JPS6246810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a travel route display device for displaying the travel status of a moving object such as an automobile, such as the current position, travel trajectory, and direction of travel.

In general, when driving at night or in unfamiliar areas, a road map is installed in the driver's seat in advance to provide appropriate guidance so that the driver does not deviate from the planned course and get lost. A device has been developed that displays information such as the current location.

Conventionally, in this type of travel route display device,
A distance detector detects the traveling distance of the vehicle according to the vehicle speed, and a rate-type direction detector that detects the angular velocity of change in the yaw direction detects the direction and the amount of change in the direction of travel of the vehicle. The current position of the vehicle on the travel route is calculated from the detected value, and the result is displayed on the road map as point information that changes every moment.

In this case, it is conceivable to use a gas rate sensor as a direction detector, which is more resistant to vibration than a gyroscope, has good sensitivity, and is rich in velocity characteristics, but it is difficult to detect gas flow caused by the direction change of a moving object. Since the angular velocity at that time is detected based on the slight difference in the amount of heat sensitive by the flow sensor in response to changes in Therefore, it is disadvantageous to use it as is in a car or the like.

The present invention has been made with these points in mind.The gas rate sensor is installed in a constant temperature control tank heated by a heater so that it is not affected by external temperature changes, and the gas rate sensor is kept at a constant temperature. The present invention provides a travel route display device capable of detecting the occurrence of abnormal drift in a control tank and displaying an alarm to that effect.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the travel route display device according to the present invention is housed in a constant temperature control tank 1 heated by a heater, and is equipped with a gas gas that outputs a signal proportional to the direction or the amount of change in direction depending on the direction of travel of the vehicle. A rate sensor 2, a distance sensor 3 that generates a signal according to the distance traveled by the car, and a calculation to calculate the position on the two-dimensional coordinates of the car for each unit distance traveled according to the output of each of these sensors. The data on the two-dimensional coordinates that change every moment is stored as finite continuous position information corresponding to the driving route of the car, and the signal processing device CPU4 performs centralized control of the entire device, and its processing output Accordingly, a display device 5 updates the travel trajectory, current traveling direction, travel distance, required time, etc. in a certain section up to the current position of the vehicle every moment, and a display command is given to display the display format (device conversion of the travel trajectory) on the display device 5. , display scale rate, etc.) and adjust the output sensitivity of the gas rate sensor 2 as appropriate.The operation switch panel 6 consists of a digital code switch that can change the settings (display scale, etc.) and adjust the output sensitivity of the gas rate sensor 2 as appropriate. connected through its ignition switch IG
A power supply circuit 7 controls the energization of the heater of the constant temperature control tank 1 in conjunction with the opening and closing of the SW, and transmits the operation contents of the operation switch board 6 as an encoded signal to the signal processing device 4. It is composed of an operation switch encoder and an energization control device 8 for controlling energization.

The operation of the travel route display device according to the present invention configured as described above will be explained below.

First, when the car is running, a display command is given in advance via the operation switch panel 6, and a display device 5 corresponding to a road map used for guidance.
The starting point and the display scale are set as appropriate. After that, when the car starts running, one pulse signal is sent from the distance sensor 3 to the signal processing device 4 for each unit distance traveled.
By counting the number of pulses, the traveling distance is measured, and the output of the gas rate sensor 2 is also sent to the signal processing device 4, where the direction in which the vehicle is traveling at each moment is determined. In addition, at this time, the battery power supply E is connected to the constant temperature control tank 1 through the power supply circuit 7, and its internal temperature is kept constant, so that the gas rate sensor 2 is not affected by changes in the external temperature. It becomes possible to perform stable and accurate angular velocity detection. The signal processing device 4 calculates the current position x, y on the X-Y coordinates according to a preset scaling factor based on the travel distance and direction change of the vehicle detected as described above.
is computed moment by moment, and the computed results are sequentially stored and retained. Note that the stored contents are constantly read out and continuously sent to the display device 5. At the same time, a direction signal at the current position is sequentially sent from the signal processing device 4 to the display device 5. As shown in FIG. 2, the display device 5 includes a directional display mark M1 for the current position B and a mark M2 for displaying the travel trajectory from the starting point A to the current position B.
will be simulated to follow the driving conditions of the vehicle. In addition, as shown in FIG. 2, the display device 5 also displays a display D1 of the travel time required to reach the current position B (this is a signal processing device 4), a timer that operates only while driving may be incorporated in D2, which also displays the total distance traveled up to that point,
Alternatively, an auxiliary display such as a display D3 of the scale factor set by the operation switch board 6 is made as appropriate.

In this way, by comparing the travel trajectory up to the current location displayed on the display device 5 with the road shape on the map, the driver can easily determine which road the vehicle is traveling on. becomes possible.

Also, when the ignition switch IG/SW is turned off for temporary parking such as refueling while driving, this is detected by the power supply circuit 7, and the power supply circuit 7 is turned off for a preset period of time. The heater of the constant temperature control tank 1 is continuously energized to maintain the temperature inside the constant temperature control tank 1 constant, and an alarm such as a buzzer is operated to notify the user of this fact.

Therefore, when the vehicle is restarted to run again within the certain period of time, the accurate driving route can be immediately and continuously displayed without requiring a waiting time until the temperature in the constant temperature control tank 1 becomes stable. You will be able to do this. In addition, in this case, the alarm is activated to allow the driver to confirm acceptance of the heater being energized, thereby preventing unnecessary power consumption due to forgetting to turn off the main switch of the driving route display device. become.

In such a travel route display device, especially in the present invention, the presence or absence of abnormal temperature in the constant temperature control tank 1 housing the gas rate sensor 2 is detected.
The signal processing device 4 periodically checks the offset output of the gas rate sensor 2 when the vehicle is stopped to detect it, and when an abnormal temperature occurs, the display device 5 displays a warning to that effect to alert the driver. The feature is that it can be notified.

In other words, the offset output of the gas rate sensor 2 is always a constant reference value when the vehicle is stopped when the temperature inside the constant temperature control tank 1 is maintained constant, but if the internal temperature rises abnormally or When descending, the gas rate sensor 2 at that time
The offset output of the gas rate sensor 2 changes to more than or less than the normal reference value, and each time the vehicle is stopped, the signal processing device 4 reads and stores the offset output of the gas rate sensor 2 at that time. From the content, the following equation is calculated using the offset output V (t ₂ ) at the current vehicle stop time t ₂ and the offset output V (t ₁ ) at the immediately preceding stop time t ₁ , and as a result, S is set in advance. If the temperature exceeds the value K, it is assumed that an abnormal temperature has occurred, and an alarm signal is sent to the display device 5, and an abnormal temperature occurrence mark AM (see Figure 2) is displayed on the display screen to notify the driver. have them do it.

S=|V( _t2 )-V( _t1 )|/T...(1) However, T= _t2 - _t1 .

As described above, in the travel route display device according to the present invention, the constant temperature control tank 1 maintains the gas rate sensor 2, which is sensitive to temperature changes, at a constant ambient temperature.
The occurrence of abnormal drift within the vehicle is detected by a change in the offset output of the gas rate sensor 2 when the vehicle is stopped, and when the occurrence of abnormal drift is detected, an alarm to that effect is displayed on the screen (or an alarm is issued from the signal signal processing device 4). This system is designed to prevent drivers from giving incorrect guidance. It has excellent advantages.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a driving route display device according to the present invention, and FIG. 2 is a diagram showing one form of driving route display in the same embodiment. 1... Constant temperature control tank, 2... Gas rate sensor, 3...
distance sensor, 4...signal processing device, 5...display device,
6... Operation switch board, 7... Power supply circuit, 8... Operation switch encoder and energization control device.

Claims (1)

[Claims] 1. A signal processing device calculates the position on two-dimensional coordinates for each unit travel distance of the mobile object based on the distance sensor output that detects the travel distance of the mobile object and the gas rate sensor output that detects the direction of the travel. The gas rate sensor is installed in a constant temperature control tank that constantly maintains the ambient temperature at a constant temperature, and the gas rate sensor is installed in a constant temperature control tank that constantly maintains a constant ambient temperature. A driving route display characterized in that occurrence of abnormal drift in the gas rate sensor is detected by a signal processing device from a change in offset output of the gas rate sensor when the moving body is stopped, and an alarm is issued accordingly. Device.