JPH0345555Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reaping and harvesting machine, and more particularly, to a reaping and harvesting machine equipped with a sensor that detects the traveling speed in order to automatically control the traveling speed.

In order to maintain a constant threshing load, conventional reaping and harvesting machines perform automatic control to keep the reaping traveling speed constant by comparing the vehicle speed set with the speed change control lever and the actual vehicle speed detected by the sensor. was.

In the conventional reaping harvester, the sensor signal as a control parameter for automatically controlling the reaping travel speed is input to the control device regardless of whether it is normal or abnormal, so there is a risk of a runaway accident. That is, when a signal of 0 speed is input from the sensor to the control device even though the machine is running, the control device outputs a speed increase signal to maintain the reaping machine at the set vehicle speed, There was a problem where endless speed increase control was executed.

The present invention is intended to solve the above-mentioned problems of the prior art, and aims to provide a reaping and harvesting machine equipped with an abnormality check function in the vehicle speed detection system.

In order to achieve the above object, the reaping harvester of the present invention is provided with means for detecting the neutral state of the operating lever for controlling the traveling speed, and means for detecting whether the engine is in operation or non-operating. When it is detected that the vehicle is in a non-neutral state and that the engine is operating, and the speed detected by the speed detection sensor is 0,
This system is provided with means for activating an alarm device to notify the occurrence of an abnormality in the vehicle speed detection system.

Therefore, according to the present invention, the following effects can be obtained.

(a) If the travel speed detection sensor indicates a speed of 0 even though the operating speed control lever is in a gear shifting state and the engine is operating, the operator is notified of the abnormality and the abnormality is detected as in the prior art. This makes it possible to prevent vehicle speed control from occurring.

(b) Since the detection speed of 0 by the speed detection sensor is specified as a condition for an abnormality, runaway of the reaping harvester can be notified in advance even though the number of conditions is small.
That is, when the speed detection result is other than 0, it is recognized that the vehicle speed detection system is operating temporarily, and it is unlikely that the vehicle will immediately develop into a runaway. On the other hand, detection of zero speed while the vehicle is running is a clear abnormality and will inevitably lead to a runaway due to endless speed increase control. Since the present invention specifies the detection of zero speed as an abnormal condition as described above, it has the effect of being able to notify the occurrence of the most dangerous runaway condition at an early stage in advance with a small number of conditions, in other words, a simple configuration. .

Incidentally, an abnormality in the vehicle speed detection system when the speed detection result is other than 0 can be reported by means of detecting a large difference in the detected vehicle speed with respect to the target vehicle speed, as will be explained in the embodiment described later. When implemented in combination, the occurrence of an abnormality can be more completely notified by providing early advance notification of the most dangerous state due to the speed 0 and notification of an abnormality that is likely to develop into a runaway.

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

As shown in FIG. 1, an engine E, a control section 3, and a threshing device 4 are mounted on a fuselage 1 equipped with a pair of left and right crawler traveling devices 2, 2.
A reaping section 5 is provided at the front of the machine body 1 so as to be movable up and down, thereby forming a combine harvester.

A lever provided on the drive shaft portion of the crawler traveling device 2 is set so that the travel speed is set by a vehicle speed control lever 6 provided on the control portion 3, or a predetermined travel speed is set in advance. The actual running speed is controlled based on the speed detection result by the speed detection sensor 7, which detects the vehicle speed by detecting the rotational speed of the drive shaft.

Below, along with automatic control of traveling speed,
A control system that checks the state of the speed control lever 6 and the signal from the speed detection sensor 7 will be explained.

As shown in FIG. 2, the control system uses a control device 8, the main part of which is composed of a microcomputer, to control the speed control lever 6 in its neutral state, maximum forward speed position, and reverse position. Limit switch S ₀ that detects the position
Signals from S ₁ and S ₂ , a signal from the vehicle speed sensor 7, and a signal from the rotation speed detection sensor 9 that detects the rotation speed of the engine E are inputted,
Based on these signals, it is possible to determine whether there is an abnormality in the vehicle speed detection system.
The system is configured to check for abnormality and to drive a motor 11 that operates the position of the speed control lever 6 which is linked to the continuously variable transmission 10 to control the output of the engine E, and when an abnormality is detected. An alarm device 12 such as a lamp or a buzzer is activated to notify the worker of the occurrence of an abnormality.

That is, when the limit switch _S0 that detects the neutral state of the operating lever 6 is OFF and the output signal of the rotation speed detection sensor 9 is in a state corresponding to that the engine E is in operation,
When the detection signal of the vehicle speed sensor 7 is in a state corresponding to the speed O, it is determined that an abnormality has occurred in the vehicle speed control system, and the alarm device 12 is activated to notify the occurrence of the abnormality.

Furthermore, if the limit switch _S1 is ON and there is an output signal from the rotation speed detection sensor 9, and the vehicle speed detected by the vehicle speed sensor 7 is significantly different from the target vehicle speed corresponding to the ON position of the limit switch _S1 , Similarly to the above, the system is configured to operate the alarm device 12 on the assumption that an abnormality has occurred in the vehicle speed detection system.

Furthermore, when the limit switch S ₁ is ON and there is an output signal from the rotation speed detection sensor 9, it becomes necessary to perform a deceleration operation to control other work devices mounted on the machine body 1. In order to automatically decelerate the vehicle, even if the limit switch S1 is not turned off even though the motor ₁₁ is operated, the alarm device 12 is activated as an abnormality.

In this embodiment, in order to start the engine E when the limit switch S ₀ is in the OFF state, when the main key SW is turned on, the limit switch S ₀ is automatically set to the ON position, that is, when the vehicle speed ο is reached. The motor 11 is driven to return the operating lever 6 and the transmission 10 to the corresponding neutral position, and the alarm device 12 is
The system is configured to activate the system to notify the occurrence of an abnormality due to an erroneous operation.

Further, FIG. 3 is a flowchart showing the operation of the control device 8 described above.

[Brief explanation of drawings]

The drawings show an embodiment of the reaping and harvesting machine according to the present invention, FIG. 1 is a front side view of the combine, FIG. 2 is a block diagram of the control system, and FIG. 3 is a flowchart showing the operation of the control device. It is. 6...Speed control lever, 7...Speed detection sensor, 12...Alarm device, E...Engine, S ₀ ...
Lever neutral state detection means.

Claims (1)

[Scope of utility model registration request] The reaping harvester is equipped with a sensor 7 for detecting the running speed in order to automatically control the running speed, and is provided with means _S0 for detecting the neutral state of the operating lever 6 for controlling the running speed, and also has a means S0 for detecting the neutral state of the operating lever 6 for controlling the running speed. - A means for detecting non-operation is provided, and it is detected that the operating lever 6 is in a non-neutral state, and
It is detected that the engine E is in operation, and the speed detected by the speed detection sensor 7 is 0.
If so, the reaping/harvesting machine is provided with means for activating the alarm device 12 to notify the occurrence of an abnormality in the vehicle speed detection system.