JP3951220B2 - Vehicle, position detection device, and time display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle, a position detection device, and a time display device, and is applied to, for example, a vehicle equipped with a car navigation device, and various information devices mounted on this type of vehicle that incorporate a time display device, that is, a clock. be able to. The present invention makes it possible to easily and reliably correct a time lag between a plurality of timepieces by setting the time display device based on the current time detected by a position detection device using a satellite. Like that.
[0002]
[Prior art]
Conventionally, a plurality of timepieces are mounted on a vehicle. That is, in the vehicle, a clock functioning only as a time display device is provided to notify the passenger of the time. Further, in a vehicle, the entire operation is controlled by a microcomputer, and such a microcomputer is also provided with a function of measuring the current time. In such a control by a microcomputer, it has been proposed to record a vehicle abnormality or the like for use in maintenance.
[0003]
On the other hand, in a car navigation device using GPS (Global Positioning System), the current time is detected with high accuracy by receiving and processing radio waves from satellites, and this current time is used as a reference. The current position is measured.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, a timepiece mounted on a vehicle has a feature that an error is small by operating based on a reference signal having high stability and high accuracy generated by a crystal oscillation circuit. However, even if a crystal oscillation circuit is used, it is not possible to completely prevent the occurrence of errors, so that even in this type of timepiece, it is necessary to set the time when used for a long period of time. As a result, in the vehicle, a situation occurs in which a plurality of mounted watches keep different times.
[0005]
When such an occurrence occurs, for example, the time when the abnormality recorded for maintenance is detected may not correspond to the time when the user actually felt the abnormality. When a plurality of clocks are provided in the space, it is desirable to easily correct the time lag between these clocks.
[0006]
The present invention has been made in consideration of the above points, and proposes a vehicle capable of easily and reliably correcting a time lag between a plurality of timepieces, a position detecting device for use in correcting the time lag, and a timepiece. It is something to try.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the invention of claim 1 is applied to a vehicle, processes a radio wave obtained from a satellite to detect a current time, and detects a current position based on the current time; A time display device that is separate from the position detection device and adjusts the current time based on the current time detected by the position detection device, and a power supply line connected to the position detection device and the time display device A power supply voltage is output, and a power supply for supplying power to the position detection device and the time display device is provided. In addition, the position detection device outputs information necessary for time adjustment to the power supply line, and transmits the information necessary for time adjustment superimposed on the power supply voltage to the time display device. By acquiring information necessary for time adjustment from the line and adjusting the current time, the current time is adjusted based on the information necessary for time adjustment transmitted superimposed on the power supply voltage.
[0008]
According to a fourth aspect of the present invention, a power supply is applied to a position detection device that is mounted on a vehicle, processes radio waves obtained from satellites, detects the current time, and detects the current position with reference to the current time. By operating with the power supply voltage of the line, receiving power supply from the power supply connected to the power supply line, and outputting information necessary for time adjustment of the time display device mounted on the vehicle to the power supply line, Information necessary for time adjustment is transmitted to the time display device by superimposing it on the power supply voltage .
[0009]
According to a fifth aspect of the present invention, the present invention is applied to a time display device mounted on a vehicle , operates with a power supply voltage of a power supply line, receives power from a power supply connected to the power supply line, and supplies power. from the line, by aligning the time the current time to obtain the information necessary for time setting, aligning the time the current time based on the information necessary for time setting transmitted is superimposed on the power voltage.
[0010]
According to the configuration of claim 1, a position detection device that processes a radio wave obtained from a satellite to detect a current time, detects a current position with reference to the current time, and a position detection device are separated from each other. In a timepiece functioning as a time display device mounted on a vehicle, the position detection device has high accuracy by including a time display device that sets the current time based on the current time detected by the detection device. The time can be set according to the reference, and thereby, a time lag can be easily and reliably corrected between the position detection device and the time display device. Moreover, the time lag can be corrected easily and reliably without providing any special wiring or the like for adjusting the time.
[0011]
According to the configuration of claim 4 , the present invention is applied to a position detection device that is mounted on a vehicle, detects a current time by processing a radio wave obtained from a satellite, and detects a current position based on the current time. By outputting information necessary for time adjustment of the time display device mounted on the vehicle through a line that receives the supply of power, the time display device directly mounted on the vehicle outputs the information to the power line. By adjusting the time based on the information necessary for adjusting the time, it is possible to adjust the time according to a highly accurate reference, thereby easily and reliably causing a time shift between the position detection device and the time display device. It can be corrected. Moreover, the time lag can be corrected easily and reliably without providing any special wiring or the like for adjusting the time.
[0012]
Thereby, according to the structure of Claim 5 , it applies to the time display apparatus mounted in a vehicle, and can correct | amend the time shift easily and reliably. Moreover, the time lag can be corrected easily and reliably without providing any special wiring or the like for adjusting the time.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0014]
(1) Configuration of Embodiment FIG. 1 is a block diagram showing a partial configuration of a vehicle according to an embodiment of the present invention. In the vehicle 1, the car navigation device 2 and the timepiece 3 are operated by being supplied with electric power from a battery 4 that is a common power source.
[0015]
In the car navigation device 2 here, a GPS (Global Positioning System) unit 5 receives a radio wave obtained from a GPS satellite and processes the received radio wave to detect the current time with high accuracy. Further, the current position is detected by processing the received radio wave with reference to the current time thus detected.
[0016]
The controller 7 is a computer that controls the overall operation of the car navigation device 2, receives an input of a destination or the like by operating a remote commander (not shown), and controls the operation of the car navigation device body 6 and the like. The display unit 8 is composed of a liquid crystal display device and displays a map and the like.
[0017]
The car navigation device main body 6 is configured by an optical disk drive device or the like that records map data, and the controller 7 controls the display unit 8 to reach the destination based on the current position information detected by the GPS unit 5. , A map near the current position, etc. are displayed, thereby providing services such as route guidance to the user.
[0018]
In these processes, the car navigation device main body 6 monitors the current time detected by the GPS unit 5 and outputs information necessary for time adjustment of the timepiece 3 by a timing signal S10 through a line that receives power supply. To do. Specifically, the car navigation device body 6 raises the signal level of the gate signal S1 from a predetermined time before the reference time t0 to the reference time t0, and the amplifier circuit 9 amplifies and outputs the gate signal S1. To do. The modulation circuit 10 raises the signal level of the timing signal S10 at a predetermined period during the period when the gate signal S1 rises.
[0019]
As a result, in the car navigation device 2, as shown in FIG. 2 (B), the signal level of the timing signal S10 is raised in a predetermined number of pulses from a predetermined time before the reference time t0 to the reference time t0. The timing signal S10 is output so that the rising timing of the signal level in the last pulse becomes the reference time t0 at the rising edge of the predetermined number of pulsed signal levels. In this embodiment, the reference time t0 is set to 00: 00, 00: 00 and 00: 00.
[0020]
In the car navigation device 2, this timing signal S10 is output to the positive power supply line of the battery 4, thereby outputting information necessary for time adjustment of the timepiece 3 via the line that receives power supply. ing.
[0021]
FIG. 3 is a block diagram showing a detailed configuration of the timepiece. The timepiece 3 is a timepiece that is separate from the car navigation device 2 that is a position detection device and functions only as a time display device that is arranged on the dashboard and simply displays the time. The watch 3 is not only used as a time display device as described above, but also added to the original function such as a car audio device having a function of displaying time and various in-vehicle information devices. The present invention can be widely applied in the case where it is configured separately from the car navigation device 2 that is a position detection device. The timepiece 3 divides a reference signal obtained from the crystal oscillation circuit by a counter 18 including a crystal oscillation circuit by a crystal resonator 15, and drives a liquid crystal display panel (LCD) 16 based on the frequency division result. To display the current time.
[0022]
In the timepiece 3, a high-pass filter circuit (HPF) 17 is connected to the power supply line, and thereby the timing signal S 10 output from the car navigation device 2 is input via the high-pass filter circuit 17. As shown in FIG. 2 (A), the counter 18 has a signal level of the gate signal S2 for a predetermined time before and after the time displayed on the liquid crystal display panel 16 corresponding to the reference time t0 in the car navigation device 2. Thus, the timing signal S10 input from the high-pass filter circuit 17 via the gate circuit 20 is input to the reset signal input terminal RESET during the period when the signal level of the gate signal S2 is being increased. . Here, in this embodiment, before and after the time corresponding to the reference time t0, the predetermined time is set from 59 minutes 00 seconds (time t1) to 01 minutes 00 seconds (time t2) every hour. ing.
[0023]
When a pulse having a predetermined number of pulses is input to the input terminal RESET of the reset signal, the counter 18 resets the count value at the last falling edge of the pulse, and thus at the timing of the last falling edge of the pulse. The time has been adjusted. In this reset process, the counter 18 carries the count value in minutes to the count value in hours from 59:00 to 59 minutes 59 seconds, and from 00 minutes 00 seconds to 01 minutes 00. Until the second, such carry processing is stopped, so that the time is set correctly regardless of whether the time is delayed or advanced with respect to the current time in the car navigation device 2. Has been made.
[0024]
Thereby, in the timepiece 3, the processing procedure of FIG. 4 is repeated, and the time is adjusted according to the information necessary for the time adjustment obtained through the line to which power is supplied. That is, when the timepiece 3 starts operating, the timepiece 3 moves from step SP1 to step SP2, and determines whether or not the current time of the timepiece 3 has reached 59 minutes. If a negative result is obtained, step SP2 is repeated. As a result, the timepiece 3 waits for 59 minutes every hour, and when it reaches 59 minutes, moves to step SP3.
[0025]
Here, the timepiece 3 outputs the gate signal S2 to open the gate 20, and waits for the input of a time-setting pulse from the car navigation device 2 in the following step SP4. That is, the timepiece 3 determines whether or not a pulse is detected in step SP4. If a negative result is obtained, the timepiece 3 moves to step SP5 and determines whether or not the time of the timepiece 3 has reached 01 minutes. If a negative result is obtained here, the timepiece 3 returns to step SP4. As a result, the timepiece 3 repeats the processing procedure of steps SP4-SP5-SP4 from 59:00 to 01:00 every hour, and when the timing signal S10 is input, moves from step SP4 to step SP7, After matching, return to step SP2. On the other hand, if the timing signal S10 is not input, for example, because the car navigation device 2 is not powered on, the process proceeds from step SP5 to step SP6 to stop the output of the gate signal S2 and close the gate. After that, the process returns to step SP2.
[0026]
(2) Operation of Embodiment In the above configuration, in this vehicle, the timepiece 3 is operated by the power source of the battery 4 and the reference signal with high accuracy and stability obtained by driving the crystal unit 15 is counter 18. The liquid crystal display panel 16 is driven by the frequency division, and the current time is displayed, for example, indoors.
[0027]
On the other hand, when the user starts up the operation of the car navigation device 2, the GPS unit 5 processes the radio wave obtained from the satellite and detects the current time. In the vehicle 1, the current time detected via the radio wave of the satellite is required for time adjustment to a power supply line that supplies power to the car navigation device 2 at a timing of 00:00, 00:00 every hour. A pulsed timing signal S10 as information is output.
[0028]
Thereby, in the timepiece 3, the time difference between the car navigation apparatus 2 and the timepiece 3 can be corrected easily and reliably in the vehicle 1 by adjusting the time with reference to the timing signal S10.
[0029]
That is, in the timepiece 3, the gate 20 is opened by the gate signal S <b> 2 while the time of the timepiece 3 changes from 59:00 to 01:00, and the timing signal S <b> 10 obtained through the power supply line resets the counter 18. As a result, the time of the timepiece 3 is set to the time of the car navigation device 2 with reference to the timing signal S10.
[0030]
In this way, the time of the car navigation device 2 which is a reference for time adjustment is accurate time information obtained by processing the radio wave from the satellite, which is high for the watch 3 in the car. The time can be ticked with accuracy.
[0031]
(3) Effects of Embodiments According to the above configuration, a plurality of timepieces can be obtained by setting the time of other clocks based on the current time detected by the GPS unit that is a position detection device using a satellite. It is possible to easily and reliably correct the time lag between the two.
[0032]
That is, in the vehicle, the GPS unit processes the radio wave obtained from the satellite to detect the current time, detects the current position with reference to the current time, and determines the current time of other clocks with reference to the current time. By adjusting the time, it is possible to easily and reliably correct a time lag between a plurality of timepieces.
[0033]
At this time, power is supplied by a common power source to the watch and the car navigation device, and information necessary for time adjustment is transmitted and received through this power supply line, so that no special wiring is required for time adjustment. Etc., it is possible to easily and reliably correct a time lag between a plurality of timepieces.
[0034]
Also in the car navigation device, it is possible to set the time of another clock with a simple configuration that simply outputs information necessary for time setting via a line that receives power supply. Information necessary for time adjustment can be acquired via a line that receives power supply, and the time can be adjusted with a simple configuration in which the time is adjusted based on the information.
[0035]
(4) Other Embodiments In the above-described embodiment, the case where the time is set between the car navigation device and the watch has been described. However, the present invention is not limited to this and is mounted on various information devices. The present invention can also be widely applied to time adjustment with a time display device.
[0036]
【The invention's effect】
As described above, according to the present invention, the time display device is set with respect to the current time detected by the position detection device using a satellite, thereby making it possible to easily and reliably prevent a time difference between a plurality of clocks. Can be corrected.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a vehicle according to an embodiment of the present invention.
FIG. 2 is a signal waveform diagram for explaining an operation of the car navigation device of FIG. 1;
3 is a block diagram illustrating a configuration of the timepiece of FIG. 1;
4 is a flowchart for explaining the operation of the timepiece of FIG. 3;
[Explanation of symbols]
1 ... vehicle, 2 ... car navigation device, 3 ... watch, 4 ... battery, 5 ... GPS unit

Claims (5)

A position detection device that detects a current time by processing radio waves obtained from a satellite, and detects a current position based on the current time;
A time display device that is separate from the position detection device and sets the current time based on the current time detected by the position detection device ;
A power supply that outputs a power supply voltage to a power supply line connected to the position detection device and the time display device, and supplies power to the position detection device and the time display device;
The position detection device includes:
By outputting the information necessary for the time adjustment to the power supply line, the information necessary for the time adjustment is transmitted to the time display device superimposed on the power supply voltage,
The time display device
By acquiring information necessary for the time adjustment from the power supply line and adjusting the current time, the current time is based on the information necessary for the time adjustment transmitted superimposed on the power supply voltage. vehicle, characterized in that the combined time of the. The position detection device includes:
A timing signal is generated by raising a signal level in a predetermined number of pulses between a predetermined time before a reference time for adjusting the time detected by the position detection device and the reference time,
By outputting the timing signal to the power supply line, information necessary for the time adjustment is output to the power supply line,
The time display device
Before and after the reference time detected by the time display device, for a certain period, selectively input the timing signal,
By adjusting the current time based on the rise of the signal level in the input timing signal, the current time is adjusted based on information necessary for the time adjustment.
The vehicle according to claim 1. The position detection device includes:
A car navigation device,
The time display device
Either a clock arranged on the dashboard of the vehicle for displaying time, a car audio device having a function for displaying time, or various in-vehicle information devices
The vehicle according to claim 1. A position detection device that is mounted on a vehicle, detects a current time by processing radio waves obtained from a satellite, and detects a current position based on the current time,
Operates with the power supply voltage of the power supply line, receives power supply from the power supply connected to the power supply line,
By outputting information necessary for time adjustment of the time display device mounted on the vehicle to the power supply line, the information necessary for time adjustment is transmitted to the time display device superimposed on the power supply voltage. A position detecting device characterized by that. A time display device mounted on a vehicle,
Operates with the power supply voltage of the power supply line, receives power supply from the power supply connected to the power supply line,
From the power supply line, by Sesuru match time current time information to acquire necessary the time setting, the current time on the basis of the information necessary for the time setting which is transmitted by being superimposed on the power supply voltage time display device, characterized in that the combined time to.

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