WO2016047036A1

WO2016047036A1 - Vehicular navigation apparatus

Info

Publication number: WO2016047036A1
Application number: PCT/JP2015/004255
Authority: WO
Inventors: 貴巨長谷川; 貴雄國井
Original assignee: 株式会社デンソー
Priority date: 2014-09-26
Filing date: 2015-08-25
Publication date: 2016-03-31
Also published as: JP2016070679A

Abstract

This vehicular navigation apparatus (10) is provided with: a plurality of sensors (13, 14, 15) which detect information items used in order to execute a navigation function for guiding vehicle travel; a second microcomputer (11) which acquires the plurality of information items detected respectively by the sensors, and synchronizes and outputs the acquired plurality of information items; and a first microcomputer (21) which executes the navigation function on the basis of the synchronized plurality of information items outputted from the second microcomputer.

Description

Vehicle navigation device

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2014-196611 filed on September 26, 2014, the contents of which are incorporated herein by reference.

This disclosure relates to a vehicle navigation apparatus (Vehicular Navigation Apparatus) that performs vehicle travel guidance.

The vehicle navigation device detects the position and traveling direction of a vehicle by known dead reckoning navigation based on information items such as an angular velocity detected by a gyro sensor, a vehicle speed detected by a vehicle speed sensor, and an acceleration detected by an acceleration sensor. To do. Then, the vehicle mark corresponding to the detection result is displayed on the display device together with the road map, so that the vehicle is guided to the driving vehicle (see, for example, Patent Document 1).

JP 3218876 B2

In order to detect an accurate vehicle position and traveling direction, it is necessary to synchronize various information items obtained from a plurality of sensors as much as possible. In the conventional configuration, a plurality of sensors output information items to different microcomputers. Therefore, in order to synchronize various information items obtained from a plurality of sensors, it is necessary to perform a synchronization process between a plurality of microcomputers, which increases the load of the synchronization process.

An object of the present disclosure is to provide a vehicle navigation device that can synchronize information items used for executing a navigation function for performing vehicle travel guidance with a smaller processing load.

A vehicle navigation apparatus according to an example of the present disclosure is provided so as to include a plurality of sensors, a first microcomputer, and a second microcomputer. Each of the plurality of sensors detects an information item used for executing a navigation function for guiding the vehicle to travel. The second microcomputer acquires information items detected by the plurality of sensors, and outputs the acquired information items in synchronization. The first microcomputer performs a navigation function based on a plurality of synchronized information items output from the second microcomputer.

According to this configuration, various information items obtained from a plurality of sensors are acquired by one second microcomputer, and the plurality of information items are synchronized from the one second microcomputer and given to the first microcomputer. I made it. Therefore, as compared with the conventional technology that performs synchronization processing among a plurality of microcomputers, information items used for executing a navigation function for performing vehicle travel guidance can be synchronized with a smaller processing load.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
The figure which shows schematically the structural example of the navigation apparatus for vehicles which concerns on one Embodiment. Flow chart showing an operation example by the vehicle navigation device

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. A vehicle navigation apparatus 10 illustrated in FIG. 1 includes a second microcomputer 11 and a first microcomputer 21. Hereinafter, the vehicle navigation device 10 is simply referred to as a navigation device 10. The second microcomputer 11 is a dedicated microcomputer provided for the navigation device 10 and is mounted on the second substrate 12. The startup performance of the second microcomputer 11 is improved so that the second microcomputer 11 is started in a time shorter than at least the first microcomputer 21 when the accessory switch of the vehicle is turned on. The second microcomputer 11 is provided with a port 11a for acquiring detection information items obtained by various sensors. In this case, the port 11a is composed of an A / D port. Further, the second microcomputer 11 is provided with a communication port 11b for performing communication with each element mounted on the first substrate 22.

Information items such as an angular velocity detected by the gyro sensor 13, a vehicle speed detected by the vehicle speed sensor 14, and an acceleration detected by the acceleration sensor 15 are input to the second microcomputer 11 via the port 11a. It has become. In this case, the gyro sensor 13 and the acceleration sensor 15 are mounted on the second substrate 12.

The first microcomputer 21 is mounted on a first substrate 22 different from the second substrate 12. The first microcomputer 21 is not provided with a port for acquiring detection information items obtained by various sensors. That is, the first microcomputer 21 is a general-purpose microcomputer that does not include a port for acquiring information items from various sensors. The first microcomputer 21 is configured to be able to execute a navigation function for guiding the vehicle to the driving vehicle by executing a control program for performing well-known dead reckoning navigation. The first microcomputer 21 is provided with a communication port 12b for communicating with the second microcomputer 11.

In addition, a GPS module 23 and a connection abnormality detection sensor 24 are mounted on the first substrate 22. The GPS module 23 is an example of a position detection sensor, and detects the position of the vehicle based on radio waves received via an antenna 23a from a positioning satellite that constructs a positioning system (not shown). Then, the GPS module 23 outputs the detected position information item to the second microcomputer 11 via the communication line 31. The connection abnormality detection sensor 24 detects whether or not the antenna 23 a is normally connected to the GPS module 23. Then, the connection abnormality detection sensor 24 outputs information items indicating connection abnormality or normality to the second microcomputer 11 via the communication line 32.

The navigation device 10 further includes a communication line 33 and a communication line 34. The communication line 33 is a dedicated communication line for transmitting a plurality of information items synchronized by the second microcomputer 11 from the second microcomputer 11 to the first microcomputer 21 as will be described in detail later. As the communication line 33, for example, a UART cable (UART: UniversalUniversAsynchronous Receiver Transmitter) is employed. The communication line 34 is used for transmission / reception of various information items other than a plurality of information items synchronized by the second microcomputer 11. For example, a USB cable (USB: Universal Serial Bus) is employed as the communication line 34.

Next, an operation example of the navigation function executed by the navigation device 10 will be described. That is, as illustrated in FIG. 2, when the second microcomputer 11 receives an information item from

various sensors

13, 14, 15, and 23 (S 1: YES), the previous information to the first microcomputer 21 is received. It is confirmed whether or not a predetermined time has passed since the item transmission (S2). The second microcomputer 11 stores information items received from the

various sensors

13, 14, 15, and 23 within the predetermined period in a storage medium (not shown). Further, the predetermined time can be appropriately changed and set based on, for example, the accuracy of position information items and travel direction information items required for vehicle travel guidance.

When the predetermined time has elapsed (S2: YES), the second microcomputer 11 collects a plurality of information items acquired from the

various sensors

13, 14, 15, and 23 within the predetermined time. Then, the data is output to the first microcomputer 21 (S3). Thereby, the second microcomputer 11 synchronizes a plurality of information items acquired within a predetermined time and gives them to the first microcomputer 21. Further, the second microcomputer 11 periodically executes a process of synchronizing a plurality of information items to the first microcomputer 21. When the second microcomputer 11 transmits the information items in synchronization, the second microcomputer 11 starts counting the elapsed time thereafter (S4), and proceeds to S1.

On the other hand, when receiving a plurality of information items synchronized from the second microcomputer 11 (M1: YES), the first microcomputer 21 executes a known navigation function based on the information item group. That is, the first microcomputer 21 detects the position and traveling direction of the vehicle by a known dead reckoning navigation based on the received information item group. And the vehicle mark corresponding to the detection result is displayed on a display device (not shown) together with the road map.

According to the navigation device 10, various information items obtained from the plurality of

sensors

13, 14, 15, and 23 are directly obtained by one second microcomputer 11, and a plurality of information items are obtained from the one second microcomputer 11. The information items are synchronized and given to the first microcomputer 21. That is, a plurality of information items can be synchronized without performing synchronization processing between the plurality of

microcomputers

11 and 21, and the load of synchronization processing can be reduced.

Further, according to the navigation device 10, the dedicated communication line 33 for transmitting a plurality of information items synchronized by the second microcomputer 11 to the first microcomputer 21 is provided. Therefore, the synchronized information item can be reliably given to the first microcomputer 21.

Further, according to the navigation device 10, the second microcomputer 11 periodically transmits a plurality of synchronized information items to the first microcomputer 21. Therefore, the navigation function in the first microcomputer 21 can be executed accurately.

Further, according to the navigation device 10, the first microcomputer 21 is configured by a general-purpose microcomputer that can withstand a relatively high processing load. According to the navigation device 10, the navigation function is executed by the first microcomputer 21. That is, according to the navigation device 10, the navigation function with a relatively high processing load is executed by the first microcomputer 21, so that the navigation function can be executed without difficulty.

Note that, according to the navigation device 10, the GPS module 23 is mounted on the same first substrate 22 as the first microcomputer 21. However, the GPS module 23 may be mounted on the same second substrate 12 as the second microcomputer 11, or may be mounted on the same substrate as a microcomputer other than the second microcomputer 11 and the first microcomputer 21. .

The present disclosure is not limited to the above-described embodiments, and can be applied to various embodiments without departing from the gist thereof. For example, the sensor is not limited to the gyro sensor 13, the vehicle speed sensor 14, and the acceleration sensor 15 as long as it detects an information item used for realizing the navigation function of the vehicle.

Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A plurality of sensors (13, 14, 15, 23) for detecting information items used to execute a navigation function for performing vehicle travel guidance;
A second microcomputer (11) for acquiring a plurality of information items respectively detected by the sensors and outputting the acquired information items in synchronization;
A first microcomputer (21) for executing a navigation function based on a plurality of synchronized information items output from the second microcomputer;
A vehicle navigation apparatus comprising:
The vehicle navigation apparatus according to claim 1, further comprising a dedicated communication line (33) for transmitting the plurality of synchronized information items from the second microcomputer to the first microcomputer.
The vehicle navigation device according to claim 1, wherein the second microcomputer periodically transmits the synchronized information items to the first microcomputer.
The vehicle navigation apparatus according to any one of claims 1 to 3, wherein the first microcomputer is a general-purpose microcomputer that does not include a port that acquires a plurality of information items detected by the sensors.
As the sensor, at least a position detection sensor (23) for detecting the position of the vehicle is provided,
The vehicle navigation device according to any one of claims 1 to 4, wherein the position detection sensor is mounted on the same substrate (22) as the first microcomputer.