JPH0642982A - Bar indication type tachometer - Google Patents

Abstract

PURPOSE:To obtain a bar indicator tachometer alarming a user about a defective setting of an engine. CONSTITUTION:A bar indication tachometer 23 has an engine revolution number indicator 28 indicating the engine revolution number with a bar graph 24. It also has an alarm indication part 29 alarming by flashing at least a part of the bar graph 24 and a control means 21 driving an alarm indication part when the engine revolution number is below a specific revolution number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a small planing boat,
The present invention relates to a bar display type tachometer provided in a motorcycle or the like.

[0002]

2. Description of the Related Art For example, a small planing boat is equipped with a water jet propulsion device, and the water jet propulsion device has its engine arranged inside the hull, and a water injection unit driven by this engine is provided near the stern. Some are located at the bottom of the hull.

This engine speed is displayed on a tachometer, and is used to check the idle speed, use the engine at the limit of engine performance, or use it under optimal conditions such as fuel saving. The display of the engine speed of this tachometer is
For example, there is one that displays the engine speed in a bar graph.

[0004]

By the way, in an engine used in such a water jet propulsion device, for example, an idle speed is set, but the idle speed is not properly set, If the setting is too low, there are problems such as the engine stopping during idle operation.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a bar display type tachometer for warning a user of a setting failure of an engine.

[0006]

In order to solve the above problems, the present invention provides a bar display type tachometer having an engine speed display unit for displaying the engine speed in a bar graph, and at least a part of the bar graph. And an alarm display section for giving an alarm by blinking the display, and a control means for driving the alarm display section when the engine speed is equal to or lower than a predetermined speed.

[0007]

According to the present invention, when the engine speed is equal to or lower than the predetermined speed, at least a part of the bar graph is blinked to give an alarm to notify the user of engine setting failure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view of a small planing boat to which the present invention is applied.

In the figure, reference numeral 1 is a small planing boat, and the small planing boat 1 is provided with a water jet propulsion device 2.
The hull 3 of the small planing boat 1 is provided with a seat 4 on which an occupant sits and a steering handle device 5. An engine 6 of a water jet propulsion device 2 is arranged inside a hull 3 of a small planing boat 1, and a water injection unit 8 is arranged in a recess 7 formed at the bottom of the ship.

Both the engine 6 and the water injection unit 8 are connected by a power transmission shaft 9, and a suction duct 10 of the water injection unit 8 and this suction duct are provided at the bottom of the hull 3 of the small planing boat 1 near the stern. The injection nozzle 11 is provided on the stern side of the stern 10, and the impeller 12 driven by the power transmission shaft 9 is arranged in the suction duct 10. The hull 3 of the small planing boat 1 is provided with a meter display 20 in front of the handle device 5, and the control means 21 displays the engine operating state based on the information from the engine 6. The container 20 is shown in FIG.
It is configured as shown in.

FIG. 2 is a schematic configuration diagram of a meter display used in a small planing boat. Display unit 22 of meter display 20
At the center of, the engine speed is displayed as a bar graph 24. The bar graph 24 is composed of a plurality of segments, and each segment is lit to display the engine speed. That is, for example, the engine speed is 1200 rp, which is the predetermined idling speed.
When it reaches m, the leftmost segment in the figure lights up, and thereafter, the segment lights up one by one every time the engine speed increases by 500 rpm. Therefore, for example, if the leftmost segment is lit, the engine speed is 1200 to 1
It is shown to be between 700 rpm. A remaining fuel amount display 25 is arranged on the lower left side of the bar graph 24, and a water temperature warning display 26 is arranged on the lower right side.

The bar display type tachometer 23 has an engine speed display section 28 and an alarm display section 29 for flashing a part of the display of the bar graph 24 to give an alarm. Then, the alarm display unit 29 is driven by the control means 21. The engine speed 27 is input to the control means 21, and the engine speed display unit 28 is driven based on this to display the engine speed in a bar graph 24. Further, in the control means 21, the input engine speed is set to a predetermined idling speed (for example, 120
When the speed is 0 rpm or less, the alarm display unit 29 is driven to flash a part of the bar graph 24 to give an alarm.

Thus, for example, it is possible to inform the user that the engine speed setting in the idle speed range is too low, and the user appropriately sets the engine speed setting in the idle speed range based on this warning. Do it again.

FIG. 3 is a flowchart showing the operation of the bar display type tachometer, FIG. 4 is a front view of a bar graph of the bar display type tachometer which is not displayed, and FIG. 5 is a front view of a bar graph of the bar display type tachometer which is normally displayed. FIG. 6 is a front view of a bar graph in a blinking display of the bar display type tachometer.

In step a, it is judged whether or not the engine speed is the minimum engine speed, that is, the minimum engine speed at which the engine can keep rotating (for example, 300 rpm). When the engine is completely stopped (including the case where the engine is completely stopped), the bar graph 24 is not displayed as shown in FIG. 4 (step b). If the engine speed is equal to or higher than the minimum engine speed in step a,
In step c, it is determined whether the engine speed is a predetermined idling speed (for example, 1200 rpm),
When the idling speed is equal to or higher than a predetermined speed, as shown in FIG. 5, a segment is lit on the bar graph 24 in accordance with the engine speed to perform normal display (step d).

In step c, when the input engine speed is equal to or lower than the predetermined idling speed, as shown in FIG. 6, the lowest segment of the bar graph 24 is blinked to give an alarm (step e). . The blinking segment is
The segment is not limited to the lowest segment, but all or some of the segments that make up the bar graph 24 may blink. However, blinking only the lowest segment causes an abnormality in idling speed. This is preferable for informing the user of what happens to the. Also, the blinking cycle of the segment may be uniform regardless of the engine speed or may be changed according to the engine speed, that is, 0.5 seconds when the engine speed is between 300 and 800 rpm. When the interval is between 800 and 1200 rpm, the segments may be blinked at intervals of 1 second. When this is blinked, the user will set the idle speed to a proper value (for example, 1200 rpm).

In this embodiment, the lowest segment is made to blink when the engine speed is equal to or lower than the predetermined idling speed, but the present invention can be applied to the normal operating range. That is, since a transmission is not used in a small planing boat and the throttle opening and the engine speed correspond to each other at about 1: 1, the throttle opening and the engine speed are detected and the engine speed is set to the throttle opening. By blinking the number of segments corresponding to the engine speed when the engine speed is lower than the predetermined speed corresponding to the engine speed, it is possible to notify the user of the engine setting failure even in the normal operating region.

[0018]

As described above, according to the present invention, an alarm display section for alarming by flashing a part of the display of a bar graph, and a control means for driving the alarm display section when the engine speed is below a predetermined speed. Therefore, when the engine speed is equal to or lower than the predetermined speed, at least a part of the bar graph can be blinked to notify the user, and the user can set the idle speed appropriately, for example. Idle operation stabilizes.

[Brief description of drawings]

FIG. 1 is a side view of a small planing boat.

FIG. 2 is a schematic configuration diagram of a meter display used in a small planing boat.

FIG. 3 is a flowchart showing the operation of a bar display type tachometer.

FIG. 4 is a front view of a non-display bar graph of the bar display type tachometer.

FIG. 5 is a front view of a bar graph of a normal display of the bar display type tachometer.

FIG. 6 is a front view of a bar graph in a blinking display of a bar display type tachometer.

[Explanation of symbols]

 21 Control Means 23 Bar Display Tachometer 24 Bar Graph 28 Engine Speed Display 29 Alarm Display

Claims (1)

[Claims] 1. A bar display type tachometer having an engine speed display unit for displaying engine speed in a bar graph, and an alarm display unit for alarming by flashing at least a part of display of the bar graph, and the engine speed. A bar display type tachometer, comprising: a control unit that drives the alarm display unit when the number of rotations is equal to or less than a predetermined rotation number.