JP5316467B2 - Vehicle control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To include a pump that variably controls the amount of cooling water ejected to a circulation waterway and suppress the leakage of the cooling water when the leakage of the cooling water from the circulation waterway is predicted. <P>SOLUTION: Cooling parts 10, 20 include: the circulation waterways 17, 26 that circulate the cooling water of a vehicle drive system; and the pumps 12, 23 that can variably control the ejection amount of the cooling water ejected to the circulation waterways 17, 26. A control device 91 restricts the ejection amount of the pumps 12, 26 based on the fact that an airbag device 41 is started when the leakage of the cooling water from the circulation waterways 17, 26 is predicted. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a vehicle control device including a cooling device that cools a drive source of a vehicle by circulating cooling water in a circulation channel through a pump whose discharge amount is variably controlled, such as an electric pump.

  In a vehicle that travels using an internal combustion engine as a drive source, in order to prevent an excessive increase in temperature in the internal combustion engine, particularly in the vicinity of the engine combustion chamber, due to heat generated during operation of the internal combustion engine, A water jacket is formed, and the cooling water discharged from the pump is circulated between the water jacket and the radiator so that the internal combustion engine including the vicinity of the engine combustion chamber is maintained at an appropriate temperature. Conventionally, as a pump for such a cooling device, an engine-driven pump in which a rotating shaft is drivingly connected to an engine output shaft has been widely used. In such an engine-driven pump, the discharge amount is uniquely determined based on the rotational speed of the engine output shaft.

  On the other hand, in recent years, as described in Patent Document 1, for example, a cooling device that employs an electric pump instead of such an engine-driven pump has been proposed. According to a cooling device employing such an electric pump, the amount of cooling water discharged from the electric pump is reduced to limit the cooling water circulation amount until the cooling water temperature rises to some extent, for example, when it is cold, and its cooling capacity It is possible to execute precise cooling control in accordance with the temperature state of the internal combustion engine, such as promoting warm-up by temporarily reducing the engine temperature.

JP 2006-214280 A

  By the way, if a pipe or the like constituting the circulating water channel of the cooling water is cracked or the piping falls out from a predetermined mounting location, the cooling water may leak out from the circulating water channel. The coolant for cooling the drive source of the vehicle such as an internal combustion engine has a very low solidification temperature in order to maintain a predetermined cooling capacity without solidification even when the environmental temperature of the vehicle is extremely low, for example. Contains harmful components such as ethylene glycol. For this reason, when the cooling water leaks to the outside, there is a possibility that the surrounding environment may be adversely affected. In addition, although it illustrated about the vehicle which uses an internal combustion engine as a drive source, the bad influence by the leakage of such cooling water is, for example, the vehicle which uses a motor generator as a drive source, and uses both an internal combustion engine and a motor generator as a drive source. The same can occur in so-called hybrid vehicles.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a pump in which the amount of cooling water discharged to the circulation channel is variably controlled, and leakage of the cooling water from the circulation channel is predicted. An object of the present invention is to provide a vehicle control device capable of suppressing the leakage when the operation is performed.

In the following, means for achieving the above object and its effects are described.
The invention according to claim 1 is a circulation water passage through which cooling water for cooling a vehicle drive system including a vehicle drive source circulates, a pump for discharging and circulating the cooling water in the circulation water passage, and a discharge amount of the pump And a pump control means for variably controlling the vehicle. The vehicle control apparatus comprises a detection means for detecting a specific event in which leakage of the cooling water from the circulation channel is predicted, and the pump control means When an event is detected, a discharge amount restriction process for restricting the discharge amount of the pump is executed.

  According to this configuration, when there is a high probability that cooling water has leaked from the circulation water channel, such as cracks in the piping constituting the circulation water channel, pipes falling off from a predetermined mounting location, etc. Since the discharge amount of the pump is limited, it is possible to prevent a large amount of cooling water from continuously leaking from the circulation water channel to the outside. In addition, in the discharge amount limiting process for limiting the discharge amount of the pump in this way, in addition to setting an upper limit value for the pump discharge amount and controlling the pump so that the discharge amount does not exceed this, the discharge of cooling water It is also included that embodies this in a manner that stops itself and prohibits cooling water circulation in the circulation channel. In addition, the “circulation water passage through which the cooling water for the vehicle drive system including the vehicle drive source circulates” includes not only the circulation water passage for cooling the drive source itself but also a device that generates heat when the drive source is operated. A cooling water circulation channel for cooling and a cooling water circulation channel for cooling the drive source together with a device that generates heat when the drive source operates are included.

  According to a second aspect of the present invention, in the vehicle control device according to the first aspect, the detection means includes a sensor that detects an impact force acting on the vehicle, and the impact force detected by the sensor is a predetermined threshold value. The above is detected as the specific event.

  According to this configuration, even if the cooling water leaks from the circulating water channel due to the impact force acting on the vehicle, this can be properly predicted, and a large amount of cooling water continues to leak from the circulating water channel to the outside. It becomes possible to suppress this. The “sensor for detecting the impact force acting on the circulation channel” includes other physical quantities that change in correlation with the impact force acting on the vehicle, such as an acceleration sensor, as well as a sensor that directly detects the impact force. A sensor to be detected is also included.

  According to a third aspect of the present invention, in the vehicle control apparatus according to the second aspect, the detection means includes an acceleration sensor provided in the vehicle as the sensor, and an acceleration detected by the acceleration sensor is The specific event is detected as being equal to or greater than a predetermined threshold value for starting the occupant protection device.

  According to a fourth aspect of the present invention, in the vehicle control device according to the first aspect, the detection means detects the activation of the vehicle occupant protection device as the specific event.

  When an occupant protection device is activated, such as when a vehicle collides, a large impact force acts on the vehicle. As described above, the piping constituting each circulation channel is cracked, or the piping falls off from a predetermined mounting location. And the probability of cooling water leaking from the circulation channel is extremely high. According to the invention described in claim 3 or claim 4, since the discharge amount of the cooling water is limited when the occupant protection device is started as described above, the cooling water is cooled from the circulation water channel due to a vehicle collision or the like. Even when water leaks out, this can be reliably detected, and it is possible to suitably suppress a large amount of cooling water from leaking out of the circulation water channel to the outside.

  In particular, according to the third aspect of the invention, since the acceleration sensor for determining whether or not to activate the occupant protection device is used to predict the leakage of the cooling water from the circulation water channel, There is no need to provide a dedicated sensor separately, and the sensors can be generalized.

  Further, according to the fourth aspect of the present invention, the present invention is not limited to the case where the occupant protection device is activated on the condition that the acceleration (deceleration) detected by the acceleration sensor is equal to or greater than the threshold, and the vehicle traveling environment and surroundings Including a vehicle equipped with an occupant protection device that is activated when the environment is monitored through other sensors and it is determined that the vehicle collision cannot be avoided according to the monitoring results, including that the activation condition is satisfied Further, it is possible to adopt a configuration in which the activation of the passenger protection device is set as a specific event, and the discharge amount of the pump is limited when the specific event is detected.

  As a representative example of the occupant protection device, an air bag device can be cited. In addition, for example, when acceleration corresponding to a vehicle collision is detected, the occupant can be secured by rolling up and fixing the seat belt. This also includes a seat belt device that is temporarily restrained.

  According to a fifth aspect of the present invention, in the vehicle control device according to the first aspect, the pump is an electric rotary pump, and the pump control means includes a rotational speed sensor that detects a rotational speed of the pump. And the pump is controlled based on a reference control value set in advance corresponding to the target rotational speed so that the detected rotational speed becomes the target rotational speed, and the detection means includes the reference When the pump is controlled based on a control value, it is detected as the specific event that the rotational speed detected by the rotational speed sensor is higher than the target rotational speed and the deviation is not less than a predetermined determination value. It is said to be a thing.

  If the amount of cooling water staying in the circulation channel decreases due to leakage of cooling water, the rotational resistance acting on the pump will decrease, so the actual rotational speed of the pump will rise above the target rotational speed. Become. According to the above configuration, the pump is controlled based on a reference control value set in advance corresponding to the target rotational speed, the actual rotational speed is higher than the target rotational speed, and the deviation degree is equal to or greater than a predetermined determination value. In some cases, it is judged that there is a high probability that cooling water has leaked from the circulating water channel, and the pump discharge rate is limited, so that a large amount of cooling water will continue to leak from the circulating water channel to the outside. Can be suppressed.

  Further, as described above, when the amount of cooling water staying in the circulation channel decreases, the rotational resistance acting on the pump decreases, but the degree of decrease at that time increases as the pump rotational speed increases. That is, as the pump rotational speed is higher, the stirring resistance when cooling water is discharged increases, so the degree of decrease in the stirring resistance due to the decrease in the amount of cooling water increases, and the pump rotational speed further increases. It will be remarkable. Therefore, as in the sixth aspect of the invention, in the case where it is detected as a specific event that the actual rotational speed of the pump is higher than the target rotational speed and the deviation degree is equal to or greater than a predetermined determination value, this determination is performed. By adopting a configuration in which the value is set to a larger value as the target rotational speed is higher, leakage of cooling water from the circulation channel is achieved in accordance with the degree of reduction in stirring resistance caused by such a decrease in the amount of cooling water. It can be predicted more accurately.

  According to a seventh aspect of the present invention, in the vehicle control device according to any one of the first to sixth aspects, when the specific event is detected, the amount of heat generated when the drive source is activated is reduced. Drive source control means for executing an operation load limiting process for limiting the operation load of the drive source.

  According to this configuration, when there is a high probability that cooling water has leaked from the circulation water channel, the operating load of the drive source can be limited to reduce the amount of heat generated during the operation. For this reason, the cooling capacity required to operate the drive source in an appropriate temperature environment can be reduced, and even if the pump discharge rate is limited, the drive source excessively rises in temperature. And thermal damage caused by it can be avoided. Note that the operation load limiting process for limiting the operation load of the drive source in this way sets an upper limit value for the fuel injection amount injected per hour, for example, when an internal combustion engine is used as the drive source of the vehicle. In the case where the fuel injection amount is controlled so as not to exceed the upper limit value, and the motor generator is adopted as the drive source, an upper limit value is set for the supplied power amount, and the supplied power amount is This can be realized in such a manner that control is performed so as not to exceed the upper limit value.

  The invention according to claim 8 cools an electric drive system including a circulating water passage through which cooling water for cooling a mechanical drive system including an internal combustion engine as a vehicle drive source circulates and a motor generator as a drive source for the vehicle. A pair of independent circulation channels composed of circulation channels through which cooling water circulates, a pair of pumps provided separately for each circulation channel and discharging cooling water to these circulation channels, and the discharge amount of these pumps In a control apparatus for a vehicle having a cooling device that includes a pump control unit that variably controls each, a detection unit that detects a specific event in which leakage of cooling water from each circulation channel is predicted is provided, and the pump control unit includes When a specific event is detected, a discharge amount limiting process for limiting the discharge amount of at least one of the pumps is executed.

  According to this configuration, the cooling water flows from each circulation channel because cracks occur in the piping constituting the circulation channel of the mechanical drive system or the electric drive system, or the piping falls out from a predetermined mounting location. When there is a high probability of leakage, since the discharge amount of at least one of the pumps that discharge cooling water to each circulation channel is limited, at least in such a circulation channel where the discharge rate is limited. Can suppress a large amount of cooling water from continuously leaking from the circulation channel to the outside. In addition, in the discharge amount limiting process for limiting the discharge amount of the pump in this way, in addition to setting an upper limit value for the pump discharge amount and controlling the pump so that the discharge amount does not exceed this, the discharge of cooling water It is also included that embodies this in a manner that stops itself and prohibits cooling water circulation in the circulation channel. In addition, the “circulation channel through which the cooling water for the electric drive system circulates” includes a circulation channel through which the cooling water for cooling the motor generator circulates, and a circulation channel for the cooling water for cooling the power control device of the motor generator such as an inverter. Furthermore, it is assumed that both of the motor-generator and the cooling water circulation channel for cooling both of the power control devices are included. The motor generator includes not only an assembly of the motor and the generator, but also a motor generator that is mounted on the vehicle as a separate body. The “circulation water channel through which the cooling water of the electric drive system circulates” is an assembly, a separately configured one, both of which cool the motor, cool the generator, both It also includes those that cool together.

  According to a ninth aspect of the present invention, in the vehicle control apparatus according to the eighth aspect, the detection means includes a sensor for detecting an impact force acting on the vehicle, and the impact force detected by the sensor is a predetermined threshold value. This is detected as the specific event.

  According to this configuration, even if the cooling water leaks from the circulating water channel due to the impact force acting on the vehicle, this can be properly predicted, and a large amount of cooling water continues to leak from the circulating water channel to the outside. It becomes possible to suppress this. The “sensor for detecting the impact force acting on the circulation channel” includes other physical quantities that change in correlation with the impact force acting on the vehicle, such as an acceleration sensor, as well as a sensor that directly detects the impact force. A sensor to be detected is also included.

  According to a tenth aspect of the present invention, in the vehicle control device according to the eighth aspect, the detection means includes an acceleration sensor provided in the vehicle as the sensor, and the acceleration detected by the acceleration sensor The specific event is detected as being equal to or greater than a predetermined determination value for activating the passenger protection device.

  According to an eleventh aspect of the present invention, in the vehicle control device according to the eighth aspect, the detection means detects that the vehicle occupant protection device is activated as the specific event.

  When an occupant protection device is activated, such as when a vehicle collides, a large impact force acts on the vehicle. As described above, the piping constituting each circulation channel is cracked, or the piping falls off from a predetermined mounting location. And the probability of cooling water leaking from each circulation channel becomes extremely high. According to the invention described in claim 10 or claim 11, since the discharge amount of the cooling water is limited when the occupant protection device is activated as described above, each circulation water channel is associated with a vehicle collision or the like. Even when the cooling water leaks out, this can be reliably detected, and it is possible to suitably suppress a large amount of cooling water from continuing to leak out from each circulation channel.

  In particular, according to the invention described in claim 10, since the acceleration sensor for determining whether or not to activate the occupant protection device is used, the leakage of the cooling water from each circulation channel is predicted. It is not necessary to provide a dedicated sensor separately, and the sensors can be generalized.

  Further, according to the invention described in claim 11, the occupant protection device is not limited to a sensor that detects an impact force acting on the vehicle, such as an acceleration sensor. The vehicle is equipped with an occupant protection device that is activated when it is determined that a vehicle collision cannot be avoided. It is also possible to adopt a configuration in which this is set as a specific event, and the discharge amount of the pump is limited when the specific event is detected.

  As a representative example of the occupant protection device, an air bag device can be cited. In addition, for example, when acceleration corresponding to a vehicle collision is detected, the occupant can be secured by rolling up and fixing the seat belt. This also includes a seat belt device that is temporarily restrained.

  According to a twelfth aspect of the present invention, there is provided the vehicle control device according to any one of the eighth to eleventh aspects, wherein the pump control means uses the pump of the circulating water passage of the mechanical drive system during the discharge amount limiting process. Discharging is stopped, and further selecting means for stopping the operation of the internal combustion engine and selecting only the motor generator as a drive source of the vehicle is provided.

  When comparing an internal combustion engine used as a vehicle drive source with a motor generator, the internal combustion engine generally obtains its energy by combustion of an air-fuel mixture. Therefore, the amount of generated heat is higher than that of a motor generator and its power supply equipment. Is big. For this reason, compared with the circulation channel of the electric drive system, a high cooling capacity is required for the circulation channel of the mechanical drive system, and the discharge pressure of the pump is set to be relatively high, and the cooling that stays in the circulation channel. The amount of water is also relatively large. Accordingly, when the above-described leakage of the cooling water occurs in the circulating water passage of the internal combustion engine, the adverse effect due to the leakage becomes more serious.

  In this regard, in the invention described in claim 12, when it is predicted that the cooling water leaks from the circulation water passage of the mechanical drive system or the electric drive system, the operation of the internal combustion engine is stopped and only the motor generator is driven. The vehicle is driven as a source, and the discharge of the cooling water by the pump is stopped for the circulating water passage of the mechanical drive system. For this reason, while the large amount of cooling water is prevented from leaking to the outside from the circulation water channel of the machine drive system, it is possible to perform the retreat traveling by the motor generator.

  However, if leakage of cooling water occurs not only in the mechanical drive system but also in the circulation path of the electric drive system, the degree of adverse effects caused by it is lower than that of the circulation path of the machine drive system. It is desirable to do something about this. In this respect, in the invention described in claim 13, the discharge amount is limited while the pump of the circulating water passage of the electric drive system is driven in the discharge amount limiting process, while the supply power supplied to the motor generator is predetermined. This is limited so that it is less than the value.

  According to this configuration, it is possible to limit the supply power supplied to the motor generator, in other words, the operating load of the motor generator and its power supply device, thereby reducing the amount of generated heat. For this reason, it is possible to reduce the cooling capacity required to operate the motor generator and the power supply device in an appropriate temperature environment, and the discharge amount of the pump in the circulation channel of the electric drive system is limited Even under such conditions, it is possible to avoid an excessive temperature rise of the motor generator and the power supply device and thermal damage caused by the temperature rise.

  According to a fourteenth aspect of the present invention, in the vehicle control device according to the eighth aspect, each of the pumps is an electric rotary pump, and the pump control means sets the rotational speed of each pump. Based on a reference control value set in advance corresponding to the target rotational speed so that the detected rotational speed becomes a target rotational speed corresponding to each pump. Each of the pumps is controlled, and the detection means is detected by the rotation speed sensor when the pump is controlled based on a reference control value set in advance corresponding to the target rotation speed. The rotational speed is higher than the target rotational speed, and the degree of divergence thereof is equal to or greater than a predetermined determination value. When the specific event is not detected only in one of the circulation channels of the electric drive system, the apparatus further comprises a selection unit that selects only one of them as a vehicle drive source, and the pump control unit performs the discharge amount limiting process. The discharge of the cooling water by the pump of the circulating water channel in the other of the mechanical drive system and the electric drive system is stopped.

  According to a fifteenth aspect of the present invention, in the vehicle control device according to the eighth aspect, each of the pumps is an electric rotary pump, and the pump control means sets the rotational speed of each pump. Based on a reference control value set in advance corresponding to the target rotational speed so that the detected rotational speed becomes a target rotational speed corresponding to each pump. Each of the pumps is controlled, and the detection means is detected by the rotation speed sensor when the pump is controlled based on a reference control value set in advance corresponding to the target rotation speed. The rotational speed is higher than the target rotational speed, and the degree of divergence thereof is equal to or greater than a predetermined determination value. And selecting means for selecting both the internal combustion engine and the motor generator as vehicle drive sources when the specific events are detected for both circulation channels of the electric drive system. In the discharge amount limiting process, the discharge amount is limited while driving the pumps of the circulating water channel in both the mechanical drive system and the electric drive system.

  If the amount of cooling water staying in the circulation channel decreases due to leakage of the cooling water, the rotational resistance acting on the pump decreases, so the actual rotational speed of the pump tends to increase above the target rotational speed. Can be seen. According to the invention described in claim 14 or claim 15, each pump is controlled based on a reference control value set in advance corresponding to the target rotation speed, and the actual rotation detected by each rotation speed sensor. If the speed is higher than the target rotational speed and the degree of deviation is greater than or equal to a predetermined judgment value, it is determined that there is a high probability that cooling water has leaked from the circulating water channel due to damage to the circulating water channel, etc. Since the amount is limited, it is possible to prevent a large amount of cooling water from continuously leaking from the damaged circulation channel to the outside. The determination value may be set to the same value for each circulation channel of the mechanical drive system and the electric drive system. However, in order to increase the detection accuracy of the specific event, the determination values of the mechanical drive system and the electric drive system are the same. It is desirable to set each separately based on the specifications of the pump in each circulation channel, the amount of cooling water retained, and the like.

  According to a sixteenth aspect of the present invention, in the vehicle control device according to the fifteenth aspect of the present invention, the operation of limiting the operating load of the drive source so that the amount of heat generated during the operation of the internal combustion engine and the motor generator is reduced. The driving source control means for executing the load limiting process is further provided.

  According to this configuration, when there is a high probability that cooling water has leaked from the circulation water passages of the mechanical drive system and the electric drive system, the amount of heat generated during operation of both the internal combustion engine and the motor generator can be reduced. . For this reason, the cooling capacity required to operate the internal combustion engine and the motor generator under an appropriate temperature environment can be reduced, respectively, and the discharge capacity of each pump is limited so that the original cooling capacity cannot be exhibited. Even under such conditions, it is possible to avoid an excessive temperature rise and thermal damage caused by both the internal combustion engine and the motor generator. In this operation load limiting process, if the engine is an internal combustion engine, an upper limit value is set for the fuel injection amount injected per hour, and the fuel injection amount is controlled so as not to exceed the upper limit value. If it is a generator, this can be embodied in such a manner that an upper limit value is set for the amount of supplied power and control is performed so that the amount of supplied power does not exceed the upper limit value.

  Further, as described above, when the amount of cooling water staying in the circulation channel decreases, the rotational resistance acting on the pump decreases, but the degree of decrease at that time increases as the pump rotational speed increases. That is, as the pump rotational speed is higher, the stirring resistance when cooling water is discharged increases, so the degree of decrease in the stirring resistance due to the decrease in the amount of cooling water increases, and the increase in the pump rotational speed is more remarkable. It will be a thing. Therefore, according to the invention described in claim 17, when detecting that the actual rotational speed of each pump is higher than the target rotational speed and the deviation is not less than a predetermined determination value as a specific event, By adopting a configuration in which the determination value is set to a larger value as the target rotational speed is higher, leakage of the cooling water from the circulation channel can be accurately predicted.

1 is a schematic configuration diagram showing a vehicle and a cooling device thereof according to a first embodiment of the present invention. The flowchart which shows the process sequence of the drive process about each pump of the internal combustion engine and mechanical drive system concerning the embodiment. The flowchart which shows the process sequence of the drive process about each pump of the internal combustion engine and mechanical drive system concerning 2nd Embodiment. The graph which shows the relationship between the duty ratio at the time of driving the pump of the mechanical drive system concerning 2nd Embodiment, and the rotational speed of a pump. The flowchart which shows the process sequence of the drive process about each pump of the mechanical drive system and electric drive system concerning 3rd Embodiment.

(First embodiment)
A vehicle control apparatus according to a first embodiment of the present invention will be described below with reference to FIGS. This vehicle is a so-called hybrid vehicle in which the internal combustion engine 11 and the motor generator 21 are mounted as drive sources.

  The driving forces of the output shafts of the internal combustion engine 11 and the motor generator 21 are input to the power split mechanism 31 and transmitted to the drive wheels 33 via the driving force transmission system. The operating load of the internal combustion engine 11 is basically adjusted through the fuel injection amount, while the operating load of the motor generator 21 is adjusted through the supply power supplied from the storage battery 25 via the inverter 22. In addition to the function of converting electrical energy into mechanical energy, the motor generator 21 regenerates the kinetic energy of the vehicle as electrical energy when the vehicle decelerates, and stores the regenerated electrical energy in the storage battery 25. It also has.

  Next, the cooling unit 10 that cools the mechanical drive system including the internal combustion engine 11 will be described. The cooling unit 10 includes a water jacket 16 formed around an engine combustion chamber (not shown) in the internal combustion engine 11, and a radiator 14 in which cooling water circulates between the water jacket 16. A thermostat 13 that permits / inhibits the flow of cooling water into the radiator 14, a pump 12 that discharges cooling water to the water jacket 16, and the cooling water discharged from the pump 12 is circulated to the water jacket 16, the radiator 14, and the like. It is comprised by the circulating water channel 17 which consists of a some channel | path. The cooling water whose temperature has risen due to the heat of the internal combustion engine 11 is introduced into the radiator 14 through the circulation water passage 17 and is cooled by exchanging heat with the outside air in the radiator 14.

  Next, the cooling unit 20 that cools the electric drive system including the motor generator 21 and the inverter 22 will be described. The cooling unit 20 includes a radiator 24 in which cooling water circulates between the motor generator 21 and the inverter 22, a pump 23 that discharges the cooling water, and a radiator 24 that discharges the cooling water discharged from the pump 12. The inverter 22 and the motor generator 21 are circulated in this order, and the circulation water channel 26 is circulated. The cooling water whose temperature has risen due to the heat of the motor generator 21 and the inverter 22 is introduced into the radiator 24 through the circulation water passage 26 and cooled by exchanging heat with the outside air in the radiator 24.

  Each of the pumps 12 and 23 of the mechanical drive system and the electric drive system is an electric rotary pump that sucks and discharges cooling water by rotating an impeller (both not shown) connected to the output shaft of the motor. is there. The discharge rate increases as the rotation speed of the motor, that is, the rotation speed of the pumps 12 and 23 increases. The rotational speeds of the pumps 12 and 23 are changed by duty-controlling the power supplied to the motors. That is, as the duty ratio DT increases, the power supplied to the pumps 12 and 23 increases, and the amount of cooling water discharged by the pumps 12 and 23 increases. The pumps 12 and 23 have rotation speed sensors 92 and 93 for detecting the rotation speed of the pump, respectively.

  On the other hand, an airbag device 41 is mounted on the vehicle as an occupant protection device. The airbag device 41 includes an acceleration sensor 94 in addition to a gas generating agent provided therein, an ignition device that ignites the gas generating agent to generate a combustion reaction (both not shown). . The acceleration sensor 94 is attached to the vehicle or built in the airbag device 41. The detection value of the acceleration sensor 94 is taken into the control device 91. When the detected value of the acceleration sensor 94 is equal to or greater than a predetermined threshold value, the control device 91 determines that the vehicle has collided and suddenly decelerated, and that a large impact force has acted on the vehicle. Outputs an ignition signal. When the ignition device ignites the gas generating agent based on the ignition signal, the gas generated by the combustion reaction of the gas generating agent is ejected into the airbag, and this is inflated and deployed between the vehicle body and the occupant. That is, the airbag device 41 is activated.

  By the way, if the pipes constituting the circulating water passages 17 and 26 of the mechanical drive system and the electric drive system are cracked or the pipes are dropped from a predetermined mounting location, the cooling water leaks from the circulating water passages 17 and 26. As described above, the leakage of the cooling water adversely affects the surrounding environment.

  Therefore, in the present embodiment, when an event in which the leakage of the cooling water from the circulation channels 17 and 26 can be predicted, in other words, an event (specific event) in which the leakage of the cooling water is predicted is detected, the circulation channels 17 and 26 are detected. The discharge amount limiting process for limiting the discharge amount of the cooling water in each of the pumps 12 and 23 of the cooling units 10 and 20 is executed for the purpose of preventing a large amount of cooling water from continuously leaking from the outside to the outside. I have to. Hereinafter, control related to the cooling units 10 and 20, the mechanical drive system, and the electric drive system when the specific event is detected, including the discharge amount restriction process, will be described with reference to the flowchart of FIG. 2. The series of processing shown in this flowchart is repeatedly executed by the control device 91 at predetermined intervals.

  First, it is determined whether the airbag device 41 is activated (step S110). Specifically, it is determined whether or not the detection value of the acceleration sensor 94 is equal to or greater than the predetermined threshold value described above. When the detection value of the acceleration sensor 94 is equal to or greater than the threshold value, that is, when a specific event is detected (step S110: YES), it is considered that a large impact force is applied to the vehicle due to a collision of the vehicle. In this case, there is a probability that the cooling water leaks from the circulating water channels 17 and 26 due to cracks in the pipings of the circulating water channels 17 and 26 caused by such an impact force acting on the vehicle, or the pipings falling off. Is expensive. For this reason, the control apparatus 91 performs the cooling water leakage suppression process which consists of a series of processes demonstrated below.

  In this cooling water leakage suppression process, first, the operation of the pump 12 of the mechanical drive system is stopped (step S130). In the present embodiment, when leakage of cooling water is predicted from the circulation water channels 17 and 26, the operation of the pump 12 of the machine drive system is stopped, and at least a large amount of cooling water is externally provided from the circulation water channel 17 of the machine drive system. It is trying to suppress continuing leakage.

  That is, since the internal combustion engine 11 obtains its energy by combustion of the air-fuel mixture, it generates a larger amount of heat than the motor generator 21 and the inverter 22. For this reason, compared with the cooling unit 20 of the electric drive system, the cooling unit 10 of the mechanical drive system is required to have a higher cooling capacity. Therefore, compared with the electric drive system, the discharge pressure of the pump 12 of the mechanical drive system is set to be relatively high, and the amount of cooling water staying in the circulation water channel 17 is also relatively large. Therefore, when the leakage of the cooling water as described above occurs in the circulating water channel 17 of the cooling unit 10, the adverse effect due to the leakage becomes serious. For this reason, in the present embodiment, the operation of the pump 12 of the machine drive system is stopped to prevent a large amount of cooling water from continuously leaking from the circulation water channel 17 of the machine drive system. . Thus, after stopping the operation of the pump 12 of the mechanical drive system, the motor generator 21 is selected as a drive source, while the operation of the internal combustion engine 11 is stopped (step S140).

  Here, when the detection value of the acceleration sensor 94 is equal to or greater than the above-described threshold value, there is a possibility that the cooling water has leaked from the circulating water passage 26 of the electric drive system. Although the degree of adverse effects due to the leakage of the cooling water from the circulation water passage 26 of the electric drive system is lower than that due to the leakage of the cooling water from the circulation water passage 17 of the mechanical drive system, the circulation water passage 26 of the electric drive system also It is desirable to take some measures. Therefore, an upper limit value is set for the rotational speed of the pump 23 of the electric drive system, so that the rotational speed does not exceed this upper limit value, in other words, the discharge amount of the cooling water by the pump 23 of the electric drive system is the upper limit discharge amount. This is limited so as not to exceed (step S150).

  However, if the rotational speed of the pump 23 of the electric drive system is limited in this way, the cooling capacity of the cooling unit 20 is reduced, and thus there is a concern that the temperature of the motor generator 21 and the inverter 22 will rise excessively. Therefore, next, an upper limit is set for the power supplied to the motor generator 21 and is limited so that the power supplied does not exceed the upper limit. That is, the operating load of the motor generator 21 and the inverter 22 is limited (step S160).

  On the other hand, when the airbag device 41 is not activated (step S110: NO), that is, when the above-described specific event is not detected, the internal combustion engine 11, the motor generator 21, and the cooling units 10 and 20 are normally controlled. (Step S120).

According to this embodiment described above, the following effects can be obtained.
(1) According to the above embodiment, when it is predicted that the cooling water leaks from the circulation water channels 17 and 26 of the respective cooling units 10 and 20, that is, when the above-described specific event is detected, the machine drive The operation of the pump 12 in the cooling unit 10 of the system is stopped. For this reason, even if the circulating water passages 17 and 26 are cracked or the piping is dropped from a predetermined mounting location, the cooling water leaks from the circulating water passages 17 and 26 at least. It can be suppressed that a large amount of cooling water continuously leaks from the circulation water channel 17 of the machine drive system.

  (2) In particular, in the cooling unit 10 of the mechanical drive system, the discharge pressure of the pump 12 is set relatively high compared to the cooling unit 20 of the electric drive system, and the cooling stays in the circulation water channel 17. Since the amount of water is relatively large, problems due to leakage of the cooling water are likely to become obvious, but the cooling water leaks because the circulation of the cooling water in the cooling unit 10 of the mechanical drive system is stopped. Thus, adverse effects on the surrounding environment can be minimized.

  (3) When a specific event is detected in this way, the operation of the internal combustion engine 11 is stopped, while the motor generator 21 is selected as a drive source, and the motor generator 21 is caused to travel the vehicle. Yes. Accordingly, the motor generator 21 can be evacuated while suppressing leakage of the cooling water.

  (4) Further, when the motor generator 21 is operated as a drive source in this way, the rotational speed of the pump 23, that is, the discharge amount thereof is limited for the cooling unit 20 of the electric drive system. Therefore, even in a situation where the cooling water can leak from the circulating water passage 26 of the cooling unit 20 in the electric drive system, the leakage can be suppressed and the leakage amount can be minimized.

  (5) Further, in addition to limiting the discharge amount of the pump 23 of the cooling unit 20 in this way, the power supplied to the motor generator 21 is also limited, so the motor generator 21 and the inverter Even if the cooling capacity required to operate the battery 22 in an appropriate temperature environment can be reduced and the original cooling capacity of the cooling unit 20 cannot be exhibited, the excessive temperature of the motor generator 21 or the like It becomes possible to avoid the rise and the thermal damage caused by it.

  (6) Using the detected value of the acceleration sensor 94 used in the airbag device 41, it is determined whether or not the leakage of the cooling water from the circulating water channels 17 and 26 can be predicted, that is, whether or not a specific event has been detected. Therefore, it is not necessary to provide a dedicated sensor separately, and the sensors can be generalized.

  (7) When the detected value of the acceleration sensor 94 is equal to or greater than the threshold value and the airbag device 41 is activated, that is, when a large impact force is applied to the vehicle, the discharge amount of the pump 23 of the cooling unit 20 is limited. Therefore, even if the cooling water leaks from one of the circulating water channels 17 and 26 due to a vehicle collision or the like, this can be reliably detected, and any of the circulating water channels 17 and 26 can be detected. Therefore, it is possible to suitably suppress a large amount of cooling water from leaking to the outside.

(Second Embodiment)
The second embodiment according to the present invention will be described with reference to FIGS. 3 and 4 in addition to FIGS. 1 and 2, focusing on the differences from the first embodiment. In addition, about the structure similar to 1st Embodiment, the detailed description is omitted by attaching | subjecting the same code | symbol.

  In the present embodiment, the cooling unit 10 of the mechanical drive system uses the rotational speed sensor 92 of the pump 12 to predict whether or not a leakage of cooling water is predicted for at least one of the circulating water channels 17 and 26, that is, a specific event is detected. It is determined whether or not it has been done. In the present embodiment, similarly to the first embodiment, when leakage of the cooling water from the circulation water channels 17 and 26 is predicted, the operation of the pump 12 of the mechanical drive system is stopped and at least the circulation of the mechanical drive system is performed. A large amount of cooling water is prevented from continuing to leak from the water channel 17 to the outside.

  Hereinafter, control related to the cooling units 10 and 20, the mechanical drive system, and the electric drive system in the present embodiment will be described with reference to the flowchart of FIG. 3. The series of processing shown in this flowchart is repeatedly executed by the control device 91 at predetermined intervals.

  First, based on the detection value of the rotation speed sensor 92, it is determined whether or not the actual rotation speed Nea of the pump 12 of the mechanical drive system is higher than the target rotation speed Net and the deviation is equal to or greater than the determination value α (step S210).

  The determination value α will be described with reference to FIG. As described above, the rotational speed of the pump 12 is changed by duty-controlling the power supplied to the motor. As shown by the solid line in FIG. 4, the duty ratio DT of the supplied power is set in advance corresponding to the target rotational speed Net so that the rotational speed of the pump 12 becomes the target rotational speed Net.

  By the way, if the cooling water leaks from the circulating water channel 17 and the amount of the cooling water staying in the circulating water channel 17 decreases, the resistance acting on the impeller of the pump 12 decreases, so the actual rotational speed Nea is the target rotation. It becomes larger than the speed Net. Therefore, in the present embodiment, as indicated by a one-dot chain line in FIG. 4, a determination value α is set corresponding to each target rotational speed Net, and the deviation between the actual rotational speed Nea and the target rotational speed Net is the determination value. If it is greater than α, the cooling from the circulating water channel 17 will still take into account other factors that increase the rotational speed, such as individual differences between pumps, cooling water viscosity, and temporary air retention in the vicinity of the pump impeller. It is determined that water leakage is expected.

  Further, the degree of decrease in the stirring resistance due to the leakage of the cooling water from the circulation water channel 17 and the decrease in the amount of the cooling water in the circulation water channel 17 tends to increase as the duty ratio DT increases. is there. This is because the higher the duty ratio DT, the higher the rotational speed of the pump, that is, the larger the discharge amount, and the greater the stirring resistance when cooling water is discharged. Therefore, in the present embodiment, as shown in FIG. 4, the determination value α is set so as to increase as the duty ratio DT increases, that is, as the target rotational speed increases.

  Next, when it is determined that the deviation between the actual rotational speed Nea of the pump 12 and the target rotational speed Net is greater than or equal to the determination value α (step S210: YES), it is determined that cooling water is leaking from the circulation water channel 17. Then, the cooling water leakage suppression process (step S130 to step S160) described in FIG. 2 is executed (step S230).

  On the other hand, when it is determined that the deviation between the actual rotational speed Nea and the target rotational speed Net is less than the determination value α, that is, the cooling water leaks in the circulating water channels 17 and 26 (NO in step S210) of the cooling units 10 and 20. If not, the control device 91 normally controls the cooling units 10 and 20, the mechanical drive system, and the electric drive system (step S220).

According to this embodiment described above, in addition to the effects described in (1) to (5) above, the following effects can be achieved.
(8) According to the present embodiment, the amount of the cooling water staying in the circulation channel 17 due to the leakage of the cooling water is reduced, so that the actual rotational speed Nea and the target rotation of the pump 12 for the cooling unit 10 of the mechanical drive system are reduced. When the deviation from the speed Net is greater than or equal to the determination value α, the discharge amount of the pump 12 is limited on the assumption that leakage of cooling water is predicted not only in the circulating water channel 17 of the mechanical drive system but also in the circulating water channel 26 of the electric drive system. Therefore, even when cooling water leaks from the circulating water channel 17 due to damage to the circulating water channel 17 or the like, this can be reliably detected, and a large amount of water can be discharged from the circulating water channel 17 to the outside. It can suppress suitably that cooling water will continue leaking.

(Third embodiment)
The third embodiment according to the present invention will be described with reference to FIG. 5 in addition to the previous FIG. 4, focusing on the differences from the first embodiment. In addition, about the structure similar to 1st Embodiment, the detailed description is omitted by attaching | subjecting the same code | symbol.

  In the present embodiment, the rotational speed sensors 92 and 93 provided in the pumps 12 and 23 of the cooling units 10 and 20 are used for the circulating water passages 17 and 26 of both the mechanical drive system and the electric drive system. It is made to detect whether it is in the situation where the leakage of is predicted. That is, a specific event is detected for each of the circulation channels 17 and 26.

  Hereinafter, the control concerning each cooling part 10 and 20 in the said embodiment, a mechanical drive system, and an electric drive system is demonstrated with reference to the flowchart of FIG. The series of processing shown in this flowchart is repeatedly executed by the control device 91 at predetermined intervals.

  As shown in the flowchart of FIG. 5, in this series of processing, first, it is determined whether or not the deviation between the actual rotational speed Nea and the target rotational speed Net is greater than or equal to a determination value α for the pump 12 of the mechanical drive system ( Step S310). When it is determined that the deviation between the actual rotation speed Nea and the target rotation speed Net is greater than or equal to the determination value α (step S310: YES), the control device 91 determines that leakage of the cooling water from the circulation water channel 17 is predicted. Then, the abnormality flag Fe for the cooling unit 10 of the mechanical drive system is changed from its initial value “0” and set to “1” (step S320).

  On the other hand, when it is determined that the deviation between the actual rotational speed Nea of the pump 12 of the mechanical drive system and the target rotational speed Net is less than the determination value α (step S310: NO), the mechanical drive is also performed for the circulating water passage 26 of the electric drive system. Similar to the system, it is determined whether or not an event that is predicted to leak coolant is detected. That is, it is determined whether or not the actual rotational speed Nma of the pump 23 in the cooling unit 20 of the electric drive system is higher than the target rotational speed Nmt and the deviation thereof is less than the determination value β (step S340).

  Similarly to the mechanical drive system pump 12, the electric drive system pump 23 also reduces its actual rotational speed Nma when the amount of cooling water in the circulating water passage 26 decreases due to leakage of the cooling water and the resistance acting on the impeller of the pump 23 decreases. Becomes larger than the target rotational speed Nmt. However, the amount of cooling water staying in the circulation channel 26 of the electric drive system is smaller than that of the circulation channel 17 of the mechanical drive system, and the specifications of the pumps 12 and 23 are different. The deviation between the actual rotation speed Nma and the target rotation speed Nmt that occurs when the coolant leaks differs from that of the mechanical drive pump 12. Therefore, in the present embodiment, the determination value β is set in a manner suitable for the cooling unit 20 of the electric drive system by considering the above-described matters. That is, the determination value β qualitatively has the same tendency as the determination value α, but is set to a value different from the determination value α.

  When it is determined that the deviation between the actual rotational speed Nma of the pump 23 and the target rotational speed Nmt is equal to or larger than the determination value β (step S340: YES), the cooling water is supplied from the circulation water passage 26 in the cooling unit 20 of the electric drive system. It is determined that the leakage has occurred, and the abnormality flag Fm for the cooling unit 20 of the electric drive system is changed from its initial value “0” and set to “1” (step S350). On the other hand, when it is determined that the deviation between the actual rotational speed Nma of the pump 12 and the target rotational speed Nmt is less than the determination value β (step S340: NO), the abnormality flag Fm is not changed and the abnormality flag is not changed. Fm is maintained at its initial value “0”. And about each cooling part 10 and 20 of a mechanical drive system and an electric drive system in this way, after judging separately whether those circulating water channels 17 and 26 are in the condition where leakage of cooling water can be predicted, A series of processing ends.

  Next, the control device 91 executes each control for the cooling units 10 and 20, the mechanical drive system, and the electric drive system based on the abnormality flags Fe and Fm set in this way as described below. To do.

[When Abnormal Flag Fe = "0", Abnormal Flag Fm = "0"]
Since neither the mechanical drive system nor the circulating water channels 17 and 26 of the electric drive system are in a state of leakage of cooling water, the control device 91 normally controls the cooling units 10 and 20, the mechanical drive system, and the electric drive system. .

[When Abnormal Flag Fe = "1", Abnormal Flag Fm = "0"]
Since the leakage of cooling water is predicted for the circulating water channel 17 of the machine drive system, the control device 91 stops the operation of the pump 12 of the machine drive system. When the operation of the pump 12 is stopped and the circulation of the cooling water is stopped in this way, the cooling capacity of the cooling unit 10 necessary for operating the internal combustion engine 11 under an appropriate temperature environment is reduced. There is a concern that the temperature will rise excessively. Therefore, the control device 91 limits the operating load of the internal combustion engine 11 so that the amount of heat generated by the internal combustion engine 11 becomes small. Specifically, an upper limit is set for the fuel injection amount injected per unit time, and is set so that the fuel injection amount does not exceed this upper limit value.

  On the other hand, since the circulating water passage 26 of the electric drive system is not in a state of leakage of cooling water, the control device 91 normally controls the motor generator 21 and the pump 23 of the cooling unit 20 for the electric drive system.

[When Abnormal Flag Fe = "0", Abnormal Flag Fm = "1"]
Since the leakage of cooling water is predicted for the circulation channel 26 of the electric drive system, the control device 91 stops the operation of the pump 23 of the electric drive system. If the operation of the pump 23 is stopped and the circulation of the cooling water is stopped in this way, the cooling capacity of the cooling unit 20 required to operate the motor generator 21 and the inverter 22 in an appropriate temperature environment is reduced. There is a concern that the temperature of the motor generator 21 and the inverter 22 will rise excessively. Therefore, the control device 91 limits the operating load of the motor generator 21 as described in the first embodiment.

  On the other hand, since the circulating water channel 17 of the mechanical drive system is not in a state of leakage of cooling water, the control device 91 normally controls the internal combustion engine 11 and the pump 12 of the cooling unit 20 for the mechanical drive system.

[When Abnormal Flag Fe = "1" and Abnormal Flag Fm = "1"]
Since it is highly probable that leakage of cooling water will occur in the circulation channels 17 and 26 of the mechanical drive system and the electric drive system, the control device 91 operates the pumps 12 and 23 for both the mechanical drive system and the electric drive system. To stop. At this time, since the cooling capacity of the cooling units 10 and 20 of the mechanical drive system and the electric drive system is reduced as described above, the control device 91 also restricts the operating load of the internal combustion engine 11 and the motor generator 21. Run.

According to this embodiment described above, in addition to the above-described effects described in (1) to (5), (8) and (9) above, the following effects can be achieved.
(10) According to this embodiment, a phenomenon in which the leakage of the cooling water is predicted for each of the circulating water channels 17, 26, that is, a specific phenomenon is detected for each of the circulating water channels 17, 26, and the leakage of the cooling water is predicted. Since the operation of the pump that discharges the cooling water to the circulating water channel is stopped, a large amount of cooling water flows out of the circulating water channels 17 and 26 where the leakage of the cooling water is predicted. In addition, the cooling capacity of the cooling part of the circulating water channel in which the leakage of the cooling water does not occur can be maintained.

  (11) As described above, the operating load on the drive system that has stopped the operation of the pump is limited, so that an excessive temperature rise of the drive source in the drive system and thermal damage caused thereby are avoided. Will be able to.

  (12) In each of the cooling units 10 and 20, normal control is performed for the pump that discharges the cooling water to the circulating water channel that is not in a state where the cooling water leaks and the drive source that corresponds to the circulating water channel. Therefore, the retreat travel can be performed using the same drive source.

  (13) When leakage of the cooling water is predicted for both the mechanical drive system and the circulating water passages 17 and 26 of the electric drive system, the discharge amounts of the pumps 12 and 23 of both the mechanical drive system and the electric drive system are limited. Therefore, it is possible to suppress a large amount of cooling water from flowing out from the circulating water channels 17 and 26 to the outside.

  (14) Further, in addition to limiting the discharge amounts of the pumps 12 and 23 of both the mechanical drive system and the electric drive system in this way, the operating loads of both the internal combustion engine 11 and the motor generator 21 are limited. Since the amount of heat generated during operation is reduced, the cooling capacity required to operate the internal combustion engine 11 and the motor generator 21 in an appropriate temperature environment can be reduced. , 23 even in a situation where the discharge capacity of the internal combustion engine 11 and the motor generator 21 cannot be exhibited due to the limited discharge amount of the internal combustion engine 11 and the motor generator 21, the occurrence of excessive temperature rise and the resulting thermal damage Will be able to.

  (15) The determination values α and β serving as the determination criteria for determining whether or not the leakage of the cooling water is predicted are determined based on the specifications of the pumps 12 and 23, the retention amount of the cooling water in the circulation channel, and the like. Since it is set separately, it becomes possible to improve the detection accuracy for the leakage of the cooling water.

  In addition, the embodiment of the present invention is not limited to the embodiment exemplified in each of the above-described embodiments, and can be implemented by changing this as shown below, for example. The following modifications are not applied only to the above embodiments, and different modifications can be combined with each other.

  (A) In the first embodiment, when the detected value of the acceleration sensor 94 is high and the divergence is equal to or higher than a predetermined determination value, that is, when the leakage of the cooling water is predicted, the operation of the motor generator 21 is performed. Although the load is limited, such a limitation process may be omitted.

  (B) In the first embodiment and the modified example (a), when the leakage of the cooling water is predicted, the discharge amount restriction process is executed for the pump 23 of the electric drive system. It may be omitted.

  (C) In the first embodiment and the modified examples (a) and (b), when the leakage of the cooling water is predicted in each of the circulating water channels 17 and 26, the motor generator 21 is selected as the drive source and the internal combustion engine is selected. Although the engine 11 is stopped, the motor generator 21 may be stopped by selecting the internal combustion engine 11 as a drive source. Furthermore, in this case, the operating load of the internal combustion engine 11 may be limited.

  (D) In the modification (c), the operation of the electric drive system pump 23 may be stopped and the mechanical drive system pump 12 may be operated. In this case, the discharge amount limiting process may be executed for the pump 12 of the mechanical drive system.

  (E) In the first embodiment and the modified examples (a) to (d), when the leakage of the cooling water is predicted, either the internal combustion engine 11 or the motor generator 21 is selected as the drive source. Both of these may be selected as drive sources. In this case, with respect to the restrictions on the operating loads of these drive sources, the operating loads of the internal combustion engine 11 and the motor generator 21 are limited, only the operating load of the internal combustion engine 11 is limited, and only the operating load of the motor generator 21 is limited. This can be done in various ways, such as limiting.

  (F) In the modified example (e), regarding the discharge amount limiting process of each pump 12, 23, only the discharge amount of the pump 12 of the electric drive system, which limits only the discharge amount of the pump 12 of the engine drive system, is limited. This can be executed in such a manner that the discharge amount of each of the pumps 12 and 23 is limited. In this case, at least one of the pumps 12 and 23 may be stopped as the discharge amount limiting process.

  (G) In the first embodiment and the modified examples related thereto, the cooling water leakage suppression process is executed when the acceleration sensor 94 has a detected value equal to or higher than a determination value for starting the airbag device 41. However, it is not always necessary to synchronize the start timing of the airbag device 41 and the execution timing of the cooling water leakage suppression process. For example, although a large impact force acts on the vehicle based on the detection value of the acceleration sensor and the airbag device 41 does not start, the above-described cooling water is applied to at least one of the circulating water channels 17 and 26 by this impact force. When the leakage can be predicted, the cooling water leakage suppression process may be executed. Moreover, you may make it detect directly the impact force which acts not only on an acceleration sensor but on a vehicle. In short, if an impact force acts on the vehicle and the circulating water passages 17 and 26 are damaged, and leakage of cooling water can be predicted, a sensor that detects other physical quantities is adopted, and the detection of this sensor is performed. The cooling water leakage suppression process can also be executed based on the value.

  (H) In the cooling water leakage suppressing process described in the first and second embodiments, the motor generator 21 and the electric drive system pump 23 are operated. The operation of the system pump 23 may be stopped. In other words, both the drive sources of the mechanical drive system and the electric drive system and the pumps 12 and 23 of the cooling units 10 and 20 may be stopped.

  (I) In the second embodiment, it is determined whether or not the leakage of the cooling water from the circulating water channel 17 is predicted based on the detection value of the rotational speed sensor 92 of the mechanical drive system. You may make it perform based on the detected value of the rotational speed sensor 93 of an electric drive system. In this case, when it is determined that the deviation between the actual rotational speed Nea of the electrically driven pump 23 and the target rotational speed Net is equal to or larger than the determination value β, the coolant leakage suppression process (step S230) is performed. Is preferred.

  (J) In the third embodiment, when the leakage of the cooling water is predicted only for the circulation water channel 17 of the mechanical drive system, the operation load of the internal combustion engine 11 is limited. However, such a limitation process is omitted. You may do it.

  (K) In the third embodiment, when only the circulating water passage 26 of the electric drive system is predicted to leak cooling water, the operating load of the motor generator 21 is limited. You may make it do.

  (L) In the third embodiment, when leakage of cooling water is predicted for both the mechanical drive system and the circulating water passages 17 and 26 of the electric drive system, both the internal combustion engine 11 and the motor generator 21 are used as drive sources. However, either one may be selected as a drive source and the other operation may be stopped. In this case, the operating load of the selected drive source may be reduced. According to the present embodiment, it is possible to avoid an excessive temperature rise of the selected drive source and occurrence of thermal damage associated therewith.

(M) In the third embodiment and the modification example (l), the discharge amount restriction process may be executed for the pump corresponding to the selected drive source, and the other pump may be stopped.
(N) In the modified example (m), this may be omitted for the discharge amount limiting process of the pump corresponding to the selected drive source.

  (O) In the third embodiment, when the leakage of cooling water is predicted for both the mechanical drive system and the circulating water channels 17 and 26 of the electric drive system, both the internal combustion engine 11 and the motor generator 21 are used as the drive sources. However, the operation of the internal combustion engine 11, the motor generator 21, the mechanical drive system, and the pumps 12 and 23 of the electric drive system may be stopped. In other words, both the drive sources of the mechanical drive system and the electric drive system and the pumps 12 and 23 of the cooling units 10 and 20 may be stopped.

  (P) Although the hybrid vehicle in which the internal combustion engine 11 and the motor generator 21 can be selected as the drive source has been described in the above embodiment, the present invention can also be applied to a vehicle on which only the internal combustion engine 11 is mounted as the drive source. At this time, when leakage of the cooling water is predicted in the circulating water passage 17 of the cooling water, the discharge amount limiting process for limiting the discharge amount of the pump 12 can be executed and the operating load of the internal combustion engine 11 can be limited.

(Q) In the modified example (p), the operation of the pump 12 may be stopped as the discharge amount limiting process of the pump 12.
(R) In the modified example (p) or (q), when the leakage of the cooling water is predicted from the cooling water circulation channel 17, the operating load of the internal combustion engine 11 is reduced. You may make it do.

  (S) In the modified examples (q) to (r), the present invention is applied to a vehicle in which only the internal combustion engine 11 is mounted as a drive source, but only the motor generator 21 is mounted as a drive source instead of the internal combustion engine 11. It can also be applied to vehicles. That is, when leakage of the cooling water is predicted for the circulating water passage 26 of the electric drive system, the discharge amount of the pump 23 is limited, the operation load of the motor generator 21 is limited, the discharge amount of the pump 23 is limited, and the motor 23 is electrically driven. This can be implemented in such a manner that the operating load of the generator 21 is limited.

  (T) In the first embodiment and each of the modified examples related thereto, the detection value of the acceleration sensor 94 is equal to or greater than a predetermined determination value, and the activation of the airbag device 41 is detected as a specific event. Further, it may be detected as a specific event that the detection value of the acceleration sensor 94 is equal to or greater than a predetermined threshold value. Alternatively, it may be detected as a specific event that the vehicle is determined to be in an inevitable state of collision based on a detection value of a millimeter wave radar sensor (not shown). According to this modified example, even when an impact force acts on the vehicle and the probability that the circulating water channels 17 and 26 are likely to leak cooling water increases, this can be appropriately predicted. A large amount of cooling water can be prevented from leaking from the circulation water channels 17 and 26. In addition, the airbag device 41 is also activated by another occupant protection device triggered by the impact force applied to the vehicle, such as a seat belt device that temporarily restrains the occupant by winding up and fixing the seat belt. Can be substituted for this.

  (U) In the second embodiment, the third embodiment, and the respective modifications related thereto, the circulation channel is compared by comparing the deviation between the actual rotational speed of the pump and the target rotational speed and the determination value. A specific event that predicts leakage of cooling water from the vehicle is detected. For example, the deviation is a ratio between the actual rotational speed and the target rotational speed, such as a value indicating the degree of divergence between them and a determination according to the deviation. The specific event can also be detected through comparison with a value.

  (V) In each of the above-described embodiments and their modifications, an electric rotary pump is used as the mechanical drive pump 12, but an engine-driven pump capable of changing the discharge amount can also be adopted. . For example, a pump in which the rotating shaft is drivingly connected to the output shaft of the internal combustion engine 11 through a clutch, and a pump that switches between a state in which cooling water is discharged and a state in which discharge is stopped by engaging / disengaging the clutch is employed. You can also.

  (W) In each of the above-described embodiments and modifications, as the circulating water passage through which the cooling water of the electric drive system circulates, the motor generator 21 and the inverter 22 that is the power control device thereof are cooled. Also, the circulating water channel includes one that cools only the motor generator 21 and one that cools only the power control device such as an inverter. In the case of the assembled motor generator 21, the circulating water channel includes a part that cools a part that functions as a motor, a part that cools a part that functions as a generator, and a part that cools the whole part. In addition, when the electric motor and the generator are mounted on the vehicle as separate bodies, those that cool only the electric motor, those that cool only the electric generator, and those that cool both the electric motor and the electric generator are also this circulation channel. include.

  DESCRIPTION OF SYMBOLS 10 ... Cooling part, 11 ... Internal combustion engine, 12 ... Pump, 14 ... Radiator, 16 ... Water jacket, 17 ... Circulating water channel, 20 ... Cooling part, 21 ... Motor generator, 22 ... Inverter, 23 ... Pump, 24 ... Radiator , 25 ... storage battery, 26 ... circulating water channel, 31 ... power split mechanism, 33 ... drive wheel, 41 ... airbag device, 91 ... control device, 92 ... rotational speed sensor, 93 ... rotational speed sensor, 94 ... acceleration sensor.

Claims (17)

A circulating water passage through which cooling water for cooling a vehicle drive system including a vehicle drive source circulates, a pump that discharges and circulates cooling water into the circulating water passage, and a pump control means that variably controls the discharge amount of the pump. In a control device for a vehicle having a cooling device including:
Detecting means for detecting a specific event in which leakage of cooling water from the circulation channel is predicted;
The vehicle control apparatus, wherein the pump control means executes a discharge amount restriction process for restricting a discharge amount of the pump when the specific event is detected. The vehicle control device according to claim 1, wherein the detection unit includes a sensor that detects an impact force acting on the vehicle, and detects that the impact force detected by the sensor is equal to or greater than a predetermined threshold as the specific event. . The detection means includes an acceleration sensor provided in the vehicle as the sensor, and detects that the acceleration detected by the acceleration sensor is equal to or greater than a predetermined threshold value for starting the vehicle occupant protection device as the specific event. The vehicle control device according to claim 2. The vehicle control device according to claim 1, wherein the detection unit detects that the vehicle occupant protection device is activated as the specific event. The pump is an electric rotary pump,
The pump control means includes a rotation speed sensor for detecting the rotation speed of the pump, and a reference control value set in advance corresponding to the target rotation speed so that the detected rotation speed becomes the target rotation speed. Controlling the pump based on
When the detecting means controls the pump based on the reference control value, the rotational speed detected by the rotational speed sensor is higher than the target rotational speed, and the deviation is not less than a predetermined determination value. The vehicle control device according to claim 1, wherein the vehicle is detected as the specific event. The vehicle control device according to claim 5, wherein the detection unit sets the determination value to a larger value as the target rotational speed is higher. In the vehicle control apparatus according to any one of claims 1 to 6,
Drive source control means for executing an operation load limiting process for limiting the operation load of the drive source so that the amount of heat generated when the drive source is operated is reduced when the specific event is detected, A vehicle control device. A circulating water passage through which cooling water for cooling a mechanical drive system including an internal combustion engine as a vehicle driving source circulates and a circulating water passage through which cooling water for cooling an electric driving system including a motor generator as a vehicle driving source circulates. A pair of independent circulation channels, a pair of pumps provided separately for each circulation channel and discharging cooling water to the circulation channels, and a pump control means for variably controlling the discharge amount of the pumps. In a control device for a vehicle having a cooling device including:
Detecting means for detecting a specific event where leakage of cooling water from each circulation channel is predicted;
The vehicle control device, wherein the pump control means executes a discharge amount restriction process for restricting a discharge amount of at least one of the pumps when the specific event is detected. The vehicle control device according to claim 8, wherein the detection unit includes a sensor that detects an impact force acting on the vehicle, and detects that the impact force detected by the sensor is equal to or greater than a predetermined threshold as the specific event. . 9. The detection means includes an acceleration sensor provided in a vehicle, and detects that the acceleration detected by the acceleration sensor is equal to or greater than a predetermined determination value for starting an occupant protection device of the vehicle as the specific event. The vehicle control device described in 1. The vehicle control device according to claim 8, wherein the detection unit detects that the vehicle occupant protection device is activated as the specific event. The pump control means is for stopping the discharge of the cooling water by the pump of the circulating water passage of the mechanical drive system during the discharge amount limiting process,
The vehicle control device according to any one of claims 8 to 11, further comprising selection means for stopping operation of the internal combustion engine and selecting only a motor generator as a vehicle drive source. The pump control means further restricts the discharge amount while driving the pump in the circulating water passage of the electric drive system during the discharge amount restriction process,
The vehicle control device according to claim 12, further comprising drive source control means for limiting the supply power supplied to the motor generator so as to be equal to or less than a predetermined value. Each of the pumps is an electric rotary pump,
The pump control means includes a separate rotational speed sensor for detecting the rotational speed of each pump, and the target rotational speed is set so that each detected rotational speed becomes a target rotational speed corresponding to each pump. Control each pump based on a reference control value set in advance corresponding to the speed,
The detection means detects a rotational speed detected by each rotational speed sensor when the pumps are controlled based on a reference control value set in advance corresponding to the target rotational speed, and is higher than the target rotational speed. The degree of deviation is not less than a predetermined determination value, and is detected for each of the circulation channels as the specific event,
When the specific event is not detected only in one of the circulating water channels of the mechanical drive system and the electric drive system, further comprising a selection means for selecting only one of them as a vehicle drive source,
The vehicle control device according to claim 8, wherein the pump control unit is configured to stop discharge of cooling water by a pump of a circulating water channel in the other of the mechanical drive system and the electric drive system in the discharge amount limiting process. Each of the pumps is an electric rotary pump,
The pump control means includes a separate rotational speed sensor for detecting the rotational speed of each pump, and the target rotational speed is set so that each detected rotational speed becomes a target rotational speed corresponding to each pump. Control each pump based on a reference control value set in advance corresponding to the speed,
The detection means detects a rotational speed detected by each rotational speed sensor when the pumps are controlled based on a reference control value set in advance corresponding to the target rotational speed, and is higher than the target rotational speed. The degree of deviation is not less than a predetermined determination value, and is detected for each of the circulation channels as the specific event,
The system further comprises selection means for selecting both the internal combustion engine and the motor generator as a vehicle drive source when the specific event is detected for each of the circulation channels of the mechanical drive system and the electric drive system,
9. The vehicle according to claim 8, wherein the pump control unit is configured to limit the discharge amount while driving each pump of the circulation channel in both the mechanical drive system and the electric drive system in the discharge amount restriction process. Control device. The vehicle according to claim 15, further comprising drive source control means for executing an operation load limiting process for limiting an operation load of the drive source so as to reduce a generated heat amount when the internal combustion engine and the motor generator are operated. Control device. The vehicle control device according to any one of claims 14 to 16, wherein the detection unit sets the determination value to a larger value as the target rotational speed is higher.

Images