Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Alpine Electronics, Inc.

Mobilemedia Brain Association, Inc.

Masayuki Arai

Koji Sengoku

Aiko Sugawara

Yoshitaka Kinoshita

Hitoshi Konishi

Minoru Sekine

Masakuni Tsuge

Takeshi Imai

Tadafumi Nogawa

Masaaki Ohira

Yuji Yokota

Toshihide Yofu

Keigo Andoh

Kohei Otsuki

Keisuke Urushihara

Masahiro Ohomori

Tetsuya Kawakami

Hirofumi Otsuka

Takashi Wakasugi

An electric motor control system includes an inverter, an element temperature observation data acquiring device, a rotational speed upper limit setting device, and a rotational speed limiter. The inverter includes switching elements. The element temperature observation data acquiring device is configured to acquire element temperature observation data indicating an observation value of a temperature of the switching elements of the inverter. The rotational speed upper limit setting device is configured to set a rotational speed upper limit of an electric motor in accordance with the observation value of the temperature of the switching elements so as to satisfy a first condition that a voltage applicable to the switching elements in a case where the electric motor is operated at the rotational speed upper limit is lower than or equal to a withstand voltage of the switching elements.

Electric motor control system

A navigation device for setting an appropriate navigation route based on a support route while reducing an amount of communicating information, is provided. The navigation server recognizes a departure position and a destination position of a user, and sets a support route connecting the departure position and the destination position, based on communication with the navigation device. The navigation device recognizes multiple links constituting a part of the support route, based on communication with the navigation server. The navigation device sets a navigation route including the links connecting the departure position and the destination position. The navigation device determines whether a deviation between a distance of an adjacent link pairs among the links along the support route and a distance thereof along the navigation route is equal to or less than a threshold value. The navigation route is output via an output device if the determination result is positive.

Navigation device and navigation system

A map data update method for updating nationwide updated version map data using route-specific update data is disclosed. This method has a step of creating route-specific update data, comprising update data for all routes which have been newly opened since the time of release of the nationwide updated version map data; a step of storing a plurality of route-specific update data sets with different creation dates; a step of, when updating the nationwide updated version map data of the time of release stored in a navigation apparatus in use of a prescribed first route-specific update data which has been stored, storing pre-update map files necessary to restore the nationwide updated version map data; and a step of using the first route-specific update data to update the nationwide updated version map data.

Map data update method and map data update system

A navigation device and the like capable of appropriately alleviating an amount of communicating information between the navigation server and a navigation device, from the viewpoint of guiding a user to a destination point via the navigation device, on the basis of a support route which is set by the navigation server. Of the links constituting a support route R which connects the current position pand the destination position pof the user, the links satisfying an extraction condition set according to a changing pattern of a road type are extracted as target links. Also, the target links, that is, the link having high necessity from the viewpoint of guiding the user, with regard to the changing pattern of the road type, is recognized by the navigation deviceon the basis of communication between the navigation serverand the navigation device

Navigation server and navigation system

A navigation device and the like capable of harmonizing a navigation route for guiding a mobile body set on the basis of a support route search result by a navigation server and a navigation route for also guiding the mobile body set independently of the navigation route, from a view point of guiding the mobile body smoothly. In the case where the second navigation route ris set in the condition where the first navigation route ris set, the second navigation route ris set and output so as to include a part drof the first navigation route rwhich takes a position departing from the current position pof the automobileby a first distance d. Therefore, even in the case where the second navigation route ris set and output at the navigation deviceduring the time when the automobileis traveling according to the first navigation route routput at the navigation device, it is possible to guide the automobileaccording to the original first navigation route runtil the position departing from the current position pof the automobileby the first distance d. Therefore, it becomes possible to guide the automobilesmoothly to the destination position p, without forcing the automobileto perform abrupt behavior change.

A navigation server and the like capable of making a navigation deviceoutput a route having adequacy in view of various circumstances is provided. A navigation serverrecognizes a navigation route r(k) for guiding the automobileto the destination position pwhich is set according to the first algorithm by the navigation device. Further, a support route R(k) for guiding the automobilefrom a current position (or a departure position) pto the destination position pwhich is set according to the first algorithm is recognized. Still further, a first index c(k) representing an adequacy of the navigation route r(k) in view of the second algorithm is evaluated. On condition that the first index c(k) satisfies a predetermined condition, the support route R(k) is output in place of the navigation route r(k) by the navigation device

Navigation system

A navigation apparatus is disclosed comprising update functions to update nationwide updated version map data using route-specific update data, and to update the nationwide updated version map data to the next nationwide updated version map data using nationwide update data. A map update processing portion of this navigation apparatus performs updates of map data in the background of navigation control, gives priority to update processing using the route-specific update data over update processing using the nationwide update data, and, if map files to be updated using route-specific update files included in the route-specific update data have not been updated using the nationwide update data, performs updates using the nationwide update data, and then performs updates using route-specific update files.

Map data update method and navigation apparatus

An on-board vehicle navigation apparatus which gives road directions to a driver which accurately describe the road conditions beyond an intersection at which to turn, without causing any confusion even if the route is complicated. A route planning section 9 determines a route based on the current position of the vehicle which is obtained through a current position determination section 2 and a destination assigned by a destination assignment section 10. The guide intersections which form this route are stored in a guide intersection memory 11. A route guidance section 12 continually monitors the current position of the vehicle and announces navigational instructions through a speaker 13 when the vehicle approaches a guide intersection. The type of navigational instruction is changed depending on the distance between the next two guide intersections through which the vehicle will pass.

On-board vehicle navigation apparatus

A map information regenerating device usable in a vehicle travel guiding apparatus, which device is capable of freely revising a road map, i.e., adding, changing and deleting a road on the road map without changing data stored in a basic map-information storage but correlating change data with existing roads to assure the possibility of performing map-data processing such as course searching according to the revised map data. The device is so constructed that the map information may be read-out from a map information storage and stored in a buffer memory wherein the data is revised in a specified procedure according to the map change data read-out from an additionally used storage medium or/and obtained by using transmitting/receiving means.

Growing community of inventors

Wako, Japan

Masayuki Arai