JP2008032542A - Route guidance device for vehicles - Google Patents

Abstract

A vehicle route guidance apparatus capable of traveling in accordance with a calculated desired fuel consumption amount is provided.
A vehicle route guidance apparatus 1 according to the present invention is a vehicle route guidance device comprising a search means 2a for searching for a route to a destination, and a display means 2b for displaying the searched route. The vehicle speed pattern calculating means 2c for calculating the vehicle speed pattern based on the searched route and the fuel consumption calculating means 2e for calculating the fuel consumption amount of the route based on the vehicle speed pattern are provided, and the display means 2b is a fuel consumption amount. The vehicle speed pattern is displayed.
[Selection] Figure 1

Description

  The present invention relates to a vehicular route guidance apparatus installed in a vehicle.

  In recent years, for the purpose of improving the convenience of users, many vehicles have been searched for the position and destination of the own vehicle and the shortest time or the shortest distance route using search map information stored in a database in advance. A vehicle route guidance device that presents the position and destination of the host vehicle and the searched route to the user together with display map information is provided.

In this vehicular route guidance device, as described in Patent Document 1, when a destination is set, fuel consumption up to the destination is considered in consideration of the type of road on the searched route and the degree of traffic congestion. It has been proposed to calculate the amount and present this calculated fuel consumption to the user.
JP 2006-58085 A

  However, in such a vehicular route guidance device, although the fuel consumption when traveling on the searched route is calculated and presented to the user, what vehicle speed pattern (acceleration, deceleration, It is unclear whether the vehicle should be driven by selecting (steady speed), and the calculated fuel consumption and the fuel consumption after the actual driving will not match, and it may not be possible to drive at the desired fuel consumption. The problem arises. In addition, since the fuel consumption is calculated from the conventional driving situation, there is a problem that the calculation accuracy of the fuel consumption is low and the fuel consumption cannot be achieved with the desired fuel consumption.

  In view of the above problems, an object of the present invention is to provide a vehicle route guidance apparatus that can travel in accordance with a calculated desired fuel consumption.

In order to solve the above problems, a vehicle route guidance apparatus according to the present invention provides:
A vehicle route guidance apparatus comprising: search means for searching for a route to a destination; and first display means for displaying the searched route,
Vehicle speed pattern calculating means for calculating a vehicle speed pattern based on the searched route, and fuel consumption calculating means for calculating fuel consumption of the route based on the vehicle speed pattern, and the fuel consumption and the It has the 2nd display means which displays a vehicle speed pattern, It is characterized by the above-mentioned.

  The vehicle speed pattern is a vehicle speed pattern in which the horizontal axis represents time or distance and the vertical axis represents vehicle speed.

  Here, the vehicle includes a route dividing unit that divides the searched route, the vehicle speed pattern calculating unit calculates a vehicle speed pattern for each of the divided routes, and the fuel consumption calculating unit is configured for each of the divided routes. It is preferable to calculate the fuel consumption.

  As a result, the calculation accuracy of the fuel consumption can be increased, and the vehicle speed pattern adapted to the actual travel environment can be calculated and displayed to the user.

  In addition, it is preferable that the route dividing unit divides the searched route for each point where a vehicle on the route is predicted to stop.

  According to this, the route can be more appropriately divided, and the calculation accuracy of the fuel consumption can be improved. Note that the route may be divided for each point where the vehicle speed is equal to or lower than a predetermined threshold (for example, 5 km / h) instead of using the fact that the vehicle stops as a determination factor.

Or in order to solve said problem, the route guidance apparatus for vehicles by this invention is the following.
A vehicle route guidance apparatus comprising: search means for searching for a route to a destination; and first display means for displaying the searched route,
Vehicle speed pattern calculating means for calculating a vehicle speed pattern based on the searched route, route dividing means for dividing the searched route for each point where a vehicle on the route is predicted to stop, and the divided A fuel consumption amount calculating means for calculating the fuel consumption amount for each route may be provided, and a second display means for displaying the fuel consumption amount may be provided.

  This also increases the accuracy of fuel consumption calculation.

  ADVANTAGE OF THE INVENTION According to this invention, the route guidance apparatus for vehicles which can drive | work corresponding to the calculated desired fuel consumption can be provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing an embodiment of a car navigation device which is a vehicle route guidance device according to the present invention.

  The car navigation device 1 includes a car navigation ECU 2, a GPS antenna 3, an IMU 4, an antilock brake system (ABS) 5, a steering sensor 6, a receiver 7, a database 8, a display 9, a speaker 10, a touch panel 11, and an engine ECU 12. Composed.

  The car navigation ECU 2 (Electronic Control Unit) is constituted by, for example, a CPU, a ROM, a RAM, and a data bus connecting them, and the CPU performs the following processing according to a program stored in the ROM. The car navigation ECU 2 includes a search unit 2a, a display unit 2b, a vehicle speed pattern calculation unit 2c, a route division unit 2d, and a fuel consumption calculation unit 2e.

  The car navigation ECU 2 is connected with a GPS antenna 3, an IMU (Inertia Measurement Unit) 4, a steering sensor 6, a display 9, a speaker 10, a touch panel 11, a receiver 7, and a database 8, and An ABS (anti-lock brake system) 5 and the engine ECU 12 are connected according to a communication standard such as CAN or FlexRay.

  A GPS (Global Positioning System) antenna 3 receives radio waves from three military satellites among a plurality of military satellites launched above the earth, and based on these radio waves, search means 2a Measures the position of the vehicle, that is, the longitude and latitude based on the principle of triangulation. When measuring altitude in addition to longitude and latitude, four military satellites are used.

  Here, the IMU 4 detects the yaw rate of the vehicle, and the steering sensor 6 is provided in a vehicle steering device (not shown) to detect the steering angle. The touch panel 11 is an input device for a user to input search conditions such as a destination and a target time and vehicle characteristics used for calculation of fuel consumption, which will be described later. It is composed of a storage medium and stores and stores map information for display and map information for search.

  The display 9 displays the route searched by the search means 2a based on the destination input by the touch panel 11 together with the map information for display under the instruction of the display means 2b. The ABS 5 is a device that prevents the wheel from being locked during braking, and obtains a vehicle speed to be used for the control from a wheel speed sensor (not shown).

  Further, the receiver 7 is compliant with light or radio beacon, and receives road information from a VICS (Vehicle Information & Communication System). In VICS, general road information collected by the police and highway information collected by the Highway Public Corporation are sent to the VICS Center, and the edited information is transmitted by FM multiplex broadcasting, radio wave beacons or optical beacons. is there.

  The information sent by VICS is mainly congestion information (congestion section and distance), but the time required from the location of the vehicle to the destination, traffic regulation due to road construction, speed regulation, chain regulation, parking lot information, earthquake・ Includes emergency information such as tsunami. Transmission methods include FM multiplex broadcasting (wide area communication method using NHK FM), radio beacon (communication method mainly installed on expressways), and optical beacon (communication method using infrared rays to main general roads). There are three receivers for each information transmission method, but if there is no receiver that conforms to light or radio wave beacon, it will not be possible to search for a congestion section avoidance route called DRG (Dynamic Route Guidance). As described above, the receiver 7 preferably conforms to a light or radio beacon. Information transmitted by VICS is displayed by three methods: character display, simple graphic display, and map display.

  When measuring the position of the vehicle using the GPS antenna 3 described above, when the vehicle is located in a valley of a high-rise building or the vehicle is traveling in a tunnel due to the characteristics of using radio waves from military satellites. Alternatively, when the vehicle is traveling under a viaduct, the GPS antenna 3 cannot receive radio waves, and thus there is a problem that the position of the vehicle cannot be measured.

  Therefore, when the GPS antenna 3 cannot receive radio waves, the searching means 2a moves the vehicle based on the vehicle speed detected by the ABS 5, the yaw rate detected by the IMU 4, and the steering angle detected by the steering sensor 6. The distance and direction are calculated to measure the position of the own vehicle, and in addition to the measurement of the position of the own vehicle using the GPS antenna 3, the accuracy of the measurement of the total position of the own vehicle is increased. Note that the vehicle speed is not limited to being acquired from the ABS 5, and can be acquired from such devices as long as the vehicle is equipped with, for example, VSC (Vehicle Dynamic Control), ECB (Electronic Control Brake), or the like.

  Then, the display means 2b uses the display map information (signal, temporarily stopped) in the database 8, the position of the host vehicle measured by the method described above, the destination input by the touch panel 11, and the receiver 7. The position of the vehicle on the map is specified and displayed on the display 9 by combining the received information such as traffic regulations and traffic jam sections and the route searched by the search means 2a.

  Further, the vehicle speed pattern calculation means 2c calculates a vehicle speed pattern that minimizes the fuel consumption in the route searched by the search means 2a, and the route division means 2d detects the point where the vehicle is predicted to stop (signal, temporarily stop, road The route searched by the search means 2a is divided for every traffic restriction by construction), and the fuel consumption calculation 2e is based on the vehicle speed pattern for each divided route, and the fuel from the current own vehicle position to the destination The consumption is calculated by a map which will be described later, which is determined by the vehicle characteristics described above. The fuel consumption calculation 2e calculates the instantaneous fuel consumption based on the accelerator opening obtained from the engine ECU 12.

  Accordingly, the display unit 2b displays the fuel consumption calculated by the fuel consumption calculation 2e on the display 9 to the user, and displays the vehicle speed pattern for each divided route to the user. Further, the display means 2b displays the target vehicle speed pattern at the vehicle position on the route searched by the search means 2a and the current vehicle speed acquired by the ABS 5 on the lower right side of the display 9 as shown in FIG. indicate. Moreover, the display means 2b may display the reachable time to the destination on the display 9.

The control contents of the car navigation apparatus according to the present invention described above will be described with reference to the drawings.
FIG. 2 is a schematic diagram illustrating an example of a display screen of a display showing a method of dividing a searched route of the car navigation device according to the present invention. FIG. 3 shows a vehicle speed pattern for each divided route.

  In FIG. 2, “start” indicates the position of the host vehicle, and “end” indicates the destination input by the touch panel 11. If there are signal A, stop B, signal C, and signal D in order on the route from the vehicle position start to the destination end, it is assumed that there is no signal that can be passed as a blue signal here. The route dividing means 2d uses the signal A, the stop B, the signal C, and the signal D as the point where the vehicle is predicted to stop, and the route is based on the points A, B, C, and D (a) and (b). (C) Divide into (d) and (e).

  For each of the divided routes, the vehicle speed pattern calculation means 2c selects a vehicle speed pattern that combines two types of acceleration, one type of steady speed, and two types of deceleration as shown in FIG. In this case, the area of the vehicle speed pattern for each divided route, that is, the total distance is made to coincide with the length of the route from the vehicle position to the destination.

  The vehicle speed pattern with the smallest fuel consumption is obtained as follows using the map determined by the vehicle characteristics described above. FIG. 4 is a map showing the correlation between steady speed and fuel consumption, and FIG. 5 is a map showing the correlation between acceleration and fuel consumption.

For example, when the distance of the divided route (a) is 800 m and the target time is 100 s, the steady speed at which the fuel consumption is minimum is 32 km / h from the map shown in FIG. The vehicle speed pattern calculation means 2c first determines the steady speed as 32 km / h. Since the distance of the route (a) is 800 m and the target time is 100 s, the vehicle speed pattern calculation is performed so that the area of the vehicle speed pattern shown in FIG. 3 is 800 m and the intersection of the vehicle speed pattern with the horizontal axis is 100 s. The means 2c determines the acceleration and deceleration. Here, the acceleration from the vehicle speed of zero is 1.03 m / s ² , the acceleration in the transient state from the acceleration to the steady speed is 0.72 m / s ² , and the deceleration is from the steady speed. deceleration transient state until 0.13 m / ^{s 2,} to calculate the deceleration and 0.5 m / ^{s 2.}

Here, the acceleration and the deceleration are calculated after calculating the steady speed, but the steady speed and the deceleration may be calculated after calculating the acceleration using a map as shown in FIG.
Further, although not shown here, the acceleration and steady speed may be calculated after calculating the deceleration based on the map of the deceleration and the fuel consumption. The parameter shown on the left side in FIG. 5 is acceleration (0.2 to 2.5). Here, the steady speed at which the fuel consumption determined by the map is minimum is 32 km / h, but the steady speed at which the fuel consumption determined by the map is minimum is the speed limit on the route. In the case of exceeding the limit speed, it is preferable to set the speed limit to a steady speed in order to comply with the speed limit.

  That is, the map held by the vehicle speed pattern calculation means 2c of the car navigation ECU 2 is a map showing the correlation between the steady speed and the fuel consumption, a map showing the correlation between the acceleration and the fuel consumption, and the correlation between the deceleration and the fuel consumption. A map showing the relationship, a map showing the correlation between the acceleration in the transient state from the acceleration to the steady speed and the fuel consumption, a map showing a correlation between the deceleration in the transient state from the steady speed to the deceleration and the fuel consumption It is a multidimensional map that is constructed.

  Using the map in this way, acceleration and deceleration can be realized as vehicle characteristics by calculating the vehicle speed pattern that minimizes fuel consumption under the conditions of the input target time and the distance of the searched route. Therefore, it is possible to eliminate the necessity of increasing the capacity of the ROM and RAM of the car navigation ECU 2. Computational power and configuration can be simplified.

  Further, when the gradient obtained from the map information in the database 8 is included on the divided route, as shown in FIG. 6, the steady speed and the fuel consumption amount using the gradient (−1 to +3 deg) as parameters, Is used to correct the steady speed at which the fuel consumption is minimized.

  Further, in the case where a curved road obtained from the map information in the database 8 is included on the divided route, the correction obtained in advance by a cornering force determined by the turning radius r, the vehicle speed, and the road surface μ as shown in FIG. Using the coefficient CMAP (r, vel), the fuel consumption FC_S = f (distance, vel) for the straight road and the fuel consumption FC_R = f (distance, vel) × CMAP (r, vel) for the curved road Make corrections.

  The control content of the car navigation apparatus according to the present invention described above will be described with reference to a flowchart. FIG. 8 is a flowchart showing the control contents of the car navigation apparatus according to the present invention.

  In S1, when the user inputs the destination and the target time using the touch panel 11, the search means 2a searches for a route from the vehicle position and the destination in S2, and the route division means 2d searches the route and the database 8 for searching for the route. Based on the map information and road information obtained by VICS, information such as signals, temporary stops, construction regulations, etc. is acquired, and the route is divided for each point where the vehicle is predicted to stop. In S3, the vehicle speed pattern calculation means 2c selects any one of the divided paths and calculates the vehicle speed pattern that minimizes the fuel consumption by the method described above, and the fuel consumption calculation means 2e is based on this vehicle speed pattern. Calculate fuel consumption.

  In S5, based on this vehicle speed pattern, the display means 2b displays the target vehicle speed to the user on the display 9 together with the current vehicle speed acquired by the ABS 5. Of course, in addition to the speed, the instantaneous fuel consumption obtained by the acceleration and the accelerator opening may be displayed. In S6, when the vehicle speed pattern calculation means 2c determines that it becomes impossible to travel on the route within the target time by deviating from the vehicle speed pattern obtained in S4 due to a disturbance due to a change in the operation state on the route. Returning to S4, the vehicle speed pattern that minimizes the fuel consumption is calculated again.

  If it is determined in S6 that there is no disturbance, the process proceeds to S7, and the vehicle speed pattern calculation means 2c determines whether the calculation of the vehicle speed pattern by the processes of S4 to S5 has been performed on all the divided routes. If it is determined that the calculation of the vehicle speed pattern by the processing of S4 to S5 has been performed on all of the divided routes, the processing ends. If not, the processing returns to S3, and the processing from S3 to S7 Again.

  In this way, by dividing the searched route for each point where the vehicle is predicted to stop, calculating the vehicle speed pattern that minimizes the fuel consumption for each divided route, and calculating the fuel consumption, A fine vehicle speed pattern corresponding to the fuel consumption amount and corresponding to the actually traveling route can be presented to the user. As a result, the user does not select a vehicle speed pattern corresponding to the calculated fuel consumption, and deviates from the assumed vehicle speed pattern, so that the calculated fuel consumption does not match the actual fuel consumption. Can be prevented.

  Furthermore, by calculating the fuel consumption for each of the divided paths, the accuracy of calculation of the fuel consumption can be improved. This also allows the user to drive the vehicle in accordance with the calculated desired fuel consumption.

  In the first embodiment, the first display means and the second display means described in the claims are combined into one display means 2b. However, these may be provided as separate display means. . The configuration is shown below.

  FIG. 9 is a block diagram showing an embodiment of a car navigation device which is a vehicle route guidance device according to the present invention. Since the configuration other than the display means is the same as that shown in FIG. 1, the same reference numerals are given and the description thereof is omitted.

  The car navigation device 21 includes a car navigation ECU 2, a GPS antenna 3, an IMU 4, an antilock brake system (ABS) 5, a steering sensor 6, a receiver 7, a database 8, a display 9, a speaker 10, a touch panel 11, and an engine ECU 12. Composed.

  The car navigation ECU 2 (Electronic Control Unit) is constituted by, for example, a CPU, a ROM, a RAM, and a data bus connecting them, and the CPU performs the following processing according to a program stored in the ROM. The car navigation ECU 2 includes a search unit 2a, a first display unit 2b, a vehicle speed pattern calculation unit 2c, a route division unit 2d, a fuel consumption calculation unit 2e, and a second display unit 2f.

  The display 9 displays the route searched by the search means 2a based on the destination input from the touch panel 11 together with the map information for display under the instructions of the first display means 2b and the second display means 2f. It is. The ABS 5 is a device that prevents the wheel from being locked during braking, and obtains a vehicle speed to be used for the control from a wheel speed sensor (not shown).

  Then, the first display means 2b receives the map information for display in the database 8 (signal, temporarily stopped), the position of the vehicle measured by the above-described method, the destination input by the touch panel 11, and the reception. The position of the vehicle on the map is specified and displayed on the display 9 by combining the information such as traffic regulations and traffic congestion sections received by the machine 7 and the route searched by the search means 2a.

  Further, the second display means 2f displays the fuel consumption calculated by the fuel consumption calculation 2e on the display 9 to the user and also displays the vehicle speed pattern for each divided route to the user. Further, the second display means 2f displays the vehicle speed that is the target of the vehicle speed pattern at the vehicle position on the route searched by the search means 2a and the current vehicle speed acquired by the ABS 5 on the display 9 as shown in FIG. Display in the lower right. Since the control contents and the flowchart are the same as those shown in the first embodiment, description and illustration are omitted. Alternatively, the second display means 2f may display the fuel consumption amount and the vehicle speed pattern on a dedicated display (not shown).

  Also according to the second embodiment, the searched route is divided for each point where the vehicle is predicted to stop, the vehicle speed pattern that minimizes the fuel consumption is calculated for each divided route, and the fuel consumption is calculated. By calculating, it is possible to present to the user a fine vehicle speed pattern corresponding to the fuel consumption and corresponding to the actual travel route. As a result, the user does not select a vehicle speed pattern corresponding to the calculated fuel consumption, and deviates from the assumed vehicle speed pattern, so that the calculated fuel consumption does not match the actual fuel consumption. Can be prevented.

  Furthermore, by calculating the fuel consumption for each of the divided paths, the accuracy of calculation of the fuel consumption can be improved. This also allows the user to drive the vehicle in accordance with the calculated desired fuel consumption.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  For example, in this embodiment, the vehicle speed pattern is a combination of two types of acceleration, one type of steady speed, and two types of deceleration. However, the vehicle speed pattern may be changed as appropriate according to the route conditions. Is possible. That is, a plurality of types of acceleration and a plurality of types of deceleration can be used.

  Further, in FIG. 2, the signals A, C, and D are assumed to be points where the vehicle is expected to stop, but it is obvious in advance that, among these signals, for example, the signal C can be passed as a blue signal by the VICS information or the like. In some cases, the signal C can be excluded from points where the vehicle is expected to stop.

  Further, as a method for displaying the vehicle speed pattern to the user, in the present embodiment, the current vehicle speed and the target vehicle speed of the vehicle speed pattern are displayed side by side on the display 11, but a graph indicating the vehicle speed pattern is displayed as it is. Is also possible. In this case, the horizontal axis may be time or distance.

  The present invention relates to a vehicular route guidance device capable of calculating and displaying the fuel consumption amount of a searched route, and displaying a more accurate fuel consumption amount to a user and realizing the fuel consumption amount. Therefore, it is possible to display to the user what vehicle speed pattern should be operated, and the user can execute the driving according to the calculated fuel consumption. Thereby, the effect of calculating and displaying the fuel consumption amount to the user can be enhanced, and energy saving can be promoted, which is useful when applied to various vehicles such as passenger cars, trucks and buses.

1 is a block diagram showing an embodiment of a car navigation device according to the present invention. It is a schematic diagram which shows the path | route of the car navigation apparatus concerning this invention, and the display content of a display. It is a schematic diagram which shows an example of the vehicle speed pattern for every divided | segmented path | route of the car navigation apparatus which concerns on this invention. It is a schematic diagram which shows an example of the map which shows the correlation with the steady speed with which the car navigation apparatus which concerns on this invention is provided, and fuel consumption. It is a schematic diagram which shows an example of the map which shows the correlation with the acceleration with which the car navigation apparatus which concerns on this invention is provided, and fuel consumption. It is a schematic diagram which shows an example of the map which shows the correlation of the gradient and fuel consumption of the car navigation apparatus which concerns on this invention. It is a schematic diagram which shows an example of the map which shows the correlation with the curved road of the car navigation apparatus which concerns on this invention, and fuel consumption. It is a flowchart which shows the control content of the car navigation apparatus concerning this invention. It is a block diagram which shows other embodiment of the car navigation apparatus which concerns on this invention.

Explanation of symbols

1 Car navigation system 2 Car navigation ECU
3 GPS antenna 4 IMU
5 ABS
6 Steering sensor 7 Receiver 8 Database 9 Display 10 Speaker 11 Touch panel 12 Engine ECU
21 Car navigation system

Claims (4)

A vehicle route guidance apparatus comprising: search means for searching for a route to a destination; and first display means for displaying the searched route,
Vehicle speed pattern calculating means for calculating a vehicle speed pattern based on the searched route, and fuel consumption calculating means for calculating fuel consumption of the route based on the vehicle speed pattern, and the fuel consumption and the A vehicle route guidance device comprising second display means for displaying a vehicle speed pattern.   Route dividing means for dividing the searched route, the vehicle speed pattern calculating means for calculating a vehicle speed pattern for each of the divided routes, and the fuel consumption calculating means for fuel consumption for each of the divided routes. The vehicle route guidance apparatus according to claim 1, wherein an amount is calculated.   The vehicle route guidance apparatus according to claim 2, wherein the route dividing unit divides the searched route for each point where the vehicle on the route is predicted to stop. A vehicle route guidance apparatus comprising: search means for searching for a route to a destination; and first display means for displaying the searched route,
Vehicle speed pattern calculating means for calculating a vehicle speed pattern based on the searched route, route dividing means for dividing the searched route for each point where a vehicle on the route is predicted to stop, and the divided A vehicular route guidance apparatus comprising fuel consumption calculation means for calculating fuel consumption for each route, and second display means for displaying the fuel consumption.

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