JPS61194477A - Onboard navigator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an on-vehicle navigation device.

In-vehicle navigation devices are equipped with multiple sensors to detect various driving parameters, and display commands after departure based on the sensor output and departure and destination data entered in advance by passengers, etc. Depending on the vehicle, some vehicles display driving guide information such as distance traveled to the destination, degree of arrival, average speed, and expected time of arrival at the destination on the instrument panel of the vehicle.

In such an in-vehicle navigation device, in order to display the average speed and expected time of arrival at the destination, it is necessary to measure the travel time from the departure point and calculate it based on the measured time. However, simply measuring the elapsed time from the time of departure to the current time as the travel time cannot be considered as the actual travel time because it includes rest time along the way, and the time when the vehicle stops running cannot be considered as the actual travel time. If the vehicle stops, the actual travel time does not include the pause time during travel such as waiting at a traffic light, which causes the problem that the accuracy of travel guide information such as the estimated time of arrival at the destination decreases. there were.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an in-vehicle navigation device that improves the accuracy of travel guide information by accurately providing actual travel time.

The in-vehicle navigation device of the present invention is characterized in that it measures travel time only when it is detected that at least one operating member that is selectively operated when the vehicle starts is at a predetermined position.

Embodiments of the present invention will be described below with reference to the drawings.

An automatic vehicle navigation system according to an embodiment of the present invention shown in FIG. 1 is provided with a control circuit 1 consisting of a microconbeater. Control circuit 1
These include an azimuth sensor 2 that detects the direction of the earth's magnetic field, a vehicle speed sensor 3 that generates rotation pulses every time the wheels of the vehicle rotate by a predetermined angle and detects the vehicle speed from the number of rotation pulses generated per unit time, and a vehicle speed sensor 3 that measures travel time. A time counter 4, a shift sensor 5 for detecting that the shift position of the automatic transmission is at the P (parking) position, and an ignition switch 6 are connected. Further, a display drive circuit 7 and a keyboard 8 are connected to the control circuit 1. The display drive circuit 7 drives the display 9 to display driving guide information. The keyboard 8 is used to input various commands such as navigation operation commands, and data such as departure point and destination.

In such a configuration, in response to a navigation operation command generated from the keyboard 8 by a key operation by the passenger, the control circuit 1 generates a data input display command to the display drive circuit 7 to request data input of the departure point and destination. do. This causes the display 9 to display that data should be input. Data on the departure point and destination are entered from the keyboard 8 using codes representing predetermined points. When the data on the departure point and destination are input, the control circuit 1 repeatedly executes the operations shown in FIG. 2.

In the operation of the control circuit 1, it is determined whether the ignition switch 6 is on (step 21).

Whether the ignition switch 6 is on is determined by whether or not the output voltage VB of the battery 10 is being supplied from the ignition switch 6.0 If the ignition switch 6 is on, the shift position is at the P position based on the output of the shift sensor 5. It is determined whether there is one (step 22).

If the shift position is not the P position, it is assumed that the vehicle has started from the starting point, is running, or is in a paused state while running, and a count operation command is issued to the time counter 4 (step 23). The time counter 4 starts or restarts time measurement in response to this count operation command, and further continues time measurement in response to a count operation command during time measurement. Next, the measured time of the time counter 4, that is, the travel time, vehicle speed, and the output of the direction sensor 2 are read, and based on the read data, travel guide information such as average speed and travel distance to the destination is calculated. and stored in the memory in the control circuit 1 (step 2
4).

The driving guide information is read out from the memory in the control circuit 1 in response to a display command from the keyboard 8, and is displayed on the display 9 by being supplied to the display drive circuit 7.

Meanwhile, in step 21, the ignition switch 6
If it is determined that the vehicle is off, it is determined that the vehicle is parked, and a count stop command is issued to the time counter 4 (step 25).

In response to the count stop command, the time counter 4 stops the time measurement operation and holds the measured time at that time. Further, if it is determined in step 22 that the shift position is the P position, step 25 is executed in the same way as when the ignition switch 6 is off, and the time counter 4 is
time measurement is stopped.

In such an in-vehicle navigation device, after turning on the ignition switch when starting at the starting point,
When the shift position of the transmission is shifted from the P position to another position such as the D (drive) position, the time counter 4 starts measuring time. After starting, when the vehicle is stopped for a break or the like and parked, the time counter 4 stops measuring time when the shift position of the transmission is returned to the P position. ′! Even if the ignition switch 6 is turned from on to off before returning the shift position of the transmission to the P position, the time measurement of the time counter 4 is similarly stopped. When starting again after a break, the ignition switch 6 is turned on and the shift position of the transmission is shifted from the P position to another position, and the time counter 4 restarts time measurement. In addition, when the vehicle stops temporarily, such as when waiting at a traffic light, the vehicle speed becomes 0, but the ignition switch 6 is turned on and the shift position other than the P position is maintained, so it is assumed that the vehicle is traveling and the time counter 4 continues to measure time. . Therefore, the time measured by the time counter 4 represents the actual running time, which includes the time when the vehicle is stopped while the vehicle is running, and excludes the time when the vehicle is parked for a break.

In the embodiments of the present invention described above, an ignition switch and an automatic transmission are used as operating members that are selectively operated when the vehicle starts, but in a vehicle with a manual transmission, only an ignition switch is used. It's also good.

Further, the direction sensor 2 may be one that uses a gyro or a signal transmitted from an artificial satellite in addition to a magnetic one, and the vehicle speed sensor 3 may be of any type as long as the distance traveled can be obtained from its output. Furthermore, it is clear that the calculated travel guide information is not limited to being displayed on the display 9, but may be output to a printer, magnetic tape/disk, etc., for example.

Effects of the Invention As described above, the in-vehicle navigation system of the present invention measures the travel time by prompting the vehicle to actually drive, so it can measure the travel time with extremely accurate accuracy, including the time during which the vehicle is running and excluding the rest time. The travel time can be obtained, and by using this actual travel time, it is possible to improve the accuracy of travel guide information such as average speed and expected destination arrival time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow diagram showing the operation of a control circuit in the apparatus shown in FIG. Explanation of symbols of main parts l... Control circuit 2... Orientation sensor 3.
・・Vehicle speed sensor 4・・Time color/re5・・
・Shift sensor 6...Ignition switch 7...Display drive circuit 8...Keyboard 9...
·display

Claims (2)

[Claims] (1) A time measuring means for measuring the traveling time of the vehicle, a calculating means for calculating travel guide information based on the measured time of the time measuring means, and at least one operation selectively operated when the vehicle starts. The device is characterized in that it includes a detection means for detecting the position of the member, and a control means for operating the time measurement means only when it is detected from the output of the detection means that the position of the operating member is at a predetermined position. In-vehicle navigation device. (2) The in-vehicle navigation device according to claim 1, wherein the detection means detects an on/off state of an ignition switch and a shift position of an automatic transmission.