JPS58145540A - Display device of engine temperature for vehicle - Google Patents

Abstract

PURPOSE:To improve visibility of a display for temperature of an engine at its warming operation, by spreading the display of temperature when temperature of the engine is lower than a prescribed value and resetting the display to an ordinary level when the temperature increases higher than the prescribed value. CONSTITUTION:If an ignition switch is closed, a closing signal of a detector 6 is generated to start operation of a microcomputer 8 and apply car speed, rotary speed and residual quantity of fuel respectively to display parts 11a- 11c, then apply display instruction signals from a CRT controller 10. While in a display routine of water temperature by the microcomputer 8, during the time cooling water temperature of an engine is lower than a preset level set by a keyboard 7, a bar graphic display 11d of water temperature is spread, if the water temperature rises higher than the preset level, the bar graphic display 11d of the water temperature is reset to an ordinary level while the present time 11e is displayed in lower position of the display 11d. Accordingly, visibility at warming operation is improved while transfer to a normal operational condition can be surely recognized.

Description

[Detailed description of the invention] This invention relates to an engine temperature display device.

Conventionally, when displaying the engine temperature of a vehicle, for example, the temperature of the engine cooling water, the temperature of the cooling water is detected by a thermistor, etc., and the value corresponding to the resistance value is set as the water temperature by a pointer type or bar graph display. are doing.

However, drivers need to display the water temperature only when they are warmed up or when they are in a heat state.
When the temperature is stable, there is no need to display the water temperature.

The present invention has been developed based on the above-mentioned problem, and is designed to enlarge the engine temperature display when the engine temperature is lower than a predetermined value, and return the engine temperature display to the normal size when the engine temperature becomes higher than the predetermined value. By making
An object of the present invention is to provide a vehicle engine (2) temperature display device that improves the visibility of the engine temperature display during warm-up operation.

The present invention will be described below with reference to embodiments shown in the drawings.

Figure 11 is an overall configuration diagram showing one embodiment of the present invention, where l is a vehicle speed sensor that generates a vehicle speed pulse with a frequency proportional to the running speed of the vehicle, and 2 is a vehicle speed sensor that generates a rotation pulse with a frequency proportional to the engine speed. A rotation sensor, 3 a fuel sensor that generates a fuel signal according to the fuel level in the fuel tank, 4 a water temperature sensor as a temperature detection means that detects the engine cooling water temperature and generates a water temperature signal, 5 a fuel sensor The fuel signal from 3 and the water temperature signal from water temperature sensor 4 are digitalized (5
6 is an ignition key detector that detects the ON state of the ignition switch, 7 is 0
This keyboard is equipped with numeric keys from 9 to 9, a time setting key, and a setting change switch 7a for instructing to change the setting level of water temperature □ expansion. (When changing the settings, first set the values from θ to 10, and then operate the setting change switch 7a.) (3) 8 performs digital calculation processing of the software according to a predetermined control program. A microcomputer is used as an arithmetic means to perform the calculation, and the crystal resonator 9 is connected to the microcomputer.
It is activated by receiving a stabilized voltage of 5V from the battery via the stabilized power supply circuit, executes arithmetic processing to be described later, and generates various display signals.

10 is a CRT controller, and microcomputer 8
In response to display signals from Based on the data, video signals and synchronization signals are generated to display vehicle speed, rotational speed, remaining fuel level, water temperature, clock, etc. on a CRT. Reference numeral 11 denotes a CRT display device installed in the instrument panel inside the vehicle, which displays vehicle speed, rotational speed, remaining fuel level, water temperature, hour hand, etc. as shown in FIG. , 11a, 1
l b, 11 c, 11 d, 11 e
Display (4) This is to be displayed in the section. The CRT controller 10 and CR7 display device 11 constitute display means.

Next, the operation of the above configuration will be explained with reference to the display explanatory diagrams of FIGS. 2 and 3 and the calculation flowcharts shown in FIGS. 4 to 8.

Now, in a vehicle equipped with components 1 to 11 in FIG. Both are activated by receiving a stabilized voltage of 5V via a voltage source (not shown). And this microcomputer 8
When power is first supplied to
Next, set the registers, counters, lunches, etc. in the microcomputer 8 to the initial state necessary for starting the calculation process, and then, while power is being supplied to the microcomputer 8, perform the calculation process shown below at all times. Execute repeatedly. That is, (5) if the ignition switch is not turned on, the calculation process from step 102 to step 106 and returning to step 102 via routine 60() is repeated; if the ignition switch is turned on, the calculation process is repeated from step 102. Step 103, routine 200.300,400,5
The calculation process returns to step 102 through 00.600 and is repeatedly executed.

Now, Igni 7 scene sui, not when driving a vehicle.

If the switch is not turned on, the ignition switch detector 6 does not generate a signal to detect the turning on, so when step 102 in FIG. 4 is reached, the determination is NO, and step 1
Proceed to 06, set the first flag, and complete routine 600.
Proceed to step 1 and execute the clock calculation of the current time (including the calculation of correcting the current time by operating the time setting key on the keyboard 7 when the time is displayed on the CR7 display device 11 in °C), and step Return to 102. From then on,
The above arithmetic processing is repeatedly executed, and only the clock calculation of the current time is performed, and the arithmetic processing for display control (6) is not performed at all.

Then, in order to start driving the vehicle from this state, when the ignition switch is turned on, the CRT display device 1
Each part of the electrical system including 1 is activated by receiving power from the battery via the ignition switch. Also, since the ignition switch detector 6 generates a power-on detection signal, the microcomputer 8 makes a YES determination when it reaches step 102 in FIG. Since the flag is set, the determination is YES, and step 1
Proceed to 05. In step 105, the first enlargement flag and the normal first flag, which will be described later, are set, and a counter for the number of rotational stitches (counts the value of an internal timer with a frequency sufficiently higher than the rotational pulse generated by the rotational sensor 2). , the counters for counting the vehicle speed (counting the vehicle speed pulses from the vehicle speed sensor 1) are reset, and the display portions 11a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 20, 20, 20, 20, 20, 24, 22, 22, 23, 23, 22, 22, 22, 23, 22, 23, 22, 22, 22, 22, 2, 2, 2, 2, 2, and illustrative embodiments 11a, llb, lie are used to display the vehicle speed, rotational speed, and remaining fuel amount (see FIG. 2) ), each display frame in (7) and p>B, numbers 1 to 8,
A display command signal for displaying the fixed display portion of km/h is generated to the CRT controller 10.

After this step 105, and after the next time the determination in step 103 becomes No (because the first flag has been reset in step 104), the performance processing from routines 200 to 600 is executed.

The detailed arithmetic processing of the vehicle speed display routine 200 is shown in FIG. In this routine 200, the determination in step 201 becomes NO and no arithmetic processing for displaying the vehicle speed is executed until the timer that determines the number of vehicle speed needles and time reaches the time limit, but the subtraction processing by the internal timer Steps when the timer reaches a time-up state.

The determination in step 201 becomes YES. And step 20
Proceeding to step 2, the timer is set again, and the process proceeds to step 203, in which the vehicle speed pulse from the vehicle speed sensor l is counted (8) until the timer reaches time-up, and the value of the counter is successively recorded and memorized. Step 2
Go to step 04 to reset that counter and step 20
Step 5 proceeds to create display data for numerically displaying the vehicle speed value using the previously stored Curran 1 value, and proceeds to step 206 to generate the created display data to the CRT controller 10. As a result, the vehicle speed value at that time is numerically displayed on the CRT display device 11.

In addition, in the rotation speed display routine 300, as shown in FIG. 6, the calculation process for displaying the rotation speed is performed until the rotation pulse is generated from the rotation sensor 2, and the determination in step 301 becomes No. does not execute anything, but if a rotation pulse is generated from rotation sensor 2, the judgment is YES.
, the process proceeds to step 302 where it stops counting the value of the internal timer and stores the counted value (
The count value of the internal timer from the time of occurrence of the previous rotation pulse to the time of occurrence of this time is successively stored and stored, and the process proceeds to step 303, where the counter is reset and the counting operation is restarted, step (9) and step 304. Step 305 proceeds to create display data for displaying the number of revolutions in a par graph based on the previously stored count value, and proceeds to step 305 to generate the created display data to the CRT controller 10. As a result, the number of revolutions is displayed as a part graph on the CRT display device 11.

Furthermore, in the fuel remaining amount display routine 400, as shown in FIG. 7 in detail, the calculation process is first determined by an internal timer in step 401, and whether or not one second has elapsed. Proceeding to 402, the A/D value from the fuel sensor 3 via the A/D converter 5 is input and stored;
The number of times I went to step 403 and memorized that input was 25.
It is determined whether the number has reached 6 or not. -Then, when the number of times reaches 256, the determination becomes YES, and the process proceeds to step 404, where the average of the 256 A/D values is taken, and the display level of the remaining fuel amount is selected, and the process proceeds to step 405, where the display level up to that point is displayed. It is determined whether display rewriting is necessary by comparing with the display level. If it is determined that the display needs to be rewritten, the process proceeds to step 406 (10), where display data for displaying the remaining fuel amount as a bar graph is created based on the data of the display level selected earlier, and the process proceeds to step 407. Display the created display data on a CRT
Occurs on controller 0.

As a result, the amount of fuel remaining at that time is displayed on the CRT display.
A bar graph is displayed on l.

Next, detailed calculation processing of the water temperature display routine 500 will be explained according to the calculation flowchart of FIG. First, Sf
, It is determined whether or not the setting change switch 7a on the keyboard 7 has been operated using the tab 501. If the switch 7a is not operated, the process directly proceeds to step 503, but if the switch 7a is not operated to change the setting level, the process proceeds to step 502, where the value being set on the keyboard 7 (the The value is water temperature level 10
(corresponding to one level of the stage) and store it. Then, in step 503, the A/D from the water temperature sensor 4 is
Input the A/D value via the converter 5, and proceed to step 504 to select the display level of the water temperature according to the specific relationship shown in the figure using the input A/D value, and proceed to step 505 to select the display level of the water temperature. It is determined whether the displayed display level is equal to or lower than the set level. At this time, if the engine cooling water temperature has fallen to the extent that warm-up is required and the determination in step 505 becomes YES, the process proceeds to step 506, and since the first enlargement flag has been set by then, the determination becomes YES. , the process proceeds to step 507, where the first enlargement flag is reset, and the process proceeds to step 508, where a display command is issued to the CRT controller 10 to display the outer frame of the water temperature display section lid and Hl-C as shown in FIG. occurs in Then, the process proceeds to step 510 to create display data for displaying the water temperature as a bar graph based on the data of the display level selected earlier, and step 5
Proceeding to step 11, the created display data is generated to the CRT controller 10. As a result, the water temperature at that time is displayed as a bar graph on the CR7 display device 11 as shown in FIG.

Then, when step 506 is reached next time, the determination is N because the first enlargement flag has been reset.
0, the process advances to step 509, where the previous display level data and the current display level data are compared to determine whether display rewriting is necessary. Then, when there is no need to rewrite the display, the determination becomes NO, but when there is a need to rewrite the display, the determination becomes YES, and step 5
100511 is executed and the CR7 display device 11
Change the water temperature bar graph display.

After that, when the engine cooling water temperature rises and the display level obtained in step 504 becomes larger than the set level,
The determination at step 505 becomes No. Then, the process proceeds to step 512, and since the first flag has been normally sent by then, the determination becomes YES, and step 51
Proceed to step 3, reset the normal first flag, and step
The process proceeds to step 514, where a display command is issued to the CRT controller 10 to display the outer frame of the water temperature display portion lid, H)C, and the outer frame of the clock display portion 11e as shown in FIG. 2, and the process proceeds to step 516. Display data for displaying the water temperature as a bar graph (13) is created using the display level data selected previously, and step 517
Then, the created display data is generated to the CRT controller 10. As a result, the water temperature at that time is CR
7. A bar graph is displayed on the display device 11 as shown in FIG.

Then, the process proceeds to step 51B, where the time calculation routine 60
Read the current time data calculated in step 5.
The process proceeds to step 19, where display data for displaying the time is created using the time data, and the process proceeds to step 520, where the created display data is generated to the CRT controller 10. As a result, the current time is displayed on the CR7 display device 11 as shown in FIG.

Then, when step 512 is reached next time, normally 1
The judgment is No because the second flag has been reset.
Then, the process proceeds to step 515, where the previous display level data and the current display level data are compared to determine whether or not display rewriting is necessary. Then, when there is no need to rewrite the display, the determination becomes NO, and the arithmetic processing for displaying the timetable (14) after step 51B is executed;
When the l- is turned off, the determination becomes YES, and the process proceeds to step 516.
．． After passing through step 517, the processing proceeds to step 518 and subsequent steps, so that the pergraph display of the water temperature on the CRT display device is changed.

That is, in this water temperature display routine 500, when the engine cooling water temperature is below a set level (which can be changed by operating the keyboard 7), the water temperature per graph display is enlarged as shown in FIG. When the water temperature becomes higher than the set level, as shown in FIG. 2, the water temperature pergraph display is set to the normal size and the current time is displayed below it.

In the above embodiment, the A/D value input from the water temperature sensor 4 via the Al1) converter 5 is selected as one of the 10 display levels, and when the selected display level is below the set level, I showed something that enlarges the water temperature display,
The A/D value before selecting the display level may be used to determine that the engine coolant temperature is below a predetermined level, and the water temperature display may be enlarged based on this determination.Alternatively, the water temperature display may be a part graph display. However, the present invention is not limited to this, and may be a pointer display or a digital numeric display. Furthermore, the water temperature display does not have to be displayed together with the vehicle speed (revolutions) and the remaining fuel amount, but may be displayed as a single independent display.Furthermore, although the micro combiator 8 is shown as a calculation means, a hard logic based on an electronic circuit is used. It may also be composed of:
Although a CRT is shown as the display means, other image display devices using liquid crystals or the like may be used.

As described above, in the present invention, since the engine temperature display is enlarged when the engine temperature is lower than a predetermined value, the visibility of the engine temperature display during warm-up operation can be improved, and during normal operation, the engine temperature display can be improved. Since the engine temperature display is restored to its normal size, the change in display area has the excellent effect of making it possible for the driver to reliably recognize and recognize the transition from warm-up to normal operation. .

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG.
Figure 3 is an explanatory diagram of the display of a CRT display device, Figures 4 to 8
The figure is a calculation flowchart for explaining the calculation processing of the micro combinator. 4...Water temperature sensor as temperature detection means, 8...Micro combinator as calculation stage, 10.11...
- A CRT controller and a CRT display device that constitute display means. Representative Patent Attorney Takashi Okabe (17) @1 Figure 112 Figure wA3 Figure 4

Claims (1)

[Scope of Claims] A vehicle engine comprising a temperature detection means for detecting the engine temperature of the vehicle, and visually displaying the engine temperature at a position in front of the driver's seat in the vehicle interior based on an electric signal from the temperature detection means. In the temperature display device, it is determined whether or not the engine temperature is lower than a predetermined value based on the electrical signal from the temperature detection means, and when this determination is affirmative, a first pattern predetermined in relation to the electrical signal is displayed. calculation means for generating a first display signal, and generating a second display signal of a predetermined second pattern in relation to the electric signal when the determination is negative; Upon receiving the display signal, the engine temperature at that time is displayed in the first state with a large display area, and upon receiving the second display signal, the engine temperature at that time is displayed in the second state.
A vehicle engine temperature display device comprising: 1) display means for displaying in a second state with a display area smaller than the display area of the state;