JP2010127690A - Car navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily find out and announce a route recommended as a less discharge amount of carbon dioxide. <P>SOLUTION: The car navigation device 1 includes a controller 2 constructed mainly from a microcomputer, a position detector 3 detecting a current position of a vehicle, a map data provision section 4, an operation section 5, an extrinsic information receiving section 6, a display device 7 consisting of color liquid crystal display, etc., and a voice output device 8. The controller 2 searches two or more routes for a designated destination, calculates a distance for each kind of roads within each route of the searched routes, sets a parameter for various factors to affect the discharge amount of carbon dioxide during travel per each kind of roads within each route, calculates an estimated discharge amount of carbon dioxide based on the distance for each kind of roads within each route and the parameter of each kind of roads, and announces the relative result of the estimated discharge amount of carbon dioxide in each route by the display device 7 and the voice output device 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a car navigation device that takes measures against carbon dioxide emissions.

Conventionally, as disclosed in Patent Document 1, a logic for calculating the amount of carbon dioxide emitted by an automobile has been researched and developed. Recently, it has been considered that a car navigation device obtains a carbon dioxide emission amount using the calculated value for a plurality of searched routes and presents a route with a smaller carbon dioxide emission amount. In addition, there is a technique described in Patent Document 2 as a technique for calculating the fuel consumption amount for each route instead of directly obtaining the carbon dioxide emission amount. In this system, the state of the drive system, for example, the amount of heat of the working fluid that operates the clutch or brake is stored, the heat storage state of the release heat radiation tank, whether the torque converter lockup / slip prohibition control is being executed, whether the automatic transmission is over The fuel consumption for each candidate route is calculated in consideration of whether the overdrive prohibition control prohibiting the use of the drive stage is being executed or not, and the state of charge of the battery.
JSCE Proceedings No. 695 “Model for estimating carbon dioxide emissions from automobiles in urban road traffic: Takashi Oguchi Masahiko Katakura Masaaki Taniguchi, Tokyo Metropolitan University” Japanese Patent Application No. 2002-188932

  By the way, it is extremely difficult to apply the logic for calculating the carbon dioxide emission amount to the above-described technology of the car navigation apparatus. In particular, the logic for calculating carbon dioxide emissions includes important factors, that is, various carbon dioxide emission influencing factors (for example, the number of times the vehicle is stopped and travel time, acceleration resistance, rolling resistance, air resistance, etc.). Yes, in relation to this factor, it is important to calculate the carbon dioxide emissions in multiple search routes, but it is difficult to determine the actual carbon dioxide emissions, and it is easy to determine the recommended route with low carbon dioxide emissions There is a problem that is not.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a car navigation device capable of easily indexing and notifying a recommended route with a small amount of carbon dioxide emission.

  The present invention has been made paying attention to the following points. That is, it is difficult to calculate the actual value of carbon dioxide emission. However, in a car navigation apparatus, if a relatively small amount of carbon dioxide emissions is known among a plurality of search routes, a search route with a small amount of carbon dioxide emissions can be recommended. On the other hand, in the searched route, the carbon dioxide emissions of various carbon dioxide emissions influencing factors (for example, the number of times the vehicle is stopped and the travel time, acceleration resistance, rolling resistance, air resistance, etc.) depending on the type of road. Are relatively different. Also, the amount of carbon dioxide emissions varies depending on the type of road in the searched route. Therefore, for each road type in the searched route, parameters are set for various carbon dioxide emission influencing factors in the driving situation, and based on the distance for each road type in the route and the parameter for each road type. By calculating the carbon dioxide emission guideline, it is possible to easily determine the small amount of the relative carbon dioxide emission with a plurality of search routes.

  The invention of claim 1, which pays attention to this point, calculates the distance for each route type in the route for each route searched by the route type distance calculation means, and the road type in each route. Since the carbon dioxide emission guideline is calculated based on the parameters set for various carbon dioxide emission influencing factors in each driving situation and the distance for each road type in each route, a plurality of search routes are used. Since it is possible to easily calculate the relatively small amount of carbon dioxide emissions, and to inform the notification means of the relative results of the carbon dioxide emission guideline results in each route, the relative carbon dioxide emissions A small number of recommended search routes can be broadcast.

  The invention according to claim 2 is characterized in that the road type is divided into a highway system, a general toll road system, a main local road system, and a general road system. It is possible to properly classify the differences, and it is possible to make a good difference in the carbon dioxide emission standard result for each search route.

  The invention of claim 3 sets a reference value parameter for a carbon dioxide emission influencing factor that is invariant to the road type among the various carbon dioxide emission influencing factors, and for other carbon dioxide emission influencing factors, There is a feature in that a relative parameter is set with respect to the reference value parameter. According to this, the reference parameter can be appropriately set, and the relative parameter can be easily set.

  The invention of claim 4 uses the various carbon dioxide emission influencing factors as the number of stops of the vehicle, acceleration resistance, rolling resistance, and air resistance, and among the number of stops of the vehicle, acceleration resistance, rolling resistance, and air resistance, A standard value parameter is set for rolling resistance, which is a factor that affects carbon dioxide emissions that is invariant to the road type, and other parameters that affect carbon dioxide emissions are set relative to the standard value parameter. There is a feature, and according to this, the reference parameter can be set appropriately, and it becomes easy to set other relative parameters appropriately with respect to the rolling resistance parameter.

  The invention according to claim 5 is characterized in that the parameter is made different depending on a difference in vehicle type. According to this, a recommended search route corresponding to a vehicle type such as a gasoline vehicle, a diesel vehicle, or a hybrid vehicle is set. Can present.

  In the invention of claim 6, the distance calculated for each type of road in the route is distinguished according to the degree of vehicle congestion, and the distance classified according to the degree of vehicle congestion is large in the degree of vehicle congestion. It is characterized by the fact that the higher the weighting is.

  The amount of carbon dioxide emission increases as the degree of vehicle congestion increases (the more traffic congestion occurs). Therefore, according to the sixth aspect of the present invention, the distance divided according to the degree of vehicle congestion is weighted so as to increase as the degree of vehicle congestion increases. It becomes possible to make a proper determination according to the above, and the relative comparison result of the carbon dioxide emission becomes more accurate.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An embodiment in which the present invention is applied to a car navigation apparatus will be described with reference to the drawings. FIG. 1 is a block diagram showing an electrical configuration of the car navigation apparatus. The car navigation device 1 includes a control device 2 mainly composed of a microcomputer, a position detector 3 for detecting the current position of the vehicle, a map data providing unit 4, an operation unit 5, an external information receiving unit 6, a color liquid crystal display And the like, and a sound output device 8 including a speaker or the like. FIG. 3 shows a display screen 7D of the display device 7.

  The control device 2 includes a CPU 2a, a ROM 2b, a RAM 2c, a nonvolatile memory 2d including a flash memory, a timer 2e, and the like. The control device 2 corresponds to route search means, road type distance calculation means, carbon dioxide emission guideline calculation means, and notification control means. The nonvolatile memory 2d corresponds to parameter storage means.

  Although not shown, the position detector 3 includes a G sensor for detecting the pitch angle of the vehicle, a gyroscope for detecting the roll angle of the vehicle, a distance sensor for detecting the travel distance of the vehicle, and a radio wave transmitted from an artificial satellite. And a GPS receiver for GPS (Global Positioning System) that detects (positions) the current position of the vehicle. Based on the signal from the position detector 3, the control device 2 detects the current position, traveling direction, speed, travel distance, current time, etc. of the vehicle with high accuracy. The position detector 3 may be a steering rotation sensor, a wheel sensor for each rolling wheel, or the like in addition to the above-described components.

  The map data providing unit 4 is a map data recording medium that records various data such as road map data, landmark data, map matching data, destination data (facility database), and table data for converting traffic information into road data. It is comprised by the drive device for reading data from. As the map data recording medium, a large-capacity storage medium such as a DVD is generally used, but a medium such as a memory card or a hard disk device may be used.

  The above road map data includes data such as road shape, road condition (rolling resistance, slope resistance), road width, road name, signal, railroad crossing, building, various facilities, place name, topography, etc., and the road map is displayed. Data to be displayed on the screen of the device 7 is included. Destination data consists of information about transportation facilities such as stations, leisure facilities, accommodation facilities, public facilities, various stores such as retail stores, department stores, restaurants, residences, condominiums, and place names. The data includes data such as the telephone number, address, latitude and longitude, and data for displaying landmarks indicating facilities on the screen of the display device 7 on the road map. It is configured.

  Although not shown in detail, the operation unit 5 includes a mechanical switch provided near the screen of the display device 7, a touch panel provided on the screen of the display device 7, and a remote control switch. The user (driver) uses this operation unit 5 to input a destination, information necessary for searching for the destination, and various commands for switching the screen and display mode of the display device 7. It is like that.

  The external information receiving unit 6 receives data by wireless communication with an external, for example, VICS (Vehicle Information & Communication System: VICS is a registered trademark) center or various information centers, and acquires traffic jam information and the like. Is possible.

  The display device 7 corresponds to notifying means, and a map around the position of the vehicle is displayed on the screen at various scales, and the current position and traveling direction of the vehicle are superimposed on the display. A current location mark (pointer) is displayed. Further, when searching for a route to the destination, a plurality of searched routes are displayed simultaneously. When the route guidance to this destination is executed, a route guidance screen is displayed. Further, the display device 7 displays an input screen for the user to input information necessary for searching for the destination, search for the destination and setting, various messages, and the like. It has become.

The voice output device 8 corresponds to a notification means, and outputs a voice message for route guidance and performs various voice notifications.
Here, the function as the route search means in the control device 2 is to automatically calculate a recommended travel route from the starting point (current position) of the vehicle to the destination, and for example, the Dijkstra method is used as the method. It is used.

  The nonvolatile memory 2d stores parameters set for various carbon dioxide emission influencing factors in the driving situation for each road type. The contents of the parameters are shown in FIG. As can be seen from FIG. 4, the types of roads are expressway systems (including highways, urban highways, and general toll roads), general toll road systems (including general toll roads), and main local road systems (national roads). , Main local roads, prefectural roads), general road system (general road 1 (main line), general road 2 (other guideways), introduction road, narrow street 1, narrow street 2 (not displayed during travel)) It is divided into. In FIG. 4, as a default, the traveling speed is assumed to be 90 km / h in the expressway system, 60 km / h is assumed in the general toll road system, 45 km / h is assumed in the main local road system, The road system assumes 25 km / h.

  In addition, the carbon dioxide emission influencing factors include the number of stoppages and travel distance, acceleration resistance, rolling resistance and gradient resistance, and air resistance. Of these various carbon dioxide emission influencing factors, Reference value parameter k (when the road type is a major local road system and the vehicle type is a gasoline vehicle or a diesel vehicle), the reference value parameter for rolling resistance and gradient resistance corresponding to invariable factors affecting carbon dioxide emissions kh (when the road type is the main local road system and the vehicle type is a hybrid vehicle) is set. It should be noted that a parameter corresponding to a hybrid vehicle is indicated when the second digit of the symbols indicating the parameters (for example, k, kh described above, and l, lh, h, hh, d, dh, etc. described later) is “h”.

For other carbon dioxide emission influencing factors, parameters relative to the reference value parameters k and kh are set as follows.
The following describes how to set parameters for gasoline vehicles and diesel vehicles (and how to set parameters for hybrid vehicles). Each set parameter is stored in the nonvolatile memory 2d.

  For example, the carbon dioxide emission influencing factor “air resistance” is proportional to the square of the speed but is uniform with respect to the speed because it does not affect the vehicle type (vehicle type using fuel). And compared with the fuel consumption by the rolling resistance of 45 km / h of the main local road system, that is, the carbon dioxide emission, the fuel consumption by the air resistance, that is, the carbon dioxide emission is small. Focusing on this point, the parameter L corresponding to gasoline and diesel vehicles in the main local road system is k> l, and further, “general toll road system” (its parameter is h) and “highway system” (the The parameter d) has a higher assumed speed and the assumed speed is lower in the “general road system” (its parameter is p), so that d> h> l> p is proportional to the square of the assumed speed. . Since the fuel system is uniform as described above, d = dh, h = hh, l = 1h, and p = ph.

  Further, since the rolling resistance and the gradient resistance are factors that influence the carbon dioxide emission amount that is invariant with respect to the road type, the parameters of the road type of the rolling resistance and the gradient resistance are k = c = g = o = kh = ch = gh = oh.

  In addition, the acceleration resistance parameters j, jh, f, fh, b, bh, n, nh will be described. Since the acceleration resistance can be considered to be almost constant speed running without so-called stop and go in the expressway system, Regardless of the vehicle type, the parameters b and bh are small (may be the lowest value), and in general toll roads there is some acceleration / deceleration, but it can be said that the vehicle is almost constant speed, so the parameters f and fh are independent of the vehicle type. Slightly smaller than or equal to b (may be the lowest value), and it can be said that there are stop and go in the main local road system but less than the general road system, so the parameter j is larger than b and f, but the acceleration resistance of the general road system Is smaller than the parameter n. This general road system has a lot of stop-and-go, and the carbon dioxide emission level is equivalent to the reference value parameter k of the rolling resistance and the gradient resistance of the main local road system.

  Therefore, the parameters b, f, j, and n described above are b = f, f <j <n, and n = k, and b = f = bh = fh. In this case, in the main local road system and the general national road system, the hybrid vehicle can take into account the amount of electric travel, so jh <j, nh <n, and in particular the general road system can be covered by almost electric travel, so jh> nh Yes.

Next, parameters a, ah, e, eh, i, ih, m, and mh for the number of stops and travel time will be described. Since there is no signal in the highway system, the parameters a and ah may be small (the minimum value may be acceptable). In addition, since there are many cases where there is no signal in the general toll road system, the parameters e and eh may be small (the minimum value may be sufficient). In the main local road system, there is a signal, but there are fewer signals than in the general road system, so the parameter i is smaller than the general road system parameter m and larger than the general toll road system.
Accordingly, the parameters a, e, i, m are set as a = e, e <i <m. In this case, in the case of a hybrid vehicle, the parameter ih is set to i> ih and the parameter mh is set to m> mh.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing the contents of the processing performed by the control device 2 only in the part related to the gist of the present invention. When the destination setting operation is performed in the state where the current position is detected (step S1) (step S2), the control device 2 searches for a plurality of routes (step S3). As the plurality of routes, as shown in FIG. 3, there are a traffic congestion consideration route, a pay priority route, a general priority route, a distance priority route, and another route. Note that the ranking display (display indicated by the display area LH) in FIG. 3 is not performed at the stage of step S3.

  In the next step S4, first, for the searched congestion-considered route, the road type distance EW (highway system distance), OR (general toll road system distance), NR (main local road system), GR shown in FIG. (General road system) is calculated. In the next step S5, the above-described road type distances are classified into distances for each degree of congestion, and in step S6, the vehicle type (whether a gasoline car, a diesel car, or a hybrid car) is acquired.

In step S7, the road type traveling estimated speed is set. In FIG. 4, as shown above, the default is 90 km / h for the expressway system, 60 km / h for the general toll road system, 45 km / h for the main local road system, and 25 km / h for the general road system. Can be set. By this assumed speed change setting, it can be changed to an air resistance parameter or acceleration resistance parameter corresponding to the assumed speed.
In step S8, a carbon dioxide emission amount is calculated for the searched route. This calculation formula is calculated from the formulas shown in columns * 1 to * 4 and columns * 1h to * 4h in FIG. 4 and the following formula (1).

In other words, if the vehicle type is gasoline or diesel,
As the highway system parameter total value α, α = a + b + c + d is calculated,
As general toll road system parameter total value β, β = e + f + g + h is calculated,
Γ = i + j + k + l is calculated as the main local road system parameter total value γ,
As general road system parameter total value δ, δ = m + n + o + p is calculated.

If the vehicle type is a hybrid vehicle,
As the highway system parameter total value αh, αh = ah + bh + ch + dh is calculated,
As general toll road system parameter total value βh, βh = eh + fh + gh + hh is calculated,
Γh = ih + jh + kh + lh is calculated as the main local road system parameter total value γh,
Δh = mh + nh + oh + ph is calculated as the general road system parameter total value δh.

  The equation (1) is for the case where the vehicle type is a gasoline vehicle or a diesel vehicle. However, in the case of a hybrid vehicle, αh, βh, γh, δh is used instead of α, β, γ, δ.

  In addition, a smoothing cost (coefficient) S as a weighting of the distances EWs, ORs, NRs, and GRs when the degree of congestion is smooth, and a congesting cost as a weighting of the distances EWc, ORc, NRc, and GRc when the congestion degree is favorable ( The relationship between the coefficient (C) and the traffic cost (coefficient) J as a weighting of the distances EWj, ORj, NRj, and GRj when there is traffic is S <C <J.

The above-mentioned parameter total values, the above-described coefficients, and the road type distance are substituted into the equation (1) to calculate the carbon dioxide emission amount in the search route.
In the next step S9, it is determined whether or not the calculation of carbon dioxide emission has been completed for all the search routes. If it is determined that the calculation has been completed, the process proceeds to step S10 to execute ranking processing. That is, comparing the calculation results of carbon dioxide emissions for each searched route (congestion-considered route, toll priority route, general priority route, distance priority route, and another route)・ Determine the ranking.

  In the next step S11, ranking display is executed. That is, the ranking display is performed on the display area LH of the display screen shown in FIG. 3 (the relative result of the carbon dioxide emission guideline calculation result is notified to the notification means). In this case, the voice output device 8 is also notified by voice.

  According to the present embodiment, the distance EW, OR, NR, GR is calculated for each road type in the route for each route searched for by the road type distance calculating means functioning in the control device 2. The distance is calculated and distinguished according to the degree of vehicle congestion, and the weighting (costs S, C, J) is increased as the degree of vehicle congestion increases, and the driving situation for each road type in each route Parameters a to p and ah to ph are set with respect to various carbon dioxide emission influencing factors (vehicle stop count and travel distance, acceleration resistance, rolling resistance and gradient resistance, air resistance). Based on ah to ph, the distance for each road type in each route, the distance for each congestion degree, and the weight, the carbon dioxide emission guideline is calculated by the equation (1). Typical Since it is possible to easily determine the small amount of carbon dioxide emission, and to inform the display device 7 and the sound output device 8 of the relative result of the carbon dioxide emission standard result in each route, the relative carbon dioxide A recommended search route with a small emission amount can be notified.

In particular, according to the present embodiment, the distance divided according to the degree of vehicle congestion is weighted so as to increase as the degree of vehicle congestion increases, so the carbon dioxide emission amount is appropriately determined according to the degree of vehicle congestion. And the relative comparison of carbon dioxide emissions will be more accurate.
In addition, according to the present embodiment, the road type is classified into the expressway system, the general toll road system, the main local road system, and the general road system, so that the difference in carbon dioxide emission by the road type can be properly classified. It is possible to make a good difference in the carbon dioxide emission guideline results for each search route.

  Further, according to the present embodiment, the reference value parameter k is set for the carbon dioxide emission influencing factors that are invariant to the road type among the various carbon dioxide emission influencing factors, and other carbon dioxide emission influencing factors are set. The factor is characterized in that a relative parameter is set with respect to the reference value parameter. According to this, the reference parameter can be appropriately set, and the relative parameter can be easily set.

  In this case, the various carbon dioxide emission influencing factors are vehicle stop count, acceleration resistance, rolling resistance, and air resistance. Among these vehicle stop count, acceleration resistance, rolling resistance, and air resistance, the road type The standard value parameter is set for rolling resistance, which is an invariant factor affecting carbon dioxide emissions, and the other carbon dioxide emission influencing factors are characterized by setting parameters relative to the standard value parameter. According to this, the reference parameter can be set appropriately, and it becomes easy to set other relative parameters appropriately with respect to the rolling resistance parameter.

  In addition, according to the present embodiment, the parameter is different depending on the vehicle type, and according to this, the recommended search according to the vehicle type such as a gasoline vehicle, a diesel vehicle, or a hybrid vehicle. A route can be presented.

The present invention is not limited to the above embodiment, and may be implemented as follows.
In the above embodiment, the distance calculated for each road type in the route is distinguished according to the degree of vehicle congestion, and the degree of vehicle congestion is greater than the distance divided according to the degree of vehicle congestion. However, the classification and weighting according to the degree of vehicle congestion may be provided as necessary. In this case, the distance (EW, OR) is determined for each road type in the route. , NR, GR), parameters a to p and ah to ph set for various carbon dioxide emission influencing factors in the driving situation for each road type in each route, and the road type in each route The carbon dioxide emission guideline may be calculated based on each distance.

The calculation formula for CO2 emissions in this case is
CO2 emissions = α × EW + β × OR + γ × NR + δ × GR
(In the case of a hybrid vehicle, αh, βh, γh, and δh are used instead of α, β, γ, and δ). In this way, it is possible to easily determine the relative amount of carbon dioxide emission by a plurality of search routes. Therefore, even in this way, the intended purpose can be achieved.
In addition, each parameter in the embodiment may be changed as appropriate. Further, only the display device may be used as the notification means.

1 is a block diagram of an electrical configuration of a car navigation apparatus showing an embodiment of the present invention. Flow chart showing control contents Figure showing the display screen Diagram showing various parameters

Explanation of symbols

  In the drawings, 1 is a car navigation device, 2 is a control device (route search means, road type distance calculation means, carbon dioxide emission guideline calculation means, notification control means), 2d is a nonvolatile memory (parameter storage means), and 3 is A position detector, 4 is a map data providing unit, 6 is an external information receiving unit, 7 is a display device (informing unit), and 8 is an audio output unit (informing unit).

Claims (6)

Route search means capable of searching a plurality of routes for a set destination;
For each route searched for a route, a road type distance calculating means for calculating a distance for each road type in the route;
For each road type in each route, parameter storage means for storing parameters set for various carbon dioxide emission influencing factors in driving conditions;
Carbon dioxide emission guideline calculating means for calculating a carbon dioxide emission guideline based on the distance for each road type in each route and the parameter for each road type;
A car navigation apparatus comprising: a notification control unit that causes a notification unit to notify a relative result of a carbon dioxide emission guideline result in each route.   The car navigation device according to claim 1, wherein the road type is divided into an expressway system, a general toll road system, a main local road system, and a general road system.   Among the various carbon dioxide emission influencing factors, a reference value parameter is set for a carbon dioxide emission influencing factor that is invariant with respect to the road type, and other carbon dioxide emission influencing factors are set with respect to the reference value parameter. The car navigation device according to claim 1 or 2, wherein a relative parameter is set. The various carbon dioxide emission influencing factors are the number of stops of the vehicle, acceleration resistance, rolling resistance, air resistance,
Among these vehicle stop counts, acceleration resistance, rolling resistance, and air resistance, a reference value parameter is set for rolling resistance, which is an influential factor of carbon dioxide emissions for the road type, and other factors that influence carbon dioxide emissions. The car navigation device according to any one of claims 1 to 3, wherein a parameter relative to the reference value parameter is set.   The car navigation device according to any one of claims 1 to 4, wherein the parameter differs depending on a vehicle type.   The distance calculated for each road type in the route is distinguished according to the degree of vehicle congestion, and the distance classified according to the degree of vehicle congestion is weighted so as to increase as the degree of vehicle congestion increases. The car navigation device according to claim 1, wherein the car navigation device is provided.

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