JP6025146B2 - Electric vehicle cruising distance notification device - Google Patents

Description

  The present invention relates to a cruising distance notification device for an electric vehicle capable of displaying how much a cruising distance can be traveled according to the remaining amount of a vehicle-mounted battery when traveling on an electric vehicle.

As conventional cruising distance notification devices for electric vehicles, those described in Patent Document 1 and Patent Document 2 are known.
In these conventional electric vehicle cruising distance notification devices, the navigation device specifies the main road closest to the current position of the electric vehicle and sets a temporary route from the current position to the main road or to the destination. The route is searched, and weather information on these routes is acquired from the weather information server. Then, using the predicted battery consumption when traveling on a temporary route that applies to the battery consumption conditions such as the weather information, the usage status of the vehicle equipment, the presence or absence of the generator, the vehicle is compared with the remaining capacity of the battery. Estimate possible distance.

JP 2012-145469 A JP 2012-242329 A

In the above prior art, the remaining cruising distance remaining is displayed depending on the remaining battery level, and the driver can recognize it, but if there is a slope on the way, the cruising distance to go is simply It may not be considered equal to the returnable range. For example, if there is a downhill on the way and a part of the braking energy is recovered by the motor / generator, but if the downhill becomes an uphill and consumes more electricity on the way back, the same mileage Even so, the electricity consumption required for going and returning will be different.
Therefore, if it goes on as it is, when returning the same way, it may become uneasy whether it can return to the memorized point (home or a predetermined charging equipment).

  The present invention has been made paying attention to the above problem, and the purpose of the present invention is to display whether or not the current battery level can be returned to the stored point when traveling back on the same road. It is an object of the present invention to provide an electric vehicle cruising distance notification device capable of notifying a driver or the like.

For this purpose, the cruising distance notification device for an electric vehicle according to the present invention comprises:
In an electric vehicle equipped with a navigation device and a regenerative energy device capable of recovering to a battery by converting energy into electricity on a downhill,
Charging detection means for detecting that charging has been performed;
And a predetermined point storing means you store where it detects that charging by the charging detecting means as a predetermined point,
Battery remaining amount detecting means for detecting the remaining amount of power of the battery;
The absolute value of the recovered power recovered by gradient resistance during the outward to the current land point from the given point, the estimated level ground traveling required power estimated required level ground traveling at backward in the same way by changing the sign Comparing the estimated required power amount as the power required for the added return path and the remaining power amount at the current point detected by the remaining battery amount detecting means, or based on the remaining power amount of the battery at the predetermined point Te, and turned back impossible judging means for determining that no longer return to the predetermined point on the way back Proceeding to more earlier,
A notifying means for notifying information relating to non-returnability when the non-returnable determination means determines non-returnability;
It is provided with.

Preferably, the non-returnable determining means includes an average power consumption calculating means for calculating an average power consumption from past travel data ,
A cruising distance is calculated based on the average power consumption calculated by the average power consumption calculating means and the remaining power at the predetermined point, and the point where the turnback is impossible is determined to be ½ of the cruising distance. is calculated as,
A cruising distance notification device for an electric vehicle.

Preferably, the non-returnable determining means includes virtual power consumption calculating means for calculating virtual power consumption when it is assumed that the electric vehicle is traveling on a flat ground.
A point where the virtual power consumption is half of the remaining power at the predetermined point is a point where it cannot be turned back.
It is characterized by that.

The non-returnable determining means integrates the power consumption and accumulated power consumed by the gradient resistance in the forward path from the predetermined point to the current point , and estimates that it is necessary for flat ground traveling on the same road The estimated required power amount is calculated as the power required for the return path by adding the sign to the estimated flat ground required power , and the point when the remaining battery power is equal to the estimated required power amount is not returned. As a possible point,
It is characterized by that.

In the electric vehicle cruising distance notification device of the present invention, even if there is a slope on the way to and from the same road, it is displayed to the driver or the like whether or not the current battery level can be returned to the stored point. I can inform you. As a result, the driver does not travel while worrying about insufficient battery power.
Further, the cruising distance notification device has charge detection means for detecting that charging has been performed, and the predetermined point storage means stores the place where the charging detection means has detected charging as a predetermined point. Therefore, if it returns, the position which can be charged reliably can be automatically updated.

Moreover, not determination means turned back has an average power consumption calculating means for calculating the average power consumption from the past travel data, wherein the predetermined point and the average power consumption amount calculated in the average power consumption calculating unit The cruising distance is calculated on the basis of the remaining amount of electric power at , and the point where the turnback is impossible is calculated as ½ of the cruising distance. It can be calculated with high accuracy.

Further, the non-returnable determining means has virtual power consumption calculating means for calculating virtual power consumption when it is assumed that the electric vehicle is running on a flat ground,
Since the point where the virtual power consumption is half of the remaining power at the predetermined point is set as a point that cannot be turned back, the point that cannot be turned back by simple calculation is accurately calculated. be able to.

Further, the non-returnable judging means integrates the power consumption and the accumulated power consumed by the gradient resistance in the forward path from the predetermined point to the current point , and is required for the flat road traveling on the return path on the same road. Calculate the estimated required power amount as the power required for the return path by adding the sign to the estimated estimated flat ground travel required power, and return the point when the remaining battery power is equal to the estimated required power amount Since it is set as the point which becomes impossible, the point which cannot be returned by simple calculation can be calculated accurately.

It is a block diagram which shows the structure of the cruising distance notification apparatus of the electric vehicle which concerns on Example 1 of this invention. It is a figure explaining the electric power consumption required for driving | running | working going back and forth by the electric vehicle of Example 1. FIG. It is a figure explaining the electric power consumption required on the going and going hill with the electric vehicle of Example 1. FIG. It is a figure explaining the action | operation with the cruising distance notification apparatus of the electric vehicle of Example 1. FIG. It is a figure which shows the simulation result about the relationship between a travel distance, an altitude, a gradient, electric power, and the cruising range.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

First, the overall configuration of the cruising distance notification device for an electric vehicle according to the first embodiment will be described.
As shown in FIG. 1, the electric vehicle on which the cruising distance notification device 1 according to the first embodiment is mounted includes a battery 2, a motor / generator 3, an inverter 4, a control device 5, and a navigation device 6. ing.

  The battery 2 can be charged and discharged with a secondary battery. The battery 2 is connected to each of the inverter 4 and the control device 5 to transfer power to and from the inverter 4, and to the control device 5 information such as the voltage, total voltage, and charge / discharge current of each cell of the battery 2 Supply.

The motor / generator 3 is connected to the inverter 4 and the control device 5, exchanges power with the inverter 4, and supplies information such as the rotation speed to the control device 5.
The motor / generator 3 functions as a drive motor when electric power controlled by the inverter 3 is supplied from the battery 2 to drive the electric vehicle, and functions as a generator when braking on a downhill or the like. Then, a part of the braking energy is recovered and electric power is stored in the battery 2 via the inverter 3. Further, as the motor / generator 3, for example, a three-phase AC motor is used.

  The inverter 4 is connected to the battery 2, the motor / generator 3, and the control device 5, and exchanges power with the former two as described above. From the control device 5, the inverter 4 receives DC power from the battery 2. Is converted into alternating current power and controlled to produce a variable voltage at a variable frequency.

The control device 5 is connected to the battery 2, the motor / generator 3, the inverter 4, the cruising distance notification device 1, etc., so that the battery information signal from the battery 2, the rotational speed signal from the rotational speed sensor of the motor / generator 3, the vehicle speed The vehicle speed signal from the signal, the accelerator opening signal from the accelerator pedal depression amount sensor, etc. are input, and the drive signal to the inverter 4 is generated and supplied to control the inverter 4, the remaining power of the battery 2, etc. To figure out.
Part of the information obtained by the control device 5 (such as the remaining power of the battery 2) is input to the cruising distance notification device 1.

  The navigation device 6 is connected to the cruising distance notification device 1 and can identify the current position of the vehicle based on the GPS signal from the satellite, and also stores a map and associated information to search for a driving route. Etc., and part of the information can be supplied to the cruising distance notification device 1.

  The cruising distance notification device 1 is connected to the control device 5 and the navigation device 6 as described above, and includes an input unit 1a, a liquid crystal display unit 1b and a speaker 1c as notification means, a control unit 1d, and a predetermined point. A storage unit 1e, an estimated required power calculation unit 1f, a battery remaining amount detection unit 1g, a non-returnable determination unit 1h, and a charge detection unit 1i are provided.

However, the input unit 1a, the liquid crystal display unit 1b, the speaker 1c, and the predetermined point storage unit 1e use the corresponding parts of the navigation device 6 as they are, and the battery remaining amount detection unit 1g is connected to the battery 2 from the control device 5. The control unit 1d, the estimated required power calculation unit 1f, and the non-returnable determination unit 1h only receive information on the remaining power, and the control unit and storage unit of the navigation device 6 store information data necessary for these functions. A part or all of the cruising distance notification device 1 may be shared with the hardware of the navigation device 6 so as to be stored and controlled. In this embodiment, the cruising distance notification device 1 and the navigation device 6 are separated from each other for easy understanding.
The battery remaining amount detecting unit 1g corresponds to the battery remaining amount detecting means of the present invention.

  The input unit 1a is a part for inputting a predetermined point, for example, a home, a place where there is a nearby or used charging facility, or a destination, and is a push button provided on the remote control body or a screen of the display unit 1b. It is composed of the touch sensor provided above.

  When the display unit 1b and the speaker 1c are connected to the control unit 1d and the non-returnable determination unit 1h determines that they cannot be returned, the display unit 1b and the point are notified and notified by voice. Note that either notification may be used.

  The control unit 1d is composed of a microcomputer and programs and data stored in the microcomputer, and is connected to each of the above-described units. The controller 1d exchanges signals with these units and controls these units.

The predetermined point storage unit 1e stores data such as the location of the predetermined point input by the input unit 1a and the location where there is a charged charging facility described later.
The estimated required power calculation unit 1f adds power that is larger than the absolute value of the power collected on the downhill in the middle to the power consumption consumed by the flat ground traveling from the predetermined point to the local point, and on the same road Calculated as the estimated required power estimated to be required on the way back. This will be described in detail later.
The predetermined point storage unit 1e corresponds to the predetermined point storage means of the present invention.

The non-returnable determining unit 1h compares the remaining power detected by the battery remaining amount detecting means with the estimated required power estimated by the estimated required power calculating means, and if it proceeds further, it can return to a predetermined point on the way back. Judge that it will disappear. This will be described in detail later.
The non-returnable determination unit 1h corresponds to non-returnable determination means of the present invention.

The charging detector 1i detects when the battery 2 of the electric vehicle is charged from an external charging facility, reads the position from the navigation device 6, and stores this position as a predetermined point in the predetermined point storage unit 1e. Let
The charge detection unit 1i corresponds to the charge detection means of the present invention.

The operation of the electric vehicle cruising distance notification device 1 of the first embodiment configured as described above will be described below.
As shown in FIG. 2 (a), when an electric vehicle travels, traveling resistance including air resistance and rolling resistance and gradient resistance on slopes act on the electric vehicle. Depending on the size of the vehicle, it can be in any state of acceleration travel, low speed travel, and deceleration travel.

The relationship between these energies is shown in FIG. This figure shows only the traveling part on the same hill where the going is a downhill and the return is an uphill, and is intended to elucidate the relationship between the power consumption of the uphill and downhill on this hill.
This is because the difference in power consumption is not so large if the running resistance travels at the same speed and acceleration / deceleration on flat ground, whereas the motor / generator 3 is used as a generator on the downhill like an electric vehicle. This is because part of the energy is recovered, but on the uphill, the motor / generator 3 must be used as a drive motor to supply power from the battery 2 more than when traveling on flat ground.

In the figure, the energy going to the left half is shown, and the energy returning to the right half is shown. Also, in the figure, when the energy arrow is pointing up, energy is collected and power is being charged and stored in the battery 2, and when the arrow is pointing down, power is drawn from the battery 2. Indicates that the battery is discharged.
The sensation between the horizontal dotted lines that are separated vertically represents the remaining amount of electric power (remaining energy) of the battery 2 when the vehicle is started.

To go down the hill, energy Ea for overcoming running resistance (such as air resistance and rolling resistance) and mechanical loss Eη generated in parts in the electric vehicle are required. On the downhill, on the other hand, the motor / generator 3 functions as a generator and collects energy Ee corresponding to the gradient resistance.
Therefore, the total energy Ego required on the going downhill is Ea + Eη−Ee. In the example of this figure, the absolute value of the energy Ego exceeds Ea + Eη, and the energy is stored in the battery 2 correspondingly. In the figure, the energy increases to the position of the solid line above the upper dotted line.

On the other hand, in order to climb the hill on the way back, the energy Ea for overcoming the running resistance, the energy Eη for overcoming the mechanical loss, and the energy Ee for overcoming the gradient resistance are required from the position of the solid line. That is, the total energy Ert required for climbing is Ea + Eη + Ee.
Therefore, when going back and forth on this slope, the total energy E of the electric vehicle required for this round trip becomes Ego + Ert = 2 (Ea + Eη), and the gradient resistance is offset, so the energy required for the round trip This does not have to include the gradient.

  FIG. 3 illustrates the above description. That is, in the same figure, as shown in the upper part, the altitude is the same at the beginning of the descending and the end of the ascending at both ends of the same hill and at the both ends of the travel distance (the potential energy is unchanged). In the lower part of the figure, the horizontal axis indicates the travel distance, and the vertical axis indicates the remaining power of the battery 2. The dotted line indicates the remaining power level in the case of flat ground, and the solid line indicates the remaining power level of the battery 2 when traveling on the slope.

Then, since the energy is recovered by going down the hill at the beginning, the remaining power of the battery 2 has a gentler slope than when running on flat ground, and the energy in the vertical line surrounded by the solid and dotted lines. Will be preserved as the energy increment obtained with the gradient resistance.
On the other hand, since the return goes up the hill, a corresponding cavity force is required and power is consumed. That is, the solid line indicating the remaining amount of power of the battery 2 has a steeper slope than the dotted line in the case of traveling on flat ground.
And the horizontal line part enclosed by this solid line and a dotted line must discharge more as compared with the time of driving | running | working on a flat ground as an energy component for overcoming gradient resistance.
However, as described above, the energy of the vertical line portion and the horizontal line portion is equal (actually, it can be regarded as substantially equal).

As can be seen from these explanations, the non-returnable determination unit 1h is
Cruising distance (at the time of departure) [m] = average power consumption [m / Wh] × (remaining power at the time of departure) [Wh]
Calculate the cruising range with
Returnable travel distance [m] = cruising distance (at departure) [m] / 2
Calculate the mileage that can be returned with.
Then, it is determined that it is impossible to turn back at a point where travelable distance> returnable distance.
Here, the average power consumption is calculated from past driving data,
Average power consumption [m / Kw] = total mileage [m] / total power consumption [Wh]
Ask from. This calculation program and control unit 1d corresponds to the average power consumption calculation means of the present invention.

Alternatively, as another determination method, the non-returnable determination unit 1h calculates the power consumption (Ea + Eη) assuming a flat ground traveling and compares the remaining power of the battery 2 with the non-returnable determination. Also good.
In other words, hypothetical power consumption (Ea + Eη) [Wh] = ∫ (running resistance excluding gradient resistance x vehicle speed / efficiency) dt when assuming flat road running
Is calculated. The arithmetic program and the control unit 1d correspond to virtual power consumption calculation means of the present invention.
Also,
Virtual power remaining [Kw] that can be returned = Battery remaining power (at departure) / 2
Is calculated.
Then, it is determined that it is impossible to turn back at a point where virtual power consumption when assuming flat road traveling> remaining virtual power remaining that can be turned back.

FIG. 4 is a diagram for explaining the latter determination. A cruising distance prediction value according to the prior art is shown by a solid line in a graph similar to FIG.
On the other hand, the cruising distance when a flat land traveling according to this embodiment is assumed is indicated by a dotted line. If the cruising range is D, it is impossible to turn back at a point where the cruising range is half of that, that is, when D / 2 is assumed.
At this point, the determination according to the conventional technique is determined to be able to be turned back even if it is further advanced, but it is actually impossible.

As yet another determination method, the control unit 1d may calculate power necessary for returning the return path and issue a warning according to the remaining power.
That is,
Gradient resistance = (Actual power consumption-Electricity consumption assuming flat road driving) / Vehicle speed x Efficiency Calculate gradient resistance and use this to calculate power consumption [Wh] = ∫ {Electricity consumption when assuming flat ground driving + (-gradient resistance x vehicle speed / efficiency) dt
Then, the power consumption necessary for returning is calculated.
The point where the power consumption required to turn back> the remaining battery power becomes the point where it cannot be turned back.

  Therefore, when the cruising distance notification device 1 calculates a point that cannot be turned back by any of the above three points, the cruising distance notification device 1 approaches the point that cannot be turned back at least one of the display unit 1b and the speaker 1c before this point. Notification / warning.

FIG. 5 shows a running simulation result of the cruising distance notification device 1 for the electric vehicle of the first embodiment.
The horizontal axis of each stage indicates time [× 10 sec]. The vertical axis shows the mileage [Km] at the top, the altitude [m] at the second from the top, the gradient [deg] at the third from the top, and the power [Kwh] at the fourth from the top Represents the cruising range [Km] at the bottom.
In the power graph, the solid line represents the remaining power of the battery, the alternate long and short dash line represents the power required for turning back, and the broken line represents the power consumption when it is assumed that the vehicle is traveling on a flat ground.
Further, in the graph of cruising distance, the solid line indicates the cruising distance, and the broken line indicates the cruising distance when it is assumed that the vehicle travels on a flat ground.

The first to third tiers from the top are information on the travel path. The remaining power of the battery 2 due to traveling increases when the energy recovery on the downhill exceeds the power consumption for traveling, and decreases when the energy recovery is converse. The altitude decreases with a downward slope until the running time is 5,000 seconds, and then the altitude increases with an upward slope.
Therefore, as indicated by the solid line in the fourth stage from the top, the remaining power of the battery 2 does not decrease so much in the downward gradient, and greatly decreases from the traveling time of 6,000 seconds in which the upward gradient increases.

On the other hand, as shown by the alternate long and short dash line in the same stage, the power required for turning back is an uphill when turning back from a point where the running time is 5,000 seconds. growing.
The point where the solid line and the alternate long and short dash line intersect (indicated by a circle) is the limit point where it cannot be turned back. Therefore, it becomes impossible to turn back when proceeding beyond this. For example, the point A illustrated at the top of FIG. 5 can be returned to a predetermined point at a point A before the point where it cannot be turned back, but cannot be turned back at a point B beyond the point where it cannot be turned back. .
Therefore, on the display 1b or the speaker 1c, it is impossible to turn back to a predetermined point if you go further ahead (point C) before the point that cannot be turned back (for example, a point with a mileage of 31km) indicated by ○. Notification to the driver.
On the other hand, as shown by the solid line at the bottom stage, if the cruising distance is calculated only from the remaining power of the battery 2 as in the prior art, it will be possible to reciprocate about 50 km of the route, and the above It will deviate greatly from 31Km, and the battery 2 will run out of power.

Further, the power consumption and the cruising distance indicated by the broken lines in the fourth stage and the bottom stage from the top represent the power consumption and the cruising distance when calculated on the assumption that the vehicle travels on flat ground.
According to this, the virtual power consumption is 4.3 KWh and the cruising range is about 30 Km at a point where it cannot be turned back, and an appropriate value can be obtained.

As described above, in the cruising distance notification device for an electric vehicle according to the first embodiment, the following effects can be obtained.
In the non-returnable determination unit 1h, a point that cannot be returned is calculated and displayed in consideration of the regenerative energy on the hill on the forward path and the energy increase due to the gradient resistance on the return path on the same path. Since it is displayed on the device 1b and a warning sound is emitted from the speaker 1c, there is no worry that the driver will not be able to return to a predetermined point where charging is possible if he goes further.

  The non-returnable determination is performed by dividing the cruising distance calculated from the average power consumption by 2, and by calculating the remaining power of the battery 2 assuming that the vehicle is traveling on a flat ground. Judging when the amount is halved, it is necessary to integrate the power consumed by the gradient resistance of the forward path and the recovered accumulated power, and on the return path, the power whose sign is reversed with its absolute value is required in addition to running on flat ground Of the determinations that are made when the remaining battery power is equal to the calculated power required for the return path, one of the determinations is executed by the non-returnable determination unit 1h. It becomes possible to calculate a point that cannot be turned back.

  In addition, when the charge detection unit 1i detects charging of the battery 2 from the external charging facility, the point is stored in the predetermined point storage unit as a predetermined point, so that a point where charging can be reliably performed is automatically performed by returning. Will be updated.

  As described above, the present invention has been described based on the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and even when there is a design change or the like without departing from the gist of the present invention, it is included in the present invention.

1 Cruising range notification device
1a Input section
1b Display (notification means)
1c Speaker (notification means)
1d control unit
1e Predetermined point storage unit (predetermined point storage means)
1f Estimated required power calculator
1g Battery level detector (Battery level detector)
1h Non-returnable determination part (non-returnable determination means)
1i Charge detection unit (charge detection means)
2 Battery
3 Motor / generator (regenerative energy device)
4 Inverter (regenerative energy device)
5 Control unit
6 Navigation device

Claims (4)

In an electric vehicle equipped with a navigation device and a regenerative energy device capable of recovering to a battery by converting energy into electricity on a downhill,
Charging detection means for detecting that charging has been performed;
And a predetermined point storing means you store where it detects that charging by the charging detecting means as a predetermined point,
Battery remaining amount detecting means for detecting the remaining amount of power of the battery;
The absolute value of the recovered power recovered by gradient resistance during the outward to the current land point from the given point, the estimated level ground traveling required power estimated required level ground traveling at backward in the same way by changing the sign Comparing the estimated required power amount as the power required for the added return path and the remaining power amount at the current point detected by the remaining battery amount detecting means, or based on the remaining power amount of the battery at the predetermined point Te, and turned back impossible judging means for determining that no longer return to the predetermined point on the way back Proceeding to more earlier,
A notifying means for notifying information relating to non-returnability when the non-returnable determination means determines non-returnability;
A cruising distance notification device for an electric vehicle, comprising: In the electric vehicle cruising distance notification device according to claim 1,
The non-returnable determining means has an average power consumption calculating means for calculating an average power consumption from past driving data ,
A cruising distance is calculated based on the average power consumption calculated by the average power consumption calculating means and the remaining power at the predetermined point, and the point where the turnback is impossible is determined to be ½ of the cruising distance. is calculated as,
A cruising distance notification device for an electric vehicle. In the electric vehicle cruising distance notification device according to claim 1,
The non-returnable determining means includes virtual power consumption calculating means for calculating virtual power consumption when it is assumed that the electric vehicle is running on a flat ground.
A point where the virtual power consumption is half of the remaining power at the predetermined point is a point where it cannot be turned back.
A cruising distance notification device for an electric vehicle. In the electric vehicle cruising distance notification device according to claim 1,
The non-returnable determining means integrates the power consumption and accumulated power consumed by the gradient resistance in the forward path from the predetermined point to the current point , and estimates that it is necessary for flat ground traveling on the same road The estimated required power amount is calculated as the power required for the return path by adding the sign to the estimated flat ground required power , and the point when the remaining battery power is equal to the estimated required power amount is not returned. As a possible point,
A cruising distance notification device for an electric vehicle.

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