In-vehicle display device

Abstract

To provide an on-vehicle display device which can contribute to improvement of safety when a vehicle cannot travel.SOLUTION: An on-vehicle display device includes a display part and a control device, wherein the control device calculates a travel possible distance of the vehicle and displays the travel possible distance on the display part, when power supply to an auxiliary machine battery mounted on the vehicle becomes impossible, and displays information promoting stopping in a safe place on the display part, when detecting operation of increasing auxiliary machine consumption current.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an in-vehicle display device. [Background technology]

[0002] Patent document 1 discloses an in-vehicle display device that displays on a display unit the minimum driving distance estimated to be possible with the remaining amount of power when the power load placed on the battery by an auxiliary device capable of receiving battery power is set to the maximum within a variable range according to operational input, and the maximum driving distance estimated to be possible with the remaining amount of power when the power load is set to the minimum within a variable range according to operational input. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-042049 A Summary of the Invention [Problem to be solved by the invention]

[0004] 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.

[0005] The present invention has been made in view of the above, and an object of the present invention is to provide an in-vehicle display device that can contribute to improving safety when the vehicle becomes unable to run. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the in-vehicle display device of the present invention is an in-vehicle display device equipped with a display unit and a control unit, and is characterized in that in the event of a failure that makes it impossible to supply power to the auxiliary battery installed in the vehicle, the control unit calculates the vehicle's possible driving distance and displays it on the display unit, and when an operation that increases the auxiliary current consumption is detected, the control unit displays information on the display unit encouraging the driver to stop in a safe place. Effect of the Invention

[0007] The in-vehicle display device according to the present invention has an effect of contributing to improvement of safety when the vehicle becomes unable to run. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a configuration of a main part of an in-vehicle display device according to an embodiment. [Diagram 2] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an in-vehicle display device according to the present invention will be described below, however, the present invention is not limited to the embodiment.

[0010] Fig. 1 is a block diagram showing a main configuration of an in-vehicle display device 1 according to an embodiment. As shown in Fig. 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 to which power is supplied from an auxiliary battery mounted on the vehicle.

[0011] 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 indicating the voltage drop of the auxiliary battery based on the measurement result of the voltage of the auxiliary battery 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. Then, the control device 3 causes the display unit 2 to display the calculated drivable distance.

[0012] Furthermore, the control device 3 can detect an operation that increases the auxiliary current consumption, based on the auxiliary current consumption measured or predicted by the auxiliary current consumption measuring and predicting device 5 mounted on the vehicle. Note that the operations that increase the auxiliary current consumption detected by the auxiliary current consumption measuring and predicting device 5 include, for example, a foot brake operation (exceeding a threshold for the integrated value of the foot brake operation amount) and a steering operation (exceeding a threshold for the integrated value of the steering angle) that use power stored in the auxiliary battery.

[0013] Then, during the failure, the control device 3 detects an operation that increases the auxiliary battery consumption current, and if it determines that an operation has been performed that predicts a sudden voltage drop (power consumption) in the auxiliary battery, 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.

[0014] FIG. 2 is a flowchart showing an example of failure mode control that is performed by the control device 3 in the event of a failure that makes it impossible to supply power to the auxiliary battery.

[0015] 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). When 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, when 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 measuring / predicting device 5 mounted on the vehicle (step S3). When 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, when the control device 3 detects an operation that increases the auxiliary current consumption (Yes in step S3), the control device 3 causes the display unit 2 to display information that prompts the passengers of the vehicle to stop the vehicle in a safe place (step S4). After that, the control device 3 ends the series of controls.

[0016] The in-vehicle display device 1 of the embodiment can warn vehicle occupants to stop the vehicle in a safe place when it detects an operation that increases auxiliary current consumption, thereby contributing to improving safety when the vehicle suddenly becomes unable to run due to a sudden drop in auxiliary battery voltage (power consumption). [Explanation of symbols]

[0017] 1 In-vehicle display device, 2 Display unit, 3 Control device, 4 Auxiliary battery voltage measuring device, 5 Auxiliary current consumption measuring / predicting device.

Claims

[Claim 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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