JP2013001131A - Control device of hybrid vehicle - Google Patents

Abstract

The present invention provides a control device for a hybrid vehicle capable of suppressing a driver from feeling uncomfortable due to a significant driving sound of a blower accompanying an automatic stop of an engine.
The vehicle includes a second motor generator and an internal combustion engine as drive sources, and an electric fan that blows air to the battery to cool the battery that supplies power to the second motor generator. When the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth, the electronic control device sets the fan rotation speed Nfan of the electric fan to be equal to or higher than the predetermined rotation speed Nth. Further, the operation of the internal combustion engine is automatically stopped when a predetermined automatic stop condition is satisfied. However, when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth, automatic stop of the internal combustion engine is prohibited.
[Selection] Figure 3

Description

  The present invention relates to a control apparatus for a hybrid vehicle including a motor driven by power supply from a secondary battery and an internal combustion engine as drive sources.

  A hybrid vehicle including a motor and an internal combustion engine as drive sources is well known (see, for example, Patent Document 1). In such a hybrid vehicle control device, for example, a predetermined automatic stop condition in which the state of charge (SOC) of the secondary battery that supplies power to the motor is greater than or equal to a predetermined value and the vehicle speed is less than or equal to a predetermined speed while the vehicle is running. When is established, the operation of the internal combustion engine is automatically stopped and the vehicle is driven by the motor.

  Further, in such a hybrid vehicle, when the temperature of the secondary battery that supplies power to the motor becomes excessively high, the secondary battery deteriorates. Therefore, the secondary battery is cooled by blowing air from a blower. I try to figure it out.

JP 2006-257913 A

  By the way, in such a hybrid vehicle, when a predetermined automatic stop condition is satisfied and the operation of the internal combustion engine is automatically stopped, the blower may be driven to cool the secondary battery. In this case, the driving sound of the blower may become noticeable due to the absence of the driving sound of the internal combustion engine so far, which may give the driver a feeling of strangeness.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hybrid vehicle capable of suppressing the driver from feeling uncomfortable due to the significant driving noise of the blower accompanying the automatic stop of the engine. It is to provide a control device.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The invention according to claim 1 is a hybrid vehicle including a motor and an internal combustion engine as drive sources, and a blower that blows air to the secondary battery to cool the secondary battery that supplies power to the motor. In a hybrid vehicle control device that is applied and automatically stops the operation of the internal combustion engine when a predetermined automatic stop condition is satisfied, the internal combustion engine is operated when the sound pressure level of the drive sound of the blower in the passenger compartment is equal to or higher than a predetermined level. The gist is to prohibit the automatic stop of the engine.

  According to this configuration, even if a predetermined automatic stop condition is satisfied, the automatic stop of the internal combustion engine is prohibited when the sound pressure level of the drive sound of the blower in the passenger compartment is equal to or higher than the predetermined level. For this reason, the internal combustion engine is not automatically stopped when the driving sound of the blower is loud. Therefore, it is possible to suppress the driver from feeling uncomfortable due to the driving sound of the blower becoming noticeable with the automatic stop of the engine.

  According to a second aspect of the present invention, in the hybrid vehicle control device according to the first aspect, when the rotational speed of the blower is equal to or higher than a predetermined rotational speed, the sound pressure level of the driving sound of the blower in the passenger compartment is the predetermined level. The gist is to prohibit the automatic stop of the internal combustion engine because it is above the level.

  As the rotational speed of the blower increases, the sound pressure level of the drive sound increases. Therefore, according to the said structure, since it can grasp | ascertain based on the rotational speed of an air blower that the sound pressure level of the drive sound of the air blower in a vehicle interior is more than the said predetermined level, invention of Claim 1 is provided. It can be easily realized.

  According to a second aspect of the present invention, the hybrid vehicle control device sets the rotational speed of the blower to be equal to or higher than the predetermined rotational speed when the temperature of the secondary battery becomes equal to or higher than the predetermined temperature. It can be embodied in such a manner. In this case, when the temperature of the secondary battery is equal to or higher than the predetermined temperature, the rotational speed of the blower is set to be equal to or higher than the predetermined rotational speed, and automatic stop of the internal combustion engine is prohibited even if a predetermined automatic stop condition is satisfied.

  According to a fourth aspect of the present invention, in the hybrid vehicle control device according to any one of the first to third aspects, when the predetermined automatic stop condition is satisfied, a vehicle other than the driving sound of the blower is provided. The gist of the invention is to automatically stop the internal combustion engine when the sound pressure level of the noise in the room is equal to or higher than the reference level, regardless of the sound pressure level of the driving sound of the blower in the vehicle interior.

  For example, the higher the sound pressure level of noise such as road noise or driving sound of an air conditioner, the more hidden the driving sound of the blower in the passenger compartment. For this reason, when the sound pressure level of noise other than the driving sound of the blower is sufficiently high in the passenger compartment, the driving sound of the blower does not become noticeable when the engine operation is stopped. Therefore, according to the above configuration, it is possible to reduce fuel consumption through the automatic stop of the internal combustion engine while avoiding that the driving sound of the blower becomes significant.

  According to a fifth aspect of the present invention, there is provided a hybrid vehicle including a motor and an internal combustion engine as drive sources and a blower that blows air to the secondary battery to cool the secondary battery that supplies power to the motor. Applied to a hybrid vehicle control device that automatically stops operation of an internal combustion engine when a predetermined automatic stop condition is satisfied, and prohibits automatic stop of the internal combustion engine when the rotational speed of the blower is equal to or higher than a predetermined rotational speed The gist is to do.

  According to this configuration, even when a predetermined automatic stop condition is satisfied, the automatic stop of the internal combustion engine is prohibited when the rotational speed of the blower is equal to or higher than the predetermined rotational speed. For this reason, the internal combustion engine is not automatically stopped when the rotational speed of the blower is high and the drive sound of the blower is loud. Therefore, it is possible to suppress the driver from feeling uncomfortable due to the driving sound of the blower becoming noticeable with the automatic stop of the engine.

The schematic block diagram which shows schematic structure of the hybrid vehicle in one Embodiment of this invention, and its control apparatus. The graph which shows the relationship between the battery temperature and the fan rotational speed of an electric fan in the embodiment. The flowchart which shows the process sequence of the automatic stop control of the internal combustion engine in the embodiment.

Hereinafter, an embodiment in which a hybrid vehicle control device according to the present invention is embodied will be described in detail with reference to FIGS. 1 to 3.
As shown in FIG. 1, the vehicle 1 includes an internal combustion engine 10 and a motor generator (hereinafter, a second motor generator 12) as a drive source for rotating the drive wheels 5. The power output from the internal combustion engine 10 is transmitted to the drive wheels 5 via the power split mechanism 2, the speed reducer 3, and the axle 4. The power output from the second motor generator 12 is transmitted to the drive wheels 5 via the motor reduction mechanism 6, the speed reducer 3, and the axle 4. In the vehicle 1 of this embodiment, the front wheels are drive wheels 5 and the rear wheels are driven wheels.

  Specifically, the power output from the internal combustion engine 10 is divided by the power split mechanism 2 into power transmitted to the drive wheels 5 and power transmitted to the motor generator (hereinafter referred to as the first motor generator 11). Is done. The first motor generator 11 generates power using the power output from the internal combustion engine 10, and the generated power is supplied to the battery 8 via the power converter 7 and charged. When the internal combustion engine 10 is started, cranking is performed by driving the first motor generator 11 with electric power supplied from the battery 8. That is, the first motor generator 11 functions as a starting device for the internal combustion engine 10.

  The second motor generator 12 outputs power by being driven by electric power supplied from the battery 8. The second motor generator 12 generates power by the rotational force of the drive wheels 5 when the vehicle 1 is decelerated or braked, and the generated power is supplied to the battery 8 via the power converter 7. Charged.

  Here, the power conversion unit 7 includes an inverter, a converter, and the like, and converts AC power supplied from the motor generators 11 and 12 into DC power and converts the voltage into the voltage level of the battery 8. Supplied to the battery 8. The power conversion unit 7 converts the DC power supplied from the battery 8 into AC power, boosts it, and supplies it to the motor generators 11 and 12.

Further, the vehicle 1 is provided with an electric fan 30 for blowing air to the battery 8 in order to cool the battery 8.
Various controls of the vehicle including various controls of the internal combustion engine 10 and motor generators 11 and 12 are performed by the electronic control unit 20.

  The internal combustion engine 10 is provided with various sensors for detecting engine operating conditions such as the engine speed, intake air amount, throttle opening, and coolant temperature. These various sensors are electrically connected to the electronic control unit 20.

Further, the electronic control device 20 is electrically connected to various sensors for detecting a vehicle running state such as an accelerator operation amount ACCP, a brake depression amount B, and a vehicle speed V.
In addition, a sensor for detecting the state of charge SOC of the battery 8 and a sensor for detecting the temperature of the battery 8 (hereinafter, battery temperature Tbatt) are electrically connected to the electronic control unit 20. .

  The electronic control unit 20 temporarily stores a central processing unit (CPU) that performs arithmetic processing related to various controls, a read-only memory (ROM) that stores various control programs and data, and results of arithmetic processing. It comprises a random access memory (RAM) for storing. The electronic control unit 20 reads the detection signals of the various sensors, executes various arithmetic processes, and comprehensively controls the vehicle 1 (the internal combustion engine 10 and the motor generators 11 and 12) based on the results.

  In addition, the electronic control unit 20 calculates a required driving force of the vehicle 1 based on the accelerator operation amount ACCP and the like, and performs vehicle traveling control based on the required driving force and the vehicle speed V. That is, when the vehicle 1 starts or runs at a low speed, the internal combustion engine 10 is stopped, and the vehicle travels only by the power output from the second motor generator 12, so-called EV travel. Further, when the vehicle is accelerating or traveling at high speed, the internal combustion engine 10 is operated, and in addition to or instead of the power output from the second motor generator 12, the power output from the internal combustion engine 10 is used. Car travels.

  That is, during operation of the internal combustion engine 10, the operation of the internal combustion engine 10 is performed when a predetermined automatic stop condition is satisfied, for example, the state of charge SOC of the battery 8 is equal to or higher than a predetermined value and the vehicle speed V is equal to or lower than the predetermined speed. Stop automatically. The predetermined value and the predetermined speed are set in advance through experiments and simulations.

  Moreover, since the deterioration of the battery 8 will progress if the battery temperature Tbatt of the battery 8 becomes excessively high, the electronic control unit 20 performs drive control of the electric fan 30 described below in order to cool the battery 8. Do.

  As shown in FIG. 2, in the drive control of the electric fan 30, the fan rotational speed Nfan of the electric fan 30 is set to “0” because it is not necessary to cool the battery 8 when the battery temperature Tbatt is lower than the start temperature Tstrt. To do. That is, the electric fan 30 is stopped.

  On the other hand, when the battery temperature Tbatt is equal to or higher than the start temperature Tstrt, the fan rotation speed Nfan of the electric fan 30 is set to be larger as the battery temperature Tbatt becomes higher. When the battery temperature Tbatt is equal to or higher than the reference temperature T1, the fan rotation speed Nfan is maintained at the maximum value Nmax.

  By the way, in such a vehicle 1, as described above, when the predetermined automatic stop condition is satisfied and the operation of the internal combustion engine 10 is automatically stopped, the electric fan 30 is driven to cool the battery 8. May have been. Here, as the fan rotation speed Nfan of the electric fan 30 increases, the sound pressure level of the driving sound of the electric fan 30 in the passenger compartment increases. For this reason, when the internal combustion engine 10 is automatically stopped when the sound pressure level of the driving sound of the electric fan 30 is high, the driving sound of the electric fan 30 becomes significant due to the absence of the operating sound of the internal combustion engine 10 until then, There is a risk of discomfort to the driver.

  Therefore, in the present embodiment, when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth, the above-described inconvenience is suppressed by prohibiting the automatic stop of the internal combustion engine 10.

  Next, the automatic stop control of the internal combustion engine 10 in the present embodiment will be described with reference to FIG. Note that the series of processes shown in FIG. 3 is repeatedly executed at predetermined intervals during the operation of the internal combustion engine 10 through the electronic control unit 20.

  As shown in FIG. 3, in this series of processing, first, in step S1, it is determined whether or not an automatic stop condition is satisfied. Here, when the state of charge SOC of the battery 8 is smaller than a predetermined value, or when the vehicle speed V is larger than the predetermined speed, it is assumed that the automatic stop condition is not satisfied (step S1: “NO”). Is temporarily terminated.

  On the other hand, when the state of charge SOC of the battery 8 is greater than or equal to a predetermined value and the vehicle speed V is less than or equal to the predetermined speed, it is assumed that the automatic stop condition is satisfied (step S1: “YES”). Then, it is determined whether or not the battery temperature Tbatt is lower than the predetermined temperature Tth. Here, the predetermined temperature Tth is higher than the start temperature Tstrt and lower than the reference temperature T1, and when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth, the fan rotational speed Nfan of the electric fan 30 is equal to or higher than the predetermined rotational speed Nth. (See FIG. 2).

  If the battery temperature Tbatt is lower than the predetermined temperature Tth in step S2, that is, if the fan rotational speed Nfan of the electric fan 30 is lower than the predetermined rotational speed Nth (step S2: “YES”), the electric fan in the vehicle interior Assuming that the sound pressure level of the driving sound 30 does not exceed a predetermined level, the internal combustion engine 10 is automatically stopped. Then, this series of processes is temporarily terminated. Here, a predetermined level indicating a noise level which is a problem for the driver in the passenger compartment is set through experiments, simulations, and the like.

  On the other hand, when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth in step S2, that is, when the fan rotational speed Nfan of the electric fan 30 is equal to or higher than the predetermined rotational speed Nth (step S2: “NO”), Assuming that the sound pressure level of the driving sound of the fan 30 exceeds a predetermined level, the automatic stop of the internal combustion engine 10 is prohibited. Then, this series of processes is temporarily terminated.

Next, the operation of this embodiment will be described.
Even when a predetermined automatic stop condition is satisfied, the electronic control unit 20 determines that the fan rotation speed Nfan of the electric fan 30 is equal to or higher than the predetermined rotation speed Nth when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth. Assuming that the sound pressure level of the driving sound 30 is equal to or higher than a predetermined level, automatic stop of the internal combustion engine 10 is prohibited. For this reason, the internal combustion engine 10 is not automatically stopped when the driving sound of the electric fan 30 is loud. Therefore, the driving sound of the electric fan 30 is suppressed from becoming noticeable in the vehicle interior by automatically stopping the internal combustion engine 10.

  The second motor generator 12 corresponds to the motor according to the present invention. The battery 8 corresponds to the secondary battery according to the present invention. The electric fan 30 corresponds to the blower according to the present invention.

According to the hybrid vehicle control apparatus according to the present embodiment described above, the following effects can be obtained.
(1) The vehicle 1 includes the second motor generator 12 and the internal combustion engine 10 as drive sources, and blows air to the battery 8 to cool the battery 8 that supplies power to the second motor generator 12. The electric fan 30 is provided. When the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth, the electronic control unit 20 sets the fan rotation speed Nfan of the electric fan 30 to be equal to or higher than the predetermined rotation speed Nth. Further, the operation of the internal combustion engine 10 is automatically stopped when a predetermined automatic stop condition is satisfied. However, the automatic stop of the internal combustion engine 10 is prohibited when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth.

According to such a configuration, it is possible to suppress the driver from feeling uncomfortable due to the driving sound of the electric fan 30 becoming conspicuous with the automatic stop of the engine.
In addition, the control apparatus of the hybrid vehicle which concerns on this invention is not limited to the structure illustrated in the said embodiment, For example, it can also implement as the following forms which changed this suitably.

  In the above-described embodiment, a so-called split type (power split type) hybrid vehicle is illustrated, but the hybrid vehicle according to the present invention is not limited to this, and other types of hybrid vehicles, for example, parallel type hybrid vehicles, are not limited thereto. The present invention can also be applied to a vehicle.

  In the above embodiment, as illustrated in FIG. 2, the fan rotation speed Nfan is continuously increased as the battery temperature Tbatt increases. However, the drive control mode of the electric fan 30 is not limited thereto. Alternatively, for example, the fan rotation speed Nfan may be increased stepwise as the battery temperature Tbatt increases.

  In the above embodiment, the automatic stop of the internal combustion engine 10 is always prohibited when the battery temperature Tbatt is equal to or higher than the predetermined temperature Tth. However, the present invention is not limited to this. For example, as the sound pressure level of noise such as road noise or driving sound of an air conditioner increases, the driving sound of the electric fan 30 is hidden in the passenger compartment. For this reason, when the sound pressure level of noise other than the driving sound of the electric fan 30 is sufficiently high in the vehicle interior, the driving sound of the electric fan 30 does not become noticeable when the engine operation is stopped. Therefore, when the predetermined automatic stop condition is satisfied, and the sound pressure level of the noise in the vehicle interior other than the drive sound of the electric fan 30 is equal to or higher than the reference level, the sound pressure level of the drive sound of the electric fan 30 in the vehicle interior is The internal combustion engine 10 may be automatically stopped regardless of the size. In this case, fuel consumption can be reduced through the automatic stop of the internal combustion engine 10 while avoiding the driving sound of the electric fan 30 becoming noticeable. In addition, as noise in the vehicle interior other than the driving sound of the electric fan 30, in addition to the road noise and the driving sound of the air conditioner described above, a sound from an acoustic device may be taken into account.

  In the above embodiment, the fan rotation speed Nfan of the electric fan 30, that is, the sound pressure level of the driving sound of the electric fan 30 is grasped based on the battery temperature Tbatt. However, the present invention is not limited to this, and the fan rotational speed Nfan of the electric fan 30 is directly detected, and the sound pressure level of the driving sound of the electric fan 30 is grasped based on the fan rotational speed Nfan. May be. Further, the sound pressure level of the driving sound of the electric fan 30 in the passenger compartment may be directly detected.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Power split mechanism, 3 ... Reduction gear, 4 ... Axle, 5 ... Drive wheel, 6 ... Motor reduction mechanism, 7 ... Electric power conversion part, 8 ... Battery, 10 ... Internal combustion engine, 11 ... 1st Motor generator, 12 ... second motor generator, 20 ... electronic control device, 30 ... electric fan (blower).

Claims (5)

The present invention is applied to a hybrid vehicle including a motor and an internal combustion engine as a drive source, and a blower that blows air to the secondary battery to cool the secondary battery that supplies power to the motor. In the hybrid vehicle control device that automatically stops the operation of the internal combustion engine when established,
A control apparatus for a hybrid vehicle, wherein an automatic stop of an internal combustion engine is prohibited when a sound pressure level of a driving sound of the blower in a passenger compartment is equal to or higher than a predetermined level. In the hybrid vehicle control device according to claim 1,
Controlling a hybrid vehicle characterized in that when the rotational speed of the blower is equal to or higher than a predetermined rotational speed, an automatic stop of the internal combustion engine is prohibited because the sound pressure level of the drive sound of the blower in the passenger compartment is equal to or higher than the predetermined level. apparatus. In the hybrid vehicle control device according to claim 2,
When the temperature of the secondary battery becomes equal to or higher than a predetermined temperature, the rotational speed of the blower is set to be equal to or higher than the predetermined rotational speed. In the control apparatus of the hybrid vehicle as described in any one of Claims 1-3,
When the predetermined automatic stop condition is satisfied, when the sound pressure level of noise in the vehicle interior other than the drive sound of the blower is equal to or higher than a reference level, the sound pressure level of the drive sound of the blower in the vehicle interior is increased. A control apparatus for a hybrid vehicle, characterized in that the internal combustion engine is automatically stopped regardless. The present invention is applied to a hybrid vehicle including a motor and an internal combustion engine as a drive source, and a blower that blows air to the secondary battery to cool the secondary battery that supplies power to the motor. In the hybrid vehicle control device that automatically stops the operation of the internal combustion engine when established,
The hybrid vehicle control device, wherein an automatic stop of the internal combustion engine is prohibited when the rotational speed of the blower is equal to or higher than a predetermined rotational speed.

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