JP6537181B2 - Cruise control display for electric vehicles - Google Patents

Description

  The present invention relates to a cruise control display device for an electric vehicle, which makes it possible for a driver to recognize whether the set vehicle speed is in a region where electricity consumption (power consumption rate) is poor when performing cruise driving by driving an electric motor.

  Conventionally, in cruise control with follow-up function, when the preceding vehicle is captured forward of the host vehicle by radar means, imaging means, or a combination of these radar means and imaging means, when the vehicle speed of the preceding vehicle is less than the set vehicle speed A predetermined inter-vehicle distance is opened to follow the preceding vehicle, and the vehicle speed is run at the set vehicle speed at a set vehicle speed when the vehicle speed of the preceding vehicle is faster than the set vehicle speed or when the preceding vehicle is not supplemented.

  In an electric car or a hybrid electric car, when the cruise travel is performed only with an electric motor, that is, EV travel, the target vehicle speed is set according to the presence or absence of the preceding vehicle and the set vehicle speed, and the battery speed is adjusted so that the actual vehicle speed becomes the target vehicle speed. The output power is controlled to generate the drive torque of the motor.

  As a display of the set vehicle speed, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2013-56596), a zone region surrounded by the current vehicle speed and the set vehicle speed at auto cruise along the meter along the outer periphery of the speedometer. There is disclosed a technology which is disposed to make it possible to instantly determine the difference between the set vehicle speed and the current vehicle speed. That is, according to the technique disclosed in this document, when the current vehicle speed is lower than the set vehicle speed, acceleration can be made, and when it is higher, it can be easily determined that the vehicle is decelerating.

  However, according to the technology disclosed in the above-mentioned document, it can be recognized that the vehicle speed is accelerated if the actual vehicle speed is lower than the set vehicle speed and decelerated if the actual vehicle speed is faster than the set vehicle speed. It is not possible to determine if it is possible.

  In order to cope with this, for example, in Patent Document 2 (Japanese Patent No. 5040366), when fuel economy setting auto cruise control is executed, a target fuel efficiency is first set, and then maintainable in a range satisfying the target fuel efficiency There is disclosed a technology for obtaining a maximum cruise speed representing the highest vehicle speed and displaying the maximum cruise speed. Thereby, the driver can realize economic traveling by setting the set vehicle speed with the displayed maximum cruise speed as a pointer.

JP, 2013-56596, A Patent No. 5040366

  By the way, although the maximum cruise speed disclosed in Patent Document 2 mentioned above shows a guideline that enables economic driving (fuel efficiency) by engine driving, economic driving (electricity efficiency) by a motor is an engine Because of the difference between the characteristics and the maximum cruise speed of the engine can not be applied to the motor as it is because of the difference in characteristics, it is difficult for the driver to clearly present the economic travel guidelines when setting the set vehicle speed. is there.

  An object of the present invention is to provide a cruise control display device for an electric vehicle which can easily recognize a set vehicle speed with good electric power efficiency.

  A cruise control display device for an electric vehicle according to the present invention comprises set vehicle speed reading means for reading set vehicle speed at cruise control set by the driver, set vehicle speed display means for displaying the set vehicle speed, output torque of the electric motor and high voltage Field weakening control start vehicle speed estimation means for estimating the start vehicle speed of field weakening control performed to reduce the back electromotive force generated in the motor based on the battery voltage of the battery and the weakening estimated by the field weakening control start vehicle speed estimation means Vehicle speed comparison means for comparing the start vehicle speed of field control and the set vehicle speed read by the set vehicle speed reading means, and the vehicle speed display when the set vehicle speed is determined to be equal to or more than the start vehicle speed for field weakening control Display color setting means for displaying the set vehicle speed displayed on the means in a warning color

  According to the present invention, when the set vehicle speed set by the driver is equal to or more than the start vehicle speed for field-weakening control, the set vehicle speed displayed on the vehicle speed display means is displayed in the alerting color. It can be easily recognized whether the vehicle speed is efficient or not.

Front view of an instrument panel according to a first embodiment of the present invention Front view of the same combination meter Explanatory drawing showing the display state of the same multi-function display Same as the cruise control device Similarly, a flowchart showing the set vehicle speed display routine Similarly, a flowchart showing the set vehicle speed and electricity consumption worsening zone display routine The same figure, a schematic view of field weakening control start vehicle speed map A flowchart showing a set vehicle speed display routine according to the second embodiment of the present invention

  Hereinafter, an embodiment of the present invention will be described based on the drawings.

First Embodiment
1 to 7 show a first embodiment of the present invention. FIG. 1 shows an instrument panel (hereinafter referred to as “instrument panel”) 2 disposed along the vehicle width direction at the front of the vehicle compartment of the vehicle 1, and a combination on the driver's side of the instrument panel 2 A meter (hereinafter referred to as "combi meter") 3 is disposed, and a multi-function display (hereinafter referred to as "MFD" 4) as information display means by color liquid crystal display is disposed substantially at the center in the vehicle width direction. It is done. Further, a steering wheel 5 is disposed in front of the combination meter 3, and a cruise control (hereinafter, abbreviated as “kurukon”) operation unit 6 is provided on the steering wheel 5. The vehicle 1 adopted in the present embodiment is a hybrid electric vehicle, and traveling at the time of operation of the wheel controller is basically performed by EV traveling by driving only an electric motor. However, the present embodiment is naturally applicable to an electric vehicle.

  The MFD 4 displays various information regarding traveling of the vehicle for each mode. For example, as shown in FIG. 3, in the klucon display mode, the first klucon meter 4 a can be displayed by an arc-shaped bar meter, and a pointer 4 b indicating the current vehicle speed S with respect to the first klucon meter 4 a. And a cursor 4c (in the figure, Sset = 80 [Km / h]) indicating the set vehicle speed Sset and a cost deterioration zone 4d (in the figure, 90 to 100 [Km / h]) indicating an area where the cost efficiency deteriorates. Is displayed.

  In addition, the setting of the cruise control operation such as a cruise control switch (down switch, up switch), an inter-vehicle distance setting switch, etc. for setting the set vehicle speed Sset when the driver cruises the host vehicle is set and released The various switches required for the

  Further, as shown in FIG. 2, the combimeter 3 is provided with a tachometer 3a and a speedometer 3b on the left and right, and a multi-information display (hereinafter abbreviated as "MID") 7 of color liquid crystal display at the center. It is done. The tachometer 3a is provided with a water temperature gauge 3c, and the speedometer 3b is provided with a fuel gauge 3d.

  This MID 7 switches and displays various information such as traveling distance, electricity cost, torque, etc. for each mode on a plurality of display screens. For example, as shown in FIG. A set vehicle speed display section 7a as set vehicle speed display means for displaying the set vehicle speed Sset, and an inter-vehicle distance display section 7b for displaying the set inter-vehicle distance at the time of follow-up are displayed.

  In addition, a second torque converter 8 having a function as a set vehicle speed display means is provided on the outer periphery of the speedometer 3b. The second crcon meter 8 is for displaying information during the klucon operation and is a color liquid crystal display, and is disposed along the speed scale portion 3e displayed on the speedometer 3b, and this speed scale portion In correspondence with 3e, display is possible with a concentric arc-shaped bar meter in a settable range of the set vehicle speed Sset. In the present embodiment, the lowest vehicle speed at which the set vehicle speed Sset can be set is 40 [Km / h] and the highest vehicle speed is 100 [Km / h}. It is set in the range of the speed scale 3e corresponding to 100 [Km / h].

  As shown in an enlarged manner in part II of FIG. 2, at the time of the rotary control, the second rotary controller 8 shows a cursor 8 a (80 [Km / h] in the figure) indicating the set vehicle speed Sset and a region where the power consumption efficiency deteriorates. The cost deterioration zone 8 b (90 to 100 [Km / h] in the figure) is displayed.

In addition, as shown in FIG. 4, a crucco unit (hereinafter referred to as "cruise_ECU") 11 mounted on the vehicle 1 is mainly composed of a microcomputer, and has a known CPU, ROM, RAM, and nonvolatile memory. The ROM stores various programs executed by the CPU, fixed data typified by a map, and the like. The CPU performs the speed control of the vehicle according to the program stored in the ROM. That is, the constant speed cruise control for causing the vehicle 1 to travel at the set vehicle speed Sset set by the driver is executed, and when the preceding vehicle is captured, the preceding vehicle speed and the set vehicle speed Sset are compared. The cruise control is executed to follow the preceding vehicle by opening a predetermined inter-vehicle distance. Furthermore, the cruise control ECU 11 displays the set vehicle speed at the time of the klucon operation in addition to the klucon vehicle speed control at the time of the above-mentioned klucon operation. It has a crcon display calculation function to indicate whether or not good economic travel with the electricity cost "Wh / km" is possible, and the electricity efficiency is poor, as indicated by the display color.

  A signal (cruise switch signal) from a cruise control switch provided on a cruise control operation section 6 operated by the driver to start and stop the cruise control as parameters necessary for executing a cruise control display operation on the input side of the cruise_ECU 11; The vehicle speed S of the vehicle 1 (the vehicle speed S), the set vehicle speed Sset, and the battery voltage VB of the high voltage battery are input. Further, on the output side of the cruise_ECU 11, an MFD 4, an MID 7, and a second cruise meter 8 are connected to display the set vehicle speed and the like at the time of the cruise control operation.

  Specifically, the cruise control display operation processed by the cruise_ECU 11 is executed in accordance with a set vehicle speed display routine shown in FIG. 5 and a set vehicle speed and electricity consumption worsened zone display routine shown in FIG. Then, the display color of the set vehicle speed Sset obtained in the set vehicle speed display routine is displayed on the set vehicle speed display section 7a of MID 7, while the set vehicle speed Sset obtained in the set vehicle speed and electricity cost worsening zone display routine and the electricity cost worsening zone Are displayed in the power consumption deterioration zones 4 d and 8 b of the MFD 4 and the second curcon meter 8.

  First, a routine for setting the display of the set vehicle speed Sset displayed on the set vehicle speed display section 7a of MID 7 will be described according to the flowchart shown in FIG.

  This routine is executed every predetermined operation cycle after the cruise_ECU 11 is activated. First, the cruise switch signal is read in step S1 to check whether the cruise switch is turned on or not, and in the case of OFF, until the ON signal is received stand by. When the ON signal is received, the process proceeds to step S2, and the set vehicle speed Sset set by the driver is read. The processing at this step corresponds to the set vehicle speed reading means of the present invention.

  Then, the process proceeds to step S3, and the vehicle speed β at which field weakening control is started is calculated. The processing in this step corresponds to the field weakening control start vehicle speed estimating means of the present invention.

  As a motor mounted on an electric vehicle or a hybrid electric vehicle, an AC synchronous motor (PM motor: Permanent Magnet Motor) using a permanent magnet for a rotor is adopted in many cases. In this PM motor, when priority is given to torque output in the low speed rotation range which is a practical use range, the back electromotive force becomes large in the high speed rotation range, and the current does not flow because the internal induced voltage of the motor approaches the battery voltage VB of the high voltage battery. It will be difficult to rotate more. Therefore, field weakening control is performed when the back electromotive force becomes large, and the maximum rotation speed of the motor is further increased by reducing the back electromotive force.

  However, since field weakening control consumes power, the cost efficiency is reduced. When the set vehicle speed Sset is set to the high speed side even during the turning operation, the motor control ECU (not shown) executes the field weakening control in order to secure the high rotation number.

  The cruise_ECU 11 estimates the vehicle speed β at the start of the field weakening control when the driver sets the set vehicle speed Sset. That is, the field-weakening control start vehicle speed β can be roughly estimated from the maximum torque of the motor and the battery voltage VB of the high voltage battery. The field-weakening control start vehicle speed map shown in FIG. 7 is obtained by simulating the relationship between the maximum value (maximum torque) Tβ of the output torque obtained from the characteristics of the motor, the battery voltage VB of the high voltage battery and the vehicle speed (= motor rotational speed). The field weakening control is started when the vehicle speed is further increased beyond the region of the maximum torque Tβ. Therefore, the vehicle speed (= number of revolutions) when the output torque of the motor driven by each battery voltage (VB1 to VB5) falls from the maximum torque Tβ is estimated and set as a rough field-weakening control start vehicle speed β. In FIG. 7, equal voltage lines obtained by dividing the battery voltage VB of the high voltage battery into predetermined voltages (VB1 to VB5 in the drawing) are preset by simulation or the like.

  Incidentally, when the field-weakening control start vehicle speed β is determined with higher accuracy, the required torque is determined from the traveling resistance of the vehicle, etc., and the armature torque is determined from the required torque, the PM motor parameter and any vehicle speed (= motor rotation speed). To determine the degree of modulation m which is the ratio to the battery voltage VB. A vehicle speed exceeding the set value γ at which the modulation degree m starts field-weakening control is estimated and set as the field-weakening control start vehicle speed β.

  In step S3, the vehicle speed β at which field weakening control is started is set based on the battery voltage VB of the high voltage battery and the output torque with reference to the field weakening control start vehicle speed map. For example, as shown in FIG. 7, when the battery voltage VB of the high voltage battery is VB3, the vehicle speed at which the maximum torque Tβ drops is the field-weakening control start vehicle speed β at the battery voltage VB3. Therefore, if the driver sets the set vehicle speed Sset to a speed higher than the vehicle speed β, the power consumption efficiency is reduced by the power consumption by the field weakening control.

  Thereafter, the process proceeds to step S4, and the set vehicle speed Sset set by the driver is compared with the field weakening control start vehicle speed β. If the set vehicle speed Sset is equal to or greater than the field weakening control start vehicle speed β (Sset β β), the process proceeds to step S5. If the set vehicle speed Sset is less than the field-weakening control start vehicle speed β (Sset <β), the process proceeds to step S6. The processing in step S4 corresponds to the vehicle speed comparison means of the present invention.

  In step S5, the display color of the set vehicle speed Sset (80 [Km / h] in FIG. 2) displayed on the set vehicle speed display section 7a of MID 7 is set to red, which is a warning color, and the power consumption efficiency deteriorates. The driver is informed of the region and the routine is exited. On the other hand, when the process proceeds to step S6, the display color of the set vehicle speed Sset displayed on the set vehicle speed display unit 7a is set to white, the driver is informed that the region is good in the power consumption efficiency, and the routine is exited. The processing in steps S5 and 6 corresponds to the display color setting means of the present invention.

  As a result, when setting the set vehicle speed Sset, the driver can instantly determine whether the power consumption efficiency of the desired set vehicle speed Sset is good or bad when setting the set vehicle speed Sset. Also, when the set vehicle speed Sset displayed in the set vehicle speed display section 7a is displayed in red, the vehicle 1 is always set at a good set vehicle speed Sset with good power consumption efficiency by lowering the set vehicle speed Sset until the display color changes to white. Can run at a constant speed.

  Next, the display of the MFD 4 and the set vehicle speed Sset displayed on the second torque converter 8 disposed on the outer periphery of the speedometer 3b and the display of the electricity consumption deterioration zones 4d and 8b will be described according to the flowchart shown in FIG.

  This flowchart is executed following the set vehicle speed display routine described above. First, at step S11, the set vehicle speed Sset set by the driver is read, and at step S12, the cursors 4c and 8a indicating the set vehicle speed Sset are displayed. The information is displayed on the first curcone meter 4 a having the function of the set vehicle speed display means displayed on the MFD 4 and on the second curcone meter 8. In FIG. 2 and FIG. 3, the state where the set vehicle speed Sset is set to 80 [Km / h] is shown by the cursors 4c and 8a of inverse triangles.

  Thereafter, the process proceeds to step S13, and the field weakening control start vehicle speed β set in the set vehicle speed display routine described above is read. In step S14, the maximum vehicle speed of the set vehicle speed Sset from the field weakening control start vehicle speed β (100 Km / in this embodiment). h)) is set as the electricity cost deterioration zone (see FIG. 7).

  Next, the process proceeds to step S15, the display color of the first crucometer 4a and the second cruccommeter corresponding to the set electricity cost deterioration zone is set to red which is a warning color, and the routine is exited. As a result, as shown in FIG. 3 and part II of FIG. 2, the set vehicle speed Sset set by the driver and the electricity cost worsening zones 4d and 8b displayed in red on the first and second Is displayed. The driver visually recognizes the displays of the two klucon meters 4a and 8 to determine how much the set vehicle speed Sset set by the driver is more than the electricity consumption deterioration zones 4d and 8b, or the set vehicle speed Sset is the electricity consumption deterioration zone 4d , 8b, it is possible to instantly grasp how fast the set vehicle speed Sset can be traveled at a good electricity cost if the set vehicle speed Sset is lowered.

Second Embodiment
FIG. 8 shows a second embodiment of the present invention. The set vehicle speed display routine shown in FIG. 8 is applied in place of the set vehicle speed display routine shown in FIG. In the routine shown in FIG. 5, the set vehicle speed Sset set by the driver is set regardless of whether or not the electricity consumption worsening zones 4 d and 8 b are present. In the case where the set vehicle speed Sset is set as the field weakening control start vehicle speed β, the set vehicle speed Sset is forcibly set.

  First, in steps S21 to S24, the same processing as steps S1 to S4 shown in FIG. 5 is performed, and in step S24, if it is determined that set vehicle speed Sset β β, the process proceeds to step S25 and field weakening control is performed for set vehicle speed Sset. The start vehicle speed β is set as the limit vehicle speed (Sset ← β). Then, in step S26, the display color of the set vehicle speed Sset is set to red, which is a warning color, and the routine is exited. The process at step S25 corresponds to the limit vehicle speed setting means of the present invention.

  The driver visually recognizes that the color setting of the set vehicle speed Sset displayed on the set vehicle speed display unit 7a (see FIG. 2) of MID 7 is red, so that the displayed set vehicle speed Sset is the electricity cost deterioration zones 4d and 8b. It can be recognized that the lower limit value of.

  On the other hand, when the driver recognizes that the set vehicle speed Sset displayed on the set vehicle speed display 7a of MID 7 is red and lowers the set vehicle speed Sset, the process branches from step S24 to step S27 and the set vehicle speed The set vehicle speed Sset displayed on the display unit 7a is updated to the set vehicle speed Sset at which the driver performs the down operation. Then, the process proceeds to step S28, the display color of the set vehicle speed Sset is set to white, and the routine is exited.

  Although the description is omitted, a cursor 4c indicating the set vehicle speed Sset displayed on the first crucometer 4a (see FIG. 3) displayed on the MFD 4 and the second crucometer 8 displayed on the outer periphery of the speedometer 3b. , 8a are displayed corresponding to the set vehicle speed Sset set in the set vehicle speed display routine executed in the present embodiment. Therefore, when the set vehicle speed Sset set by the driver is in the power consumption deterioration zones 4d and 8b, the cursors 4c and 8a are displayed at the lower limit values of the power consumption deterioration zones 4d and 8b, that is, the position of the field weakening control start vehicle speed β. The processes in steps S26 and S28 correspond to the display color setting means of the present invention.

  As described above, according to the present embodiment, when the set vehicle speed Sset set by the driver is in the cost deterioration zones 4d and 8b, the set vehicle speed Sset is forcibly set with the field weakening control start vehicle speed β as the upper limit limiter. Therefore, good power consumption efficiency can be obtained.

  The present invention is not limited to the above-described embodiments. For example, only one of the first and second crunchmeters 4a and 8 may be provided. Alternatively, both of the crucometers 4a and 8 may be omitted.

  When the set vehicle speed displayed on the set vehicle speed display section 7a is displayed in red, it may be blinked.

1 ... vehicle,
2 ... Instrument panel,
3 ... Combimeter,
3a ... tachometer,
3b ... speedometer,
3e ... speed scale,
4a ... 1st curcon meter,
4b ... Guideline,
4c, 8a ... cursor,
4d, 8b ... cost deterioration zone,
5 ... steering wheel,
6 ... Cruise control operation unit,
7a ... set vehicle speed indicator,
7b ... distance display unit,
8 ... 2nd curcon meter,
11 ... Cruise control unit,
S: Vehicle speed,
Sset ... set vehicle speed,
VB ... battery voltage,
β ... Field control start vehicle speed

Claims (7)

Set vehicle speed reading means for reading the set vehicle speed at cruise control set by the driver;
Set vehicle speed display means for displaying the set vehicle speed;
Field-weakening control start vehicle speed estimation means for estimating the start vehicle speed of field-weakening control performed to reduce the back electromotive force generated in the motor based on the output torque of the motor and the battery voltage of the high voltage battery;
Vehicle speed comparison means for comparing the start vehicle speed of the field weakening control estimated by the field weakening control start vehicle speed estimation means with the set vehicle speed read by the set vehicle speed reading means;
A display color setting unit configured to display the set vehicle speed displayed on the vehicle speed display unit in a warning color when the vehicle speed comparison unit determines that the set vehicle speed is equal to or higher than the start vehicle speed of the field weakening control; Cruise control display for electric vehicles. The vehicle speed comparison means further includes limit vehicle speed setting means for causing the vehicle speed display means to display the start vehicle speed of the field weakening control on the set vehicle speed display means when the set vehicle speed is determined to be equal to or higher than the start vehicle speed of the field weakening control. A cruise control display device for an electric vehicle according to claim 1, characterized in that: The cruise control of the electric vehicle according to claim 1 or 2, further comprising cruise control meter display means for displaying as a power consumption deterioration zone between the start vehicle speed of the field weakening control and the maximum vehicle speed which can be set by the set vehicle speed. Display device. 4. The cruise control display device for an electric vehicle according to claim 3, wherein said cruise control meter display means is disposed along a speedometer. 4. The cruise control display device for an electric vehicle according to claim 3, wherein said cruise control meter display means is provided in an information display means provided on an instrument panel. The cruise control display device for an electric vehicle according to any one of claims 3 to 5, wherein the cruise control meter display means is capable of displaying on a bar meter. The cruise control display apparatus for an electric vehicle according to any one of claims 3 to 6, wherein the cruise control meter display means displays the electricity consumption deterioration zone in a warning color.