JPS63150616A - Run path display device - Google Patents

Abstract

PURPOSE:To perform accurate direction detection immediately after a main power switch is turned on by performing the direction detection by an earth magnetism sensor until the completion of the start-up of a gas rate sensor. CONSTITUTION:A CPU 3 computes the position of a moving body on two-dimensional coordinates at intervals of unit run distance according to detection signals from a distance detector 1 and a direction detector 2. The direction detector 2 uses the gas rate sensor with a temperature control function. The earth magnetism sensor 9 performs the direction detection until the completion of the start-up of the gas rate sensor. The current position of the moving body found by the CPU 3 is stored in a RAM 4 and then displayed on a display device 7 together with map information from a storage medium reproducing circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a travel route display device that displays the current position and travel trajectory of a moving object such as an automobile on a screen on which a map is displayed in advance.

Recently, when driving a car, etc. in an unfamiliar area, for example, in order to provide appropriate guidance so that the driver does not deviate from the planned driving course and get lost, as the car, etc. is traveling, The distance detector detects the traveling distance according to the vehicle speed, and the direction detector detects the traveling direction and the amount of change thereof every moment, and from each detected value, the current position of the vehicle, etc. on the two-dimensional coordinates is determined by sequential calculation, By storing and retaining the results, the map of the area to be traveled is displayed as continuous point information that changes every moment based on the map image information read out from the map information storage medium in advance. 2. Description of the Related Art Driving route display devices have been developed that allow drivers to confirm their current location.

Conventionally, when using a geomagnetic sensor as a direction detector in such a driving route display device, the influence of disturbances such as when a moving object passes a railroad crossing or an overpass is large, so a gas rate sensor that does not have such disturbances has been developed. I try to use it. In a gas rate sensor, a gas flow is ejected from a nozzle in a sealed casing toward a pair of temperature sensing elements as a flow sensor, and when the gas flow is deflected by the influence of an angular velocity motion applied from the outside, The size of the angular velocity (rate) is detected from the difference in the output of the temperature sensing element, and since changes in ambient temperature act as disturbances and adversely affect detection accuracy, the inside of the casing is forcibly heated by a heater, and the temperature sensor detects the magnitude of the angular velocity (rate). Temperature control is performed to maintain a constant temperature while monitoring the internal temperature.

However, in a gas rate sensor that uses a heater as a temperature control means, the power consumption at the start-up time when the heater power is turned on is larger than that in the steady state. If power is applied to the gas rate sensor at the same time as a playback device for a map information storage medium such as a laser disk that requires a motor 1 current, the current capacity of the power supply line, including the fuse, must be set to a large value. ing. Furthermore, it takes a relatively long time for the internal temperature to become constant, and the direction detection accuracy decreases during this time.

1. The present invention has been made in consideration of the above points, and even when using the gas rate sensor that takes the above-mentioned temperature control means, it is possible to suppress the current capacity in the power supply line, and also to reduce the current capacity of the main power supply. An object of the present invention is to provide a driving route display device that can perform accurate direction detection and start a driving route display operation immediately when a switch is turned on.

In order to achieve the object, the present invention provides a power supply control means for supplying power to a gas rate sensor after startup is completed by powering on a map information storage medium reproducing device when starting a travel route display device; In order to avoid delays in the travel route display operation, backup means is provided to allow the geomagnetic sensor to detect the direction until the gas rate sensor has finished rising.

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

FIG. 3 shows the configuration of the driving route display device according to the present invention. A distance detector 1 that generates a signal according to the moving distance of the MOJ body, a direction detector 2 that outputs a signal proportional to the amount of change in the direction according to a change in the traveling direction of the moving body, and the distance detector Run the pulse signal from 1 to 1
- The moving distance of the moving object is determined in total by 8111, and the moving direction of the moving object is determined from the output of the direction detector 2, and the moving distance of the moving object is determined according to the detection signals from both detectors 1 and 2. A signal processing device (CPU) that calculates the position on the two-dimensional coordinates of each
) 3 and the movement trajectory memory that sequentially stores the data of the position on the two-dimensional coordinates that changes every moment obtained by the signal processing device 3 and holds it as finite continuous position information corresponding to the current position of the moving body. A device (RAM) 4, a map information storage medium 5 consisting of a laser disk, a videotape, etc. in which image information of a plurality of maps is stored in advance, and a storage medium playback device that reads out necessary map image information from the storage medium 5. 6, a map surface image is displayed on the screen according to the read image information, and the current position of the moving body and the travel trajectory up to that point are displayed based on the position data stored in the movement trajectory storage device 4. In addition to giving display commands to the display device 7 that updates and displays the current traveling direction etc. on the same screen every moment, and the signal processing device 3, it also specifies the selection of the map to be displayed on the display device 7, and also controls the displayed map and travel trajectory. By means of an operating device 8 that can change the display format such as direction change, shift of the display position, partial enlargement display of the map and the travel trajectory, selection of the display scale, search of the map and the travel trajectory, etc. It is configured.

With this configuration, a map of the planned travel area that is accessed as appropriate and read from the map information storage medium is displayed on the screen of the display device 7, and the signal processing device x-yf3! according to the map scale rate preset by 3! , the current position (x, y) on the elevation is calculated moment by moment; the calculation results are sequentially sent to the display device 7 and also sent to the movement trajectory storage device 4 where they are stored and stored, and the stored contents can be read at any time. The display device 7 displays a display mark Ml indicating the current position of the mobile object on the travel schedule map displayed on the screen, as shown in FIG. A display mark M2 indicating the moving direction of the moving body at its current position and a travel trajectory display mark M3 from the starting point to the current position are displayed in a simulated manner following the moving state of the moving body.

In such a travel route display device, particularly in the present invention, a gas rate sensor with temperature control is used as the direction detector 2.

FIG. 5 shows an example of the configuration of this type of gas rate sensor.

In the configuration shown in the figure, the gas trapped in the casing 10 is transferred to a pump chamber 11 in which a piezo plate 12 is provided.
The compressed gas is discharged from the discharge port 13 to the outer flow path 14, rectified from the nozzle hole 16, and introduced into the inner flow path 22 of the sensor body 15.
．． It is designed to be ejected towards 18. However, when an angular velocity movement is applied to such a gas rate sensor from the outside, the gas flow in the inner flow path 22 is deflected depending on the magnitude of the movement, and the pair of temperature sensing elements 17 and 18 at that time is deflected.
An output difference is generated between the two, and a detection signal based on a minute change in the output difference is amplified by the amplifier circuit 19 and taken out to the outside.

A heater wire 2o is spirally wound around the outside of the casing 10, and a temperature sensor 21 is provided inside the casing 10, and the energization to the heater fi20 is controlled under monitoring by the temperature sensor 21. This ensures that the temperature inside the casing 10 remains constant at all times. in particular.

The signal processing device 3 in the travel route display device reads the output of the temperature sensor 21 and controls the energization of the heater wire 20 so that the detected temperature is constant.

Therefore, in the present invention, first of all, when starting the travel route display device, power is supplied to the gas rate sensor after the storage medium reproducing device 6 at the map end tK having a motor drive unit is powered on and power is completed. 1. A source supply control means is adopted.

FIG. 1 shows a specific circuit configuration for controlling the power supply.

Here, when the main power switch SW of the travel route display device is turned on, the battery power B is turned on to the storage medium playback device 6, and the time 1+[I is set in advance in anticipation of the time from when the battery power B is turned on to the storage medium playback device 6 until the start-up is completed. Then, after the timer setting time elapses after the main power switch SW is turned on, the relay RY is energized and closes the relay contact RY-a, thereby connecting the battery to the direction detector 2 consisting of a gas rate sensor with temperature control. Power supply B is now turned on.

FIG. 2 shows the current characteristics of the storage medium reproducing device 6 and the direction detector 2 consisting of the gas rate sensor at the time of startup. In the diagram, is to the main character? Ii is the time when the source switch SW is turned on, t is the time when the storage medium playback device 6 completes startup, t2 is the time when the direction detector 2 consisting of a gas rate sensor with temperature control completes startup, and Tw is the setting time of the timer T. It shows.

Therefore, by adopting such a power supply control means, it is possible to reduce the load on the battery power supply B when the main power switch SW of the driving route display device is turned on, and effectively suppress its power consumption. This makes it possible to set the current capacity in the power supply line to a small value.

As another specific means for power supply control, the signal processing device 31 detects the completion of startup of the map information storage medium reproducing device 6 by monitoring the motor speed or motor drive current, and uses the detection signal to Accordingly, the direction detector 2, which is a gas rate sensor with temperature control, may be powered on.

Note that when the engine of the mobile object is stopped while the power supply control is being executed, the signal processing device 3 detects the engine stop state and stops the power supply control.

In addition, in the present invention, secondly, as shown in FIG. 1, a geomagnetic sensor 9 is additionally provided, and the start-up of the direction detector 2 consisting of the gas seam 1 with a temperature sensor and the sensor under the aforementioned power supply control is completed. Until this happens, that is, during the period from t□ to t2 in FIG. 2, backup means is provided to allow the geomagnetic sensor 9 to detect the direction.

However, by taking such a backup means for direction detection, there is no need to use the direction detector 2, whose detection accuracy is unstable until the temperature inside the casslate sensor rises to a constant level. During this time, the direction is detected by the geomagnetic sensor 9, so that the ft+ operation for displaying the traveling route can be immediately performed with high precision.

Note that for backup purposes, it is necessary to start up the storage medium playback device 6 preferentially.

In the driving route display device according to the present invention, when a casslate sensor with temperature control that maintains the internal temperature constant by forced heating is used as a direction detector, the above-mentioned power supply means and geomagnetic sensor are used. Since it is also equipped with a backup means for direction detection, it is possible to effectively suppress the current capacity of the power supply line, and when the main power switch is turned on, accurate direction detection is immediately performed and the driving route is displayed. It has the excellent advantage of being able to start the operation.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing an example of the configuration of the power supply control circuit, Fig. 2 is a waveform diagram showing the current characteristics at the rise of the storage medium playback device and direction detection), and Fig. 3 is a waveform diagram showing the current characteristics when the A block configuration diagram of the route display device, No. 4191 is a diagram showing an example of display contents on the driving route display device screen, No. 5
The figure is a front cross section showing an example of the configuration of a gas seam 1 to a sensor with temperature control. 1. Distance detector 2. Direction detector 3. (I processing device 4. - Movement trajectory storage device 5. Map information storage medium 6. Storage medium playback device 7. Display device 8.. Operating device 9. Geomagnetic sensor ´■゛・・・Timer lkuY Relay

Claims (1)

[Claims] Based on the detection outputs of a distance detector that detects the traveling distance of the moving object and a direction detector that detects the traveling direction, a signal processing device calculates the position on the two-dimensional coordinates for each unit of traveling distance of the moving object, In a travel route display device that updates and displays the current position of a mobile object on a map displayed on a screen of a display device from a map information storage medium in which map image information is stored in advance through a storage medium playback device. ,
A gas rate sensor with temperature control that maintains an internal temperature constant through forced heating is used as the direction detector, and power supply control is performed to supply power to the gas rate sensor after the storage medium reproducing device is powered on and startup is completed. 1. A travel route display device characterized in that a backup means is provided to cause a geomagnetic sensor to perform direction detection until the gas rate sensor has finished rising.