JPH11285070A - Mobile phone with traffic accident prevention function - Google Patents

Abstract

(57) [Problem] To provide a mobile phone having a function of automatically stopping incoming and outgoing calls on the mobile phone while traveling. An ignition noise of an engine is caught by a loop antenna, and a voltage VD proportional to an engine speed is detected by an FV converter.
The determination unit 104 determines that the detected rotation speed exceeds a predetermined value,
In addition, when the number of times that the envelope detection signal S4 from the radio unit 110 crosses the reference level in a unit time is equal to or more than a predetermined value, it can be considered that fading is present, and only at that time, the vehicle is determined to be running. The control unit 113 locks the keyboard input when the determination unit 104 determines that the vehicle is traveling, and automatically notifies the caller of the incoming call by informing the caller that the vehicle is driving when there is an incoming call.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone with a traffic accident prevention function which cannot be used while driving a car.

[0002]

2. Description of the Related Art Conventional mobile phones and PHSs (hereinafter simply referred to as mobile phones) can perform various operations such as incoming and outgoing calls even while driving a car. Inadvertent traffic accidents are increasing. For this reason, there is a system that provides a service in which when a mobile phone receives an incoming call while driving, the machine automatically responds to the voice on behalf of the driver. In this system, such an automatic answering service is started when a mobile phone holder who is about to drive a telephone calls a service company immediately before driving and enters a predetermined code.

[0003]

In the system for providing the above-described automatic answering service, there is a trouble that a user makes a telephone call and registers each time the service is received. In addition, a mobile phone of a person who does not subscribe to the service receives a call even while driving. Further, there is another problem that a separate contract fee is required to receive the above service. Also,
With the above service, even during the service, the operation of the mobile phone terminal itself, such as registering in the memory, making and receiving calls, setting various functions, etc. can be done, so it is not a fundamental solution to prevent accidents while driving There was a problem.

[0004] It is an object of the present invention to disable the operation of a portable telephone owner while driving and driving a car, and to enter an automatic answering mode by a machine when there is an incoming call while driving.
Another object of the present invention is to provide a mobile phone with a traffic accident prevention function having a function of operating as a conventional mobile phone during a stop.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an engine speed detecting means for detecting a vehicle engine speed from ignition noise of a vehicle, and a time variation of a received electric field level. A fading detecting means for detecting the presence or absence of fading from the engine speed, and the engine speed detected by the fading detecting means is determined to be fading, and the engine speed detected by the engine speed detecting means exceeds a preset reference speed. , And only at that time, a determination means for determining that the car is running, and a key lock state where key input is disabled when the means determines that the car is running, and furthermore there is an incoming call. Control means for controlling the transmission of a voice indicating that a call cannot be made while driving to the caller. To provide a mobile phone with accident prevention function.

The present invention also provides a loop antenna for capturing ignition noise of an engine, and a waveform shaping section for shaping an ignition noise waveform captured by the loop antenna and outputting the waveform as a pulse waveform. An FV converter for converting the frequency of the pulse signal output from the waveform shaping unit into a DC voltage value proportional to the frequency, and outputting the signal as a signal representing the engine speed. A crossover speed detector for detecting how many times the level crosses a predetermined reference level within a predetermined time, and fading when the number of crossings detected by this means is equal to or greater than a predetermined threshold value And a deciding unit for deciding the DC voltage output from the FV conversion unit and the fading decision unit. To provide a mobile phone with a car accident prevention function, characterized in that to perform the comparison to a reference DC voltage corresponding to the irradiation speed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a mobile phone with a traffic accident prevention function according to the present invention. A loop antenna 101 for capturing ignition noise generated from the vicinity of an engine of an automobile, and an ignition noise waveform captured by the loop antenna 101 are shown. Waveform shaping section 102 for shaping S1 into a pulse waveform, waveform shaping section 102
The FV converter 103 outputs a DC voltage proportional to the signal frequency of the pulse signal S2 output from the FV converter 103, and starts or stops the operation with the control signal C from the controller 113, and outputs the DC voltage signal output from the FV converter 103. The voltage VD of S3 is compared with the reference voltage VR given from the control unit 113, and the presence or absence of fading is determined based on the envelope detection signal S4 from the radio unit. To the control unit 113, for example, a voice memory storage unit 105 storing voice data “Now driving”, a display unit 106, a voice input unit 107 including a microphone, and a voice including a speaker. An output unit 108, a keyboard unit 109, a wireless unit 110, a battery 111, an antenna 112 that resonates at a frequency related to communication of a mobile phone, and It consists controller 113 for controlling the respective units.

FIG. 2 is an external view of the housing of the portable telephone having the configuration shown in FIG. 1. The keyboard unit 109 has a traffic accident prevention function, which is a feature of the present invention, in addition to various normal operation keys. An operation key 201 for setting whether or not to perform the operation is provided. Further, the display screen 202 of the display unit 106 is also shown in FIG. The operation key 201 is an independent key different from the other keys as shown in FIG. 2. However, this is a combination of the operation of the existing keys, for example, "** 0" (the function is off), "** 1 "(function ON). In any case, the mode in which the traffic accident prevention function described below operates can be achieved only by such simple key operation.

Hereinafter, the operation of the present configuration example will be described along the flow of signals. In general, an automobile emits ignition noise generated in a cycle inversely proportional to the engine speed into the space. The loop antenna 101 is an antenna provided inside the mobile phone separately from the communication antenna for capturing the above-mentioned ignition noise. The ignition noise signal S1
Is input to the waveform shaping unit 102. The waveform shaping unit 102 shapes the waveform of the input signal to obtain a beautiful pulse signal S2.
And output to the subsequent stage. FIG. 3 shows a waveform example of the ignition noise signal S1 before the waveform shaping and a waveform example of the pulse signal S2 after the waveform shaping. Such waveform shaping is performed, for example, by full-wave rectifying the signal S1 and, when the level of the signal S1 is equal to or less than a predetermined threshold value continues for a predetermined time or more, the pulse signal S2 is changed to a low level, Can be easily realized by a circuit that switches the pulse signal S2 to a high level when the signal continues for a predetermined time or more.

The pulse signal S2 output from the waveform shaping unit 102 is input to an FV conversion unit 103, and is converted into a signal S3 of a DC voltage VD proportional to the pulse frequency, that is, the engine speed, and input to a determination unit 104. You. Judgment unit 1
04 compares the reference voltage VR from the control unit 113 with the DC voltage VD to detect whether the engine speed is equal to or higher than the threshold value. Further, the determination unit 104 determines the presence or absence of fading based on the level fluctuation of the envelope detection signal S4 input from the wireless unit 110. Hereinafter, these two determinations will be described.

First, detection of the engine speed will be described. The reference voltage VR is input from the keyboard unit 109 and set in the control unit. For example, if it is determined that the vehicle is traveling at least 1000 rotations and the vehicle is traveling at a speed less than 1000 rotations, "10
00 ”is input to the control unit 113 from the keyboard unit. Then, control unit 113 provides DC voltage corresponding to 1000 rotations to determination unit 104 as reference voltage VR. And FV
From the voltage VD of the DC voltage signal S3 from the converter 103 and the reference voltage VR, the difference voltage

## EQU1 ## V = VD-VR is calculated. When the difference voltage V is positive or 0, the engine speed is equal to or higher than the set value, and when the difference voltage V is negative, the engine speed is equal to or lower than the set value. However, since there is a possibility of erroneous determination due to ignition noise from an adjacent other vehicle, the determination as to whether the vehicle is traveling or stopped is also performed based on the determination result of the presence or absence of fading as described below.

Next, detection of fading will be described. Generally, when a mobile station travels in a standing wave electromagnetic field distribution, the envelope of a received wave fluctuates randomly. Also, the number of times the level of the received wave crosses a certain level per unit time (hereinafter referred to as the number of level crossings) increases with an increase in speed. Therefore, the determination unit 104 checks whether the level of the envelope detection signal S4 crosses one level a predetermined number of times or more per unit time. When the number of times exceeds a predetermined number, it is determined that there is fading, and when the number of level crossings is less than the predetermined number, it is determined that there is no fading. Note that the level crossing frequency reference value for determining the presence or absence of the fading is also determined by the keyboard unit 109.
More input and settings are made in advance.

Table 1 shows a method of determining whether or not the vehicle is stopped based on the two determination results described above. That is, when there is no fading, regardless of the difference voltage V, it is determined that the vehicle is stopped, and the determination signal S5 is set to "stopping". When there is fading and the difference voltage V is positive or 0, it is determined that the vehicle is running. The determination signal S5 is output as "running". The state where the difference voltage is negative and fading is “present”, that is, state 4 in which the rotation speed is less than the threshold value while the vehicle is running.
Is assumed not to exist.

[Table 1]

FIG. 5 is a flowchart showing an example of a specific method of the above-described processing of the determination unit 104. In this figure, first, the DC voltage VD from the FV converter 103 is fetched (S501), and the difference voltage V is obtained from (Equation 1) to determine whether this is non-negative (positive or 0) or negative (S502). If the difference voltage V is non-negative, the envelope detection signal S4 from the radio unit 110 is fetched next, and the number of crossings for one level is detected to detect the presence or absence of fading (S504). As a result, when it is determined that fading has occurred (“Yes” in S505), a determination signal is output to the control unit 113 as “running”, and the determination processing ends. Also S
If “No” in 502 or S505, the determination signal is output to the control unit 113 as “stopped” (S503),
The determination processing ends.

The control unit 113 controls the operation of the mobile phone in response to the judgment signal of the judgment unit 104 described above.
Is a flowchart of a process related to this control operation. In FIG. 4, it is checked first whether the traffic accident prevention function is selected (S401). This selection is performed by the user operating the operation key 201 shown in FIG. If the prevention function is not selected, the normal mode is set to operate as a normal mobile phone (S402). Here, the normal mode refers to a state in which a key operation of the mobile phone can be performed at an arbitrary time, and a call can be made and received at an arbitrary time. If the accident prevention function is selected,
The operation processing of the following traffic accident prevention function is started. That is,
First, an icon 203 indicating that the traffic accident prevention function is selected is displayed on the display screen 202 (S40).
3). Next, a key lock process for invalidating all key inputs is performed (S404), and a request to start operation is made to the determination unit 104 (S405). Upon receiving this request, the determination unit 104 performs the processing in FIG. 5 and outputs a determination signal S5. Control 113
Waits until this determination signal is received (S406), and if received, checks whether the determination signal is "stopped" or "running" (S407). If stopped, the normal mode is set (S407).
402). On the other hand, if "running" in S407, the presence or absence of an incoming call is detected (S408).
Return to RT and perform an off-hook process if there is an incoming call (S4
09), the voice data is read from the voice data storage unit 105, and the voice output unit 108 is controlled to transmit the voice data “Now driving” to the caller (S41).
0). This announcement is preferably performed a predetermined number of times. When the announcement is over, on-hook processing is performed to disconnect the line (S411), and the process returns to START.

[0016]

According to the present invention, if the driver selects a function for preventing traffic accidents by a simple key operation before driving, the automatic response mode and key input are disabled during driving, so that driving is performed. It is possible to prevent a traffic accident caused by an inadvertent operation of a mobile phone by a driver in the vehicle. Even with a mobile phone equipped with this function, passengers other than the driver can set this function to OFF so that various operations as well as outgoing / incoming calls can be made even while traveling as a normal conventional mobile phone. I can do it.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a mobile phone with a traffic accident prevention function according to the present invention.

FIG. 2 is a diagram illustrating an appearance of the mobile phone of FIG. 1;

FIG. 3 is an explanatory diagram of an engine speed detection method.

FIG. 4 is a flowchart illustrating an operation of a control unit.

FIG. 5 is a flowchart illustrating an operation of a determination unit.

[Explanation of symbols]

 Reference Signs List 101 loop antenna 102 waveform shaping unit 103 FV conversion unit 104 determination unit 105 audio data storage unit 110 wireless unit 113 control unit

Claims (2)

[Claims] 1. An engine speed detecting means for detecting a vehicle engine speed from ignition noise of a vehicle, a fading detecting means for detecting presence or absence of fading from a time variation of a received electric field level, and the fading detection. Means for determining that the vehicle is running when it is determined that there is fading by the means, and when the engine speed detected by the engine speed detecting means exceeds a preset reference speed. A determination unit; and a key lock state in which key input is disabled when the vehicle is determined to be running by the determination unit, and further, when an incoming call is received, a voice is transmitted to the caller indicating that the vehicle is not being driven and a call cannot be made. Mobile phone with a traffic accident prevention function, comprising: 2. The engine rotational speed detecting means includes: a loop antenna for capturing ignition noise of an engine; a waveform shaping unit for shaping an ignition noise waveform captured by the loop antenna and outputting the waveform as a pulse waveform; An FV conversion unit that converts the frequency of the pulse signal output from the unit into a DC voltage value proportional to the frequency and outputs the DC voltage value as a signal representing the engine speed, wherein the fading detection unit has a predetermined reception electric field level. A crossover speed detector for detecting how many times a predetermined reference level crosses in time, and fading for determining that there is fading when the number of crossings detected by this means is equal to or greater than a predetermined threshold value A determining unit configured to determine whether the DC voltage output from the FV conversion unit and the reference rotational speed correspond to each other. Traffic accident prevention function mobile phone according to claim 1, characterized in that to perform the comparison with the reference DC voltage.