JPH0235136B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a turbo indicator device for supercharged engines such as motorcycles and automobiles, and in particular,
A turbo with a simple configuration that allows more accurate turbo operation status to be displayed by incorporating the throttle opening condition into the display device that displays the turbo operation status in relation to the pressure in the intake passage such as the surge tank. Relating to an indicator device.

[Technical Background of the Invention] A turbo indicator device has the simplest configuration in which a pressure switch is provided in the intake passage, for example a surge tank, and the on/off operation of the pressure switch is indicated by a lamp provided in the driver's seat. There is a switch method. Additionally, a pressure sensor system is also used in which a pressure sensor is provided to detect pressure changes in the surge tank, and the voltage detected by the pressure sensor is displayed on a voltmeter or a liquid crystal display.

[Problems with Background Art] However, these conventional indicator devices have major drawbacks. That is, since both of them use the surge tank pressure as is, they do not display the actual turbo operating state of the engine. For example, when the vehicle shifts from acceleration to deceleration, there is residual pressure in the surge tank, and this residual pressure is displayed as if the engine were in turbo mode.

In the system in which a pressure switch is provided in the surge tank, in addition to the residual pressure phenomenon described above, there is also a hysteresis phenomenon of the switch, and when transitioning from acceleration to deceleration, the display appears as if the turbo is operating for a while. In addition, in the method of displaying the detected voltage of the pressure sensor on, for example, a liquid crystal display, a high voltage position is displayed when the transition from acceleration to deceleration occurs, and even though the throttle is closed, it is still in the turbo operation state. This creates an illusion.

However, the turbo indicator is provided for the driver's reference, and some errors may be tolerated. However, as mentioned above, when transitioning from acceleration to deceleration, it is displayed as if the turbo is operating for a while until the pressure in the surge tank decreases, which is unnatural and gives the driver a sense of discomfort. It is not desirable because it gives

[Object of the Invention] The present invention is intended to improve the above-mentioned problems, and it is an object of the present invention to provide a turbo indicator device that has a simple configuration and can more accurately display the turbo operating state of an engine.

[Structure of the Invention] To achieve the above object, a turbo indicator device according to the present invention is provided with a pressure detector that detects that the pressure in the intake passage is above a predetermined value, and the throttle valve opening is above a predetermined value. an opening detector for detecting the opening, and a display device that displays that the pressure in the intake passage is equal to or higher than a predetermined value on the condition that the opening detector detects a case where the opening is larger than the idle opening. It is characterized by having been established.

FIG. 1 shows a configuration block diagram of the present invention, and FIG. 2 shows its control flowchart. A supercharger 4 provided in the engine 2 pressurizes a surge tank 6 and supplies pressurized air to a carburetor 10 having a throttle valve 8. A pressure detector 12, such as a pressure switch or a pressure sensor, which can detect that the surge tank 6 has a predetermined value or more is provided. Further, an opening detector 14, such as an idle switch or a throttle switch, is provided to detect that the opening of the throttle valve 8 of the carburetor 10 is above a certain value. The display device consists of a display and a control section, and the detected values of the pressure detector 12 and the opening degree detector 14 are both input to the control section 16 and output to the display 18, for example, a lamp, a voltmeter, or a liquid crystal display. It is used to display the required information.

The control state of the control section 16 will be explained with reference to the flowchart shown in FIG. In step 110, the detected pressure value of the surge tank is determined. If the pressure is higher than the predetermined pressure, the process moves to step 120, and the throttle valve 8 is opened at step 120.
is larger than the idle opening. If the opening is above a certain degree, it is determined that supercharged air is being supplied to the engine and the turbo is operating, and the process moves to step 130. In step 130, a display indicating that the turbo is in operation is displayed, that is, if the display is a lamp, it lights up, or if it is a liquid crystal display, an appropriate numerical display is made. In step 140, it is displayed that supercharging is not in progress, for example, by extinguishing a lamp or appropriately indicating on the liquid crystal display that supercharging is not in progress.

[Examples of the Invention] This invention will be described below with reference to Examples.

First example FIG. 3 is an electrical circuit diagram showing the first embodiment.

A pressure detector (pressure switch) 12 is connected in series with a battery 20, a fuse 22, a key switch 24, and an indicator (lamp) 18. Further, a b contact 26 is connected in series, which opens the circuit in response to an on signal from the throttle valve opening detector (idle switch) 14. It is assumed that the opening degree detector 14 is turned off when the throttle valve is opened.

With the above configuration, even if the pressure in the surge tank 6 increases, if the b contact 26 is opened, that is, if the opening degree detector 14 is turned on, the indicator 18 will not light up.

As is clear from the description of the first embodiment, the configuration is extremely simple, but when moving from acceleration to deceleration,
Since the indicator turns off at the same time as the throttle valve is closed, it is possible to accurately indicate that the engine is not in turbo operation.

Second example FIG. 4 is an electrical circuit diagram showing the second embodiment.

D ₁ and D ₂ are diodes, R is an adjustment resistor,
When the pressure sensor turns on, the transistor
T ₁ is made conductive, and transistor T ₂ is made conductive to turn on the display 18. Also, transistor T ₂
An opening detector (idle switch) is installed at the base point A of
One terminal of 14 is connected.

The opening detector 14 turns on when the throttle valve is closed, and drops the voltage at the base point A of the transistor _T2 . Therefore, the indicator is lit on the condition that the throttle valve is opened to a degree greater than the idle opening.

In the second embodiment, the configuration is relatively simple, and since transistors are used, the contact capacitance of the pressure detector and the opening detector can be reduced.

Third Embodiment FIG. 5 is a logic circuit diagram showing a third embodiment.
An AND circuit 26 combines the ON signal of the pressure detector 12 provided in the surge tank and the inverted signal output by a knot circuit 28 from the opening detector 14, which outputs an OFF signal when the throttle valve is open. If the opening degree detector 14 outputs an ON signal when the throttle valve is open, a knot circuit is not necessary. The output signal of the AND circuit 26 is appropriately amplified and the display 18 is turned on.

The logic circuit according to the third embodiment can be easily realized using a commercially available IC circuit or an already installed microcomputer.

Fourth Embodiment FIG. 6 shows a fourth embodiment, in which a microcomputer is applied.

The detection signal from the pressure detector 12 provided in the surge tank and the detection signal from the throttle valve opening detector 14 are outputted to the microcomputer 30 for logic processing as described in the third embodiment, for example. The output signal from the microcomputer 30 is sent to the display 18 via the display driver 32. Although the display 18 is shown as a lamp, it may be an LED or a liquid crystal display. Further, the pressure detector 12 may be a pressure sensor instead of a pressure switch, and the display contents may be changed depending on the detected pressure. In this case, if the turbo operating state is to be displayed in analog form, the display value may be reduced when the throttle valve is at idle opening. Note that the opening detector 14 is not limited to an idle switch, and may of course be any control element related to the throttle opening such as turning on/off the accelerator.

Microcomputer 30 in the fourth embodiment
Of course, if the engine control unit 34 is built into the engine control unit 34, it can be used.

Incidentally, in the above-mentioned embodiment, an example in which the pressure detector was provided in the surge tank was explained. Of course, the detector may be provided at any location in the intake passage where the boost pressure can be detected.

[Effects of the Invention] As is clear from the description of the embodiments above, the turbo indicator device according to the present invention indicates that the pressure in the surge tank is above a certain value when the throttle valve is larger than the idle opening. Since the display is assumed to be activated, not only can existing opening degree detectors (idle switches) etc. be used, but the configuration is simple, turbo display can be performed more accurately, and the driver's turbo It is highly effective as it can eliminate any sense of incongruity regarding the indicator.

[Brief explanation of drawings]

FIG. 1 shows a configuration block diagram, and FIG. 2 shows a control flowchart. FIG. 3 is an electric circuit diagram showing the first embodiment, and FIG. 4 is an electric circuit diagram showing the second embodiment. FIG. 5 is a logic circuit diagram showing the third embodiment, and FIG. 6 is a block diagram showing the fourth embodiment. In the figure, 2 is an engine, 4 is a supercharger, 6 is a surge tank, 8 is a throttle valve, 10 is a carburetor, 12 is a pressure detector, 14 is an opening detector, 16
18 is a display, 30 is a microcomputer, and 34 is an engine control unit.

Claims (1)

[Claims] 1. A pressure detector is provided to detect that the pressure in the intake passage is greater than or equal to a predetermined value, and an opening detector is provided to detect that the throttle valve opening is greater than or equal to a predetermined value. 1. A turbo indicator device comprising: a display device that displays the fact that the pressure in the intake passage is equal to or higher than a predetermined value, indicating that the pressure is in the turbo operation.