JP7666407B2 - In-vehicle display device - Google Patents

Description

The present invention relates to an in-vehicle display device.

Patent Document 1 discloses an in-vehicle display device that displays on a display unit the minimum distance that is estimated to be possible with the remaining amount of power when the power load on the battery provided by an auxiliary device capable of receiving battery power is maximized within a variable range according to operational input, and the maximum distance that is estimated to be possible with the remaining amount of power when the power load is minimized within a variable range according to operational input.

JP 2015-042049 A

However, the in-vehicle display device disclosed in Patent Document 1 consumes power from the auxiliary battery when displaying the remaining driving distance, so there is a risk that the vehicle will be unable to drive if a sudden voltage drop (power consumption) occurs in the auxiliary battery.

The present invention has been made in consideration of the above, and its purpose is to provide an in-vehicle display device that can contribute to improving safety when the vehicle becomes unable to drive.

In order to solve the above problems and achieve the objectives, the in-vehicle display device of the present invention is an in-vehicle display device equipped with a display unit and a control device, and the control device is characterized in that, in the event of a failure that makes it impossible to supply power to an auxiliary battery mounted on the vehicle, the control device calculates the vehicle's remaining driving distance and displays it on the display unit, and, when an operation that increases the auxiliary current consumption is detected, the control device displays information on the display unit encouraging the user to stop the vehicle in a safe place.

The in-vehicle display device according to the present invention has the effect of contributing to improved safety when the vehicle becomes unable to drive.

FIG. 1 is a block diagram showing a main configuration of an in-vehicle display device according to an embodiment. FIG. 2 is a flowchart showing an example of failure mode control that is performed by the control device when a failure occurs that makes it impossible to supply power to the auxiliary battery.

The following describes an embodiment of the in-vehicle display device according to the present invention. Note that the present invention is not limited to this embodiment.

Figure 1 is a block diagram showing the main configuration of an in-vehicle display device 1 according to an embodiment. As shown in Figure 1, the in-vehicle display device 1 according to the embodiment includes a display unit 2 and a control device 3, and is mounted on a vehicle. The display unit 2 is, for example, a display for a digital meter mounted on the dashboard of the vehicle or a display for a car navigation system, and is one of the auxiliaries that receives power from an auxiliary battery mounted on the vehicle.

When a failure occurs that makes it impossible to supply power to the auxiliary battery mounted on the vehicle, the control device 3 displays on the display unit 2 at least the remaining drivable distance corresponding to the voltage drop of the auxiliary battery. For example, when a power supply device (e.g., a DC/DC converter, etc.) to the auxiliary battery fails, the control device 3 calculates the remaining drivable distance of the vehicle from the vehicle speed at the time of the failure and the slope of a graph showing the voltage drop of the auxiliary battery based on the measurement result of the auxiliary battery voltage by the auxiliary battery voltage measurement device 4 mounted on the vehicle. In other words, the control device 3 calculates the drivable distance that the vehicle can travel within the time during which the remaining power of the auxiliary battery can be supplied to the auxiliary equipment, etc., if the vehicle speed at the time of the failure is maintained. The control device 3 then causes the display unit 2 to display the calculated drivable distance.

The control device 3 can also detect operations that increase the auxiliary current consumption based on the auxiliary current consumption measured or predicted by the auxiliary current consumption measurement/prediction device 5 mounted on the vehicle. Operations that increase the auxiliary current consumption detected by the auxiliary current consumption measurement/prediction device 5 include, for example, foot brake operation (exceeding a threshold for the integrated value of the foot brake operation amount) and steering operation (exceeding a threshold for the integrated value of the steering angle) that use power stored in the auxiliary battery.

The control device 3 detects an operation that increases the auxiliary current consumption during the failure, and if it determines that an operation that predicts a sudden voltage drop (power consumption) in the auxiliary battery has been performed, it displays information on the display unit 2 urging the vehicle occupants to stop the vehicle in a safe place, and warns the vehicle occupants to stop the vehicle in a safe place.

Figure 2 is a flowchart showing an example of failure mode control performed by the control device 3 in the event of a failure that makes it impossible to supply power to the auxiliary battery.

First, the control device 3 judges whether or not the power supply device to the auxiliary battery has failed based on the detection results of various sensors mounted on the vehicle (step S1). If the control device 3 judges that the power supply device to the auxiliary battery has not failed (No in step S1), the control device 3 ends the series of controls. On the other hand, if the control device 3 judges that the power supply device to the auxiliary battery has failed (Yes in step S1), the control device 3 calculates the remaining drivable distance of the vehicle from the vehicle speed at the time of the failure and the slope of the graph showing the voltage drop of the auxiliary battery and displays it on the display unit 2 (step S2). Next, the control device 3 judges whether or not an operation that increases the auxiliary current consumption has been detected based on the auxiliary current consumption measured or predicted by the auxiliary current consumption measurement/prediction device 5 mounted on the vehicle (step S3). If the control device 3 judges that an operation that increases the auxiliary current consumption has not been detected (No in step S3), the control device 3 ends the series of controls. On the other hand, if the control device 3 detects an operation that increases the auxiliary current consumption (Yes in step S3), it causes the display unit 2 to display information that prompts the vehicle occupants to stop the vehicle in a safe place (step S4). After that, the control device 3 ends the series of controls.

When an operation that increases auxiliary current consumption is detected, the in-vehicle display device 1 according to the embodiment can warn the vehicle occupants to stop the vehicle in a safe place, thereby contributing to improving safety when the vehicle suddenly becomes unable to run due to a sudden voltage drop (power consumption) of the auxiliary battery.

1. In-vehicle display device, 2. Display unit, 3. Control device, 4. Auxiliary battery voltage measuring device, 5. Auxiliary current consumption measuring and prediction device.

Claims (1)

An in-vehicle display device including a display unit and a control device,
The control device includes:
In the event of a breakdown that makes it impossible to supply power to the auxiliary battery installed in the vehicle,
calculating a travelable distance of the vehicle and displaying the calculated distance on the display unit, and when detecting an operation that increases an auxiliary current consumption, displaying information on the display unit that prompts the user to stop the vehicle in a safe place;
1. An in-vehicle display device comprising:

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