JPH0414301Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic engine stop/restart device, and particularly to a device that controls a warning buzzer when the engine automatically stops.

[Prior Art] In recent years, some vehicles such as buses have a system that automatically stops the engine when the vehicle stops at an intersection etc. and the engine speed becomes equal to the engine speed when idling. The engine is equipped with an automatic engine stop/restart device (hereinafter referred to as an idle stop/start device) that automatically turns on the starter switch and restarts the engine when the clutch pedal is depressed. By installing such an idle stop/start device, it is possible to save fuel when the engine is idling and also to reduce exhaust gas.

[Problems to be Solved by the Invention] By the way, in the idle stop-start device, the engine stops when the vehicle is stopped, and the oil pressure of the engine accordingly decreases.

Conventionally, general vehicles have been equipped with a warning device for a drop in engine oil pressure as shown in FIG.
That is, when the oil pressure decreases, the oil pressure switch 31
In the ON state, the warning lamp 32 lights up and the relay 33 is energized, and the switch 34 is closed by the relay 33. At this time, if the handbrake is not applied, current flows through contact a of the handbrake switch 35 to the alarm buzzer 36, causing the alarm buzzer 36 to sound. If you pull the handbrake at this point, the handbrake 35 will be at contact point b.
When the vehicle is switched to the side, the warning buzzer 36 stops sounding and the parking lamp 37 lights up.

Since such a warning device was provided, each time the engine was automatically stopped by the idle stop/start device, the oil pressure of the engine would drop and the warning buzzer would sound. The sound of this warning buzzer is generally very noisy and is a nuisance to passengers when the vehicle is a bus or the like. Therefore, the driver is required to pull the handbrake to stop the warning buzzer from sounding each time the engine is automatically stopped, making the operation complicated.

Thus, the purpose of the present invention is to solve the above-mentioned problems of the prior art and provide an automatic engine stop/restart device that does not cause inconvenience to passengers or complicate operations by the driver each time the engine automatically stops. It's about doing.

Incidentally, as a related prior art, there is an "engine automatic stop/start device" (Japanese Utility Model Application Publication No. 188833/1983).

[Means for solving the problem] In order to achieve the above-mentioned purpose, the engine automatic stop/restart device of the present invention has a first warning buzzer that warns you if you forget to apply the handbrake, and a first warning buzzer that warns you if you forget to apply the handbrake. The second alarm warns of low oil pressure.
In addition to cutting off the power to the alarm buzzer,
and control means for energizing the alarm buzzer.

[Function] With this configuration, when the engine is automatically stopped, the control means cuts off the power to the second warning buzzer for warning of low oil pressure, and prohibits the operation of the second warning buzzer. The first warning buzzer for warning of forgetting to apply the handbrake will start operating. That is, even if the oil pressure of the engine decreases due to automatic engine stop, the second warning buzzer does not sound, but instead, the first warning buzzer sounds in response to forgetting to apply the handbrake. Therefore, if you use a high-sound-pressure one as the second warning buzzer, and use a low-frequency, low-sound-pressure buzzer as the first warning buzzer, you can avoid forgetting to pull the handbrake when the engine automatically stops. You can only give a silent warning to someone. Therefore, the driver does not have to pull the handbrake every time the vehicle automatically stops.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of an automatic engine stop/restart device according to an embodiment of the present invention. In the figure, 1 is a control circuit that controls the automatic stop/restart function of the engine, and the output terminal 2 has a high potential only during automatic stop.
A relay 3 is connected to this output terminal 2.

Further, a normally open hydraulic switch 4, which is automatically closed when the engine oil pressure decreases, is connected to a terminal d of a 2-circuit, 4-terminal changeover switch 5, and a power source is connected to a terminal e via a relay 6. There is. Furthermore, a warning lamp 7 is provided in parallel with the series circuit of the changeover switch 5 and the relay 6. A contact a of a handbrake switch 8 is connected to a terminal f of the changeover switch 5, and a power source is connected to a terminal g via an alarm buzzer (first alarm buzzer) 9 for warning of forgetting to apply the handbrake. In addition, an alarm buzzer (second
The power supply is connected in series through a normally open switch 11 which is controlled to open and close by an alarm buzzer) 10 and a relay 6.
A power source is connected to each contact point b via a parking lamp 12.

The switching operation of the changeover switch 5 is controlled by the relay 3, and when the relay 3 is not energized, the terminals d and e are made conductive, and when the relay 3 is energized, the terminals f and g are made conductive. . Further, in the handbrake switch 8, the contact a side is connected to the contact point c when the handbrake (not shown) is not pulled, and the contact point b side is connected to the contact point c when the handbrake is pulled. Further, as the first alarm buzzer 9, a one that emits an intermittent sound with a low sound pressure at a low frequency was used, and as the second alarm buzzer 10, a one with a large sound pressure was used.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

First, when the engine (not shown) is driven, various outputs from various sensors and switches are input to the control circuit 1, and the control circuit 1 determines whether the conditions for automatic stop are satisfied based on the input signals. Make a judgment (process 21).

The condition for this automatic stop is, for example, when the following conditions are met simultaneously.

Engine rotation 800rpm or less Vehicle speed 0km/h Neutral and engine room door closed Clutch pedal is released.

Water temperature: 40℃ or more Air pressure: 6.5Kg/cm ² or more As a result of this judgment, if the conditions are not met, that is, during normal driving when automatic stop is not activated, relay 3 is not energized and terminals d and e of selector switch 5 are is connected. Therefore, in this state, if the engine oil pressure decreases for some reason and the oil pressure switch 4 is turned on, the warning lamp 7 will light up.
lights up, relay 6 is energized, and switch 11 is activated.
is closed. As a result, if the handbrake is not applied, the handbrake switch 8 is connected to the contact a side, and the second alarm buzzer 10 sounds loudly. This blowing sound is stopped by pulling the handbrake and switching the handbrake switch 8 to the contact b side.

On the other hand, as a result of process 21, if the conditions are met, the engine is stopped by the control circuit 1 (process 22).

When the engine is stopped, a high potential is output to the output terminal 2 of the control circuit 1, thereby exciting the relay 3 (process 23). That is, terminals f and g of the changeover switch 5 are connected, and terminals d and e are disconnected. Therefore, even if the oil pressure decreases as the engine stops and the oil pressure switch 4 is turned on, the warning lamp 7 will light up, but the relay 6 will not be energized.
The second alarm buzzer 10 no longer sounds. Instead, the first alarm buzzer 9 is activated via the changeover switch 5 to contact a of the handbrake switch 8.
Since the first alarm buzzer 9 sounds if the handbrake is not applied. Since the buzzer 9 emits intermittent sounds with low sound pressure, it is possible to send a warning only to the driver without bothering passengers. Therefore, the driver can wait for the engine to restart by sounding the first warning buzzer 9 without pulling the handbrake (process 24).

The conditions for restarting are, for example, the engine rotation is 0 rpm, the engine compartment door is closed, and the clutch pedal is depressed. When these conditions are met at the same time, the engine is restarted by the control circuit 1 (process 25). ).

Then, the high potential is no longer output to the output terminal 2 of the control circuit 1, so the relay 3 is not energized (processing
26), thereby returning the changeover switch 5 to its normal state. That is, terminals d and e are connected.

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects are exhibited.

(1) When the engine automatically stops, a quiet buzzer sounds to warn you if you forget to pull the handbrake.
There is no need to pull the handbrake each time, making the operation easier.

(2) No more inconvenience to passengers every time the engine automatically stops.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an automatic engine stop/restart device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the embodiment, and FIG. 3 is a block diagram of a conventional warning device. In the figure, 1 is a control circuit, 3 is a relay, 4 is a hydraulic switch, 5 is a changeover switch, 8 is a handbrake switch, 9 is a first alarm buzzer, and 10 is a second alarm buzzer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In addition to cutting off power to the first alarm buzzer that warns you if you forget to apply the handbrake and the second alarm buzzer that warns you of low engine oil pressure when the engine automatically stops. An automatic engine stop/restart device comprising: control means for energizing the first warning buzzer. (2) The device according to claim 1, wherein the first warning buzzer emits an intermittent sound.