JPH0534367Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a safe travel control device for a working traveling machine such as a combine harvester or a tractor.

[Problems to be solved by the prior art and the invention] Generally, among this type of work traveling machine, there is one that is configured to move and change speed in a stepless manner, for example, by operating a gear shift lever. In conventional systems, a lever zone detecting means such as a rotary switch detects that the gear shift lever is set from a neutral zone to a forward/reverse travel zone, and then changes the travel gear. As a result, if the lever zone detection means is malfunctioning or poorly adjusted, there is a risk that the control system will malfunction, such as the vehicle driving even though the gear shift lever is set to the neutral position. The problem is that it is extremely dangerous and lacks reliability.

[Means for Solving the Problems] In view of the above-mentioned actual circumstances, the present invention was devised for the purpose of providing a safe travel control device for a work traveling aircraft that can eliminate these problems. , lever zone detection means for detecting whether the gear shift lever is located in the neutral zone or in the driving zone, and lever displacement amount detection means for detecting how far the gear shift lever has been displaced from the neutral position to the high speed side. In a working traveling aircraft, the traveling control mechanism is provided with a traveling control mechanism that receives signals from the lever zone detecting means and outputs control commands corresponding to the traveling transmission mechanism based on these signals. A safety system that determines that it is safe only when the signal from the lever displacement amount detection means is shifted to the high speed side and outputs a corresponding travel control command, and outputs a stop control command if not. It is characterized in that it is provided with a detection means.

With this configuration, the present invention improves safety by issuing a travel control command only when both the lever zone detection means and the lever displacement amount detection means detect that the vehicle is in a travel state. It has been made achievable.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a traveling body of a combine harvester, and a stepless forward/reverse speed change lever 2 is provided on the side of the driver's seat of the traveling body 1. The boss portion 2a of the speed change lever 2 is equipped with a lever displacement amount detection sensor 3 consisting of a potentiometer for detecting the amount of displacement (angle) of the swinging operation of the lever, and the speed change lever 2 is in the forward position F, neutral position N, A lever zone detection switch 4 consisting of a rotary switch is used to detect which zone the reverse position R is in.
is provided. Here, the lever zone detection switch 4 of the embodiment is a forward zone F of the gear shift lever 2.
and switch 4, which is turned on in reverse zone R.
f, 4r.

Reference numeral 5 denotes a control section formed using a microcomputer. The lever displacement amount detection sensor 3 and the lever zone detection switches 4, 4f, 4r are connected to the input side of the control section 5. Also connected to the input side are sensors and switches such as side clutch detection switches 6R, 6L for detecting whether the left and right side clutch brake levers have been operated, limit switches 7U, 7D for detecting when the pre-processing section has reached its upper or lower limit position, and a continuously variable transmission detection sensor 8 for detecting the speed change state of a continuously variable transmission mechanism using a belt transmission.

On the other hand, on the output side of the control section 5, solenoids 9a and 9 are provided for switching the cylinder 9 for raising and lowering the pretreatment section.
b. Solenoids 10a, 11a for switching and operating the cylinders 10, 11 for switching the left and right side clutches and handbrakes; solenoids 12a, 13a for switching the cylinders 12, 13 for the forward/reverse clutch; continuously variable speed increase/deceleration operation; Solenoid 1 for switching the expansion and contraction of the cylinder 14
4a, 14b, etc., and outputs corresponding control commands based on input signals as described later.

Next, a control procedure based on the detection signals of the lever displacement amount detection sensor 3 and the lever zone detection switch 4 will be explained based on the flowchart shown in FIG. First, the system starts, and when the forward/reverse control routine is set and the control unit is initialized, the detection value A of the lever displacement detection sensor 3 is set in the neutral zone N (from RV ₁ to FV ₁₎ . while)
It is determined whether or not the vehicle is located in the neutral zone N, and if the determination is NO, a stop control command is issued. When a YES determination is made, it is further determined which shift zone region the lever zone detection switch 4 is in, and if it is in the neutral position N, a stop command is issued, and if it is in the forward position F, a stop command is issued. When the forward control command is for the reverse position R, a reverse control command is issued, and travel control is thereby performed. It should be noted that the continuously variable traveling speed change is controlled by feeding back the detection value of the continuously variable speed detection sensor 8 to the detection value of the lever displacement amount detection sensor 3, as is conventional.

In the embodiment of the present invention configured as described above, the stepless forward/reverse traveling shift is performed by lever operation of the shift lever 2, and the travel control command based on this is transmitted by the lever displacement amount detection sensor. 3 is not in the neutral zone N and the lever zone detection switch 4 receives a signal that it is in the forward or reverse zone. Therefore, the forward/reverse travel shift must not be performed with the lever zone detection switch 4 not in the neutral zone N and with the lever displacement amount detection sensor 3 set to either the forward or forward travel shift position. Therefore, there is a danger that if the lever displacement amount detection sensor 3 or lever zone detection switch 4 malfunctions and normal signals are not output, a travel control command is output by mistake and the aircraft suddenly starts traveling. can be reliably avoided, resulting in a significant improvement in safety.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, but for example, the lever zone detection means may be used as long as it determines whether or not the gear shift lever is in the neutral zone. , it can also be used as a neutral switch that turns ON when the vehicle is set in the neutral zone. An example flowchart in that case is shown in FIG. It can be carried out.

[Operations and Effects] In summary, the present invention is constructed as described above, and when the shift lever is used to change the traveling speed, the lever operation can be used to detect either the lever displacement amount detection means or the lever zone detection means. A travel control command is output only when the vehicle is not in the neutral zone, and in other states, a stop control command is issued and the vehicle does not travel. As a result, the risk of unexpected running when either the lever displacement amount detection means or the lever zone detection means is malfunctioning or maladjusted is reliably avoided, resulting in high reliability. This means that it can be made extremely safe.

[Brief explanation of the drawing]

The drawings show an embodiment of the safe travel control device for a work traveling machine according to the present invention, in which FIG. 1 is a plan view of a combine harvester, and FIG. 2 is a block diagram of the control system including the gear shift lever section. Circuit diagram, Fig. 3 is a hydraulic circuit diagram, Fig. 4 is a flowchart, Fig. 5 is a graph showing the relationship between lever position and lever displacement detection value, and Fig. 6 is a control showing the second embodiment. FIG. 3 is a flowchart of the circuit. In the figure, 2 is a gear shift lever, 3 is a lever displacement detection sensor, 4 is a lever zone detection switch, and 5 is a control section.

Claims (1)

[Scope of utility model registration request] lever zone detection means for detecting whether the gear shift lever is located in the neutral zone or the driving zone; and lever displacement amount detection means for detecting how far the gear shift lever has been displaced from the neutral position to the high speed side. In a working traveling aircraft that is provided with a travel control mechanism that inputs signals and outputs control commands corresponding to the travel transmission mechanism based on the signals, the travel control mechanism receives signals from the lever zone detection means when the signal from the lever zone detection means is detected in the neutral zone. and the signal from the lever displacement amount detection means is shifted to the high speed side, and outputs a corresponding travel control command by determining that it is safe, and otherwise outputs a stop control command. A safe travel control device for a working traveling aircraft, characterized in that a means is provided.