JP2012030667A - Control device of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a hybrid vehicle that can suppress deterioration of gas mileage, while being able to suppress the occurrence of poor start of an engine resulting from fuel deterioration.SOLUTION: The control device includes: a vehicle driving motor which gives driving force to the vehicle; an engine which operates with the fuel supplied from a fuel tank; a charging state detector which detects a charging value of a battery; a fuel deterioration determiner 37 to determine deterioration of the fuel; a selector 36 which selects when the charging value detected by the charging state detector is below a predetermined charging threshold, a second travel mode among a first travel mode in which the vehicle is traveled with driving force of the motor and the second travel mode in which the vehicle is traveled by driving the engine; and a changer 38 which changes predetermined charging threshold to make it high, when the fuel is determined to be deteriorated by the fuel deterioration determiner.

Description

  The present invention relates to a control device for a hybrid vehicle including an engine (internal combustion engine) and a motor (electric motor) as drive sources, and more particularly to control of a plug-in hybrid vehicle that can charge a battery that supplies power to the motor with an external commercial power source. It is suitably used as a device.

  Conventionally, a hybrid vehicle in which a driving force of a vehicle is obtained by combining an engine and a motor has been developed and put into practical use. In recent years, a plug-in hybrid vehicle in which a battery for supplying power to a motor can be charged by an external commercial power source has been developed and put into practical use.

  The plug-in hybrid vehicle includes an EV mode in which driving wheels are driven using only a motor as a power source, a series mode in which the motor is used as a power source and the engine is used as a power supply source (generator) of the motor, or the engine and the motor. The parallel mode using both of them as the power source may be switched according to the driving situation. Thereby, fuel consumption can be remarkably suppressed.

  By the way, the fuel used for the engine gradually deteriorates if it is retained in the fuel tank or the piping for a long time. For example, the volatile component of the fuel may evaporate, and the ratio of the fuel component may become inappropriate, and there is a risk that a malfunction may occur when starting the engine due to such fuel deterioration.

  In other words, the hybrid vehicle has an advantage that the fuel consumption can be reduced as compared with the gasoline vehicle, but the problem that the above-described problem is likely to occur due to the fuel staying in the tank for a long period of time. There is. In particular, in the plug-in hybrid vehicle in which the EV mode and the series mode or the parallel mode are switched depending on the driving situation as described above, the fuel consumption in the engine can be remarkably suppressed, but there is also a problem caused by the fuel deterioration correspondingly. It tends to occur.

  In order to solve such a problem, there is one in which when the fuel is deteriorated, the frequency of use of the fuel is increased to promote consumption of the deteriorated fuel. Specifically, when vehicle travel is being executed using only a motor (electric motor) as a drive source (EV mode), if it is detected that fuel has deteriorated, the engine (internal combustion engine) is operated. There is one in which the vehicle is driven using the driving force (switching to the parallel mode) (see, for example, Patent Document 1).

JP 2009-255680 A

  By adopting such a technique, it is possible to promote deteriorated fuel consumption. However, the advantage of the hybrid vehicle that the fuel consumption is extremely small cannot be utilized. For example, when the fuel remains up to the vicinity of the upper limit of the tank capacity, the travel distance until the fuel is consumed becomes a considerable distance. In the meantime, traveling using the engine as a power source is forced. In other words, during this period, the fuel efficiency is significantly reduced as compared with the normal running in which the fuel is not deteriorated.

  In order to promote fuel consumption, it is preferable to grasp the deterioration state of the fuel as accurately as possible. This is because if the deterioration state of the fuel cannot be accurately grasped, the fuel consumption is reduced more than necessary, and the advantages of the hybrid vehicle cannot be fully utilized.

  The present invention has been made in view of such circumstances, and provides a control device for a hybrid vehicle that can suppress the occurrence of engine start failure due to fuel deterioration and also suppress the decrease in fuel consumption. The purpose is to do.

  According to a first aspect of the present invention for solving the above-described problem, a vehicle driving motor that operates with electric power supplied from a battery and applies driving force to the vehicle, and a fuel supplied from a fuel tank, the vehicle or A vehicle driving or generator driving engine for applying a driving force to the generator, a charging state detecting means for detecting a charge value of the battery, a fuel deterioration determining means for determining the deterioration of the fuel, and stopping the engine to The charge value detected by the charge state detection means is a predetermined charge in a first traveling mode in which the vehicle is driven by a driving force of a motor and a second traveling mode in which the vehicle is driven while driving the engine. When the value is equal to or lower than the threshold value, the fuel is determined to be deteriorated by the selecting means for selecting the second traveling mode and the fuel deterioration determining means. When, the control apparatus for a hybrid vehicle characterized in that it comprises a changing means for changing to be higher the predetermined charge threshold value.

  In the present invention, when the fuel deterioration is detected, the changing means changes the predetermined charging threshold to be higher based on the state of charge (SOC value) of the battery. The second traveling mode is selected, and fuel consumption is more reliably promoted. Thereby, consumption of the deteriorated fuel can be promoted while suppressing a significant decrease in fuel consumption.

  The second aspect of the present invention further includes request output detection means for detecting the request output of the vehicle, wherein the selection means is configured such that the charge value is larger than the predetermined charge threshold and the request output detection means When the detected required output is less than or equal to a predetermined required output threshold, the first driving mode is selected, the charged value is greater than the predetermined charging threshold, and the required output detected by the required output detecting means The second travel mode is selected when is greater than the predetermined required output threshold value, and the changing means sets the predetermined required output threshold value when the fuel deterioration determining means determines that the fuel is deteriorated. The hybrid vehicle control device according to the first aspect is characterized by being changed to be lower.

  In the second aspect, when the fuel deterioration is detected, the second driving mode is further selected so that the predetermined charging threshold is increased and the predetermined required output threshold is decreased. The fuel consumption is more surely promoted.

  According to a third aspect of the present invention, in the hybrid vehicle control device according to the first or second aspect, the fuel deterioration determining means determines whether or not the fuel has deteriorated when the engine is cold. .

  In the third aspect, by performing the determination when the engine is cold, the presence or absence of fuel deterioration can be more reliably determined.

  According to a fourth aspect of the present invention, the fuel deterioration determining means determines the degree of fuel deterioration based on the state of the fuel when the engine is cold and the state of the fuel when the engine is temperate. The hybrid vehicle control device according to the first to third aspects is characterized.

  In the fourth aspect, it is possible to more reliably determine the presence or absence of deterioration by reliably determining the degree of fuel deterioration.

  According to the hybrid vehicle control device of the present invention, when it is determined that the fuel has deteriorated, the amount of use of the fuel is promoted. Etc. can be suppressed. In addition, although fuel consumption is promoted, a significant reduction in fuel consumption can be suppressed.

1 is a schematic diagram of a hybrid vehicle according to an embodiment of the present invention. It is a figure which shows an example of the map which shows the relationship between SOC, request | requirement output, and a driving | running state. 1 is a block diagram showing a schematic configuration of a vehicle control device according to an embodiment of the present invention. It is a graph which shows the relationship between the drive time of an engine, and the corrected amount of fuel injection amount. It is a flowchart which shows an example of the selection control which concerns on one Embodiment of this invention. It is a figure which shows the relationship between a fuel remaining amount, and the 1st and 2nd threshold value.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a hybrid vehicle (hereinafter also simply referred to as “vehicle”) 10 according to the present embodiment is a so-called plug-in hybrid vehicle, and uses a front motor 11 and a rear motor 12 and an engine 13 for traveling. As a drive source. The driving force of the front motor 11 is transmitted to the front wheels 15 via the front drive transmission mechanism 14. The driving force of the rear motor 12 is transmitted to the rear wheel 17 via the rear drive transmission mechanism 16. A battery 19 is connected to the front motor 11 via a front (Fr) motor inverter 18, and a battery 19 is connected to the rear motor 12 via a rear (Re) motor inverter 20. Electric power corresponding to the passenger's pedal operation is supplied from the battery 19 to the motors 11 and 12 via the inverters 18 and 20. Further, a sub-battery (12V battery) 22 for driving auxiliary machinery is connected to the battery 19 via a DC / DC converter 21. When the charge amount of the sub-battery 22 decreases, the battery 19 is charged. Moreover, the vehicle-mounted charger 23 is connected to the battery 19, and the battery 19 can be charged also by an external commercial power source.

  The engine 13 is driven by burning the fuel supplied from the fuel tank 24. A generator (generator) 26 is connected to the engine 13 via an output system 25. The generator 26 is connected to the battery 19 (and the front motor 11) via a generator inverter 27. The output system 25 is connected to the generator 26, and is also connected to the front drive transmission mechanism 14 via the clutch 28.

  When the engine 13 is driven according to the driving state of the vehicle 10, the driving force of the engine 13 is first transmitted to the generator 26 via the output system 25. The generator 26 is operated by the driving force of the engine 13, and the electric power generated by the generator 26 is appropriately supplied to the front motor 11 and the battery 19. When the clutch 28 is connected in accordance with the driving state of the vehicle 10, the driving force of the engine 13 is transmitted to the front wheels 15 via the front drive transmission mechanism 14.

  As described above, the vehicle 10 according to the present embodiment includes the EV travel mode, which is the first travel mode using the motors 11 and 12 as drive sources, the motors 11 and 12, the engine 13, according to the driving state of the vehicle 10. Any one of the second travel modes using both of them as drive sources is selected as appropriate. Further, as the second traveling mode, specifically, a series traveling mode in which the engine 13 is used as a power supply source of the motors 11 and 12 and each wheel of the vehicle by the driving force of both the motors 11 and 12 and the engine 13 are used. And a parallel running mode in which the motors 15 and 17 are driven.

  More specifically, in the EV travel mode that is the first travel mode, the fuel supply to the engine 13 is stopped, the engine 13 is not driven, and the driving force of only the front motor 11 and the rear motor 12 is used. The vehicle 10 is caused to travel.

  In the series travel mode, which is one of the second travel modes, the vehicle 10 travels by the driving force of the front motor 11 and the rear motor 12 as in the EV travel mode, but the engine 13 is driven to drive the battery 19 (and the front 19). The engine 13 is used as a power supply source (generator) for supplying power to the motor 11). That is, in the series travel mode, the engine 13 is driven but the clutch 28 is disengaged so that no power is transmitted between the output system 25 and the front drive transmission mechanism 14, and the driving force of the engine 13 is It is transmitted only to the generator 26 via the output system 25.

  In the parallel travel mode, which is one of the second travel modes, the vehicle 10 travels using both the motors 11 and 12 and the engine 13 as drive sources. For example, when the efficiency of traveling by the engine is higher than traveling by the motor, the clutch 28 is connected to transmit the driving force of the engine 13 to the front drive transmission mechanism 14. That is, in the parallel traveling mode, the driving force of the motors 11 and 12 is added to the engine 13 (or with the driving force of the engine 13 alone), and the vehicle 10 is caused to travel.

  Here, the driving state of the vehicle 10 serving as a reference for selecting these driving modes is specified by the relationship between the state of charge of the battery 19 (hereinafter also referred to as “SOC (State of Charge)”) and the driver's requested output. Has been. And the relationship between the driving | running state of the vehicle 10 and driving modes is preset as a map as shown in FIG. 2, for example. In the example shown in FIG. 2, in the driving state A in which the SOC is X (%) or more and the required output is Y (kW) or less, the EV driving mode that is the first driving mode is set, and the SOC is X (% ) Or the required output is larger than Y (kW), the driving state B is set to the second traveling mode, either the series traveling mode or the parallel traveling mode. In practice, the driving state in which the series driving mode is set and the driving state in which the parallel driving mode is set are further divided within the range of the driving state B. What kind of classification should be determined may be set as appropriate in consideration of the characteristics of the vehicle 10 and the like.

  Further, the vehicle 10 is provided with a control device 30 that comprehensively controls various devices mounted on the vehicle 10. The control device 30 grasps the driving state of the vehicle 10 based on signals from various sensors provided in the vehicle 10, and comprehensively controls various devices based on the grasped state. For example, the control device 30 also selects the travel mode according to the driving state of the vehicle 10 described above.

Hereinafter, the traveling mode selection control by the control device 30 according to the present invention will be described.
As shown in FIG. 3, the control device 30 includes a motor control unit 31 that controls the driving of the front motor 11 and the rear motor 12, and an engine control unit 32 that controls the driving of the engine 13. Accordingly, a selection control unit 33 that appropriately selects a travel mode is provided.

  The selection control unit 33 includes an SOC detection means (charge state detection means) 34, a required output calculation means (request output detection means) 35, and a selection means 36, a fuel deterioration determination means 37, and a change means 38. And comprising.

  The SOC detection means 34 detects the SOC of the battery 19. The battery 19 is provided with a battery sensor 39 such as a voltage sensor or a current sensor. The SOC detection means 34 detects (calculates) the SOC of the battery 19 based on the information from the battery sensor 39.

  Based on the detection result of the accelerator position sensor 40, the request output calculation means 35 calculates an output (request output) requested by the driver by calculation, and detects the request output value.

  The selection unit 36 specifies the driving state of the vehicle 10 from the detection result of the SOC detection unit 34 and the calculation result of the request output calculation unit 35, and selects a driving mode according to the driving state. As described above, in the present embodiment, the driving state of the vehicle 10 is specified by the relationship between the SOC of the battery 19 and the driver's requested output, and the relationship between the driving state of the vehicle 10 and each travel mode is shown in FIG. 2 is stored in the storage unit 41 as a map as shown in FIG. The selection unit 36 selects a travel mode according to the driving state of the vehicle 10 with reference to the map stored in the storage unit 41 from the detection result of the SOC detection unit 34 and the calculation result of the request output calculation unit 35. To do. For example, in the case of the map shown in FIG. 2, if the SOC is equal to or greater than X (%) and the required output is equal to or less than Y (kW), the selection unit 36 selects the EV travel mode that is the first travel mode, and the SOC Is lower than X (%) or the required output is larger than Y (kW), the second traveling mode, which is the series traveling mode or the parallel traveling mode, is appropriately selected.

  The fuel deterioration determining means 37 determines whether or not the fuel remaining in the fuel tank 24 has deteriorated at a predetermined timing. Specifically, the fuel deterioration determination unit 37 determines “deterioration” when the deterioration degree of the fuel remaining in the fuel tank 24 is higher than a predetermined degree, and “no deterioration” when the deterioration degree is less than the predetermined degree. Is determined. For example, the fuel deterioration determination means 37 determines whether or not the fuel has deteriorated based on the fuel correction learning value when the engine 13 is cold and the fuel correction learning value when the engine 13 is cold. judge.

  Here, when the engine 13 is feedback-controlled, for example, as shown in FIG. 4, the fuel injection amount is appropriately corrected so as to become a predetermined air-fuel ratio. When the fuel in the fuel tank 24 is deteriorated and the low-temperature volatile component is evaporated, the correction amount of the fuel injection amount increases more than usual. The correction amount in the cold fuel correction learning region in FIG. 4 is an example in the case where there is no fuel deterioration, and the dotted line is an example in the case where there is fuel deterioration.

  As can be seen from the example of FIG. 4, the increase in the correction amount of the fuel injection amount due to the deterioration of the fuel is particularly noticeable when the engine 13 is cold. Therefore, in the present embodiment, the fuel deterioration determination means 37 obtains the degree of fuel deterioration based on the correction amount of the fuel injection amount when the engine 13 is cold, and determines whether or not the fuel has deteriorated based on the degree of deterioration. Judgment.

  First, a cold fuel correction learning value is calculated immediately after the engine 13 is started and when the engine 13 is cold. An average value of the correction amounts from immediately after the engine 13 is started until the engine 13 reaches a predetermined temperature, for example, about 60 ° C. (cold fuel correction learning region) is calculated as a cold fuel correction learned value. Further, after the completion of warming up of the engine 13, an average value of correction amounts until the engine 13 reaches a predetermined temperature, for example, about 80 ° C. (normal fuel correction learning region) is calculated as a normal fuel correction learning value. Based on the cold fuel correction learning value and the normal fuel correction learning value, a fuel deterioration learning value (%) as a fuel deterioration degree is calculated based on the following equation (1).

  Then, the fuel deterioration determination means 37 determines the presence or absence of fuel deterioration based on the fuel deterioration learning value. That is, the fuel deterioration determination means 37 determines that there is fuel deterioration when the fuel deterioration learning value is greater than or equal to a predetermined value, that is, when the cold fuel correction learning value is greater than the normal fuel correction learning value by a predetermined value or more. To do. For example, in this embodiment, the fuel deterioration determination unit 37 determines that there is fuel deterioration when the fuel deterioration learning value is 1.10 [%] or more.

  When the fuel deterioration learning value calculated by the fuel deterioration determination unit 37 is greater than or equal to a predetermined value, that is, when it is determined that there is fuel deterioration, the changing unit 38 sets the first travel mode by the selection unit 36. The threshold value between the selected driving state and the driving state in which the second driving mode is selected is changed so that the range of the driving state in which the second driving mode is selected is expanded. In the present embodiment, the changing unit 38 includes a predetermined charging threshold (SOC value X) and a predetermined required output threshold (required output), which are normal thresholds of the operating state A and the operating state B in the map shown in FIG. Is changed to a predetermined charging threshold (SOC value X1) after the change and a predetermined required output threshold (requested value Y1) after the change so that the range of the operating state B is expanded.

  In this embodiment, for example, the change means 38 detects that the fuel remaining amount is equal to or more than a first threshold (for example, a value at which the fueling warning lamp is lit) by the fuel level sensor 42 provided in the fuel tank 24. The above-described threshold value change is performed only when it is performed.

  The control device 30 according to the present invention further includes a refueling reservation determination unit 43 that constitutes the selection control unit 33. When it is determined by the fuel deterioration determination unit 37 that the fuel has deteriorated, the refueling reservation determination unit 43 determines whether or not there is a scheduled refueling within a predetermined period thereafter. For example, in this embodiment, the refueling reservation determination unit 43 determines whether or not there is a schedule for refueling depending on whether or not the driver has operated the refueling reservation switch 44. Of course, this determination method is not particularly limited.

  When the fuel level sensor 42 detects that the remaining fuel amount is equal to or less than the second threshold value that is larger than the first threshold value, the changing unit 38 determines whether or not the above-described operation is performed according to the determination result of the refueling reservation determination unit 43. The charge threshold value and the required output threshold value are changed. That is, when the remaining amount of fuel is in a range greater than the first threshold value and less than or equal to the second threshold value, the changing unit 38 determines that the charging threshold value and Change the required output threshold.

  As described above, when the threshold value is changed by the changing unit 38, the selection unit 36 described above selects a traveling mode according to the driving state of the vehicle 10 based on the changed threshold value. When the travel mode is selected by the selection means 36, the motor control unit 31 and the engine control unit 32 drive the motors 11, 12 and the engine 13 based on the output sharing calculated according to the selected travel mode. To control.

  According to such a control apparatus 30 for a hybrid vehicle, when the fuel is not consumed for a long period of time and the fuel is deteriorated, consumption of the deteriorated fuel can be promoted while suppressing a significant decrease in fuel consumption.

  Next, an example of the travel mode selection control by the control device 30 will be described with reference to the flowchart of FIG.

  When the engine 13 is started at a predetermined timing such as when the vehicle 10 is traveling, the fuel deterioration determination means 37 determines whether or not the fuel in the fuel tank 24 has deteriorated by the method described above in step S1. Here, if it is determined that there is “deterioration” by the fuel deterioration determination means 37 (step S1: Yes), whether or not the remaining amount of fuel is greater than or equal to the first threshold value from the detection result of the fuel level sensor 42 in step S2. Determine whether or not. If the remaining fuel amount is equal to or greater than the first threshold value (step S2: Yes), the second fuel amount in the fuel tank 24 is greater than the first threshold value based on the detection result of the fuel level sensor 42. It is determined whether or not the threshold value is greater than or equal to (step S3).

  The first threshold value and the second threshold value may be set to any value. For example, in the present embodiment, as shown in FIG. The fuel remaining amount of about 10% is set as the first threshold value, and the fuel remaining amount of about 40% is set as the second threshold value.

  Here, when the fuel remaining amount is equal to or greater than the second threshold (step S3: Yes), the changing unit 38 changes the threshold described above and shifts to the fuel consumption promotion mode (step S4). In this fuel consumption promotion mode, the motor control unit 31 and the engine control unit 32 control the motors 11 and 12 and the engine 13 with reference to the map changed by the changing unit 38. Thereby, the period which drives the engine 13 becomes long and consumption of the deteriorated fuel is promoted. When the remaining amount of fuel is equal to or greater than the second threshold, that is, when a relatively large amount of deteriorated fuel remains, it is preferable to quickly consume the deteriorated fuel.

  In addition, when shifting to fuel consumption promotion mode by step S4, it is preferable to notify that to a driver | operator. The notification method is not particularly limited. For example, a comment such as “the fuel has deteriorated and the mode is shifted to the fuel consumption promotion mode” may be displayed to the driver.

  If it is determined in step S1 that the fuel deterioration determining means 37 determines that “no fuel deterioration” (step S1: No), it is not necessary to promote fuel consumption. Transition to is prohibited. That is, the threshold value is not changed by the changing means 38, and the motors 11, 12 and the engine 13 are controlled by a normal map.

  Further, when the remaining fuel amount is smaller than the first threshold value (for example, the value at which the fueling warning lamp is lit) in step S2 (step S2: No), the process proceeds to step S5, and the transition to the fuel consumption promotion mode is made. It is prohibited and the threshold value is not changed by the changing means 38. Obviously, if the remaining amount of fuel is less than the first threshold, refueling will be implemented soon. If refueling is performed, new fuel more than the remaining amount of fuel is supplied into the fuel tank 24. Thereby, the deterioration state of the fuel in the fuel tank 24 is greatly improved. Therefore, when the fuel remaining amount is smaller than the first threshold value, the threshold value is not changed by the changing unit 38. As a result, a reduction in fuel consumption more than necessary is suppressed.

  When the remaining fuel amount is smaller than the second threshold value in step S3, that is, when the remaining fuel amount is equal to or larger than the first threshold value and smaller than the second threshold value (step S3: No). Then, the process proceeds to step S6, where the refueling reservation determination unit 43 determines whether or not refueling is scheduled to be performed within a predetermined period. In the present embodiment, the refueling reservation determination unit 43 determines whether or not there is a schedule for refueling depending on whether or not the refueling reservation switch (SW) 44 has been operated. That is, when there is an operation of the refueling reservation switch 44, it is determined that “there is a plan to carry out refueling”.

  If the refueling reservation switch 44 is not operated by the driver and the refueling reservation determining unit 43 determines that “no refueling is scheduled” (step S6: No), the changing unit 38 changes the threshold value as described above. To shift to the fuel consumption promotion mode (step S4).

  If it is determined in step S6 that the refueling reservation determination unit 43 determines that “refueling is scheduled to be performed” (step S6: Yes), the process proceeds to step S5, and the shift to the fuel consumption promotion mode is prohibited and the changing unit 38. The threshold value is not changed by. When the remaining amount of fuel is less than the second threshold, if fueling is performed, the degree of deterioration of the fuel in the fuel tank 24 is sufficiently improved by the fuel newly supplied by fueling. Therefore, when the remaining amount of fuel is less than the second threshold value and the driver is scheduled to perform fueling, the threshold value is not changed by the changing means 38.

  In step S6, when determining whether or not refueling is scheduled, it is preferable to notify the driver of refueling (operation of the refueling reservation switch 44). The notification method is not particularly limited. For example, a comment such as “Fuel has deteriorated. Do you want to refuel during the current driving?” Is displayed to the driver. Thus, if the driver performs refueling, the deterioration state of the fuel can be improved without promoting fuel consumption.

  As described above, according to the control device 30 of the present invention, fuel consumption is promoted when the fuel in the fuel tank 24 is not consumed over a long period of time and the fuel deteriorates. Thereby, the timing of refueling is advanced, and the deterioration state of the fuel can be improved. In addition, when the fuel is deteriorated, the fuel consumption is promoted by changing the threshold value between the first traveling mode and the second traveling mode as needed instead of merely consuming the fuel. . Therefore, a rapid decrease in fuel consumption can be suppressed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment. The present invention can be modified as appropriate without departing from the scope of the invention.

  For example, in the above-described embodiment, in step S6, whether or not the refueling is scheduled to be performed is determined based on whether or not the driver has operated the refueling reservation switch. It is not limited to this. For example, when the vehicle includes a navigation system, it may be determined whether or not refueling is scheduled to be performed in conjunction with the navigation system. Specifically, the relationship between the remaining travelable distance D1 calculated by the refueling schedule determination unit based on the remaining fuel amount and the distance D2 to the destination set in advance in the navigation system satisfies D1 <D2. If it is, it may be determined that refueling is scheduled to be performed.

  For example, in the above-described embodiment, the presence or absence of fuel deterioration is determined from the cold fuel correction learned value and the normal fuel correction learned value. However, the method for determining fuel deterioration is not particularly limited. . Further, when determining the deterioration of the fuel without being based on the cold fuel correction learning value, the timing for determining the deterioration does not have to be when the engine 13 is started.

  In the above-described embodiment, the hybrid vehicle that can select one of the EV travel mode, the series travel mode, and the parallel travel mode according to the driving state has been described as an example. However, the hybrid vehicle is limited to this. Is not to be done. For example, the hybrid vehicle may be capable of selecting one of the EV traveling mode or the series traveling mode according to the driving state, or may be capable of selecting one of the EV traveling mode or the parallel traveling mode, for example. Good.

  In the above-described embodiment, the changing unit changes each of the SOC of the battery and the requested output. However, it is not always necessary to change both, for example, only the SOC of the battery is changed. It may be.

10 Vehicle (hybrid vehicle)
DESCRIPTION OF SYMBOLS 11 Front motor 12 Rear motor 13 Engine 14 Front drive transmission mechanism 15 Front wheel 16 Rear drive transmission mechanism 17 Rear wheel 18 Front motor inverter 19 Battery 20 Rear motor inverter 21 DC / DC converter 22 Sub battery 23 Car charger 24 Fuel tank 25 Output system 26 Generator 27 Generator Inverter 28 Clutch 30 Control Device 31 Motor Control Unit 32 Engine Control Unit 33 Selection Control Unit 34 SOC Detection Unit (Charge State Detection Unit)
35 Request output calculation means (request output detection means)
36 selecting means 37 fuel deterioration judging means 38 changing means 39 battery sensor 40 accelerator position sensor 41 storage unit 42 fuel level sensor 43 fueling reservation judging means 44 fueling reservation switch

Claims (4)

A vehicle driving motor that operates by electric power supplied from a battery and applies driving force to the vehicle;
A vehicle driving or generator driving engine that operates with fuel supplied from a fuel tank and applies driving force to the vehicle or generator;
Charge state detection means for detecting a charge value of the battery;
Fuel deterioration determination means for determining deterioration of the fuel;
The charging state detection means detects the first driving mode in which the vehicle is driven by the driving force of the motor while the engine is stopped and the second driving mode in which the vehicle is driven while driving the engine. Selection means for selecting the second travel mode when the charged value is equal to or lower than a predetermined charging threshold;
Changing means for changing the predetermined charging threshold to be higher when the fuel deterioration determining means determines that the fuel is deteriorated;
A control apparatus for a hybrid vehicle, comprising: Further comprising requested output detecting means for detecting the requested output of the vehicle,
The selection means selects the first travel mode when the charge value is larger than the predetermined charge threshold and the request output detected by the request output detection means is less than or equal to a predetermined request output threshold, Selecting the second running mode when the charge value is greater than the predetermined charge threshold and the request output detected by the request output detection means is greater than the predetermined request output threshold;
2. The hybrid vehicle control according to claim 1, wherein the changing unit changes the predetermined required output threshold to be low when the fuel deterioration determining unit determines that the fuel is deteriorated. 3. apparatus.   3. The control apparatus for a hybrid vehicle according to claim 1, wherein the fuel deterioration determination unit determines whether or not the fuel has deteriorated when the engine is cold. 4.   The fuel deterioration determining means determines the degree of deterioration of the fuel based on a state of fuel when the engine is cold and a state of fuel when the engine is in a temperate zone. The control apparatus of the hybrid vehicle as described in any one of these.

Images