JPS5950543B2 - Vehicle warning display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle warning display device that displays normal abnormalities in various parts of a vehicle such as an automobile.

Devices that detect the status of various parts of an automobile, such as whether the amount of engine oil is appropriate or inappropriate, whether the radiator cooling water temperature is normal or abnormal, and display warnings, have been commercialized under names such as OK monitors and are becoming widely used.

There are various display methods for such warning display devices, but a method that uses a common display window and sequentially displays the name of each part in which an abnormality has been detected is not suitable for the size of the display device. It has the advantage of being able to display large images.

However, in this method, the display blinks, and the display for one abnormal location disappears after a predetermined time and the next abnormal location is displayed, so some users may not like it.

Therefore, in the present invention, the display does not blink and displays only one location where an abnormality has been detected.If an abnormality is detected at multiple locations at the same time, priority is given to the abnormality display of each part of the vehicle. It is now possible to display one item with a high degree of accuracy.

A plurality of sensors arranged in each part of the vehicle of the present invention,
a plurality of voltage dividing circuits connected to the output of the sensor and generating a voltage having a voltage value pre-assigned to the abnormality detection sensor as the sensor output when an abnormality is detected;
a changeover switch having a plurality of fixed contacts connected to each voltage dividing circuit, a movable arm whose one end is a common contact and whose other end is switched and connected to each fixed contact; a drive means for the movable arm; A maximum voltage output circuit using a diode that outputs only the highest output voltage of the contact, and a comparison circuit that compares the output voltage of the circuit with the movable arm output voltage and operates the driving means while the latter is lower than the former. and the display mechanism is simultaneously driven by the driving means. FIG. 1 shows a basic form of the warning display device according to the present invention,
~3 is a changeover switch S with sensors placed in each part of the vehicle.
They are connected to fixed contacts #1 to #3 of W, respectively.

These fixed contacts further include resistors 12.13, 14.
A voltage dividing circuit consisting of resistors 15 and 16 and 17 is connected, and a voltage obtained by dividing the voltage Vcc is applied.

The voltage dividing ratios of these voltage dividing circuits are different, and are set in advance so that a high voltage is applied to a fixed contact connected to a sensor with a high priority.

In this case, the divided voltage 1, V2, v3 by the resistors 12, 13, 14, 15, 16, and 17 is set.

Fixed contacts #1~#: ], 1m is also a diode 4~
6 are connected, and these are further connected to one input terminal of a differential amplifier 8 via a conductive wire 12.

The other input terminal of the differential amplifier 8 is connected to the movable arm A of the changeover switch SW, and the output terminal is connected to the oscillator 9.

The output of the oscillator 9 is amplified by the amplifier 10 and then energizes the plunger 11 that drives the movable arm of the changeover switch SW.

Further, an inverter 7 is connected to the conducting wire 12, and an output terminal of this inverter is connected to a fixed contact #0 of the changeover switch SW.

To explain the operation, sensors 1 to 3 close their contacts if there is no abnormality, and therefore fixed contacts #1 to #3 are grounded and at zero voltage.

Therefore, the inverter 7 produces an output of "1" and the voltage V.

(V.<V3) is applied to fixed contact #0.

The oscillator 9 stops oscillating when the voltage Vi of the movable arm A is equal to or higher than the voltage Vd of the conductor 12, that is, Vi≧Vd, and when Vi < V
Oscillation starts at d.

Therefore, assuming that sensors 1 to 3 have not detected any abnormality and movable arm A is in contact with fixed contact #2, differential amplifier 8 receives input voltage Vi = Vd = 0, and oscillator 9 stops oscillating. However, if an auxiliary circuit (not shown) is used, movable arm A contacts fixed contact #0, and Vi >
The oscillator 9 stops oscillating due to Vd, and therefore the movable arm A is also stopped on the fixed contact #0.

To briefly explain the auxiliary circuit, the auxiliary circuit applies a small positive bias voltage to the voltage Vd of the conductor 12 to the extent that the inverter 7 does not invert and is lower than the 1 output of the inverter 7, and detects no abnormality, and when movable arm A is connected to any of sensors 1 to 3, the oscillation condition of Vi < Vd is satisfied and the oscillator 9 is operated to connect movable arm A to fixed contact #0. It is a circuit (converting the stop condition Vi≧Vd when #0 is connected to
2 and ground.

In this state, for example, when sensor 1 detects an abnormality and opens its switch, voltage V1 appears at fixed contact #1 and through diode 4 to conductor 12, and Vi < Vd, and oscillator 9 starts oscillating. do.

This causes the electromagnetic solenoid 11 to connect the movable arm A to the fixed contact #.
Move to 1.

At this point, Vi=Vd, the oscillator 9 stops oscillating, and the movable arm A stops on the fixed contact #1.

At this time, even if another sensor, for example 2, detects an abnormality and opens its switch, generating voltage v2 at fixed contact #2, diodes 4 to 6 constitute the highest voltage output circuit, but this voltage v2 is 12, and therefore the movable arm A does not move.

The plunger 11 also drives a display mechanism (not shown), and as a result, abnormalities in the part of the vehicle where the sensor 1 is installed are preferentially displayed.

On the other hand, when the sensor 3 first detects an abnormality, the plunger 11 moves the movable arm A to the fixed contact #3 and also drives the display mechanism to perform a predetermined display. When the abnormality is displayed, since v2>v3, the oscillator 9 starts oscillating and connects the movable arm A to the fixed contact #.
Drive up to 2.

Thus, according to the present circuit, only the abnormality detected by the sensor with the highest priority is displayed until the abnormality is removed.

FIGS. 2A-2C are joined together to show the specific example of FIG.

First, referring to Figure 2A, SL is a sensor for detecting engine cooling water temperature, S2 is an engine oil level detection sensor, S3 is a radiator cooling water level detection sensor, S4 is a washer water level detection sensor, and S5 is a brake lamp disconnection detection sensor. , S6 is a brake lining wear detection sensor, S7 is a headlamp disconnection detection sensor, and S8 is a tail lamp disconnection detection sensor.

In addition, B is a battery fluid level detection sensor, Fl is a brake lamp circuit fuse breakage detection sensor, F2 is a tail lamp fuse breakage detection sensor, and CHG
calculates the voltage of the charging lamp that lights up while the ignition key is turned to start the engine during charging, and warns of battery over-discharge.

GND is a ground circuit.

T and T3 are transistors that constitute an amplifier circuit, and have a delay function with capacitors C1 and C3.

To this amplifier circuit is a sensor S1 connected to an AND circuit,
S2 is connected and transistor T3 is configured to turn off when both sensors detect an abnormality.

Note that the reason why the amplifier circuit is provided with a delay function is to prevent the sensor from malfunctioning due to large fluctuations in the level of engine oil or the like when the vehicle passes on a slope.

Further, T4 is a transistor and constitutes an inverter.

This uses a lead electrode to detect the battery fluid level in consideration of corrosion.If the fluid level is normal, the electrode is immersed in the battery fluid and outputs a certain voltage, but when the fluid level is too low, the electrode separates and outputs a certain voltage. Since the voltage is zero, it converts the operating state to be grounded when normal and off when abnormal, just like other sensors.

Also, T5 to T7 and T8 to T1o are transistors,
It constitutes an amplifier circuit, and has capacitors C5 and C8 to which the output voltage is fed back via resistors R□5 and R24, and has a memory function.

T1 is also a transistor and constitutes an inverter.

Next, referring to FIG. 2B and C, the fixed contacts #1 to #4, #6 to
Resistors R36 and R43 connected to #8, R3° and R44
, R38 and R46, R3, and R46, R4o and R47,
R4□ and R48, R4゜ and R49 constitute a voltage dividing circuit,
The priority of each sensor produces a large partial pressure output.

In this example, two changeover switches and two display windows are provided, but each has the same structure.

D4 to D1□ are diodes, which correspond to diodes 4 to 6 in Figure 1.
Configure the maximum output derivation circuit as shown below.

10.1□ is a conductive wire corresponding to 12 in Fig. 1, and these are connected to fixed contacts #0 and #5 via transistors T1□ and T13 that constitute the inverter, and to a differential terminal corresponding to 8 in Fig. 1. One transistor T14, T24 of the transistors T14, T15 and 24, T25 that constitute the amplifier
is connected to the base of the resistor R56 and R74.

Transistors T1□, T19 and Ding.

7, T28 constitutes a multi-by-break, and corresponds to the oscillator 9 in FIG.

The start and stop of oscillation of this multivibrator is controlled by transistors T18 and T29, and when these transistors are on, oscillation is stopped, and when these transistors are off, oscillation is started.

T3□ is a multi-bye break T17, T1 when the power is turned on.
9 and ding.

7. A transistor that controls T28. When the power is turned on, a base current is supplied through the capacitor C14 to turn on the transistor, turning off the transistors T18 and T29 and starting oscillation.

Transistors T19 to T2□ and T23 to T3□ are drive circuits for plungers MP□ and MB2.

Plungers MP1 and MB2 are switch SW1 and S
A changeover switch SW that drives the movable arms A1 and A2 of W2 and is provided on the two display devices DSP1 and DSP2.
The movable arms AI' and A2' of SW1' and SW2' are driven.

Fixed contacts #1' to #4', #6 of these changeover switches
' to #9' are connected to abnormality display lamps L1 to L4 and L6 to L9 of the vehicle portion where the respective sensors are arranged.

Of these lamps, Ll indicates engine oil, F2 indicates radiator, F3 indicates battery, F4 indicates washer, F6 indicates
is for brake lamps, F7 is for lining wear, F8 is for headlamps, and F9 is for tail lamps.

Llo is a master caution lamp that lights up when an abnormality is detected in even one location, notifying the user that an abnormality has occurred.

Since the operation of this circuit is the same as that shown in FIG. 1 described above, it will be briefly explained.Movable arms A1 and A2 normally remain at fixed contacts #0 and #5.

Since the changeover switches SW1 side and SW2 have the same configuration, one of them, SW1 side, will be explained. At this time, transistor T14 is off, T15 is on, T16 and T□8 are on, and oscillation is stopped.

When a certain sensor, for example S3, detects an abnormality, fixed contact #
2, a voltage is generated by dividing the voltage Vcc by resistors R37 and R44, transistor T1° is turned on, and fixed contact #0 is turned on.
Set the voltage to O.

As a result, transistor T14 is turned on, T15 is turned off, transistors T16 and T18 are turned off, and oscillation starts.

This state does not change even if the movable arm A□ moves to the fixed contact #1, and when it moves to the fixed contact #2, the transistors T14, T1 . The voltages applied to the bases of the transistors (Vi, Vd in Fig. 1) become equal, and the voltages applied to the bases of the transistors T15 and T1 become equal.

, T18 is turned on and oscillation is stopped, and the movable arm A1 remains on the fixed contact #2.

At this time, the movable arm A1' on the side of the display device DSP1 also moves to the fixed contact #2' and lights up the lamp L to indicate the radiator abnormality.

In this example, two display devices are provided, so if there is an abnormality, two display devices will be displayed, one for each device with a high priority.

As described in detail above, according to the present invention, only one item with a high priority among a large number of display items is continuously displayed, so that the driver's attention can be strongly aroused.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the basic configuration of a warning display device of the present invention, and FIGS. 2A, B, and C are circuit diagrams showing one embodiment of the present invention. In the drawing, 1 to 3 are sensors, SW is a changeover switch, and #0 to
#3 is its fixed contact, A is its movable arm, 9 to 11 are its drive mechanisms, and 8 is its comparison circuit.

Claims (1)

[Claims] 1 When an abnormality is detected when connected to a plurality of sensors placed in each part of the vehicle and the output of the sensor,
A plurality of voltage divider circuits that generate a voltage with a unique voltage value assigned in advance so that the sensor with a higher priority has a higher voltage as the output of the sensor, and the output of the voltage divider circuit. A highest voltage output circuit using a diode that outputs only the highest voltage, and the voltage divider circuit in which the output of the highest voltage output circuit is inverted using binary logic and the output of the highest voltage output circuit is at zero potential. an inverter that outputs a voltage lower than any of the characteristic voltage values of the inverter, a fixed contact for normal shutdown connected to the output terminal of the inverter, a plurality of fixed contacts connected to each of the voltage dividing circuits, and one end a changeover switch having a movable arm which is connected as a common contact to each fixed contact at the other end, a driving means for the movable arm, and comparing the output voltage of the highest voltage output circuit and the movable arm output voltage; A warning display device for a vehicle, comprising a comparison circuit that operates the driving means while the latter is lower than the former, and the driving means simultaneously drives a display mechanism.