JPS597549Y2 - Engine speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine rotation speed control device for a vehicle equipped with a hydraulic system using a vehicle running engine as a drive source.

In a vehicle that uses a vehicular travel engine to drive a hydraulic system, in order to operate the hydraulic system efficiently, the set minimum rotational speed of the engine is increased when the hydraulic system is in use, and when the hydraulic system is no longer in use. When the vehicle is put into motion, the set minimum engine speed must be reduced to the idle speed.

In the past, the above set minimum rotation speed was adjusted manually, so when the hydraulic system was finished using and the vehicle was started driving, people forgot to return the set minimum engine speed to the idle speed. There was a danger that the vehicle would start traveling with the rotational speed set to the increased rotational speed when using the hydraulic system.

The present invention aims to eliminate the above-mentioned conventional drawbacks,
When using the hydraulic system, you can set the minimum engine speed as desired, and when you stop using the hydraulic system and switch to driving, the minimum engine speed automatically returns to the idle speed. Our goal is to provide an engine speed control device that provides

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, movable contact 1a of the main switch of the hydraulic system
is connected to power supply 2, fixed contact 1 b (OFF contact)
is connected to the fixed contact 3a (deceleration contact) of the accelerator control switch 3, and the fixed contact 1c (ON contact) is connected to the movable contact 3b of the accelerator control switch 3 via the diode 4. The direction of contact 3b is defined as the forward direction.

The fixed contact 3C (speed increasing contact) of the accelerator control switch 3 is connected to one pole 5a of the motor 5, and is further grounded via the normally open contact 6a of the relay 6, and the other pole 5b of the motor 5 is connected to the relay 7. It is grounded via the normally closed contact 7a.

The fixed contact 3a of the accelerator control switch 3 is connected to the other pole 5b of the motor 5 via the diode 8 and the regular contact 7b of the relay 7, and the diode 8 is connected to the fixed contact 3a.
The direction of the pole 5b of the motor 5 is defined as the forward direction.

The fixed contact 3a of the accelerator control switch 3 is further grounded through a limit switch 9 via a parallel circuit of relays 6 and 7.

The movable contact 3b of the accelerator control switch 3 has a neutral position in which it does not touch either of the fixed contacts 3a, 3C, and is normally in the neutral position.

The motor 5 has the function of moving and adjusting a set minimum rotation speed adjustment member of the engine (not shown), and a limit switch 9 is configured to open when the set minimum rotation speed of the engine drops to idle speed, and the diodes 4 and 8 is a backflow prevention diode.

Next, when using the hydraulic system to explain the operation of the engine speed control device with the above structure, connect the movable contact 1a of the main switch 1 to the fixed contact 1c (ON contact), and set the minimum engine speed. When increasing the speed, the movable contact 3b of the accelerator control switch 3 in the neutral position is connected to the fixed contact 3C (acceleration increasing contact), and when decreasing the speed, the movable contact 3b is connected to the fixed contact 3a (deceleration contact).

When the movable contact 3b in the neutral position is connected to the fixed contact 3C (speed increasing contact) in order to increase the set minimum rotation speed,
Normally closed contact 7 of relay 7 passes from pole 5a to 5b of motor 5
Current flows through a, causing the motor 5 to increase the set minimum rotational speed of the engine.

When the set minimum rotation speed reaches an arbitrary rotation speed and the movable contact 3b is returned to the neutral position, the operation of the motor 5 is stopped and the arbitrary set minimum rotation speed can be maintained.

To reduce the set minimum rotation speed to idle rotation,
The movable contact 3b in the neutral position of the accelerator control switch 3 is connected to the fixed contact 3a (deceleration contact).

When operated as described above, current flows through the relays 6 and 7 and through the limit switch 9, activating the relays 6 and 7, closing the normally open contact 6a of the relay 6, and closing the normally open contact 7 of the relay 7.
b is closed and the normally closed contact 7a is opened. Since the contacts change as described above, the current flows through the diode 8 and the normally open contact 7 of the relay 7.
Flows through b to the remote motor 5 from the pole 5b to the 5a side and via the constant contact 6a of the relay 6, and the motor 5 lowers the set minimum rotational speed of the engine.

When the set minimum rotation speed reaches an arbitrary rotation speed and the movable contact 3b is returned to the neutral position, the operation of the motor 5 is stopped and the arbitrary set minimum rotation speed can be maintained.

Even if the movable contact 3b continues to be connected to the fixed contact 3a (deceleration contact), when the set minimum rotation speed drops to idle rotation, the limit switch 9 opens and stops the excitation of the relays 6 and 7, leaving the relay 6 normally open. The contact 6a and the normally open contact 7b of the relay 7 are opened, and the normally open contact 7a of the relay 7 is closed, interrupting the energization of the motor 5 and maintaining the set minimum rotational speed at idle rotation.

In addition, after using the hydraulic system, if you forget to lower the set minimum rotation speed to the idle speed, the movable contact 1a of the main switch 1 of the hydraulic system remains at a high set minimum rotation speed.
When fixed contact 1b (OFF contact) is set, current flows through one loop 6, 7 through limit switch 9, actuating relays 6, 7, and normally open contact 6a of relay 6 and relay 7.
Closes the normally open contact 7b of the relay 7, and opens the normally closed contact of the relay 7.As the contacts operate as described above, the current flows through the diode 8,
5 from pole 5b to remoter 5 through normally open contact 7b of relay 7.
The flow passes through the normally open contact 6a of the relay 6, and the motor 5 lowers the set minimum rotation speed of the engine. When the set minimum rotation speed drops to idle rotation, the limit switch 9 opens and the relays 6, 7 The normally open contact 6a of the relay 6 and the normally open contact 7a of the relay 7 close, interrupting the energization of the motor 5, and keeping the set minimum rotational speed at idle rotation.

As described above, the engine speed control device of the present invention allows you to manually set the minimum engine speed as high or low as you like, and also automatically sets the engine speed when you finish using the hydraulic system and turn off the main switch. It is possible to reduce the minimum rotation speed to the idle rotation speed, which is a highly safe and practically effective idea.

[Brief explanation of the drawing]

The figure is a wiring diagram showing an embodiment of the present invention. 1: Main switch, 3: Accelerator control switch, 5: Motor, 6, 7: Relay, 9: Limit switch.

Claims (1)

[Scope of utility model registration request] In a vehicle engine speed control device equipped with a hydraulic system using a vehicle running engine as a drive source, a main switch 1 has a movable contact 1a connected to a power source 2, a fixed contact 1b,
The accelerator control switch 3 has a fixed contact 3a connected to the fixed contact 1b, a movable contact 3b connected to the fixed contact IC, and a fixed contact 3C connected to one pole 5a of the motor 5. the other pole 5b of
is grounded via the normally closed contact 7a of the relay 7, and at the same time is connected to the fixed contact 3a via the normally open contact 7b of the relay 7, and the fixed contact 3a is connected to one terminal of the relays 6 and 7, and the relay An engine speed control device characterized in that the other terminals of the terminals 6 and 7 are grounded via a limit switch 9, and the fixed contact 3C is grounded via a regular contact 6a of the relay 6.