JPS6030439Y2 - Work vehicle with engine control device - Google Patents

Description

[Detailed description of the invention] This invention detects and detects the engine rotation speed so that the engine output can always be used to the maximum and work can be performed as efficiently as possible. The present invention relates to a work vehicle such as a combine that is equipped with an engine control device that automatically maintains the engine rotation speed constant via an actuator based on the result and a manual engine rotation speed change operation device.

Generally, this type of work vehicle equipped with an engine control device is configured so that the engine speed can be switched between an automatic control state and a manual control state by turning on and off a switch installed in the power supply circuit of the engine control device. However, in this case, it is easy to forget to switch the engine control device from automatic to manual when moving from working in the field to driving on the road or moving in the field while not working, and such forgetting to switch Therefore, there is a risk that the work speed that the worker intended cannot be achieved, and that the automatic control may perform unexpected speed control.

In view of these circumstances, the present invention has been developed to ensure that the engine is properly controlled during work by the function of the control device, while at the same time ensuring safety and safety at the speed intended by the worker when driving on the road.
The purpose is to ensure good running, and the above-mentioned equipment is equipped with a device that detects whether the working part is activated or not. The engine is characterized in that it is provided with a control stop mechanism that disables the automatic control operation by the engine control device when the engine control device detects the operation.

That is, focusing on the fact that the working section is always switched to the non-operating state when driving on the road or moving in the field while not working, the structure is designed to disable the operation of the engine control device when the working section is in the non-working state. As a result, even if you forget to switch the engine control device to the inactive state when driving on the road shifts from working state to moving in the field in non-working state, the operation of this control device will be disabled. As a result, the manual operating device can be put into operation, making it possible to ensure safe and good running at the speed intended by the operator.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a combine harvester, in which a shelling section 3 is mounted on the upper part of a body frame 2 having a pair of left and right crawler-type traveling devices 1, and in front of these, a pulling device 4A, a clipper-type reaping device 4B, and , a reaping section 4 consisting of a vertical conveying device 40, etc., which gradually changes the reaped husk culm to a sideways posture and conveys and supplies it to the field chain 3A of the dehusking section 3;
has been set up.

FIG. 2 shows the control system of the engine 5.
The engine speed can be adjusted by either an engine control device 1 for automatically controlling the engine speed or a throttle lever 1 as an engine speed change operation device for artificially changing the engine speed. It is structured as follows.

In other words, the throttle lever 1 and the engine 5 are
They are interlocked and connected via an operating actuator 6 constituted by a well-known friction transmission mechanism, etc., and can be operated manually even when the engine control device 1 is in an automatic control state or in a state in which automatic control is released. Configured to allow engine speed adjustment.

The engine control device 1 includes an engine rotation speed setter 11 that can change the target engine rotation speed in multiple stages according to work conditions, and an engine rotation speed setting device 11 that can change the target engine rotation speed in multiple stages according to the working conditions. A rotation detector 12, an operating motor 15 for driving and operating the operating actuator 6, and a control circuit 13 that issues an operating command to the operating motor 15 based on signals from the setting device 11 and detector 12. It is composed of.

The control circuit 13 includes a comparator 14A that compares the engine rotational speed determined by the setting device 11 and the actual engine rotational speed detected by the actual rotational speed detector 9, and calculates the deviation thereof, based on the comparison result. A control signal transmitting mechanism 14B for operating the operating motor 15 in forward or reverse rotation so as to reduce the deviation, and a control signal from the control signal transmitting mechanism 14B to the operating motor 15 may be cut off midway. In a normal automatic control state, as the engine rotational speed fluctuates, the rotational speed approaches the set speed.
The operating motor 15 is driven in forward or reverse rotation, and accordingly, the operating motor 15 adjusts the rotational speed of the engine 5 via the operating actuator 6.

Switching between the manual control state using the slot lever base and the automatic control state using the engine control device 1 is achieved by switching between the automatic control state and the automatic control state by connecting the engine control device 1 to a power supply midway through the power supply circuit of the engine control device 1. , by providing a manual/automatic switching mechanism 16 consisting of a switch, etc., for disconnecting the engine control device 1 from the power source and switching to a state in which automatic control is canceled, that is, a manual control state. - Performed by operating the automatic switching mechanism 16.

As mentioned above, with a work vehicle equipped with the manual/automatic switching mechanism 16, there will be no problem as long as you do not forget to switch between manual and automatic, but if you forget,
Even if an attempt is made to obtain a desired traveling speed by manual operation, the speed control cannot be performed as expected, which is extremely dangerous.

In order to avoid this, a well-known detection device 9' is used to detect which side the manual/automatic switching mechanism 16 is switched to, and to detect whether the shelling section 3 as a working section is activated or not. A rain detection device 9 is provided, and a rain detection device 9,
A control stop mechanism is constituted by an AND circuit 10 which inputs a detection signal to the control circuit 13 of the engine control device 1 based on the detection result of 9'.

That is, the detection device 9' detects the switching of the manual/automatic switching mechanism 16 to the automatic control state, and another detection device 9'
When detecting the non-operation of the shelling section 3, the AND circuit 10 inputs a detection signal to the signal intermittent mechanism 14C of the control circuit 13, and cuts off the operation command from the control circuit 13 to the operation motor 15, thereby allowing manual operation. The configuration is such that automatic control by the engine control device 7 is disabled regardless of whether the automatic switching mechanism 16 is switched to the automatic control state.

FIG. 3 shows an example of the display section of the engine rotation speed setting device 11, and the setting change operation knob IIA is moved to the engine rotation speed position N□ suitable for beer barley, seed rice, standard rice, and wheat, respectively.
, N2. N3. It is configured so that it can be freely switched to N4.

[Brief explanation of the drawing]

The drawings show an embodiment of a working vehicle with an engine control device according to the present invention, in which Fig. 1 is an overall side view of the combine harvester, Fig. 2 is a block diagram showing the engine control system, and Fig. 3 is an enlarged view of the main parts. It is. 3...Working part, 5...Engine, 6.
... Actuator, 7 ... Engine control device, 9 ... Engine speed change operation device, 9 ... Detection device, 0 ... Control stop mechanism.

Claims (1)

[Scope of utility model registration request] Work that includes an engine control device 7 and a manual engine rotation speed change operation device 1 that detects the engine 5 rotation speed and automatically maintains the engine rotation speed constant via an actuator 6 based on the detection result. A control stop mechanism 10 that disables automatic control operation by the engine control device 1 when the device 9 detects the operation/non-operation of the working part 3 is installed in the vehicle. A work vehicle equipped with an engine control device.