JP2014227024A - Hybrid-vehicle display control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid-vehicle display control device capable of allowing a driver to recognize how to operate an accelerator pedal for eliminating a power circulation.SOLUTION: A display control device applied to a hybrid vehicle 1 includes: a planetary gear mechanism 21 capable of allotting power of an internal combustion engine 11 to a first MG 12 and an output part 15; and a second MG 13 capable of outputting power to the output part 15, includes a display device 40 that displays a target indicator 42a corresponding to an accelerator opening degree with which a travel state generating no power circulation is switched to a travel state generating a power circulation, and displays a zone 43 changing with the accelerator opening degree. The display device 40 displays the zone 43 so that a right end 43a moves further from the target indicator 42a as the power circulating between the first MG 12 and the second MG 13 increases.

Description

  The present invention is applied to a hybrid vehicle in which the power of the internal combustion engine can be distributed to the first motor / generator and the drive wheels by the differential mechanism, and the power of the second motor / generator can be output to the drive wheels. The present invention relates to a display control device.

  A hybrid vehicle is known in which the power of the internal combustion engine can be distributed to the first motor / generator and the drive wheels by a differential mechanism such as a planetary gear mechanism, and the power of the second motor / generator can be output to the drive wheels. ing. As a display device provided in such a hybrid vehicle, there is known a device that turns on an eco lamp when the accelerator opening is smaller than a predetermined threshold and turns off the eco lamp when the accelerator opening is larger than a threshold. In addition, there is known a display device that changes a threshold value to a region that becomes a boundary of power circulation when the occurrence of power circulation is estimated, thereby notifying the driver that power circulation may occur. (See Patent Document 1).

JP 2008-174100 A

  In the device of Patent Document 1, only the driver is notified of whether or not power circulation occurs using an eco lamp. Therefore, when power circulation occurs, the driver may not know how to adjust the accelerator opening to eliminate the power circulation.

  Therefore, an object of the present invention is to provide a display control device for a hybrid vehicle that allows a driver to recognize how to operate an accelerator pedal in order to eliminate power circulation.

  The display control device of the present invention includes an internal combustion engine, a first motor / generator, an output unit for transmitting power to driving wheels, and three rotating elements that are differentially rotatable with respect to each other. A differential mechanism in which a first rotating element of the rotating elements is connected to the internal combustion engine, a second rotating element is connected to the first motor / generator, and a third rotating element is connected to the output unit; Applied to a hybrid vehicle including a second motor / generator capable of outputting power to an output unit, and display means provided at a position where the driver of the vehicle can visually recognize, the first motor / generator, and the The vehicle travels in a traveling state in which power circulation occurs in which at least part of the electric power generated by one of the second motor / generators is consumed by the other motor / generator. A target indicator corresponding to an accelerator opening degree for switching from a running state in which the power circulation does not occur to a running state in which the power circulation occurs and an indication indicator corresponding to the current accelerator opening are displayed on the display means. Display control means, wherein the indication control means increases the magnitude of power circulating between the one motor generator and the other motor generator as the indication index becomes the target index. The indicator is displayed on the display means so as to be away from the camera (claim 1).

  According to the display control device of the present invention, the instruction index is farther from the target index as the magnitude of the power circulating between the one motor generator and the other motor generator is larger. This makes it possible for the driver to know that the accelerator opening should be adjusted so as to approach the vehicle. Therefore, the driver can recognize how to operate the accelerator pedal in order to eliminate the power circulation. When the driver adjusts the accelerator opening so that the indication index approaches the target index, the magnitude of the power circulating between one motor / generator and the other motor / generator is reduced. it can. Therefore, fuel consumption can be improved.

  In one form of the display control device of the present invention, in the vehicle, the power circulation occurs when the vehicle travels at a vehicle speed higher than a predetermined specific vehicle speed, and the display control means A value obtained by dividing the travel time traveled by the total travel time during which the vehicle traveled at a vehicle speed equal to or higher than the specific vehicle speed may be displayed on the display means. The value calculated in this way becomes larger as the driving time becomes longer with power circulation occurring. Therefore, the greater this value, the worse the fuel consumption. By displaying such values on the display means, it is possible to prompt the driver to adjust the accelerator opening so as to eliminate the power circulation.

  As described above, according to the display control apparatus of the present invention, the instruction displayed on the display means as the magnitude of power circulating between one motor generator and the other motor generator increases. Since the index is far from the target index, the driver can know that the accelerator opening should be adjusted so that the instruction index approaches the target index. Therefore, the driver can recognize how to operate the accelerator pedal in order to eliminate the power circulation.

1 is a diagram schematically showing a hybrid vehicle to which a display control device according to one embodiment of the present invention is applied. The figure which shows an example of a nomograph when driving wheels are driven by both the engine and the second MG in the engine travel mode. The figure which shows the ECO meter displayed on a display apparatus. The figure which shows an example of the fuel consumption meter displayed on a display apparatus.

  FIG. 1 schematically shows a vehicle in which a display control device according to one embodiment of the present invention is incorporated. The vehicle 1 is configured as a so-called hybrid vehicle. The vehicle 1 includes an internal combustion engine (hereinafter may be referred to as an engine) 11, a first motor / generator (hereinafter also referred to as a first MG) 12, and a second motor / generator (hereinafter referred to as a first motor / generator). 2MG) .13). Since the engine 11 is a well-known internal combustion engine mounted on a hybrid vehicle, detailed description thereof is omitted. The first MG 12 and the second MG 13 are well-known motor generators that function as an electric motor and a generator. The first MG 12 includes a rotor 12b that rotates integrally with the output shaft 12a, and a stator 12c that is coaxially disposed on the outer periphery of the rotor 12b and fixed to a case (not shown). Similarly, the second MG 13 includes a rotor 13b that rotates integrally with the output shaft 13a, and a stator 13c that is coaxially disposed on the outer periphery of the rotor 13b and fixed to the case.

  The output shaft 11 b of the engine 11 and the output shaft 12 a of the first MG 12 are connected to the power split mechanism 14. An output unit 15 for transmitting power to the drive wheels 2 of the vehicle 1 is also connected to the power split mechanism 14. The output unit 15 includes a first drive gear 16, a counter gear 18 that meshes with the first drive gear 16 and is fixed to the counter shaft 17, and an output gear 19 that is fixed to the counter shaft 17. The output gear 19 meshes with a ring gear 20 a provided in the case of the differential mechanism 20. The differential mechanism 20 is a well-known mechanism that distributes the power transmitted to the ring gear 20 a to the left and right drive wheels 2. In FIG. 1, only one of the left and right drive wheels 2 is shown.

  The power split mechanism 14 includes a planetary gear mechanism 21 as a differential mechanism. The planetary gear mechanism 21 is a single pinion type planetary gear mechanism, and includes a sun gear S as an external gear, a ring gear R as an internal gear arranged coaxially with the sun gear S, and these gears S. , And a carrier C that holds the pinion gear P meshing with R so as to be capable of rotating and revolving around the sun gear S. The sun gear S is connected to the output shaft 12a of the first MG 12. The carrier C is connected to the output shaft 11 b of the engine 11. The ring gear R is connected to the first drive gear 16. Therefore, the sun gear S corresponds to the second rotating element of the present invention, the carrier C corresponds to the first rotating element of the present invention, and the ring gear R corresponds to the third rotating element of the present invention.

  As shown in this figure, a second drive gear 22 is provided on the output shaft 13 a of the second MG 13. The second drive gear 22 meshes with the counter gear 18. The first MG 12 and the second MG 13 are electrically connected to the battery 23 via an inverter and a boost converter (not shown).

  Operations of the engine 11, the first MG 12, and the second MG 13 are controlled by the vehicle control device 30. The vehicle control device 30 is configured as a computer unit including a microprocessor and peripheral devices such as RAM and ROM necessary for its operation. The vehicle control device 30 holds various control programs for causing the vehicle 1 to travel appropriately. The vehicle control device 30 executes control of the control target such as the engine 11 and the MGs 12 and 13 by executing these programs. Various sensors for acquiring information related to the vehicle 1 are connected to the vehicle control device 30. For example, a vehicle speed sensor 31 and an accelerator opening sensor 32 are connected to the vehicle control device 30. The vehicle speed sensor 31 outputs a signal corresponding to the speed (vehicle speed) of the vehicle 1. The accelerator opening sensor 32 outputs a signal corresponding to the accelerator pedal depression amount (accelerator opening). In addition to this, various sensors, switches, and the like are connected to the vehicle control device 30, but these are not shown.

  The vehicle 1 is provided with a display device 40 as display means. The display device 40 is provided at a position where the driver of the vehicle 1 can visually recognize, for example, in the instrument panel. As the display device 40, a known display device or the like may be used. Therefore, detailed description is omitted. As shown in this figure, the display device 40 is also connected to the vehicle control device 30.

  The vehicle 1 is provided with a plurality of travel modes. As the plurality of traveling modes, an EV traveling mode in which the driving wheels 2 are driven only by the second MG 13 and an engine traveling mode in which the driving wheels 2 are mainly driven by the engine 11 are provided. The vehicle control device 30 switches between these travel modes according to the vehicle speed, the accelerator opening, and the like. For example, the vehicle force control device 30 switches the travel mode to the EV travel mode when the vehicle speed is less than a predetermined first determination vehicle speed. On the other hand, the vehicle control device 30 switches the travel mode to the engine travel mode when the vehicle speed is equal to or higher than the first determination vehicle speed. Further, the vehicle control device 30 drives the drive wheels 2 by both the engine 11 and the second MG 13 when the vehicle speed becomes equal to or higher than a predetermined second determination vehicle speed. Note that a vehicle speed higher than the first determination vehicle speed is set as the second determination vehicle speed.

  FIG. 2 shows an example of an alignment chart when the drive wheels 2 are driven by both the engine 11 and the second MG 13 in the engine travel mode. In this figure, “MG1” indicates the first MG12, “ENG” indicates the engine 11, “MG2” indicates the second MG13, and “OUT” indicates the first drive gear 16. “S”, “C”, and “R” indicate the sun gear S, the carrier C, and the ring gear R of the planetary gear mechanism 21, respectively.

  As shown in this figure, in the engine running mode, the engine 11 is operated at a predetermined rotational speed with high thermal efficiency. Therefore, as indicated by the solid line L1, when the rotational speed of the first drive gear 16 is a predetermined rotational speed N, the rotational speed of the first MG 12 becomes zero. When the rotation speed of the first drive gear 16 is smaller than the rotation speed N as indicated by the alternate long and short dash line L2, the first MG 12 is operated in the normal rotation. Hereinafter, such a state may be referred to as power diversion. On the other hand, when the rotational speed of the first drive gear 16 is greater than the rotational speed N as indicated by a broken line L3, the first MG 12 is operated at a negative rotational speed.

  In these cases, it is necessary to output the reaction force for transmitting the rotation of the engine 11 to the first drive gear 16 from the first MG 12. In the vehicle 1, when it is necessary to operate the first MG 12 with negative rotation, the first MG 12 functions as a generator, and the first MG 12 generates electric power to generate a reaction force. As described above, in the traveling state shown in this figure, the driving wheel 2 is driven by the second MG 13. Therefore, in this case, at least a part of the power generated by the first MG 12 is consumed by the second MG 13. That is, power circulation occurs in the vehicle 1. As is well known, when power circulation occurs, the energy efficiency in the vehicle 1 decreases.

  As shown in FIG. 1, the first drive gear 16 meshes with the counter gear 18 of the counter shaft 17. Therefore, the rotation speed of the first drive gear 16 is determined according to the vehicle speed. Therefore, when the vehicle speed at which the rotation speed of the first drive gear 16 is N is the specific vehicle speed V, no power circulation occurs in the vehicle 1 when the vehicle speed is lower than the specific vehicle speed V. When the vehicle speed is the specific vehicle speed V, the rotation speed of the first MG 12 is zero. In this case, the energy consumed by the first MG 12 is the lowest. Therefore, the energy efficiency of the vehicle 1 is increased. Such an operating point is called a mechanical point. On the other hand, when the vehicle speed is higher than the specific vehicle speed V, power circulation occurs, so that the energy efficiency of the vehicle 1 decreases.

  The vehicle control device 30 changes the information displayed on the display device 40 according to the traveling state of the vehicle 1 in order to suppress the occurrence of power circulation. FIG. 3 shows an ECO meter 41 displayed on the display device 40 when the vehicle speed is lower than the specific vehicle speed V. As described above, when the vehicle speed is lower than the specific vehicle speed V, power circulation does not occur. Therefore, the display device 40 displays that the vehicle 1 is traveling in a traveling state in which no power circulation occurs.

  On the other hand, when the vehicle speed becomes equal to or higher than the specific vehicle speed V, the traveling state of the vehicle 1 becomes a traveling state in which power circulation occurs as described above. In this case, the fuel consumption meter 42 shown in FIG. 4 is displayed on the display device 40 instead of the ECO meter-41. The target index 42a indicated by a dotted line in this figure indicates the accelerator opening at which the vehicle speed becomes the specific vehicle speed V, that is, the accelerator opening at which the traveling state in which power circulation does not occur is switched to the traveling state in which power circulation occurs. When the vehicle speed is the specific vehicle speed V, it becomes a mechanical point, so that the energy efficiency of the vehicle 1 is increased. Therefore, this accelerator opening is set to the target accelerator opening. In the fuel consumption meter 42, a portion on the right side of the target indicator 42a is a region where power circulation is performed, and a portion on the left side of the target indicator 42a is a region where power splitting is performed.

  A region 43 in this figure indicates the current accelerator opening. And the magnitude | size of the area | region 43 changes according to an accelerator opening. As is clear from FIG. 2, the greater the vehicle speed is than the specific vehicle speed V, and the greater the difference between the vehicle speed and the specific vehicle speed V, the greater the magnitude of power circulated between the first MG 12 and the second MG 13. Therefore, the size of the region 43 is reduced as the difference between the vehicle speed and the specific vehicle speed V increases. In this case, the larger the power that circulates between the first MG 12 and the second MG 13 is, the farther the right end 43a of the region 43 is from the target index 42a. On the other hand, when the driver decreases the accelerator opening and the vehicle speed approaches the specific vehicle speed V, the region 43 increases, so the right end 43a of the region 43 approaches the target index 42a. The vehicle control device 30 changes the size of the region 43 while switching the meter displayed on the display device 40 based on the vehicle speed and the accelerator opening.

  As described above, in the present invention, when the vehicle speed becomes equal to or higher than the specific vehicle speed V, the fuel consumption meter 42 shown in FIG. And since the magnitude | size of the area | region 43 of this fuel consumption meter 42 changes according to an accelerator opening, it can be made to recognize how a driver should operate an accelerator pedal in order to eliminate power circulation. . In addition, when the driver adjusts the accelerator opening so that the right end 43a of the region 43 is close to the target index 42a, the power that circulates between the first MG 12 and the second MG 13 can be reduced, thereby improving fuel efficiency. Can do.

  In the present invention, in addition to the meters shown in FIGS. 3 and 4, a numerical value calculated by the following equation (1) may be displayed on the display device 40.

  The numerical value calculated by the equation (1) becomes larger as the driving time in the power circulation state becomes longer. Therefore, the greater this value, the worse the fuel consumption. By displaying such numerical values on the display device 40, it is possible to prompt the driver to adjust the accelerator opening so as to eliminate the power circulation. Although the travel time is used in the above-described equation (1), a travel distance may be used instead of the travel time.

  In the embodiment described above, the vehicle control device 30 functions as the display control means of the present invention by displaying the fuel consumption meter 42 shown in FIG. 4 on the display device 40. Further, the right end 43a of the region 43 corresponds to the indication index of the present invention.

  The present invention is not limited to the above-described form and can be implemented in various forms. For example, in the embodiment described above, a single pinion type planetary gear mechanism is used as the power split mechanism, but a double pinion type planetary gear mechanism may be used as the power split mechanism.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Drive wheel 11 Internal combustion engine 12 1st motor generator 13 2nd motor generator 15 Output part 21 Planetary gear mechanism (differential mechanism)
30 Vehicle control device (display control means)
40 Display device (display means)
42a Target index 43a Right end of area (indicator index)
S Sun gear (second rotating element)
R ring gear (third rotating element)
C carrier (first rotating element)
V Specific vehicle speed

Claims (2)

An internal combustion engine;
A first motor generator;
An output for transmitting power to the drive wheels;
Three rotational elements capable of differentially rotating with each other, a first rotational element of the three rotational elements is connected to the internal combustion engine, and a second rotational element is connected to the first motor / generator; A differential mechanism in which a third rotating element is connected to the output unit;
Applied to a hybrid vehicle including a second motor / generator capable of outputting power to the output unit;
Display means provided at a position visible to the driver of the vehicle;
The vehicle is in a traveling state in which power circulation occurs in which at least part of the electric power generated by one of the first motor generator and the second motor generator is consumed by the other motor generator. When the vehicle is traveling, the display includes a target index corresponding to an accelerator opening degree that switches from a traveling state where the power circulation does not occur to a traveling state where the power circulation occurs, and an indication index corresponding to the current accelerator opening degree. Display control means for displaying on the means,
The display control means sets the instruction index so that the instruction index is separated from the target index as the magnitude of power circulating between the one motor generator and the other motor generator increases. A display control device for displaying on the display means. In the vehicle, the power circulation occurs when the vehicle travels at a vehicle speed higher than a predetermined specific vehicle speed,
The display control means displays on the display means a value obtained by dividing the travel time in which the vehicle has traveled in a state where the power circulation has occurred divided by the total travel time in which the vehicle has traveled at a vehicle speed equal to or higher than the specific vehicle speed. The display control apparatus according to claim 1.

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