JPS58148915A - Monitor device for operation state of engine - Google Patents

Abstract

PURPOSE:To read the rotational frequency and load condition of an engine on one display by displaying the relation between detected values of the engine speed and load condition of the engine on the display on orthogonal coordinate basis. CONSTITUTION:The detected values of an engine speed sensor 9 and a boost pressure sensor 10 are converted by converters 11 and 12 into digital values, which are inputted to an arithmetic device 13 to calculate X and Y coordinate of a display point from said data, thereby storing pieces of still picture information on various operation curves, operation areas, etc., in a picture memory 14. Those pieces of picture information are read by the arithmetic device 13 and the still picture of the display point is sent out by being replaced by picture information on the display point read out of another memory to display the relation between the engine speed and engine boost pressure on a cathode-ray tube 19 on X and Y coordinate basis through an interface control circuit 16, brightness modulating circuit 17, and X and Y polarizing circuit 18, thus reading both values at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle-mounted engine operating state monitoring device.

As a conventional engine operating state monitoring device, for example, there is one shown in FIG. 1.2 (published by Ninosan, Service Circulation No. 322, July 1978). In FIG. 1, 1 is a vehicle speed meter, 2 is an engine revolution meter, and 6a and 6b are left and right turn indicators.

Further, in FIG. 2, 4 is a remaining fuel gauge, 5 is a cooling water temperature gauge, and 6 is a boost gauge (intake negative pressure needle).

Although not shown, an engine oil pressure gauge, a voltmeter, an ammeter, and an oil temperature gauge are also used to monitor the engine operating state of the vehicle. Conventionally, in order to drive a vehicle economically, it has been necessary to use the engine tachometer 2 and boost meter 6 as a guide to avoid increasing the engine speed more than necessary or pressing the accelerator pedal too much. It was said that it was a good idea to drive carefully to avoid falling. However, it is not easy, especially for beginners, to drive while looking at the engine tachometer and boost gauge at the same time.

In Figure 2, the boost gauge 6 is color-coded into green zone 7 and yellow zone 8, and fuel efficiency is improved by driving in green zone 7, but the boost pressure generated by the engine depends on the throttle opening. Even under a constant condition, it changes depending on the engine speed (see Figure 6), so the economical operating range and output range of the engine will differ depending on the combination of engine speed and boost pressure, so a single meter cannot accurately determine the economical operating range. There was a problem that it was difficult to display.

In view of the above points, the present invention provides an in-vehicle engine operating status monitoring device that can read engine speed and engine load status simultaneously on a single display, and facilitates economical operation of the vehicle. It's about doing.

In order to achieve the above object, the present invention detects the engine rotation speed and the engine load state, and displays either of these detected values on the screen of a display device such as a cathode ray tube.
It is displayed as a point, with the detected value being the axis coordinate and the other detected value being the X-axis coordinate. The engine load condition can be displayed by boost pressure or engine shaft torque. The display screen also shows the boost pressure curve (or shaft torque curve) when driving at a constant speed on a flat road, the boost pressure curve (or shaft torque curve) when the throttle is fully open for a non-supercharged engine, and the boost pressure when the engine is supercharged. curve (or shaft torque curve), normal operating range during idling, abnormal operating range during idling, economical vehicle operating range, acceleration, uphill range, deceleration, downhill range,
The X-axis scale shows engine supercharging range, engine operation limit range, etc.
It can be displayed together with the Y-axis scale, thereby further enhancing the effects of the present invention. As the display device, a cathode ray tube method, a light emitting diode method, a liquid crystal display method, or a combination thereof can be used.

Below, embodiments of the present invention will be described with reference to the drawings.

FIG. 4 shows a 7" stem configuration when a cathode ray tube is used as a display. The detected values of engine rotation speed and engine boost pressure are digitalized by converters 11 and 12, respectively, by an engine rotation sensor 9 and a boost pressure sensor 10. The data is converted into a value and input to the arithmetic unit (microconbeater) 13, and from these data the X-axis coordinate and the X-axis coordinate of the display point are calculated by the arithmetic unit 13.X-axis scale, Y-axis scale,
Still image information such as various driving curves and driving ranges is stored in image memory 1.
4 and sequentially read out to the arithmetic unit 16. When the read still image information reaches a position corresponding to a display point, the arithmetic unit 13 replaces the still image information at that point with image information about the display point read from another memory (not shown). send out.

Reference numeral 15 denotes a data input device for performing other image processing such as zooming, which will be described later. The interface control device 16 converts the image information sent from the arithmetic device 16 into a video signal, operates the brightness modulation circuit 17, the X, Y deflection circuit 18, etc., and displays the image on the cathode ray tube 19, which is a display device. As is clear from the above description, the display image of the cathode ray tube 19 is an image (video) of a display point where the detected value of either the 1727 rotational speed or the boost pressure is set as the X-axis coordinate, and the detected value of the other is set as the X-axis coordinate. The resulting image is a composite of the image and the still image that serves as the background. The image synthesis technology described above is an application of existing technology called image overlaying or embedding.

In FIG. 5, an electromagnetic pickup 21 is used as an engine rotation sensor 9 by rotating a toothed rotary plate 20 on the crankshaft.
The pulse signal generated in the F-V converter 22 converts the pulse signal into a DC voltage
. Although an example in which the engine ignition signal is converted into a voltage is shown, the engine ignition signal may be converted into a voltage and used.

FIG. 6 shows an example of the configuration of the boost pressure sensor 10 for detecting engine boost pressure, which includes a case 23 into which boost pressure is introduced, a diaphragm 24, a sensing beam 25. It consists of a strainer, a filter 26, and filters 27 and 28. This boost pressure sensor has been used conventionally, and detailed description thereof will be omitted.

FIG. 7 shows an example of a circuit for processing the output signal of the boost pressure sensor 10, in which the input voltage from the PCL converter 29 to which the strain gauge 26 is connected in a bridge configuration is applied to the amplifier 60 and the resistors R1 to R9. ■The output voltage is processed by the output circuit that includes. This is a known circuit that obtains the following.

FIG. 8 shows an example of a background image displayed on a cathode ray tube.

61 is the Y-axis (lateral leakage)), 62 is the Y-axis (vertical axis), 31a is the X-axis scale, and 32a is the Y-axis scale. In this example, the Y-axis shows the engine rotation speed (rpm), and the Y-axis shows the engine speed. Boost pressure (m
The scale is mI (g).

63 is the boost pressure curve when the vehicle runs at a constant speed on a flat road, 64 is the boost pressure curve when the throttle is fully opened for a non-supercharged engine, and 35 is the boost pressure curve when the engine with a supercharger is fully charged. It is a curve.

Therefore, in general, the operating range is the 0 part is the acceleration and climbing range, the 0 part is the supercharging range that generates high torque and high output, the 0 part is the deceleration and descending range, and the 0 part is adjacent to the 0 part. This is the constant speed driving range, of which the ■ and 0 parts are the economical driving range. The 0 part is the normal operating range during idling, and the part (■) is the abnormal operating range indicating insufficient suction negative pressure during idling.

If a color cathode ray tube is used for the display, for example, ■, ■, 0 parts are dark green, [stock] part is light green, ■, 0 parts.
The part is displayed in pale yellow or pale orange, and the 0 part is displayed in dark yellow. @ indicates a red zone limited by the engine speed, and [Yes] indicates a red zone as a countermeasure against engine failure due to overboost pressure.

It's a moat, as shown in the figure, there is a power meter 45 on the cathode ray tube.
It is also possible to display '' at the same time, and the engine output calculated by the calculation device 13 from the engine rotation speed and boost pressure is digitally displayed here.

FIG. 9 shows an example of a display image during engine/engine operation. 8th
The diagonal lines representing the colored display of the areas ■, ■, ■, ■, ■ in the figure are easy to see, so they are omitted from this figure onwards. In this figure, the engine rotation speed is plotted on the Y-axis (horizontal axis) 61, and the Y-axis (vertical axis) 3
Since the engine boost pressure is taken as 2, the detected values of engine speed and boost pressure are determined at a point (hereinafter referred to as display point) 46 on the screen where the former is the X-axis coordinate and the latter is the Y-axis coordinate.
It should be displayed. This display point 46 is displayed as a dot image having a certain size, as shown in black in the figure. Therefore, when the display point 46 is at the position shown in the figure, the engine speed is 600 rpm and the boost pressure is -20
0mm11g-c You can see at a glance that it is being operated. Furthermore, since the display point 46 is located on the higher load side than the flat road constant speed running curve 66, it can be seen that the vehicle is in a somewhat uphill or accelerated driving state. At the same time, the edge/output calculated from the detected values of engine speed and boost pressure is displayed on the power meter 4.
5.

In order to drive economically on general roads, it is best to drive in such a way that the display point 46 does not protrude too far from the areas ■ and ■ (green zones) in the figure.

Since the display point 46 tends to move like the screen when driving vigorously, the brightness and chromaticity are selected to the extent that the driver does not get tired.

If the image of the display point 46 is periodically displayed blinking by a timer, it will be easier for the driver to see than if it is displayed continuously 7-). In addition, when the vehicle suddenly accelerates or decelerates, the engine speed, boost pressure, shaft torque, etc. change drastically, so in order to avoid the display point 46 from moving violently due to this, the sensor unit or signal processing circuit It is also necessary to adjust the sensitivity appropriately by installing a Danopa on the It is a diagram of another embodiment of the display.

FIG. 11 is another example diagram in which the enon load state is expressed in terms of shaft torque, where the X-axis 61 represents the engine rotation speed (rpm), and Y@32 represents the enon/shaft torque (kg-m). Display points 46 display detected values of engine rotational speed and engine shaft torque. In the figure, 47 is the shaft torque curve i when driving at a constant speed on a flat road, 48 C is the shaft torque curve when the throttle of a supercharged engine is fully open, and 49 is the shaft torque curve when driving at a constant speed on a flat road.
/ Shaft torque curve during supercharging, displayed on the CRT screen along with display point 46. This display screen should be able to display the green zone, yellow sheets, and let zone as well as in Figure 8. It's okay, the power meter 45 is the same picture m1 (
/ You should also display this.

FIG. 12 is a diagram of another embodiment in which the display of the X-axis and Y-axis is exchanged, and the X-axis 31 shows the enon/shaft torque, and the Y@62 shows the 1777 rotation speed.

There is a correlation between shaft torque and boost pressure if the engine speed is the same, so use the arithmetic unit 13 in Figure 4 to convert the detected value of the boost pressure sensor 10 into shaft torque and display it. Alternatively, as shown in FIG. 15, a torque meter 51 may be attached to the vehicle drive shaft 50 to detect torque, and the detected value may be displayed.

Fig. 14 is a configuration diagram of a commonly used magnetostrictive torque meter, in which 52 is a casing, 53 is a rotating shaft, 54 is a bearing, 55 is a torque tube, 56 is a magnetostrictive tube (sensing section), and 57 is an excitation tube. 58 is a magnetostrictive output coil, 59.60 is an electromagnetic coupling, and 61.62 is an input side and output side connector.

Figure 15 shows the signal processing circuit of a magnetostrictive torque meter.
The detection signal of the magnetostrictive output coil 58 is processed by a preamplifier circuit 63, a phase discrimination detection circuit 64, and an output amplification circuit 65, and outputted as a torque instruction signal. In addition to this figure, a rotary motion 66 for indicating the number of revolutions, a shaft rotation number measuring circuit 67, and a horsepower calculation circuit 68 for indicating the horsepower are added. In addition, since the drive shaft rotational speed is increased or decreased by the transmission than the engine rotational speed, the transmission gear position detector 6
The output amplification circuit 65 corrects the torque instruction signal based on the signal from 9.

Figure 16 is a partially enlarged view of the image, since the operating range is small and hard to see when displayed at full scale (6000 rpm, +400 mmHg) as shown in Figure 9 during economical driving. Both the Y-axis 32 are scaled more finely, and the flat road constant speed traveling curve 66 is also displayed thicker and easier to see. If image processing is performed using a cathode ray tube and a microconbeater, it is possible to enlarge (zoom) the displayed image by pressing a button.

FIG. 17 shows another embodiment in which a vehicle speed meter 70 and a distance meter 71 are incorporated into the display screen of this device. Although not shown in the figure, if a water temperature gauge, fuel gauge, etc. are incorporated into the other blank areas of the display screen and displayed digitally, the entire monitor device can be made compact in the same way as conventional monitor devices.

18 to 21 show other embodiments in which the display device is constructed using light emitting diodes. Fig. 18 is a single view of a round-head light emitting diode, Fig. 19 is a side view of a display device using a round-head light emitting diode, Fig. 20 is a plan view thereof, and Fig. 21 is a display device using a square-head light emitting diode. FIG. 72 is a round head light emitting diode, 76 is a square head light emitting diode, 74
75 is a transparent or semi-transparent plate made of glass, acrylic plate, etc. 76 is a translucent film that is used by pasting it on a transparent plate when used. On the substrate 74, light emitting diodes of various colors such as green, yellow, and red are arranged in a matrix, and the X and Y axes 31.3
2. The scales 31a, 323, etc. are the translucent film 7 on the front.
6 (or semi-transparent plate 75) to constitute a light emitting diode display 77.

FIG. 22 shows an example of a drive circuit for operating the light emitting diode type display shown in FIGS. 19-21.

In this example, comparators 78, 79, and gates 80
．． 81, voltage dividing resistors 82 and 86 constitute an X-axis decoder and a Y-axis decoder, and a reference voltage Vref and an X-axis input 84,
The Y-axis input 85 operates the X and Y decoders to selectively drive the light emitting diodes 72 (73) connected between the drive lines 86 and 87.

As a result, the display points 46 in FIGS. 20 and 21 are displayed as dots, and it is possible to know which operating range the vehicle is in based on the emitted light color such as green, yellow, or red.

FIG. 26 shows another embodiment using a liquid crystal display. 88
is a front glass substrate, 89 is a back glass substrate, 90 is a horizontal electrode, 91 is a vertical electrode, X and Y axes 61.62,
The scales 31a, 32a, etc. are written on a glass substrate 88 on the front surface to constitute a liquid crystal display 92.

FIG. 24 is a diagram showing the principle of matrix drive of a liquid crystal display, in which a selection point (
A voltage is applied so that the display point 46 is in reverse phase and the non-selected point is in the same phase, and the display point 46 is displayed as a dot by utilizing changes in the reflectance or transparency of the liquid crystal caused by the voltage application. The drive method is the generally known 1/2 bias method,
By 1/3 bias method etc. Furthermore, if a liquid crystal display that develops color upon application of voltage is used, it is possible to display the colors of the operating region.

As explained above, according to the present invention, the engine rotation speed and the engine load condition are displayed on the same screen in that the detected value of one is set as the X-axis coordinate, and the detected value of the other is set as the Y-axis coordinate. Therefore, if you drive while watching this, you can easily drive the vehicle economically.

Furthermore, the boost pressure curve (or shaft torque curve) when driving at a constant speed on a flat road, when the throttle is fully open, and during engine supercharging,
By displaying the economical operating range, acceleration, uphill range, deceleration, downhill range, engine supercharging range, etc. on the same screen, you can not only see the engine operating status at a glance, but also check the economical operating range (green zone) on the screen. Even beginners can easily drive economically if they try to drive so that the display points do not protrude too much. If you can display the normal operating range and abnormal operating range during idling on the same screen, you will be able to see at a glance if the engine is malfunctioning during idling.

[Brief explanation of drawings]

Figures 1 and 2 are front views showing conventional engine operating condition monitoring devices, Figure 3 is a curve diagram showing the relationship between engine speed and shaft torque using engine boost pressure as a parameter, and Figure 4 is a display device. A system configuration diagram of an embodiment of the present invention using a cathode ray tube, FIG. 5 is a schematic diagram of an engine rotation sensor, FIG. 6 is a sectional view showing an example of the configuration of a boost pressure sensor, and FIG. 7 is a signal of the boost pressure sensor. processing circuit diagram,
Fig. 8 shows an example of the cathode ray tube display image when the engine is stopped, Fig. 9 shows an example of the cathode ray tube display image when the engine is running, and Figs. 10, 11, and 12 show the cathode ray tube display image. Figures showing other examples, Figure 13 is a diagram showing how the torque meter is used, Figure 14 is a sectional view showing a configuration example of the torque meter, Figure 15 is a signal processing circuit diagram of the torque meter, Figure 16, FIG. 17 is a diagram showing still another example of a cathode ray tube display image, FIG. 18 is a perspective view of a round-headed light emitting diode, and FIG. 19 is another embodiment of the present invention in which a display is configured using round-headed light emitting diodes. 20 is a plan view thereof, FIG. 21 is a plan view of another embodiment of the present invention in which a display device is constructed using square-headed light emitting diodes, and FIG. 22 is a plan view of a light emitting diode drive circuit. An example diagram, FIG. 23 is a plan view of another embodiment of the present invention using a liquid crystal display, and FIG. 24 is an explanatory diagram of matrix driving of the liquid crystal display. 9... Engine rotation sensor 10... Boost pressure sensor 16... Image display arithmetic unit 14... Image memory 19 storing still image information...
Display device (cathode ray tube) 31...X @ 32...Y axis 31a...
X-axis scale 32a...Y-axis scale 66...Boost pressure curve when driving at constant speed on a flat road 34...Boost pressure curve when the throttle is fully open for a non-supercharged engine 35...Boost when the engine is supercharged Pressure curve ■...Acceleration, climbing area ■...Engine supercharging area ■...Deceleration, dropping area ■, [Phase]...Vehicle economical driving area @...Normal operating area when using eyelid knob■...Idle link Abnormal operation area ■, @...Engine operation limit area■...Display point■...Shaft torque curve when driving at constant speed on a flat road■...Shaft torque curve when the throttle of a heavily supercharged engine is fully open ■...Shaft torque curve during engine supercharging 51...Torque meter 77...Light emitting diode display 92/LCD display Attorney Junnosuke Nakamura Figure 4 IF Figure 5 Off Figure 18 Figure Said Figure 11 ? 13 Fla 1-14 rs age 1
5 Figures 4 and 16

Claims (1)

[Scope of Claims] (1) Means for detecting engine speed, means for detecting engine load condition, on-vehicle display for displaying detected values of engine speed and engine load condition, and respective detected values. It is equipped with a signal processing means for displaying each detected value on a display, and one of the detected values is
An engine operating state monitoring device characterized in that a point is displayed on a display screen with one axis coordinate and the other value as an X-axis coordinate. (2) The display device displays a scale of engine speed on one of the Y-axis and a scale of engine boost pressure on the other, and also displays a boost pressure curve when driving at a constant speed on a flat road, The engine operating state according to claim (1), characterized in that at least one of a boost pressure curve when the throttle is fully opened for an engine without refueling and a boost pressure curve when the engine is supercharged is displayed on the screen. Monitor device. (b) The display device displays a scale of engine rotation speed on one of the Y-axis and a scale of engine shaft torque on the other, and displays a shaft torque curve when traveling at a constant speed on a flat road. Claim (1) characterized in that at least one of the shaft torque curve when the throttle is fully opened for the engine without refueling, and the shaft torque curve when the engine is supercharged is displayed on the screen.
The engine operating condition monitoring device described in . (4) The display is in the normal operating range during idling;
Abnormal driving range, vehicle economical driving range, acceleration, pitching range, deceleration,
Claims (1), (2), and (3) are characterized in that at least one of a drop-off area, an engine supercharging area, and an engine operation restriction area is displayed on the screen. Engine operating condition monitoring device.