JPH02124327A - Engine stop switch - Google Patents

Abstract

PURPOSE:To improve the degree of freedom of controlling by providing right/left sensors for detecting the existence of both hands of a controller on the right/left grip portions of a water motorcycle, etc., and stopping an engine at the time of the minimum necessity of detecting no both-hand condition. CONSTITUTION:A pair of right/left sensor bodies 3A, 3B are provided on a pair of right/left grip portions of a water motorcycle, etc., respectively. The right hand sensor body 3A, for example, is formed by combining a light emitting element 31A and a light receiving element 32A while connecting a sensor driving circuit 4 consisting of an oscillator 4a and an amplifier 4b to the light emitting element 31A. Infrared light from the light emitting element 31A is reflected by the hand of a controller and reaches the light receiving element 32A, to detect the existence of the controller by a detecting circuit 6A via a front amplifier 5A. Also, an engine stop signal generating circuit 8 is driven only at the time of detecting no existence of both right/left hands of the controller by means of both right/left detecting circuits 6A, 6B.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an engine stop switch that is attached to the handle of a watercraft, snowmobile, or the like.

[Conventional technology]

A conventional engine stop switch of this type is shown in FIG. 5. In most cases, a sensor body 103 is provided on the accelerator grip 102 on the right side of the steering wheel 101 to detect the presence or absence of the driver's hand. If a hand is not detected, it is determined that the pilot has fallen, and when this determination is made, the engine is stopped at an appropriate time using a timer or the like. Because it is predicted that runaway water bites could cause a more serious accident, an engine stop switch like this is installed to ensure that the engine always stops near the operator.

[Problem to be solved by the invention]

However, since the conventional method described above detects the presence or absence of the operator based only on the presence or absence of the accelerator grip, that is, the right hand, from the opposite perspective, it is impossible for the operator to take his right hand off the grip. This has resulted in severe inconvenience due to restrictions on their actions, such as during emergency work.

[Means to solve the problem]

The present invention provides a sensor unit that detects the presence or absence of an occupant's hand, which is comprised of a sensor drive circuit, a sensor body, a preamplifier circuit, and a detection circuit, as a specific means for solving the problems that occur with the conventional engine stop switch described above. At least one sensor body is provided on each of the left and right grips, the signals from each sensor are passed through an OR circuit, and the output from the OR circuit drives an output circuit that generates an engine stop signal. By providing a stop switch, the above-mentioned conventional problems can be solved by allowing the right hand to be used freely.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. What is indicated by the reference numeral 1 in FIG. 1 is, for example, a handle for a waterborne bar.To explain in more detail, the handle 1 is composed of a right side bar IA and a left side bar IB.
, IB has a right grip 2A1 and a left grip 2B respectively attached. Here, according to the present invention, a right sensor body 3A and a left sensor body 3B using an infrared system are respectively attached to both the right grip 2A and the left grip 2B, and the right sensor body 3A is operated by the right grip 2A. The operator's hand (not necessarily the right hand in this case) is detected, and the left sensor body 3B similarly detects that the operator's hand is on the left grip 2B. What is shown in FIG. 2 is a block diagram showing the pilot detection method according to the present invention including the sensor body 3A13B, and since the left and right sides have almost the same configuration, the right sensor body 3A will be mainly described here. explain. The right sensor main body 3A includes a right light emitting element 31A such as an infrared emitting LED and a right light receiving element 32A such as a photodiode.
A sensor drive circuit 4 consisting of an oscillator 4a and an amplifier 4b is connected to the right light emitting element 31A, and the sensor drive circuit 4, which is composed of an oscillator 4a and an amplifier 4b, is connected to the right light emitting element 31A. It lights up in a blinking manner and can be distinguished from external light such as sunlight. If the driver's hand is present at this time, the infrared light from the right light emitting element 31A will be reflected and reach the right light receiving element 32A. After the above-mentioned external light (DC component) portion is removed by a bandpass filter having the same passing frequency band, a level determination is performed by the right side detection circuit 6A, and the presence or absence of the driver is thereby determined. Similar detection is performed by the left sensor body 3B1 and the left preamplifier 5B.
1 is also performed on the left side detection circuit 6B side, the outputs of the left and right detection circuits 6A and 16B are applied to the input of the OR circuit 7, and the output of the OR circuit 7 is used to apply the output to the delay circuit 8A.
and an output circuit 8b.
is driven. Here, the OR circuit 7 has a positive logic (OR) as shown in the figure.
gate), the delay circuit 8a is activated when there is no output from the OR circuit 7, that is, at the "O" level, so that the delay circuit 8a is activated to both the right sensor body 3A and the left sensor body 3B. It will start only when there is no. By doing this, the engine will not stop when the operator operates the steering wheel with either his right or left hand, greatly increasing the degree of freedom. The sensor drive circuit 4 may be provided to share the left and right light emitting elements 31A and 31B as shown in the figure, or may be provided exclusively for each of the light emitting elements 31A and 31B. In this case, by making the oscillation frequencies different from each other, it is also possible to reduce the respective crosstalks. Further, the sensor provided on the grip may include only the main body 3A13B, up to the preamplifier circuit 5A15B, or up to the detection circuit ClA16B. Furthermore, in this embodiment, the sensor body uses infrared rays, but in practice, any type of sensor body may be used, such as a pressure-sensitive type or an electrostatic type.In short, sensors are provided on both the left and right sides, and The gist of the present invention lies in passing both of them through an OR circuit, and it goes without saying that the above changes do not impair the gist of the present invention. Next, what is shown in Fig. 3 is an example of further improvement obtained as a result of repeated field tests to realize the present invention, and the operability of the water bite has been greatly improved by the previous example. This has made it virtually impossible for the engine to stop due to malfunction during normal use. However, in special applications such as water bites used for patrol, it is often necessary to take both hands off the handle, and there is a desire to stop the engine each time, which is cumbersome. It was made for the purpose of The reference numeral 9 in FIG. 3 is a pressure-sensitive switch, and the pressure-sensitive switch 9 is preferably made of, for example, conductive rubber and has a low immersion pressure and is used as a tact switch. The sensor body 3A13B1 is arranged between the skin 10a of the seat section 10 and the cushion tob to detect whether or not an occupant is seated.
The pressure-sensitive switch 9 is provided in addition to the preamplifier 5A15B1 and the detection circuit 6A16B, and the pressure-sensitive switch 9 has one terminal connected to a power supply and the other terminal connected through a resistor R, as shown in FIG. is grounded, and produces a high level output when the occupant is seated, and a low level output when the occupant is not seated, and this output is applied to the input of the OR circuit 17 in addition to the output of the detection circuit 6A18B. With the above configuration, the engine stop signal generation circuit 8
When using the water bites mentioned above, release both hands from the handle,
In addition, the signal is output only when the occupant is not seated in the seat section 10, and this condition is almost completely inconceivable except for the occupant falling into water, thus further improving the accuracy of detecting the occupant falling into water. At the same time, it gives the occupants more freedom in driving operations.

【Effect of the invention】

As explained above, according to the present invention, sensor sections are provided on the left and right grips, and signals from the respective detection circuits are passed through an OR circuit, and when there is no output to the OR circuit, an engine stop signal is output. By using an engine stop switch, the engine will not stop even if the operator operates the steering wheel with either the left or right hand.
This has the excellent effect of increasing the degree of freedom in driving operations. In addition, a pressure-sensitive switch is provided in the seat, and the output of this switch is also input to the OR circuit to further improve detection accuracy and increase the degree of freedom in driving operations.
This has the effect of further improving the practicality of this type of engine stop switch.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of an engine stop switch according to the present invention, FIG. 2 is a block diagram showing a detection method of the same embodiment, and FIG. 3 is a main part of another embodiment of the present invention. FIG. 4 is a block diagram showing the detection method of the same embodiment, and FIG. 5 is a perspective view showing a conventional example. 1...Handle IA...Right side bar IB...Left side par 2A...Right side grip 2B...Left side grip 3A...Right side sensor body 31A...Right side light emitting element 32A...Right side light receiving element 3B... Left side sensor main body 31B... Left side light emitting element 32B... Left side light receiving element 4... Sensor drive circuit 4a... Oscillator 4b... Amplifier 5A... Right side preamplifier 5B... Left side preamplifier 6A... Right side detection circuit 6B... Left side detection circuit 7... OR circuit 8... Engine stop signal generation circuit 8a... Delay circuit 8b... Output circuit 9. ... Pressure sensitive switch 10 ... Seat section

Claims (3)

[Claims] (1) At least the sensor body of the sensor section, which is composed of a sensor drive circuit, a sensor body, a preamplifier circuit, and a detection circuit and detects the presence or absence of an occupant's hand, is provided on the left and right grips respectively, and the signals from each sensor are logically An engine stop switch characterized in that the output from the OR circuit drives an output circuit that generates an engine stop signal via a sum circuit. (2) The sensor unit provided on either side of the left and right grips is a sub-sensor unit including only the sensor body and the preamplifier circuit. Engine stop switch. (3) Claims (1) and (2) are characterized in that a pressure-sensitive sensor is provided in the seat portion to detect whether the occupant is seated, and the output of the pressure-sensitive sensor is also input to the OR circuit.
) Engine stop switch listed in section.