By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors SHIBATA, Minoru (Kariya-city, JP); MATSUOKA, Hiromichi (Kariya-city, JP), filed on August 7, 2014, was made available online on August 11, 2016.
The assignee for this patent application is Denso Corporation.
Reporters obtained the following quote from the background information supplied by the inventors: "An onboard apparatus that includes a navigation function to provide route guidance to a destination point or an audio function to reproduce video or music has been known. This type of onboard apparatus includes the USB (Universal Serial Bus) interface as a connection interface that connects with an external device (referring Patent literature 1, for example).
"In general, the external device to be connected through the USB interface uses a signal to indicate whether or not communication is available. The external device starts data transmission and reception through a bus when confirming that the onboard apparatus is capable of communication.
"The inventors of the present application have found the following. When the power supply is turned on, a microcomputer included in an onboard instrument may cause an instable signal level at an output terminal. This instable state may change the signal level at a terminal to transmit and receive data before a communication availability signal (a signal that indicate the communication availability) reaches a signal level to confirm that the communication is available. In such a case, the external device may determine to be a communication error, lock the communication through the USB interface, and disable the communication."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "It is an object of the present disclosure to improve operation reliability at the time an external device is connected.
"According to one aspect of the present disclosure, an onboard apparatus comprising: a connection portion that connects with an external device mounted to a vehicle, and includes at least a data terminal to input and output a communication data and a control terminal to output a communication availability signal that indicates communication is available or not; a control block that performs data communication with the external device, which is connected to the connection portion is provided.
"A permission signal is a signal whose signal level varies when an output of the control block is stabilized after the onboard apparatus starts. The onboard apparatus includes a bus switch that, according to the permission signal, changes a non-conduction state to a conduction state of a transmission path from the control block to the data terminal.
"According one aspect of the present disclosure, an onboard communication system including the onboard apparatus and an external device connected to the connection portion is provided. When the communication availability signal is set to a signal level indicating that communication is unavailable, and when the external device detects a signal level change in the communication data, the external device determines as an error and disables communication.
"According to the onboard apparatus and the onboard communication system, the bus switch disconnects the data terminal from the control block (to enable the non-conduction state). It is supposed that an output from the control block varies after the control block starts up and before the communication availability signal changes to the signal level indicating that the communication is available. Thus, it may be possible to prevent the effect from being transmitted to the outside through the data terminal. It may be possible to prevent the external device from detecting a communication error due to an unstable output from the control block. Therefore, it may be possible to improve operation reliability when the external device is connected.
BRIEF DESCRIPTION OF DRAWINGS
"The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
"FIG. 1 is a block diagram illustrating an overall configuration of an onboard communication system;
"FIG. 2 is a timing chart illustrating an operation of a navigation controller; and
"FIG. 3 is a block diagram illustrating a modification of the navigation controller."
For more information, see this patent application: SHIBATA, Minoru; MATSUOKA, Hiromichi. Onboard Apparatus, and Onboard Communication System. Filed August 7, 2014 and posted August 11, 2016. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3195&p=64&f=G&l=50&d=PG01&S1=20160804.PD.&OS=PD/20160804&RS=PD/20160804
Keywords for this news article include: Electronics, Data Terminal, Denso Corporation.
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