JP4416756B2 - Navigation device - Google Patents

Description

  The present invention relates to an in-vehicle navigation device having an energy-saving driving support function that supports energy-saving driving in consideration of fuel efficiency, and in particular, rapid acceleration based on information acquired from various sensors and positioning means by the navigation device. The present invention relates to a navigation apparatus that identifies deceleration and identifies whether or not sudden acceleration / deceleration is an appropriate operation depending on the position of a vehicle on a running road.

  Conventionally, there are known navigation devices and navigation systems that guide a user by searching for a route from a desired departure point to a destination using map data and road data. Such navigation devices and navigation systems are known. As a car navigation device that is installed in a car and guides the route to the driver, a mobile phone is used as a navigation terminal to send a route search request to the route search server, receive the result, and receive route guidance Navigation systems have been put into practical use.

  The car navigation device uses a GPS (Global Positioning System), receives GPS signals transmitted from a plurality of GPS satellites orbiting the earth with a GPS antenna, The position is specified by analyzing the satellite position and clock information included in the signal. At least four GPS satellites are required. The single positioning accuracy of GPS is generally over 10 m, but it is improved to 5 m or less by adopting DGPS (Differential GPS).

  The navigation device includes a road network database for route search. This road network database includes roads (routes) of map data, node data with nodes such as knots and inflection points as nodes, link data with routes connecting each node as links, and cost information for all links. Link cost data having (distance and required time) is accumulated. The navigation device refers to this database and sequentially searches for a link from the starting node to the destination node, and traces the node having the smallest cost information of the link and the link as a guide route, thereby shortening the shortest. Search and guide the route. As a route search method using such a database, a method called label determination method or Dijkstra method is used.

  Recently, the effective use of the global environment and energy resources has become a major issue, suppressing the deterioration of the global environment caused by exhaust gas from driving a car and preventing inappropriate consumption of energy resources. A system for being considered. Such a function can be called an energy-saving driving support function.For example, when data indicating the driving situation is collected from the vehicle and there is a driving situation in which the consumption of energy such as fuel becomes inappropriate, A system for reporting statistically or in real time has been proposed.

  Such a system having an energy saving driving support function is disclosed as a vehicle operation management system in, for example, the following Patent Document 1 (Japanese Patent Laid-Open No. 2003-316864). The vehicle operation management system disclosed in Patent Document 1 includes an information center that collects data indicating a driving situation from a vehicle. Each vehicle is provided with a control circuit, which acquires vehicle information such as speed and engine speed from various sensors and transmits it to the information center. The information center analyzes the current driving state of the vehicle from the vehicle information and issues an instruction to protect the energy saving operation when the energy saving operation is not executed. The control circuit displays an instruction from the information center on the display.

For example, the following items are set as conditions determined that the energy-saving operation is not performed. In other words, when the engine speed is higher than the speed, that is, the engine speed is high even though the engine is running at a low speed, or the engine speed frequently increases despite a small speed change. If this occurs, sudden acceleration / deceleration frequently occurs if the engine speed is high or the engine is idling for a long period of time even if the mileage does not increase, or if a shift position suitable for the speed is not selected. In this case, the vehicle speed is high, the shift position changes frequently in a short time, or the accelerator opening changes frequently in a short time. Similarly, it is possible to incorporate functions that support safe driving.
JP2003-316864A (FIG. 1, paragraphs [0015] and [0016])

  However, the operation management system disclosed in the above-mentioned Patent Document 1 installs an in-vehicle device that collects data related to driving conditions and transmits it to the information center in the vehicle, and displays information from the information center on the in-vehicle device. There is a problem that it is necessary to provide a function and the cost for installation is required. In addition, capital investment is required to set up an information center for operation management and driving support, which is inappropriate for a system that can be provided as a support device for many general drivers.

  A case where fuel is inappropriately consumed in an automobile is a case where a rapid acceleration / deceleration operation is performed. However, in the operation management and driving support system disclosed in Patent Document 1 described above, a vehicle having a vehicle-mounted device is used to detect that rapid acceleration / deceleration is frequently repeated and notify the vehicle-mounted device. Since the route is not analyzed, there is a problem in that it is necessary to uniformly determine whether the acceleration / deceleration operation is appropriate based on a certain standard.

  An automobile travels on roads of various shapes, and on a curve or the like, it is inevitable that the vehicle must be braked and decelerated for safety. In this case, a rapid deceleration operation is an appropriate operation. Moreover, the vehicle may travel on roads with different attributes such as highways and general roads. The highway has a normal traveling speed, and there are curves at ramps and interchanges, and the vehicle may suddenly decelerate and branch to a desired road. The deceleration operation in this case is also an appropriate operation. Conversely, when entering a highway from a curve, the vehicle may accelerate rapidly from a low speed to a high speed. Rapid acceleration in this case is also an appropriate driving operation.

  Further, detailed determination cannot be made by simply comparing the acceleration with a single threshold value and determining the rapid acceleration / deceleration operation. For example, when traveling on an expressway, the speed of movement is fast, so even if sudden acceleration / deceleration operations are performed due to factors such as air resistance, fluctuations in acceleration are small, and rapid acceleration / deceleration operations are performed unless the threshold is set appropriately. There is also a problem that it cannot be determined.

  That is, in the operation management and driving support system disclosed in Patent Document 1, since the situation of the road on which the vehicle is actually traveling cannot be known, rapid acceleration and deceleration are performed as described above. However, there is a problem in that it cannot be discriminated in detail whether it is an appropriate driving operation or an inappropriate driving operation, and effective energy-saving driving support cannot be performed.

  As a result of repeated studies to solve the above problems, the inventors of the present application have searched for a route from a desired departure point to a destination as an existing in-vehicle device for supporting driving. Focusing on the widespread use of navigation devices that guide the optimal route with the shortest distance and required time, based on information that navigation devices acquire from various sensors and positioning means, or map information including roads that are running If an appropriate threshold value is set in relation to the moving speed, and if the rapid acceleration / deceleration operation is an appropriate operation or an inappropriate operation, energy saving driving support is performed. The present invention has been completed by conceiving that problems can be solved.

  That is, the present invention has an object to solve the above problems, and has a driving support function for detecting and notifying that a rapid acceleration / deceleration operation has been performed, and setting an appropriate threshold value in relation to the moving speed. In addition, a navigation device is provided that detects that a sudden acceleration / deceleration operation has been performed.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
A route search unit that searches for a route from a specified departure point to a destination, a sensor unit that detects a traveling state of the vehicle, a GPS reception unit that measures a current position, a map storage unit that stores map information, In a navigation device comprising output means,
The navigation device further includes an acceleration determination unit, a threshold table that is classified according to the moving speed of the vehicle, and sets a threshold value for each moving speed, and a rapid acceleration / deceleration information recording unit, and the acceleration determination The unit obtains a corresponding threshold value from the threshold value table according to the moving speed of the vehicle, calculates acceleration based on the output of the sensor unit or the GPS receiving unit, compares it with the acquired threshold value, and suddenly accelerates or decelerates It is determined whether or not the operation has been performed, and rapid acceleration / deceleration information is recorded in the rapid acceleration / deceleration information recording unit.

  The invention according to claim 2 of the present application is characterized in that, in the navigation device according to claim 1, the sudden acceleration / deceleration information includes a place, time, and number of times that an inappropriate sudden acceleration / deceleration operation is performed.

  The invention according to claim 3 of the present application is the navigation device according to any one of claims 1 to 2, wherein when the acceleration determination unit determines the inappropriate sudden acceleration / deceleration, the output is performed. The means is notified to that effect.

  The invention according to claim 4 of the present application is the navigation device according to claim 1, wherein the acceleration determining unit determines that the acceleration calculated based on the output of the sensor unit or the GPS receiving unit exceeds a predetermined threshold. If the current position is on a straight road based on the current position information measured by the GPS receiving unit and the map information obtained from the map storage unit based on the current position, It is characterized by determining.

  The invention according to claim 5 of the present application is the navigation device according to claim 1, wherein the acceleration determining unit determines that the acceleration calculated based on the output of the sensor unit or the GPS receiving unit exceeds a predetermined threshold. If the current position is on a road having a predetermined curvature or less based on the current position information measured by the GPS receiving unit and the map information obtained from the map storage unit based on the current position, The acceleration / deceleration operation is determined.

In the invention according to claim 1,
The navigation device includes a route search unit, a sensor unit that detects a traveling state of the vehicle, a GPS receiving unit that measures a current position, a map storage unit that stores map information, an output unit, an acceleration determination unit, a vehicle A threshold table in which a threshold is set for each of the movement speeds, and a rapid acceleration / deceleration information recording unit, and the acceleration determination unit is configured to include the threshold table according to the movement speed of the vehicle. From the sensor unit or the GPS receiver, the acceleration is calculated and compared with the acquired threshold value, and it is determined whether or not sudden acceleration / deceleration has been performed. Information is recorded in the rapid acceleration / deceleration information recording unit.

  According to such a configuration, a rapid acceleration operation or a deceleration operation is performed without being affected by air resistance or the like by comparing the acceleration with an appropriately set threshold according to the moving speed of the vehicle. You will be able to identify things in detail. For this reason, a navigation device having an effective energy saving driving support function can be provided.

  In the invention according to claim 2, in the navigation device according to claim 1, the sudden acceleration / deceleration information includes a place, time, and number of times that an inappropriate sudden acceleration / deceleration operation is performed. According to such a configuration, it is possible to record the situation in which the rapid acceleration / deceleration operation is performed, and to perform detailed driving support.

  Moreover, in the invention concerning Claim 3, in the navigation apparatus concerning any one of Claim 1 thru | or 2, when the said acceleration determination part determines the said improper sudden acceleration / deceleration, the said This is notified to the output means. According to such a configuration, when an inappropriate sudden acceleration / deceleration operation is performed, the user is notified and energy saving operation can be promoted.

  Moreover, in the invention concerning Claim 4, in the navigation apparatus concerning Claim 1, the said acceleration determination part is that the acceleration calculated based on the output of the said sensor part or a GPS receiving part exceeded the predetermined threshold value. If it is determined, based on the current position information measured by the GPS receiver and the map information obtained from the map storage unit based on the current position, an inappropriate rapid acceleration / deceleration operation when the current position is on a straight road Is determined. According to such a configuration, it is possible to identify the appropriateness of the rapid acceleration / deceleration operation, and to perform fine energy-saving driving support.

  Moreover, in the invention concerning Claim 5, in the navigation apparatus concerning Claim 1, the said acceleration determination part is that the acceleration calculated based on the output of the said sensor part or a GPS receiving part exceeded the predetermined threshold value. If determined, it is inappropriate when the current position is on a road having a predetermined curvature or less based on the current position information measured by the GPS receiving unit and the map information obtained from the map storage unit based on the current position. Judged as sudden acceleration / deceleration operation. According to such a configuration, it is possible to identify the appropriateness of the rapid acceleration / deceleration operation, and to perform fine energy-saving driving support.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiments shown below exemplify a navigation device for embodying the technical idea of the present invention, and are not intended to specify the present invention for this navigation device. The present invention is equally applicable to navigation devices of other embodiments included in the scope.

  FIG. 1 is a block diagram illustrating a configuration of a navigation device 10 according to the first embodiment of the present invention. The navigation device 10 includes a control unit 11, a GPS receiving unit 12, a map storage unit 13, a display unit 14, a sensor unit 15, an input unit 16, a route storage unit 17, a sudden acceleration / deceleration information recording unit 18, an audio output unit 19, and the like. It is prepared for.

  The GPS receiving unit 12 is a positioning unit that receives signals transmitted from a plurality of GPS satellites and calculates the current position based on latitude and longitude, and determines the current position of the automobile on which the navigation device 10 is mounted for a predetermined time. Positioning is performed at intervals. The map storage unit 13 stores a map and network data (node, link, link cost) for route search.

  The display unit 14 is a display unit composed of a liquid crystal display unit or the like, and displays a map and a guidance route. The map and guide route displayed on the display unit 14 are displayed centering on the current position measured by the GPS receiving unit 12, and scrolled as the current position advances on the route. When the current position is in front of an intersection on the guidance route (predetermined distance), guidance such as the traveling direction (straight, right turn, left turn) of the intersection is displayed on the display unit 14 or a voice constituted by a speaker or the like. Or output via the output unit 19.

  The input unit 16 is an input means including a numeric keypad, character input keys, function keys, a touch panel, and the like, and the input unit 16 is a selection key for selecting an item on the menu screen displayed on the display unit 14 and a cursor key. It has.

  The control unit 11 is a control circuit composed of a microprocessor, and includes a ROM and a RAM (not shown). The ROM stores a program for controlling the operation of each part. For example, the program for the route search by the control unit 11 and the acceleration of the vehicle on which the navigation device 10 is mounted are detected and compared with a predetermined threshold value to determine whether or not a driving operation that causes rapid acceleration / deceleration has been performed. In addition, a program for determining whether rapid acceleration / deceleration is an appropriate operation or an inappropriate operation is stored based on a guide route on which the vehicle is traveling and information acquired from the GPS receiver 12. Therefore, the control unit 11 includes an acceleration determination unit 111 and a route search unit 113.

  The map displayed on the display unit 14 is acquired (read out) from a predetermined range of map information centered on the current position or from the map storage unit 13, and the center of the display screen is displayed as the current position. When a route search unit searches for a route and a guidance route is obtained, the guide route is displayed in a different color on the map displayed on the display unit 14 in a superimposed manner.

  In general, a route such as a home and a workplace that is running on a daily basis is not searched every time using a navigation function, only a map and a current position are displayed on the display unit 14 and used without receiving guidance. In most cases, the navigation function is used when going to a holiday or sightseeing spot or going to an unguided route by driving.

  The route search unit 113 refers to the route search network data stored in the map storage unit 13 according to the route search conditions such as the departure point and the destination input from the input unit 16 and guides the optimum route. Explore as. Information on the guidance route searched by the route search unit 113 and guidance information for each intersection node are stored in the route storage unit 17, the guidance route is displayed on the display unit 14, and voice guidance is performed via the voice output unit 19.

  The sensor unit 15 includes a vehicle speed sensor, a rudder angle sensor, an engine speed sensor, a timer, and the like. The sensor unit 15 detects a traveling state of the vehicle, and obtains a traveling locus by continuously measuring each sensor output. can do. The acceleration determination unit 111 calculates acceleration based on the vehicle speed sensor output of the sensor unit 15. Further, as will be described later, the acceleration can also be calculated based on the speed obtained from the current position measured by the GPS receiver 12 at a predetermined interval and the positioning time interval.

Further, the control unit 11 includes a threshold value table 112 for comparing accelerations. In the threshold value table 112, threshold values corresponding to road attributes are set as shown in FIG. That is, in the threshold value table 112, the acceleration threshold value (m / sec ² ) during acceleration and the acceleration threshold value (m / sec ² ) during deceleration are set for each road attribute. In the road attribute, acceleration thresholds are set for a general road having a speed limit of less than 40 km, a general road having a speed limit of 40 km or more, a side road / merge lane, and a highway.

  Also, threshold values for comparing acceleration during acceleration (the acceleration value becomes a positive value) and acceleration during deceleration (the acceleration value becomes a negative value) are set as different values in the threshold table 112. ing. The reason is that a desired acceleration is generated by a slight brake operation during deceleration, whereas it is necessary to depress the accelerator considerably in order to generate a desired acceleration during acceleration. For this reason, the threshold value is set to a value corresponding to each of the acceleration time and the deceleration time.

The acceleration determination unit 111 calculates acceleration based on the vehicle speed sensor output of the sensor unit 15. The acceleration can also be calculated based on the current position measured by the GPS receiving unit 12 at a predetermined interval and the speed obtained from the positioning time interval. When calculating the acceleration from the positioning data of the GPS receiver 12, for example, if the position is measured every second and the speed between AB and BC is 5 m / sec and 10 m / sec, respectively, the acceleration a = (V−Vo) / t = 10−5 / 1 = 5 m / sec ² ”. And it is discriminate | determined whether the calculated acceleration is more than a threshold value (rapid acceleration / deceleration was performed). If the acceleration falls below a predetermined threshold value, the number of times is counted as one rapid acceleration / deceleration operation.

  In order to make this determination, in the first embodiment, a corresponding threshold value is read out from the threshold values set in the threshold value table 112 according to the road attribute and compared. Which road attribute the vehicle is traveling on is determined by the road data of the map information read from the map storage unit 13 or the route search unit 113 based on the current position measured by the GPS receiving unit 12. It can be identified from the data of the guide route.

  For example, when the vehicle is traveling on an expressway and the acceleration determination unit 111 detects acceleration at the time of acceleration, the corresponding threshold value “3” (see FIG. 2) is compared as a threshold value, and the acceleration is equal to or greater than this threshold value. The presence or absence of a rapid acceleration operation is determined depending on whether or not there is. The same processing is performed when acceleration during deceleration is detected. In this way, by comparing the acceleration with the threshold value appropriately set according to the moving speed of the vehicle, it is possible to meticulously identify that an abrupt acceleration operation or deceleration operation has been performed without being affected by air resistance or the like. be able to.

  As described above, when the acceleration determination unit 111 detects a sudden acceleration / deceleration operation and determines that the operation is inappropriate, the location, time, and number of times the operation is performed are stored as the rapid acceleration / deceleration information. To do. And it alert | reports to a user via the display part 14 or the audio | voice output part 19. FIG.

  As described above, the acceleration determination unit 111 compares the acceleration calculated based on the output of the vehicle speed sensor or the GPS receiving unit 12 with the threshold value corresponding to the moving speed based on the road attribute, and performs inappropriate rapid acceleration / deceleration. Determine whether an operation has been performed. In this determination, the acceleration determination unit 111 is based on the current position information (latitude / longitude) measured by the GPS reception unit 12 and the map information obtained from the map storage unit 13 based on the current position, or the route search unit. Based on the information on the guide route searched by 113, it may be determined whether the rapid acceleration / deceleration operation is an appropriate operation or an inappropriate operation in consideration of the traveling state of the vehicle.

  For example, when the current position is on a curved road, it is determined as an appropriate operation, and when the current position is a straight road, it is determined as an inappropriate operation. A curved road and a straight road can be discriminated based on road attribute information when a curve is equal to or greater than a predetermined curvature, and determined as a straight road when the curve is equal to or less than a predetermined curvature. When the acceleration determination unit 111 determines that the operation is inappropriate, the location, time, and number of times the operation is performed are stored as the rapid acceleration / deceleration information. And it alert | reports to a user via the display part 14 or the audio | voice output part 19. FIG.

  As the curvature of the road for distinguishing between a curved road and a straight road, for example, on a highway, a road having a radius of curvature of “radius of 300 m” or less is curved, a road having a radius greater than that is a straight road, and a general road has a radius of curvature of “radius”. A road that is 150 m or less is set to be a curve, and a road that is more than that is determined to be a straight road.

  As described above, in the present invention, by comparing the threshold value set according to the moving speed based on the road attribute with the acceleration, it is possible to follow the acceleration change due to the influence of the air resistance at the time of high speed movement and finely inappropriate. It becomes possible to identify sudden acceleration / deceleration operations.

  Next, the operation procedure of the navigation device of the first embodiment will be described based on the flowchart of FIG. First, the acceleration determination unit 111 is traveling from the road data of the map information read from the map storage unit 13 based on the information on the guide route searched by the route search unit 113 or the information on the current position measured by the GPS receiving unit 12. Identify the road and get its road attributes. Next, it is determined whether or not the road attribute has changed in the process of step S12.

  When there is a change in the road attribute, the threshold value set for the corresponding road attribute is read from the threshold value table 112 in the process of step S13. If there is no change in the road attribute, the threshold value already read from the threshold value table 112 is used according to the road attribute so far. Then, in the process of step S14, the acceleration determination unit 111 calculates acceleration based on the sensor output of the sensor unit 15 or the GPS reception unit 12, and compares it with a threshold value to determine whether it is equal to or greater than the threshold value. If the acceleration is not greater than or equal to the threshold in this determination, the process returns to step S11.

  In the process of step S15, it is determined whether the acceleration is equal to or less than a threshold value. If the acceleration is not less than the threshold value, the process of step S15 is repeated. If the acceleration is less than the threshold value, it is determined that one rapid acceleration / deceleration operation has been performed, and the process proceeds to step S16.

  In the process of step S16, the acceleration determining unit 111 reads road information of map information read from the map storage unit 13 based on information on the guide route searched by the route search unit 113 or information on the current position measured by the GPS receiving unit 12. Whether the vehicle is traveling on an intersection or a curve is determined from the current position. If the vehicle is traveling on an intersection or a curve, it is determined that the operation is an appropriate rapid acceleration / deceleration operation, and the process returns to step S11.

If the vehicle is not traveling at an intersection or a curve, it is determined that the operation is an improper sudden acceleration / deceleration operation, and sudden acceleration / deceleration information is stored in the rapid acceleration / deceleration information recording unit 18 in the process of step S17. In the processing, the user is notified through an output means such as the display unit 14 or the audio output unit 19.

  The navigation device 10 according to the first embodiment described above is configured to include the threshold value table 112 in which threshold values are set according to road attributes, but the vehicle moving speed calculated from the output of the GPS receiving unit 12 or the sensor unit. The actual moving speed of the vehicle detected by the 15 vehicle speed sensors may be divided into several moving speed sections, and a threshold value table shown in FIG. 4 may be provided in which a threshold is set for each moving speed section. The other configuration of the navigation apparatus 10 according to the second embodiment is the same as that of the navigation apparatus 10 according to the first embodiment shown in FIG. 1 except for the threshold value table 114, and description of each component is omitted to avoid duplication.

The threshold value table shown in FIG. 4 divides the moving speed of the vehicle into five moving speed sections of 20 km / h or less, 20 to 40 km / h, 40 to 60 km / h, 60 to 80 km / h, and 80 km or more. The acceleration threshold value (m / sec ² ) during acceleration and the acceleration threshold value (m / sec ² ) during deceleration are set for each road attribute for each moving speed category. For example, the acceleration threshold during acceleration at a moving speed of 80 km or more is 4 (m / sec ² ).

  Next, the operation procedure of the navigation apparatus 10 according to the second embodiment will be described with reference to the flowchart of FIG. First, the acceleration determining unit 111 detects the moving speed of the vehicle from the vehicle speed sensor output of the sensor unit 15 or the output of the GPS receiving unit 12 in the process of step S21. Next, in the process of step S22, the threshold value table (see FIG. 4) is referred to based on the moving speed, and the threshold value (acceleration threshold value) set in the corresponding moving speed category is read out.

  In the process of step S23, the acceleration determining unit 111 calculates the acceleration based on the sensor output of the sensor unit 15 or the output of the GPS receiving unit 12, and compares this with the threshold value read in the process of step S22, which is equal to or greater than the threshold value. Determine whether. If the acceleration is not greater than or equal to the threshold in this determination, the process returns to step S21.

  In the process of step S24, it is determined whether the acceleration is equal to or less than a threshold value. If the acceleration is not less than the threshold value, the process of step S24 is repeated. If the acceleration is less than the threshold value, it is determined that one rapid acceleration / deceleration operation has been performed, and the process proceeds to step S25.

  In the process of step S25, the acceleration determination unit 111 reads the road information of the map information read from the map storage unit 13 based on the information on the guide route searched by the route search unit 113 or the information on the current position measured by the GPS receiving unit 12. Whether the vehicle is traveling on an intersection or a curve is determined from the current position. If the vehicle is traveling on an intersection or curve, it is determined that the operation is an appropriate rapid acceleration / deceleration operation, and the process returns to step S21.

  If the vehicle is not traveling at an intersection or a curve, it is determined that the operation is an inappropriate sudden acceleration / deceleration operation, and sudden acceleration / deceleration information is stored in the rapid acceleration / deceleration information recording unit 18 in the process of step S26. In the processing, the user is notified through an output means such as the display unit 14 or the audio output unit 19.

  As described above, according to the present invention, in a navigation device having a driving support function for detecting and notifying that a rapid acceleration / deceleration operation has been performed, an appropriate threshold value is set in relation to the moving speed. Since it is detected that the rapid acceleration / deceleration operation has been performed, a navigation device having an effective energy saving driving support function can be provided.

It is a block diagram which shows the structure of the navigation apparatus concerning Example 1 of this invention. It is a figure which shows an example of the threshold value table with which the navigation apparatus concerning Example 1 of this invention is equipped. It is a flowchart which shows the operation | movement procedure in the navigation apparatus concerning Example 1 of this invention. It is a figure which shows an example of the threshold value table with which the navigation apparatus concerning Example 2 of this invention is equipped. It is a flowchart which shows the operation | movement procedure in the navigation apparatus concerning Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Navigation device 11 ... Control part 111 ... Acceleration judgment part 112 ... Threshold table 113 ... Route search part 12 ... GPS receiving part 13 ... Map storage part 14 .... Display unit 15 .... Sensor unit 16 .... Input unit 17 ... Route storage unit 18 ... Sudden acceleration / deceleration information recording unit 19 ... Audio output unit

Claims (5)

A route search unit that searches for a route from a specified departure point to a destination, a sensor unit that detects a traveling state of the vehicle, a GPS reception unit that measures a current position, a map storage unit that stores map information, In a navigation device comprising output means,
The navigation device further includes an acceleration determination unit, a threshold table that is classified according to the moving speed of the vehicle, and sets a threshold value for each moving speed , and a rapid acceleration / deceleration information recording unit, and the acceleration determination department also depending on the traveling speed of the vehicle to obtain the corresponding threshold value from the threshold table, the comparison with the acquired threshold value to calculate the acceleration based on an output of the sensor section or the GPS reception section, quick acceleration A navigation device characterized by determining whether or not deceleration has been performed and recording rapid acceleration / deceleration information in the rapid acceleration / deceleration information recording unit.   The navigation device according to claim 1, wherein the sudden acceleration / deceleration information includes a place, time, and number of times that an inappropriate sudden acceleration / deceleration operation is performed. 3. The navigation according to claim 1, wherein the acceleration determination unit notifies the output unit of the fact when the inappropriate acceleration / deceleration is determined. apparatus.   When the acceleration determination unit determines that the acceleration calculated based on the output of the sensor unit or the GPS reception unit exceeds a predetermined threshold, the acceleration determination unit is based on the current position information and the current position measured by the GPS reception unit. The navigation device according to claim 1, wherein the rapid acceleration / deceleration operation is determined to be inappropriate when the current position is on a straight road based on the map information obtained from the map storage unit. When the acceleration determination unit determines that the acceleration calculated based on the output of the sensor unit or the GPS reception unit exceeds a predetermined threshold, the acceleration determination unit is based on the current position information and the current position measured by the GPS reception unit. 2. The navigation device according to claim 1, wherein an inappropriate sudden acceleration / deceleration operation is determined when the current position is on a road having a predetermined curvature or less based on map information obtained from the map storage unit. .

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