JPH06233404A - Battery-powered traveling vehicle - Google Patents

Abstract

PURPOSE:To display optimum drive information for arriving at a destination by specifying and displaying a speed, power consumption to become a crossing point of a characteristic formula including a traveling environment as a parameter and a characteristic formula including a distance to the destination and a battery amount to be used to the destination as parameters. CONSTITUTION:First deciding means 15 decides a mathematical formula form of a first characteristic formula for relating corresponding relationship between a speed to be taken by a battery-powered traveling vehicle 1 and power consumption in a present traveling environment. On the other hand, second deciding means 16 decides a mathematical formula form of a second characteristic formula for relating corresponding relationship between a speed of the vehicle 1 which can travel with a battery amount to be used to a destination at a distance to the destination and power consumption. Specifying means 17 specifies both or either one of optimum speed and optimum power consumption to be taken by the vehicle 1 from the two characteristic formulae decided by the means 15, 16. Then, display control means 18 displays the optimum speed, the optimum power consumption specified by the means 17 on display means 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-equipped traveling body that travels using a battery as a drive source, and more particularly to a battery-equipped traveling body having a function of displaying optimum driving information for reaching a destination.

A vehicle equipped with a battery travels using a battery as a drive source, and when the battery runs out, the vehicle cannot travel. From now on, it is convenient for the vehicle equipped with a battery to be provided with a mechanism for instructing the driver how to drive so that the vehicle can reach the destination without running out of battery.

[0003]

2. Description of the Related Art In a conventional vehicle equipped with a battery, a battery remaining amount and a battery consumption amount are displayed to a driver to prevent the battery from running out.

In addition, in a battery-equipped traveling body equipped with a solar battery for battery assistance, in addition to this, the amount of power generated by the solar battery is displayed to the driver to prevent the battery from running out. Was taken.

That is, conventionally, the driver himself / herself determined the operating speed at which the battery does not run out from these displayed values, so that the driver can reach the destination without running out of the battery.

[0006]

However, the battery consumption of the battery-equipped traveling body changes greatly in accordance with the road surface condition during operation, etc., and the amount of power generated by the solar cell provided in the battery-equipped traveling body also changes. Since it changes greatly depending on the weather while driving,
According to such a conventional technique, there is a problem in that it is not possible to accurately determine the operating speed at which the vehicle can reach the destination without running out of battery. There was also the problem of imposing a mental burden on the driver.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a new battery-equipped vehicle having a function of displaying optimal driving information for reaching a destination.

[0008]

FIG. 1 shows the principle configuration of the present invention. In the figure, reference numeral 1 is a battery-equipped traveling body equipped with the present invention.

The battery-equipped traveling body 1 includes a battery 1
0, the motor 11, the speed detecting means 12, the power consumption detecting means 13, the battery remaining amount detecting means 14, the first determining means 15, the second determining means 16, and the specifying means 17.
And a display control means 18 and a display means 19.

The battery 10 serves as a drive source for the battery-equipped traveling body 1. The motor 11 receives power supply from the battery 10 and drives the battery-equipped traveling body 1. The speed detecting means 12 detects the speed of the battery-equipped traveling body 1 from the number of rotations of the motor 11, for example. Power consumption detection means 1
3 detects the power consumption of the battery-equipped traveling body 1 from the battery output current and the battery output voltage, for example. The battery remaining amount detecting means 14 detects the battery remaining amount by, for example, integrating the power consumption detected by the power consumption detecting means 13.

The first determining means 15 determines a mathematical form of a first characteristic equation relating the correspondence relationship between the speed that the battery-equipped vehicle 1 can take and the power consumption under the current traveling environment. The second determining means 16 is a second characteristic expression that relates the correspondence relationship between the speed and the power consumption of the battery-equipped traveling body 1 that allows the distance to the destination to travel with the amount of battery available to the destination. Determine the mathematical form.

The specifying means 17 uses the first characteristic equation determined by the first determining means 15 and the second characteristic equation determined by the second determining means 16 to determine the optimum speed that the battery-equipped traveling body 1 should take. And / or optimum power consumption. The display control means 18 controls the display of the optimum speed / optimum power consumption specified by the specifying means 17, and displays the optimum speed / optimum power consumption in association with the actual measurement value in this display. It may be controlled to keep going. The display means 19 displays the optimum speed / optimum power consumption specified by the specifying means 17.

[0013]

In the present invention, the first determining means 15 has the power consumption of the battery-equipped traveling body 1 as P, the speed as V, the vehicle weight as M, the air resistance coefficient as Cd, the front shadow projection area as A, and the system efficiency. Is represented by E, and the rolling coefficient in consideration of the road surface slope is represented by R, the following first relation that correlates the possible relationship between the speed and the power consumption of the battery-equipped traveling body 1 under the current traveling environment is given. Characteristic expression of

[0014]

[Equation 1]

By substituting the power consumption P ₀ detected by the power consumption detecting means 13 at the current traveling time and the speed V ₀ detected at the current traveling time by the speed detecting means 12,

[0016]

[Equation 2]

According to the above, the rolling coefficient R ₀ at the present running time
According to the detected rolling coefficient R ₀ ,

[0018]

[Equation 3]

The formula form of the first characteristic formula in the current driving environment is determined. The first characteristic expression determined by the first determining means 15 represents the correspondence relationship between the speed and the power consumption that the battery-equipped traveling body 1 can take under the current traveling environment.

On the other hand, the second determining means 16 sets the power consumption of the battery-equipped traveling body 1 to P, the power generation amount of the power generator of the battery-equipped traveling body S to S, the battery amount usable to the destination to B, and the purpose. If the arrival time to the ground is represented by T and the distance to the destination is represented by L, then the relational expression of (P−S) × T = B and the relational expression of V × T = L are satisfied. The following second characteristic formula derived

[0021]

[Equation 4]

By substituting the battery amount B that can be used to the destination and the distance L to the destination, which is determined by the battery remaining amount detected by the battery remaining amount detecting means 14, into The mathematical form of the second characteristic formula is determined.

The second characteristic equation determined by the second determining means 16 is a battery-equipped traveling at the present traveling time which enables traveling with a battery amount B usable up to the destination for the distance L to the destination. The correspondence between the speed of the body 1 and the power consumption is shown. When the battery-equipped traveling body 1 does not include the power generator, the mathematical form of the second characteristic equation is as follows.

[0024]

[Equation 5]

Will be determined according to When the first determining means 15 determines the mathematical form of the first characteristic expression and the second determining means 16 determines the mathematical form of the second characteristic expression, the identifying means 17 determines the two The speed / power consumption that is the intersection of the characteristic expressions is specified. The speed thus specified indicates the optimum speed of the battery-equipped traveling body 1 at the current traveling time, and the power consumption thus specified is the battery at the current traveling time. The optimum power consumption of the traveling vehicle 1 is displayed.

Then, the display control means 18 causes the display means 19 to display the optimum speed / optimum power consumption specified by the specifying means 17 in association with, for example, an actual measured value, thereby displaying to the driver. Then, the optimum speed / optimum power consumption for reaching the destination is notified.

As described above, according to the present invention, the problems of the prior art can be solved.

[0028]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 2 illustrates a device configuration of an electric vehicle equipped with the present invention.

In the figure, 20 is an electric vehicle, 21 is a battery, 22 is a motor, 23 is a tire, 24 is a motor controller, 25 is a pulse sensor for generating pulses according to the traveling speed of the electric vehicle 20, and 26 is a battery 21. Is a current sensor that measures the output current of the electric vehicle, 27 is a voltage sensor that measures the output voltage of the battery 21, and 28 is an optimum driving information calculation device that calculates the optimum speed / power consumption of the electric vehicle 20.

As shown in FIG. 3, the optimum driving information calculating device 28 is composed of an adapter section 30 and a main body section 40. The adapter unit 30 includes a pulse counter 31 for counting the pulses output by the pulse sensor 25.
Interface control between the analog multiplexer 32 for selecting the measurement value of the current sensor 26 / voltage sensor 27, the A / D converter 33 for A / D converting the measurement value selected by the analog multiplexer 32, and the main body 40. And an interface control unit 34 that controls

On the other hand, the main body portion 40 includes the adapter portion 30.
An interface control unit 41 that controls the interface with the external storage unit 42 including an IC memory card and the like.
A timer unit 43 for generating a timer clock signal, a main storage unit 44 for storing a calculation program for optimum driving information loaded from the external storage unit 42, and an optimum driving information calculation program for storing in the main storage unit 44. A CPU unit 45 that calculates optimum driving information by executing it, a display control unit 46 that controls the display control processing of the optimum driving information calculated by the CPU unit 45, and a display unit that displays the optimum driving information calculated by the CPU unit 45. And 47.

The optimum driving information calculation program stored in the main storage unit 44 executes a process of calculating and displaying the speed / power consumption of the electric vehicle 20 which is optimum for reaching the destination.

FIG. 4 shows an embodiment of the processing flow of this optimum driving information calculation program to be executed by the CPU section 45. Next, according to this processing flow, the optimum driving information calculation processing executed by the optimum driving information calculation device 28 will be described in detail.

When the electric vehicle 20 starts to run, the CPU section 45 of the optimum driving information calculation device 28 enters into the execution of the optimum driving information calculation program, and as shown in the processing flow of FIG. In step 1, the timer unit 43 is activated, and in the subsequent step 2, the timer clock signal generated by the timer unit 43 is timed to determine whether or not the specified measurement interval time has elapsed since the last measurement. To go.

When it is determined in step 2 that the specified measurement interval time has elapsed since the last measurement, the process proceeds to step 3 where the pulse sensor 25 / current sensor 26 / voltage sensor 2
7 is sampled, and in the following step 4, the remaining battery amount is calculated using the collected sensor information, and the battery amount B usable up to the destination is calculated according to the definition of 90% of the remaining battery amount. To do. As a method of calculating the remaining battery level used here, a conventionally known method can be used, but a new method of calculating the remaining battery level devised by the present inventor will be described later.

Then, in step 5, the pulse sensor 25
The remaining distance L to the destination is calculated according to the traveled distance specified from the integrated value of the pulses generated by. continue,
In step 6, first, the product value of the battery output current detected by the current sensor 26 and the battery output voltage detected by the voltage sensor 27 is calculated to calculate the power consumption P ₀ at the current traveling time. From the pulse generated by the pulse sensor 25, the speed V ₀ at the present traveling time is calculated.
Then, next, by substituting these values and the known vehicle weight M / air resistance coefficient Cd / projected shadow projection area A / system efficiency E into the mathematical expression of the above [Formula 2], the present running By detecting the rolling coefficient R ₀ at the time point and substituting the detected rolling coefficient R ₀ into the mathematical expression of the above [Formula 3],
The form of the mathematical expression of the above-mentioned first characteristic expression in the current traveling environment is determined. The first characteristic expression determined in this way is
It shows the correspondence between the possible speed of the electric vehicle 20 and the power consumption under the current traveling environment.

Then, in step 7, the battery amount B that can be used up to the destination calculated in step 4 and the distance L to the destination calculated in step 5 are substituted into the above equation (5). As a result, the mathematical expression form of the above-mentioned second characteristic expression at the time of the current traveling is determined. The second characteristic expression determined in this manner is a relationship between the speed and the power consumption of the electric vehicle 20 at the current traveling time when the distance L to the destination can be traveled with the battery amount B that can be used up to the destination. It represents the correspondence.

Then, in step 8, the speed / power consumption which is the intersection of the first characteristic equation determined in step 6 and the second characteristic equation determined in step 7 is calculated. calculate. That is, as shown in FIG.
It solves the simultaneous equations of two characteristic expressions. The speed specified in this way indicates the optimum speed that the electric vehicle 20 should take at the current running time, and the power consumption specified in this way shows the electric vehicle 20 at the current running time. The optimum power consumption to be taken is displayed.

Then, in the following step 9, the optimum speed / optimum power consumption specified in step 8 is displayed on the display unit 47, so that the driver can find the optimum speed / optimum power consumption for reaching the destination. After the power is notified, the process returns to step 2 to continue the calculation / display process of the optimum speed / optimum power consumption. In order to make it easy for the driver to understand, the display process of the optimum speed / optimum power consumption is preferably displayed according to a mode in which the measured value at the current traveling time is compared, for example, as shown in FIG.

In this way, the optimum driving information calculation device 2
8 is an electric vehicle 2 that is optimal for reaching the destination
By calculating and displaying the speed / power consumption of 0, the driver is instructed on the driving method that enables the driver to reach the destination without running out of the battery.

Next, a new battery remaining amount calculation method devised by the present inventor will be described. According to this calculation method, the remaining battery level required in the process of step 4 can be obtained easily and with high accuracy.

In the new battery remaining amount calculation method devised by the present inventor, the correspondence between the battery remaining amount and the battery voltage, which is shown when the battery 21 is discharged at the specified reference current, is calculated as follows. And the applied voltage are managed as correspondence relationship data, and the remaining battery level is detected using this correspondence relationship data.
As the reference current for collecting this correspondence data, the battery 2 in the average running state of the electric vehicle 20 is used.
It is preferable to use an output current of 1, for example, an output current of 3.5 A of the battery 21 when the electric vehicle 20 travels on a flat road at a speed of 40 to 50 km / h.

FIG. 7 shows the discharge characteristic of the battery 21 when 3.5 A is adopted as the reference current. Here, the horizontal axis represents the discharge time, and the vertical axis represents the discharge voltage (which is the applied voltage).

As shown in FIG. 7, the battery 21 is
When it discharges at 3.5 A, it starts to discharge from 14.2 V in a fully charged state and shows a discharge characteristic that sharply drops at 11.0 V. Remaining battery capacity S (v) when the discharge voltage is v
Is defined as "the amount of electric power that can be taken out in the future when electric power is taken out from the battery 11 with an output current of 3.5 A", and further, the remaining battery amount at 11.0 V is defined as 0%. Then, the remaining battery level S (v) when the discharge voltage is v is

[0045]

[Equation 6]

Will be represented by Here, T ₀ represents the discharge time until the discharge voltage reaches 11.0 V, and T represents the discharge time until the discharge voltage reaches v. The dimension of the battery remaining amount S (v) in this equation is%, and conversion to electric power is realized by multiplying the electric power amount of the battery 21 held at the time of full charge.

The battery remaining amount S (v) thus obtained
On the other hand, a plot of the discharge voltage v at that time is the correspondence data between the remaining battery level and the applied voltage. FIG. 8 illustrates correspondence data obtained from the discharge characteristics of the battery 21 shown in FIG.

CPU section 45 of the optimum driving information calculation device 28
When the processing of step 4 of the processing flow of FIG. 4 is entered, the correspondence remaining data is used to calculate the remaining battery level by executing the processing flow shown in FIG.

That is, first, in step 1, by referring to the correspondence data stored in the main storage unit 44, the applied voltage associated with the remaining battery amount (%) obtained in the previous measurement is specified. To do. Here, when the electric vehicle 20 starts traveling from the fully charged state of the battery 21, 100% is used as the initial value of the battery remaining amount, and when the electric vehicle 20 starts traveling from the charged state during use. As the initial value of the battery remaining amount, the battery remaining amount (%) at the end of the previous travel is used.

When the applied voltage is specified in step 1, then, in step 2, the specified applied voltage and the battery output current collected in step 3 of the processing flow of FIG.
The battery consumption amount between the previous measurement time and the current measurement time is calculated by calculating three multiplication values with the set specified measurement interval time.

Then, in step 3, the battery remaining amount (%) obtained in the previous measurement is multiplied by the full charge power amount of the battery 21 to obtain the battery remaining amount in the previous measurement by the power amount. By subtracting the battery consumption amount calculated in step 2 from the obtained battery remaining amount, the battery remaining amount (expressed in electric energy) at the time of this measurement is calculated.
According to the remaining battery amount thus calculated, the amount B of the battery that can be used up to the destination is determined in step 4 of the processing flow of FIG. At this time, the obtained remaining battery amount is converted into a percentage display for the next measurement of the remaining battery amount.

In this way, the battery remaining amount calculation method newly devised by the present inventor realizes that the battery remaining amount of the battery 21 is calculated only by measuring the battery output current. Of.

The present inventor has confirmed through experiments that the remaining battery level detected in this way can be detected with a higher degree of accuracy than that detected by the conventional remaining battery level detection method. It was This is for the following reason.

That is, when the output current of the battery 21 is larger than the reference current, the original battery voltage shows a smaller value than when the correspondence data was obtained. By calculating the battery consumption amount using the applied voltage showing a value larger than the voltage, the battery consumption amount is automatically evaluated to be relatively large, and when the output current of the battery 21 is smaller than the reference current. , The original battery voltage shows a larger value than when the correspondence data was obtained,
Even at this time, by calculating the battery consumption amount using the applied voltage showing a value smaller than the original battery voltage, the battery consumption amount is automatically evaluated to be small.

Therefore, when the output current of the battery 21 is larger than the reference current, the battery consumption amount is larger than the evaluation at the reference current due to the large heat loss and the like. Is automatically absorbed in a larger amount, and when the output current of the battery 21 is smaller than the reference current, the heat loss is smaller and the Also consumes a small amount of battery consumption, but by automatically evaluating the battery consumption to a small amount according to the applied voltage, it is processed so as to absorb it automatically, so the battery remaining amount is highly accurate. It will be possible to detect it.

The present invention for realizing the display of the optimum driving information is
It is also applicable to solar cars. FIG. 10 illustrates a device configuration of a solar car including the optimum driving information calculation device 28 of the present invention. In the figure, the same components as those described in FIG. 2 are denoted by the same symbols. Reference numeral 50 is a solar car, 51 is a solar cell included in the solar car 50, which generates electric power and supplies it to the battery 21 / motor controller 24, 52 is a current sensor, which detects an inflow current to the motor controller 24. Things, 53
Is a current sensor for detecting the generated current of the solar cell 51. Here, in this configuration, the ammeter 2
6 is, when the battery 21 is charged,
It will operate to measure the battery charge current.

That is, since the solar car 50 has a structure in which electric power is supplied to the motor controller 24 by the solar cell 51, when the solar car 50 is applied to the solar car 50, the optimum operation information calculating device 28 newly uses the current sensor 5
Taking the configuration including the 2 / current sensor 53, in step 6 of the processing flow of FIG. 4, the current flowing into the motor controller 24 detected by the current sensor 52 and the voltage sensor 27 are detected.
The power consumption P ₀ is calculated by calculating the multiplication value with the battery output voltage detected by, and the formula form of the first characteristic formula is determined. Then, step 7 in the processing flow of FIG.
Then, the power generation amount S of the mathematical expression of [Equation 4] is calculated by calculating the multiplication value of the power generation current of the solar cell 51 detected by the current sensor 53 and the battery output voltage detected by the voltage sensor 27. By substituting the power generation amount S, the battery amount B that can be used up to the destination, and the distance L to the destination into the formula of [Equation 4], the formula form of the second characteristic formula is determined. Of.

In the solar car 50, the battery 2
Since 1 is charged by the solar cell 51, when the battery remaining amount is calculated in step 4 of the processing flow of FIG. 4, the charging current to the battery 21 detected by the current sensor 26 and the voltage sensor 27. Evaluate the battery charge amount (taking into consideration the charging efficiency) that flows in between the previous and current battery residual amount measurements from the battery voltage detected by By correcting the battery consumption during the measurement of, the accurate remaining battery amount is detected.

[0059]

As described above, according to the present invention,
It is possible to display optimum driving information for reaching a destination in a battery-equipped traveling object that travels using a battery as a driving power source. As a result, the driver can reach the destination without worrying about running out of battery by driving according to the instruction of the optimum driving information.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a device configuration diagram of an electric vehicle including the present invention.

FIG. 3 is a system configuration diagram of an optimum driving information calculation device.

FIG. 4 is an example of a processing flow of an optimum driving information calculation program.

FIG. 5 is an explanatory diagram of an optimum speed / optimum power consumption calculation process.

FIG. 6 is an example of a method of displaying an optimum speed.

FIG. 7 is an explanatory diagram of discharge characteristics of a battery.

FIG. 8 is an example of correspondence data.

FIG. 9 is a processing flow of a battery remaining amount calculation processing.

FIG. 10 is a device configuration diagram of a solar car including the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery-carrying vehicle 10 Battery 11 Motor 12 Speed detection means 13 Power consumption detection means 14 Battery residual quantity detection means 15 First determination means 16 Second determination means 17 Identification means 18 Display control means 19 Display means

Claims (3)

[Claims] 1. A battery-equipped vehicle having a function of displaying optimal driving information, including a traveling environment as a parameter, and a correspondence between a speed and a power consumption of the battery-equipped vehicle under the traveling environment. By substituting the detected values of the speed and the power consumption of the battery-equipped traveling body into the first characteristic equation that relates the relationship, the traveling environment at the present time is determined, and thus the first characteristic under the current traveling environment is obtained. A first determining means (15) for determining the mathematical form of the equation, and a battery including the distance to the destination and the battery amount usable to the destination as parameters, and enabling the travel with the battery amount. By substituting the distance to the destination and the amount of battery usable up to the destination into the second characteristic expression that relates the correspondence between the speed of the mounted traveling body and the power consumption, the second characteristic at the present time is obtained. Determine the mathematical form of the formula 2nd determining means (16), the first characteristic equation determined by the first determining means (15), and the second characteristic equation determined by the second determining means (16). By specifying the specifying means (17) for specifying both or one of the optimum speed and the optimum power consumption to be taken by the battery-equipped traveling body, and the battery-equipped traveling body specified by the specifying means (17). Means for displaying the optimum speed and / or the optimum power consumption of
A battery-equipped vehicle, comprising: a display control means (18) for displaying at (19). 2. The battery-equipped traveling body according to claim 1, wherein, when the battery-equipped traveling body has a power generator, the second determining means (16) has a second characteristic according to the amount of power generated by the power generator. A battery-equipped vehicle characterized by being processed so as to correct the mathematical form of the formula. 3. The battery-equipped traveling body according to claim 1 or 2, wherein the display control means (18) performs processing for displaying the optimum value in association with the actual measured value. A vehicle equipped with a battery, which is characterized by: