JPH07150972A - Operating condition display device for vehicle - Google Patents

Abstract

PURPOSE:To provide an operating condition display device for a vehicle in which the display of an abnormality code can be easily distinguished from that of actual engine speed even when the abnormlity code is displayed on an engine tachometer for example, and a plurality of sorts of abnormality codes can be displayed. CONSTITUTION:In an operating condition display device for a vehicle provided with an engine speed sensor 1, a display signal generating means generating a display signal corresponding to the engine speed, and an engine tachometer analogue-displaying the engine speed corresponding to the display signal, it is provided with an abnormality detecting means 6 detecting the abnormality of a fuel sender detecting a remaining quantity of fuel, and an abnormality display signal generating means generating an abnormality detected signal Sg1 to display zero rotation on the engine tachometer 3 and an abnormality code display signal Sg2 to display rotation near to the maximum engine speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying a driving state of a vehicle, and more particularly, the display device is used as an indicator for warning that an abnormality has occurred in a driving state detection circuit or the like. When it does, it relates to the improvement of the abnormal display method.

[0002]

2. Description of the Related Art Conventionally, a dedicated indicator lamp has been provided as a display device for displaying an abnormality in the driving state of a vehicle.
A method of lighting the lamp is common. However, this method has a problem in that the number of parts increases and a mounting space for the indicator lamp is required. As a method for solving this problem, as disclosed in Japanese Patent Laid-Open No. 1-134027, there is a method of displaying an abnormality on an existing engine tachometer, for example. 4 regardless of the number of rotations
An error code that codes the above error such as 000 rpm is displayed.

[0003]

However, in such a conventional display device, for example, the engine speed is 4000.
When the vehicle is traveling at a constant speed in the vicinity of rpm, there is a problem that it is unclear whether the display of the engine tachometer indicates an abnormal code or an actual engine speed.

In order to solve this problem, there is a method of displaying a rotational speed that greatly differs from the actual engine rotational speed as an abnormal code, but with this method, it is difficult to display a plurality of types of abnormal codes. There is a problem.

The present invention has been made in view of the above-mentioned conventional problems. For example, when an abnormal code is displayed on an engine tachometer, it is easy to distinguish the abnormal code display from the actual engine speed display. It is an object of the present invention to provide a driving state display device for a vehicle that is capable of displaying a plurality of types of abnormality codes.

[0006]

According to a first aspect of the present invention, there is provided a driving state detecting means for detecting a driving state of a vehicle, a display signal generating means for generating a display signal according to the detected driving state, and In a driving state display device for a vehicle, which comprises a display means for displaying a vehicle driving state in accordance with a display signal, an abnormality detecting means for detecting an abnormality in the vehicle driving state, and when the abnormality is detected, an abnormality is displayed in the display means. An abnormal condition display signal generating means for generating an abnormal condition detection signal for displaying that the abnormal condition is detected, and subsequently generating an abnormal code display signal for displaying an abnormal code encoding the abnormal condition on the display means. It is characterized by having and.

According to a second aspect of the present invention, in the first aspect, the operating state detecting means is an engine speed sensor for detecting the engine speed, and the display means is an engine tachometer for displaying the engine speed in an analog manner. The abnormality detecting means is configured to detect an abnormality of the fuel remaining amount detecting circuit for detecting the fuel remaining amount, and the abnormality time display signal generating means is configured to detect the abnormality of the fuel remaining amount detecting circuit by the engine tachometer. It is characterized in that it is configured to generate an abnormality detection signal for displaying zero rotation and an abnormality code display signal for subsequently displaying rotation near the maximum rotation speed. It should be noted that the abnormality referred to in the present invention is intended for those that do not lead to engine damage or the like immediately after the occurrence of the abnormality because some kind of evacuation action is taken.

[0008]

According to the vehicle operating condition display device of the present invention, when the abnormality detecting means detects an abnormality, the abnormal time display signal generating means generates the abnormality detecting signal and the subsequent abnormality code displaying signal. The display means indicates that the abnormality is detected by the abnormality detection signal, and the abnormality code is displayed by the abnormality code display signal.

As described above, according to the present invention, the fact that the abnormality is detected is displayed first, and then the display according to the content of the abnormality is displayed. Therefore, the display of the display means is a normal operation state display. It is possible to easily determine whether or not it is an abnormal code display at the time of abnormality.

According to the vehicle operating condition display device of the present invention, when an abnormality such as a disconnection of the fuel remaining amount detection circuit is detected, the abnormality time display signal generating means causes the abnormality detection signal and the abnormality code display signal. , Which causes the engine tachometer to first display zero revolutions and then to display revolutions near the maximum revolution, so that the engine tachometer display is a normal engine revolution display, or It is possible to easily determine whether or not the abnormal code is displayed at the abnormal time.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are diagrams for explaining a vehicle driving state display device according to an embodiment of the invention of claims 1 and 2, and FIG. 1 is a diagram schematically showing the configuration of the display device. Is a circuit diagram for explaining a failure detection device adopted in the display device, FIG. 3 is a graph showing the display of the engine tachometer with respect to time during normal operation of the display device, and FIG. 4 is an abnormal operation of the display device. It is a graph which shows the display of the engine tachometer with respect to time in time.

In FIG. 1, reference numeral 1 denotes an engine speed sensor for detecting an engine speed of a vehicle. The speed sensor 1 is connected to a control unit 2 which controls the detected engine. The display signal corresponding to the rotation speed is generated to cause the tachometer 3 to analogically display the engine rotation speed.

In FIG. 2, V indicates a power supply voltage, and an indicator lamp 5 having a resistance R1 and a fuel level detecting fuel sender 4 having a resistance R2 are connected in series between the power supply voltage V and the ground. They are connected to each other, and the remaining fuel amount detection circuit 6 is configured thereby. Here, the resistance value of the resistor R2 at room temperature is set to be significantly larger (for example, about 100 times) than the resistance value of the resistor R1. Further, the fuel sender 4 uses a thermistor whose resistance significantly decreases as the temperature rises.

The control unit 2 functions as an abnormality detection means (fault detection device) for detecting an abnormality such as a disconnection of the fuel remaining amount detection circuit 6, and when the abnormality is detected, an abnormality detection signal is output. Sg1 and abnormal code display signal Sg
It also functions as an abnormal display signal generating means for generating 2 and. The abnormality detection signal Sg1 indicates zero rotation, and the abnormality code display signal Sg2 indicates rotation near the maximum rotation number on the engine tachometer 3.

The failure detecting device is provided between the switch means 8 provided between the first and second resistors R1 and R2, the connection point between the switch means 8 and the resistor R2, and the power supply. The pull-up resistor Rp having a resistance value substantially equal to that of the resistor R2 and the pull-up resistor Rp of the resistor R2 expressed by the formula (1) are turned off during the abnormality detection operation. And a partial pressure detecting means 7 for detecting the pressure Vd. Vd = R2 / (Rp + R2) × V ... (1)

The switch means 8 is connected between a diode 9 provided so that the direction from the resistor R1 to the resistor R2 is the forward direction, and a connection point between the diode 9 and the resistor R1 and ground. It is composed of an NPN transistor 10.

Next, the function and effect of the display device of this embodiment will be described. When the remaining fuel amount is equal to or higher than the disposition level of the fuel sender 4, the resistance R2 is large and the indicator lamp 5 does not light. However, when the remaining fuel amount is equal to or lower than the level, the resistance R2 becomes small and the indicator lamp 5 lights. The remaining fuel amount detecting function is the same as the conventional one.

At the failure detection timing of the remaining fuel amount detection circuit 6, the voltage dividing detection means 7 turns on the transistor 10 for 10 ms, for example. Then, the diode 9 functions as a switching element and turns off between the resistors R1 and R2. The partial pressure detecting means 7 detects the partial pressure Vd at this time. If the partial pressure Vd is approximately 1/2 V, it is normal. If not, it is determined to be abnormal due to disconnection of the fuel sender 4 from the control unit 2 at the point C in the figure, and the control unit 2 After displaying zero revolutions on the engine tachometer 3, the revolutions near the maximum number of revolutions are displayed. It should be noted that when the transistor 10 is turned on, a current flows through the indicator lamp 5, but since it is for an extremely short time, it does not come on. Further, when the ignition switch is turned on, the voltage division detecting means 7 causes the transistor 10.
The indicator lamp 5 is turned on for about 4 seconds. This makes it possible to check the disconnection of the indicator lamp 5 itself.

Now, the abnormality detection display and the abnormality code display by the engine tachometer 3 will be specifically described with reference to FIGS. 3 and 4. In the normal operation state of the vehicle, the display of the rotation speed of the tachometer 3 changes as shown in the graph G1 of FIG. On the other hand, when the control unit 2 detects an abnormality such as disconnection of the fuel sender 4, the abnormality detection signal Sg
1 and the subsequent abnormal code display signal Sg2 are output. As a result, as shown by the solid line graph G2 in FIG. 4, the tachometer 3 displays 0 rpm indicating abnormality detection for 1 second, and then displays 8000 rpm near the maximum rotation number indicating fuel sender disconnection for 2 seconds. After that, the engine speed detected for 3 seconds is displayed, and this cycle is repeated. If you want to display multiple types of codes,
The abnormal code that is different for each cycle is displayed. For example, if the throttle valve position sensor system fails, 10,000 rpm is displayed, and if the side stander switch system fails, 9000 rpm is displayed.

As described above, in this embodiment, the control unit 2
When the engine detects an abnormality on the fuel sender 4 side, the engine tachometer 3 is caused to display the abnormality, so that the abnormality can be displayed without providing a dedicated indicator. Then, in this abnormality display, the engine tachometer is made to display 0 rpm and then 8000 rpm. Therefore, it is judged whether or not the display of the engine tachometer 4 is an abnormality code at the time of abnormality. It can be done easily. In particular, since the range of deflection of the pointer is large from 0 rpm to 8000 rpm, it is easy to confirm. It is also possible to display a plurality of different abnormal codes.

Further, between the resistor R1 and the resistor R2,
A switch means 8 including a diode 9 and an NPN transistor 10 is provided, and the resistor R1 and the pull-up resistor R are provided.
Since the voltage division between the resistor R2 and the pull-up resistor Rp is detected by switching between p and p, even if the resistor R2 is significantly larger than R1, abnormality such as disconnection of the remaining fuel amount detection circuit 6 can be accurately detected. Can be detected.

In the above embodiment, the abnormality detection display is 0.
Although the case where the rpm and the abnormal code display are 8000 rpm and the like is shown, it goes without saying that these displays are not limited to such rpm. Further, the display means is not limited to the engine tachometer, and may be, for example, a thermometer, a hydraulic pressure gauge,
Existing fuel gauges can be used.

[0023]

As described above, according to the driving state display device for a vehicle according to the invention of claim 1, when the abnormality of the vehicle driving state is detected, the abnormality detection signal and the abnormality code display signal are generated. The time display signal generating means is provided to display that an abnormality has been detected first and then to display according to the content of the abnormality. It is possible to easily determine whether or not the abnormal code is displayed, and it is possible to display a plurality of types of abnormal codes.

According to the vehicle operating condition display device of the second aspect of the invention, when an abnormality such as a disconnection of the fuel remaining amount detection circuit is detected, an abnormality detection signal and an abnormality code display signal are generated. Since the engine tachometer first displays zero rotation and then the rotation near the maximum rotation, it is judged whether the engine tachometer display is the normal engine speed or the abnormal code display. In addition to the effect that it is possible to easily perform, it is possible to display a plurality of types of abnormal codes.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration of a vehicle driving state display device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram for explaining a failure detection circuit adopted in the display device of the above embodiment.

FIG. 3 is a characteristic diagram for explaining the display of the engine tachometer when the display device of the embodiment is normal.

FIG. 4 is a characteristic diagram for explaining the display of the engine tachometer when the display device of the embodiment is abnormal.

[Explanation of symbols]

1 engine speed sensor (operating state detection means) 2 control unit (abnormality detection means, display signal generation means,
Abnormal time display signal generating means) 3 Engine tachometer (display means) 6 Fuel remaining amount detection circuit Sg1 Abnormality detection signal Sg2 Abnormality code display signal

Claims (2)

[Claims] 1. A driving state detecting means for detecting a driving state of a vehicle, a display signal generating means for generating a display signal according to the detected driving state, and a vehicle driving state according to the display signal. In a vehicle driving state display device including a display means, an abnormality detecting means for detecting an abnormality in a vehicle operating state, and an abnormality detection for displaying the detection of the abnormality on the display means when the abnormality is detected. A vehicle characterized by including an abnormal time display signal generating means for generating a signal and subsequently generating an abnormal code display signal for displaying an abnormal code encoding the abnormal state on the display means. Operating status display device. 2. The operating state detecting means is an engine speed sensor for detecting an engine speed, the display means is an engine tachometer for displaying the engine speed in an analog manner, and the abnormality detecting means is an abnormality detecting means. It is configured to detect an abnormality of the fuel remaining amount detection circuit for detecting the fuel remaining amount, and the abnormal time display signal generating means displays zero rotation on the engine tachometer when the fuel remaining amount detection circuit is abnormal. An operating condition display device for a vehicle, which is configured to generate an abnormality detection signal for causing the rotation and an abnormality code display signal for displaying the rotation near the maximum rotation speed.