JPS5925730A - Cardiac pulse meter on vehicle - 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 a heartbeat R1 for measuring a person's pulse, and particularly to a heartbeat R1 for measuring a person's pulse.
9. Regarding the heartbeat 11 installed in -1-1.

1 [When driving the handle, the driver's @14 (condition is I)
If not, there is a high possibility of causing an accident.

For example, if you continue to drive for a long time without taking a break, fatigue accumulates, your health condition worsens, and your ability to concentrate decreases.

Heart rate is one barometer that can tell us about a person's health condition. As a device to measure heart rate.

Recently, small portable heart rate devices have been sold.

Although this type of heart rate device can be carried anywhere, its measurement accuracy is low. For example, even if a driver of a car brings such a heartbeat monitor into the vehicle in order to know his or her health condition, the heartbeat must be measured while the vehicle is stopped. Failure to do so is dangerous. However, for example, on a highway, it is not possible to stop the vehicle while driving for a long time, so heart rate measurement cannot be performed during that time. The need for heart rate measurement in vehicles is higher on expressways than on general roads, so if heart rate measurement cannot be performed on expressways, there is little value as an in-vehicle heart rate.

The first object of the present invention is to provide an on-vehicle heart rate i1 that can perform highly accurate heart rate measurement, and the second object is to provide an on-vehicle heart rate i1 that allows the driver to safely measure his or her heart rate while the vehicle is running. The third purpose is to provide in-vehicle heartbeat H1 that can tell the driver's physical and mental condition, and the fourth purpose is to prevent the driver from falling asleep while driving. It is.

In order to achieve the object described in 1., in the present invention, two conductors are arranged on the soup link wheel or the spokes that support it, and fluctuations in the potential difference between the conductors are suppressed. Detect and measure the heartbeat, and display or output the measurement results.In other words, the potential difference between a person's right and left hands changes in synchronization with the heartbeat. When a person touches two conductors with their right and left hands at the same time, the potential difference between the conductors changes in response to the heartbeat.The change in potential is detected and the heartbeat is detected. Measure the size.

Accordingly, since the detection unit is located at or near the steering wheel, the driver can measure the heartbeat while holding the steering wheel and driving the vehicle.

In one preferable aspect of the present invention, the device includes at least one of an alarm device that emits a warning sound when the measurement result deviates from a predetermined range, and an audio output device that notifies the heart rate by an announcement. According to this, since the presence or absence of an abnormal heart rate can be determined by the ears and there is no need to check the heart rate by the eyes, the heart rate can be safely measured while driving a car on the expressway.

Further, in a preferred embodiment of the present invention, the heart rate and changes in the period between each heartbeat are detected from the heartbeat information from the conductor, and an alarm is output in accordance with the results. According to this, the driver's drowsy state can also be determined. The heart rate may be measured by measuring the number of fluctuations in the electrical signal from the conductor, that is, the number of beats within a predetermined time, or by measuring the time between each heartbeat, or the period.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1a shows the vicinity of the steering link wheel of a type of automobile in which the present invention is implemented. Referring to FIG. 1a, I is a steering wheel, 2 and 3 are spokes supporting the steering wheel 1, and 4 is a central pad equipped with a body on the side of the heartbeat. The steering wheel 1 is provided with a pair of conductive plates 5 and 6 at positions facing each other with respect to the wheel axis. Central Bano 1-
/l has suits 9, 10. Light emitting diode indicator 1
7 segments of 3 and 3 techniques [-Light emitting diode display I
4 is 0 (11 is less.

Section Ib-Ib in FIG. 1a and 1. c-1
The c-line cross section is shown as 1st. Shown in Figures b and 1c.

1B and 1C, the conductor plates 5 and 6 are thin metal plates curved to match the surface shape of the steering wheel 1, and are attached to the resin cushion 7 of the steering wheel 1. Only the embedded "C1" surface is exposed. Lead wires 1.1 and 12 are connected to the conductor plates 5 and 6, respectively.Lead wire 1
1 and 12 are passed through the cushion 7 and the other ends are connected to the main body of the upper middle heartbeat 81 inside the middle heat pad 4. +5 is a metal mandrel.

FIG. 2 shows the general configuration of the electric circuit for tlf and J-heartbeat a1 in FIG. 1a. The configuration will be explained with reference to FIG. In this embodiment, a single-chip microcomputer (8048) CP manufactured by Intel Corporation is used.
[, J is used. The conductor plates 5 and 6 are connected to different input terminals of the differential amplifier DFA.

The output terminal of the differential amplifier DFA is connected to the filter FLJ. Filter FLI is a low-pass filter, that is, a noise filter that removes frequency components above a predetermined value. The output of the filter F L 1 is connected to an amplifier AM2 and a comparator CI''I.Amplifier AM, 2
The above-mentioned light emitting diode indicator 13 is connected to the output terminal of.

The output terminal of the comparator CPI is connected to the microcomputer CPU.
is connected to the external interrupt input terminal INT. The switches 9 and 1o on the central pad 4 are connected to the input port 1- of the CPU via inverters INI and IN2, respectively. VRI and VR2 are variable resistors for setting the heart rate upper limit and [:' limit, respectively. The movable parts of the variable resistors VRI and VR,2 are respectively connected to the input terminals 0 and 1 of the Δ/D converter Δl)C. A/D converter A
l) The conversion data output terminal and input channel selection input terminal of C are connected to the microcomputer CPU.
There is C. c: Other output capo-1- of pU includes Bri'-1
``lZ'', audio output device V ('; IJ and display circuit f-, +SI' are connected.Display circuit R,) SP is 4-pin 1-latch LAI.

I, Δ2 and I-7Δ3. Mardibrekna M I)
X, decoder L) EC, counter co I, f
It is composed of a ti driver DR1, a ceramic 1-driver DR2, and a 3-digit 7 ceramic 1 to a light emitting diode display 14. Microcomputer (,: +11
J and the display circuit Ds r” are n CIJ (Bjnar
y Coded city! There are four lines for passing the cimal signal and three lines for selecting the digit. Being self-centered. Latch LA ], .

The output signals of 1, △2, and Δ3 are multi-brake!
One of the following is applied to J-M rl
13C. Decoder 1) [EC is 13 C
L) Generate 7 sagmen 1~ signals from the signals. The output signal of decoder l) E C is sagmen 1-1-river 1
] is applied to R2. Driver DR to segment 1
2 is composed of seven sets of 1-herald transistors, and switches the cathode of each segment 1- of the light emitting diode display 14 to ground or open. Light emitting diode display @1
The common anode of each digit of 4 is connected to the digit driver DRI. The digit driver DR+ is composed of three sets of 1- transistors, etc., and in response to the signal from the counter COI,
The common anode of any digit of the display 14 is connected to a predetermined potential V.
Connect to cc. The counter COI is a ternary counter and converts the output signal of the oscillator O8C to 1-. That is, depending on the three states of the counter CO1, the voltage Vcc is applied to the anode of any digit of the display I4, and the output signal (display data) of any one of the latches LAI, LΔ2, and LA3 is applied. is selected and the decoder D′
EC and decoder 1. ) I': Predetermined segment 1- is grounded according to the output of C, and digit 1- driver []
Segment 1-, which is grounded by segment driver 2, of the digit selected by R1 emits light.

The general operation of heart rate measurement will be explained. First of all, 41 Susada Star!
Operate the switch 10 and grasp the conductor plates 5 and 6 on the steering wheel j with your left and right hands, respectively. Now, the electrical signal generated in the human body due to the pulsation is applied to the differential amplifier IJ FΔ. This signal is transmitted to the amplifier AM
It is amplified by I, and noise is removed by filter FL l. The signal passing through I·I,1 powers the light emitting diode rode indicator 13 through the amplifier ΔM2. Furthermore, a binary signal corresponding to the pulsation is generated at the output of the comparator CP1, and this is sent to the external interrupt input terminal I N ' of CI'IJ.
J”.

Mar(') c+ ] Nbuta c P , tJ l
el', the number of external interruptions within a predetermined period of time is counted to measure the heart rate. Note that the light emitting diode indicator 13 indicates the contact force peak state between the detector 5 (or 6) and the finger.

FIG. 3 shows an outline of the operation of the microcomputer CP (J) shown in FIG. 2.The operation of each step will be explained with reference to FIG.

81 Set the circuit to the initial state. That is, clear the internal memory, latch it, set "0" to Δ1, 1-A2 and 1, A3, turn off the buzzer BZ,
De-energize the light emitting diode indicators 11 and 12.

S2 Check switch XO and wait for it to turn on. Switch 10 is a start switch that instructs the start of heart rate measurement.

S3 The input channels of the A/D converter AlDC are set to O and 1, and the heart rate upper limit data and heart rate lower limit data obtained by A/D converting the voltages from the variable resistors VRI and VR2 are stored in registers M11 and ML, respectively. Set to . Note that the variable resistors VRI and V
R2 is set to a predetermined state by the driver in advance.

When the conductors 5 and 6 are touched with both hands, an analog signal corresponding to the beat is generated at the output of the filter FLI.

The level of this analog signal changes depending on the contact state between the finger and the conductive plates 5 and 6, so the examinee, that is, the driver, positions the finger so that the blinking brightness of the 1 light emitting diode indicator 13 becomes a predetermined state. and adjust the force of your fingers gripping the steering wheel.

87 Wait for a predetermined time To. The time ']゛0 is from when switch 7 or 8 is pressed to when the filter I''L, 1
It is the time required for the output of (i) to become stable.

88 Set variable S to 5 to cella 1. : This means that the heart rate is measured five times in a row.

S9 7. r Taro Computer Book C) Start U's internal timer and enable internal timer interrupts.

S10 Enable external interrupts, that is, interrupts caused by signals applied to the lower end of IN.

S11 Check whether switch 9 is pressed. Switch 9 is a cancel switch for skipping the heart rate 41 midway through.

Since the [SI2 cancel switch 5] has been pressed, interrupts are prohibited, the timer and memory of variables N and M are cleared, the display and instructions are reset to 1~, and the process returns to step S2.

S13 Compare the variable N with the time constant 'I'1. T
1 corresponds to the time of one heartbeat measurement. Variable N is heartbeat 1
It is cleared to 0 when starting the tll+ determination, and is incremented by 1 every time there is an internal timer interrupt in step S30.

S14 Calculate heart rate from variable M and store the result in register Mx. The variable M is cleared to 0 when heart rate measurement is started, and is incremented by one each time there is an external interrupt at the INT terminal in step S40.

S15 Read the contents of the register Mx that stores the heart rate, and latch it digit by digit LAI, LA.

This will output 7 segments 1- to L A 2 and LA 3.
The heart rate as a measurement result is displayed on the display 14 as a three-digit value.

816 Compare the contents of register Mx with the upper limit setting of register Ml+ and the lower limit setting of register M1.

S17 Since the heart rate is outside the preset range, the buzzer BZ is activated for 1 second to issue an R alarm.

S18 Controls the voice output device VGU and announces "Take a break."

S19 Disable interrupts, internal timer, memory Nt
? and clear the contents of M to 0.

820 variable S t5] Dedecrysin 1.
-S2+ Check whether the content of variable S is 0. If it is not 0, the process returns to step S9 and the heart rate is 4 again.
111 start.

S30 Increment variable N by 1-. When this process is finished, the process immediately returns to the original process.

S40 Variable M & increment by 1. When this process is finished, the process immediately returns to the original process.

Next, another embodiment will be described. Figure 4 shows f,
-1- The configuration of the electric circuit of the heartbeat 81 is shown. Referring to FIG. 4, in this embodiment, the light emitting diode j/° indicator 13. of the previous embodiment is used. Eliminate amplifiers AMI and ΔM2 and replace them with automatic gain control amplifier ΔG
This is provided. Therefore, even if the contact state between the hand and the numb body plate changes, the level fluctuation of the signal at the output end of the filter F1 is small, so that if:fK can be fixed at the heart rate of 8+11. In this example, the automatic gain control amplifier △
c C, light emitting diode r ode, sulfide power 1~mium cell (
It is constructed using a four-coupler PC made of CdS). In addition, in this embodiment, the variable resistor @VRI,
VR2 and Δ/D comparator A, discard one C IJ-L
, instead, there are 12 key switches KO,
Kl, 2°K3. 4. 5. 6. 7. 8. 9. KH and KL are provided. These key switches are used to set the upper and lower heart rate limits that determine whether or not an alarm is issued. The other configurations are the same as in the previous embodiment.

5a and 5b show the operation of the microcomputer CPU of FIG. 4. FIG. First, the operation will be explained with reference to FIG. 5d. The only difference between FIG. 5a and FIG. 3 is that step S50 and step 5100 are added. In step S50, the key switch ■(
0 to 9. Check whether KH and KL have been operated.

This is output capo-1-P4. One of P5 and P6 is set to low level L, the other port 1 is set to high level 11, and the port set to low level is sequentially changed at a predetermined period. During this time, the states of input ports r〕0 to P3 are changed. Read if one of those input ports is low level 1. If this is the case, it is determined that key personnel are present.

Step S I OO is the heart rate corresponding to the key operation.
: This is a blue routine to set the limit value and lower limit f1a.

The detailed operation of step 5100 is shown in Figure 5b.

Each step will be explained with reference to FIG. 5h.

S51 Check whether the pressed key switch is KI+.

S52 Key switch KH is pressed], so,
- Enter the input mode for the limit far (. First, set the variable N to 3, which corresponds to the number of input digits.

853 Wait for the next key switch to be pressed.

S54 Check whether the pressed key switch is 1<[I.

S55 The pressed key switch is 1. Check whether

S 56 Register lz n (N) according to variable N
Then, the one-digit number corresponding to the pressed key switch is stored.

S57 The key switch corresponding to the pressed key switch was pressed 1
The numerical value of the digit is displayed on the light emitting diode display 14.

858 Decrement variable N once from 1 to 1.

859 Check whether the content of variable N is 0.

The operation in the ``two-limit value input mode'' from step S53 is performed until N becomes 0.

S60 Check whether the pressed key switch is KL.

S61 Since the key switch KL has been pressed, the heart rate lower limit value input mode is entered. First, the variable N is set to 3, which corresponds to the number of input digits.

362 Wait for the next key switch operation.

S63 Check whether the pressed key switch is K11.

S64 Check whether the pressed key switch is KL.

S65 Register R, l-(N) according to variable N,
Slides the one-digit numerical value associated with the pressed key.

S Ei 6 The light-emitting diode display 14 displays the numeric value that corresponds to the pressed key switch.

S 67 Decrement variable N once.

868 Check whether the content of variable N is 0.

Continue step 5 (62 lower limit human duck-1 operations) until N becomes 0.

In the embodiment described above, the conductor is connected to a pair of conductor plates.
6 and 6, and these are provided only on a part of the steering wheel, but the conductor plates may be provided in two or more pairs, or the conductor plates may be provided on the entire surface of the steering wheel or on the spokes supported on the steering pole. It may be provided in some parts.

By the way, the period of each pulsation changes over a short period of time. For example, as shown in Figure 6, the circumference 1 ul at a certain point is 1
-4l, the next circumference R11 changes to l-72.

The degree of this periodic change, that is, the variation, is closely related to a person's level of tension. Table 1 below outlines the relationship between the average heartbeat cycle and the variation Δl of the heartbeat cycle, and a person's physical and mental state.

Table 1 Generally, when driving a vehicle, one is physically relaxed and mentally tense.

However, when the driver falls asleep while driving due to fatigue or the like, the mental tension disappears and the heart rate returns to the state during sleep. In other words, referring to Table 1, 11 (if you start falling asleep while driving the car, the variation in the heartbeat cycle will suddenly increase. Therefore, in the next example, the variation in the heartbeat cycle Also monitor drivers and take measures to prevent drowsy driving.

FIG. 7 shows an electric circuit of another embodiment of the present invention. The configuration of this circuit will be explained with reference to FIG. 7. The configuration of this circuit is the same as the circuit shown in FIG. 2 above, except that the connections of variable resistors VRI and VR2 are changed. In this embodiment, variable resistor VRI is used to set a negative limit on heart rate, and VR2 is used to set an upper limit on heart rate period variation.

FIG. 8 shows the operation of the microcomputer CPU shown in FIG. 7, and FIG.
The timing of the signal applied to N'F and the operation of CI'U is shown. The operation of each step in FIG. 8 will be explained with reference to FIGS. 8 and 9.

81 Initialize the circuit Jl! Let it be. That is,
Open the contacts of relays R, L, I and R+, 2, set Rano (1, AI, 1.A2 and L7Δ3 to 0), de-energize the buzzer 132, and turn on the light emitting diode 11 and 12 are deactivated.

S2 Check switch 10 and wait for it to turn on. The switch 10 is a star 1 switch that indicates the heart rate measurement star.

S3'A/'I) Connect the input channels of converter 8 C to 0, 9 and 1, and connect them to Iij transformer V.
The upper limit data of the heart rate and the second limit data of the heart rate cycle variation obtained by converting the voltage from 1 to 2 to Δ/1 by RI are stored in registers M11 and Vll, respectively.
do.

87 Wait for a predetermined time of 1'0. The time T o is the time required for the signal level of the output of the detector DT+ to become stable after the switch 7 or 8 is pressed.

S8 Set 5 to variable S. This means that heart rate measurements are performed five times in a row.

89 Microcomputer CI] Starts the internal timer of U and enables internal timer interrupts.

Allows an SIO external interrupt, that is, an interrupt by a signal applied to the INI' terminal n5.

Check whether Sll switch 9 is pressed. Switch 9 is a cancel switch for stopping the heartbeat 11111 midway.

812' Since the cancel switch 9 was pressed, interrupts are disabled and the timer, variables N, MV, and Vd are set.

Clear the memories of No, Mn and Mo, change the display and instructions to resellers 1 to 1, and set relays J, 2. r-] and R
1 and 2 are set to "open", and the process returns to step S2.

S+3 Compare the variable N with the time constant 1' I. 1
1 corresponds to the time for one heartbeat measurement. The variable N is cleared to O when the heartbeat 11111 measurement is started, and is incremented to 0 every time there is an internal timer interrupt in step S30.

S1/I Calculates heart rate from variable M and stores the result in register Mx. Variables 6 to 1 are cleared to 0 when heart rate measurement is started, and I N in step s40.
-r is incremented by one each time there is an external interrupt at the lower end.

S+5 Reads the contents of the register Mx that stores the heart rate and outputs it to the latches I-Δ1.T, Δ2 and 1.A3 one digit at a time. AI that displays heart rate as a 3-digit number
,ru.

S ] 6' Transfer the contents of register Mx to register M
Compare with the 11 limit setting value of 1.1.

S23 The contents of register V are compared with the heartbeat cycle variation upper limit set value of register Vd. As will be explained in detail later, the register ■ contains M after starting the timer.
The maximum value of the heartbeat cycle variation until nD'1M has passed is stored.

S17 Since the heart rate is outside the preset range, buzzer BZ is activated for 1 second to issue an alarm.

S18 Since the heart rate is greater than the value set in VRI and the variation in the heartbeat cycle is greater than the value set in VR2, it is determined that the driver is drowsy, and the audio output device VGU is controlled. "Take a break," he announces.

819' interrupt is disabled, internal timer, memory N, M
, V, Vd, No, Mn and Mo are cleared to 0.

S20 Decrement the variable S by one.

S21 Check whether the content of variable S is O.

If it is not 0, the process returns to step S9 and starts heart rate measurement again.

822 Deenergizes light emitting diode indicators 11 and 12 and relays 1.2. Connect the contacts of LI and RL 2 to
OPEN" and return to step S2.

S 3 (l Increment the variable N by 1. When this process is finished, immediately return to the original process.

When the input terminal INT of CP[,] goes to low level L, 4], an external interrupt is generated, and step 540a receives the input terminal INT1-4].
Lee.

S 4 Q a Check the contents of register M. At the time of the first external interrupt, the contents of M are set to 0, and each time the external interrupt speed is applied, the contents of M are incremented in step 540j.

S 40 h Contents of register ■ Sera 1-shi in KO,
The contents of register N at that time are stored in register N0. This processing is performed when the contents of register M are 0 and 1, that is, at the time of the first external interrupt and the second external interrupt.

s/l O,: Checks whether the content of register M is 1.

S 4 F,'l (I Since the second external interrupt is being processed, 1 stores the value of N - No in the register M n.

540e After storing the contents of register Mn in register Mo, store the value N - No in register Mn.

540f Store the contents of register N in register No.

840g Store the value of M n -M o in the register Vd. Before starting this process, register MO stores the number of internal timer interrupts that have occurred from the time before the previous external interrupt occurred to the previous external interrupt, that is, the previous heartbeat cycle, and register Mn stores the previous heartbeat cycle. The number of internal timer interrupts that have occurred from the time an external interrupt occurs until the current external interrupt occurs, ie, the current heartbeat cycle, is stored. Therefore, register V
The difference between the previous heartbeat cycle and the current heartbeat cycle, that is, the change (variation) in the heartbeat cycle is stored in d.

S 40 h Compare the contents of register Vd and the contents of register ■.

540i Since the current heartbeat cycle change is the maximum value up to that point, the fla of register Vd is stored in register V (~-
To do so.

540j Increment the contents of register M by -r.

In the embodiment shown in FIG. 8, the variations in heart rate and heart rate cycle are set by + + J variable resistor f + VR, ] and VR2, but this data is stored in advance in 1. ! It may be recorded in the OM, or it may be set using a key switch as shown in FIG.

FIG. 10 shows the operation of a modified embodiment of the embodiment described in -.

In the embodiment shown in FIG. 10, the interrupt processing is the same as in FIG. 8 (=-). This will be explained with reference to FIG. In this embodiment, the star] switch is omitted and there is a +n3 br-r,
Car-1-heartbeat R1 always measures the driver's heartbeat. The added operation steps are 'S24. S25, S2
G, S 27 and 828. F is i41 last time
'l This is a flag to remember what the regular heartbeat was in a foreign country. When Zunaji detects an abnormality in the first heart rate measurement, it executes steps S17 and S+8 and sounds the buri 1- for 1 second and outputs a voice saying "Take a break." If the heart rate measurement is also abnormal, flag F is set to 1, so step S25 is executed and the buzzer sounds for 10 seconds. Therefore, if the driver falls asleep at the wheel, until the driver wakes up,
In other words, the alarm will be issued until the patient becomes mentally tense and the variation in heart rate cycles becomes smaller. This can prevent drowsy driving.

As described above, according to the present invention, the heart rate 'd11 can be determined without taking the driver's hand off the steering wheel, so the heart rate can be safely measured while driving the vehicle.

[Brief explanation of drawings]

Figure 1a is a front view showing the vicinity of the steering wheel of three types of automobiles implementing the present invention, Figure 11) and Figure 1.
Figure c is an enlarged sectional view taken along line Ib-Ib and line 1c-1c of Figure 1a, respectively. Figure 2 is a block diagram showing the configuration of the electric circuit of the device shown in Figure 1a. 2 is a flowchart 1- showing the operation of the microcomputer crlu shown in FIG. 2; FIG. 4 is a block diagram of an electric circuit according to another embodiment of the present invention, and FIGS.
It is. FIG. 6 is a waveform diagram showing an example of an electrocardiogram waveform, FIG. 7 is an electrical block diagram of another embodiment of the present invention, and FIG. 8 is a flowchart 1-1 showing the operation of the microcomputer in FIG. 7. FIG. 9 is a timing chart 1-1 showing the timing of the operation of (I' [signal waveform at the lNi' end of J and CI) tJ. FIG. 10 is a flowchart showing a modification of FIG. 8. 1: Steering wheel 2, 3 varnish board 4: Center pad 5, 6: Conductor plate (conductor) 9. 10: Switch 1: 3 dual light emitting diode indicator (1llllll constant f display means) 14: 7 segment l-Light emitting diode-1・"Indicator (': l]IJ: Microcomputer (control means) VC,: 1.J: Tf 7"T Output %
P? (Performance!lit'-(output means) 13Z: Buzzer (W
Information means) 1,) S +): Display circuit (calculated value output means) ΔM
+, ΔM2: Amplifier C11+: Comparator Δ(,;
<: :Automatic gain control amplifier PC: Photo cutter Figure 5b Figure 6 Figure 9

Claims (8)

[Claims] (1) at least two conductors disposed on the steering wheel poles, spokes or steering wheel operation board; switch means for instructing the start of heart rate measurement; responsive to a change in the state of the switch means; A control means that detects a change in the potential difference between the conductors and calculates a value corresponding to the number of changes or the period of change within a predetermined period of time; and display and sound according to the calculated value output from the control means. Calculated value output means for performing at least one of the outputs; (2) The control means includes an alarm means that compares the calculated value with a preset value and issues an alarm if the calculated value is outside a predetermined range. 's car' two heartbeats 1° (3) The control means displays a measurement condition according to the potential difference between the conductors. The on-vehicle heart rate IT according to claim (1), which includes a small display means. (4) The two conductors are on the steering wheel.
The on-vehicle heart rate monitor according to claim 1, wherein the on-vehicle heart rate monitor is arranged symmetrically with respect to the steering wheel rotation axis. (5) at least two conductors disposed on the operation board of the steering wheel boiler, spoke or steering wheel; detecting fluctuations in the potential difference between the conductors; detecting the number of fluctuations per predetermined time or the period of the mechanism fluctuation; and a control means for calculating a value corresponding to a change in the fluctuation period; and a calculation value output means for performing at least one of display and audio output according to the calculation value output from the control means;゜ (6) The control means compares the calculated value with a preset value, and determines whether the calculated value is outside the predetermined range. ; Claim No. 5, comprising a 'fox emitting a warning' warning means.
On-vehicle heart rate d1゜ stated in section (7) The control means determines whether the potential difference between the conductors changes within a predetermined period of time. I! If the +1 number of times is less than a predetermined value and the fluctuation period of the potential difference is thicker than a predetermined value, an alarm is issued.rl
'l tit! Vehicle-1 described in claim (6)
- Heart 41+il. (8) The control means calculates the value corresponding to the maximum change in the period between the potential difference change cycles between the conductors,