JP2005017072A - On-vehicle display equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a correct engine rotational number in an automobile instrument 100. <P>SOLUTION: The automobile instrument 100 is equipped with an electronic control device 10 for a meter for displaying on a display panel 20 based on rotational number data received from an electronic control device 30 for the engine through an on-vehicle LAN (local area network) 40, and a time required for starting waiting of the rotational number data is shorter than a time required for generating the rotational number data by the electronic control device 30 for the engine. The electronic control device 10 for the meter starts display of the engine rotational number by the display panel 20 based on display data received after a prescribed period after start. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle display device that performs display based on display data received from an in-vehicle communication device through an in-vehicle LAN.
[0002]
[Background Art and Problems to be Solved by the Invention]
2. Description of the Related Art Conventionally, some automotive meters display engine speed on a display device such as a pointer device or a display panel.
[0003]
Here, the present inventor obtains rotational speed data indicating the engine rotational speed from the engine electronic control device through the in-vehicle LAN, and displays the engine rotational speed on the display based on the acquired rotational speed data. The instrument was examined.
[0004]
According to this study, the time required to start waiting for the rotational speed data by the electronic meter control device of the meter for an automobile is greater than the time required to generate the rotational speed data by the electronic control device for the engine. I found out that it might be shorter.
[0005]
Therefore, although the ignition switch is turned on and the meter electronic control device and the engine electronic control device are activated, the meter electronic control device is rotated before the engine electronic control device completes the generation of the rotational speed data. It will start waiting for several data. Along with this, there is a problem that immediately after startup, the meter electronic control device receives erroneous data as engine speed data from the engine electronic control device and causes the display device to display incorrect data as engine speed data. I understood.
[0006]
In view of the above, an object of the present invention is to display correct data in an in-vehicle display device that performs display based on display data received from an in-vehicle communication device through an in-vehicle LAN.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in the invention described in claim 1, the display (20) and the display data received from the in-vehicle communication device (30) through the in-vehicle LAN (40) Display control means (10) to be displayed on the display, and after starting, it takes more time to start waiting for the display data than the time required to generate display data by the in-vehicle communication device It is an in-vehicle display device whose time is shorter, wherein the display control means starts display by the display based on display data received after a predetermined period after the activation.
[0008]
As a result, the display is performed using only the display data received after a predetermined period after activation, so that correct data can be displayed.
[0009]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with specific means described in an embodiment described later.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an electrical schematic configuration of an automotive instrument 100 according to an embodiment of the present invention. FIG. 1 is a block diagram showing a schematic electrical configuration of the automotive instrument 100.
[0011]
As shown in FIG. 1, the automotive instrument 100 includes a meter electronic control unit (meter ECU) 10 and a display panel 20. The meter electronic control device 10 includes a microcomputer and a memory, and communicates with the engine electronic control device 30 through the in-vehicle LAN 40 and performs processing for displaying on the display panel 20.
[0012]
Here, the engine electronic control unit 30 generates rotation number data indicating the engine rotation number based on the detection output from the sensor 50 that detects the engine rotation number, and outputs the rotation number data to the meter electronic control unit 10 through the in-vehicle LAN 40. To do. In addition, as a system of the in-vehicle LAN 40, for example, a CAN (Controller Area Network) is used.
[0013]
In addition, for example, a liquid crystal display panel is used as the display panel 20, and this liquid crystal display panel is disposed toward the rear of the vehicle in an instrument panel in the vehicle interior.
[0014]
Next, the operation of this embodiment will be described with reference to FIGS.
[0015]
FIG. 2 is a flowchart showing the processing of the meter electronic control device 10. 3A is a timing chart showing the state of the ignition switch IG, FIG. 3B is a timing chart showing the state of the engine speed data, and FIG. 3C is a diagram of the electronic control device 10 for the meter. It is a timing chart which shows an operation state.
[0016]
First, when the passenger turns on the ignition switch IG (see FIG. 3A), the ignition switch IG sends an activation signal to the meter electronic control device 10 and the engine electronic control based on the electric power supplied from the in-vehicle battery Ba. Output to device 30.
[0017]
Along with this, the engine electronic control device 30 is activated and starts generating the rotation speed data indicating the engine rotation speed. Here, it takes a certain time T (indicated as data establishment time in FIG. 3) for the engine electronic control device 30 to generate and transmit the correct rotation speed data.
[0018]
For this reason, the engine electronic control unit 30 may output invalid data to the meter electronic control unit 10 through the in-vehicle LAN 40 as a rotational speed data until a predetermined time T has elapsed after activation (FIG. 3). (See (b)). On the other hand, the meter electronic control device 10 of the present embodiment performs display processing as follows to display the correct engine speed.
[0019]
Specifically, the meter electronic control device 10 is activated when it receives the activation signal output from the ignition switch IG, and starts executing the computer program stored in the memory according to the flowchart shown in FIG.
[0020]
First, standby processing is started (S100), and then it is determined whether or not rotation speed data is received from the engine electronic control unit 30 through the in-vehicle LAN 40 (S110).
[0021]
Here, when it is determined that the rotation speed data has been received from the engine electronic control unit 30 and YES is determined, it is determined whether or not a predetermined period Td has elapsed after the start (S120). As the predetermined period Td (≧ T), a time longer than the predetermined time T is determined in advance.
[0022]
Then, in the process of S120, when it is determined as YES because the predetermined period Td has elapsed after the activation, the process proceeds to the process of S130, and the display of the engine speed on the display panel 20 is performed based on the received speed data. Is started (see FIG. 3C). If it is determined in step S120 that the predetermined period Td has not elapsed since the start-up, the display panel 20 does not display the engine speed.
[0023]
Next, the effect of this embodiment is demonstrated. That is, the display panel 20 and the meter electronic control device 10 to be displayed on the display panel 20 based on the rotational speed data (display data) received from the engine electronic control device 30 through the vehicle-mounted LAN 40 are provided. An electronic instrument 100 for a vehicle in which the time required to start waiting for the rotational speed data is shorter than the time required to generate the rotational speed data by the control device 30. Based on the display data received after a predetermined period after activation, display of the engine speed on the display panel 20 is started.
[0024]
As a result, the engine speed is displayed using only the rotation speed data received after a predetermined period after startup, so that the correct engine speed can be displayed.
[0025]
(Other embodiments)
In the above-described embodiment, an example in which a display panel such as a liquid crystal display panel is used as the display has been described.
[0026]
In the above-described embodiment, an example in which an engine electronic control device is used as an in-vehicle communication device has been shown. An apparatus may be used.
[0027]
In the above-described embodiment, an example in which the meter electronic control device is used as the display control means has been described. An apparatus may be used.
[0028]
In the above-described embodiment, the rotational speed data indicating the engine rotational speed is shown as the display data. However, the present invention is not limited to this, and various data such as data indicating the remaining amount of fuel in the traveling fuel tank and data indicating the vehicle speed are provided. Data may be used.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic electrical configuration of an automotive instrument according to an embodiment of the present invention.
FIG. 2 is a flowchart showing processing of the meter electronic control device of FIG. 1;
FIG. 3 is a timing chart for explaining the operation of the automotive instrument of the embodiment.
[Explanation of symbols]
10 ... Electronic control device for meter, 20 ... Display panel,
30 ... Electronic control unit for engine, 50 ... Sensor 40 ... In-vehicle LAN.

Claims (1)

An indicator (20);
Display control means (10) for displaying on the display unit based on display data received from the in-vehicle communication device (30) through the in-vehicle LAN (40), and display data by the in-vehicle communication device after activation. Is a vehicle-mounted display device in which the time required to start waiting for the display data is shorter than the time required to generate
The vehicle-mounted display device, wherein the display control means starts display by the display based on display data received after a predetermined period after the activation.

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