JPH0321847B2 - - Google Patents

Description

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

Prior Art In general, in order to prevent the driver from deviating from the planned driving course and getting lost when driving at night or in unfamiliar areas, roads are set in advance for the driver to provide appropriate guidance. A device has been developed that displays the current location on a map.

Conventionally, in this type of travel route display device,
A distance detector detects the distance traveled by the vehicle according to the vehicle speed, and a rate-type direction sensor that detects the angular velocity of change in the yaw direction detects the amount of change in direction according to the direction of travel of the vehicle. The current position of the vehicle on the travel route is determined by calculation, 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 sensor, which is more resistant to vibration than a gyroscope, has good sensitivity, and is rich in quick response (see Japanese Patent Application No. 1983-39490). 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 the change in the gas flow caused by the change in direction, the gas flow relative to the detection angle direction is better than the gyroscope. The accuracy with which the rate sensor is horizontally mounted directly contributes to its detection accuracy, and variations in its initial sensitivity directly affect the detection accuracy.

However, in the case of automobiles, etc., there is no standard accuracy for the mounting position of the direction sensor, so conventionally it was necessary to use a spirit level etc. to adjust the installation of the direction sensor, and the horizontal accuracy was The adjustment work to maintain the grip has become complicated.

Purpose The present invention has been made in consideration of the above points, and it is possible to easily adjust the output of a direction sensor using a rate method, including horizontal installation errors on a moving object and variations in its initial sensitivity. It is an object of the present invention to provide a driving route display device which can easily adjust the output in response to changes in the sensitivity of the direction sensor over time.

Configuration An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the driving route display device according to the present invention is housed in a constant temperature control tank 1 heated by a heater, and outputs a signal proportional to the amount of change in the direction of travel of the vehicle according to the gas rate. A sensor 2, a distance sensor 3 that generates a signal corresponding to the distance traveled by the vehicle, and a position on two-dimensional coordinates for each unit distance traveled by the vehicle are determined by calculation according to the outputs of these sensors. A signal processing device 4 stores data on two-dimensional coordinates that change every moment and holds it as finite continuous position information corresponding to the driving route of the vehicle, and centrally controls the entire device, and a signal processing device 4 that controls the entire device according to the processing output a display device 5 that updates and displays the travel trajectory, current direction of travel, travel distance, required time, etc. in a certain section up to the current location of the vehicle; an operation switch panel 6 consisting of a digital code switch that can appropriately change the settings (conversion, display scale rate, etc.); and an adjustment switch 7 consisting of a digital code switch that can appropriately adjust the output of the gas rate sensor 2. A battery power supply E is connected via an ignition switch IG/SW and a fuse F, and the energization to the heater of the constant temperature control tank 1 is controlled in conjunction with the opening/closing of the ignition switch IG/SW. It is composed of a power supply circuit 8 and an operation switch encoder and energization control device 9 that transmits the operation contents of the operation switch panel 6 as an encoded signal to the signal processing device 4 and controls the energization of the power supply circuit 8. There is.

The basic 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 8, 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) is calculated moment by moment, and the calculation 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, on the display device 5, a mark M1 indicating the current position B with directionality and a mark M2 indicating the travel trajectory from the starting point A to the current position B are displayed. This will be done in a simulated manner, following the current situation. Further, as shown in FIG. 2, the display device 5 displays a display D1 (this is a signal processing It is sufficient to incorporate a timer that operates only while driving in the device 4), and display D of the total distance traveled so far.
2, or a display D3 of the scale set by the operation switch board 6, etc., is displayed 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.

In addition, 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 8, and the power supply circuit 8 is then turned off for a preset period of time. The heater of the constant temperature control tank 1 is continuously energized, and the temperature inside the constant temperature control tank 1 is kept constant during that time, and an alarm such as a buzzer is operated to notify the same.

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, at this time, the alarm is activated to allow the driver to confirm acceptance of keeping the heater energized, thereby preventing unnecessary power consumption due to forgetting to turn off the main switch of the driving route display device. become.

A particular feature of such a travel route display device according to the present invention is that the output of the gas rate sensor 2 can be adjusted by the adjustment switch 7.

In other words, in order to correct the horizontal installation error of the gas rate sensor 2 and the output error that occurs due to variations in its initial sensitivity or changes in sensitivity over time, first drive the car, go around a suitable location, and then set the starting point. I'll try to get it back. At that time, if the output adjustment of the gas rate sensor 2 is not optimal, the horizontal installation error of the gas rate sensor 2, the variation in its initial sensitivity, or Due to output errors caused by changes in sensitivity over time, etc., a traveling locus in which the start point and return point do not match will be displayed. In that case, the output of the gas rate sensor 2 is adjusted appropriately using the adjustment switch 7 according to the difference between the start point and the return point, and the correction is made so that the start point and the return point always match, as shown in c of the same figure. let Note that FIG. 3a shows, as an example, a running trajectory when the output sensitivity of the gas rate sensor 2 is small; in this case, it is necessary to make an adjustment to increase the output sensitivity using the adjustment switch 7; Figure b shows a travel trajectory when the output sensitivity of the gas rate sensor 2 is high; in this case, it is necessary to make adjustments to lower the output sensitivity. Further, the contents of the digital code instructed by the adjustment switch 7 are decoded by the operation switch encoder and energization control device 9, and the adjustment signal is sent to the signal processing device 4, where the output of the gas rate sensor 2 is adjusted. will be done as appropriate.

As described above, in the driving route display device according to the present invention, the gas rate sensor can be easily adjusted by simply operating the adjustment switch 7 appropriately according to the difference between the start point and the return point in the driving route display after driving the car around the vehicle. 2 output adjustments can be made.

Effects As described above, the driving route display device according to the present invention is based on the output of a distance sensor that detects the distance traveled by a moving object, and the output of a rate-type direction sensor that detects changes in direction as the moving object travels. A system that calculates the position of a moving object on two-dimensional coordinates for each unit distance traveled, and updates and displays the determined current position of the moving object on the screen, which changes every moment as the moving object travels. a traveling trajectory display means capable of displaying the traveling trajectory of a moving object on the screen based on the stored data while sequentially storing data of the current position of the moving object; and a starting point and return of the traveling trajectory based on the turning movement of the moving object. The rate type direction sensor output adjustment means is provided to adjust the output of the rate type direction sensor according to the state of deviation from the point, and the rate type direction sensor's horizontal mounting error and its initial sensitivity due to the rate type are reduced. It has the excellent advantage that output errors due to variations and changes in sensitivity over time can be easily corrected, and the traveling route can always be accurately displayed.

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram showing an embodiment of the driving route display device according to the present invention, Fig. 2 is a diagram showing one form of the driving route display in the same embodiment, and Figs. Figures 1 and 2 are diagrams showing a traveling locus display when the output sensitivity of the gas rate sensor is inappropriate, and Figure c is a diagram showing a traveling locus display when the output sensitivity is appropriate. 1... Constant temperature control tank, 2... Gas rate sensor,
3...Distance sensor, 4...Signal processing device, 5...
Display device, 6... Operation switch board, 7... Adjustment switch, 8... Power supply circuit, 9... Operation switch encoder and energization control device.

Claims (1)

[Claims] 1. The position on the two-dimensional coordinates for each unit distance traveled by the moving object is determined based on the output of the distance sensor that detects the distance traveled by the moving object and the output of the rate-type direction sensor that detects changes in direction as the object travels. In a device that calculates the current position of a moving object by calculation and updates it on the screen, the data of the current position that changes every moment as the moving object is stored is stored sequentially, and the stored data is used. a traveling trajectory display means capable of displaying the traveling trajectory of the moving body on the screen; and a rate-type direction sensor configured to display the rate-type direction sensor according to the deviation between the starting point and the return point of the traveling trajectory based on the turning motion of the moving body. 1. A travel route display device comprising: output adjustment means for a rate-type direction sensor that adjusts output.