WO2011030397A1 - Fuel consumption display device, fuel consumption display method, and fuel consumption display program - Google Patents

Abstract

A fuel consumption display device applied, for example, to a navigation device includes an average fuel consumption calculation means, an average fuel consumption comparison means, and a display means. The average fuel consumption calculation means acquires as a past average fuel consumption, an average fuel consumption from the power ON time upon start of use of the fuel display device to the power OFF time upon the previous drive completion; and as a current average fuel consumption, an average fuel consumption from the power ON time upon the current drive start to the current time. The average fuel consumption means compares the past average fuel consumption to the current average fuel consumption. The display means displays the comparison result between the current average fuel consumption and the past average fuel consumption.

Description

Fuel consumption display device, fuel consumption display method, and fuel consumption display program

The present invention relates to a fuel consumption display device that displays fuel consumption.

In recent years, a method for transmitting vehicle information such as fuel efficiency to a driver has been devised from the viewpoint of ecology and fuel economy. For example, Patent Document 1 describes a technique for displaying a deviation of instantaneous fuel consumption with respect to average fuel consumption on a fuel consumption meter as fuel consumption information.

JP 2007-298494 A

By the way, in the technique described in Patent Document 1, the display on the fuel consumption meter is performed by swinging the pointer with respect to the neutral position. However, since the instantaneous fuel consumption fluctuates greatly and the swing of the pointer also increases accordingly, the driver can not only grasp the fuel consumption but can only know the instantaneous fuel consumption evaluation. For this reason, with the technique described in Patent Document 1, the driver cannot know the evaluation of the fuel consumption for the current driving as a whole.

Examples of problems to be solved by the present invention include the above. This invention makes it a subject to provide the fuel consumption display apparatus which can know the evaluation of the fuel consumption about the whole driving | operation this time.

The invention according to claim 1 is a fuel consumption display device that displays an evaluation of a fuel consumption of a vehicle, and based on a travel history of the vehicle, a previous operation from a power-on time at the start of use of the fuel consumption display device. Average fuel consumption until the power-off time at the time of completion is obtained as the past average fuel consumption, and average fuel consumption calculation means for obtaining the average fuel consumption from the power-on time at the start of the current operation to the current time as the current average fuel consumption, An average fuel consumption comparison unit that compares the average fuel consumption with the current average fuel consumption and a display unit that displays a comparison result between the current average fuel consumption and the past average fuel consumption are provided.

The invention according to claim 6 is a fuel consumption display method for displaying an evaluation of the fuel consumption of a vehicle by a fuel consumption display device, wherein a power-on time at the start of use of the fuel consumption display device is based on a travel history of the vehicle. The average fuel consumption calculation process from the power-on time to the current time at the start of the current operation as the current average fuel consumption And an average fuel consumption comparison step for comparing the past average fuel consumption with the current average fuel consumption, and a display step for displaying a comparison result between the current average fuel consumption and the past average fuel consumption.

The invention according to claim 7 is a fuel consumption display program executed by a fuel consumption display device that displays an evaluation of the fuel consumption of a vehicle, and is based on a travel history of the vehicle when starting to use the fuel consumption display device. The average fuel consumption from the power-on time to the power-off time at the completion of the previous operation is calculated as the past average fuel consumption, and the average fuel consumption from the power-on time to the current time at the start of the current operation is calculated as the current average fuel consumption. The fuel consumption display device is caused to function as a fuel consumption calculation unit, an average fuel consumption comparison unit that compares the past average fuel consumption with the current average fuel consumption, and a display unit that displays a comparison result between the current average fuel consumption and the past average fuel consumption. It is characterized by that.

It is a figure which shows the apparatus structure of a navigation apparatus. It is a schematic diagram for demonstrating the fuel consumption evaluation method which concerns on a present Example. It is an example of the display of the comparison result of the past average fuel consumption and this average fuel consumption. It is a schematic diagram for demonstrating the fuel consumption evaluation method which concerns on a present Example. It is a schematic diagram for demonstrating the fuel consumption evaluation method which concerns on a present Example. It is a flowchart which shows the control processing which concerns on a present Example.

In one aspect of the present invention, a fuel consumption display device that displays an evaluation of fuel consumption of a vehicle is based on a travel history of the vehicle, and when a previous driving is completed from a power-on time at the start of use of the fuel consumption display device. The average fuel consumption until the power-off time is determined as the past average fuel consumption, and the average fuel consumption calculation means for determining the average fuel consumption from the power-on time at the start of the current operation to the current time as the current average fuel consumption, and the past average fuel consumption Average fuel consumption comparison means for comparing with the current average fuel consumption, and display means for displaying a comparison result between the current average fuel consumption and the past average fuel consumption.

The fuel consumption display device described above is applied to, for example, a navigation device, and includes an average fuel consumption calculation unit, an average fuel consumption comparison unit, and a display unit. The average fuel consumption calculation means calculates the average fuel consumption from the power-on time at the start of use of the fuel consumption display device to the power-off time at the completion of the previous operation as the past average fuel consumption, and turns on the power at the start of the current operation The average fuel consumption from the time to the current time is obtained as the current average fuel consumption. The average fuel consumption comparison unit compares the past average fuel consumption with the current average fuel consumption, and the display unit displays a comparison result between the current average fuel consumption and the past average fuel consumption. The average fuel consumption calculation means, average fuel consumption comparison means, and display means are realized by a system controller of the navigation device, for example. By doing in this way, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the entire current driving, in comparison with the past average fuel consumption.

According to another aspect of the fuel consumption display device, the average fuel consumption calculation means may be configured such that when the time from the power-off time to the power-on time of the fuel consumption display device is less than a predetermined time, the power-off time The power-on time is not regarded as the power-off time at the completion of the previous operation and the power-off time at the completion of the current operation. By doing in this way, the rest time of the driver can be included in the current driving.

In another aspect of the fuel consumption display device, the average fuel consumption calculation unit may be configured such that when the fuel consumption information is initialized, the power is cut off when the previous operation is completed from the initialization time of the fuel consumption information. When the travel distance up to the time becomes greater than a predetermined distance, the average fuel consumption from the initialization time of the fuel consumption information to the power-off time at the completion of the previous operation is obtained as the past average fuel consumption. By doing in this way, an exact past average fuel consumption can be calculated | required and the precision improvement of evaluation of this average fuel consumption can be aimed at.

In another aspect of the fuel consumption display device, the average fuel consumption calculation unit is configured such that when the fuel consumption information is initialized, a time from a power-off time to a power-on time of the fuel consumption display device is predetermined. Even if it is less than the time, the power-off time and the power-on time are regarded as the power-off time when the previous operation is completed and the power-off time when the current operation is completed. By doing in this way, a past average fuel consumption can be calculated | required at an early stage, and it becomes possible to evaluate this time average fuel consumption early.

According to another aspect of the fuel consumption display device, the average fuel consumption calculation means may start from a new sensor learning completion time of the sensor when a sensor for detecting the running state of the vehicle is initialized. The average fuel consumption up to the current time is obtained as the current average fuel consumption. By doing so, it is possible to obtain an accurate current average fuel consumption, and to improve the accuracy of the evaluation of the current average fuel consumption.

In another aspect of the present invention, the fuel consumption display method for displaying the evaluation of the fuel consumption of the vehicle by the fuel consumption display device is based on the travel history of the vehicle and the previous time from the power-on time at the start of use of the fuel consumption display device. The average fuel consumption calculation step of obtaining the average fuel consumption from the power-on time to the current time at the start of the current operation as the current average fuel consumption, while obtaining the average fuel consumption up to the power-off time at the time of completion of operation as the past average fuel consumption, An average fuel consumption comparison step for comparing the past average fuel consumption with the current average fuel consumption, and a display step for displaying a comparison result between the current average fuel consumption and the past average fuel consumption. Also by this method, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the entire current driving, in comparison with the past average fuel consumption.

According to still another aspect of the present invention, a fuel consumption display program executed by a fuel consumption display device that displays an evaluation of fuel consumption of a vehicle is based on a travel history of the vehicle and a power source at the start of use of the fuel consumption display device. The average fuel consumption from the power-on time to the current time is calculated as the average fuel efficiency from the power-on time to the current time at the start of the current operation. The fuel consumption display device is caused to function as calculation means, average fuel efficiency comparison means for comparing the past average fuel efficiency with the current average fuel efficiency, and display means for displaying a comparison result between the current average fuel efficiency and the past average fuel efficiency. With this fuel consumption display program, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the entire current driving, in comparison with the past average fuel consumption.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Navigation device]
First, the device configuration of the navigation device 1 to which the fuel consumption display device of the present invention is applied will be described. FIG. 1 shows a device configuration of a navigation device 1 mounted on a vehicle.

As shown in FIG. 1, the navigation device 1 includes a self-supporting positioning device 10, a GPS receiver 18, a system controller 20, a disk drive 31, a data storage unit 36, a communication interface 37, a communication device 38, a display unit 40, and an audio output. A unit 50 and an input device 60 are provided.

The self-supporting positioning device 10 includes an acceleration sensor 11, an angular velocity sensor 12, and a distance sensor 13. The acceleration sensor 11 is made of, for example, a piezoelectric element, detects vehicle acceleration, and outputs acceleration data. The angular velocity sensor 12 is composed of, for example, a vibrating gyroscope, detects the angular velocity of the vehicle when the direction of the vehicle is changed, and outputs angular velocity data and relative azimuth data. The distance sensor 13 measures a vehicle speed pulse composed of a pulse signal generated with the rotation of the vehicle wheel.

The GPS receiver 18 is a radio wave 19 that carries downlink data including positioning data (GPS data) from a plurality of GPS satellites to be used for detecting the absolute position of the vehicle from latitude and longitude information. This is the part that receives

The system controller 20 includes an interface 21, a CPU (Central Processing Unit) 22, a ROM (Read Only Memory) 23, and a RAM (Random Access Memory) 24, and is configured to control the entire navigation device 1. . Further, the system controller 20 obtains a traveling state such as the acceleration, speed, and traveling distance of the vehicle every unit time based on the detection signal from each sensor of the autonomous positioning device 10, and associates these traveling states with the time. Is stored in the data storage unit 36 as a travel history.

The interface 21 performs an interface operation with the acceleration sensor 11, the angular velocity sensor 12, the distance sensor 13, and the GPS receiver 18. From these, acceleration data, relative azimuth data, angular velocity data, GPS positioning data, absolute azimuth data and the like are input to the system controller 20 in addition to the vehicle speed pulse. The CPU 22 controls the entire system controller 20. The ROM 23 includes a nonvolatile memory (not shown) in which a control program for controlling the system controller 20 is stored. The RAM 24 stores various data such as route data preset by the user via the input device 60 so as to be readable, and provides a working area to the CPU 22.

A system controller 20, a disk drive 31 such as a CD-ROM drive or a DVD-ROM drive, a data storage unit 36, a communication interface 37, a display unit 40, an audio output unit 50, and an input device 60 are connected via a bus line 30. Are connected to each other.

The disk drive 31 reads and outputs content data such as music data and video data from a disk 33 such as a CD or DVD under the control of the system controller 20. The disk drive 31 may be either a CD-ROM drive or a DVD-ROM drive, or may be a CD and DVD compatible drive.

The data storage unit 36 is configured by, for example, an HDD or the like, and stores various data used for navigation processing such as map data.

The communication device 38 includes, for example, an FM tuner, a beacon receiver, and the like, and acquires information distributed from a VICS (Vehicle Information Communication System) center or the like.

The display unit 40 displays various display data on the display screen of the display 44 under the control of the system controller 20. For example, when displaying map data as display data on the display screen, the system controller 20 reads map data from the data storage unit 36, and the display unit 40 is read from the data storage unit 36 by the system controller 20. Map data is displayed on the display screen. The display unit 40 includes a graphic controller 41 that controls the entire display unit 40 based on control data sent from the CPU 22 via the bus line 30, and image information that can be displayed immediately, such as a VRAM (Video） RAM) memory. A buffer memory 42 that temporarily stores, a display control unit 43 that controls display of a display 44 such as a liquid crystal display or a CRT (Cathode Ray Tube) based on image data output from the graphic controller 41, and a display 44 are provided. Configured. The display 44 is composed of, for example, a liquid crystal display device having a diagonal size of about 5 to 10 inches, and is mounted near the front panel in the vehicle.

The audio output unit 50 performs D / A (Digital-to-Analog) conversion of audio digital data sent from the CD-ROM drive 31, DVD-ROM 32, RAM 24, or the like via the bus line 30 under the control of the system controller 20. A D / A converter 51 to perform, an amplifier (AMP) 52 that amplifies the audio analog signal output from the D / A converter 51, and a speaker 53 that converts the amplified audio analog signal into sound and outputs the sound into the vehicle. It is prepared for.

The input device 60 includes keys, switches, buttons, a remote controller, a voice input device, and the like for inputting various commands and data. The input device 60 is disposed around the front panel and the display 44 of the main body of the in-vehicle electronic system mounted in the vehicle. When the display 44 is a touch panel system, the touch panel provided on the display screen of the display 44 also functions as the input device 60.

[Fuel efficiency evaluation method]
Next, the fuel consumption evaluation method according to this embodiment will be described with reference to FIGS. FIG. 2 is a schematic diagram for explaining the fuel efficiency evaluation method according to the present embodiment.

In the navigation device 1 according to the present embodiment, a past average fuel consumption that is an average fuel consumption before the start of the current driving and a current average fuel consumption that is an average fuel consumption during the current driving are obtained, and the past average fuel consumption and the current average fuel consumption are calculated. The comparison is performed and the comparison result is displayed on the display 44. More specifically, as shown in FIG. 2, the past average fuel consumption is the first power-on time when the navigation device 1 is installed in the vehicle, that is, the power-on time when the navigation device 1 starts to be used. It is the average fuel consumption from (that is, ACC-ON time) t0 to the power-off time (that is, ACC-OFF time) t1 when the previous operation was completed. The current average fuel consumption is an average fuel consumption from the ACC-ON time t2 to the current time tp at the start of the current operation. Here, the current average fuel consumption is updated every predetermined time (for example, every 3 seconds), and accordingly, the comparison result between the past average fuel consumption and the current average fuel consumption is also updated every predetermined time and displayed on the display 44. This control is realized by the system controller 20 executing a program.

FIG. 3 is an example of a display of a comparison result between the past average fuel efficiency and the current average fuel efficiency. In the navigation device 1, the comparison result between the past average fuel efficiency and the current average fuel efficiency is displayed on the display 44 together with map information and information indicating the current location. In FIG. 3, a triangular mark 85 indicates the current position of the vehicle, and a broken line 86 indicates a route that is a guide route of the vehicle. In the example shown in FIG. 3, the comparison result between the past average fuel efficiency and the current average fuel efficiency is displayed in the window 81.

In the window 81, for example, three categories of “total fuel consumption”, “general road”, and “toll road” are shown. In the “total fuel consumption” category 82, a comparison result between the past average fuel efficiency and the current average fuel efficiency regardless of the road type is displayed. The “average road” category 83 displays a comparison result between the past average fuel efficiency when traveling on a general road and the current average fuel efficiency, and the “toll road” category 84 indicates past results when traveling on a toll road. A comparison result between the average fuel consumption and the current average fuel consumption is displayed.

Specifically, the system controller 20 determines whether or not the vehicle is traveling on a toll road based on, for example, a flag indicating whether or not the toll road is in the road data in the map data. If the system controller 20 determines that the vehicle is not traveling on a toll road, the system controller 20 considers that the vehicle is traveling on a general road. The system controller 20 obtains the past average fuel consumption when the vehicle traveled on the general road before the start of the current driving and the current average fuel consumption when the vehicle traveled on the general road during the current driving, and compared the results. Is displayed in the category 83 of “general road”. Further, the system controller 20 obtains the past average fuel consumption when the vehicle traveled on the toll road before the start of the current driving and the current average fuel consumption when the vehicle traveled on the toll road before the current driving, The comparison result is displayed in the category 84 of “toll road”.

In FIG. 3, as a display example of the comparison result between the past average fuel efficiency and the current average fuel efficiency, the ratio of the difference between the current average fuel efficiency and the past average fuel efficiency to the past average fuel efficiency is displayed as a gauge in each category. In FIG. 3, the gauge for “total fuel consumption” is indicated by hatching 82a, and the gauge for “general road” is indicated by hatching 83a. Here, “toll road” is indicated as “average fuel consumption unknown”. This will be described in detail later.

In each category, “Ave” indicates the position where the current average fuel efficiency and the past average fuel efficiency are the same. In each category, when the gauge extends in the plus “+” direction with “Ave” as a reference, this indicates that the current average fuel consumption is better than the past average fuel consumption, and the gauge in the minus “−” direction. In the case of increasing, this indicates that the average fuel efficiency is worse than the past average fuel efficiency. If the gauge does not extend to either side, this indicates that the current average fuel consumption and the past average fuel consumption are the same.

Also, for example, when the gauge stretched in the positive direction extends to a scale of + 50%, this indicates that the current average fuel efficiency is improved by 50% compared to the past average fuel efficiency. In addition, when the gauge extending in the negative direction extends to a scale of −50%, it indicates that the current average fuel efficiency is 50% worse than the past average fuel efficiency.

By doing in this way, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the current driving, in comparison with the past average fuel consumption.

Here, the method for obtaining the past average fuel efficiency and the current average fuel efficiency will be specifically described. First, a general calculation method for obtaining the average fuel consumption will be described.

The average fuel efficiency is obtained using the fuel efficiency estimation formula. When the average fuel consumption is FCC, the fuel consumption is Fc, and the travel distance is Ds, the fuel consumption estimation formula is expressed by the following formula (1).

　ここで、燃料消費量Ｆｃは、ｔを時間、単位時間当たりの燃料消費量をｆｃとすると、以下の式（２）で示される。

Here, the fuel consumption Fc is expressed by the following equation (2), where t is time and fuel consumption per unit time is fc.

　具体的には、燃料消費量Ｆｃは、単位時間当たりの燃料消費量ｆｃを時間について足し合わせたものである。また、単位時間当たりの燃料消費量ｆｃは、単位時間当たりの速度をｖ、単位時間当たりの加速度をｄｖ／ｄｔとすると、以下の式（３）より求められる。ここで、ｈ、ｋ１、ｋ２、ｋ３はそれぞれ係数を示す。これらの係数は、予め適合値として求められ、ＲＯＭ２３などに記憶されている。

Specifically, the fuel consumption amount Fc is obtained by adding the fuel consumption amount fc per unit time with respect to time. Further, the fuel consumption amount fc per unit time can be obtained from the following equation (3), where v is the speed per unit time and dv / dt is the acceleration per unit time. Here, h, k1, k2, and k3 indicate coefficients. These coefficients are obtained in advance as suitable values and stored in the ROM 23 or the like.

　つまり、システムコントローラ２０は、速度ｖ及び加速度ｄｖ／ｄｔを走行履歴より取得し、取得された速度ｖ及び加速度ｄｖ／ｄｔを式（３）に代入することにより、単位時間当たりの燃料消費量ｆｃを求める。システムコントローラ２０は、求められた単位時間当たりの燃料消費量ｆｃを時間について足し合わせることで燃料消費量Ｆｃを求め、求められた燃料消費量Ｆｃで走行距離Ｄｓを割ることにより平均燃費ＦＣＣを求める。

In other words, the system controller 20 acquires the speed v and the acceleration dv / dt from the travel history, and substitutes the acquired speed v and acceleration dv / dt into the equation (3) to thereby calculate the fuel consumption amount fc per unit time. Ask for. The system controller 20 obtains the fuel consumption amount Fc by adding the obtained fuel consumption amount fc per unit time with respect to time, and obtains the average fuel consumption FCC by dividing the travel distance Ds by the obtained fuel consumption amount Fc. .

For example, when obtaining the average fuel consumption in the past, first, the system controller 20 first determines the interval from the ACC-ON time t0 at the start of use of the navigation device 1 to the ACC-OFF time t1 at the completion of the previous driving. The speed and acceleration (for example, every 3 seconds) are acquired from the travel history, and the amount of fuel consumption per fixed time is obtained by substituting each in equation (3). And the system controller 20 calculates | requires the fuel consumption from the time t0 to the time t1 by accumulating the calculated | required fuel consumption for every fixed time, as shown to Formula (2). Next, the system controller 20 acquires the travel distance from the time t0 to the time t1 from the travel history, and divides the travel distance by the fuel consumption amount from the time t0 to the time t1 previously obtained, thereby calculating the past average fuel efficiency. Ask for.

Similarly, in the case of obtaining the average fuel consumption this time, first, the system controller 20 obtains the speed and acceleration at regular intervals from the ACC-ON time t2 to the current time tp at the start of the current operation from the travel history, By substituting each into equation (3), the fuel consumption per fixed time is obtained. And the system controller 20 calculates | requires the fuel consumption from the time t2 to the time tp by accumulating the calculated | required fuel consumption for every fixed time, as shown to Formula (2).

Here, as described above, the system controller 20 updates the average fuel consumption this time at regular intervals. Therefore, in practice, the system controller 20 adds the fuel consumption from the previous update to the current time tp to the fuel consumption obtained at the update immediately before the current time tp, thereby starting from the time t2. The fuel consumption up to time tp is obtained. Then, the system controller 20 obtains the travel distance from time t2 to tp from the travel history, and obtains the current average fuel consumption by dividing the travel distance by the fuel consumption amount from time t2 to time tp previously obtained. .

In this way, the system controller 20 can obtain the past average fuel efficiency and the current average fuel efficiency.

As can be seen from the above description, the system controller 20 determines from the ACC-ON time at the start of use of the navigation device 1 to the ACC-OFF time at the completion of the previous driving, based on the traveling history of the vehicle. The past average fuel consumption and the current average fuel consumption from the ACC-ON time to the current time at the start of the current driving are obtained, the past average fuel consumption is compared with the current average fuel consumption, and the comparison result is displayed on the display 44. By doing in this way, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the entire current driving, in comparison with the past average fuel consumption.

Next, how to determine the ACC-OFF time at the completion of the previous operation and the ACC-ON time at the start of the current operation will be described with reference to FIG.

The system controller 20 basically regards the latest ACC-OFF time with respect to the current time as the ACC-OFF time at the completion of the previous operation, and determines the latest ACC-ON time with respect to the current time as the current time. It is considered as the ACC-ON time at the start of operation. As shown in FIG. 2, the system controller 20 regards the latest ACC-OFF time t1 with respect to the current time as the ACC-OFF time at the completion of the previous operation, and determines the latest ACC-ON time t2 with respect to the current time. Considering the ACC-ON time at the start of the current driving, it becomes possible to evaluate the fuel consumption up to the current time in the current driving. However, in reality, the driver may take a break during this driving. That is, the driver may stop the vehicle and take ACC-OFF to take a break. In this case, if the ACC-OFF time when the vehicle is stopped to take a break is regarded as the ACC-OFF time when the previous driving is completed, only fuel efficiency evaluation for driving after the break can be performed. Thus, it becomes difficult to evaluate the fuel consumption of the entire driving this time.

Therefore, in this embodiment, when the time from the ACC-OFF time to the ACC-ON time is less than the predetermined time, the system controller 20 determines that the driver is from the ACC-OFF time to the ACC-ON time. It shall be regarded as taking a break. Specifically, the system controller 20 does not regard the ACC-OFF time and the ACC-ON time as the ACC-OFF time at the completion of the previous operation and the ACC-ON time at the start of the current operation, respectively. I will do it. Here, the predetermined time is set by a driver or the like, and is set to be longer than the assumed break time.

For example, as shown in FIG. 4A, the system controller 20 has a case where the time from the latest ACC-OFF time t3 to the ACC-ON time t4 with respect to the current time is less than a predetermined time (for example, 60 minutes). Is considered to be taking a break from time t3 to time t4. That is, the system controller 20 does not regard the latest ACC-OFF time t3 and ACC-ON time t4 as the ACC-OFF time when the previous operation is completed and the ACC-ON time when the current operation is completed, respectively. To do. In this case, the system controller 20 obtains the average fuel consumption from the ACC-ON time t0 at the start of use of the navigation device 1 to the ACC-OFF time t1 at the completion of the previous driving as the past average fuel consumption, and starts the current driving. In this case, the average fuel consumption from the ACC-ON time t2 to the current time tp is obtained as the current average fuel consumption.

On the other hand, as shown in FIG. 4B, the system controller 20 determines that the time from the most recent ACC-OFF time t3 to the most recent ACC-ON time t4 is equal to or longer than a predetermined time (for example, 60 minutes). Is assumed that the operation has once ended at the latest ACC-OFF time t3, and the most recent ACC-OFF time t3 is regarded as the ACC-OFF time at the completion of the previous operation. That is, the system controller 20 sets the operation from the ACC-ON time t0 to the latest ACC-OFF time t3 at the start of use of the navigation device 1 as the previous operation, and the operation from the latest ACC-ON time t4 as the current operation. Driving. In this case, the system controller 20 obtains the average fuel consumption from the ACC-ON time t0 to the latest ACC-OFF time t3 when the navigation apparatus 1 starts to be used as the past average fuel consumption, and from the latest ACC-ON time t4 to the current The average fuel consumption up to time tp is obtained as the current average fuel consumption.

By doing in this way, even if the driver is taking ACC-OFF for a break, the rest time of the driver can be included in the current driving.

Next, a fuel consumption evaluation method when the fuel consumption information and sensor learning are initialized will be described with reference to FIG.

First, the case where the fuel consumption information is initialized will be described with reference to FIG. If the fuel efficiency information is initialized and there is no past average fuel efficiency data, it is not possible to evaluate the average fuel efficiency this time. In such a case, it is first necessary to obtain the past average fuel consumption.

Therefore, in such a case, the system controller 20 determines that the average fuel efficiency this time until the travel distance from the time when the fuel efficiency information is initialized to the ACC-OFF time when the previous operation is completed becomes larger than a predetermined distance. Evaluation of is not performed. Here, the predetermined distance is a travel distance for which an accurate average fuel efficiency can be calculated this time, and is set to, for example, 10 km in the example shown in FIG. At this time, the comparison result between the past average fuel efficiency and the current average fuel efficiency is not displayed on the display 44, but the evaluation of the current average fuel efficiency is performed as in the case of “average fuel consumption unknown” in “toll road” in FIG. It is displayed that it will not be performed.

As shown in FIG. 5A, the system controller 20 determines that the travel distance from the time ta0 when the fuel efficiency information is initialized to the ACC-OFF time ta1 when the previous driving is completed is longer than a predetermined distance (for example, 10 km). When it becomes larger, the average fuel consumption from time ta0 to time ta1 is obtained as the past average fuel consumption based on the travel history. As a result, the fuel efficiency can be evaluated from the ACC-ON time ta2 at the start of the current operation. The system controller 20 obtains the average fuel consumption from the ACC-ON time ta2 to the current time tp at the start of the current operation as the current average fuel consumption, and displays the comparison result between the past average fuel consumption and the current average fuel consumption on the display 44.

Thus, the average from the time ta0 to the time ta1 is started only when the travel distance from the time ta0 when the fuel efficiency information is initialized to the ACC-OFF time ta1 when the previous driving is completed becomes larger than the predetermined distance. By determining the fuel efficiency as the past average fuel efficiency, the accuracy of the past average fuel efficiency can be improved, and the accuracy of the evaluation of the current average fuel efficiency can be improved.

Even when the time from the ACC-OFF time ta1 to the ACC-ON time ta2 is less than a predetermined time (for example, 60 minutes), if the fuel consumption information is initialized, the ACC-OFF time The ta1 and ACC-ON time ta2 may be regarded as the ACC-OFF time at the completion of the previous operation and the ACC-ON time at the start of the current operation, respectively. By doing in this way, a past average fuel consumption can be calculated | required at an early stage, and it becomes possible to evaluate this time average fuel consumption early.

Next, a case where sensor learning is initialized will be described with reference to FIG. When the sensor learning of the sensor in the self-supporting positioning device 10 is initialized, the measurement value indicating the running state such as the acceleration cannot be obtained accurately. The average fuel consumption cannot be evaluated.

Therefore, in such a case, the system controller 20 does not obtain the average fuel efficiency this time until the sensor for which sensor learning has been initialized completes new sensor learning. In the example shown in FIG. 5B, the system controller 20 does not calculate the current average fuel consumption from the time tb0 when the sensor learning is initialized to the completion time tb1 of the new sensor learning. No evaluation will be performed. Also in this case, as described above, for example, the display 44 indicates that the average fuel consumption is not evaluated this time as in the display example of “average fuel consumption unknown” in “toll road” in FIG. It is.

Here, as a sensor learning method, it is conceivable to calibrate a value obtained from a signal detected from a sensor based on position information obtained from a signal from the GPS receiver 18. For example, when performing sensor learning of the acceleration sensor 11, the system controller 20 calibrates the acceleration obtained from the signal detected from the acceleration sensor 11 based on the position information obtained from the GPS receiver 18.

When the new sensor learning is completed, the system controller 20 obtains the average fuel consumption from the sensor learning completion time tb1 to the current time tp as the current average fuel consumption, and compares the past average fuel consumption before time tb0 with the current average fuel consumption. The result is displayed on the display 44. Thereby, since the accuracy of the measured value of the sensor indicating the running state such as acceleration can be increased, the accuracy of the current average fuel consumption can be increased, and the accuracy of the evaluation of the current average fuel consumption can be improved.

Next, control processing of the fuel consumption evaluation method of the present invention will be described using the flowchart of FIG. The flowchart shown in FIG. 6 shows the control processing of the system controller 20 from the ACC-ON time to the current time when the navigation device 1 starts to be used. In this flowchart, it is assumed that the driver does not take a break.

In step S101, when the navigation device 1 is installed in the vehicle and the power is turned on for the first time, that is, when the navigation device 1 is started to be used ACC-ON, the system controller 20 The travel distance for each fixed time obtained based on the detection signal is accumulated.

The fuel consumption information is initialized when the navigation device 1 is used. Therefore, in the subsequent step S102, the system controller 20 determines whether or not the cumulative travel distance is equal to or greater than a predetermined distance (for example, 10 km). If the system controller 20 determines that the cumulative travel distance is not greater than or equal to the predetermined distance, that is, less than the predetermined distance (step S102: No), the system controller 20 returns to the process of step S101. On the other hand, when the system controller 20 determines that the accumulated travel distance is equal to or greater than the predetermined distance (step S102: Yes), the system controller 20 proceeds to the process of step S103.

In step S103, it is assumed that the system controller 20 detects that ACC-ON is performed again after ACC-OFF. In step S104, the system controller 20 calculates the past average fuel consumption from the ACC-ON time at the start of use of the navigation device 1 to the ACC-OFF time detected in step S103. Thereby, in step S105, the system controller 20 can acquire the past average fuel consumption, and can evaluate the average fuel consumption this time. Thereafter, the system controller 20 proceeds to the process of step S106.

In step S106, the system controller 20 accumulates the travel distance and fuel consumption for each fixed time based on the travel history, and calculates the travel distance from the ACC-ON time to the current time detected in step S103. The fuel consumption is calculated and the average fuel consumption is calculated this time.

In step S107, the system controller 20 compares the past average fuel efficiency with the current average fuel efficiency. For example, the system controller 20 obtains the ratio of the difference between the current average fuel efficiency and the past average fuel efficiency to the past average fuel efficiency as a comparison result. In subsequent step S <b> 108, the system controller 20 displays the obtained comparison result on the display 44. Thereafter, the system controller 20 proceeds to the process of step S109.

In step S109, the system controller 20 determines whether or not ACC-OFF has been performed. If the system controller 20 determines that the ACC-OFF is not performed, the process returns to step S106. If the system controller 20 determines that the ACC-OFF is performed (step S109: Yes), the control process ends.

As described above, in the navigation device 1 according to the present embodiment, the system controller 20 includes the past average fuel consumption from the ACC-ON time at the start of use to the ACC-OFF time at the completion of the previous operation, and Then, the current average fuel consumption from the ACC-ON time to the current time at the start of the current driving is obtained, compared, and the comparison result is displayed on the display 44. By doing in this way, the driver can know the evaluation of the current average fuel consumption, which is the fuel consumption of the entire current driving, in comparison with the past average fuel consumption.

It should be noted that the present invention is not limited to the above-described embodiments, and can be changed as appropriate without departing from the scope or spirit of the invention that can be read from the claims and the entire specification. The apparatus is also included in the technical scope of the present invention. For example, in the above-described example, the fuel consumption display device of the present invention is applied to a navigation device, but the present invention is not limited to this. Instead of doing this, it goes without saying that the fuel consumption display device may be provided in the vehicle as a device different from the navigation device.

The present invention can be used in the field of car navigation devices.

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 10 Self-supporting positioning apparatus 20 System controller 30 Bus line 40 Display unit

Claims (7)

A fuel consumption display device for displaying an evaluation of fuel consumption of a vehicle,
Based on the running history of the vehicle, the average fuel consumption from the power-on time at the start of use of the fuel consumption display device to the power-off time at the completion of the previous driving is obtained as a past average fuel consumption, and Average fuel consumption calculation means for obtaining the average fuel consumption from the power-on time to the current time as the current average fuel consumption,
Average fuel consumption comparison means for comparing the past average fuel consumption and the current average fuel consumption;
A fuel consumption display device comprising: display means for displaying a comparison result between the current average fuel consumption and the past average fuel consumption. When the time from the power-off time to the power-on time of the fuel consumption display device is less than a predetermined time, the average fuel consumption calculation means sets the power-off time and the power-on time to the previous operation completion, respectively. 2. The fuel consumption display device according to claim 1, wherein the fuel consumption display device is not regarded as a power-off time at the time of starting and a power-on time at the start of the current operation. When the fuel consumption information is initialized, the average fuel consumption calculation means is configured such that the travel distance from the fuel efficiency information initialization time to the power-off time at the completion of the previous driving is greater than a predetermined distance. 3. The fuel consumption display device according to claim 1, wherein an average fuel consumption from an initialization time of the fuel consumption information to a power-off time at the completion of the previous operation is obtained as the past average fuel consumption. . When the fuel consumption information is initialized, the average fuel consumption calculation means is a case where the time from the power-off time to the power-on time of the fuel consumption display device is less than a predetermined time, The fuel consumption display device according to claim 3, wherein the power-off time and the power-on time are regarded as a power-off time when the previous operation is completed and a power-on time when the current operation is started, respectively. . When the sensor for detecting the running state of the vehicle is initialized, the average fuel consumption calculation means sets the average fuel consumption from the completion time of the new sensor learning of the sensor to the current time as the current average fuel consumption. The fuel consumption display device according to claim 1, wherein the fuel consumption display device is obtained. A fuel consumption display method for displaying an evaluation of fuel consumption of a vehicle by a fuel consumption display device,
Based on the running history of the vehicle, the average fuel consumption from the power-on time at the start of use of the fuel consumption display device to the power-off time at the completion of the previous driving is obtained as a past average fuel consumption, and An average fuel consumption calculation step for obtaining an average fuel consumption from the power-on time to the current time as an average fuel consumption this time,
An average fuel consumption comparison step of comparing the past average fuel consumption and the current average fuel consumption;
A fuel consumption display method comprising: a display step of displaying a comparison result between the current average fuel efficiency and the past average fuel efficiency. A fuel consumption display program executed by a fuel consumption display device for displaying an evaluation of fuel consumption of a vehicle,
Based on the running history of the vehicle, the average fuel consumption from the power-on time at the start of use of the fuel consumption display device to the power-off time at the completion of the previous driving is obtained as a past average fuel consumption, and Average fuel consumption calculation means for obtaining the average fuel consumption from the power-on time to the current time as the average fuel consumption this time,
Average fuel consumption comparison means for comparing the past average fuel consumption with the current average fuel consumption;
A fuel consumption display program for causing the fuel consumption display device to function as display means for displaying a comparison result between the current average fuel consumption and the past average fuel consumption.

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