JP2816977B2 - In-car display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] In the present invention, the operation status of a brake petal, the depression degree of an accelerator petal, the degree of the engine speed, and other driving conditions are displayed in the interior of an automobile. The present invention relates to an in-car display device.

[Conventional technology]

Outside the vehicle, there are generally tail lamps to notify the following vehicle that the brake pedal has been depressed, and turn indicators to notify the following vehicle and oncoming vehicles in advance when changing lanes or when turning left and right. A display device is provided. Further, there has been proposed a display device configured to notify a following vehicle or the like of the degree of depression of an accelerator petal.

[Problems of the prior art]

By the way, while driving on a curved road such as a mountain road with a bus or taxi, or running on uneven roads, "How much speed is now going?" Or "Isn't it likely that sudden braking will be applied?" Anyway, the driving situation of the car is often worrisome. However, the display device as described above informs the outside of the vehicle of the driving condition, and cannot be seen from inside the vehicle. For this reason, people inside the car other than the driving car can estimate the driving situation of the car from the shaking and movement of the car, and can only understand it vaguely, but can not grasp the driving situation clearly Was.

[Object of the invention]

An object of the present invention is to provide an in-vehicle display device that allows a person in a vehicle to easily know the driving and driving conditions of the vehicle in view of the conventional disadvantages.

[Gist of the invention]

According to the present invention, there is provided an in-vehicle display device having display means for displaying, in the interior of a vehicle, an operation state of a brake petal, a degree of depression of an accelerator petal, a degree of an engine speed, and other driving conditions. This can be achieved by:

〔Example〕

 Hereinafter, an embodiment will be described with reference to the drawings.

FIG. 1 is a block diagram of the in-vehicle display device of the present invention. In the figure, a microprocessor unit (hereinafter referred to as a microprocessor unit)
Reference numeral 1 denotes a so-called one-chip microprocessor having a CPU, a RAM, a parallel input / output port, a timer, a clock oscillation circuit, and the like. A program executed by the MPU 1 is written in a ROM 2, and the ROM 2 is electrically connected to the MPU 1 via a data bus, an address bus, and the like.

A drive pulse is supplied from one of the output ports of the MPU 1 (hereinafter referred to as a sensor drive bit) to a sensor 3 for detecting the pedaling of an accelerator petal or a brake petal. The detection output of the sensor 3 is supplied to a comparator 5 via a rectification and smoothing detection circuit 4.
The output of the comparator 5 is supplied to one (one bit) of the input ports of the MPU 1.

On the other hand, for example, 9 bits of the output ports of the MPU 1 are connected to the controller 6,
Is supplied to the comparator 5 as a reference voltage.

The controller 6 has a plurality of resistors, switching elements and the like as shown in FIG. 3 to be described later. The switching elements are selected by the MPU 1 and variously change the reference voltage of the comparator 5.

The other output port of the MPU1 is supplied to a driver 7,
The output of the driver 7 is supplied to a display 8. Note that the crystal oscillator 9 is provided for clock oscillation.

FIG. 2 is a circuit diagram showing a detailed configuration of the sensor 3. In the figure, the sensor 3 constitutes a parallel resonance circuit of a coil 10 and a capacitor 11, a terminal B is connected to the detection circuit 4, and the output of the sensor drive bit of the MPU 1 is connected to a resistor 12 from a terminal A. The parallel resonance circuit is supplied to the parallel resonance circuit. The terminal C is kept at the ground potential.

The coil 9 is formed in a flat shape having a diameter of about 10 cm, and is wound with a formal wire having a diameter of about 0.6 mm about 30 times, and the capacitor 11 and the resistor 12 are attached, and the whole is integrally united with, for example, acrylic resin. It is. Then, this is adhered to a floor surface or the like below the accelerator petal with an adhesive or fixed with an appropriate fixture, and a lead wire drawn from the coil 9 is connected as shown in FIG. . Said
The MPU 1 generates a rectangular wave of about 5 KHz by a program, and this is supplied from the sensor drive bit of the MPU 1 to the parallel resonance circuit.

FIG. 3 is a circuit diagram showing an example of a detailed configuration of the controller 6. In the figure, the resistor R ₀ through resistor R ₁
R ₉ and switching elements S _{1 to} S ₉ such as transistors and FETs
Is grounded (connected to the negative power supply terminal).
Each control terminal of the switching element, for example, the gate is
By setting any one of the output ports P _{1 to} P ₉ of the MPU ₁ to “H” level, any one of the resistors R _{1 to} R ₉ is selected, and the resistor R ₀ and the resistors R _{1 to} R ₉ are selected. A divided output with any one of R ₉ can be obtained at terminal E. Terminal D
A voltage stabilized by, for example, a Zener diode or the like is supplied between and ground. The voltage generated at the terminal E is the first
The reference voltage is supplied to the comparator 5 shown in FIG.

FIG. 4 is a circuit diagram showing an example of a detailed configuration of the driver 7 and the display 8. In the figure, the driver 7 is constituted by the transistors Tr ₁ to Tr _9, or other output port P ₁₀ of the corresponding through any one MPU1 of the base of each transistor resistors R ₁₉ to R ₂₇ Light emitting element L via corresponding one of P ₁₈
It is connected to one terminal of any one of ED1 to LED8. Then, these light emitting elements LED1 to LE
The other terminal of D8 is connected to a plus terminal of a power supply (not shown) via a corresponding one of the light emitting elements LED10 to LED17.

The operation of the in-vehicle display device of the present invention configured as described above will be described below.

The drive signal of the sensor 3 is formed into a rectangular wave of about 5 KHz by executing a timer interrupt routine or the like, and is supplied to the parallel resonance circuit. As a result, the sensor 3 outputs a sine wave signal which becomes maximum at the resonance frequency due to the flywheel effect, and the sine wave signal is rectified by the diode (not shown) of the detection circuit 4, and the rectified output is not shown. The signal is smoothed by a filter or the like and becomes almost a DC voltage, which is input to the comparator 5 as a signal to be compared.

On the other hand, the MPU 1 operates the controller 6 by executing another program. With reference to FIG. 3, for example, an output port P ₁ of the first the output port P ₁ to P ₉ "L"
Change from level to “H” level. Then, since the switching element S ₁ is turned, the terminal voltage of the resistor R ₁ is supplied as a reference voltage to the comparator 5. The output of the comparator 5 is supplied to the input port of the MPU1, and the MPU1 checks whether the input state of this input port has changed from "L" level to "H" level, for example.
If no changed back to the output port P ₁ to the original "L" level, this time, to change to "H" level output port P ₂ from the "L" level, the as well as the MPU1 is the input Check the port status. Still unless Hen' the state of the input port back to the output port P ₂ to the original "L" level, and changes to "H" level output port P ₃ from the "L" level, the MPU1 is the input Check the port status. Such operations are sequentially repeated until the output port P ₉ or later. Then, returning again to the operation of the output port P _1, the operation is repeated. The time required for one cycle of such operation is about 500 μs.

The operation is performed such that the reference voltage of the comparator 5 changes stepwise from a high voltage to a low voltage.
If the changes to the "H" level from the output "L" level state, that the comparator 5 of the input port, which is what is in the "H" level of the output port P ₁ to P ₉ is is determined, which with any whether to "H" level of the output port P ₁₀ to P ₁₈ are outputted to the driver 7 is determined on the basis of this, it is executed as such.

For example, in a state where the sensor 3 is fixed below an accelerator petal or a brake petal, the signal to be compared by the comparator 5 becomes maximum when the accelerator petal or the brake petal is not stepped on. Or the resonance frequency of the parallel resonance circuit is determined in advance. Then, the difference between the voltage of the compared signal and the maximum voltage when the accelerator petal or the brake petal is fully depressed is obtained. The resistances R _{0 to} R _{9 of the} controller 6 are determined so as to be supplied as a reference voltage to the comparator 5. For example, if the maximum voltage is 5 V and the voltage of the compared signal when the accelerator pedal and the brake petal are fully depressed is 0.6 V, the difference is 4.4 V. Therefore, 4.4 V as a reference voltage to the comparator 5 by the operation of the output port P ₁ to P _9, 3.91V, 3.42
V, 2.93V, 2.44V, 1.96V, 1.47V, 0.98V, and 0.49V are sequentially supplied. If a voltage corresponding to a state where the accelerator petal or the brake petal is depressed most, that is, 0.6 V is supplied as the compared signal, the controller 6 is sequentially operated as described above, and eventually. , the reference voltage of 0.49V the output port P ₉ becomes "H" level to the comparator 5 is supplied. As a result, the voltage of the compared signal of the comparator 5 becomes higher than the reference voltage, and the output of the comparator 5 changes from “L” level to “H” level. Thus, the MPU1 is the "H" level from P ₁₀ to P ₁₇ of the output port for outputting to the driver 7. Accordingly, when the accelerator petal and the brake petal are fully depressed, all of the green LEDs 1 to 17 except the LED 9 in FIG. When the accelerator petal or the brake petal is slightly depressed, for example, when 4.2 V is supplied as the signal to be compared, the output port P ₂ goes to “H” level and the comparator 5 When a reference voltage of 3.91 V is supplied, the output of the comparator 5 becomes "H" level. As a result, the MPU 1 sets only the output port P ₁₇ for outputting to the driver 7 to the “H” level. Therefore, in this case, the LEDs 8 and 10 in FIG. 4 are turned on. Note that this LED9 is the output port P ₁₈ is "L" level to turn off to when being depressed i.e. the accelerator pedal and the brake pedal when lighting the other the LED. Further, in the above embodiment, the light emitting element is constituted by the LED, but may be constituted by an incandescent lamp.

The above is an example of the case where the degree of operation of the accelerator petal or the brake petal is detected and the degree of their operation is displayed, but the degree of the engine speed can be displayed by slightly changing the configuration. . For example, instead of the sensor 3 configured by the parallel resonance circuit, a vibration sensor such as a microphone or a pickup is provided at an appropriate place in an engine room, and the output of the vibration sensor is detected by the detection circuit 4.
To enter. In this case, needless to say, it is unnecessary to supply a rectangular wave from the sensor drive bit to the sensor. Therefore, there is no need to create the rectangular wave. The operation is almost the same as the case where the accelerator pedal and the brake pedal are detected and the degree of operation thereof is displayed.

As the sensor 3, various sensors can be used in addition to the sensor using the parallel resonance circuit as described above. For example, a combination of a rack and a pinion converts a reciprocating motion associated with the operation of an accelerator petal or a brake petal into a rotary motion, and interlocks a rotation shaft of a rotary encoder with the rotation of the pinion, and outputs a digital output indicating a state of the rotational transition. May be read by the MPU connected via the interface, and the display 8 may be controlled accordingly. Also, as shown in FIG. 5, a vibrator 14 such as a speaker that generates an ultrasonic wave below the accelerator petal 13 and the brake petal, and is reflected by the lower surface of the accelerator petal 13 and the brake petal emitted from the vibrator 14. A vibrating body 15 such as a microphone for receiving ultrasonic waves to be received is provided, and during operation, the reflected ultrasonic waves accompanying the contact and separation of the accelerator pedal 13 and the brake pedal with respect to the vibrating body 15 and the vibrating body 14 are provided. Can be captured by the vibrating body 15 and the display 8 can be controlled by the MPU 1 or the like in the same manner as described above. Further, the vibrating body 14 and the vibrating body 15
Instead of using, for example, a reflective photo-interrupter, a white reflective paper is adhered to the lower surface of the accelerator petal 13 or the brake petal or a white paint is applied, and the same configuration as described above is performed by the reflected light. You can also. Also, a spring or a resilient member such as a spring is fixed to the accelerator petal or the brake petal, and a pressure corresponding to the operation of the accelerator petal or the brake petal is applied to a pressure sensor, for example, a strain gauge, and the output of the pressure sensor is configured. , The display 8 can be controlled in the same manner as described above. When these sensors are used, there is no need to supply a rectangular wave from the sensor drive bit to the sensors. Therefore, there is no need to create the rectangular wave.

In the above-described configuration, the display of the operation degree of the accelerator petal, the display of the operation degree of the brake petal, the display of the degree of the engine speed, or the display in which two or more are combined as appropriate, or the entire display is performed. Inside a car,
For example, it is provided at a place that is easy to see from the back seat of the taxi, or at one or several places that are easy to see from the passenger seats of the bus.

FIG. 6 is a schematic configuration diagram showing another embodiment, and FIG. 7 is a schematic side view of a principal part thereof. A rocking plate 17 pivotally supported at an end of the support member 16 is provided in the vicinity of the accelerator petal 13, and a lower portion of the rocking plate 17 is positioned so as to contact an upper end of a lower surface of the accelerator petal 13. . On the other hand, a thin wire rope 18 is fixed to the front end of the rocking plate 17, and the other end of the wire rope 18 is attached to a spring member 19.
The other end of the spring member 19 is locked by a locking member 22 fixed to the vehicle body 20. In addition, the wire rope 18
In the vicinity of the connection portion with the spring member 19, a variable slideable variable resistor 23 as the sensor 3 is provided as a support member 24.
The adjustment rod of the variable resistor 23 is fixed to the wire rope 18.

Thus, when the accelerator petal 13 is depressed, the contact portion of the rocking plate 17 is pressed by the upper end of the accelerator petal 13 so that the rocking plate 17 rotates about the pivotal support. Displace. As a result, the upper end of the rocking plate 17 is displaced in the lifting direction, and accordingly, the wire rope
18 also moves. Therefore, the adjustment rod of the variable resistor 23 is displaced in conjunction with the movement of the wire rope 18 to change its resistance value. Although a slide type variable resistor is used in this embodiment, a variable rotation type variable resistor may be used in combination with a mechanism for converting reciprocating motion to a recovery motion, such as a mechanism using the rack and pinion. it can. In FIG. 6, a brake petal 25 is provided on the left side of the accelerator petal 13, a clutch petal 26 is further provided on the left side thereof, and a seat 27 is shown on the near side, and a door pocket 28 is provided on the right side thereof. It is shown.

The electronic circuit to which the variable resistor 23 as the sensor is connected is the same as that shown in FIGS. 1, 3 and 4, or can be used almost as it is with a slight modification. In the example, the electronic circuit shown in FIG. 8 was used. In the figure, a 12-element LED driver IC
(Hereinafter abbreviated as driver IC) 29 is an IC with a built-in comparator, matrix circuit, LED driving amplifier, etc.
It is generally commercially available as a bar graph display or the like which can be substituted for a VU meter of an audio amplifier (for example, IR-2433 manufactured by Sharp Corporation). Although 12 elements are shown in the figure, more elements can be finely driven by cascading the driver ICs 29. The output of the driver IC 29 is
12 and LED is connected to a display 30 having a built-in, pin 2 is pressed the power V _CC by the resistors R ₂₈ and variable resistor V _R to supply the maximum value of the reference voltage of the built-in comparator min Settings doing. The twentieth pin is set by dividing the voltage of the power supply V _CC by resistors R ₃₀ , R ₃₁ , and R ₃₂ so as to supply the minimum value of the reference voltage of the comparator, and setting the voltage drop of the resistor R ₃₂ . In this way, by setting the maximum value and the minimum value of the reference voltage, the interval between them is divided into 12 equal parts, which are supplied to each of the built-in comparators. Pin 3 is a terminal for controlling the current flowing through the LED of the display 30 is adjusted to set the resistor R _30, R _31, R ₃₂ as appropriate. The LED may be configured to emit yellow light at the left end and green light at the other end.

Although not shown in FIGS. 6 and 7, the variable resistor
As shown in FIG. 8, the power supply V _CC is supplied to the resistor 23 via a resistor R _33, and a voltage that varies with the movement of the adjusting rod is output from its selecting terminal. It is supplied to the 21st terminal of the driver IC29. Then, as the output voltage changes from low to high, the light emission extends from the left side to the right side of the display 30. In addition, if the display 30 is provided on the left and right, and each LED is driven two by two, the light is seen to extend to both ends as the step on the accelerator petal is stepped on the basis of the center. can do. When realizing such a configuration, if the drive power of the LED becomes insufficient, it is preferable to drive the LED after amplification with an appropriate amplifying element such as a transistor.

In the above description, the operation degree of the accelerator petal is displayed. However, if a similar configuration is provided on the brake petal side, the operation degree of the brake petal can be displayed.

Further, instead of the configuration of the variable resistor 23 and the resistor R _33, as described above, the sensitive vibration sensor such as a microphone or pickup provided if appropriate the engine room, the output of the sensitive vibration sensor and the detection circuit 4 If the power is supplied to the 21st terminal of the driver IC 29 via a similar detection circuit, the degree of the engine speed can be displayed.

Also in this configuration, the display of the degree of operation of the accelerator petal, the display of the degree of operation of the brake petal, the display of the degree of the number of revolutions of the engine, or a display in which two are combined as appropriate or all the displays are performed. Inside a car,
For example, it can be provided at a place that is easy to see from the back seat of the taxi, or at one or several places that are easy to see from the passenger seats of the bus. Then, for example, when the display of the operation degree of the accelerator petal and the display of the operation degree of the brake petal are combined, for example, the color is different from the green or yellow in the case of the accelerator petal, and the red light emission is A display extending in accordance with the degree of depression may be provided along with the display of the operation degree of the accelerator petal.

The display of the degree of operation of the brake petal in each of the above configurations is such that light emission is extended as the step on the brake petal is stepped on, but the switch which is closed when the brake petal is depressed more easily is described above. It is also possible to dispose it near the brake petal and display it only to light up when the switch is closed. Further, it may be provided in addition to one or both of the display of the operation degree of the accelerator petal having the above configuration and the display of the degree of the engine speed.

Further, by combining the above-described configuration with a sensor such as a rotary encoder that is interlocked with the movement of the steering wheel, the degree of the curve of the vehicle can be displayed, and these displays may be provided together.

FIG. 9 is a plan view of an essential part showing an example of a display body provided in the in-vehicle display device of the present invention. In the figure, a display body 31 is formed in a flat rectangular parallelepiped of, for example, a metal material or a plastic material, and houses a printed circuit board in which a large number of light-emitting elements, for example, high-brightness type LEDs are arranged. The upper half area of the display body 31 above the center in the longitudinal direction is a display section 32 for displaying the pedaling degree of the accelerator pedal, and the lower half area is a display section 33 for displaying the degree of engine speed. There is. In addition, a substantially petal area is provided at a substantially central portion of the display body 31, and a brake petal operation display section that emits light when the brake petal is depressed there.
34. The light emitting element provided in each display unit is connected to the driver 7 shown in FIG. 4 described above, or the driver IC 29 shown in FIG. The output of the driver IC 29 is driven after amplification by an amplifying element such as a transistor. Thus, as the brake pedal is stepped on, and as the engine speed increases, the light emission changes in the order of a, b, and c in FIG. put out. In the case shown in FIG. 9,
Although not shown, a switch that is closed when the brake petal is stepped on is disposed near the brake petal, and is displayed only when the switch is closed.

〔The invention's effect〕

As described in detail above, according to the present invention, the driving state such as the operation state of the brake petal, the degree of depression of the accelerator petal, or the degree of the engine speed is displayed in the vehicle. People in the car other than the driver can clearly understand the driving situation, and when speed is high, it is possible to deal with danger in advance by holding onto a handrail, backrest, etc. without significant shaking . Therefore, contributing to traffic safety is enormous.

[Brief description of the drawings]

FIG. 1 is a block diagram of an in-vehicle display device of the present invention, FIG. 2 is a circuit diagram of a sensor, FIG. 3 is a circuit diagram of a controller, FIG. 4 is a circuit diagram of a driver and a display, FIG. FIG. 6 is a schematic diagram showing an example of configuring the present invention using ultrasonic waves. FIG. 6 is a schematic diagram showing a state around an accelerator pedal in another embodiment. FIG. FIG. 8 is a schematic side view of an essential part in the embodiment of the drawing, FIG. 8 is a circuit diagram showing an electronic circuit in another embodiment, and FIG. 9 is a plan view of an essential part showing an example of a display body. 1 ... MPU, 2 ... ROM, 3 ... Sensor, 4 ... Detector circuit, 5 ... Comparator, 6 ... Controller, 7 ... Driver, 8 ... Display, 13 ... Accel petal, 19 ... Spring member, 23… Variable resistor, 29… 12 element LED driver IC, 30… Display.

Claims (3)

(57) [Claims] And a display means for detecting a driving state of the vehicle, based on an output of the sensor, for displaying the driving state of the vehicle in a light-emitting state. A comparator for comparing a signal input to one input terminal with a reference voltage input to the other input terminal, and adjusting and converting an output signal of the sensor and outputting the signal to one input terminal of the comparator A detection circuit that inputs a signal, a controller that supplies a reference voltage to the other input terminal of the comparator, a control signal that is output to the sensor based on an output signal of the comparator, and determines a reference voltage of the controller. Outputting a control signal to the controller, further comprising a microprocessor for generating driving condition data, and a plurality of transistors; A drive circuit for generating display data from the rolling driving condition data, vehicle display device characterized in that it is composed of a display device performing a display based on the display data generated by the drive circuit. 2. The sensor according to claim 1, wherein the sensor detects at least one of accelerator pedal depression, brake pedal depression, and engine speed.
In-car display device. 3. The display device according to claim 1, wherein the accelerator pedal has a pedaling degree,
2. The in-vehicle display device according to claim 1, wherein at least one of the pedaling degree of the brake pedal and the engine speed is displayed.