JPS6294441A - Indicating device of self-diagnosed result for electronic car control device - Google Patents

Abstract

PURPOSE:To simplify an indicating device by making an engine tachometer on a dashboard at a driver's seat common to an abnormality indicator as well, and enabling changeover between engine speed and self-diagnosis on the same indicating means (such as a pointer) as the engine tachometer. CONSTITUTION:A main operation means 11 is inputted with each type of sensor output signals S11-S1n for detecting each type of operation variables such as engine speed and air intake, and required operations are carried out thereby for outputting each type of control signals S21-S2n. Also, said output signals S11-S1n and the operation contents of the main operation means 11 are diagnosed by a self-diagnosis means 14 and in the occurrence of abnormalities, an abnormality correction signal S20 is outputted from an abnormality correction operation means 15 and an abnormality indication lamp lighting signal S6 is outputted from an abnormality indication operation means 16, together with an abnormality detail indication signal S5. And an abnormality indication lamp 18 in an abnormality indicator 17 common to a tachometer is thereby lit for indicating the occurrence of abnormalities and the pointer 19 of the indicator 17 is swung to a position corresponding thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for displaying self-diagnosis results of an electronic control device that controls various devices mounted on a vehicle, such as an engine and a transmission.

[Prior art]

2. Description of the Related Art Recently, devices have been developed that control various on-vehicle devices, such as a vehicle drive engine, transmission, etc., using an electronic control device using an electronic circuit.

The above device electrically detects various operating variables of the engine and vehicle, performs predetermined calculations using a calculation device using a microcomputer, etc., and controls the engine and various in-vehicle devices according to the results. It is composed of

In the above-mentioned devices, if an abnormality occurs in the various sensors or calculation devices that detect driving variables, it may hinder the operation of the vehicle, and even if the abnormality is not noticed by the driver. If the vehicle is continued to be driven for a long period of time, it may cause damage to various parts of the vehicle.

Therefore, some of the above devices are equipped with a function to self-diagnose the calculation contents of the arithmetic unit and abnormalities of various sensors, and are equipped with a device that displays the self-diagnosis contents when an abnormality occurs or as necessary. be.

However, the space inside the car is limited, and the area near the dash board, which is easy for the driver to see, is occupied by various instruments such as the vehicle speedometer, so it is quite difficult to separately install a device that displays the above self-diagnosis information. Met.

Therefore, it is conceivable to make the instruments conventionally installed on the dash board also serve as a device for displaying the self-diagnosis contents.

As a conventional technique for displaying two different types of contents using one meter, for example, the published patent publication 1983, 30
There is one described in No. 695.

The device described in the above-mentioned document is designed to display both an alarm signal and a clock when an abnormality occurs in a vehicle.

[Problem that the invention seeks to solve]

However, in the above device, since an alarm device is attached to the clock, it is necessary to make major modifications to the extremely streamlined and inexpensively made clock, which is both cost- and technical-related. will also be very disadvantageous.

Furthermore, although current digital clocks are extremely reliable and can be obtained at extremely low prices, they are also prone to malfunctions due to the fact that they are equipped with alarm display devices, and electronic control parts that need to be replaced. There are problems such as there is little advantage in terms of maintenance costs because it is added to some parts.

The present invention aims to solve the problems of the prior art as described above, and has the purpose of combining the display device conventionally provided on the dash board with the function of displaying the self-diagnosis results of the electronic control unit for automobiles. The purpose of this invention is to provide an inexpensive and easy-to-read display device.

Means for Solving Problem c] In order to achieve the above object, in the present invention, -3= In addition to the normal rotation speed scale, abnormalities displayed in areas divided by a predetermined number of rotation speed scales are used. A tachometer-cum-failure indicator has a content display and an anomaly indicator lamp to indicate that an abnormality is being displayed. Under normal conditions, a display signal corresponding to the engine rotation speed is sent to the tachometer-cum-fault indicator, and when an abnormality is displayed, By providing a control means for sending a display signal of a value corresponding to the content of the abnormality and an abnormality display lamp lighting signal, the same display means (for example, a tachometer pointer) of the engine tachometer can be used.
The rotation speed and self-diagnosis results are switched and displayed using the .

[Embodiments of the invention]

FIG. 1 is a diagram showing an embodiment of the present invention.

In FIG. 1, 811 to S1n are sensor signals for detecting various operating variables of the engine and the vehicle, such as an engine rotation signal, an intake air amount signal, a cooling water temperature signal, or a vehicle speed signal.

The main calculation means 11 inputs the above-mentioned various signals 811 to Sin, performs predetermined calculations, and generates various control signals 82□ to S.
2 Output n.

This control signal includes, for example, a fuel injection signal, an ignition timing signal, etc., and also includes a rotation speed display signal 82m corresponding to the engine rotation speed.

The above various control signals are outputted via the output means 12 and given to various non-control devices 13 to control them.

On the other hand, the self-diagnosis means 14 receives the various input signals 81□
~Si. and diagnose the calculation contents in the main calculation means 11,
When an abnormality occurs, an abnormality signal S4 corresponding to the content of the abnormality is output.

The abnormality correction calculation means 15 performs a correction calculation corresponding to the content of the abnormality and outputs an abnormality correction signal S2o.

For example, if the signal from the intake air amount sensor becomes abnormal, the intake air amount is estimated from other input signals, such as a signal corresponding to the throttle valve opening, and the fuel injection position is calculated accordingly. Output.

When an abnormality occurs, the output means 12 switches and outputs the fuel injection amount signal calculated at the time of the abnormality described in - instead of the normal fuel injection amount signal, and controls the fuel injection valve accordingly.

Moreover, when the abnormality display value calculation means 16 is given the abnormality signal S4, it outputs an abnormality content display signal S5 and an abnormality display lamp lighting signal S6 having values corresponding to the content of the abnormality.

The tachometer/abnormality indicator 17 basically has the same structure as a normal tachometer (so-called tachometer).
In addition to the rotational speed scale of the tachometer, the area of the rotational speed scale divided into a predetermined number is provided with an abnormality content display, for example, as shown in the figure, a point displaying a rotational signal abnormality, an injection signal abnormality, etc., and an abnormality display lamp 18. The difference is that

Since the output means I2 normally sends the rotational speed display signal S21 to the tachometer abnormality indicator 17, the pointer 19 of the rotational side abnormality indicator 17 displays the position corresponding to the rotational speed, and normally It operates as an engine tachometer.

When an abnormality occurs (or when instructed by a switch not shown), the output means 12 sends out an abnormality content display signal S5 and an abnormality display lamp lighting signal S6 instead of the rotational speed display signal S2□.

Therefore, the pointer 19 swings to a position corresponding to the content of the abnormality, and the abnormality display lamp 18 lights up to indicate that the abnormality is being displayed.

For example, FIG. 1 shows a case where the injection signal is abnormal.

In addition, in the tachometer-cum-failure indicator shown in Fig. 1, a tachometer with a rotation speed display of 600 rpm is used.
This example shows a case where it is possible to display a total of 7 abnormalities (one item indicates no abnormality), one for every 000 pp, but for example, using a tachometer up to 8000 rpm, one for every 500 rpm. If configured to display abnormal contents, 177 items of abnormal contents can be displayed.

Further, since the abnormality display lamp 18 is lit when the abnormality details are displayed, there is no possibility that the driver will misunderstand that the tachometer is malfunctioning.

Further, in the embodiment shown in FIG. 1, an example is shown in which an analog type tachometer is used, but the present invention can also be applied to a digital type tachometer.

In addition, in FIG. 1, the main calculation means 11, the output means 12
, the self-diagnosis means 14, the abnormality correction calculation means 15, the abnormality display value calculation means 16, etc., include the CPU, RAM, ROM, T/
It can be configured with a microcomputer consisting of ○, etc.

Further, although the output means 12 is shown as hardware, in reality, the switching operation can be performed by a microcomputer program.

Hereinafter, the contents of calculations in the case where the control means of the present invention is constructed using a microcomputer will be explained.

FIG. 2 is an embodiment of a flowchart showing the contents of calculations, and shows only the parts directly related to the present invention.

First, at Pl, a rotation signal given from a crank angle sensor or the like is read.

Next, in P2, the engine rotation speed is calculated from the above rotation signal.

Next, in P3, a self-diagnosis of various sensor signals and calculation contents is performed.

The contents of this self-diagnosis are the same as those conventionally performed.

If it is diagnosed as normal at P3, the process goes to P4 and outputs a rotation speed display signal corresponding to the value calculated at P2.

On the other hand, if an abnormality is diagnosed in P3, the content of the abnormality is determined in P5, and a display value corresponding to the content of the abnormality is calculated in P6.

Next, an abnormality content display signal S5 corresponding to the above display value is outputted at Pl.

Next, in P8, an abnormality indicator lamp lighting signal is output.

As mentioned above, in the flowchart of FIG. 2, the rotation speed is displayed during normal times, and when an abnormality occurs, the details of the abnormality are displayed and an abnormality display lamp is turned on.

Next, FIG. 3 is another embodiment of a flowchart showing the calculation of the present invention.

In FIG. 3, first, the rotation signal is read at Pl, and then the diagnostic command signal is read at P9.

This diagnostic command signal is input by a driver, an inspector, or the like by operating a switch (not shown).

Next, the rotation speed is calculated at P2.

Next, in P3, a self-diagnosis is performed in the same manner as described above, and if normal, the process goes to P4 and a rotation speed display signal is output.

On the other hand, if there is an abnormality in P3, the process goes to PIO, determines and stores the details of the abnormality, and then goes to pH to determine whether or not a diagnostic command signal has been given.

If the pH is O17F, that is, if no diagnosis command signal is given, the process goes to PI3, and it is determined whether the abnormality is a serious abnormality or not.

If I)+2 is No, that is, if there is no serious abnormality, the process goes to P4 and outputs a rotational speed display signal as in normal times.

On the other hand, if P]I is 0N (7) and P]2 is YES (7
), that is, when a diagnostic command signal is given, or even when a diagnostic command signal is not given, if a serious abnormality occurs, go to P6 and take action to deal with the content of the abnormality. Calculate the displayed value.

Hereinafter, P7 and P8 are the same as in FIG. 2 above.

As mentioned above, in the flowchart shown in Figure 3, serious abnormalities are displayed immediately when they occur, but minor abnormalities are simply determined and memorized, but are not displayed immediately, and the diagnostic command signal is displayed. ) is configured so that it is displayed only when given.

The reason for this configuration is as follows.

In other words, if there is an abnormality in the main parts such as the crank angle sensor, there is a possibility that it will collapse and cause problems with operation.
It is necessary to display the details of the abnormality immediately, but in the case of a minor abnormality, such as an abnormality in the atmospheric pressure sensor for altitude correction, if a correction calculation is performed with the atmospheric pressure value set to 760 mmT1g, it is possible to proceed with the operation. - There is almost no possibility of causing a dangerous situation.

However, if such a minor abnormality is displayed while driving, it will call for extra caution from the driver and may even mislead the driver's judgment. It is preferable that the contents are determined and stored and not displayed, and that the display is performed only when an inspector or the like operates a switch to give a diagnostic command signal during periodic inspections.

The switch that provides the diagnostic command signal described above may be provided near the driver's seat, but in view of the usage described above, it may also be provided on the main body of the electronic control device.

〔Effect of the invention〕

As explained above, in the present invention, the tachometer installed on the dash board in the driver's seat also serves as an abnormality indicator, and the engine tachometer and the same display means (for example, a pointer) are used to indicate the rotational speed and the engine speed. Since it is configured to display the diagnostic results by switching between them, there is no need to provide a new instrument for displaying the self-diagnostic results, and the display area on the dash board does not increase, and the display is easy to read. Since the abnormality display lamp is turned on when an abnormality is displayed, there is no possibility of confusing the normal rotational speed display with the abnormality display.

Furthermore, the tachometer/abnormality indicator of the present invention has exactly the same structure as a normal engine tachometer, and drives display means such as a pointer by an abnormality display signal from an electronic control device that outputs a normal rotational speed display signal. Therefore, the only additional parts are installing an abnormality content display around the rotation speed scale, installing an abnormality indicator lamp, and changing the software program in the electronic control unit, making it extremely low cost. It can be realized.

In addition, there is no need to change the pointer drive structure of the tachometer at all, and functions can be expanded only by changing the software program, so there is no effect on failures or reductions in reliability, and maintenance costs can be reduced. You can get excellent results.

In addition, in a device configured to display anything other than serious abnormalities only when a diagnostic command signal is given, minor abnormalities that do not pose a problem for normal operation should be displayed during periodic inspections or daily start-up inspections. Since the display can be displayed only when the vehicle is running, etc., there is no need to display an unnecessary abnormality display during driving, which eliminates the risk of confusing the driver.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are flowchart diagrams each showing an embodiment of the calculation contents of the present invention. <Explanation of symbols> 11. Main calculation means 12. Output means 13.
...Non-controlled equipment 14...Self-diagnosis means 15.
... Abnormality correction calculation means 16 ... Abnormality indicator calculation means

Claims (1)

[Claims] Inputs signals from various sensors that detect various operating variables of the engine and vehicle, performs predetermined calculations, controls various devices of the engine and vehicle according to the results, and automatically detects abnormalities in the above calculations and various sensors. In an automobile electronic control unit equipped with a diagnosis function, in addition to the normal rotation speed scale, an abnormality content display and an abnormality indicating that an abnormality is being displayed are displayed in areas divided by a predetermined number of rotation speed scales. A tachometer-cum-fault indicator having an indicator lamp, and a display signal corresponding to the engine rotation speed is sent to the tachometer-cum-fault indicator during normal times, and when an abnormality is displayed, a display signal of a value corresponding to the content of the abnormality and an abnormality display are provided. A self-diagnosis result display for an electronic control device for an automobile, comprising a control means for sending a lamp lighting signal and a control means for sending a lamp lighting signal, and displaying the rotation speed and the self-diagnosis result by switching between the rotation speed and the self-diagnosis result using the same display means of an engine tachometer. Device.