JP3949598B2 - Control device for hybrid vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for a hybrid vehicle driven by an internal combustion engine and a motor.
[0002]
[Prior art]
Conventionally, for example, a switching means for switching on / off of a vehicle air conditioner depending on whether or not the temperature of cooling water for cooling an engine has exceeded a predetermined determination threshold temperature, the predetermined determination threshold temperature is set to a traveling state of the vehicle. In addition, a vehicle air conditioner (see, for example, Patent Document 1) that is set according to the load state of the engine is known.
[0003]
[Patent Document 1]
JP-A-9-48233
[0004]
[Problems to be solved by the invention]
However, according to the vehicle air conditioner according to the above prior art, since the vehicle air conditioner is switched on / off according to the temperature of the cooling water, the vehicle air conditioner unexpectedly occurs at an unexpected timing. There is a case where the device is stopped, and drivability may be deteriorated when the running state of the vehicle is changed as the vehicle air conditioner is stopped.
The present invention has been made in view of the above circumstances, and provides a control device for a hybrid vehicle capable of suppressing a decrease in drivability while ensuring an appropriate cooling capacity in a cooling circuit. Objective.
[0005]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, a hybrid vehicle control device according to a first aspect of the present invention includes a motor that is a driving source of a vehicle together with an internal combustion engine, and supplies electric power to the motor. An inverter, a cooling circuit for circulating the internal combustion engine and a refrigerant for cooling the inverter, and at least one of the internal combustion engine or the motor is connected to a drive wheel by an operation of a vehicle occupant, A control device for a hybrid vehicle including a transmission (for example, the manual transmission 13 in the embodiment) that transmits a driving force via the vehicle, the vehicle speed and a load state of the internal combustion engine (for example, implementation) Temperature region setting means for setting a temperature increase region and a temperature decrease region related to a temperature state predicted for the inverter according to the intake pipe negative pressure Pb) in the form of For example, the control unit 47) in the embodiment, a notification means (for example, a notification device 48 in the embodiment) for prompting a vehicle occupant to execute a shift operation for switching the transmission to a higher gear side, and the speed And a notification actuating means (for example, step S10 in the embodiment) that activates the notifying means when the detected value of the load state belongs to the temperature increase region.
[0006]
According to the hybrid vehicle control device having the above-described configuration, the temperature region setting means is a temperature state predicted for the inverter according to the vehicle speed and the load state of the internal combustion engine (for example, intake pipe negative pressure). For example, a temperature rise region in which it is determined that there is a possibility that the temperature of the inverter will increase beyond a predetermined level in the future, and a temperature at which it is determined that there is no possibility that the temperature of the inverter will increase beyond a predetermined level Set the descending area. The notification actuating means prevents the inverter temperature from rising beyond a predetermined level in the future when the detected values of the vehicle speed and the load state of the internal combustion engine belong to the temperature rise region. Then, the notifying means is operated to prompt the vehicle occupant to execute a shift operation for switching the transmission to the high speed side, that is, the reduction speed ratio side.
Thereby, for example, the temperature rise of the inverter can be predicted at a timing before the inverter temperature actually exceeds a predetermined level, and the occurrence of an actual excessive temperature rise can be suppressed. In addition, since the speed change operation for suppressing the temperature rise of the inverter is performed by a vehicle occupant (for example, a driver), it is possible to prevent unexpected fluctuations in the driving state that the vehicle occupant does not expect. can do.
[0007]
Also, The present invention The control apparatus for a hybrid vehicle includes a motor that is used as a drive source of the vehicle together with the internal combustion engine, an inverter that supplies electric power to the motor, a cooling circuit that distributes the refrigerant that cools the internal combustion engine and the inverter, A transmission that connects at least one of the internal combustion engine or the motor to a drive wheel by operation of an occupant and transmits a driving force via any one of a plurality of shift stages (for example, a manual transmission in an embodiment) 13) a control device for a hybrid vehicle comprising: a notification means (for example, a notification device 48 in the embodiment) for urging a vehicle occupant to execute a shift operation for switching the transmission to a high gear side; Notification operating means (for example, implementation) that operates the notification means in accordance with the temperature rise state of the refrigerant (for example, the cooling water temperature increase rate (dTwp / dt) in the embodiment). Characterized in that it comprises the step S10) and in state.
[0008]
According to the control apparatus for a hybrid vehicle having the above-described configuration, the notification operating unit is based on the state of the refrigerant temperature rising. For example, when the rate of increase in the refrigerant temperature per unit time exceeds a predetermined rate, the inverter In order to prevent the temperature of the vehicle from rising beyond a predetermined level in the future, the notification means is operated, and a shift operation for switching the transmission to the high speed side, that is, the reduction speed ratio side, is performed to the vehicle occupant. Prompt.
Thereby, for example, the temperature rise of the inverter can be predicted at a timing before the inverter temperature actually exceeds a predetermined level, and the occurrence of an actual excessive temperature rise can be suppressed. In addition, since the speed change operation for suppressing the temperature rise of the inverter is performed by a vehicle occupant (for example, a driver), it is possible to prevent unexpected fluctuations in the driving state that the vehicle occupant does not expect. can do.
[0009]
further, Claim 2 The control device for a hybrid vehicle according to the present invention includes an air conditioner capacitor provided in an air conditioner at a position facing a radiator provided in the cooling circuit, and the temperature of the refrigerant (for example, in the embodiment). Of the coolant temperature Twp) is equal to or higher than a predetermined first set temperature (for example, the first set temperature # Twp1 in the embodiment). When the temperature of the refrigerant (for example, the cooling water temperature Twp in the embodiment) is higher than the first set temperature (for example, the second set temperature in the embodiment). # Twp2) The operation switching means (for example, step S07 in the embodiment) for reducing the output of the air conditioner at the time of the above is provided.
[0010]
In the control apparatus for a hybrid vehicle having the above configuration, the radiator is heated by the exhaust heat exhausted from the air conditioner condenser due to the opposing arrangement of the air conditioner condenser and the radiator, and the cooling capacity by the refrigerant is reduced. However, it is possible to suppress the occurrence of excessive temperature rise in the inverter by operating the notification means when the temperature of the refrigerant is equal to or higher than the predetermined first set temperature.
Moreover, the radiator is heated by the exhaust heat exhausted from the condenser for the air conditioner by reducing the output of the air conditioner when the temperature of the refrigerant is equal to or higher than the predetermined second set temperature higher than the first set temperature. This can suppress the occurrence of excessive temperature rise in the inverter.
[0011]
further, Claim 3 The control apparatus for a hybrid vehicle according to the present invention described in the third embodiment has a predetermined third set temperature (for example, the embodiment) in which the temperature of the refrigerant (for example, the cooling water temperature Twp in the embodiment) is higher than the second set temperature. The first stop means (for example, step S05 in the embodiment) for stopping the operation of the air conditioner when the temperature is equal to or higher than the third set temperature # Twp3) and the temperature related to the inverter (for example, in the embodiment) The switching operation of the inverter is stopped when the element temperature Tj or the substrate temperature Tcb) is equal to or higher than a predetermined fourth set temperature (for example, the predetermined temperature #Tj or the predetermined temperature #Tcb in the embodiment). And stop means (for example, step S02 in the embodiment).
[0012]
According to the hybrid vehicle control device having the above configuration, when the temperature of the refrigerant is equal to or higher than the predetermined third set temperature higher than the second set temperature, the operation of the air conditioner is stopped, so that the refrigerant is discharged from the air conditioner capacitor. Therefore, it is possible to prevent the radiator from being heated by exhaust heat, and to prevent an excessive increase in temperature of the inverter due to exhaust heat from the condenser for the air conditioner.
In addition, the switching operation of the inverter is stopped when the temperature of the inverter, for example, the temperature of the switching element provided in the inverter or the temperature of the circuit board is equal to or higher than a predetermined fourth set temperature, resulting from the operation of the inverter. The occurrence of temperature rise can be prevented, and for example, the inverter can be prevented from being damaged by overheating.
[0013]
further, The present invention The hybrid vehicle control device operates the notifying means when a state where the rotational speed of the internal combustion engine is equal to or higher than a predetermined rotational speed continues for a predetermined time (for example, a predetermined duration #Tne in the embodiment). It is characterized by comprising rotation speed-informing notification operating means (for example, step S10 in the embodiment also serves as).
[0014]
According to the hybrid vehicle control device having the above configuration, the temperature of the cooling water for cooling the internal combustion engine and the inverter exceeds a predetermined level by operating the notification means according to the duration of the predetermined load state of the internal combustion engine. Can be prevented, and the inverter can be prevented from being overheated.
[0015]
further, The present invention The hybrid vehicle control device includes an operation switching means that reduces the output of the air conditioner when the rotational speed of the internal combustion engine is equal to or higher than a predetermined speed for a predetermined time or longer (for example, the control unit in the embodiment). 47).
[0016]
According to the hybrid vehicle control device having the above-described configuration, excessive output of the inverter caused by the exhaust heat from the condenser for the air conditioner is reduced by reducing the output of the air conditioner according to the duration of the predetermined load state of the internal combustion engine. The occurrence of temperature rise can be suppressed.
[0017]
Claim 4 The hybrid vehicle control apparatus according to the present invention includes a motor that is used as a drive source of the vehicle together with the internal combustion engine, an inverter that supplies electric power to the motor, and a cooling that circulates the internal combustion engine and a refrigerant that cools the inverter. A control device for a hybrid vehicle including a circuit, which is predicted for the inverter according to a vehicle speed and a load state of the internal combustion engine (for example, intake pipe negative pressure Pb in the embodiment). Temperature region setting means (for example, the control unit 47 in the embodiment) for setting a temperature increase region and a temperature decrease region related to the temperature state, and when the detected values of the speed and the load state belong to the temperature increase region An operation switching means for reducing the output of the air conditioner (for example, also serving as the control unit 47 in the embodiment) is provided.
[0018]
According to the hybrid vehicle control device having the above-described configuration, the temperature region setting means is a temperature state predicted for the inverter according to the vehicle speed and the load state of the internal combustion engine (for example, intake pipe negative pressure). For example, a temperature rise region in which it is determined that there is a possibility that the temperature of the inverter will increase beyond a predetermined level in the future, and a temperature at which it is determined that there is no possibility that the temperature of the inverter will increase beyond a predetermined level Set the descending area. The operation switching means prevents the inverter temperature from rising beyond a predetermined level in the future when the detected values of the vehicle speed and the load state of the internal combustion engine belong to the temperature increase region. Therefore, the output of the air conditioner is reduced to suppress the occurrence of an excessive temperature rise of the inverter due to the exhaust heat from the condenser for the air conditioner.
Thereby, for example, the temperature rise of the inverter can be predicted at a timing before the inverter temperature actually exceeds a predetermined level, and the occurrence of an actual excessive temperature rise can be suppressed.
[0019]
further, The present invention The hybrid vehicle control apparatus includes a motor that serves as a driving source of the vehicle together with the internal combustion engine, an inverter that supplies electric power to the motor, and a cooling circuit that circulates the internal combustion engine and a refrigerant that cools the inverter. A vehicle control device, which is an operation switching means (for example, implementation) that reduces the output of the air conditioner according to the temperature rise state of the refrigerant (for example, the cooling water temperature rise rate (dTwp / dt) in the embodiment). The control unit 47 in the form of (2) also serves as a feature.
[0020]
According to the control apparatus for a hybrid vehicle having the above-described configuration, the notification operating unit is based on the state of the refrigerant temperature rising. For example, when the rate of increase in the refrigerant temperature per unit time exceeds a predetermined rate, the inverter In order to prevent the temperature of the inverter from rising beyond a predetermined level in the future, the output of the air conditioner will be reduced and the occurrence of excessive temperature rise of the inverter due to the exhaust heat from the condenser for the air conditioner Suppress.
Thereby, for example, the temperature rise of the inverter can be predicted at a timing before the inverter temperature actually exceeds a predetermined level, and the occurrence of an actual excessive temperature rise can be suppressed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a control apparatus for a hybrid vehicle of the present invention will be described with reference to the accompanying drawings.
A hybrid vehicle control device 10 according to an embodiment of the present invention is mounted on a hybrid vehicle 1 as shown in FIG. 1, for example. In the hybrid vehicle 1, for example, an internal combustion engine 11 and a traveling motor 12 are connected. Both driving forces are transmitted to the drive wheels W via the manual transmission 13.
The motor 12 generates an auxiliary driving force that assists the driving force of the internal combustion engine 11 in accordance with the operating state of the hybrid vehicle 1. Further, when the driving force is transmitted from the wheel W side to the motor 12 side during deceleration of the hybrid vehicle 1, the motor 12 functions as a generator to generate a so-called regenerative braking force, and recovers the kinetic energy of the vehicle body as electric energy. To do.
Regenerative operation and driving of the motor 12 are performed by a PDU (power drive unit) 14 in response to a control command from a motor control device (not shown). The PDU 14 includes an inverter formed by bridge-connecting switching elements including a plurality of transistors, for example, and is connected to a power storage device 15 including a high-voltage battery and the like that exchange electric energy with the motor 12.
[0022]
Here, as will be described later, the internal combustion engine 11 and the PDU 14 are connected to the same cooling circuit 21 and cooled by the same cooling water. The cooling circuit 21 includes, for example, a water pump 31, a heater core 32, and a radiator. 33, a thermostat 34, and a reservoir tank 35.
The hybrid vehicle control apparatus 10 according to the present embodiment includes, for example, an air conditioner 46 including a compressor 42, an air conditioner condenser 43, an expansion valve 44, and an evaporator 45 connected to the internal combustion engine 11 via a clutch 41. And the control part 47 and the alerting | reporting apparatus 48 are comprised.
[0023]
In the cooling circuit 21 that cools the internal combustion engine 11 and the PDU 14 with the same cooling water, for example, as shown in FIG. 2, a refrigerant flow path (not shown) of the PDU 14 and a water jacket 11 a inside the internal combustion engine 11 are connected in series. Then, the water pump 31 driven by the internal combustion engine 11 causes cooling water, which is a refrigerant, to flow from the refrigerant flow path of the PDU 14 to the water jacket 11a.
The relatively high-temperature cooling water after cooling the PDU 14 and the internal combustion engine 11 is introduced into the heater core 32 through, for example, a water valve 32a and also introduced into the radiator 33 in accordance with the operating state of the thermostat 34. ing.
In addition, the water temperature sensor 11b which detects the temperature (cooling water temperature) Twp of cooling water is arrange | positioned at the discharge port of the water jacket 11a.
[0024]
The heater core 32 heats air using a relatively high-temperature cooling water as a heat source, and recirculates the heat-exchanged cooling water to the water pump 31.
The thermostat 34 changes from a closed state to an open state when the temperature of the cooling water (cooling water temperature) Twp is in a high temperature state exceeding a predetermined temperature, and the relatively high temperature cooling water discharged from the water jacket 11a is supplied to the radiator. The cooling water introduced to 33 and cooled by the radiator 33 is circulated to the water pump 31.
[0025]
The thermostat 34 is a bypass that allows the coolant discharged from the water jacket 11a to flow around the radiator 33 and flow to the water pump 31 when the thermostat 34 is in a closed state, for example, when the internal combustion engine 11 is started. A flow path 21a is connected. That is, when the thermostat 34 is in a closed state with respect to the flow path connected to the radiator 33, the bypass flow path 21 a is set in an open state, while when the thermostat 34 is in an open state with respect to the flow path connected to the radiator 33. The bypass channel 21a is closed.
A reservoir tank 35 is connected to the radiator 33, and cooling water stored in the reservoir tank 35 is introduced into the cooling circuit 21. Further, the thermostat 34 is provided with a thermo switch 36 and operates a radiator cooling fan (not shown) when the temperature of the cooling water rises, for example, in a traffic jam.
[0026]
In the air conditioner 46, for example, as shown in FIG. 1, the gaseous refrigerant adiabatically compressed by the compressor 42 driven by the internal combustion engine 11 is pumped to the air conditioner condenser 43.
The air conditioner condenser 43 is disposed, for example, opposite to the radiator 33 of the cooling circuit 21, and cools the gaseous refrigerant into a condensed liquid. The refrigerant liquefied by the air conditioner condenser 43 is adiabatically expanded by the expansion valve 44 to be a relatively low temperature and low pressure gas or mist, and further, in the evaporator 45, Vaporized by heat exchange. The vaporized refrigerant vaporized by the evaporator 45 is again introduced into the compressor 42. By repeatedly executing such a refrigeration cycle, the air in the passenger compartment is dehumidified and cooled by the latent heat of vaporization of the refrigerant.
For example, the air conditioner condenser 43 is provided with a cooling fan 43a, and the evaporator 45 is provided with a blower fan 45a.
[0027]
As will be described later, the control unit 47 operates the vehicle 1, for example, the speed (vehicle speed) V of the vehicle 1, the intake pipe negative pressure Pb, the rotational speed Ne of the internal combustion engine 11, and the cooling water flowing through the cooling circuit 21. Based on the temperature (cooling water temperature) Twp, the temperature outside the vehicle (outside temperature) Ta, and the like, it is predicted and determined whether or not the PDU 14 may be overheated beyond a predetermined level. When the determination result is “YES”, that is, when it is determined that the PDU 14 may be overheated beyond a predetermined level, for example, by a notification device 48 that performs appropriate display, lighting, sound output, and the like. Instructing the vehicle occupant to execute a shift operation for switching the manual transmission 13 to the reduction speed ratio side (that is, the high speed side of the plurality of shift speeds), or controlling the opening degree of the expansion valve 44, for example. Then, the output of the air conditioner 46 is reduced to switch to the low output operation.
Here, when the manual transmission 13 is switched to the high speed side, the rotational speed Ne of the internal combustion engine 11 decreases, thereby suppressing an increase in the cooling water temperature Twp in the cooling circuit 21 or reducing the cooling water temperature Twp. , Overheating of the PDU 14 is suppressed. Furthermore, when the rotational speed Ne of the internal combustion engine 11 decreases, the rotational speed of the compressor 42 of the air conditioner 46 decreases, and when the output of the air conditioner 46 decreases, the amount of exhaust heat from the air conditioner condenser 43 decreases. As a result, the radiator 33 of the cooling circuit 21 disposed opposite to the air conditioner condenser 43 is prevented from being heated by exhaust heat from the air conditioner condenser 43, and the cooling capacity of the cooling circuit 21 is reduced. This can be suppressed.
[0028]
Further, for example, when the cooling water temperature Twp rises to a predetermined temperature or more, the control unit 47 sets the clutch 41 to a disengaged state and stops the operation of the air conditioner 46, as will be described later. The radiator 33 of the cooling circuit 21 is prevented from being heated by the exhaust heat from the condenser 43.
For example, when the temperature (element temperature) Tj of the switching element provided in the PDU 14 or the temperature (substrate temperature) Tcb of the circuit board provided in the PDU 14 rises to a predetermined temperature or higher, the control unit 47 is described later. As described above, the switching operation of the PDU 14 is stopped, or the power supply to the circuit board provided in the PDU 14 is stopped.
[0029]
For this reason, the control unit 47 includes, for example, a detection signal that is disposed at the outlet of the water jacket 11a and that is output from the water temperature sensor 11b that detects the temperature (cooling water temperature) Twp of the cooling water, and a switching element provided in the PDU 14. A detection signal output from the element temperature sensor 14a for detecting the temperature (element temperature) Tj of the circuit board, and a detection signal output from the substrate temperature sensor 14b for detecting the temperature (substrate temperature) Tcb of the circuit board included in the PDU 14. A detection signal output from an outside air temperature sensor 51 that detects an air temperature outside the vehicle (outside air temperature) Ta, a detection signal output from a vehicle speed sensor 13a that detects a speed (vehicle speed) V of the vehicle 1, and the internal combustion engine 11 The detection signal output from the rotation speed sensor 11c that detects the rotation speed Ne of the intake pipe and the intake pipe negative pressure sensor 11d that detects the intake pipe negative pressure Pb. A detection signal output is input.
[0030]
The hybrid vehicle control device 10 according to the present embodiment has the above-described configuration. Next, the operation of the hybrid vehicle control device 10 will be described with reference to the accompanying drawings.
[0031]
First, in step S01 shown in FIG. 3, whether or not the element temperature Tj is equal to or higher than a predetermined temperature #Tj (for example, 150 ° C.) or the substrate temperature Tcb is a predetermined temperature #Tcb (for example, 120 ° C.). It is determined whether or not.
If this determination is “NO”, the flow proceeds to step S 04 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S 02.
In step S02, the switching operation of the switching element provided in PDU 14 is stopped. In step S03, the power supply to the circuit board provided in the PDU 14 is shut off, and the series of processing ends.
[0032]
In step S04, it is determined whether or not the coolant temperature Twp is equal to or higher than a predetermined third set temperature # Twp3 (for example, 110 ° C.).
If this determination is “NO”, the flow proceeds to step S 06 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S 05, the operation of the air conditioner 46 is stopped, and the series of processes is ended.
[0033]
In step S06, it is determined whether or not the coolant temperature Twp is equal to or higher than a predetermined second set temperature # Twp2 (for example, 105 ° C.) lower than a predetermined third set temperature # Twp3.
If this determination is “NO”, the flow proceeds to step S 08 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S 07, the output of the air conditioner 46 is reduced, the operation is switched to a predetermined low output operation, and the series of processes is terminated.
[0034]
In step S08, it is determined whether the coolant temperature Twp is equal to or higher than a predetermined first set temperature # Twp1 (for example, 95 ° C.) lower than a predetermined second set temperature # Twp2.
When the determination result is “NO”, the series of processes is terminated.
On the other hand, if this determination is “YES”, the flow proceeds to step S 09.
In step S09, for example, based on a predetermined overheat prediction table as shown in FIG. 4 or the like, the duration Tt that is the state of the temperature rise region in which it is determined that the PDU 14 may overheat beyond a predetermined degree is It is determined whether or not a predetermined duration #Tt or longer.
[0035]
For example, in the predetermined overheat prediction table shown in FIG. 4, for example, two temperature rising regions α and temperature falling regions β are set according to the vehicle speed V and the load state of the vehicle 1, for example, the intake pipe negative pressure Pb. The boundary b between the temperature increase region α and the temperature decrease region β is set so as to change according to the outside air temperature Ta, for example.
Here, the temperature increase region α is a state in which it is determined that the PDU 14 is likely to be overheated exceeding a predetermined level, and the temperature decrease region β is determined to be a risk that the PDU 14 is not overheated beyond a predetermined level. For example, a state where the vehicle speed V is relatively low and the intake pipe negative pressure Pb is relatively large is the temperature increase region α, while, for example, the vehicle speed V is relatively large. In addition, a state where the intake pipe negative pressure Pb is relatively small is the temperature decrease region β.
Then, in the plane having the vehicle speed V and the intake pipe negative pressure Pb as orthogonal axes, the higher the outside air temperature Ta, the larger the temperature rising region α as compared with the temperature decreasing region β, and the higher vehicle speed V or smaller. It is determined that the intake pipe negative pressure Pb may cause the PDU 14 to overheat beyond a predetermined level.
[0036]
If the determination result in step S09 is “YES”, the process proceeds to step S10, and the notification device 48 instructs the vehicle occupant to execute a shift operation for switching the manual transmission 13 to the high gear side. Terminate the process.
On the other hand, if the determination result in step S09 is “NO”, the process proceeds to step S11.
In step S11, it is determined whether or not the duration Tne in which the rotational speed Ne of the internal combustion engine 11 is equal to or higher than a predetermined rotational speed is equal to or longer than a predetermined continuous time #Tne.
If the determination result in step S11 is “YES”, the process proceeds to step S10 described above.
On the other hand, if the determination result in step S11 is “NO”, the series of processes is terminated.
[0037]
According to the control apparatus 10 for a hybrid vehicle according to the present embodiment, in the cooling circuit 21, the refrigerant flow path of the PDU 14 and the water jacket 11a of the internal combustion engine 11 are connected in series with respect to the circulation of the cooling water, and the cooling is performed. By arranging the radiator 33 of the circuit 21 and the air conditioner condenser 43 of the air conditioner 46 to face each other, the PDU 14 is overheated even when the radiator 33 is heated by the exhaust heat from the air conditioner condenser 43. It is possible to reliably prevent the PDU 14 from being damaged by overheating.
That is, when the cooling water temperature Twp rises to a predetermined first set temperature # Twp1 or more, it is predicted and determined whether or not the PDU 14 may be overheated beyond a predetermined level, and there is a possibility of overheating. By instructing the execution of the shift operation for switching the manual transmission 13 to the higher gear side, it is possible to prevent the PDU 14 from being actually overheated beyond a predetermined level. Further, in this case, by causing the driver of the vehicle 1 to execute the speed change operation, it is possible to prevent the occupant of the vehicle 1 from changing the driving state unexpectedly and to prevent drivability from being lowered. can do.
[0038]
When the cooling water temperature Twp rises to a predetermined second set temperature # Twp2 higher than the predetermined first set temperature # Twp1, the air conditioner 46 is switched to the low output operation, for example, driving of the vehicle 1 Even when the person ignores the execution instruction of the shift operation or when the outside air temperature Ta is relatively high, for example, the radiator 33 of the cooling circuit 21 is heated by the exhaust heat from the condenser 43 for the air conditioner. It can suppress that the cooling effect | action with respect to PDU14 reduces.
Further, when the cooling water temperature Twp rises to a predetermined third set temperature # Twp3 higher than the predetermined second set temperature # Twp2, the cooling action on the PDU 14 is reduced by stopping the operation of the air conditioner 46. Can be prevented.
Furthermore, by stopping the switching operation of the PDU 14 and energization of the circuit board provided in the PDU 14 according to the element temperature Tj and the substrate temperature Tcb, an increase in the cooling water temperature Twp is not detected due to, for example, leakage of the cooling water. Even in this case, it is possible to reliably prevent the PDU 14 from being damaged by overheating.
[0039]
In the above-described embodiment, it is determined in step S09 whether or not the duration Tt in the temperature rise region corresponding to the vehicle speed V and the intake pipe negative pressure Pb is equal to or longer than the predetermined duration #Tt. For example, instead of this step S09, the rate of increase of the cooling water temperature Twp per unit time, that is, the cooling water temperature increase rate (dTwp / dt), as in step S20 shown in FIG. It may be determined whether or not it is equal to or higher than the ascending speed # (dTwp / dt).
[0040]
In the above-described embodiment, in step S10, the vehicle occupant is instructed to perform a shift operation for switching the manual transmission 13 to the high gear side. However, the present invention is not limited to this. The output may be reduced and switched to a predetermined low output operation. In this case, for example, when the cooling water temperature Twp rises from the first set temperature # Twp1 to the second set temperature # Twp2 by setting to operate at a higher output than the low output operation in step S07. The output of the air conditioner 46 is reduced step by step.
[0041]
In the above-described embodiment, the manual transmission 13 may transmit power using a plurality of gears, or may include a plurality of pulleys instead of the gears, and may be powered by a belt or the like suspended between the pulleys. May be transmitted.
[0042]
In the above-described embodiment, the driving forces of both the internal combustion engine 11 and the traveling motor 12 are transmitted to the drive wheels W via the manual transmission 13, but the present invention is not limited to this. The driving force may be transmitted via an automatic transmission having a manual shift mode in which the gear position can be arbitrarily selected by the operation of the occupant. In this case, the same effect as that of the above-described embodiment can be obtained. it can.
[0043]
【The invention's effect】
As described above, according to the control apparatus for a hybrid vehicle of the present invention, for example, the temperature rise of the inverter is predicted at a timing before the inverter temperature actually rises beyond a predetermined level, The occurrence of actual excessive temperature rise can be suppressed. In addition, since the speed change operation for suppressing the temperature rise of the inverter is performed by a vehicle occupant (for example, a driver), it is possible to prevent unexpected fluctuations in the driving state that the vehicle occupant does not expect. can do.
[0044]
further, Claim 2 or claim 3 According to the control device for a hybrid vehicle of the present invention described in the above, even when the radiator is heated by the exhaust heat discharged from the condenser for the air conditioner and the cooling capacity by the refrigerant is lowered, the temperature of the refrigerant is a predetermined temperature. By operating the notification means when the temperature is equal to or higher than the first set temperature, it is possible to suppress the occurrence of an excessive temperature rise in the inverter.
In addition, by reducing the output of the air conditioner when the temperature of the refrigerant is equal to or higher than a predetermined second set temperature higher than the first set temperature, it is possible to further suppress the occurrence of excessive temperature rise in the inverter. it can.
[0045]
further, The present invention According to this hybrid vehicle control device, the temperature of the cooling water for cooling the internal combustion engine and the inverter rises beyond a predetermined level by operating the notification means according to the duration of the predetermined load state of the internal combustion engine. It is possible to prevent the inverter from being overheated.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a control apparatus for a hybrid vehicle according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a cooling circuit shown in FIG. 1;
FIG. 3 is a flowchart showing the operation of the hybrid vehicle control device shown in FIG. 1;
FIG. 4 is a graph showing a temperature increase region α and a temperature decrease region β set in accordance with the vehicle speed V, the intake pipe negative pressure Pb, and the outside air temperature Ta.
FIG. 5 is a flowchart showing an operation of a control device for a hybrid vehicle according to a modification of the present embodiment.
[Explanation of symbols]
10 Hybrid vehicle control device
13 Manual transmission (transmission)
47 Control unit (temperature region setting means, operation switching means)
48 Notification device (notification means)
Step S02 Second stop means
Step S05 First stop means
Step S07 Operation switching means
Step S10: Notification operating means, temperature-based notification operating means, rotation speed-based notification operating means

Claims (4)

A motor that is used as a vehicle drive source together with the internal combustion engine, an inverter that supplies electric power to the motor, a cooling circuit that distributes the internal combustion engine and a refrigerant that cools the inverter, and at least the internal combustion engine by operation of a vehicle occupant Or a control device for a hybrid vehicle, comprising: a transmission that connects any one of the motors to drive wheels and transmits a driving force via any of a plurality of shift stages;
A temperature region setting means for setting a temperature increase region and a temperature decrease region according to a temperature state predicted for the inverter according to a vehicle speed and a load state of the internal combustion engine;
Informing means for urging a vehicle occupant to perform a shift operation for switching the transmission to a higher gear side;
A control device for a hybrid vehicle, comprising: a notification actuating unit that activates the notifying unit when the detected value of the speed and the load state belongs to the temperature increase region. The air conditioner condenser provided in the air conditioner is provided at a position facing the radiator provided in the cooling circuit,
A temperature-based notification operating means for operating the notification means when the temperature of the refrigerant is equal to or higher than a predetermined first set temperature;
Operation switching means for reducing the output of the air conditioner when the temperature of the refrigerant is equal to or higher than a predetermined second set temperature higher than the first set temperature;
The hybrid vehicle control device according to claim 1, further comprising: First stop means for stopping the operation of the air conditioner when the temperature of the refrigerant is equal to or higher than a predetermined third set temperature higher than the second set temperature;
Second stop means for stopping the switching operation of the inverter when the temperature of the inverter is equal to or higher than a predetermined fourth set temperature;
The control apparatus of the hybrid vehicle of Claim 2 characterized by the above-mentioned . A control apparatus for a hybrid vehicle, comprising: a motor that serves as a vehicle drive source together with the internal combustion engine; an inverter that supplies electric power to the motor; and a cooling circuit that circulates the internal combustion engine and a refrigerant that cools the inverter;
A temperature region setting means for setting a temperature increase region and a temperature decrease region according to a temperature state predicted for the inverter according to a vehicle speed and a load state of the internal combustion engine;
A control device for a hybrid vehicle, comprising: an operation switching means for reducing an output of an air conditioner when the detected value of the speed and the load state belongs to the temperature increase region .

Images