as a drive source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine. When the engine is driven, the cooling water is circulated by driving the mechanical water pump. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the vehicle interior is requested to be air-conditioned, In the electric water pump control device for an automotive air conditioning system configured to circulate cooling water to the air conditioning cooling water circuit by driving the water pump,
An air flow detecting means for detecting the air flow toward the vehicle interior;
When driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the vehicle interior, the output of the air flow detection means is received, and the smaller the air flow toward the vehicle interior, the air conditioning An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the electric water pump so as to set the flow rate of the cooling water flowing through the cooling water circuit to be small. When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. In a control device that controls an electric water pump that is a drive source for flowing water,
Primary air temperature detecting means for detecting a primary air temperature that is a temperature before heat exchange of air that performs heat exchange with the cooling water flowing through the cooling water circuit for air conditioning;
When driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and a request for air conditioning in the vehicle interior is made, the output of the primary side air temperature detecting means is received, and the higher the primary side air temperature, the more the air conditioning. An electric water pump control apparatus for an automobile, comprising: an electric water pump control means for controlling driving of the electric water pump so as to set a flow rate of the cooling water flowing through the cooling water circuit. Mounted in an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, receives the driving force of the internal combustion engine, and supplies the cooling water to the cooling water circulation circuit of the internal combustion engine An internal combustion engine comprising: a mechanical water pump serving as a drive source for flowing air; and an electric water pump serving as a drive source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine. When the engine is driven, the cooling water is circulated by driving the mechanical water pump. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the vehicle interior is requested to be air-conditioned, In the electric water pump control device for an automotive air conditioning system configured to circulate cooling water to the air conditioning cooling water circuit by driving the water pump,
Primary air temperature detecting means for detecting a primary air temperature that is a temperature before heat exchange of air that performs heat exchange with the cooling water flowing through the cooling water circuit for air conditioning;
When driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and a request for air conditioning in the vehicle interior is made, the output of the primary side air temperature detecting means is received, and the higher the primary side air temperature, the more the air conditioning. An electric water pump control apparatus for an automobile, comprising: an electric water pump control means for controlling driving of the electric water pump so as to set a flow rate of the cooling water flowing through the cooling water circuit. When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. In a control device that controls an electric water pump that is a drive source for flowing water,
Primary air temperature detecting means for detecting a primary air temperature that is a temperature before heat exchange of air that performs heat exchange with the cooling water flowing through the cooling water circuit for air conditioning;
When the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the passenger compartment, the conditioned air blown toward the passenger compartment upon receiving the output of the primary air temperature detecting means. When the primary air temperature is lower than the target temperature of the conditioned air, the cooling water flowing through the air conditioning cooling water circuit is smaller as the temperature difference is smaller. An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the electric water pump so as to set the flow rate of the motor at a low level. Mounted in an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, receives the driving force of the internal combustion engine, and supplies the cooling water to the cooling water circulation circuit of the internal combustion engine An internal combustion engine comprising: a mechanical water pump serving as a drive source for flowing air; and an electric water pump serving as a drive source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine. When the engine is driven, the cooling water is circulated by driving the mechanical water pump. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the vehicle interior is requested to be air-conditioned, In the electric water pump control device for an automotive air conditioning system configured to circulate cooling water to the air conditioning cooling water circuit by driving the water pump,
Primary air temperature detecting means for detecting a primary air temperature that is a temperature before heat exchange of air that performs heat exchange with the cooling water flowing through the cooling water circuit for air conditioning;
When the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the passenger compartment, the conditioned air blown toward the passenger compartment upon receiving the output of the primary air temperature detecting means. When the primary air temperature is lower than the target temperature of the conditioned air, the cooling water flowing through the air conditioning cooling water circuit is smaller as the temperature difference is smaller. An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the electric water pump so as to set the flow rate of the motor at a low level. When a predetermined internal combustion engine automatic stop condition is established, it is mounted on an automobile that performs internal combustion engine automatic stop control to stop driving of the internal combustion engine, and is cooled by an air conditioning cooling water circuit branched from the cooling water circulation circuit of the internal combustion engine. In a control device that controls an electric water pump that is a drive source for flowing water,
Heat exchanger temperature detecting means for detecting the temperature of a heat exchanger that performs heat exchange between the cooling water flowing through the cooling water circuit for air conditioning and air;
When the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the passenger compartment, the output of the heat exchanger temperature detection means is received and the target value of the heat exchanger temperature is detected as described above. Compared to the heat exchanger temperature, the electric water pump so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be lower as the detected heat exchanger temperature is higher than the target value of the heat exchanger temperature. An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the motor. Mounted in an automobile that performs an internal combustion engine automatic stop control for stopping the drive of the internal combustion engine when a predetermined internal combustion engine automatic stop condition is satisfied, receives the driving force of the internal combustion engine, and supplies the cooling water to the cooling water circulation circuit of the internal combustion engine An internal combustion engine comprising: a mechanical water pump serving as a drive source for flowing air; and an electric water pump serving as a drive source for flowing cooling water to the cooling water circuit for air conditioning branched from the cooling water circulation circuit of the internal combustion engine. When the engine is driven, the cooling water is circulated by driving the mechanical water pump. On the other hand, when the driving of the internal combustion engine is stopped by the internal combustion engine automatic stop control and the vehicle interior is requested to be air-conditioned, In the electric water pump control device for an automotive air conditioning system configured to circulate cooling water to the air conditioning cooling water circuit by driving the water pump,
Heat exchanger temperature detecting means for detecting the temperature of a heat exchanger that performs heat exchange between the cooling water flowing through the cooling water circuit for air conditioning and air;
When the drive of the internal combustion engine is stopped by the internal combustion engine automatic stop control and an air conditioning request is made in the passenger compartment, the output of the heat exchanger temperature detection means is received and the target value of the heat exchanger temperature is detected as described above. Compared to the heat exchanger temperature, the electric water pump so that the flow rate of the cooling water flowing through the cooling water circuit for air conditioning is set to be lower as the detected heat exchanger temperature is higher than the target value of the heat exchanger temperature. An electric water pump control device for an automobile, comprising: an electric water pump control means for controlling the driving of the motor.   An automotive air conditioning system comprising the electric water pump control device according to any one of claims 1 to 10, wherein the internal combustion engine drive is stopped by the internal combustion engine automatic stop control, and An automotive air conditioning system configured to adjust a flow rate of cooling water flowing through an air conditioning cooling water circuit by controlling driving of an electric water pump when an air conditioning request is made.

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