JP2021164236A - Calculation device of cruisable distance - Google Patents

Abstract

To provide a calculation device of a cruisable distance capable of suppressing variation of a cruisable distance of a moving body.SOLUTION: A calculation device of a cruisable distance includes: a motor 2 that is a power source of an electric vehicle 1; a battery 4 that supplies power to the motor 2; and a control unit 5 that obtains a first power consumption in a first predetermined period and a second power consumption in a second predetermined period shorter than the first predetermined period, obtains an average power consumption by adding the first power consumption and the second power consumption with a predetermined ratio, and calculates a cruisable distance on the basis of the average power consumption. When the second power consumption is equal to or greater than a threshold, the control unit 5 performs ratio adjustment control of increasing the ratio of the first power consumption with respect to the second power consumption in the average power consumption to calculate the cruisable distance.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cruising range calculation device.

Patent Document 1 describes the remaining capacity calculation means for calculating the remaining capacity of the battery mounted on the own vehicle and the electricity cost per unit running according to the amount of change in the remaining capacity of the battery calculated by the remaining capacity calculation means. The cruising range is calculated from the power cost calculation means that calculates a plurality for each different unit run, the remaining capacity of the battery calculated by the remaining capacity calculation means, and the power cost selected from the plurality of power costs calculated by the power cost calculation means. A cruising range calculation device including a cruising range calculation means for calculating is described.

Further, two or more electric costs are selected from the plurality of electric costs calculated by the electric cost calculation means, and each of the selected electric costs is weighted based on the remaining capacity of the battery calculated by the remaining capacity calculation means. It is disclosed that as the remaining capacity of the battery decreases, the weight of the electricity cost on the side where the unit travel becomes smaller increases.

International Publication No. 2014/054571

However, under circumstances where the electricity cost is improved, such as when the vehicle travels downhill, the cruising range increases due to the temporary improvement in the value of the electricity cost, but when the downhill travel is completed, the electricity cost increases. As it deteriorated and the cruising range decreased, there was a risk of giving the occupants a sense of discomfort.

Therefore, an object of the present invention is to provide a cruising distance calculation device capable of suppressing fluctuations in the cruising distance of a moving body.

In order to solve the above problems, the present invention is a first predetermined device for calculating the cruising distance of a moving body having an electric motor as a power source of the moving body and a power storage device for supplying electric power to the electric body. The first electric power cost in the period and the second electric power cost in the second predetermined period shorter than the first predetermined period are obtained, and the first electric power cost and the second electric power cost are added in a predetermined ratio to obtain the average electric power cost. A control unit that obtains and calculates the cruising distance based on the average power cost is provided, and the control unit determines the first power cost with respect to the second power cost in the average power cost when the second power cost is equal to or more than a threshold value. The ratio adjustment control for increasing the ratio is performed, and the cruising range is calculated.

As described above, according to the present invention, it is possible to suppress fluctuations in the cruising range of the moving body.

FIG. 1 is a configuration diagram of a main part of a cruising range calculation device according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a map for obtaining the ratio of the first power cost and the second power cost of the cruising range calculation device according to the embodiment of the present invention. FIG. 3 is a flowchart showing a procedure for calculating the cruising distance of the cruising distance calculating device according to the embodiment of the present invention. FIG. 4 is a time chart showing the cruising distance calculation timing when the second electricity cost by the cruising distance calculation process of the cruising distance calculating device according to the embodiment of the present invention is less than the threshold value. FIG. 5 is a time chart showing the cruising distance calculation timing when the second electricity cost by the cruising distance calculation process of the cruising distance calculating device according to the embodiment of the present invention is equal to or more than the threshold value.

The cruising range calculation device according to the embodiment of the present invention is a cruising range calculation device for a moving body having an electric motor as a power source of the moving body and a power storage device for supplying electric power to the electric motor. Then, the first electric power cost in the first predetermined period and the second electric power cost in the second predetermined period shorter than the first predetermined period are obtained, and the first electric power cost and the second electric power cost are added in a predetermined ratio. It is equipped with a control unit that calculates the average power cost and calculates the cruising distance based on the average power cost, and the control unit increases the ratio of the first power cost to the second power cost in the average power cost when the second power cost is equal to or higher than the threshold value. It is configured to perform ratio adjustment control to calculate the cruising range.

As a result, the cruising range calculation device according to the embodiment of the present invention can suppress fluctuations in the cruising range of the moving body.

Hereinafter, the cruising range calculation device according to the embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, an electric vehicle 1 as a moving body (hereinafter, also simply referred to as a “vehicle”) equipped with a cruising distance calculation device according to an embodiment of the present invention includes a motor 2 as an electric motor and an inverter 3. A battery 4 as a power storage device and a control unit 5 are included.

The motor 2 includes, for example, a synchronous motor including a rotor in which a plurality of permanent magnets are embedded and a stator in which a stator coil is wound. In the motor 2, a rotating magnetic field is formed in the stator by applying three-phase AC power to the stator coil, and the rotor rotates by the rotating magnetic field to generate a driving force.

Further, the motor 2 is driven so as to utilize the rotational resistance at the time of power generation for braking the vehicle 1. As a result, the motor 2 has a function of being able to generate electricity by regeneration. In this way, the motor 2 also functions as a generator and can generate electric power for charging the battery 4.

The rotating shaft of the motor 2 is connected to the drive shaft 11 via a speed reducer 21. The motor 2 drives the drive wheels 10 via the drive shaft 11.

The motor 2 is provided with a rotation speed sensor 91 that detects the rotation speed of the rotation shaft of the motor 2. The drive wheels 10 are provided with a wheel speed sensor 96 that detects the rotational speed of the drive wheels 10. The rotation speed sensor 91 and the wheel speed sensor 96 output the rotation in the rotation direction when the vehicle 1 moves forward as a positive rotation speed.

The inverter 3 supplies the three-phase AC power to the motor 2 under the control of the control unit 5. Further, the inverter 3 converts the three-phase AC power generated by the motor 2 into DC power to charge the battery 4.

The battery 4 is composed of, for example, a nickel storage battery, a lithium storage battery, or the like, and is configured by connecting a plurality of cells in series. The battery 4 supplies electric power to the motor 2 via the inverter 3. A current sensor 92 that detects the direct current of the inverter 3 is provided between the inverter 3 and the battery 4. The current sensor 92 outputs the current in the direction in which the battery 4 is discharged (direction from the battery 4 to the inverter 3) as a positive current value.

The cell voltage and temperature of each cell of the battery 4 can be detected by the control unit 5, and the control unit 5 uses these detected values and the output of the current sensor 92 to detect the state of charge (SOC) of the battery 4. Charge) can be detected.

The control unit 5 is composed of a computer unit including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input port, and an output port.

The ROM of the control unit 5 stores various control constants, various maps, and the like, as well as a program for causing the computer unit to function as the control unit 5. That is, when the CPU executes the program stored in the ROM, the computer unit functions as the control unit 5.

The input port of the control unit 5 includes various sensors including the above-mentioned rotation speed sensor 91, current sensor 92, wheel speed sensor 96, shift position sensor 93, accelerator opening sensor 94, and brake switch 95. Kind is connected. On the other hand, various control objects including the above-mentioned inverter 3 are connected to the output port of the control unit 5.

The shift position sensor 93 detects a shift position selected by the driver's operation of a shift lever (not shown). The shift positions are, for example, a forward traveling range (D range), a motor speed limiting range (L range) that increases the braking force of the motor 2 when the vehicle 1 descends from the D range, a reverse traveling range (R range), and a neutral position. Either the (neutral) range (N range) or the parking range (P range) is selected. The D range and the L range are shift positions in the forward direction of the vehicle 1, and the R range is a shift position in the reverse direction of the vehicle 1.

The accelerator opening sensor 94 detects the accelerator opening, which is the amount of depression of the accelerator pedal (not shown) operated by the driver.

The brake switch 95 detects whether or not a brake pedal (not shown) is depressed by the driver.

In this embodiment, the control unit 5 calculates the average electricity cost in a plurality of predetermined periods at predetermined time intervals. The predetermined period is, for example, a predetermined mileage or a predetermined mileage.

For example, the control unit 5 calculates the average electric cost in the first mileage as the first electric cost, and calculates the average electric cost in the second mileage shorter than the first mileage as the second electric cost.

The control unit 5 weights the first power cost and the second power cost according to the SOC of the battery 4, and calculates the average power cost.

For example, the control unit 5 obtains the ratio α (0 ≦ α ≦ 1) of the first power cost according to the SOC of the battery 4, and calculates the average power cost by the following formula (1).
Average electricity cost = 1st electricity cost x α + 2nd electricity cost x (1-α) ... (1)

The control unit 5 obtains α by, for example, a map as shown in FIG. In FIG. 2, the power consumption coefficient ratio shown on the vertical axis on the straight line corresponding to the SOC of the battery 4 is defined as α.

The control unit 5 calculates the cruising distance from the calculated average electricity cost. The control unit 5 calculates the cruising range by, for example, the following equation (2).
Cruising distance [km] = average electricity cost [km / kWh] x battery power [kWh] ... (2)

Here, the battery power is calculated by multiplying, for example, the fully charged capacity of the battery 4 when it is new by SOH (State Of Health) and SOC.

The control unit 5 displays the calculated cruising distance on a display unit including, for example, a liquid crystal display device (not shown).

When the second power cost is equal to or higher than a predetermined threshold value, the control unit 5 performs ratio adjustment control for correcting the ratio of the first power cost and the second power cost so as to reduce the ratio of the second power cost to the average power cost.

For example, when the second electricity cost is equal to or higher than a predetermined threshold value, the control unit 5 sets the value obtained by multiplying α obtained from the map by 1.5 as the corrected α, or adds 0.1 to α obtained from the map. Is the corrected α.

By doing so, even in a case where the motor 2 continues to regenerate on a long downhill and the second electricity cost increases, it is possible to prevent the cruising range from becoming excessive.

The control unit 5 has an accelerator off state (accelerator opening degree) such as a state in which the instantaneous power cost is a negative value even if the second power cost is less than a predetermined threshold value, for example, an inertial running state without regeneration or a regenerative running state. When the state in which the power is not supplied from the battery 4 to the motor 2 continues for a predetermined period or longer in the zero state), the ratio adjustment control is performed. Here, the predetermined period is, for example, a predetermined mileage or a predetermined mileage.

By doing so, even if the second electric cost is not too large, if the vehicle is running while regenerating for a certain period of time, the ratio of the first electric cost when calculating the average electric cost in advance Can be increased to reduce the effect of the second electricity cost.

As a result, for example, in the case where the downhill continues for a long time, the cruising distance continues to increase without the second electricity cost exceeding the threshold value, and then the cruising distance suddenly increases when the second electricity cost exceeds the threshold value. It can be prevented from becoming smaller.

That is, at the moment when the second electricity cost crosses the threshold value in the state where the regenerative state continues for a long period of time, it is possible to suppress that the cruising range is displayed short even though the regenerative state has not changed.

The control unit 5 stops updating the second electricity cost for a predetermined period of time after the instantaneous electricity cost becomes a negative value.

By doing so, it is possible to suppress an increase in the cruising distance from the start of regeneration of the motor 2 to the elapse of the predetermined period, so that the cruising distance increases until the elapse of the predetermined period, and the predetermined period elapses. At that point, the ratio adjustment control can prevent the cruising range from decreasing.

The cruising range calculation process by the cruising range calculating device according to the present embodiment configured as described above will be described with reference to FIG. The cruising distance calculation process described below is started when the control unit 5 starts operation, and is executed at time intervals of preset cruising distance calculation timings.

In step S1, the control unit 5 determines whether or not the second electricity cost is equal to or greater than the threshold value. If it is determined that the second electricity cost is equal to or higher than the threshold value, the control unit 5 executes the process of step S2. If it is determined that the second electricity cost is not equal to or higher than the threshold value, the control unit 5 executes the process of step S3.

In step S2, the control unit 5 performs the ratio adjustment control described above to calculate the cruising range and display it on the display unit. After executing the process of step S2, the control unit 5 ends the cruising range calculation process.

In step S3, the control unit 5 determines whether or not the accelerator is off. If it is determined that the accelerator is off, the control unit 5 executes the process of step S4. If it is determined that the accelerator is not in the off state, the control unit 5 executes the process of step S8.

In step S4, the control unit 5 stops updating the second electricity cost. After executing the process of step S4, the control unit 5 executes the process of step S5.

In step S5, the control unit 5 determines whether or not the accelerator-off state has continued for a predetermined period. When it is determined that the accelerator off state has continued for a predetermined period, the control unit 5 executes the process of step S2. When it is determined that the accelerator off state has not continued for a predetermined period, the control unit 5 executes the process of step S6.

In step S6, the control unit 5 stops continuous monitoring of the accelerator off state. After executing the process of step S6, the control unit 5 executes the process of step S7.

In step S7, the control unit 5 resumes updating the second electricity cost. After executing the process of step S7, the control unit 5 executes the process of step S8.

In step S8, the control unit 5 calculates the cruising distance by normal control and displays it on the display unit. After executing the process of step S8, the control unit 5 ends the cruising range calculation process.

The operation by such a cruising range calculation process will be described with reference to FIGS. 4 and 5.

As shown in FIG. 4, since the second electric cost is smaller than the threshold value at the time t1 of the cruising distance calculation timing, the average electric cost is calculated at a normal ratio, and the cruising distance is calculated and displayed based on this average electric cost. Further, since the accelerator is off, the renewal of the second electricity cost is stopped, and monitoring of whether the accelerator off state continues for a predetermined period is started.

At time t2 when the accelerator off state continues for a predetermined period, the ratio adjustment control is turned on, and at time t3, the average electricity cost is calculated by the ratio adjustment control, and the cruising distance is calculated and displayed by this average electricity cost, and the ratio adjustment is performed. Control is turned off. The cruising range may be calculated at time t2.

In this way, when the second electricity cost is smaller than the threshold value and the accelerator is off, the cruising range is calculated and displayed by the ratio adjustment control when the accelerator off state continues for a predetermined period. Therefore, it is possible to suppress fluctuations in the cruising range.

The cruising distance may be calculated and displayed only at time t3 without calculating and displaying the cruising distance at time t1. By doing so, it is possible to suppress fluctuations in the cruising range.

As shown in FIG. 5, when the accelerator is off at time t11, the second electricity cost increases.

Since the second power cost is equal to or higher than the threshold value at the time t12 of the cruising distance calculation timing, the ratio adjustment control is turned on, and the average power cost is calculated by the ratio adjustment control at the time t13, and the cruising distance is calculated by this average power cost. Is calculated and displayed, and the ratio adjustment control is turned off.

In this way, when the second power cost is equal to or higher than the threshold value, the average power cost is calculated by the ratio adjustment control, and the cruising distance is calculated and displayed based on this average power cost. Therefore, it is possible to suppress fluctuations in the cruising range.

As described above, in this embodiment, the control unit 5 performs ratio adjustment control to increase the ratio of the first electric cost to the average electric cost when the second electric cost is equal to or more than the threshold value, and calculates the cruising distance.

As a result, when the second power cost exceeds the threshold value, the ratio of the first power cost to the second power cost in the average power cost for calculating the cruising distance is increased, and the cruising distance is increased due to the influence of the increase in the second power cost. It is possible to prevent it from becoming excessive.

Further, the control unit 5 calculates the average power cost by the ratio adjustment control when the second power cost is less than the threshold value and the state in which the power is not supplied from the battery 4 in the accelerator off state to the motor 2 continues for a predetermined period. Then, the cruising range is calculated from this average electricity cost.

Even if the second power cost is less than the threshold value and not too large, in a regenerative state where the second power cost increases, the ratio of the first power cost to the second power cost in the average power cost for obtaining the cruising distance To increase.

As a result, for example, while the vehicle 1 is coasting or traveling in a regenerative state, the second electricity cost becomes equal to or higher than the threshold value, the ratio adjustment control is performed, the cruising range is shortened, and the occupant feels uncomfortable. It can be suppressed.

Further, the control unit 5 stops updating the second electric power cost if the power is not supplied from the battery 4 to the motor 2 when the second electric power cost is less than the threshold value.

As a result, if the second power cost is less than the threshold value and the vehicle 1 is in a state where the power is not supplied from the battery 4 to the motor 2, the renewal of the second power cost is stopped until a predetermined period elapses. .. Therefore, it is possible to prevent the cruising distance from increasing by the lapse of a predetermined period and decreasing the cruising distance after the lapse of a predetermined period, and to suppress fluctuations in the cruising distance.

In this embodiment, the case of an electric vehicle is shown, but the present invention is not limited to this, and the case is also limited to a moving body in which the drive wheels are driven by an electric motor using the electric power of the power storage device, for example, a plug-in hybrid vehicle. Applicable.

In this embodiment, an example in which the control unit 5 performs various determinations and calculations based on various sensor information has been described, but the present invention is not limited to this, and the electric vehicle 1 is provided with a communication unit capable of communicating with an external device such as an external server. , Various judgments and calculations are performed by the external device based on the detection information of various sensors transmitted from the communication unit, the judgment results and calculation results are received by the communication unit, and the received judgment results and calculation results are received. It may be used to perform various controls.

Although the embodiments of the present invention have been disclosed, it is clear that some skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 Electric vehicle (moving body)
2 Motor (motor)
4 Battery (power storage device)
5 Control unit 94 Accelerator opening sensor

Claims (3)

A device for calculating the cruising distance of a mobile body having an electric motor that is a power source of the mobile body and a power storage device that supplies electric power to the electric device.
The first electric cost in the first predetermined period and the second electric cost in the second predetermined period shorter than the first predetermined period are obtained, and the first electric cost and the second electric cost are added in a predetermined ratio. It is equipped with a control unit that calculates the average electricity cost and calculates the cruising range based on the average electricity cost.
When the second power cost is equal to or higher than the threshold value, the control unit performs ratio adjustment control for increasing the ratio of the first power cost to the second power cost in the average power cost, and can calculate the cruising distance. Distance calculation device. The control unit performs the ratio adjustment control when the second electric power cost is less than the threshold value and the state in which the electric power is not supplied from the power storage device to the electric motor continues for a predetermined period, and the cruising is possible. The cruising range calculation device according to claim 1, wherein the distance is calculated. 2. The control unit stops updating the second electric power cost when it detects that the power storage device does not supply power to the electric motor when the second electric power cost is less than the threshold value. The cruising range calculation device described in.

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